/* Tracepoint code for remote server for GDB.
- Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 2009-2014 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
+#include "tracepoint.h"
+#include "gdbthread.h"
+#include "agent.h"
+#include "rsp-low.h"
+
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
-
-static void trace_debug_1 (const char *, ...) ATTR_FORMAT (printf, 1, 2);
+#include <stddef.h>
+#include <inttypes.h>
+#include <stdint.h>
+
+#include "ax.h"
+#include "tdesc.h"
+
+#define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */
+
+/* This file is built for both GDBserver, and the in-process
+ agent (IPA), a shared library that includes a tracing agent that is
+ loaded by the inferior to support fast tracepoints. Fast
+ tracepoints (or more accurately, jump based tracepoints) are
+ implemented by patching the tracepoint location with a jump into a
+ small trampoline function whose job is to save the register state,
+ call the in-process tracing agent, and then execute the original
+ instruction that was under the tracepoint jump (possibly adjusted,
+ if PC-relative, or some such).
+
+ The current synchronization design is pull based. That means,
+ GDBserver does most of the work, by peeking/poking at the inferior
+ agent's memory directly for downloading tracepoint and associated
+ objects, and for uploading trace frames. Whenever the IPA needs
+ something from GDBserver (trace buffer is full, tracing stopped for
+ some reason, etc.) the IPA calls a corresponding hook function
+ where GDBserver has placed a breakpoint.
+
+ Each of the agents has its own trace buffer. When browsing the
+ trace frames built from slow and fast tracepoints from GDB (tfind
+ mode), there's no guarantee the user is seeing the trace frames in
+ strict chronological creation order, although, GDBserver tries to
+ keep the order relatively reasonable, by syncing the trace buffers
+ at appropriate times.
+
+*/
+
+#ifdef IN_PROCESS_AGENT
+
+static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
static void
-trace_debug_1 (const char *fmt, ...)
+trace_vdebug (const char *fmt, ...)
{
char buf[1024];
va_list ap;
va_start (ap, fmt);
vsprintf (buf, fmt, ap);
- fprintf (stderr, "gdbserver/tracepoint: %s\n", buf);
+ fprintf (stderr, PROG "/tracepoint: %s\n", buf);
va_end (ap);
}
-#define trace_debug(FMT, args...) \
+#define trace_debug_1(level, fmt, args...) \
+ do { \
+ if (level <= debug_threads) \
+ trace_vdebug ((fmt), ##args); \
+ } while (0)
+
+#else
+
+#define trace_debug_1(level, fmt, args...) \
do { \
- if (debug_threads) \
- trace_debug_1 ((FMT), ##args); \
+ if (level <= debug_threads) \
+ { \
+ debug_printf ((fmt), ##args); \
+ debug_printf ("\n"); \
+ } \
} while (0)
+#endif
+
+#define trace_debug(FMT, args...) \
+ trace_debug_1 (1, FMT, ##args)
+
+#if defined(__GNUC__)
+# define ATTR_USED __attribute__((used))
+# define ATTR_NOINLINE __attribute__((noinline))
+# define ATTR_CONSTRUCTOR __attribute__ ((constructor))
+#else
+# define ATTR_USED
+# define ATTR_NOINLINE
+# define ATTR_CONSTRUCTOR
+#endif
+
+/* Make sure the functions the IPA needs to export (symbols GDBserver
+ needs to query GDB about) are exported. */
+
+#ifdef IN_PROCESS_AGENT
+# if defined _WIN32 || defined __CYGWIN__
+# define IP_AGENT_EXPORT __declspec(dllexport) ATTR_USED
+# else
+# if __GNUC__ >= 4
+# define IP_AGENT_EXPORT \
+ __attribute__ ((visibility("default"))) ATTR_USED
+# else
+# define IP_AGENT_EXPORT ATTR_USED
+# endif
+# endif
+#else
+# define IP_AGENT_EXPORT
+#endif
+
+/* Prefix exported symbols, for good citizenship. All the symbols
+ that need exporting are defined in this module. */
+#ifdef IN_PROCESS_AGENT
+# define gdb_tp_heap_buffer gdb_agent_gdb_tp_heap_buffer
+# define gdb_jump_pad_buffer gdb_agent_gdb_jump_pad_buffer
+# define gdb_jump_pad_buffer_end gdb_agent_gdb_jump_pad_buffer_end
+# define gdb_trampoline_buffer gdb_agent_gdb_trampoline_buffer
+# define gdb_trampoline_buffer_end gdb_agent_gdb_trampoline_buffer_end
+# define gdb_trampoline_buffer_error gdb_agent_gdb_trampoline_buffer_error
+# define collecting gdb_agent_collecting
+# define gdb_collect gdb_agent_gdb_collect
+# define stop_tracing gdb_agent_stop_tracing
+# define flush_trace_buffer gdb_agent_flush_trace_buffer
+# define about_to_request_buffer_space gdb_agent_about_to_request_buffer_space
+# define trace_buffer_is_full gdb_agent_trace_buffer_is_full
+# define stopping_tracepoint gdb_agent_stopping_tracepoint
+# define expr_eval_result gdb_agent_expr_eval_result
+# define error_tracepoint gdb_agent_error_tracepoint
+# define tracepoints gdb_agent_tracepoints
+# define tracing gdb_agent_tracing
+# define trace_buffer_ctrl gdb_agent_trace_buffer_ctrl
+# define trace_buffer_ctrl_curr gdb_agent_trace_buffer_ctrl_curr
+# define trace_buffer_lo gdb_agent_trace_buffer_lo
+# define trace_buffer_hi gdb_agent_trace_buffer_hi
+# define traceframe_read_count gdb_agent_traceframe_read_count
+# define traceframe_write_count gdb_agent_traceframe_write_count
+# define traceframes_created gdb_agent_traceframes_created
+# define trace_state_variables gdb_agent_trace_state_variables
+# define get_raw_reg gdb_agent_get_raw_reg
+# define get_trace_state_variable_value \
+ gdb_agent_get_trace_state_variable_value
+# define set_trace_state_variable_value \
+ gdb_agent_set_trace_state_variable_value
+# define ust_loaded gdb_agent_ust_loaded
+# define helper_thread_id gdb_agent_helper_thread_id
+# define cmd_buf gdb_agent_cmd_buf
+#endif
+
+#ifndef IN_PROCESS_AGENT
+
+/* Addresses of in-process agent's symbols GDBserver cares about. */
+
+struct ipa_sym_addresses
+{
+ CORE_ADDR addr_gdb_tp_heap_buffer;
+ CORE_ADDR addr_gdb_jump_pad_buffer;
+ CORE_ADDR addr_gdb_jump_pad_buffer_end;
+ CORE_ADDR addr_gdb_trampoline_buffer;
+ CORE_ADDR addr_gdb_trampoline_buffer_end;
+ CORE_ADDR addr_gdb_trampoline_buffer_error;
+ CORE_ADDR addr_collecting;
+ CORE_ADDR addr_gdb_collect;
+ CORE_ADDR addr_stop_tracing;
+ CORE_ADDR addr_flush_trace_buffer;
+ CORE_ADDR addr_about_to_request_buffer_space;
+ CORE_ADDR addr_trace_buffer_is_full;
+ CORE_ADDR addr_stopping_tracepoint;
+ CORE_ADDR addr_expr_eval_result;
+ CORE_ADDR addr_error_tracepoint;
+ CORE_ADDR addr_tracepoints;
+ CORE_ADDR addr_tracing;
+ CORE_ADDR addr_trace_buffer_ctrl;
+ CORE_ADDR addr_trace_buffer_ctrl_curr;
+ CORE_ADDR addr_trace_buffer_lo;
+ CORE_ADDR addr_trace_buffer_hi;
+ CORE_ADDR addr_traceframe_read_count;
+ CORE_ADDR addr_traceframe_write_count;
+ CORE_ADDR addr_traceframes_created;
+ CORE_ADDR addr_trace_state_variables;
+ CORE_ADDR addr_get_raw_reg;
+ CORE_ADDR addr_get_trace_state_variable_value;
+ CORE_ADDR addr_set_trace_state_variable_value;
+ CORE_ADDR addr_ust_loaded;
+};
+
+static struct
+{
+ const char *name;
+ int offset;
+ int required;
+} symbol_list[] = {
+ IPA_SYM(gdb_tp_heap_buffer),
+ IPA_SYM(gdb_jump_pad_buffer),
+ IPA_SYM(gdb_jump_pad_buffer_end),
+ IPA_SYM(gdb_trampoline_buffer),
+ IPA_SYM(gdb_trampoline_buffer_end),
+ IPA_SYM(gdb_trampoline_buffer_error),
+ IPA_SYM(collecting),
+ IPA_SYM(gdb_collect),
+ IPA_SYM(stop_tracing),
+ IPA_SYM(flush_trace_buffer),
+ IPA_SYM(about_to_request_buffer_space),
+ IPA_SYM(trace_buffer_is_full),
+ IPA_SYM(stopping_tracepoint),
+ IPA_SYM(expr_eval_result),
+ IPA_SYM(error_tracepoint),
+ IPA_SYM(tracepoints),
+ IPA_SYM(tracing),
+ IPA_SYM(trace_buffer_ctrl),
+ IPA_SYM(trace_buffer_ctrl_curr),
+ IPA_SYM(trace_buffer_lo),
+ IPA_SYM(trace_buffer_hi),
+ IPA_SYM(traceframe_read_count),
+ IPA_SYM(traceframe_write_count),
+ IPA_SYM(traceframes_created),
+ IPA_SYM(trace_state_variables),
+ IPA_SYM(get_raw_reg),
+ IPA_SYM(get_trace_state_variable_value),
+ IPA_SYM(set_trace_state_variable_value),
+ IPA_SYM(ust_loaded),
+};
+
+static struct ipa_sym_addresses ipa_sym_addrs;
+
+static int read_inferior_integer (CORE_ADDR symaddr, int *val);
+
+/* Returns true if both the in-process agent library and the static
+ tracepoints libraries are loaded in the inferior, and agent has
+ capability on static tracepoints. */
+
+static int
+in_process_agent_supports_ust (void)
+{
+ int loaded = 0;
+
+ if (!agent_loaded_p ())
+ {
+ warning ("In-process agent not loaded");
+ return 0;
+ }
+
+ if (agent_capability_check (AGENT_CAPA_STATIC_TRACE))
+ {
+ /* Agent understands static tracepoint, then check whether UST is in
+ fact loaded in the inferior. */
+ if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded))
+ {
+ warning ("Error reading ust_loaded in lib");
+ return 0;
+ }
+
+ return loaded;
+ }
+ else
+ return 0;
+}
+
+static void
+write_e_ipa_not_loaded (char *buffer)
+{
+ sprintf (buffer,
+ "E.In-process agent library not loaded in process. "
+ "Fast and static tracepoints unavailable.");
+}
+
+/* Write an error to BUFFER indicating that UST isn't loaded in the
+ inferior. */
+
+static void
+write_e_ust_not_loaded (char *buffer)
+{
+#ifdef HAVE_UST
+ sprintf (buffer,
+ "E.UST library not loaded in process. "
+ "Static tracepoints unavailable.");
+#else
+ sprintf (buffer, "E.GDBserver was built without static tracepoints support");
+#endif
+}
+
+/* If the in-process agent library isn't loaded in the inferior, write
+ an error to BUFFER, and return 1. Otherwise, return 0. */
+
+static int
+maybe_write_ipa_not_loaded (char *buffer)
+{
+ if (!agent_loaded_p ())
+ {
+ write_e_ipa_not_loaded (buffer);
+ return 1;
+ }
+ return 0;
+}
+
+/* If the in-process agent library and the ust (static tracepoints)
+ library aren't loaded in the inferior, write an error to BUFFER,
+ and return 1. Otherwise, return 0. */
+
+static int
+maybe_write_ipa_ust_not_loaded (char *buffer)
+{
+ if (!agent_loaded_p ())
+ {
+ write_e_ipa_not_loaded (buffer);
+ return 1;
+ }
+ else if (!in_process_agent_supports_ust ())
+ {
+ write_e_ust_not_loaded (buffer);
+ return 1;
+ }
+ return 0;
+}
+
+/* Cache all future symbols that the tracepoints module might request.
+ We can not request symbols at arbitrary states in the remote
+ protocol, only when the client tells us that new symbols are
+ available. So when we load the in-process library, make sure to
+ check the entire list. */
+
+void
+tracepoint_look_up_symbols (void)
+{
+ int i;
+
+ if (agent_loaded_p ())
+ return;
+
+ for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++)
+ {
+ CORE_ADDR *addrp =
+ (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset);
+
+ if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0)
+ {
+ if (debug_threads)
+ debug_printf ("symbol `%s' not found\n", symbol_list[i].name);
+ return;
+ }
+ }
+
+ agent_look_up_symbols (NULL);
+}
+
+#endif
+
+/* GDBserver places a breakpoint on the IPA's version (which is a nop)
+ of the "stop_tracing" function. When this breakpoint is hit,
+ tracing stopped in the IPA for some reason. E.g., due to
+ tracepoint reaching the pass count, hitting conditional expression
+ evaluation error, etc.
+
+ The IPA's trace buffer is never in circular tracing mode: instead,
+ GDBserver's is, and whenever the in-process buffer fills, it calls
+ "flush_trace_buffer", which triggers an internal breakpoint.
+ GDBserver reacts to this breakpoint by pulling the meanwhile
+ collected data. Old frames discarding is always handled on the
+ GDBserver side. */
+
+#ifdef IN_PROCESS_AGENT
+int
+read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
+{
+ memcpy (myaddr, (void *) (uintptr_t) memaddr, len);
+ return 0;
+}
+
+/* Call this in the functions where GDBserver places a breakpoint, so
+ that the compiler doesn't try to be clever and skip calling the
+ function at all. This is necessary, even if we tell the compiler
+ to not inline said functions. */
+
+#if defined(__GNUC__)
+# define UNKNOWN_SIDE_EFFECTS() asm ("")
+#else
+# define UNKNOWN_SIDE_EFFECTS() do {} while (0)
+#endif
+
+IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE
+stop_tracing (void)
+{
+ /* GDBserver places breakpoint here. */
+ UNKNOWN_SIDE_EFFECTS();
+}
+
+IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE
+flush_trace_buffer (void)
+{
+ /* GDBserver places breakpoint here. */
+ UNKNOWN_SIDE_EFFECTS();
+}
+
+#endif
+
+#ifndef IN_PROCESS_AGENT
static int
tracepoint_handler (CORE_ADDR address)
{
return 0;
}
-/* This enum must exactly match what is documented in
- gdb/doc/agentexpr.texi, including all the numerical values. */
+/* Breakpoint at "stop_tracing" in the inferior lib. */
+struct breakpoint *stop_tracing_bkpt;
+static int stop_tracing_handler (CORE_ADDR);
-enum gdb_agent_op
- {
- gdb_agent_op_float = 0x01,
- gdb_agent_op_add = 0x02,
- gdb_agent_op_sub = 0x03,
- gdb_agent_op_mul = 0x04,
- gdb_agent_op_div_signed = 0x05,
- gdb_agent_op_div_unsigned = 0x06,
- gdb_agent_op_rem_signed = 0x07,
- gdb_agent_op_rem_unsigned = 0x08,
- gdb_agent_op_lsh = 0x09,
- gdb_agent_op_rsh_signed = 0x0a,
- gdb_agent_op_rsh_unsigned = 0x0b,
- gdb_agent_op_trace = 0x0c,
- gdb_agent_op_trace_quick = 0x0d,
- gdb_agent_op_log_not = 0x0e,
- gdb_agent_op_bit_and = 0x0f,
- gdb_agent_op_bit_or = 0x10,
- gdb_agent_op_bit_xor = 0x11,
- gdb_agent_op_bit_not = 0x12,
- gdb_agent_op_equal = 0x13,
- gdb_agent_op_less_signed = 0x14,
- gdb_agent_op_less_unsigned = 0x15,
- gdb_agent_op_ext = 0x16,
- gdb_agent_op_ref8 = 0x17,
- gdb_agent_op_ref16 = 0x18,
- gdb_agent_op_ref32 = 0x19,
- gdb_agent_op_ref64 = 0x1a,
- gdb_agent_op_ref_float = 0x1b,
- gdb_agent_op_ref_double = 0x1c,
- gdb_agent_op_ref_long_double = 0x1d,
- gdb_agent_op_l_to_d = 0x1e,
- gdb_agent_op_d_to_l = 0x1f,
- gdb_agent_op_if_goto = 0x20,
- gdb_agent_op_goto = 0x21,
- gdb_agent_op_const8 = 0x22,
- gdb_agent_op_const16 = 0x23,
- gdb_agent_op_const32 = 0x24,
- gdb_agent_op_const64 = 0x25,
- gdb_agent_op_reg = 0x26,
- gdb_agent_op_end = 0x27,
- gdb_agent_op_dup = 0x28,
- gdb_agent_op_pop = 0x29,
- gdb_agent_op_zero_ext = 0x2a,
- gdb_agent_op_swap = 0x2b,
- gdb_agent_op_getv = 0x2c,
- gdb_agent_op_setv = 0x2d,
- gdb_agent_op_tracev = 0x2e,
- gdb_agent_op_trace16 = 0x30,
- gdb_agent_op_last
- };
+/* Breakpoint at "flush_trace_buffer" in the inferior lib. */
+struct breakpoint *flush_trace_buffer_bkpt;
+static int flush_trace_buffer_handler (CORE_ADDR);
-static const char *gdb_agent_op_names [gdb_agent_op_last] =
- {
- "?undef?",
- "float",
- "add",
- "sub",
- "mul",
- "div_signed",
- "div_unsigned",
- "rem_signed",
- "rem_unsigned",
- "lsh",
- "rsh_signed",
- "rsh_unsigned",
- "trace",
- "trace_quick",
- "log_not",
- "bit_and",
- "bit_or",
- "bit_xor",
- "bit_not",
- "equal",
- "less_signed",
- "less_unsigned",
- "ext",
- "ref8",
- "ref16",
- "ref32",
- "ref64",
- "ref_float",
- "ref_double",
- "ref_long_double",
- "l_to_d",
- "d_to_l",
- "if_goto",
- "goto",
- "const8",
- "const16",
- "const32",
- "const64",
- "reg",
- "end",
- "dup",
- "pop",
- "zero_ext",
- "swap",
- "getv",
- "setv",
- "tracev",
- "?undef?",
- "trace16",
- };
+static void download_trace_state_variables (void);
+static void upload_fast_traceframes (void);
+
+static int run_inferior_command (char *cmd, int len);
+
+static int
+read_inferior_integer (CORE_ADDR symaddr, int *val)
+{
+ return read_inferior_memory (symaddr, (unsigned char *) val,
+ sizeof (*val));
+}
+
+struct tracepoint;
+static int tracepoint_send_agent (struct tracepoint *tpoint);
+
+static int
+read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val)
+{
+ return read_inferior_memory (symaddr, (unsigned char *) val,
+ sizeof (*val));
+}
+
+static int
+read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val)
+{
+ void *pval = (void *) (uintptr_t) val;
+ int ret;
+
+ ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval));
+ *val = (uintptr_t) pval;
+ return ret;
+}
+
+static int
+write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val)
+{
+ void *pval = (void *) (uintptr_t) val;
+ return write_inferior_memory (symaddr,
+ (unsigned char *) &pval, sizeof (pval));
+}
+
+static int
+write_inferior_integer (CORE_ADDR symaddr, int val)
+{
+ return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val));
+}
+
+static int
+write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val)
+{
+ return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val));
+}
+
+static CORE_ADDR target_malloc (ULONGEST size);
+static int write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr);
+
+#define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \
+ do { \
+ memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \
+ BUF += sizeof ((OBJ)->FIELD); \
+ } while (0)
+
+#endif
+
+/* Operations on various types of tracepoint actions. */
-struct agent_expr
+struct tracepoint_action;
+
+struct tracepoint_action_ops
{
- int length;
+ /* Download tracepoint action ACTION to IPA. Return the address of action
+ in IPA/inferior. */
+ CORE_ADDR (*download) (const struct tracepoint_action *action);
- unsigned char *bytes;
+ /* Send ACTION to agent via command buffer started from BUFFER. Return
+ updated head of command buffer. */
+ char* (*send) (char *buffer, const struct tracepoint_action *action);
};
/* Base action. Concrete actions inherit this. */
struct tracepoint_action
{
+#ifndef IN_PROCESS_AGENT
+ const struct tracepoint_action_ops *ops;
+#endif
char type;
};
ULONGEST addr;
ULONGEST len;
- int basereg;
+ int32_t basereg;
};
/* An 'R' (collect registers) action. */
struct tracepoint_action base;
};
+#ifndef IN_PROCESS_AGENT
+static CORE_ADDR
+m_tracepoint_action_download (const struct tracepoint_action *action)
+{
+ int size_in_ipa = (sizeof (struct collect_memory_action)
+ - offsetof (struct tracepoint_action, type));
+ CORE_ADDR ipa_action = target_malloc (size_in_ipa);
+
+ write_inferior_memory (ipa_action, (unsigned char *) &action->type,
+ size_in_ipa);
+
+ return ipa_action;
+}
+static char *
+m_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
+{
+ struct collect_memory_action *maction
+ = (struct collect_memory_action *) action;
+
+ COPY_FIELD_TO_BUF (buffer, maction, addr);
+ COPY_FIELD_TO_BUF (buffer, maction, len);
+ COPY_FIELD_TO_BUF (buffer, maction, basereg);
+
+ return buffer;
+}
+
+static const struct tracepoint_action_ops m_tracepoint_action_ops =
+{
+ m_tracepoint_action_download,
+ m_tracepoint_action_send,
+};
+
+static CORE_ADDR
+r_tracepoint_action_download (const struct tracepoint_action *action)
+{
+ int size_in_ipa = (sizeof (struct collect_registers_action)
+ - offsetof (struct tracepoint_action, type));
+ CORE_ADDR ipa_action = target_malloc (size_in_ipa);
+
+ write_inferior_memory (ipa_action, (unsigned char *) &action->type,
+ size_in_ipa);
+
+ return ipa_action;
+}
+
+static char *
+r_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
+{
+ return buffer;
+}
+
+static const struct tracepoint_action_ops r_tracepoint_action_ops =
+{
+ r_tracepoint_action_download,
+ r_tracepoint_action_send,
+};
+
+static CORE_ADDR download_agent_expr (struct agent_expr *expr);
+
+static CORE_ADDR
+x_tracepoint_action_download (const struct tracepoint_action *action)
+{
+ int size_in_ipa = (sizeof (struct eval_expr_action)
+ - offsetof (struct tracepoint_action, type));
+ CORE_ADDR ipa_action = target_malloc (size_in_ipa);
+ CORE_ADDR expr;
+
+ write_inferior_memory (ipa_action, (unsigned char *) &action->type,
+ size_in_ipa);
+ expr = download_agent_expr (((struct eval_expr_action *)action)->expr);
+ write_inferior_data_ptr (ipa_action + offsetof (struct eval_expr_action, expr)
+ - offsetof (struct tracepoint_action, type),
+ expr);
+
+ return ipa_action;
+}
+
+/* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL,
+ copy 0 to P. Return updated header of buffer. */
+
+static char *
+agent_expr_send (char *p, const struct agent_expr *aexpr)
+{
+ /* Copy the length of condition first, and then copy its
+ content. */
+ if (aexpr == NULL)
+ {
+ memset (p, 0, 4);
+ p += 4;
+ }
+ else
+ {
+ memcpy (p, &aexpr->length, 4);
+ p +=4;
+
+ memcpy (p, aexpr->bytes, aexpr->length);
+ p += aexpr->length;
+ }
+ return p;
+}
+
+static char *
+x_tracepoint_action_send ( char *buffer, const struct tracepoint_action *action)
+{
+ struct eval_expr_action *eaction = (struct eval_expr_action *) action;
+
+ return agent_expr_send (buffer, eaction->expr);
+}
+
+static const struct tracepoint_action_ops x_tracepoint_action_ops =
+{
+ x_tracepoint_action_download,
+ x_tracepoint_action_send,
+};
+
+static CORE_ADDR
+l_tracepoint_action_download (const struct tracepoint_action *action)
+{
+ int size_in_ipa = (sizeof (struct collect_static_trace_data_action)
+ - offsetof (struct tracepoint_action, type));
+ CORE_ADDR ipa_action = target_malloc (size_in_ipa);
+
+ write_inferior_memory (ipa_action, (unsigned char *) &action->type,
+ size_in_ipa);
+
+ return ipa_action;
+}
+
+static char *
+l_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
+{
+ return buffer;
+}
+
+static const struct tracepoint_action_ops l_tracepoint_action_ops =
+{
+ l_tracepoint_action_download,
+ l_tracepoint_action_send,
+};
+#endif
+
/* This structure describes a piece of the source-level definition of
the tracepoint. The contents are not interpreted by the target,
but preserved verbatim for uploading upon reconnection. */
struct source_string *next;
};
+enum tracepoint_type
+{
+ /* Trap based tracepoint. */
+ trap_tracepoint,
+
+ /* A fast tracepoint implemented with a jump instead of a trap. */
+ fast_tracepoint,
+
+ /* A static tracepoint, implemented by a program call into a tracing
+ library. */
+ static_tracepoint
+};
+
struct tracepoint_hit_ctx;
+typedef enum eval_result_type (*condfn) (struct tracepoint_hit_ctx *,
+ ULONGEST *);
+
/* The definition of a tracepoint. */
/* Tracepoints may have multiple locations, each at a different
{
/* The number of the tracepoint, as specified by GDB. Several
tracepoint objects here may share a number. */
- int number;
+ uint32_t number;
/* Address at which the tracepoint is supposed to trigger. Several
tracepoints may share an address. */
CORE_ADDR address;
+ /* Tracepoint type. */
+ enum tracepoint_type type;
+
/* True if the tracepoint is currently enabled. */
- int enabled;
+ int8_t enabled;
/* The number of single steps that will be performed after each
tracepoint hit. */
- long step_count;
+ uint64_t step_count;
/* The number of times the tracepoint may be hit before it will
terminate the entire tracing run. */
- long pass_count;
+ uint64_t pass_count;
/* Pointer to the agent expression that is the tracepoint's
conditional, or NULL if the tracepoint is unconditional. */
struct agent_expr *cond;
/* The list of actions to take when the tracepoint triggers. */
- int numactions;
+ uint32_t numactions;
struct tracepoint_action **actions;
- /* Same, but in string/packet form. */
- char **actions_str;
-
- /* The list of actions to take while in a stepping loop. */
- int num_step_actions;
- struct tracepoint_action **step_actions;
- /* Same, but in string/packet form. */
- char **step_actions_str;
/* Count of the times we've hit this tracepoint during the run.
Note that while-stepping steps are not counted as "hits". */
- long hit_count;
+ uint64_t hit_count;
+
+ /* Cached sum of the sizes of traceframes created by this point. */
+ uint64_t traceframe_usage;
+
+ CORE_ADDR compiled_cond;
+
+ /* Link to the next tracepoint in the list. */
+ struct tracepoint *next;
+
+#ifndef IN_PROCESS_AGENT
+ /* The list of actions to take when the tracepoint triggers, in
+ string/packet form. */
+ char **actions_str;
/* The collection of strings that describe the tracepoint as it was
entered into GDB. These are not used by the target, but are
reported back to GDB upon reconnection. */
struct source_string *source_strings;
- /* Handle returned by the breakpoint module when we inserted the
- trap. NULL if we haven't inserted it yet. */
+ /* The number of bytes displaced by fast tracepoints. It may subsume
+ multiple instructions, for multi-byte fast tracepoints. This
+ field is only valid for fast tracepoints. */
+ uint32_t orig_size;
+
+ /* Only for fast tracepoints. */
+ CORE_ADDR obj_addr_on_target;
+
+ /* Address range where the original instruction under a fast
+ tracepoint was relocated to. (_end is actually one byte past
+ the end). */
+ CORE_ADDR adjusted_insn_addr;
+ CORE_ADDR adjusted_insn_addr_end;
+
+ /* The address range of the piece of the jump pad buffer that was
+ assigned to this fast tracepoint. (_end is actually one byte
+ past the end).*/
+ CORE_ADDR jump_pad;
+ CORE_ADDR jump_pad_end;
+
+ /* The address range of the piece of the trampoline buffer that was
+ assigned to this fast tracepoint. (_end is actually one byte
+ past the end). */
+ CORE_ADDR trampoline;
+ CORE_ADDR trampoline_end;
+
+ /* The list of actions to take while in a stepping loop. These
+ fields are only valid for patch-based tracepoints. */
+ int num_step_actions;
+ struct tracepoint_action **step_actions;
+ /* Same, but in string/packet form. */
+ char **step_actions_str;
+
+ /* Handle returned by the breakpoint or tracepoint module when we
+ inserted the trap or jump, or hooked into a static tracepoint.
+ NULL if we haven't inserted it yet. */
void *handle;
+#endif
- /* Link to the next tracepoint in the list. */
- struct tracepoint *next;
};
+#ifndef IN_PROCESS_AGENT
+
/* Given `while-stepping', a thread may be collecting data for more
than one tracepoint simultaneously. On the other hand, the same
tracepoint with a while-stepping action may be hit by more than one
long current_step;
};
-/* The linked list of all tracepoints. */
+#endif
+
+/* The linked list of all tracepoints. Marked explicitly as used as
+ the in-process library doesn't use it for the fast tracepoints
+ support. */
+IP_AGENT_EXPORT struct tracepoint *tracepoints ATTR_USED;
-static struct tracepoint *tracepoints;
+#ifndef IN_PROCESS_AGENT
/* Pointer to the last tracepoint in the list, new tracepoints are
linked in at the end. */
static struct tracepoint *last_tracepoint;
+#endif
/* The first tracepoint to exceed its pass count. */
-static struct tracepoint *stopping_tracepoint;
+IP_AGENT_EXPORT struct tracepoint *stopping_tracepoint;
/* True if the trace buffer is full or otherwise no longer usable. */
-static int trace_buffer_is_full;
-
-/* Enumeration of the different kinds of things that can happen during
- agent expression evaluation. */
-
-enum eval_result_type
- {
- expr_eval_no_error,
- expr_eval_empty_expression,
- expr_eval_empty_stack,
- expr_eval_stack_overflow,
- expr_eval_stack_underflow,
- expr_eval_unhandled_opcode,
- expr_eval_unrecognized_opcode,
- expr_eval_divide_by_zero,
- expr_eval_invalid_goto
- };
+IP_AGENT_EXPORT int trace_buffer_is_full;
static enum eval_result_type expr_eval_result = expr_eval_no_error;
+#ifndef IN_PROCESS_AGENT
+
static const char *eval_result_names[] =
{
"terror:in the attic", /* this should never be reported */
"terror:divide by zero"
};
+#endif
+
/* The tracepoint in which the error occurred. */
static struct tracepoint *error_tracepoint;
/* Linked list of all trace state variables. */
-static struct trace_state_variable *trace_state_variables;
+#ifdef IN_PROCESS_AGENT
+struct trace_state_variable *alloced_trace_state_variables;
+#endif
+
+IP_AGENT_EXPORT struct trace_state_variable *trace_state_variables;
/* The results of tracing go into a fixed-size space known as the
"trace buffer". Because usage follows a limited number of
/* The base of the trace data, which is contiguous from this point. */
unsigned char data[0];
-} ATTR_PACKED traceframe_t;
+} ATTR_PACKED;
+
+/* The size of the EOB marker, in bytes. A traceframe with zeroed
+ fields (and no data) marks the end of trace data. */
+#define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data)
/* The traceframe to be used as the source of data to send back to
GDB. A value of -1 means to get data from the live program. */
when it fills, the oldest trace frames are discarded in order to
make room. */
+#ifndef IN_PROCESS_AGENT
static int circular_trace_buffer;
+#endif
+
+/* Size of the trace buffer. */
+
+static LONGEST trace_buffer_size;
/* Pointer to the block of memory that traceframes all go into. */
static unsigned char *trace_buffer_hi;
-/* Pointer to the first trace frame in the buffer. In the
- non-circular case, this is equal to trace_buffer_lo, otherwise it
- moves around in the buffer. */
+/* Control structure holding the read/write/etc. pointers into the
+ trace buffer. We need more than one of these to implement a
+ transaction-like mechanism to garantees that both GDBserver and the
+ in-process agent can try to change the trace buffer
+ simultaneously. */
+
+struct trace_buffer_control
+{
+ /* Pointer to the first trace frame in the buffer. In the
+ non-circular case, this is equal to trace_buffer_lo, otherwise it
+ moves around in the buffer. */
+ unsigned char *start;
+
+ /* Pointer to the free part of the trace buffer. Note that we clear
+ several bytes at and after this pointer, so that traceframe
+ scans/searches terminate properly. */
+ unsigned char *free;
+
+ /* Pointer to the byte after the end of the free part. Note that
+ this may be smaller than trace_buffer_free in the circular case,
+ and means that the free part is in two pieces. Initially it is
+ equal to trace_buffer_hi, then is generally equivalent to
+ trace_buffer_start. */
+ unsigned char *end_free;
+
+ /* Pointer to the wraparound. If not equal to trace_buffer_hi, then
+ this is the point at which the trace data breaks, and resumes at
+ trace_buffer_lo. */
+ unsigned char *wrap;
+};
+
+/* Same as above, to be used by GDBserver when updating the in-process
+ agent. */
+struct ipa_trace_buffer_control
+{
+ uintptr_t start;
+ uintptr_t free;
+ uintptr_t end_free;
+ uintptr_t wrap;
+};
+
+
+/* We have possibly both GDBserver and an inferior thread accessing
+ the same IPA trace buffer memory. The IPA is the producer (tries
+ to put new frames in the buffer), while GDBserver occasionally
+ consumes them, that is, flushes the IPA's buffer into its own
+ buffer. Both sides need to update the trace buffer control
+ pointers (current head, tail, etc.). We can't use a global lock to
+ synchronize the accesses, as otherwise we could deadlock GDBserver
+ (if the thread holding the lock stops for a signal, say). So
+ instead of that, we use a transaction scheme where GDBserver writes
+ always prevail over the IPAs writes, and, we have the IPA detect
+ the commit failure/overwrite, and retry the whole attempt. This is
+ mainly implemented by having a global token object that represents
+ who wrote last to the buffer control structure. We need to freeze
+ any inferior writing to the buffer while GDBserver touches memory,
+ so that the inferior can correctly detect that GDBserver had been
+ there, otherwise, it could mistakingly think its commit was
+ successful; that's implemented by simply having GDBserver set a
+ breakpoint the inferior hits if it is the critical region.
+
+ There are three cycling trace buffer control structure copies
+ (buffer head, tail, etc.), with the token object including an index
+ indicating which is current live copy. The IPA tentatively builds
+ an updated copy in a non-current control structure, while GDBserver
+ always clobbers the current version directly. The IPA then tries
+ to atomically "commit" its version; if GDBserver clobbered the
+ structure meanwhile, that will fail, and the IPA restarts the
+ allocation process.
+
+ Listing the step in further detail, we have:
+
+ In-process agent (producer):
+
+ - passes by `about_to_request_buffer_space' breakpoint/lock
+
+ - reads current token, extracts current trace buffer control index,
+ and starts tentatively updating the rightmost one (0->1, 1->2,
+ 2->0). Note that only one inferior thread is executing this code
+ at any given time, due to an outer lock in the jump pads.
+
+ - updates counters, and tries to commit the token.
+
+ - passes by second `about_to_request_buffer_space' breakpoint/lock,
+ leaving the sync region.
+
+ - checks if the update was effective.
+
+ - if trace buffer was found full, hits flush_trace_buffer
+ breakpoint, and restarts later afterwards.
+
+ GDBserver (consumer):
+
+ - sets `about_to_request_buffer_space' breakpoint/lock.
+
+ - updates the token unconditionally, using the current buffer
+ control index, since it knows that the IP agent always writes to
+ the rightmost, and due to the breakpoint, at most one IP thread
+ can try to update the trace buffer concurrently to GDBserver, so
+ there will be no danger of trace buffer control index wrap making
+ the IPA write to the same index as GDBserver.
+
+ - flushes the IP agent's trace buffer completely, and updates the
+ current trace buffer control structure. GDBserver *always* wins.
+
+ - removes the `about_to_request_buffer_space' breakpoint.
+
+The token is stored in the `trace_buffer_ctrl_curr' variable.
+Internally, it's bits are defined as:
+
+ |-------------+-----+-------------+--------+-------------+--------------|
+ | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 |
+ |-------------+-----+-------------+--------+-------------+--------------|
+ | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) |
+ |-------------+-----+-------------+--------+-------------+--------------|
+
+ GSB - GDBserver Stamp Bit
+ PC - Previous Counter
+ CC - Current Counter
+ TBCI - Trace Buffer Control Index
+
-static unsigned char *trace_buffer_start;
+An IPA update of `trace_buffer_ctrl_curr' does:
-/* Pointer to the free part of the trace buffer. Note that we clear
- several bytes at and after this pointer, so that traceframe
- scans/searches terminate properly. */
+ - read CC from the current token, save as PC.
+ - updates pointers
+ - atomically tries to write PC+1,CC
-static unsigned char *trace_buffer_free;
+A GDBserver update of `trace_buffer_ctrl_curr' does:
-/* Pointer to the byte after the end of the free part. Note that this
- may be smaller than trace_buffer_free in the circular case, and
- means that the free part is in two pieces. Initially it is equal
- to trace_buffer_hi, then is generally equivalent to
- trace_buffer_start. */
+ - reads PC and CC from the current token.
+ - updates pointers
+ - writes GSB,PC,CC
+*/
-static unsigned char *trace_buffer_end_free;
+/* These are the bits of `trace_buffer_ctrl_curr' that are reserved
+ for the counters described below. The cleared bits are used to
+ hold the index of the items of the `trace_buffer_ctrl' array that
+ is "current". */
+#define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0
-/* Pointer to the wraparound. If not equal to trace_buffer_hi, then
- this is the point at which the trace data breaks, and resumes at
- trace_buffer_lo. */
+/* `trace_buffer_ctrl_curr' contains two counters. The `previous'
+ counter, and the `current' counter. */
+
+#define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000
+#define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00
+
+/* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it
+ always stamps this bit as set. */
+#define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000
+
+#ifdef IN_PROCESS_AGENT
+IP_AGENT_EXPORT struct trace_buffer_control trace_buffer_ctrl[3];
+IP_AGENT_EXPORT unsigned int trace_buffer_ctrl_curr;
+
+# define TRACE_BUFFER_CTRL_CURR \
+ (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK)
+
+#else
+
+/* The GDBserver side agent only needs one instance of this object, as
+ it doesn't need to sync with itself. Define it as array anyway so
+ that the rest of the code base doesn't need to care for the
+ difference. */
+struct trace_buffer_control trace_buffer_ctrl[1];
+# define TRACE_BUFFER_CTRL_CURR 0
+#endif
+
+/* These are convenience macros used to access the current trace
+ buffer control in effect. */
+#define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start)
+#define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free)
+#define trace_buffer_end_free \
+ (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free)
+#define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap)
-static unsigned char *trace_buffer_wrap;
/* Macro that returns a pointer to the first traceframe in the buffer. */
: 0)))
/* The difference between these counters represents the total number
- of complete traceframes present in the trace buffer. */
+ of complete traceframes present in the trace buffer. The IP agent
+ writes to the write count, GDBserver writes to read count. */
-static unsigned int traceframe_write_count;
-static unsigned int traceframe_read_count;
+IP_AGENT_EXPORT unsigned int traceframe_write_count;
+IP_AGENT_EXPORT unsigned int traceframe_read_count;
/* Convenience macro. */
/* The count of all traceframes created in the current run, including
ones that were discarded to make room. */
-static int traceframes_created;
+IP_AGENT_EXPORT int traceframes_created;
+
+#ifndef IN_PROCESS_AGENT
/* Read-only regions are address ranges whose contents don't change,
and so can be read from target memory even while looking at a trace
static struct readonly_region *readonly_regions;
+#endif
+
/* The global that controls tracing overall. */
-int tracing;
+IP_AGENT_EXPORT int tracing;
+
+#ifndef IN_PROCESS_AGENT
/* Controls whether tracing should continue after GDB disconnects. */
static int tracing_stop_tpnum;
+/* 64-bit timestamps for the trace run's start and finish, expressed
+ in microseconds from the Unix epoch. */
+
+LONGEST tracing_start_time;
+LONGEST tracing_stop_time;
+
+/* The (optional) user-supplied name of the user that started the run.
+ This is an arbitrary string, and may be NULL. */
+
+char *tracing_user_name;
+
+/* Optional user-supplied text describing the run. This is
+ an arbitrary string, and may be NULL. */
+
+char *tracing_notes;
+
+/* Optional user-supplied text explaining a tstop command. This is an
+ arbitrary string, and may be NULL. */
+
+char *tracing_stop_note;
+
+#endif
+
/* Functions local to this file. */
/* Base "class" for tracepoint type specific data to be passed down to
- collect_data_at_tracepoint. */
+ collect_data_at_tracepoint. */
struct tracepoint_hit_ctx
{
- /* empty */
+ enum tracepoint_type type;
+};
+
+#ifdef IN_PROCESS_AGENT
+
+/* Fast/jump tracepoint specific data to be passed down to
+ collect_data_at_tracepoint. */
+struct fast_tracepoint_ctx
+{
+ struct tracepoint_hit_ctx base;
+
+ struct regcache regcache;
+ int regcache_initted;
+ unsigned char *regspace;
+
+ unsigned char *regs;
+ struct tracepoint *tpoint;
};
-/* Trap tracepoint specific data to be passed down to
+/* Static tracepoint specific data to be passed down to
collect_data_at_tracepoint. */
+struct static_tracepoint_ctx
+{
+ struct tracepoint_hit_ctx base;
+
+ /* The regcache corresponding to the registers state at the time of
+ the tracepoint hit. Initialized lazily, from REGS. */
+ struct regcache regcache;
+ int regcache_initted;
+
+ /* The buffer space REGCACHE above uses. We use a separate buffer
+ instead of letting the regcache malloc for both signal safety and
+ performance reasons; this is allocated on the stack instead. */
+ unsigned char *regspace;
+
+ /* The register buffer as passed on by lttng/ust. */
+ struct registers *regs;
+
+ /* The "printf" formatter and the args the user passed to the marker
+ call. We use this to be able to collect "static trace data"
+ ($_sdata). */
+ const char *fmt;
+ va_list *args;
+ /* The GDB tracepoint matching the probed marker that was "hit". */
+ struct tracepoint *tpoint;
+};
+
+#else
+
+/* Static tracepoint specific data to be passed down to
+ collect_data_at_tracepoint. */
struct trap_tracepoint_ctx
{
struct tracepoint_hit_ctx base;
struct regcache *regcache;
};
-static struct agent_expr *parse_agent_expr (char **actparm);
-static char *unparse_agent_expr (struct agent_expr *aexpr);
-static enum eval_result_type eval_agent_expr (struct tracepoint_hit_ctx *ctx,
- struct traceframe *tframe,
- struct agent_expr *aexpr,
- ULONGEST *rslt);
-
-static int agent_mem_read (struct traceframe *tframe,
- unsigned char *to, CORE_ADDR from, ULONGEST len);
-static int agent_tsv_read (struct traceframe *tframe, int n);
+#endif
+#ifndef IN_PROCESS_AGENT
static CORE_ADDR traceframe_get_pc (struct traceframe *tframe);
static int traceframe_read_tsv (int num, LONGEST *val);
+#endif
static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx,
struct tracepoint *tpoint);
+#ifndef IN_PROCESS_AGENT
static void clear_readonly_regions (void);
static void clear_installed_tracepoints (void);
+#endif
static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
CORE_ADDR stop_pc,
struct tracepoint *tpoint);
-
+#ifndef IN_PROCESS_AGENT
static void collect_data_at_step (struct tracepoint_hit_ctx *ctx,
CORE_ADDR stop_pc,
struct tracepoint *tpoint, int current_step);
-
+static void compile_tracepoint_condition (struct tracepoint *tpoint,
+ CORE_ADDR *jump_entry);
+#endif
static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx,
CORE_ADDR stop_pc,
struct tracepoint *tpoint,
struct traceframe *tframe,
struct tracepoint_action *taction);
+#ifndef IN_PROCESS_AGENT
+static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR);
+
+static void install_tracepoint (struct tracepoint *, char *own_buf);
+static void download_tracepoint (struct tracepoint *);
+static int install_fast_tracepoint (struct tracepoint *, char *errbuf);
+static void clone_fast_tracepoint (struct tracepoint *to,
+ const struct tracepoint *from);
+#endif
+
+static LONGEST get_timestamp (void);
+
+#if defined(__GNUC__)
+# define memory_barrier() asm volatile ("" : : : "memory")
+#else
+# define memory_barrier() do {} while (0)
+#endif
+
+/* We only build the IPA if this builtin is supported, and there are
+ no uses of this in GDBserver itself, so we're safe in defining this
+ unconditionally. */
+#define cmpxchg(mem, oldval, newval) \
+ __sync_val_compare_and_swap (mem, oldval, newval)
+
/* Record that an error occurred during expression evaluation. */
static void
trace_debug ("Tracepoint %d at %s %s eval reports error %d",
tpoint->number, paddress (tpoint->address), which, rtype);
- expr_eval_result = rtype;
+#ifdef IN_PROCESS_AGENT
+ /* Only record the first error we get. */
+ if (cmpxchg (&expr_eval_result,
+ expr_eval_no_error,
+ rtype) != expr_eval_no_error)
+ return;
+#else
+ if (expr_eval_result != expr_eval_no_error)
+ return;
+#endif
+
error_tracepoint = tpoint;
}
traceframes_created = 0;
}
+#ifndef IN_PROCESS_AGENT
+
+static void
+clear_inferior_trace_buffer (void)
+{
+ CORE_ADDR ipa_trace_buffer_lo;
+ CORE_ADDR ipa_trace_buffer_hi;
+ struct traceframe ipa_traceframe = { 0 };
+ struct ipa_trace_buffer_control ipa_trace_buffer_ctrl;
+
+ read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo,
+ &ipa_trace_buffer_lo);
+ read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi,
+ &ipa_trace_buffer_hi);
+
+ ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo;
+ ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo;
+ ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi;
+ ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
+
+ /* A traceframe with zeroed fields marks the end of trace data. */
+ write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl,
+ (unsigned char *) &ipa_trace_buffer_ctrl,
+ sizeof (ipa_trace_buffer_ctrl));
+
+ write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0);
+
+ /* A traceframe with zeroed fields marks the end of trace data. */
+ write_inferior_memory (ipa_trace_buffer_lo,
+ (unsigned char *) &ipa_traceframe,
+ sizeof (ipa_traceframe));
+
+ write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0);
+ write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0);
+ write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0);
+}
+
+#endif
+
static void
-init_trace_buffer (unsigned char *buf, int bufsize)
+init_trace_buffer (LONGEST bufsize)
{
- trace_buffer_lo = buf;
- trace_buffer_hi = trace_buffer_lo + bufsize;
+ size_t alloc_size;
+
+ trace_buffer_size = bufsize;
+
+ /* Make sure to internally allocate at least space for the EOB
+ marker. */
+ alloc_size = (bufsize < TRACEFRAME_EOB_MARKER_SIZE
+ ? TRACEFRAME_EOB_MARKER_SIZE : bufsize);
+ trace_buffer_lo = xrealloc (trace_buffer_lo, alloc_size);
+
+ trace_buffer_hi = trace_buffer_lo + trace_buffer_size;
clear_trace_buffer ();
}
+#ifdef IN_PROCESS_AGENT
+
+IP_AGENT_EXPORT void ATTR_USED ATTR_NOINLINE
+about_to_request_buffer_space (void)
+{
+ /* GDBserver places breakpoint here while it goes about to flush
+ data at random times. */
+ UNKNOWN_SIDE_EFFECTS();
+}
+
+#endif
+
/* Carve out a piece of the trace buffer, returning NULL in case of
failure. */
trace_buffer_alloc (size_t amt)
{
unsigned char *rslt;
+ struct trace_buffer_control *tbctrl;
+ unsigned int curr;
+#ifdef IN_PROCESS_AGENT
+ unsigned int prev, prev_filtered;
+ unsigned int commit_count;
+ unsigned int commit;
+ unsigned int readout;
+#else
struct traceframe *oldest;
unsigned char *new_start;
+#endif
trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
(long) amt, (long) sizeof (struct traceframe));
/* Account for the EOB marker. */
- amt += sizeof (struct traceframe);
+ amt += TRACEFRAME_EOB_MARKER_SIZE;
+
+#ifdef IN_PROCESS_AGENT
+ again:
+ memory_barrier ();
+
+ /* Read the current token and extract the index to try to write to,
+ storing it in CURR. */
+ prev = trace_buffer_ctrl_curr;
+ prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK;
+ curr = prev_filtered + 1;
+ if (curr > 2)
+ curr = 0;
+
+ about_to_request_buffer_space ();
+
+ /* Start out with a copy of the current state. GDBserver may be
+ midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
+ be able to commit anyway if that happens. */
+ trace_buffer_ctrl[curr]
+ = trace_buffer_ctrl[prev_filtered];
+ trace_debug ("trying curr=%u", curr);
+#else
+ /* The GDBserver's agent doesn't need all that syncing, and always
+ updates TCB 0 (there's only one, mind you). */
+ curr = 0;
+#endif
+ tbctrl = &trace_buffer_ctrl[curr];
/* Offsets are easier to grok for debugging than raw addresses,
especially for the small trace buffer sizes that are useful for
testing. */
- trace_debug ("Trace buffer start=%d free=%d endfree=%d wrap=%d hi=%d",
- (int) (trace_buffer_start - trace_buffer_lo),
- (int) (trace_buffer_free - trace_buffer_lo),
- (int) (trace_buffer_end_free - trace_buffer_lo),
- (int) (trace_buffer_wrap - trace_buffer_lo),
+ trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
+ curr,
+ (int) (tbctrl->start - trace_buffer_lo),
+ (int) (tbctrl->free - trace_buffer_lo),
+ (int) (tbctrl->end_free - trace_buffer_lo),
+ (int) (tbctrl->wrap - trace_buffer_lo),
(int) (trace_buffer_hi - trace_buffer_lo));
/* The algorithm here is to keep trying to get a contiguous block of
while (1)
{
/* First, if we have two free parts, try the upper one first. */
- if (trace_buffer_end_free < trace_buffer_free)
+ if (tbctrl->end_free < tbctrl->free)
{
- if (trace_buffer_free + amt <= trace_buffer_hi)
+ if (tbctrl->free + amt <= trace_buffer_hi)
/* We have enough in the upper part. */
break;
else
space later, if/when the wrapped-around traceframe is
discarded. */
trace_debug ("Upper part too small, setting wraparound");
- trace_buffer_wrap = trace_buffer_free;
- trace_buffer_free = trace_buffer_lo;
+ tbctrl->wrap = tbctrl->free;
+ tbctrl->free = trace_buffer_lo;
}
}
/* The normal case. */
- if (trace_buffer_free + amt <= trace_buffer_end_free)
+ if (tbctrl->free + amt <= tbctrl->end_free)
break;
+#ifdef IN_PROCESS_AGENT
+ /* The IP Agent's buffer is always circular. It isn't used
+ currently, but `circular_trace_buffer' could represent
+ GDBserver's mode. If we didn't find space, ask GDBserver to
+ flush. */
+
+ flush_trace_buffer ();
+ memory_barrier ();
+ if (tracing)
+ {
+ trace_debug ("gdbserver flushed buffer, retrying");
+ goto again;
+ }
+
+ /* GDBserver cancelled the tracing. Bail out as well. */
+ return NULL;
+#else
/* If we're here, then neither part is big enough, and
non-circular trace buffers are now full. */
if (!circular_trace_buffer)
return NULL;
}
+ /* We don't run this code in the in-process agent currently.
+ E.g., we could leave the in-process agent in autonomous
+ circular mode if we only have fast tracepoints. If we do
+ that, then this bit becomes racy with GDBserver, which also
+ writes to this counter. */
--traceframe_write_count;
new_start = (unsigned char *) NEXT_TRACEFRAME (oldest);
/* If we freed the traceframe that wrapped around, go back
to the non-wrap case. */
- if (new_start < trace_buffer_start)
+ if (new_start < tbctrl->start)
{
trace_debug ("Discarding past the wraparound");
- trace_buffer_wrap = trace_buffer_hi;
+ tbctrl->wrap = trace_buffer_hi;
}
- trace_buffer_start = new_start;
- trace_buffer_end_free = trace_buffer_start;
+ tbctrl->start = new_start;
+ tbctrl->end_free = tbctrl->start;
trace_debug ("Discarded a traceframe\n"
- "Trace buffer, start=%d free=%d endfree=%d wrap=%d hi=%d",
- (int) (trace_buffer_start - trace_buffer_lo),
- (int) (trace_buffer_free - trace_buffer_lo),
- (int) (trace_buffer_end_free - trace_buffer_lo),
- (int) (trace_buffer_wrap - trace_buffer_lo),
+ "Trace buffer [%d], start=%d free=%d "
+ "endfree=%d wrap=%d hi=%d",
+ curr,
+ (int) (tbctrl->start - trace_buffer_lo),
+ (int) (tbctrl->free - trace_buffer_lo),
+ (int) (tbctrl->end_free - trace_buffer_lo),
+ (int) (tbctrl->wrap - trace_buffer_lo),
(int) (trace_buffer_hi - trace_buffer_lo));
/* Now go back around the loop. The discard might have resulted
in either one or two pieces of free space, so we want to try
both before freeing any more traceframes. */
+#endif
}
/* If we get here, we know we can provide the asked-for space. */
- rslt = trace_buffer_free;
+ rslt = tbctrl->free;
/* Adjust the request back down, now that we know we have space for
- the marker. */
- trace_buffer_free += (amt - sizeof (struct traceframe));
+ the marker, but don't commit to AMT yet, we may still need to
+ restart the operation if GDBserver touches the trace buffer
+ (obviously only important in the in-process agent's version). */
+ tbctrl->free += (amt - sizeof (struct traceframe));
+
+ /* Or not. If GDBserver changed the trace buffer behind our back,
+ we get to restart a new allocation attempt. */
+
+#ifdef IN_PROCESS_AGENT
+ /* Build the tentative token. */
+ commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100)
+ & GDBSERVER_FLUSH_COUNT_MASK_CURR);
+ commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12)
+ | commit_count
+ | curr);
+
+ /* Try to commit it. */
+ readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit);
+ if (readout != prev)
+ {
+ trace_debug ("GDBserver has touched the trace buffer, restarting."
+ " (prev=%08x, commit=%08x, readout=%08x)",
+ prev, commit, readout);
+ goto again;
+ }
+
+ /* Hold your horses here. Even if that change was committed,
+ GDBserver could come in, and clobber it. We need to hold to be
+ able to tell if GDBserver clobbers before or after we committed
+ the change. Whenever GDBserver goes about touching the IPA
+ buffer, it sets a breakpoint in this routine, so we have a sync
+ point here. */
+ about_to_request_buffer_space ();
+
+ /* Check if the change has been effective, even if GDBserver stopped
+ us at the breakpoint. */
+
+ {
+ unsigned int refetch;
+
+ memory_barrier ();
+
+ refetch = trace_buffer_ctrl_curr;
+
+ if (refetch == commit
+ || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count)
+ {
+ /* effective */
+ trace_debug ("change is effective: (prev=%08x, commit=%08x, "
+ "readout=%08x, refetch=%08x)",
+ prev, commit, readout, refetch);
+ }
+ else
+ {
+ trace_debug ("GDBserver has touched the trace buffer, not effective."
+ " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
+ prev, commit, readout, refetch);
+ goto again;
+ }
+ }
+#endif
/* We have a new piece of the trace buffer. Hurray! */
/* Add an EOB marker just past this allocation. */
- ((struct traceframe *) trace_buffer_free)->tpnum = 0;
- ((struct traceframe *) trace_buffer_free)->data_size = 0;
+ ((struct traceframe *) tbctrl->free)->tpnum = 0;
+ ((struct traceframe *) tbctrl->free)->data_size = 0;
/* Adjust the request back down, now that we know we have space for
the marker. */
if (debug_threads)
{
trace_debug ("Allocated %d bytes", (int) amt);
- trace_debug ("Trace buffer start=%d free=%d endfree=%d wrap=%d hi=%d",
- (int) (trace_buffer_start - trace_buffer_lo),
- (int) (trace_buffer_free - trace_buffer_lo),
- (int) (trace_buffer_end_free - trace_buffer_lo),
- (int) (trace_buffer_wrap - trace_buffer_lo),
+ trace_debug ("Trace buffer [%d] start=%d free=%d "
+ "endfree=%d wrap=%d hi=%d",
+ curr,
+ (int) (tbctrl->start - trace_buffer_lo),
+ (int) (tbctrl->free - trace_buffer_lo),
+ (int) (tbctrl->end_free - trace_buffer_lo),
+ (int) (tbctrl->wrap - trace_buffer_lo),
(int) (trace_buffer_hi - trace_buffer_lo));
}
return rslt;
}
+#ifndef IN_PROCESS_AGENT
+
/* Return the total free space. This is not necessarily the largest
block we can allocate, because of the two-part case. */
static int seen_step_action_flag;
-/* Create a tracepoint (location) with given number and address. */
+/* Create a tracepoint (location) with given number and address. Add this
+ new tracepoint to list and sort this list. */
static struct tracepoint *
add_tracepoint (int num, CORE_ADDR addr)
{
- struct tracepoint *tpoint;
+ struct tracepoint *tpoint, **tp_next;
tpoint = xmalloc (sizeof (struct tracepoint));
tpoint->number = num;
tpoint->num_step_actions = 0;
tpoint->step_actions = NULL;
tpoint->step_actions_str = NULL;
+ /* Start all off as regular (slow) tracepoints. */
+ tpoint->type = trap_tracepoint;
+ tpoint->orig_size = -1;
tpoint->source_strings = NULL;
+ tpoint->compiled_cond = 0;
tpoint->handle = NULL;
tpoint->next = NULL;
- if (!last_tracepoint)
- tracepoints = tpoint;
- else
- last_tracepoint->next = tpoint;
+ /* Find a place to insert this tracepoint into list in order to keep
+ the tracepoint list still in the ascending order. There may be
+ multiple tracepoints at the same address as TPOINT's, and this
+ guarantees TPOINT is inserted after all the tracepoints which are
+ set at the same address. For example, fast tracepoints A, B, C are
+ set at the same address, and D is to be insert at the same place as
+ well,
+
+ -->| A |--> | B |-->| C |->...
+
+ One jump pad was created for tracepoint A, B, and C, and the target
+ address of A is referenced/used in jump pad. So jump pad will let
+ inferior jump to A. If D is inserted in front of A, like this,
+
+ -->| D |-->| A |--> | B |-->| C |->...
+
+ without updating jump pad, D is not reachable during collect, which
+ is wrong. As we can see, the order of B, C and D doesn't matter, but
+ A should always be the `first' one. */
+ for (tp_next = &tracepoints;
+ (*tp_next) != NULL && (*tp_next)->address <= tpoint->address;
+ tp_next = &(*tp_next)->next)
+ ;
+ tpoint->next = *tp_next;
+ *tp_next = tpoint;
last_tracepoint = tpoint;
seen_step_action_flag = 0;
return tpoint;
}
+#ifndef IN_PROCESS_AGENT
+
/* Return the tracepoint with the given number and address, or NULL. */
static struct tracepoint *
return NULL;
}
+/* Remove TPOINT from global list. */
+
+static void
+remove_tracepoint (struct tracepoint *tpoint)
+{
+ struct tracepoint *tp, *tp_prev;
+
+ for (tp = tracepoints, tp_prev = NULL; tp && tp != tpoint;
+ tp_prev = tp, tp = tp->next)
+ ;
+
+ if (tp)
+ {
+ if (tp_prev)
+ tp_prev->next = tp->next;
+ else
+ tracepoints = tp->next;
+
+ xfree (tp);
+ }
+}
+
/* There may be several tracepoints with the same number (because they
are "locations", in GDB parlance); return the next one after the
given tracepoint, or search from the beginning of the list if the
return NULL;
}
-static char *
-save_string (const char *str, size_t len)
-{
- char *s;
-
- s = xmalloc (len + 1);
- memcpy (s, str, len);
- s[len] = '\0';
-
- return s;
-}
+#endif
/* Append another action to perform when the tracepoint triggers. */
maction = xmalloc (sizeof *maction);
maction->base.type = *act;
+ maction->base.ops = &m_tracepoint_action_ops;
action = &maction->base;
++act;
raction = xmalloc (sizeof *raction);
raction->base.type = *act;
+ raction->base.ops = &r_tracepoint_action_ops;
action = &raction->base;
trace_debug ("Want to collect registers");
++act;
break;
}
+ case 'L':
+ {
+ struct collect_static_trace_data_action *raction;
+
+ raction = xmalloc (sizeof *raction);
+ raction->base.type = *act;
+ raction->base.ops = &l_tracepoint_action_ops;
+ action = &raction->base;
+
+ trace_debug ("Want to collect static trace data");
+ ++act;
+ break;
+ }
case 'S':
trace_debug ("Unexpected step action, ignoring");
++act;
xaction = xmalloc (sizeof (*xaction));
xaction->base.type = *act;
+ xaction->base.ops = &x_tracepoint_action_ops;
action = &xaction->base;
trace_debug ("Want to evaluate expression");
- xaction->expr = parse_agent_expr (&act);
+ xaction->expr = gdb_parse_agent_expr (&act);
break;
}
default:
* tpoint->num_step_actions));
tpoint->step_actions[tpoint->num_step_actions - 1] = action;
tpoint->step_actions_str[tpoint->num_step_actions - 1]
- = save_string (act_start, act - act_start);
+ = savestring (act_start, act - act_start);
}
else
{
sizeof (*tpoint->actions_str) * tpoint->numactions);
tpoint->actions[tpoint->numactions - 1] = action;
tpoint->actions_str[tpoint->numactions - 1]
- = save_string (act_start, act - act_start);
+ = savestring (act_start, act - act_start);
}
}
}
+#endif
+
/* Find or create a trace state variable with the given number. */
static struct trace_state_variable *
{
struct trace_state_variable *tsv;
+#ifdef IN_PROCESS_AGENT
+ /* Search for an existing variable. */
+ for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next)
+ if (tsv->number == num)
+ return tsv;
+#endif
+
/* Search for an existing variable. */
for (tsv = trace_state_variables; tsv; tsv = tsv->next)
if (tsv->number == num)
/* Find or create a trace state variable with the given number. */
static struct trace_state_variable *
-create_trace_state_variable (int num)
+create_trace_state_variable (int num, int gdb)
{
struct trace_state_variable *tsv;
tsv->value = 0;
tsv->getter = NULL;
tsv->name = NULL;
- tsv->next = trace_state_variables;
- trace_state_variables = tsv;
-
+#ifdef IN_PROCESS_AGENT
+ if (!gdb)
+ {
+ tsv->next = alloced_trace_state_variables;
+ alloced_trace_state_variables = tsv;
+ }
+ else
+#endif
+ {
+ tsv->next = trace_state_variables;
+ trace_state_variables = tsv;
+ }
return tsv;
}
-static LONGEST
+IP_AGENT_EXPORT LONGEST
get_trace_state_variable_value (int num)
{
struct trace_state_variable *tsv;
return tsv->value;
}
-static void
+IP_AGENT_EXPORT void
set_trace_state_variable_value (int num, LONGEST val)
{
struct trace_state_variable *tsv;
tsv->value = val;
}
+LONGEST
+agent_get_trace_state_variable_value (int num)
+{
+ return get_trace_state_variable_value (num);
+}
+
+void
+agent_set_trace_state_variable_value (int num, LONGEST val)
+{
+ set_trace_state_variable_value (num, val);
+}
+
static void
set_trace_state_variable_name (int num, const char *name)
{
/* Add a block to the traceframe currently being worked on. */
static unsigned char *
-add_traceframe_block (struct traceframe *tframe, int amt)
+add_traceframe_block (struct traceframe *tframe,
+ struct tracepoint *tpoint, int amt)
{
unsigned char *block;
if (!block)
return NULL;
+ gdb_assert (tframe->tpnum == tpoint->number);
+
tframe->data_size += amt;
+ tpoint->traceframe_usage += amt;
return block;
}
++traceframes_created;
}
+#ifndef IN_PROCESS_AGENT
+
/* Given a traceframe number NUM, find the NUMth traceframe in the
buffer. */
return NULL;
}
+#endif
+
+#ifndef IN_PROCESS_AGENT
+
/* Clear all past trace state. */
static void
/* Make sure we don't try to read from a trace frame. */
current_traceframe = -1;
+ stop_tracing ();
+
trace_debug ("Initializing the trace");
clear_installed_tracepoints ();
}
clear_trace_buffer ();
+ clear_inferior_trace_buffer ();
write_ok (packet);
}
+/* Unprobe the UST marker at ADDRESS. */
+
+static void
+unprobe_marker_at (CORE_ADDR address)
+{
+ char cmd[IPA_CMD_BUF_SIZE];
+
+ sprintf (cmd, "unprobe_marker_at:%s", paddress (address));
+ run_inferior_command (cmd, strlen (cmd) + 1);
+}
+
/* Restore the program to its pre-tracing state. This routine may be called
in error situations, so it needs to be careful about only restoring
from known-valid bits. */
struct tracepoint *tpoint;
struct tracepoint *prev_stpoint;
+ pause_all (1);
+ cancel_breakpoints ();
+
prev_stpoint = NULL;
/* Restore any bytes overwritten by tracepoints. */
for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
{
- if (!tpoint->enabled)
- continue;
-
/* Catch the case where we might try to remove a tracepoint that
was never actually installed. */
if (tpoint->handle == NULL)
continue;
}
- delete_breakpoint (tpoint->handle);
+ switch (tpoint->type)
+ {
+ case trap_tracepoint:
+ delete_breakpoint (tpoint->handle);
+ break;
+ case fast_tracepoint:
+ delete_fast_tracepoint_jump (tpoint->handle);
+ break;
+ case static_tracepoint:
+ if (prev_stpoint != NULL
+ && prev_stpoint->address == tpoint->address)
+ /* Nothing to do. We already unprobed a tracepoint set at
+ this marker address (and there can only be one probe
+ per marker). */
+ ;
+ else
+ {
+ unprobe_marker_at (tpoint->address);
+ prev_stpoint = tpoint;
+ }
+ break;
+ }
+
tpoint->handle = NULL;
}
+
+ unpause_all (1);
}
/* Parse a packet that defines a tracepoint. */
cmd_qtdp (char *own_buf)
{
int tppacket;
+ /* Whether there is a trailing hyphen at the end of the QTDP packet. */
+ int trail_hyphen = 0;
ULONGEST num;
ULONGEST addr;
ULONGEST count;
while (*packet == ':')
{
++packet;
- if (*packet == 'X')
+ if (*packet == 'F')
+ {
+ tpoint->type = fast_tracepoint;
+ ++packet;
+ packet = unpack_varlen_hex (packet, &count);
+ tpoint->orig_size = count;
+ }
+ else if (*packet == 'S')
+ {
+ tpoint->type = static_tracepoint;
+ ++packet;
+ }
+ else if (*packet == 'X')
{
actparm = (char *) packet;
- tpoint->cond = parse_agent_expr (&actparm);
+ tpoint->cond = gdb_parse_agent_expr (&actparm);
packet = actparm;
}
else if (*packet == '-')
trace_debug ("Unknown optional tracepoint field");
}
if (*packet == '-')
- trace_debug ("Also has actions\n");
+ {
+ trail_hyphen = 1;
+ trace_debug ("Also has actions\n");
+ }
- trace_debug ("Defined tracepoint %d at 0x%s, "
- "enabled %d step %ld pass %ld",
- tpoint->number, paddress (tpoint->address),
- tpoint->enabled,
+ trace_debug ("Defined %stracepoint %d at 0x%s, "
+ "enabled %d step %" PRIu64 " pass %" PRIu64,
+ tpoint->type == fast_tracepoint ? "fast "
+ : tpoint->type == static_tracepoint ? "static " : "",
+ tpoint->number, paddress (tpoint->address), tpoint->enabled,
tpoint->step_count, tpoint->pass_count);
}
else if (tpoint)
return;
}
- write_ok (own_buf);
-}
-
-static void
-cmd_qtdpsrc (char *own_buf)
-{
- ULONGEST num, addr, start, slen;
- struct tracepoint *tpoint;
- char *packet = own_buf;
- char *saved, *srctype, *src;
- size_t nbytes;
- struct source_string *last, *newlast;
+ /* Install tracepoint during tracing only once for each tracepoint location.
+ For each tracepoint loc, GDB may send multiple QTDP packets, and we can
+ determine the last QTDP packet for one tracepoint location by checking
+ trailing hyphen in QTDP packet. */
+ if (tracing && !trail_hyphen)
+ {
+ struct tracepoint *tp = NULL;
- packet += strlen ("QTDPsrc:");
+ /* Pause all threads temporarily while we patch tracepoints. */
+ pause_all (0);
- packet = unpack_varlen_hex (packet, &num);
- ++packet; /* skip a colon */
- packet = unpack_varlen_hex (packet, &addr);
- ++packet; /* skip a colon */
+ /* download_tracepoint will update global `tracepoints'
+ list, so it is unsafe to leave threads in jump pad. */
+ stabilize_threads ();
- /* See if we already have this tracepoint. */
- tpoint = find_tracepoint (num, addr);
+ /* Freeze threads. */
+ pause_all (1);
- if (!tpoint)
- {
- trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
- (int) num, paddress (addr));
- write_enn (own_buf);
- return;
- }
- saved = packet;
- packet = strchr (packet, ':');
+ if (tpoint->type != trap_tracepoint)
+ {
+ /* Find another fast or static tracepoint at the same address. */
+ for (tp = tracepoints; tp; tp = tp->next)
+ {
+ if (tp->address == tpoint->address && tp->type == tpoint->type
+ && tp->number != tpoint->number)
+ break;
+ }
+
+ /* TPOINT is installed at the same address as TP. */
+ if (tp)
+ {
+ if (tpoint->type == fast_tracepoint)
+ clone_fast_tracepoint (tpoint, tp);
+ else if (tpoint->type == static_tracepoint)
+ tpoint->handle = (void *) -1;
+ }
+ }
+
+ if (use_agent && tpoint->type == fast_tracepoint
+ && agent_capability_check (AGENT_CAPA_FAST_TRACE))
+ {
+ /* Download and install fast tracepoint by agent. */
+ if (tracepoint_send_agent (tpoint) == 0)
+ write_ok (own_buf);
+ else
+ {
+ write_enn (own_buf);
+ remove_tracepoint (tpoint);
+ }
+ }
+ else
+ {
+ download_tracepoint (tpoint);
+
+ if (tpoint->type == trap_tracepoint || tp == NULL)
+ {
+ install_tracepoint (tpoint, own_buf);
+ if (strcmp (own_buf, "OK") != 0)
+ remove_tracepoint (tpoint);
+ }
+ else
+ write_ok (own_buf);
+ }
+
+ unpause_all (1);
+ return;
+ }
+
+ write_ok (own_buf);
+}
+
+static void
+cmd_qtdpsrc (char *own_buf)
+{
+ ULONGEST num, addr, start, slen;
+ struct tracepoint *tpoint;
+ char *packet = own_buf;
+ char *saved, *srctype, *src;
+ size_t nbytes;
+ struct source_string *last, *newlast;
+
+ packet += strlen ("QTDPsrc:");
+
+ packet = unpack_varlen_hex (packet, &num);
+ ++packet; /* skip a colon */
+ packet = unpack_varlen_hex (packet, &addr);
+ ++packet; /* skip a colon */
+
+ /* See if we already have this tracepoint. */
+ tpoint = find_tracepoint (num, addr);
+
+ if (!tpoint)
+ {
+ trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
+ (int) num, paddress (addr));
+ write_enn (own_buf);
+ return;
+ }
+
+ saved = packet;
+ packet = strchr (packet, ':');
srctype = xmalloc (packet - saved + 1);
memcpy (srctype, saved, packet - saved);
srctype[packet - saved] = '\0';
packet = unpack_varlen_hex (packet, &slen);
++packet; /* skip a colon */
src = xmalloc (slen + 1);
- nbytes = unhexify (src, packet, strlen (packet) / 2);
+ nbytes = hex2bin (packet, (gdb_byte *) src, strlen (packet) / 2);
src[nbytes] = '\0';
newlast = xmalloc (sizeof (struct source_string));
nbytes = strlen (packet) / 2;
varname = xmalloc (nbytes + 1);
- nbytes = unhexify (varname, packet, nbytes);
+ nbytes = hex2bin (packet, (gdb_byte *) varname, nbytes);
varname[nbytes] = '\0';
- tsv = create_trace_state_variable (num);
+ tsv = create_trace_state_variable (num, 1);
tsv->initial_value = (LONGEST) val;
tsv->name = varname;
write_ok (own_buf);
}
+static void
+cmd_qtenable_disable (char *own_buf, int enable)
+{
+ char *packet = own_buf;
+ ULONGEST num, addr;
+ struct tracepoint *tp;
+
+ packet += strlen (enable ? "QTEnable:" : "QTDisable:");
+ packet = unpack_varlen_hex (packet, &num);
+ ++packet; /* skip a colon */
+ packet = unpack_varlen_hex (packet, &addr);
+
+ tp = find_tracepoint (num, addr);
+
+ if (tp)
+ {
+ if ((enable && tp->enabled) || (!enable && !tp->enabled))
+ {
+ trace_debug ("Tracepoint %d at 0x%s is already %s",
+ (int) num, paddress (addr),
+ enable ? "enabled" : "disabled");
+ write_ok (own_buf);
+ return;
+ }
+
+ trace_debug ("%s tracepoint %d at 0x%s",
+ enable ? "Enabling" : "Disabling",
+ (int) num, paddress (addr));
+
+ tp->enabled = enable;
+
+ if (tp->type == fast_tracepoint || tp->type == static_tracepoint)
+ {
+ int ret;
+ int offset = offsetof (struct tracepoint, enabled);
+ CORE_ADDR obj_addr = tp->obj_addr_on_target + offset;
+
+ ret = prepare_to_access_memory ();
+ if (ret)
+ {
+ trace_debug ("Failed to temporarily stop inferior threads");
+ write_enn (own_buf);
+ return;
+ }
+
+ ret = write_inferior_integer (obj_addr, enable);
+ done_accessing_memory ();
+
+ if (ret)
+ {
+ trace_debug ("Cannot write enabled flag into "
+ "inferior process memory");
+ write_enn (own_buf);
+ return;
+ }
+ }
+
+ write_ok (own_buf);
+ }
+ else
+ {
+ trace_debug ("Tracepoint %d at 0x%s not found",
+ (int) num, paddress (addr));
+ write_enn (own_buf);
+ }
+}
+
static void
cmd_qtv (char *own_buf)
{
ULONGEST num;
- LONGEST val;
+ LONGEST val = 0;
int err;
char *packet = own_buf;
packet += strlen ("qTV:");
- packet = unpack_varlen_hex (packet, &num);
+ unpack_varlen_hex (packet, &num);
if (current_traceframe >= 0)
{
return 0;
}
+/* The maximum size of a jump pad entry. */
+static const int max_jump_pad_size = 0x100;
+
+static CORE_ADDR gdb_jump_pad_head;
+
+/* Return the address of the next free jump space. */
+
+static CORE_ADDR
+get_jump_space_head (void)
+{
+ if (gdb_jump_pad_head == 0)
+ {
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer,
+ &gdb_jump_pad_head))
+ fatal ("error extracting jump_pad_buffer");
+ }
+
+ return gdb_jump_pad_head;
+}
+
+/* Reserve USED bytes from the jump space. */
+
+static void
+claim_jump_space (ULONGEST used)
+{
+ trace_debug ("claim_jump_space reserves %s bytes at %s",
+ pulongest (used), paddress (gdb_jump_pad_head));
+ gdb_jump_pad_head += used;
+}
+
+static CORE_ADDR trampoline_buffer_head = 0;
+static CORE_ADDR trampoline_buffer_tail;
+
+/* Reserve USED bytes from the trampoline buffer and return the
+ address of the start of the reserved space in TRAMPOLINE. Returns
+ non-zero if the space is successfully claimed. */
+
+int
+claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline)
+{
+ if (!trampoline_buffer_head)
+ {
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer,
+ &trampoline_buffer_tail))
+ {
+ fatal ("error extracting trampoline_buffer");
+ return 0;
+ }
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
+ &trampoline_buffer_head))
+ {
+ fatal ("error extracting trampoline_buffer_end");
+ return 0;
+ }
+ }
+
+ /* Start claiming space from the top of the trampoline space. If
+ the space is located at the bottom of the virtual address space,
+ this reduces the possibility that corruption will occur if a null
+ pointer is used to write to memory. */
+ if (trampoline_buffer_head - trampoline_buffer_tail < used)
+ {
+ trace_debug ("claim_trampoline_space failed to reserve %s bytes",
+ pulongest (used));
+ return 0;
+ }
+
+ trampoline_buffer_head -= used;
+
+ trace_debug ("claim_trampoline_space reserves %s bytes at %s",
+ pulongest (used), paddress (trampoline_buffer_head));
+
+ *trampoline = trampoline_buffer_head;
+ return 1;
+}
+
+/* Returns non-zero if there is space allocated for use in trampolines
+ for fast tracepoints. */
+
+int
+have_fast_tracepoint_trampoline_buffer (char *buf)
+{
+ CORE_ADDR trampoline_end, errbuf;
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
+ &trampoline_end))
+ {
+ fatal ("error extracting trampoline_buffer_end");
+ return 0;
+ }
+
+ if (buf)
+ {
+ buf[0] = '\0';
+ strcpy (buf, "was claiming");
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error,
+ &errbuf))
+ {
+ fatal ("error extracting errbuf");
+ return 0;
+ }
+
+ read_inferior_memory (errbuf, (unsigned char *) buf, 100);
+ }
+
+ return trampoline_end != 0;
+}
+
+/* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
+ the command fails, or 0 otherwise. If the command ran
+ successfully, but probing the marker failed, ERROUT will be filled
+ with the error to reply to GDB, and -1 is also returned. This
+ allows directly passing IPA errors to GDB. */
+
+static int
+probe_marker_at (CORE_ADDR address, char *errout)
+{
+ char cmd[IPA_CMD_BUF_SIZE];
+ int err;
+
+ sprintf (cmd, "probe_marker_at:%s", paddress (address));
+ err = run_inferior_command (cmd, strlen (cmd) + 1);
+
+ if (err == 0)
+ {
+ if (*cmd == 'E')
+ {
+ strcpy (errout, cmd);
+ return -1;
+ }
+ }
+
+ return err;
+}
+
+static void
+clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from)
+{
+ to->jump_pad = from->jump_pad;
+ to->jump_pad_end = from->jump_pad_end;
+ to->trampoline = from->trampoline;
+ to->trampoline_end = from->trampoline_end;
+ to->adjusted_insn_addr = from->adjusted_insn_addr;
+ to->adjusted_insn_addr_end = from->adjusted_insn_addr_end;
+ to->handle = from->handle;
+
+ gdb_assert (from->handle);
+ inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle);
+}
+
+#define MAX_JUMP_SIZE 20
+
+/* Install fast tracepoint. Return 0 if successful, otherwise return
+ non-zero. */
+
+static int
+install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf)
+{
+ CORE_ADDR jentry, jump_entry;
+ CORE_ADDR trampoline;
+ ULONGEST trampoline_size;
+ int err = 0;
+ /* The jump to the jump pad of the last fast tracepoint
+ installed. */
+ unsigned char fjump[MAX_JUMP_SIZE];
+ ULONGEST fjump_size;
+
+ if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ())
+ {
+ trace_debug ("Requested a fast tracepoint on an instruction "
+ "that is of less than the minimum length.");
+ return 0;
+ }
+
+ jentry = jump_entry = get_jump_space_head ();
+
+ trampoline = 0;
+ trampoline_size = 0;
+
+ /* Install the jump pad. */
+ err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target,
+ tpoint->address,
+ ipa_sym_addrs.addr_gdb_collect,
+ ipa_sym_addrs.addr_collecting,
+ tpoint->orig_size,
+ &jentry,
+ &trampoline, &trampoline_size,
+ fjump, &fjump_size,
+ &tpoint->adjusted_insn_addr,
+ &tpoint->adjusted_insn_addr_end,
+ errbuf);
+
+ if (err)
+ return 1;
+
+ /* Wire it in. */
+ tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump,
+ fjump_size);
+
+ if (tpoint->handle != NULL)
+ {
+ tpoint->jump_pad = jump_entry;
+ tpoint->jump_pad_end = jentry;
+ tpoint->trampoline = trampoline;
+ tpoint->trampoline_end = trampoline + trampoline_size;
+
+ /* Pad to 8-byte alignment. */
+ jentry = ((jentry + 7) & ~0x7);
+ claim_jump_space (jentry - jump_entry);
+ }
+
+ return 0;
+}
+
+
+/* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
+
+static void
+install_tracepoint (struct tracepoint *tpoint, char *own_buf)
+{
+ tpoint->handle = NULL;
+ *own_buf = '\0';
+
+ if (tpoint->type == trap_tracepoint)
+ {
+ /* Tracepoints are installed as memory breakpoints. Just go
+ ahead and install the trap. The breakpoints module
+ handles duplicated breakpoints, and the memory read
+ routine handles un-patching traps from memory reads. */
+ tpoint->handle = set_breakpoint_at (tpoint->address,
+ tracepoint_handler);
+ }
+ else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint)
+ {
+ if (!agent_loaded_p ())
+ {
+ trace_debug ("Requested a %s tracepoint, but fast "
+ "tracepoints aren't supported.",
+ tpoint->type == static_tracepoint ? "static" : "fast");
+ write_e_ipa_not_loaded (own_buf);
+ return;
+ }
+ if (tpoint->type == static_tracepoint
+ && !in_process_agent_supports_ust ())
+ {
+ trace_debug ("Requested a static tracepoint, but static "
+ "tracepoints are not supported.");
+ write_e_ust_not_loaded (own_buf);
+ return;
+ }
+
+ if (tpoint->type == fast_tracepoint)
+ install_fast_tracepoint (tpoint, own_buf);
+ else
+ {
+ if (probe_marker_at (tpoint->address, own_buf) == 0)
+ tpoint->handle = (void *) -1;
+ }
+
+ }
+ else
+ internal_error (__FILE__, __LINE__, "Unknown tracepoint type");
+
+ if (tpoint->handle == NULL)
+ {
+ if (*own_buf == '\0')
+ write_enn (own_buf);
+ }
+ else
+ write_ok (own_buf);
+}
+
+static void download_tracepoint_1 (struct tracepoint *tpoint);
+
static void
cmd_qtstart (char *packet)
{
- struct tracepoint *tpoint;
- int slow_tracepoint_count;
+ struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint;
+ CORE_ADDR tpptr = 0, prev_tpptr = 0;
trace_debug ("Starting the trace");
- slow_tracepoint_count = 0;
+ /* Pause all threads temporarily while we patch tracepoints. */
+ pause_all (0);
+
+ /* Get threads out of jump pads. Safe to do here, since this is a
+ top level command. And, required to do here, since we're
+ deleting/rewriting jump pads. */
+
+ stabilize_threads ();
+
+ /* Freeze threads. */
+ pause_all (1);
+
+ /* Sync the fast tracepoints list in the inferior ftlib. */
+ if (agent_loaded_p ())
+ download_trace_state_variables ();
+
+ /* No previous fast tpoint yet. */
+ prev_ftpoint = NULL;
+
+ /* No previous static tpoint yet. */
+ prev_stpoint = NULL;
*packet = '\0';
- /* Install tracepoints. */
+ /* Start out empty. */
+ if (agent_loaded_p ())
+ write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0);
+
+ /* Download and install tracepoints. */
for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
{
/* Ensure all the hit counts start at zero. */
tpoint->hit_count = 0;
+ tpoint->traceframe_usage = 0;
- if (!tpoint->enabled)
- continue;
+ if (tpoint->type == trap_tracepoint)
+ {
+ /* Tracepoints are installed as memory breakpoints. Just go
+ ahead and install the trap. The breakpoints module
+ handles duplicated breakpoints, and the memory read
+ routine handles un-patching traps from memory reads. */
+ tpoint->handle = set_breakpoint_at (tpoint->address,
+ tracepoint_handler);
+ }
+ else if (tpoint->type == fast_tracepoint
+ || tpoint->type == static_tracepoint)
+ {
+ if (maybe_write_ipa_not_loaded (packet))
+ {
+ trace_debug ("Requested a %s tracepoint, but fast "
+ "tracepoints aren't supported.",
+ tpoint->type == static_tracepoint
+ ? "static" : "fast");
+ break;
+ }
- ++slow_tracepoint_count;
+ if (tpoint->type == fast_tracepoint)
+ {
+ int use_agent_p
+ = use_agent && agent_capability_check (AGENT_CAPA_FAST_TRACE);
- /* Tracepoints are installed as memory breakpoints. Just go
- ahead and install the trap. The breakpoints module handles
- duplicated breakpoints, and the memory read routine handles
- un-patching traps from memory reads. */
- tpoint->handle = set_breakpoint_at (tpoint->address, tracepoint_handler);
+ if (prev_ftpoint != NULL
+ && prev_ftpoint->address == tpoint->address)
+ {
+ if (use_agent_p)
+ tracepoint_send_agent (tpoint);
+ else
+ download_tracepoint_1 (tpoint);
+
+ clone_fast_tracepoint (tpoint, prev_ftpoint);
+ }
+ else
+ {
+ /* Tracepoint is installed successfully? */
+ int installed = 0;
+
+ /* Download and install fast tracepoint by agent. */
+ if (use_agent_p)
+ installed = !tracepoint_send_agent (tpoint);
+ else
+ {
+ download_tracepoint_1 (tpoint);
+ installed = !install_fast_tracepoint (tpoint, packet);
+ }
+
+ if (installed)
+ prev_ftpoint = tpoint;
+ }
+ }
+ else
+ {
+ if (!in_process_agent_supports_ust ())
+ {
+ trace_debug ("Requested a static tracepoint, but static "
+ "tracepoints are not supported.");
+ break;
+ }
- /* Any failure is sufficient cause to give up. */
+ download_tracepoint_1 (tpoint);
+ /* Can only probe a given marker once. */
+ if (prev_stpoint != NULL
+ && prev_stpoint->address == tpoint->address)
+ tpoint->handle = (void *) -1;
+ else
+ {
+ if (probe_marker_at (tpoint->address, packet) == 0)
+ {
+ tpoint->handle = (void *) -1;
+
+ /* So that we can handle multiple static tracepoints
+ at the same address easily. */
+ prev_stpoint = tpoint;
+ }
+ }
+ }
+
+ prev_tpptr = tpptr;
+ tpptr = tpoint->obj_addr_on_target;
+
+ if (tpoint == tracepoints)
+ /* First object in list, set the head pointer in the
+ inferior. */
+ write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr);
+ else
+ write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint,
+ next),
+ tpptr);
+ }
+
+ /* Any failure in the inner loop is sufficient cause to give
+ up. */
if (tpoint->handle == NULL)
break;
}
clear_installed_tracepoints ();
if (*packet == '\0')
write_enn (packet);
+ unpause_all (1);
return;
}
trace_buffer_is_full = 0;
expr_eval_result = expr_eval_no_error;
error_tracepoint = NULL;
+ tracing_start_time = get_timestamp ();
/* Tracing is now active, hits will now start being logged. */
tracing = 1;
+ if (agent_loaded_p ())
+ {
+ if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1))
+ fatal ("Error setting tracing variable in lib");
+
+ if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint,
+ 0))
+ fatal ("Error clearing stopping_tracepoint variable in lib");
+
+ if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0))
+ fatal ("Error clearing trace_buffer_is_full variable in lib");
+
+ stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing,
+ stop_tracing_handler);
+ if (stop_tracing_bkpt == NULL)
+ error ("Error setting stop_tracing breakpoint");
+
+ flush_trace_buffer_bkpt
+ = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer,
+ flush_trace_buffer_handler);
+ if (flush_trace_buffer_bkpt == NULL)
+ error ("Error setting flush_trace_buffer breakpoint");
+ }
+
+ unpause_all (1);
+
write_ok (packet);
}
trace_debug ("Stopping the trace");
+ /* Pause all threads before removing fast jumps from memory,
+ breakpoints, and touching IPA state variables (inferior memory).
+ Some thread may hit the internal tracing breakpoints, or be
+ collecting this moment, but that's ok, we don't release the
+ tpoint object's memory or the jump pads here (we only do that
+ when we're sure we can move all threads out of the jump pads).
+ We can't now, since we may be getting here due to the inferior
+ agent calling us. */
+ pause_all (1);
+ /* Since we're removing breakpoints, cancel breakpoint hits,
+ possibly related to the breakpoints we're about to delete. */
+ cancel_breakpoints ();
+
/* Stop logging. Tracepoints can still be hit, but they will not be
recorded. */
tracing = 0;
+ if (agent_loaded_p ())
+ {
+ if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0))
+ fatal ("Error clearing tracing variable in lib");
+ }
+ tracing_stop_time = get_timestamp ();
tracing_stop_reason = "t???";
tracing_stop_tpnum = 0;
if (stopping_tracepoint)
{
trace_debug ("Stopping the trace because "
- "tracepoint %d was hit %ld times",
+ "tracepoint %d was hit %" PRIu64 " times",
stopping_tracepoint->number,
stopping_tracepoint->pass_count);
tracing_stop_reason = "tpasscount";
tracing_stop_reason = eval_result_names[expr_eval_result];
tracing_stop_tpnum = error_tracepoint->number;
}
+#ifndef IN_PROCESS_AGENT
else if (!gdb_connected ())
{
trace_debug ("Stopping the trace because GDB disconnected");
tracing_stop_reason = "tdisconnected";
}
+#endif
else
{
trace_debug ("Stopping the trace because of a tstop command");
/* Clear out the tracepoints. */
clear_installed_tracepoints ();
+
+ if (agent_loaded_p ())
+ {
+ /* Pull in fast tracepoint trace frames from the inferior lib
+ buffer into our buffer, even if our buffer is already full,
+ because we want to present the full number of created frames
+ in addition to what fit in the trace buffer. */
+ upload_fast_traceframes ();
+ }
+
+ if (stop_tracing_bkpt != NULL)
+ {
+ delete_breakpoint (stop_tracing_bkpt);
+ stop_tracing_bkpt = NULL;
+ }
+
+ if (flush_trace_buffer_bkpt != NULL)
+ {
+ delete_breakpoint (flush_trace_buffer_bkpt);
+ flush_trace_buffer_bkpt = NULL;
+ }
+
+ unpause_all (1);
+}
+
+static int
+stop_tracing_handler (CORE_ADDR addr)
+{
+ trace_debug ("lib hit stop_tracing");
+
+ /* Don't actually handle it here. When we stop tracing we remove
+ breakpoints from the inferior, and that is not allowed in a
+ breakpoint handler (as the caller is walking the breakpoint
+ list). */
+ return 0;
+}
+
+static int
+flush_trace_buffer_handler (CORE_ADDR addr)
+{
+ trace_debug ("lib hit flush_trace_buffer");
+ return 0;
}
static void
if (strncmp (packet, "pc:", strlen ("pc:")) == 0)
{
packet += strlen ("pc:");
- packet = unpack_varlen_hex (packet, &pc);
+ unpack_varlen_hex (packet, &pc);
trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc));
tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum);
}
packet += strlen ("range:");
packet = unpack_varlen_hex (packet, &lo);
++packet;
- packet = unpack_varlen_hex (packet, &hi);
+ unpack_varlen_hex (packet, &hi);
trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
paddress (lo), paddress (hi));
tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum);
packet += strlen ("outside:");
packet = unpack_varlen_hex (packet, &lo);
++packet;
- packet = unpack_varlen_hex (packet, &hi);
+ unpack_varlen_hex (packet, &hi);
trace_debug ("Want to find next traceframe "
"outside the range 0x%s to 0x%s",
paddress (lo), paddress (hi));
else if (strncmp (packet, "tdp:", strlen ("tdp:")) == 0)
{
packet += strlen ("tdp:");
- packet = unpack_varlen_hex (packet, &num);
+ unpack_varlen_hex (packet, &num);
tpnum = (int) num;
trace_debug ("Want to find next traceframe for tracepoint %d", tpnum);
tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum);
cmd_qtstatus (char *packet)
{
char *stop_reason_rsp = NULL;
+ char *buf1, *buf2, *buf3, *str;
+ int slen;
+
+ /* Translate the plain text of the notes back into hex for
+ transmission. */
+
+ str = (tracing_user_name ? tracing_user_name : "");
+ slen = strlen (str);
+ buf1 = (char *) alloca (slen * 2 + 1);
+ bin2hex ((gdb_byte *) str, buf1, slen);
+
+ str = (tracing_notes ? tracing_notes : "");
+ slen = strlen (str);
+ buf2 = (char *) alloca (slen * 2 + 1);
+ bin2hex ((gdb_byte *) str, buf2, slen);
+
+ str = (tracing_stop_note ? tracing_stop_note : "");
+ slen = strlen (str);
+ buf3 = (char *) alloca (slen * 2 + 1);
+ bin2hex ((gdb_byte *) str, buf3, slen);
trace_debug ("Returning trace status as %d, stop reason %s",
tracing, tracing_stop_reason);
+ if (agent_loaded_p ())
+ {
+ pause_all (1);
+
+ upload_fast_traceframes ();
+
+ unpause_all (1);
+ }
+
stop_reason_rsp = (char *) tracing_stop_reason;
/* The user visible error string in terror needs to be hex encoded.
- We leave it as plain string in `tracepoint_stop_reason' to ease
+ We leave it as plain string in `tracing_stop_reason' to ease
debugging. */
if (strncmp (stop_reason_rsp, "terror:", strlen ("terror:")) == 0)
{
p = stop_reason_rsp = alloca (strlen ("terror:") + hexstr_len + 1);
strcpy (p, "terror:");
p += strlen (p);
- convert_int_to_ascii ((gdb_byte *) result_name, p, strlen (result_name));
+ bin2hex ((gdb_byte *) result_name, p, strlen (result_name));
+ }
+
+ /* If this was a forced stop, include any stop note that was supplied. */
+ if (strcmp (stop_reason_rsp, "tstop") == 0)
+ {
+ stop_reason_rsp = alloca (strlen ("tstop:") + strlen (buf3) + 1);
+ strcpy (stop_reason_rsp, "tstop:");
+ strcat (stop_reason_rsp, buf3);
}
sprintf (packet,
"tframes:%x;tcreated:%x;"
"tfree:%x;tsize:%s;"
"circular:%d;"
- "disconn:%d",
+ "disconn:%d;"
+ "starttime:%s;stoptime:%s;"
+ "username:%s;notes:%s:",
tracing ? 1 : 0,
stop_reason_rsp, tracing_stop_tpnum,
traceframe_count, traceframes_created,
free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0),
circular_trace_buffer,
- disconnected_tracing);
+ disconnected_tracing,
+ phex_nz (tracing_start_time, sizeof (tracing_start_time)),
+ phex_nz (tracing_stop_time, sizeof (tracing_stop_time)),
+ buf1, buf2);
+}
+
+static void
+cmd_qtp (char *own_buf)
+{
+ ULONGEST num, addr;
+ struct tracepoint *tpoint;
+ char *packet = own_buf;
+
+ packet += strlen ("qTP:");
+
+ packet = unpack_varlen_hex (packet, &num);
+ ++packet; /* skip a colon */
+ packet = unpack_varlen_hex (packet, &addr);
+
+ /* See if we already have this tracepoint. */
+ tpoint = find_tracepoint (num, addr);
+
+ if (!tpoint)
+ {
+ trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
+ (int) num, paddress (addr));
+ write_enn (own_buf);
+ return;
+ }
+
+ sprintf (own_buf, "V%" PRIu64 ":%" PRIu64 "", tpoint->hit_count,
+ tpoint->traceframe_usage);
}
/* State variables to help return all the tracepoint bits. */
static struct tracepoint *cur_tpoint;
-static int cur_action;
-static int cur_step_action;
+static unsigned int cur_action;
+static unsigned int cur_step_action;
static struct source_string *cur_source_string;
static struct trace_state_variable *cur_tsv;
{
char *buf;
- sprintf (packet, "T%x:%s:%c:%lx:%lx", tpoint->number,
+ sprintf (packet, "T%x:%s:%c:%" PRIx64 ":%" PRIx64, tpoint->number,
paddress (tpoint->address),
(tpoint->enabled ? 'E' : 'D'), tpoint->step_count,
tpoint->pass_count);
+ if (tpoint->type == fast_tracepoint)
+ sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size);
+ else if (tpoint->type == static_tracepoint)
+ sprintf (packet + strlen (packet), ":S");
if (tpoint->cond)
{
- buf = unparse_agent_expr (tpoint->cond);
+ buf = gdb_unparse_agent_expr (tpoint->cond);
sprintf (packet + strlen (packet), ":X%x,%s",
tpoint->cond->length, buf);
free (buf);
len = strlen (src->str);
buf = alloca (len * 2 + 1);
- convert_int_to_ascii ((gdb_byte *) src->str, buf, len);
+ bin2hex ((gdb_byte *) src->str, buf, len);
sprintf (packet, "Z%x:%s:%s:%x:%x:%s",
tpoint->number, paddress (tpoint->address),
trace_debug ("Returning first tracepoint definition piece");
cur_tpoint = tracepoints;
- cur_action = cur_step_action = -1;
+ cur_action = cur_step_action = 0;
cur_source_string = NULL;
if (cur_tpoint)
GDB misbehavior. */
strcpy (packet, "l");
}
- else if (cur_action < cur_tpoint->numactions - 1)
+ else if (cur_action < cur_tpoint->numactions)
{
- ++cur_action;
response_action (packet, cur_tpoint,
cur_tpoint->actions_str[cur_action], 0);
+ ++cur_action;
}
- else if (cur_step_action < cur_tpoint->num_step_actions - 1)
+ else if (cur_step_action < cur_tpoint->num_step_actions)
{
- ++cur_step_action;
response_action (packet, cur_tpoint,
cur_tpoint->step_actions_str[cur_step_action], 1);
+ ++cur_step_action;
}
else if ((cur_source_string
? cur_source_string->next
else
{
cur_tpoint = cur_tpoint->next;
- cur_action = cur_step_action = -1;
+ cur_action = cur_step_action = 0;
cur_source_string = NULL;
if (cur_tpoint)
response_tracepoint (packet, cur_tpoint);
{
namelen = strlen (tsv->name);
buf = alloca (namelen * 2 + 1);
- convert_int_to_ascii ((gdb_byte *) tsv->name, buf, namelen);
+ bin2hex ((gdb_byte *) tsv->name, buf, namelen);
}
sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0),
static void
cmd_qtsv (char *packet)
{
- trace_debug ("Returning first trace state variable definition");
+ trace_debug ("Returning additional trace state variable definition");
- if (!cur_tpoint)
- {
- /* This case would normally never occur, but be prepared for
- GDB misbehavior. */
- strcpy (packet, "l");
- }
- else if (cur_tsv)
+ if (cur_tsv)
{
cur_tsv = cur_tsv->next;
if (cur_tsv)
strcpy (packet, "l");
}
+/* Return the first static tracepoint marker, and initialize the state
+ machine that will iterate through all the static tracepoints
+ markers. */
+
+static void
+cmd_qtfstm (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet, strlen (packet) + 1);
+}
+
+/* Return additional static tracepoints markers. */
+
+static void
+cmd_qtsstm (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet, strlen (packet) + 1);
+}
+
+/* Return the definition of the static tracepoint at a given address.
+ Result packet is the same as qTsST's. */
+
+static void
+cmd_qtstmat (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet, strlen (packet) + 1);
+}
+
+/* Sent the agent a command to close it. */
+
+void
+gdb_agent_about_to_close (int pid)
+{
+ char buf[IPA_CMD_BUF_SIZE];
+
+ if (!maybe_write_ipa_not_loaded (buf))
+ {
+ struct thread_info *save_inferior;
+ struct inferior_list_entry *inf = all_threads.head;
+
+ save_inferior = current_inferior;
+
+ /* Find a certain thread which belongs to process PID. */
+ while (inf != NULL)
+ {
+ if (ptid_get_pid (inf->id) == pid)
+ break;
+ inf = inf->next;
+ }
+
+ current_inferior = (struct thread_info *) inf;
+
+ strcpy (buf, "close");
+
+ run_inferior_command (buf, strlen (buf) + 1);
+
+ current_inferior = save_inferior;
+ }
+}
+
+/* Return the minimum instruction size needed for fast tracepoints as a
+ hexadecimal number. */
+
+static void
+cmd_qtminftpilen (char *packet)
+{
+ if (current_inferior == NULL)
+ {
+ /* Indicate that the minimum length is currently unknown. */
+ strcpy (packet, "0");
+ return;
+ }
+
+ sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ());
+}
+
/* Respond to qTBuffer packet with a block of raw data from the trace
buffer. GDB may ask for a lot, but we are allowed to reply with
only as much as will fit within packet limits or whatever. */
packet = unpack_varlen_hex (packet, &offset);
++packet; /* skip a comma */
- packet = unpack_varlen_hex (packet, &num);
+ unpack_varlen_hex (packet, &num);
trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
- (int) num, pulongest (offset));
+ (int) num, phex_nz (offset, 0));
tot = (trace_buffer_hi - trace_buffer_lo) - free_space ();
if (num >= (PBUFSIZ - 16) / 2 )
num = (PBUFSIZ - 16) / 2;
- convert_int_to_ascii (tbp, own_buf, num);
- own_buf[num] = '\0';
+ bin2hex (tbp, own_buf, num);
}
static void
-cmd_bigqtbuffer (char *own_buf)
+cmd_bigqtbuffer_circular (char *own_buf)
{
ULONGEST val;
char *packet = own_buf;
- packet += strlen ("QTBuffer:");
+ packet += strlen ("QTBuffer:circular:");
+
+ unpack_varlen_hex (packet, &val);
+ circular_trace_buffer = val;
+ trace_debug ("Trace buffer is now %s",
+ circular_trace_buffer ? "circular" : "linear");
+ write_ok (own_buf);
+}
+
+static void
+cmd_bigqtbuffer_size (char *own_buf)
+{
+ ULONGEST val;
+ LONGEST sval;
+ char *packet = own_buf;
- if (strncmp ("circular:", packet, strlen ("circular:")) == 0)
+ /* Can't change the size during a tracing run. */
+ if (tracing)
{
- packet += strlen ("circular:");
- packet = unpack_varlen_hex (packet, &val);
- circular_trace_buffer = val;
- trace_debug ("Trace buffer is now %s",
- circular_trace_buffer ? "circular" : "linear");
- write_ok (own_buf);
+ write_enn (own_buf);
+ return;
}
+
+ packet += strlen ("QTBuffer:size:");
+
+ /* -1 is sent as literal "-1". */
+ if (strcmp (packet, "-1") == 0)
+ sval = DEFAULT_TRACE_BUFFER_SIZE;
else
- write_enn (own_buf);
+ {
+ unpack_varlen_hex (packet, &val);
+ sval = (LONGEST) val;
+ }
+
+ init_trace_buffer (sval);
+ trace_debug ("Trace buffer is now %s bytes",
+ plongest (trace_buffer_size));
+ write_ok (own_buf);
+}
+
+static void
+cmd_qtnotes (char *own_buf)
+{
+ size_t nbytes;
+ char *saved, *user, *notes, *stopnote;
+ char *packet = own_buf;
+
+ packet += strlen ("QTNotes:");
+
+ while (*packet)
+ {
+ if (strncmp ("user:", packet, strlen ("user:")) == 0)
+ {
+ packet += strlen ("user:");
+ saved = packet;
+ packet = strchr (packet, ';');
+ nbytes = (packet - saved) / 2;
+ user = xmalloc (nbytes + 1);
+ nbytes = hex2bin (saved, (gdb_byte *) user, nbytes);
+ user[nbytes] = '\0';
+ ++packet; /* skip the semicolon */
+ trace_debug ("User is '%s'", user);
+ xfree (tracing_user_name);
+ tracing_user_name = user;
+ }
+ else if (strncmp ("notes:", packet, strlen ("notes:")) == 0)
+ {
+ packet += strlen ("notes:");
+ saved = packet;
+ packet = strchr (packet, ';');
+ nbytes = (packet - saved) / 2;
+ notes = xmalloc (nbytes + 1);
+ nbytes = hex2bin (saved, (gdb_byte *) notes, nbytes);
+ notes[nbytes] = '\0';
+ ++packet; /* skip the semicolon */
+ trace_debug ("Notes is '%s'", notes);
+ xfree (tracing_notes);
+ tracing_notes = notes;
+ }
+ else if (strncmp ("tstop:", packet, strlen ("tstop:")) == 0)
+ {
+ packet += strlen ("tstop:");
+ saved = packet;
+ packet = strchr (packet, ';');
+ nbytes = (packet - saved) / 2;
+ stopnote = xmalloc (nbytes + 1);
+ nbytes = hex2bin (saved, (gdb_byte *) stopnote, nbytes);
+ stopnote[nbytes] = '\0';
+ ++packet; /* skip the semicolon */
+ trace_debug ("tstop note is '%s'", stopnote);
+ xfree (tracing_stop_note);
+ tracing_stop_note = stopnote;
+ }
+ else
+ break;
+ }
+
+ write_ok (own_buf);
}
int
cmd_qtdpsrc (packet);
return 1;
}
+ else if (strncmp ("QTEnable:", packet, strlen ("QTEnable:")) == 0)
+ {
+ cmd_qtenable_disable (packet, 1);
+ return 1;
+ }
+ else if (strncmp ("QTDisable:", packet, strlen ("QTDisable:")) == 0)
+ {
+ cmd_qtenable_disable (packet, 0);
+ return 1;
+ }
else if (strncmp ("QTDV:", packet, strlen ("QTDV:")) == 0)
{
cmd_qtdv (packet);
cmd_qtframe (packet);
return 1;
}
- else if (strncmp ("QTBuffer:", packet, strlen ("QTBuffer:")) == 0)
+ else if (strncmp ("QTBuffer:circular:", packet, strlen ("QTBuffer:circular:")) == 0)
{
- cmd_bigqtbuffer (packet);
+ cmd_bigqtbuffer_circular (packet);
+ return 1;
+ }
+ else if (strncmp ("QTBuffer:size:", packet, strlen ("QTBuffer:size:")) == 0)
+ {
+ cmd_bigqtbuffer_size (packet);
+ return 1;
+ }
+ else if (strncmp ("QTNotes:", packet, strlen ("QTNotes:")) == 0)
+ {
+ cmd_qtnotes (packet);
return 1;
}
cmd_qtstatus (packet);
return 1;
}
+ else if (strncmp ("qTP:", packet, strlen ("qTP:")) == 0)
+ {
+ cmd_qtp (packet);
+ return 1;
+ }
else if (strcmp ("qTfP", packet) == 0)
{
cmd_qtfp (packet);
cmd_qtbuffer (packet);
return 1;
}
+ else if (strcmp ("qTfSTM", packet) == 0)
+ {
+ cmd_qtfstm (packet);
+ return 1;
+ }
+ else if (strcmp ("qTsSTM", packet) == 0)
+ {
+ cmd_qtsstm (packet);
+ return 1;
+ }
+ else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0)
+ {
+ cmd_qtstmat (packet);
+ return 1;
+ }
+ else if (strcmp ("qTMinFTPILen", packet) == 0)
+ {
+ cmd_qtminftpilen (packet);
+ return 1;
+ }
return 0;
}
+#endif
+#ifndef IN_PROCESS_AGENT
+
/* Call this when thread TINFO has hit the tracepoint defined by
TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
action. This adds a while-stepping collecting state item to the
struct wstep_state **wstep_link;
struct trap_tracepoint_ctx ctx;
+ /* Pull in fast tracepoint trace frames from the inferior lib buffer into
+ our buffer. */
+ if (agent_loaded_p ())
+ upload_fast_traceframes ();
+
/* Check if we were indeed collecting data for one of more
tracepoints with a 'while-stepping' count. */
if (tinfo->while_stepping == NULL)
target_pid_to_str (tinfo->entry.id),
wstep->tp_number, paddress (wstep->tp_address));
+ ctx.base.type = trap_tracepoint;
ctx.regcache = get_thread_regcache (tinfo, 1);
while (wstep != NULL)
/* Unlink. */
*wstep_link = wstep->next;
release_while_stepping_state (wstep);
+ wstep = *wstep_link;
continue;
}
return 1;
}
+/* Handle any internal tracing control breakpoint hits. That means,
+ pull traceframes from the IPA to our buffer, and syncing both
+ tracing agents when the IPA's tracing stops for some reason. */
+
+int
+handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc)
+{
+ /* Pull in fast tracepoint trace frames from the inferior in-process
+ agent's buffer into our buffer. */
+
+ if (!agent_loaded_p ())
+ return 0;
+
+ upload_fast_traceframes ();
+
+ /* Check if the in-process agent had decided we should stop
+ tracing. */
+ if (stop_pc == ipa_sym_addrs.addr_stop_tracing)
+ {
+ int ipa_trace_buffer_is_full;
+ CORE_ADDR ipa_stopping_tracepoint;
+ int ipa_expr_eval_result;
+ CORE_ADDR ipa_error_tracepoint;
+
+ trace_debug ("lib stopped at stop_tracing");
+
+ read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full,
+ &ipa_trace_buffer_is_full);
+
+ read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint,
+ &ipa_stopping_tracepoint);
+ write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0);
+
+ read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint,
+ &ipa_error_tracepoint);
+ write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0);
+
+ read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result,
+ &ipa_expr_eval_result);
+ write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0);
+
+ trace_debug ("lib: trace_buffer_is_full: %d, "
+ "stopping_tracepoint: %s, "
+ "ipa_expr_eval_result: %d, "
+ "error_tracepoint: %s, ",
+ ipa_trace_buffer_is_full,
+ paddress (ipa_stopping_tracepoint),
+ ipa_expr_eval_result,
+ paddress (ipa_error_tracepoint));
+
+ if (debug_threads)
+ {
+ if (ipa_trace_buffer_is_full)
+ trace_debug ("lib stopped due to full buffer.");
+ if (ipa_stopping_tracepoint)
+ trace_debug ("lib stopped due to tpoint");
+ if (ipa_stopping_tracepoint)
+ trace_debug ("lib stopped due to error");
+ }
+
+ if (ipa_stopping_tracepoint != 0)
+ {
+ stopping_tracepoint
+ = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint);
+ }
+ else if (ipa_expr_eval_result != expr_eval_no_error)
+ {
+ expr_eval_result = ipa_expr_eval_result;
+ error_tracepoint
+ = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint);
+ }
+ stop_tracing ();
+ return 1;
+ }
+ else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer)
+ {
+ trace_debug ("lib stopped at flush_trace_buffer");
+ return 1;
+ }
+
+ return 0;
+}
+
/* Return true if TINFO just hit a tracepoint. Collect data if
so. */
if (!tracing)
return 0;
+ ctx.base.type = trap_tracepoint;
ctx.regcache = get_thread_regcache (tinfo, 1);
for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
{
- if (tpoint->enabled && stop_pc == tpoint->address)
+ /* Note that we collect fast tracepoints here as well. We'll
+ step over the fast tracepoint jump later, which avoids the
+ double collect. However, we don't collect for static
+ tracepoints here, because UST markers are compiled in program,
+ and probes will be executed in program. So static tracepoints
+ are collected there. */
+ if (tpoint->enabled && stop_pc == tpoint->address
+ && tpoint->type != static_tracepoint)
{
trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
target_pid_to_str (tinfo->entry.id),
return ret;
}
+#endif
+
+#if defined IN_PROCESS_AGENT && defined HAVE_UST
+struct ust_marker_data;
+static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
+ struct traceframe *tframe);
+#endif
+
/* Create a trace frame for the hit of the given tracepoint in the
given thread. */
&& stopping_tracepoint == NULL)
stopping_tracepoint = tpoint;
- trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %ld",
+ trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64,
tpoint->number, paddress (tpoint->address), tpoint->hit_count);
tframe = add_traceframe (tpoint);
{
for (acti = 0; acti < tpoint->numactions; ++acti)
{
+#ifndef IN_PROCESS_AGENT
trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
tpoint->number, paddress (tpoint->address),
tpoint->actions_str[acti]);
+#endif
do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe,
tpoint->actions[acti]);
trace_buffer_is_full = 1;
}
+#ifndef IN_PROCESS_AGENT
+
static void
collect_data_at_step (struct tracepoint_hit_ctx *ctx,
CORE_ADDR stop_pc,
int acti;
trace_debug ("Making new step traceframe for "
- "tracepoint %d at 0x%s, step %d of %ld, hit %ld",
+ "tracepoint %d at 0x%s, step %d of %" PRIu64 ", hit %" PRIu64,
tpoint->number, paddress (tpoint->address),
current_step, tpoint->step_count,
tpoint->hit_count);
trace_buffer_is_full = 1;
}
+#endif
+
+#ifdef IN_PROCESS_AGENT
+/* The target description used by the IPA. Given that the IPA library
+ is built for a specific architecture that is loaded into the
+ inferior, there only needs to be one such description per
+ build. */
+const struct target_desc *ipa_tdesc;
+#endif
+
static struct regcache *
get_context_regcache (struct tracepoint_hit_ctx *ctx)
{
- struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx;
- struct regcache *regcache = tctx->regcache;
+ struct regcache *regcache = NULL;
+
+#ifdef IN_PROCESS_AGENT
+ if (ctx->type == fast_tracepoint)
+ {
+ struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx;
+ if (!fctx->regcache_initted)
+ {
+ fctx->regcache_initted = 1;
+ init_register_cache (&fctx->regcache, ipa_tdesc, fctx->regspace);
+ supply_regblock (&fctx->regcache, NULL);
+ supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs);
+ }
+ regcache = &fctx->regcache;
+ }
+#ifdef HAVE_UST
+ if (ctx->type == static_tracepoint)
+ {
+ struct static_tracepoint_ctx *sctx
+ = (struct static_tracepoint_ctx *) ctx;
+
+ if (!sctx->regcache_initted)
+ {
+ sctx->regcache_initted = 1;
+ init_register_cache (&sctx->regcache, ipa_tdesc, sctx->regspace);
+ supply_regblock (&sctx->regcache, NULL);
+ /* Pass down the tracepoint address, because REGS doesn't
+ include the PC, but we know what it must have been. */
+ supply_static_tracepoint_registers (&sctx->regcache,
+ (const unsigned char *)
+ sctx->regs,
+ sctx->tpoint->address);
+ }
+ regcache = &sctx->regcache;
+ }
+#endif
+#else
+ if (ctx->type == trap_tracepoint)
+ {
+ struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx;
+ regcache = tctx->regcache;
+ }
+#endif
gdb_assert (regcache != NULL);
case 'M':
{
struct collect_memory_action *maction;
+ struct eval_agent_expr_context ax_ctx;
maction = (struct collect_memory_action *) taction;
+ ax_ctx.regcache = NULL;
+ ax_ctx.tframe = tframe;
+ ax_ctx.tpoint = tpoint;
trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
pulongest (maction->len),
paddress (maction->addr), maction->basereg);
/* (should use basereg) */
- agent_mem_read (tframe, NULL,
- (CORE_ADDR) maction->addr, maction->len);
+ agent_mem_read (&ax_ctx, NULL, (CORE_ADDR) maction->addr,
+ maction->len);
break;
}
case 'R':
{
- struct collect_registers_action *raction;
-
unsigned char *regspace;
struct regcache tregcache;
struct regcache *context_regcache;
-
- raction = (struct collect_registers_action *) taction;
+ int regcache_size;
trace_debug ("Want to collect registers");
+ context_regcache = get_context_regcache (ctx);
+ regcache_size = register_cache_size (context_regcache->tdesc);
+
/* Collect all registers for now. */
- regspace = add_traceframe_block (tframe,
- 1 + register_cache_size ());
+ regspace = add_traceframe_block (tframe, tpoint, 1 + regcache_size);
if (regspace == NULL)
{
trace_debug ("Trace buffer block allocation failed, skipping");
/* Identify a register block. */
*regspace = 'R';
- context_regcache = get_context_regcache (ctx);
-
/* Wrap the regblock in a register cache (in the stack, we
don't want to malloc here). */
- init_register_cache (&tregcache, regspace + 1);
+ init_register_cache (&tregcache, context_regcache->tdesc,
+ regspace + 1);
/* Copy the register data to the regblock. */
regcache_cpy (&tregcache, context_regcache);
+#ifndef IN_PROCESS_AGENT
/* On some platforms, trap-based tracepoints will have the PC
pointing to the next instruction after the trap, but we
don't want the user or GDB trying to guess whether the
saved PC needs adjusting; so always record the adjusted
stop_pc. Note that we can't use tpoint->address instead,
- since it will be wrong for while-stepping actions. */
+ since it will be wrong for while-stepping actions. This
+ adjustment is a nop for fast tracepoints collected from the
+ in-process lib (but not if GDBserver is collecting one
+ preemptively), since the PC had already been adjusted to
+ contain the tracepoint's address by the jump pad. */
trace_debug ("Storing stop pc (0x%s) in regblock",
- paddress (tpoint->address));
+ paddress (stop_pc));
/* This changes the regblock, not the thread's
regcache. */
regcache_write_pc (&tregcache, stop_pc);
+#endif
}
break;
case 'X':
{
struct eval_expr_action *eaction;
+ struct eval_agent_expr_context ax_ctx;
eaction = (struct eval_expr_action *) taction;
+ ax_ctx.regcache = get_context_regcache (ctx);
+ ax_ctx.tframe = tframe;
+ ax_ctx.tpoint = tpoint;
trace_debug ("Want to evaluate expression");
- err = eval_agent_expr (ctx, tframe, eaction->expr, NULL);
+ err = gdb_eval_agent_expr (&ax_ctx, eaction->expr, NULL);
if (err != expr_eval_no_error)
{
}
}
break;
+ case 'L':
+ {
+#if defined IN_PROCESS_AGENT && defined HAVE_UST
+ trace_debug ("Want to collect static trace data");
+ collect_ust_data_at_tracepoint (ctx, tframe);
+#else
+ trace_debug ("warning: collecting static trace data, "
+ "but static tracepoints are not supported");
+#endif
+ }
+ break;
default:
trace_debug ("unknown trace action '%c', ignoring", taction->type);
break;
ULONGEST value = 0;
enum eval_result_type err;
- err = eval_agent_expr (ctx, NULL, tpoint->cond, &value);
+ /* Presently, gdbserver doesn't run compiled conditions, only the
+ IPA does. If the program stops at a fast tracepoint's address
+ (e.g., due to a breakpoint, trap tracepoint, or stepping),
+ gdbserver preemptively collect the fast tracepoint. Later, on
+ resume, gdbserver steps over the fast tracepoint like it steps
+ over breakpoints, so that the IPA doesn't see that fast
+ tracepoint. This avoids double collects of fast tracepoints in
+ that stopping scenario. Having gdbserver itself handle the fast
+ tracepoint gives the user a consistent view of when fast or trap
+ tracepoints are collected, compared to an alternative where only
+ trap tracepoints are collected on stop, and fast tracepoints on
+ resume. When a fast tracepoint is being processed by gdbserver,
+ it is always the non-compiled condition expression that is
+ used. */
+#ifdef IN_PROCESS_AGENT
+ if (tpoint->compiled_cond)
+ err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (ctx, &value);
+ else
+#endif
+ {
+ struct eval_agent_expr_context ax_ctx;
+
+ ax_ctx.regcache = get_context_regcache (ctx);
+ ax_ctx.tframe = NULL;
+ ax_ctx.tpoint = tpoint;
+ err = gdb_eval_agent_expr (&ax_ctx, tpoint->cond, &value);
+ }
if (err != expr_eval_no_error)
{
record_tracepoint_error (tpoint, "condition", err);
return (value ? 1 : 0);
}
-/* The packet form of an agent expression consists of an 'X', number
- of bytes in expression, a comma, and then the bytes. */
+/* Do memory copies for bytecodes. */
+/* Do the recording of memory blocks for actions and bytecodes. */
-static struct agent_expr *
-parse_agent_expr (char **actparm)
+int
+agent_mem_read (struct eval_agent_expr_context *ctx,
+ unsigned char *to, CORE_ADDR from, ULONGEST len)
{
- char *act = *actparm;
- ULONGEST xlen;
- struct agent_expr *aexpr;
-
- ++act; /* skip the X */
- act = unpack_varlen_hex (act, &xlen);
- ++act; /* skip a comma */
- aexpr = xmalloc (sizeof (struct agent_expr));
- aexpr->length = xlen;
- aexpr->bytes = xmalloc (xlen);
- convert_ascii_to_int (act, aexpr->bytes, xlen);
- *actparm = act + (xlen * 2);
- return aexpr;
-}
+ unsigned char *mspace;
+ ULONGEST remaining = len;
+ unsigned short blocklen;
-/* Convert the bytes of an agent expression back into hex digits, so
- they can be printed or uploaded. This allocates the buffer,
- callers should free when they are done with it. */
+ /* If a 'to' buffer is specified, use it. */
+ if (to != NULL)
+ {
+ read_inferior_memory (from, to, len);
+ return 0;
+ }
-static char *
-unparse_agent_expr (struct agent_expr *aexpr)
-{
- char *rslt;
-
- rslt = xmalloc (2 * aexpr->length + 1);
- convert_int_to_ascii (aexpr->bytes, rslt, aexpr->length);
- return rslt;
-}
-
-/* The agent expression evaluator, as specified by the GDB docs. It
- returns 0 if everything went OK, and a nonzero error code
- otherwise. */
-
-static enum eval_result_type
-eval_agent_expr (struct tracepoint_hit_ctx *ctx,
- struct traceframe *tframe,
- struct agent_expr *aexpr,
- ULONGEST *rslt)
-{
- int pc = 0;
-#define STACK_MAX 100
- ULONGEST stack[STACK_MAX], top;
- int sp = 0;
- unsigned char op;
- int arg;
-
- /* This union is a convenient way to convert representations. For
- now, assume a standard architecture where the hardware integer
- types have 8, 16, 32, 64 bit types. A more robust solution would
- be to import stdint.h from gnulib. */
- union
- {
- union
- {
- unsigned char bytes[1];
- unsigned char val;
- } u8;
- union
- {
- unsigned char bytes[2];
- unsigned short val;
- } u16;
- union
- {
- unsigned char bytes[4];
- unsigned int val;
- } u32;
- union
- {
- unsigned char bytes[8];
- ULONGEST val;
- } u64;
- } cnv;
-
- if (aexpr->length == 0)
- {
- trace_debug ("empty agent expression");
- return expr_eval_empty_expression;
- }
-
- /* Cache the stack top in its own variable. Much of the time we can
- operate on this variable, rather than dinking with the stack. It
- needs to be copied to the stack when sp changes. */
- top = 0;
-
- while (1)
+ /* Otherwise, create a new memory block in the trace buffer. */
+ while (remaining > 0)
{
- op = aexpr->bytes[pc++];
-
- trace_debug ("About to interpret byte 0x%x", op);
-
- switch (op)
- {
- case gdb_agent_op_add:
- top += stack[--sp];
- break;
-
- case gdb_agent_op_sub:
- top = stack[--sp] - top;
- break;
-
- case gdb_agent_op_mul:
- top *= stack[--sp];
- break;
-
- case gdb_agent_op_div_signed:
- if (top == 0)
- {
- trace_debug ("Attempted to divide by zero");
- return expr_eval_divide_by_zero;
- }
- top = ((LONGEST) stack[--sp]) / ((LONGEST) top);
- break;
-
- case gdb_agent_op_div_unsigned:
- if (top == 0)
- {
- trace_debug ("Attempted to divide by zero");
- return expr_eval_divide_by_zero;
- }
- top = stack[--sp] / top;
- break;
-
- case gdb_agent_op_rem_signed:
- if (top == 0)
- {
- trace_debug ("Attempted to divide by zero");
- return expr_eval_divide_by_zero;
- }
- top = ((LONGEST) stack[--sp]) % ((LONGEST) top);
- break;
-
- case gdb_agent_op_rem_unsigned:
- if (top == 0)
- {
- trace_debug ("Attempted to divide by zero");
- return expr_eval_divide_by_zero;
- }
- top = stack[--sp] % top;
- break;
-
- case gdb_agent_op_lsh:
- top = stack[--sp] << top;
- break;
-
- case gdb_agent_op_rsh_signed:
- top = ((LONGEST) stack[--sp]) >> top;
- break;
-
- case gdb_agent_op_rsh_unsigned:
- top = stack[--sp] >> top;
- break;
-
- case gdb_agent_op_trace:
- agent_mem_read (tframe,
- NULL, (CORE_ADDR) stack[--sp], (ULONGEST) top);
- if (--sp >= 0)
- top = stack[sp];
- break;
-
- case gdb_agent_op_trace_quick:
- arg = aexpr->bytes[pc++];
- agent_mem_read (tframe, NULL, (CORE_ADDR) top, (ULONGEST) arg);
- break;
-
- case gdb_agent_op_log_not:
- top = !top;
- break;
-
- case gdb_agent_op_bit_and:
- top &= stack[--sp];
- break;
-
- case gdb_agent_op_bit_or:
- top |= stack[--sp];
- break;
-
- case gdb_agent_op_bit_xor:
- top ^= stack[--sp];
- break;
-
- case gdb_agent_op_bit_not:
- top = ~top;
- break;
-
- case gdb_agent_op_equal:
- top = (stack[--sp] == top);
- break;
-
- case gdb_agent_op_less_signed:
- top = (((LONGEST) stack[--sp]) < ((LONGEST) top));
- break;
-
- case gdb_agent_op_less_unsigned:
- top = (stack[--sp] < top);
- break;
-
- case gdb_agent_op_ext:
- arg = aexpr->bytes[pc++];
- if (arg < (sizeof (LONGEST) * 8))
- {
- LONGEST mask = 1 << (arg - 1);
- top &= ((LONGEST) 1 << arg) - 1;
- top = (top ^ mask) - mask;
- }
- break;
-
- case gdb_agent_op_ref8:
- agent_mem_read (tframe, cnv.u8.bytes, (CORE_ADDR) top, 1);
- top = cnv.u8.val;
- break;
-
- case gdb_agent_op_ref16:
- agent_mem_read (tframe, cnv.u16.bytes, (CORE_ADDR) top, 2);
- top = cnv.u16.val;
- break;
-
- case gdb_agent_op_ref32:
- agent_mem_read (tframe, cnv.u32.bytes, (CORE_ADDR) top, 4);
- top = cnv.u32.val;
- break;
-
- case gdb_agent_op_ref64:
- agent_mem_read (tframe, cnv.u64.bytes, (CORE_ADDR) top, 8);
- top = cnv.u64.val;
- break;
-
- case gdb_agent_op_if_goto:
- if (top)
- pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]);
- else
- pc += 2;
- if (--sp >= 0)
- top = stack[sp];
- break;
-
- case gdb_agent_op_goto:
- pc = (aexpr->bytes[pc] << 8) + (aexpr->bytes[pc + 1]);
- break;
-
- case gdb_agent_op_const8:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- top = aexpr->bytes[pc++];
- break;
-
- case gdb_agent_op_const16:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- top = aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- break;
-
- case gdb_agent_op_const32:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- top = aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- break;
-
- case gdb_agent_op_const64:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- top = aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- top = (top << 8) + aexpr->bytes[pc++];
- break;
-
- case gdb_agent_op_reg:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- arg = aexpr->bytes[pc++];
- arg = (arg << 8) + aexpr->bytes[pc++];
- {
- int regnum = arg;
- struct regcache *regcache;
-
- regcache = get_context_regcache (ctx);
-
- switch (register_size (regnum))
- {
- case 8:
- collect_register (regcache, regnum, cnv.u64.bytes);
- top = cnv.u64.val;
- break;
- case 4:
- collect_register (regcache, regnum, cnv.u32.bytes);
- top = cnv.u32.val;
- break;
- case 2:
- collect_register (regcache, regnum, cnv.u16.bytes);
- top = cnv.u16.val;
- break;
- case 1:
- collect_register (regcache, regnum, cnv.u8.bytes);
- top = cnv.u8.val;
- break;
- default:
- internal_error (__FILE__, __LINE__,
- "unhandled register size");
- }
- }
- break;
-
- case gdb_agent_op_end:
- trace_debug ("At end of expression, sp=%d, stack top cache=0x%s",
- sp, pulongest (top));
- if (rslt)
- {
- if (sp <= 0)
- {
- /* This should be an error */
- trace_debug ("Stack is empty, nothing to return");
- return expr_eval_empty_stack;
- }
- *rslt = top;
- }
- return expr_eval_no_error;
-
- case gdb_agent_op_dup:
- stack[sp++] = top;
- break;
-
- case gdb_agent_op_pop:
- if (--sp >= 0)
- top = stack[sp];
- break;
-
- case gdb_agent_op_zero_ext:
- arg = aexpr->bytes[pc++];
- if (arg < (sizeof (LONGEST) * 8))
- top &= ((LONGEST) 1 << arg) - 1;
- break;
-
- case gdb_agent_op_swap:
- /* Interchange top two stack elements, making sure top gets
- copied back onto stack. */
- stack[sp] = top;
- top = stack[sp - 1];
- stack[sp - 1] = stack[sp];
- break;
-
- case gdb_agent_op_getv:
- /* Flush the cached stack top. */
- stack[sp++] = top;
- arg = aexpr->bytes[pc++];
- arg = (arg << 8) + aexpr->bytes[pc++];
- top = get_trace_state_variable_value (arg);
- break;
-
- case gdb_agent_op_setv:
- arg = aexpr->bytes[pc++];
- arg = (arg << 8) + aexpr->bytes[pc++];
- set_trace_state_variable_value (arg, top);
- /* Note that we leave the value on the stack, for the
- benefit of later/enclosing expressions. */
- break;
-
- case gdb_agent_op_tracev:
- arg = aexpr->bytes[pc++];
- arg = (arg << 8) + aexpr->bytes[pc++];
- agent_tsv_read (tframe, arg);
- break;
-
- /* GDB never (currently) generates any of these ops. */
- case gdb_agent_op_float:
- case gdb_agent_op_ref_float:
- case gdb_agent_op_ref_double:
- case gdb_agent_op_ref_long_double:
- case gdb_agent_op_l_to_d:
- case gdb_agent_op_d_to_l:
- case gdb_agent_op_trace16:
- trace_debug ("Agent expression op 0x%x valid, but not handled",
- op);
- /* If ever GDB generates any of these, we don't have the
- option of ignoring. */
- return 1;
-
- default:
- trace_debug ("Agent expression op 0x%x not recognized", op);
- /* Don't struggle on, things will just get worse. */
- return expr_eval_unrecognized_opcode;
- }
-
- /* Check for stack badness. */
- if (sp >= (STACK_MAX - 1))
- {
- trace_debug ("Expression stack overflow");
- return expr_eval_stack_overflow;
- }
-
- if (sp < 0)
- {
- trace_debug ("Expression stack underflow");
- return expr_eval_stack_underflow;
- }
+ size_t sp;
- trace_debug ("Op %s -> sp=%d, top=0x%s",
- gdb_agent_op_names[op], sp, pulongest (top));
+ blocklen = (remaining > 65535 ? 65535 : remaining);
+ sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen;
+ mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp);
+ if (mspace == NULL)
+ return 1;
+ /* Identify block as a memory block. */
+ *mspace = 'M';
+ ++mspace;
+ /* Record address and size. */
+ memcpy (mspace, &from, sizeof (from));
+ mspace += sizeof (from);
+ memcpy (mspace, &blocklen, sizeof (blocklen));
+ mspace += sizeof (blocklen);
+ /* Record the memory block proper. */
+ read_inferior_memory (from, mspace, blocklen);
+ trace_debug ("%d bytes recorded", blocklen);
+ remaining -= blocklen;
+ from += blocklen;
}
+ return 0;
}
-/* Do memory copies for bytecodes. */
-/* Do the recording of memory blocks for actions and bytecodes. */
-
-static int
-agent_mem_read (struct traceframe *tframe,
- unsigned char *to, CORE_ADDR from, ULONGEST len)
+int
+agent_mem_read_string (struct eval_agent_expr_context *ctx,
+ unsigned char *to, CORE_ADDR from, ULONGEST len)
{
- unsigned char *mspace;
+ unsigned char *buf, *mspace;
ULONGEST remaining = len;
- unsigned short blocklen;
-
- /* If a 'to' buffer is specified, use it. */
- if (to != NULL)
- {
- read_inferior_memory (from, to, len);
- return 0;
- }
+ unsigned short blocklen, i;
- /* Otherwise, create a new memory block in the trace buffer. */
+ /* To save a bit of space, block lengths are 16-bit, so break large
+ requests into multiple blocks. Bordering on overkill for strings,
+ but it could happen that someone specifies a large max length. */
while (remaining > 0)
{
size_t sp;
blocklen = (remaining > 65535 ? 65535 : remaining);
+ /* We want working space to accumulate nonzero bytes, since
+ traceframes must have a predecided size (otherwise it gets
+ harder to wrap correctly for the circular case, etc). */
+ buf = (unsigned char *) xmalloc (blocklen + 1);
+ for (i = 0; i < blocklen; ++i)
+ {
+ /* Read the string one byte at a time, in case the string is
+ at the end of a valid memory area - we don't want a
+ correctly-terminated string to engender segvio
+ complaints. */
+ read_inferior_memory (from + i, buf + i, 1);
+
+ if (buf[i] == '\0')
+ {
+ blocklen = i + 1;
+ /* Make sure outer loop stops now too. */
+ remaining = blocklen;
+ break;
+ }
+ }
sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen;
- mspace = add_traceframe_block (tframe, sp);
+ mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp);
if (mspace == NULL)
- return 1;
+ {
+ xfree (buf);
+ return 1;
+ }
/* Identify block as a memory block. */
*mspace = 'M';
++mspace;
/* Record address and size. */
- memcpy (mspace, &from, sizeof (from));
+ memcpy ((void *) mspace, (void *) &from, sizeof (from));
mspace += sizeof (from);
- memcpy (mspace, &blocklen, sizeof (blocklen));
+ memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen));
mspace += sizeof (blocklen);
- /* Record the memory block proper. */
- read_inferior_memory (from, mspace, blocklen);
- trace_debug ("%d bytes recorded", blocklen);
+ /* Copy the string contents. */
+ memcpy ((void *) mspace, (void *) buf, blocklen);
remaining -= blocklen;
from += blocklen;
+ xfree (buf);
}
return 0;
}
/* Record the value of a trace state variable. */
-static int
-agent_tsv_read (struct traceframe *tframe, int n)
+int
+agent_tsv_read (struct eval_agent_expr_context *ctx, int n)
{
unsigned char *vspace;
LONGEST val;
- vspace = add_traceframe_block (tframe,
+ vspace = add_traceframe_block (ctx->tframe, ctx->tpoint,
1 + sizeof (n) + sizeof (LONGEST));
if (vspace == NULL)
return 1;
return 0;
}
+#ifndef IN_PROCESS_AGENT
+
+/* Callback for traceframe_walk_blocks, used to find a given block
+ type in a traceframe. */
+
+static int
+match_blocktype (char blocktype, unsigned char *dataptr, void *data)
+{
+ char *wantedp = data;
+
+ if (*wantedp == blocktype)
+ return 1;
+
+ return 0;
+}
+
+/* Walk over all traceframe blocks of the traceframe buffer starting
+ at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
+ block found, passing in DATA unmodified. If CALLBACK returns true,
+ this returns a pointer to where the block is found. Returns NULL
+ if no callback call returned true, indicating that all blocks have
+ been walked. */
+
static unsigned char *
-traceframe_find_block_type (unsigned char *database, unsigned int datasize,
- int tfnum, char type_wanted)
+traceframe_walk_blocks (unsigned char *database, unsigned int datasize,
+ int tfnum,
+ int (*callback) (char blocktype,
+ unsigned char *dataptr,
+ void *data),
+ void *data)
{
unsigned char *dataptr;
datasize = dataptr - database;
dataptr = database = trace_buffer_lo;
}
+
blocktype = *dataptr++;
- if (type_wanted == blocktype)
+ if ((*callback) (blocktype, dataptr, data))
return dataptr;
switch (blocktype)
{
case 'R':
/* Skip over the registers block. */
- dataptr += register_cache_size ();
+ dataptr += current_target_desc ()->registers_size;
break;
case 'M':
/* Skip over the memory block. */
memcpy (&mlen, dataptr, sizeof (mlen));
dataptr += (sizeof (mlen) + mlen);
break;
+ case 'V':
+ /* Skip over the TSV block. */
+ dataptr += (sizeof (int) + sizeof (LONGEST));
+ break;
case 'S':
/* Skip over the static trace data block. */
memcpy (&mlen, dataptr, sizeof (mlen));
dataptr += (sizeof (mlen) + mlen);
break;
- case 'V':
- /* Skip over the TSV block. */
- dataptr += (sizeof (int) + sizeof (LONGEST));
- break;
default:
trace_debug ("traceframe %d has unknown block type 0x%x",
tfnum, blocktype);
return NULL;
}
+/* Look for the block of type TYPE_WANTED in the trameframe starting
+ at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
+ number. */
+
+static unsigned char *
+traceframe_find_block_type (unsigned char *database, unsigned int datasize,
+ int tfnum, char type_wanted)
+{
+ return traceframe_walk_blocks (database, datasize, tfnum,
+ match_blocktype, &type_wanted);
+}
+
static unsigned char *
traceframe_find_regblock (struct traceframe *tframe, int tfnum)
{
dataptr = traceframe_find_regblock (tframe, tfnum);
if (dataptr == NULL)
{
- /* We don't like making up numbers, but GDB has all manner of
- troubles when the target says there are no registers. */
+ /* Mark registers unavailable. */
supply_regblock (regcache, NULL);
/* We can generally guess at a PC, although this will be
{
struct regcache regcache;
unsigned char *dataptr;
+ const struct target_desc *tdesc = current_target_desc ();
dataptr = traceframe_find_regblock (tframe, -1);
if (dataptr == NULL)
return 0;
- init_register_cache (®cache, dataptr);
+ init_register_cache (®cache, tdesc, dataptr);
return regcache_read_pc (®cache);
}
/* Iterate through a traceframe's blocks, looking for memory. */
while ((dataptr = traceframe_find_block_type (dataptr,
- datasize - (dataptr - database),
+ datasize
+ - (dataptr - database),
tfnum, 'M')) != NULL)
{
memcpy (&maddr, dataptr, sizeof (maddr));
trace_debug ("traceframe %d has %d bytes at %s",
tfnum, mlen, paddress (maddr));
- /* Check that requested data is in bounds. */
- if (maddr <= addr && (addr + length) <= (maddr + mlen))
+ /* If the block includes the first part of the desired range,
+ return as much it has; GDB will re-request the remainder,
+ which might be in a different block of this trace frame. */
+ if (maddr <= addr && addr < (maddr + mlen))
{
- /* Block includes the requested range, copy it out. */
- memcpy (buf, dataptr + (addr - maddr), length);
- *nbytes = length;
+ ULONGEST amt = (maddr + mlen) - addr;
+ if (amt > length)
+ amt = length;
+
+ memcpy (buf, dataptr + (addr - maddr), amt);
+ *nbytes = amt;
return 0;
}
unsigned char *database, *dataptr;
unsigned int datasize;
int vnum;
+ int found = 0;
trace_debug ("traceframe_read_tsv");
datasize = tframe->data_size;
database = dataptr = &tframe->data[0];
- /* Iterate through a traceframe's blocks, looking for the tsv. */
+ /* Iterate through a traceframe's blocks, looking for the last
+ matched tsv. */
while ((dataptr = traceframe_find_block_type (dataptr,
- datasize - (dataptr - database),
+ datasize
+ - (dataptr - database),
tfnum, 'V')) != NULL)
{
memcpy (&vnum, dataptr, sizeof (vnum));
if (tsvnum == vnum)
{
memcpy (val, dataptr, sizeof (*val));
- return 0;
+ found = 1;
}
/* Skip over this block. */
dataptr += sizeof (LONGEST);
}
- trace_debug ("traceframe %d has no data for variable %d",
- tfnum, tsvnum);
- return 1;
+ if (!found)
+ trace_debug ("traceframe %d has no data for variable %d",
+ tfnum, tsvnum);
+ return !found;
}
-static LONGEST
-tsv_get_timestamp (void)
+/* Read a requested block of static tracepoint data from a trace
+ frame. */
+
+int
+traceframe_read_sdata (int tfnum, ULONGEST offset,
+ unsigned char *buf, ULONGEST length,
+ ULONGEST *nbytes)
{
- struct timeval tv;
+ struct traceframe *tframe;
+ unsigned char *database, *dataptr;
+ unsigned int datasize;
+ unsigned short mlen;
- if (gettimeofday (&tv, 0) != 0)
- return -1;
- else
- return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec;
-}
+ trace_debug ("traceframe_read_sdata");
-void
-initialize_tracepoint (void)
-{
- /* There currently no way to change the buffer size. */
- const int sizeOfBuffer = 5 * 1024 * 1024;
- unsigned char *buf = xmalloc (sizeOfBuffer);
- init_trace_buffer (buf, sizeOfBuffer);
+ tframe = find_traceframe (tfnum);
- /* Wire trace state variable 1 to be the timestamp. This will be
- uploaded to GDB upon connection and become one of its trace state
- variables. (In case you're wondering, if GDB already has a trace
- variable numbered 1, it will be renumbered.) */
- create_trace_state_variable (1);
- set_trace_state_variable_name (1, "trace_timestamp");
- set_trace_state_variable_getter (1, tsv_get_timestamp);
+ if (!tframe)
+ {
+ trace_debug ("traceframe %d not found", tfnum);
+ return 1;
+ }
+
+ datasize = tframe->data_size;
+ database = &tframe->data[0];
+
+ /* Iterate through a traceframe's blocks, looking for static
+ tracepoint data. */
+ dataptr = traceframe_find_block_type (database, datasize,
+ tfnum, 'S');
+ if (dataptr != NULL)
+ {
+ memcpy (&mlen, dataptr, sizeof (mlen));
+ dataptr += sizeof (mlen);
+ if (offset < mlen)
+ {
+ if (offset + length > mlen)
+ length = mlen - offset;
+
+ memcpy (buf, dataptr, length);
+ *nbytes = length;
+ }
+ else
+ *nbytes = 0;
+ return 0;
+ }
+
+ trace_debug ("traceframe %d has no static trace data", tfnum);
+
+ *nbytes = 0;
+ return 0;
+}
+
+/* Callback for traceframe_walk_blocks. Builds a traceframe-info
+ object. DATA is pointer to a struct buffer holding the
+ traceframe-info object being built. */
+
+static int
+build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data)
+{
+ struct buffer *buffer = data;
+
+ switch (blocktype)
+ {
+ case 'M':
+ {
+ unsigned short mlen;
+ CORE_ADDR maddr;
+
+ memcpy (&maddr, dataptr, sizeof (maddr));
+ dataptr += sizeof (maddr);
+ memcpy (&mlen, dataptr, sizeof (mlen));
+ dataptr += sizeof (mlen);
+ buffer_xml_printf (buffer,
+ "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
+ paddress (maddr), phex_nz (mlen, sizeof (mlen)));
+ break;
+ }
+ case 'V':
+ {
+ int vnum;
+
+ memcpy (&vnum, dataptr, sizeof (vnum));
+ buffer_xml_printf (buffer, "<tvar id=\"%d\"/>\n", vnum);
+ break;
+ }
+ case 'R':
+ case 'S':
+ {
+ break;
+ }
+ default:
+ warning ("Unhandled trace block type (%d) '%c ' "
+ "while building trace frame info.",
+ blocktype, blocktype);
+ break;
+ }
+
+ return 0;
+}
+
+/* Build a traceframe-info object for traceframe number TFNUM into
+ BUFFER. */
+
+int
+traceframe_read_info (int tfnum, struct buffer *buffer)
+{
+ struct traceframe *tframe;
+
+ trace_debug ("traceframe_read_info");
+
+ tframe = find_traceframe (tfnum);
+
+ if (!tframe)
+ {
+ trace_debug ("traceframe %d not found", tfnum);
+ return 1;
+ }
+
+ buffer_grow_str (buffer, "<traceframe-info>\n");
+ traceframe_walk_blocks (tframe->data, tframe->data_size,
+ tfnum, build_traceframe_info_xml, buffer);
+ buffer_grow_str0 (buffer, "</traceframe-info>\n");
+ return 0;
+}
+
+/* Return the first fast tracepoint whose jump pad contains PC. */
+
+static struct tracepoint *
+fast_tracepoint_from_jump_pad_address (CORE_ADDR pc)
+{
+ struct tracepoint *tpoint;
+
+ for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
+ if (tpoint->type == fast_tracepoint)
+ if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end)
+ return tpoint;
+
+ return NULL;
+}
+
+/* Return the first fast tracepoint whose trampoline contains PC. */
+
+static struct tracepoint *
+fast_tracepoint_from_trampoline_address (CORE_ADDR pc)
+{
+ struct tracepoint *tpoint;
+
+ for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
+ {
+ if (tpoint->type == fast_tracepoint
+ && tpoint->trampoline <= pc && pc < tpoint->trampoline_end)
+ return tpoint;
+ }
+
+ return NULL;
+}
+
+/* Return GDBserver's tracepoint that matches the IP Agent's
+ tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
+ address space. */
+
+static struct tracepoint *
+fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj)
+{
+ struct tracepoint *tpoint;
+
+ for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
+ if (tpoint->type == fast_tracepoint)
+ if (tpoint->obj_addr_on_target == ipa_tpoint_obj)
+ return tpoint;
+
+ return NULL;
+}
+
+#endif
+
+/* The type of the object that is used to synchronize fast tracepoint
+ collection. */
+
+typedef struct collecting_t
+{
+ /* The fast tracepoint number currently collecting. */
+ uintptr_t tpoint;
+
+ /* A number that GDBserver can use to identify the thread that is
+ presently holding the collect lock. This need not (and usually
+ is not) the thread id, as getting the current thread ID usually
+ requires a system call, which we want to avoid like the plague.
+ Usually this is thread's TCB, found in the TLS (pseudo-)
+ register, which is readable with a single insn on several
+ architectures. */
+ uintptr_t thread_area;
+} collecting_t;
+
+#ifndef IN_PROCESS_AGENT
+
+void
+force_unlock_trace_buffer (void)
+{
+ write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0);
+}
+
+/* Check if the thread identified by THREAD_AREA which is stopped at
+ STOP_PC, is presently locking the fast tracepoint collection, and
+ if so, gather some status of said collection. Returns 0 if the
+ thread isn't collecting or in the jump pad at all. 1, if in the
+ jump pad (or within gdb_collect) and hasn't executed the adjusted
+ original insn yet (can set a breakpoint there and run to it). 2,
+ if presently executing the adjusted original insn --- in which
+ case, if we want to move the thread out of the jump pad, we need to
+ single-step it until this function returns 0. */
+
+int
+fast_tracepoint_collecting (CORE_ADDR thread_area,
+ CORE_ADDR stop_pc,
+ struct fast_tpoint_collect_status *status)
+{
+ CORE_ADDR ipa_collecting;
+ CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end;
+ CORE_ADDR ipa_gdb_trampoline_buffer;
+ CORE_ADDR ipa_gdb_trampoline_buffer_end;
+ struct tracepoint *tpoint;
+ int needs_breakpoint;
+
+ /* The thread THREAD_AREA is either:
+
+ 0. not collecting at all, not within the jump pad, or within
+ gdb_collect or one of its callees.
+
+ 1. in the jump pad and haven't reached gdb_collect
+
+ 2. within gdb_collect (out of the jump pad) (collect is set)
+
+ 3. we're in the jump pad, after gdb_collect having returned,
+ possibly executing the adjusted insns.
+
+ For cases 1 and 3, `collecting' may or not be set. The jump pad
+ doesn't have any complicated jump logic, so we can tell if the
+ thread is executing the adjust original insn or not by just
+ matching STOP_PC with known jump pad addresses. If we it isn't
+ yet executing the original insn, set a breakpoint there, and let
+ the thread run to it, so to quickly step over a possible (many
+ insns) gdb_collect call. Otherwise, or when the breakpoint is
+ hit, only a few (small number of) insns are left to be executed
+ in the jump pad. Single-step the thread until it leaves the
+ jump pad. */
+
+ again:
+ tpoint = NULL;
+ needs_breakpoint = 0;
+ trace_debug ("fast_tracepoint_collecting");
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer,
+ &ipa_gdb_jump_pad_buffer))
+ fatal ("error extracting `gdb_jump_pad_buffer'");
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end,
+ &ipa_gdb_jump_pad_buffer_end))
+ fatal ("error extracting `gdb_jump_pad_buffer_end'");
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer,
+ &ipa_gdb_trampoline_buffer))
+ fatal ("error extracting `gdb_trampoline_buffer'");
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
+ &ipa_gdb_trampoline_buffer_end))
+ fatal ("error extracting `gdb_trampoline_buffer_end'");
+
+ if (ipa_gdb_jump_pad_buffer <= stop_pc
+ && stop_pc < ipa_gdb_jump_pad_buffer_end)
+ {
+ /* We can tell which tracepoint(s) the thread is collecting by
+ matching the jump pad address back to the tracepoint. */
+ tpoint = fast_tracepoint_from_jump_pad_address (stop_pc);
+ if (tpoint == NULL)
+ {
+ warning ("in jump pad, but no matching tpoint?");
+ return 0;
+ }
+ else
+ {
+ trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
+ "adj_insn(%s, %s)",
+ tpoint->number, paddress (tpoint->address),
+ paddress (tpoint->jump_pad),
+ paddress (tpoint->jump_pad_end),
+ paddress (tpoint->adjusted_insn_addr),
+ paddress (tpoint->adjusted_insn_addr_end));
+ }
+
+ /* Definitely in the jump pad. May or may not need
+ fast-exit-jump-pad breakpoint. */
+ if (tpoint->jump_pad <= stop_pc
+ && stop_pc < tpoint->adjusted_insn_addr)
+ needs_breakpoint = 1;
+ }
+ else if (ipa_gdb_trampoline_buffer <= stop_pc
+ && stop_pc < ipa_gdb_trampoline_buffer_end)
+ {
+ /* We can tell which tracepoint(s) the thread is collecting by
+ matching the trampoline address back to the tracepoint. */
+ tpoint = fast_tracepoint_from_trampoline_address (stop_pc);
+ if (tpoint == NULL)
+ {
+ warning ("in trampoline, but no matching tpoint?");
+ return 0;
+ }
+ else
+ {
+ trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
+ tpoint->number, paddress (tpoint->address),
+ paddress (tpoint->trampoline),
+ paddress (tpoint->trampoline_end));
+ }
+
+ /* Have not reached jump pad yet, but treat the trampoline as a
+ part of the jump pad that is before the adjusted original
+ instruction. */
+ needs_breakpoint = 1;
+ }
+ else
+ {
+ collecting_t ipa_collecting_obj;
+
+ /* If `collecting' is set/locked, then the THREAD_AREA thread
+ may or not be the one holding the lock. We have to read the
+ lock to find out. */
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting,
+ &ipa_collecting))
+ {
+ trace_debug ("fast_tracepoint_collecting:"
+ " failed reading 'collecting' in the inferior");
+ return 0;
+ }
+
+ if (!ipa_collecting)
+ {
+ trace_debug ("fast_tracepoint_collecting: not collecting"
+ " (and nobody is).");
+ return 0;
+ }
+
+ /* Some thread is collecting. Check which. */
+ if (read_inferior_memory (ipa_collecting,
+ (unsigned char *) &ipa_collecting_obj,
+ sizeof (ipa_collecting_obj)) != 0)
+ goto again;
+
+ if (ipa_collecting_obj.thread_area != thread_area)
+ {
+ trace_debug ("fast_tracepoint_collecting: not collecting "
+ "(another thread is)");
+ return 0;
+ }
+
+ tpoint
+ = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint);
+ if (tpoint == NULL)
+ {
+ warning ("fast_tracepoint_collecting: collecting, "
+ "but tpoint %s not found?",
+ paddress ((CORE_ADDR) ipa_collecting_obj.tpoint));
+ return 0;
+ }
+
+ /* The thread is within `gdb_collect', skip over the rest of
+ fast tracepoint collection quickly using a breakpoint. */
+ needs_breakpoint = 1;
+ }
+
+ /* The caller wants a bit of status detail. */
+ if (status != NULL)
+ {
+ status->tpoint_num = tpoint->number;
+ status->tpoint_addr = tpoint->address;
+ status->adjusted_insn_addr = tpoint->adjusted_insn_addr;
+ status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end;
+ }
+
+ if (needs_breakpoint)
+ {
+ /* Hasn't executed the original instruction yet. Set breakpoint
+ there, and wait till it's hit, then single-step until exiting
+ the jump pad. */
+
+ trace_debug ("\
+fast_tracepoint_collecting, returning continue-until-break at %s",
+ paddress (tpoint->adjusted_insn_addr));
+
+ return 1; /* continue */
+ }
+ else
+ {
+ /* Just single-step until exiting the jump pad. */
+
+ trace_debug ("fast_tracepoint_collecting, returning "
+ "need-single-step (%s-%s)",
+ paddress (tpoint->adjusted_insn_addr),
+ paddress (tpoint->adjusted_insn_addr_end));
+
+ return 2; /* single-step */
+ }
+}
+
+#endif
+
+#ifdef IN_PROCESS_AGENT
+
+/* The global fast tracepoint collect lock. Points to a collecting_t
+ object built on the stack by the jump pad, if presently locked;
+ NULL if it isn't locked. Note that this lock *must* be set while
+ executing any *function other than the jump pad. See
+ fast_tracepoint_collecting. */
+static collecting_t * ATTR_USED collecting;
+
+/* This routine, called from the jump pad (in asm) is designed to be
+ called from the jump pads of fast tracepoints, thus it is on the
+ critical path. */
+
+IP_AGENT_EXPORT void ATTR_USED
+gdb_collect (struct tracepoint *tpoint, unsigned char *regs)
+{
+ struct fast_tracepoint_ctx ctx;
+
+ /* Don't do anything until the trace run is completely set up. */
+ if (!tracing)
+ return;
+
+ ctx.base.type = fast_tracepoint;
+ ctx.regs = regs;
+ ctx.regcache_initted = 0;
+ /* Wrap the regblock in a register cache (in the stack, we don't
+ want to malloc here). */
+ ctx.regspace = alloca (ipa_tdesc->registers_size);
+ if (ctx.regspace == NULL)
+ {
+ trace_debug ("Trace buffer block allocation failed, skipping");
+ return;
+ }
+
+ for (ctx.tpoint = tpoint;
+ ctx.tpoint != NULL && ctx.tpoint->address == tpoint->address;
+ ctx.tpoint = ctx.tpoint->next)
+ {
+ if (!ctx.tpoint->enabled)
+ continue;
+
+ /* Multiple tracepoints of different types, such as fast tracepoint and
+ static tracepoint, can be set at the same address. */
+ if (ctx.tpoint->type != tpoint->type)
+ continue;
+
+ /* Test the condition if present, and collect if true. */
+ if (ctx.tpoint->cond == NULL
+ || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ ctx.tpoint))
+ {
+ collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ ctx.tpoint->address, ctx.tpoint);
+
+ /* Note that this will cause original insns to be written back
+ to where we jumped from, but that's OK because we're jumping
+ back to the next whole instruction. This will go badly if
+ instruction restoration is not atomic though. */
+ if (stopping_tracepoint
+ || trace_buffer_is_full
+ || expr_eval_result != expr_eval_no_error)
+ {
+ stop_tracing ();
+ break;
+ }
+ }
+ else
+ {
+ /* If there was a condition and it evaluated to false, the only
+ way we would stop tracing is if there was an error during
+ condition expression evaluation. */
+ if (expr_eval_result != expr_eval_no_error)
+ {
+ stop_tracing ();
+ break;
+ }
+ }
+ }
+}
+
+#endif
+
+#ifndef IN_PROCESS_AGENT
+
+CORE_ADDR
+get_raw_reg_func_addr (void)
+{
+ return ipa_sym_addrs.addr_get_raw_reg;
+}
+
+CORE_ADDR
+get_get_tsv_func_addr (void)
+{
+ return ipa_sym_addrs.addr_get_trace_state_variable_value;
+}
+
+CORE_ADDR
+get_set_tsv_func_addr (void)
+{
+ return ipa_sym_addrs.addr_set_trace_state_variable_value;
+}
+
+static void
+compile_tracepoint_condition (struct tracepoint *tpoint,
+ CORE_ADDR *jump_entry)
+{
+ CORE_ADDR entry_point = *jump_entry;
+ enum eval_result_type err;
+
+ trace_debug ("Starting condition compilation for tracepoint %d\n",
+ tpoint->number);
+
+ /* Initialize the global pointer to the code being built. */
+ current_insn_ptr = *jump_entry;
+
+ emit_prologue ();
+
+ err = compile_bytecodes (tpoint->cond);
+
+ if (err == expr_eval_no_error)
+ {
+ emit_epilogue ();
+
+ /* Record the beginning of the compiled code. */
+ tpoint->compiled_cond = entry_point;
+
+ trace_debug ("Condition compilation for tracepoint %d complete\n",
+ tpoint->number);
+ }
+ else
+ {
+ /* Leave the unfinished code in situ, but don't point to it. */
+
+ tpoint->compiled_cond = 0;
+
+ trace_debug ("Condition compilation for tracepoint %d failed, "
+ "error code %d",
+ tpoint->number, err);
+ }
+
+ /* Update the code pointer passed in. Note that we do this even if
+ the compile fails, so that we can look at the partial results
+ instead of letting them be overwritten. */
+ *jump_entry = current_insn_ptr;
+
+ /* Leave a gap, to aid dump decipherment. */
+ *jump_entry += 16;
+}
+
+/* We'll need to adjust these when we consider bi-arch setups, and big
+ endian machines. */
+
+static int
+write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr)
+{
+ return write_inferior_memory (where,
+ (unsigned char *) &ptr, sizeof (void *));
+}
+
+/* The base pointer of the IPA's heap. This is the only memory the
+ IPA is allowed to use. The IPA should _not_ call the inferior's
+ `malloc' during operation. That'd be slow, and, most importantly,
+ it may not be safe. We may be collecting a tracepoint in a signal
+ handler, for example. */
+static CORE_ADDR target_tp_heap;
+
+/* Allocate at least SIZE bytes of memory from the IPA heap, aligned
+ to 8 bytes. */
+
+static CORE_ADDR
+target_malloc (ULONGEST size)
+{
+ CORE_ADDR ptr;
+
+ if (target_tp_heap == 0)
+ {
+ /* We have the pointer *address*, need what it points to. */
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer,
+ &target_tp_heap))
+ fatal ("could get target heap head pointer");
+ }
+
+ ptr = target_tp_heap;
+ target_tp_heap += size;
+
+ /* Pad to 8-byte alignment. */
+ target_tp_heap = ((target_tp_heap + 7) & ~0x7);
+
+ return ptr;
+}
+
+static CORE_ADDR
+download_agent_expr (struct agent_expr *expr)
+{
+ CORE_ADDR expr_addr;
+ CORE_ADDR expr_bytes;
+
+ expr_addr = target_malloc (sizeof (*expr));
+ write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr));
+
+ expr_bytes = target_malloc (expr->length);
+ write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes),
+ expr_bytes);
+ write_inferior_memory (expr_bytes, expr->bytes, expr->length);
+
+ return expr_addr;
+}
+
+/* Align V up to N bits. */
+#define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
+
+/* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
+
+static void
+download_tracepoint_1 (struct tracepoint *tpoint)
+{
+ struct tracepoint target_tracepoint;
+ CORE_ADDR tpptr = 0;
+
+ gdb_assert (tpoint->type == fast_tracepoint
+ || tpoint->type == static_tracepoint);
+
+ if (tpoint->cond != NULL && target_emit_ops () != NULL)
+ {
+ CORE_ADDR jentry, jump_entry;
+
+ jentry = jump_entry = get_jump_space_head ();
+
+ if (tpoint->cond != NULL)
+ {
+ /* Pad to 8-byte alignment. (needed?) */
+ /* Actually this should be left for the target to
+ decide. */
+ jentry = UALIGN (jentry, 8);
+
+ compile_tracepoint_condition (tpoint, &jentry);
+ }
+
+ /* Pad to 8-byte alignment. */
+ jentry = UALIGN (jentry, 8);
+ claim_jump_space (jentry - jump_entry);
+ }
+
+ target_tracepoint = *tpoint;
+
+ tpptr = target_malloc (sizeof (*tpoint));
+ tpoint->obj_addr_on_target = tpptr;
+
+ /* Write the whole object. We'll fix up its pointers in a bit.
+ Assume no next for now. This is fixed up above on the next
+ iteration, if there's any. */
+ target_tracepoint.next = NULL;
+ /* Need to clear this here too, since we're downloading the
+ tracepoints before clearing our own copy. */
+ target_tracepoint.hit_count = 0;
+
+ write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint,
+ sizeof (target_tracepoint));
+
+ if (tpoint->cond)
+ write_inferior_data_ptr (tpptr + offsetof (struct tracepoint,
+ cond),
+ download_agent_expr (tpoint->cond));
+
+ if (tpoint->numactions)
+ {
+ int i;
+ CORE_ADDR actions_array;
+
+ /* The pointers array. */
+ actions_array
+ = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions);
+ write_inferior_data_ptr (tpptr + offsetof (struct tracepoint,
+ actions),
+ actions_array);
+
+ /* Now for each pointer, download the action. */
+ for (i = 0; i < tpoint->numactions; i++)
+ {
+ struct tracepoint_action *action = tpoint->actions[i];
+ CORE_ADDR ipa_action = action->ops->download (action);
+
+ if (ipa_action != 0)
+ write_inferior_data_ptr
+ (actions_array + i * sizeof (*tpoint->actions),
+ ipa_action);
+ }
+ }
+}
+
+#define IPA_PROTO_FAST_TRACE_FLAG 0
+#define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
+#define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
+#define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
+#define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
+
+/* Send a command to agent to download and install tracepoint TPOINT. */
+
+static int
+tracepoint_send_agent (struct tracepoint *tpoint)
+{
+ char buf[IPA_CMD_BUF_SIZE];
+ char *p;
+ int i, ret;
+
+ p = buf;
+ strcpy (p, "FastTrace:");
+ p += 10;
+
+ COPY_FIELD_TO_BUF (p, tpoint, number);
+ COPY_FIELD_TO_BUF (p, tpoint, address);
+ COPY_FIELD_TO_BUF (p, tpoint, type);
+ COPY_FIELD_TO_BUF (p, tpoint, enabled);
+ COPY_FIELD_TO_BUF (p, tpoint, step_count);
+ COPY_FIELD_TO_BUF (p, tpoint, pass_count);
+ COPY_FIELD_TO_BUF (p, tpoint, numactions);
+ COPY_FIELD_TO_BUF (p, tpoint, hit_count);
+ COPY_FIELD_TO_BUF (p, tpoint, traceframe_usage);
+ COPY_FIELD_TO_BUF (p, tpoint, compiled_cond);
+ COPY_FIELD_TO_BUF (p, tpoint, orig_size);
+
+ /* condition */
+ p = agent_expr_send (p, tpoint->cond);
+
+ /* tracepoint_action */
+ for (i = 0; i < tpoint->numactions; i++)
+ {
+ struct tracepoint_action *action = tpoint->actions[i];
+
+ p[0] = action->type;
+ p = action->ops->send (&p[1], action);
+ }
+
+ get_jump_space_head ();
+ /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
+ agent can use jump pad from it. */
+ if (tpoint->type == fast_tracepoint)
+ {
+ memcpy (p, &gdb_jump_pad_head, 8);
+ p += 8;
+ }
+
+ ret = run_inferior_command (buf, (int) (ptrdiff_t) (p - buf));
+ if (ret)
+ return ret;
+
+ if (strncmp (buf, "OK", 2) != 0)
+ return 1;
+
+ /* The value of tracepoint's target address is stored in BUF. */
+ memcpy (&tpoint->obj_addr_on_target,
+ &buf[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET], 8);
+
+ if (tpoint->type == fast_tracepoint)
+ {
+ unsigned char *insn
+ = (unsigned char *) &buf[IPA_PROTO_FAST_TRACE_FJUMP_INSN];
+ int fjump_size;
+
+ trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
+ (unsigned int) tpoint->obj_addr_on_target,
+ (unsigned int) gdb_jump_pad_head);
+
+ memcpy (&gdb_jump_pad_head, &buf[IPA_PROTO_FAST_TRACE_JUMP_PAD], 8);
+
+ /* This has been done in agent. We should also set up record for it. */
+ memcpy (&fjump_size, &buf[IPA_PROTO_FAST_TRACE_FJUMP_SIZE], 4);
+ /* Wire it in. */
+ tpoint->handle
+ = set_fast_tracepoint_jump (tpoint->address, insn, fjump_size);
+ }
+
+ return 0;
+}
+
+static void
+download_tracepoint (struct tracepoint *tpoint)
+{
+ struct tracepoint *tp, *tp_prev;
+
+ if (tpoint->type != fast_tracepoint
+ && tpoint->type != static_tracepoint)
+ return;
+
+ download_tracepoint_1 (tpoint);
+
+ /* Find the previous entry of TPOINT, which is fast tracepoint or
+ static tracepoint. */
+ tp_prev = NULL;
+ for (tp = tracepoints; tp != tpoint; tp = tp->next)
+ {
+ if (tp->type == fast_tracepoint || tp->type == static_tracepoint)
+ tp_prev = tp;
+ }
+
+ if (tp_prev)
+ {
+ CORE_ADDR tp_prev_target_next_addr;
+
+ /* Insert TPOINT after TP_PREV in IPA. */
+ if (read_inferior_data_pointer (tp_prev->obj_addr_on_target
+ + offsetof (struct tracepoint, next),
+ &tp_prev_target_next_addr))
+ fatal ("error reading `tp_prev->next'");
+
+ /* tpoint->next = tp_prev->next */
+ write_inferior_data_ptr (tpoint->obj_addr_on_target
+ + offsetof (struct tracepoint, next),
+ tp_prev_target_next_addr);
+ /* tp_prev->next = tpoint */
+ write_inferior_data_ptr (tp_prev->obj_addr_on_target
+ + offsetof (struct tracepoint, next),
+ tpoint->obj_addr_on_target);
+ }
+ else
+ /* First object in list, set the head pointer in the
+ inferior. */
+ write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints,
+ tpoint->obj_addr_on_target);
+
+}
+
+static void
+download_trace_state_variables (void)
+{
+ CORE_ADDR ptr = 0, prev_ptr = 0;
+ struct trace_state_variable *tsv;
+
+ /* Start out empty. */
+ write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0);
+
+ for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next)
+ {
+ struct trace_state_variable target_tsv;
+
+ /* TSV's with a getter have been initialized equally in both the
+ inferior and GDBserver. Skip them. */
+ if (tsv->getter != NULL)
+ continue;
+
+ target_tsv = *tsv;
+
+ prev_ptr = ptr;
+ ptr = target_malloc (sizeof (*tsv));
+
+ if (tsv == trace_state_variables)
+ {
+ /* First object in list, set the head pointer in the
+ inferior. */
+
+ write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables,
+ ptr);
+ }
+ else
+ {
+ write_inferior_data_ptr (prev_ptr
+ + offsetof (struct trace_state_variable,
+ next),
+ ptr);
+ }
+
+ /* Write the whole object. We'll fix up its pointers in a bit.
+ Assume no next, fixup when needed. */
+ target_tsv.next = NULL;
+
+ write_inferior_memory (ptr, (unsigned char *) &target_tsv,
+ sizeof (target_tsv));
+
+ if (tsv->name != NULL)
+ {
+ size_t size = strlen (tsv->name) + 1;
+ CORE_ADDR name_addr = target_malloc (size);
+ write_inferior_memory (name_addr,
+ (unsigned char *) tsv->name, size);
+ write_inferior_data_ptr (ptr
+ + offsetof (struct trace_state_variable,
+ name),
+ name_addr);
+ }
+
+ if (tsv->getter != NULL)
+ {
+ fatal ("what to do with these?");
+ }
+ }
+
+ if (prev_ptr != 0)
+ {
+ /* Fixup the next pointer in the last item in the list. */
+ write_inferior_data_ptr (prev_ptr
+ + offsetof (struct trace_state_variable,
+ next), 0);
+ }
+}
+
+/* Upload complete trace frames out of the IP Agent's trace buffer
+ into GDBserver's trace buffer. This always uploads either all or
+ no trace frames. This is the counter part of
+ `trace_alloc_trace_buffer'. See its description of the atomic
+ synching mechanism. */
+
+static void
+upload_fast_traceframes (void)
+{
+ unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count;
+ unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy;
+ CORE_ADDR tf;
+ struct ipa_trace_buffer_control ipa_trace_buffer_ctrl;
+ unsigned int curr_tbctrl_idx;
+ unsigned int ipa_trace_buffer_ctrl_curr;
+ unsigned int ipa_trace_buffer_ctrl_curr_old;
+ CORE_ADDR ipa_trace_buffer_ctrl_addr;
+ struct breakpoint *about_to_request_buffer_space_bkpt;
+ CORE_ADDR ipa_trace_buffer_lo;
+ CORE_ADDR ipa_trace_buffer_hi;
+
+ if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count,
+ &ipa_traceframe_read_count_racy))
+ {
+ /* This will happen in most targets if the current thread is
+ running. */
+ return;
+ }
+
+ if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count,
+ &ipa_traceframe_write_count_racy))
+ return;
+
+ trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
+ ipa_traceframe_write_count_racy
+ - ipa_traceframe_read_count_racy,
+ ipa_traceframe_write_count_racy,
+ ipa_traceframe_read_count_racy);
+
+ if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy)
+ return;
+
+ about_to_request_buffer_space_bkpt
+ = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space,
+ NULL);
+
+ if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr,
+ &ipa_trace_buffer_ctrl_curr))
+ return;
+
+ ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr;
+
+ curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK;
+
+ {
+ unsigned int prev, counter;
+
+ /* Update the token, with new counters, and the GDBserver stamp
+ bit. Alway reuse the current TBC index. */
+ prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR;
+ counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR;
+
+ ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
+ | (prev << 12)
+ | counter
+ | curr_tbctrl_idx);
+ }
+
+ if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr,
+ ipa_trace_buffer_ctrl_curr))
+ return;
+
+ trace_debug ("Lib: Committed %08x -> %08x",
+ ipa_trace_buffer_ctrl_curr_old,
+ ipa_trace_buffer_ctrl_curr);
+
+ /* Re-read these, now that we've installed the
+ `about_to_request_buffer_space' breakpoint/lock. A thread could
+ have finished a traceframe between the last read of these
+ counters and setting the breakpoint above. If we start
+ uploading, we never want to leave this function with
+ traceframe_read_count != 0, otherwise, GDBserver could end up
+ incrementing the counter tokens more than once (due to event loop
+ nesting), which would break the IP agent's "effective" detection
+ (see trace_alloc_trace_buffer). */
+ if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count,
+ &ipa_traceframe_read_count))
+ return;
+ if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count,
+ &ipa_traceframe_write_count))
+ return;
+
+ if (debug_threads)
+ {
+ trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
+ ipa_traceframe_write_count - ipa_traceframe_read_count,
+ ipa_traceframe_write_count, ipa_traceframe_read_count);
+
+ if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy
+ || ipa_traceframe_read_count != ipa_traceframe_read_count_racy)
+ trace_debug ("note that ipa_traceframe_count's parts changed");
+ }
+
+ /* Get the address of the current TBC object (the IP agent has an
+ array of 3 such objects). The index is stored in the TBC
+ token. */
+ ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl;
+ ipa_trace_buffer_ctrl_addr
+ += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx;
+
+ if (read_inferior_memory (ipa_trace_buffer_ctrl_addr,
+ (unsigned char *) &ipa_trace_buffer_ctrl,
+ sizeof (struct ipa_trace_buffer_control)))
+ return;
+
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo,
+ &ipa_trace_buffer_lo))
+ return;
+ if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi,
+ &ipa_trace_buffer_hi))
+ return;
+
+ /* Offsets are easier to grok for debugging than raw addresses,
+ especially for the small trace buffer sizes that are useful for
+ testing. */
+ trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
+ "endfree=%d wrap=%d hi=%d",
+ curr_tbctrl_idx,
+ (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo));
+
+ /* Note that the IPA's buffer is always circular. */
+
+#define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
+
+#define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
+ ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
+
+#define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
+ (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
+ - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
+ ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
+ : 0))
+
+ tf = IPA_FIRST_TRACEFRAME ();
+
+ while (ipa_traceframe_write_count - ipa_traceframe_read_count)
+ {
+ struct tracepoint *tpoint;
+ struct traceframe *tframe;
+ unsigned char *block;
+ struct traceframe ipa_tframe;
+
+ if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe,
+ offsetof (struct traceframe, data)))
+ error ("Uploading: couldn't read traceframe at %s\n", paddress (tf));
+
+ if (ipa_tframe.tpnum == 0)
+ fatal ("Uploading: No (more) fast traceframes, but "
+ "ipa_traceframe_count == %u??\n",
+ ipa_traceframe_write_count - ipa_traceframe_read_count);
+
+ /* Note that this will be incorrect for multi-location
+ tracepoints... */
+ tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum);
+
+ tframe = add_traceframe (tpoint);
+ if (tframe == NULL)
+ {
+ trace_buffer_is_full = 1;
+ trace_debug ("Uploading: trace buffer is full");
+ }
+ else
+ {
+ /* Copy the whole set of blocks in one go for now. FIXME:
+ split this in smaller blocks. */
+ block = add_traceframe_block (tframe, tpoint,
+ ipa_tframe.data_size);
+ if (block != NULL)
+ {
+ if (read_inferior_memory (tf
+ + offsetof (struct traceframe, data),
+ block, ipa_tframe.data_size))
+ error ("Uploading: Couldn't read traceframe data at %s\n",
+ paddress (tf + offsetof (struct traceframe, data)));
+ }
+
+ trace_debug ("Uploading: traceframe didn't fit");
+ finish_traceframe (tframe);
+ }
+
+ tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe);
+
+ /* If we freed the traceframe that wrapped around, go back
+ to the non-wrap case. */
+ if (tf < ipa_trace_buffer_ctrl.start)
+ {
+ trace_debug ("Lib: Discarding past the wraparound");
+ ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
+ }
+ ipa_trace_buffer_ctrl.start = tf;
+ ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start;
+ ++ipa_traceframe_read_count;
+
+ if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free
+ && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free)
+ {
+ trace_debug ("Lib: buffer is fully empty. "
+ "Trace buffer [%d] start=%d free=%d endfree=%d",
+ curr_tbctrl_idx,
+ (int) (ipa_trace_buffer_ctrl.start
+ - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.free
+ - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.end_free
+ - ipa_trace_buffer_lo));
+
+ ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo;
+ ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo;
+ ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi;
+ ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
+ }
+
+ trace_debug ("Uploaded a traceframe\n"
+ "Lib: Trace buffer [%d] start=%d free=%d "
+ "endfree=%d wrap=%d hi=%d",
+ curr_tbctrl_idx,
+ (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.end_free
+ - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo),
+ (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo));
+ }
+
+ if (write_inferior_memory (ipa_trace_buffer_ctrl_addr,
+ (unsigned char *) &ipa_trace_buffer_ctrl,
+ sizeof (struct ipa_trace_buffer_control)))
+ return;
+
+ write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count,
+ ipa_traceframe_read_count);
+
+ trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx);
+
+ pause_all (1);
+ cancel_breakpoints ();
+
+ delete_breakpoint (about_to_request_buffer_space_bkpt);
+ about_to_request_buffer_space_bkpt = NULL;
+
+ unpause_all (1);
+
+ if (trace_buffer_is_full)
+ stop_tracing ();
+}
+#endif
+
+#ifdef IN_PROCESS_AGENT
+
+IP_AGENT_EXPORT int ust_loaded;
+IP_AGENT_EXPORT char cmd_buf[IPA_CMD_BUF_SIZE];
+
+#ifdef HAVE_UST
+
+/* Static tracepoints. */
+
+/* UST puts a "struct tracepoint" in the global namespace, which
+ conflicts with our tracepoint. Arguably, being a library, it
+ shouldn't take ownership of such a generic name. We work around it
+ here. */
+#define tracepoint ust_tracepoint
+#include <ust/ust.h>
+#undef tracepoint
+
+extern int serialize_to_text (char *outbuf, int bufsize,
+ const char *fmt, va_list ap);
+
+#define GDB_PROBE_NAME "gdb"
+
+/* We dynamically search for the UST symbols instead of linking them
+ in. This lets the user decide if the application uses static
+ tracepoints, instead of always pulling libust.so in. This vector
+ holds pointers to all functions we care about. */
+
+static struct
+{
+ int (*serialize_to_text) (char *outbuf, int bufsize,
+ const char *fmt, va_list ap);
+
+ int (*ltt_probe_register) (struct ltt_available_probe *pdata);
+ int (*ltt_probe_unregister) (struct ltt_available_probe *pdata);
+
+ int (*ltt_marker_connect) (const char *channel, const char *mname,
+ const char *pname);
+ int (*ltt_marker_disconnect) (const char *channel, const char *mname,
+ const char *pname);
+
+ void (*marker_iter_start) (struct marker_iter *iter);
+ void (*marker_iter_next) (struct marker_iter *iter);
+ void (*marker_iter_stop) (struct marker_iter *iter);
+ void (*marker_iter_reset) (struct marker_iter *iter);
+} ust_ops;
+
+#include <dlfcn.h>
+
+/* Cast through typeof to catch incompatible API changes. Since UST
+ only builds with gcc, we can freely use gcc extensions here
+ too. */
+#define GET_UST_SYM(SYM) \
+ do \
+ { \
+ if (ust_ops.SYM == NULL) \
+ ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
+ if (ust_ops.SYM == NULL) \
+ return 0; \
+ } while (0)
+
+#define USTF(SYM) ust_ops.SYM
+
+/* Get pointers to all libust.so functions we care about. */
+
+static int
+dlsym_ust (void)
+{
+ GET_UST_SYM (serialize_to_text);
+
+ GET_UST_SYM (ltt_probe_register);
+ GET_UST_SYM (ltt_probe_unregister);
+ GET_UST_SYM (ltt_marker_connect);
+ GET_UST_SYM (ltt_marker_disconnect);
+
+ GET_UST_SYM (marker_iter_start);
+ GET_UST_SYM (marker_iter_next);
+ GET_UST_SYM (marker_iter_stop);
+ GET_UST_SYM (marker_iter_reset);
+
+ ust_loaded = 1;
+ return 1;
+}
+
+/* Given an UST marker, return the matching gdb static tracepoint.
+ The match is done by address. */
+
+static struct tracepoint *
+ust_marker_to_static_tracepoint (const struct marker *mdata)
+{
+ struct tracepoint *tpoint;
+
+ for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
+ {
+ if (tpoint->type != static_tracepoint)
+ continue;
+
+ if (tpoint->address == (uintptr_t) mdata->location)
+ return tpoint;
+ }
+
+ return NULL;
+}
+
+/* The probe function we install on lttng/ust markers. Whenever a
+ probed ust marker is hit, this function is called. This is similar
+ to gdb_collect, only for static tracepoints, instead of fast
+ tracepoints. */
+
+static void
+gdb_probe (const struct marker *mdata, void *probe_private,
+ struct registers *regs, void *call_private,
+ const char *fmt, va_list *args)
+{
+ struct tracepoint *tpoint;
+ struct static_tracepoint_ctx ctx;
+
+ /* Don't do anything until the trace run is completely set up. */
+ if (!tracing)
+ {
+ trace_debug ("gdb_probe: not tracing\n");
+ return;
+ }
+
+ ctx.base.type = static_tracepoint;
+ ctx.regcache_initted = 0;
+ ctx.regs = regs;
+ ctx.fmt = fmt;
+ ctx.args = args;
+
+ /* Wrap the regblock in a register cache (in the stack, we don't
+ want to malloc here). */
+ ctx.regspace = alloca (ipa_tdesc->registers_size);
+ if (ctx.regspace == NULL)
+ {
+ trace_debug ("Trace buffer block allocation failed, skipping");
+ return;
+ }
+
+ tpoint = ust_marker_to_static_tracepoint (mdata);
+ if (tpoint == NULL)
+ {
+ trace_debug ("gdb_probe: marker not known: "
+ "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
+ mdata->location, mdata->channel,
+ mdata->name, mdata->format);
+ return;
+ }
+
+ if (!tpoint->enabled)
+ {
+ trace_debug ("gdb_probe: tracepoint disabled");
+ return;
+ }
+
+ ctx.tpoint = tpoint;
+
+ trace_debug ("gdb_probe: collecting marker: "
+ "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
+ mdata->location, mdata->channel,
+ mdata->name, mdata->format);
+
+ /* Test the condition if present, and collect if true. */
+ if (tpoint->cond == NULL
+ || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ tpoint))
+ {
+ collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ tpoint->address, tpoint);
+
+ if (stopping_tracepoint
+ || trace_buffer_is_full
+ || expr_eval_result != expr_eval_no_error)
+ stop_tracing ();
+ }
+ else
+ {
+ /* If there was a condition and it evaluated to false, the only
+ way we would stop tracing is if there was an error during
+ condition expression evaluation. */
+ if (expr_eval_result != expr_eval_no_error)
+ stop_tracing ();
+ }
+}
+
+/* Called if the gdb static tracepoint requested collecting "$_sdata",
+ static tracepoint string data. This is a string passed to the
+ tracing library by the user, at the time of the tracepoint marker
+ call. E.g., in the UST marker call:
+
+ trace_mark (ust, bar33, "str %s", "FOOBAZ");
+
+ the collected data is "str FOOBAZ".
+*/
+
+static void
+collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
+ struct traceframe *tframe)
+{
+ struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx;
+ unsigned char *bufspace;
+ int size;
+ va_list copy;
+ unsigned short blocklen;
+
+ if (umd == NULL)
+ {
+ trace_debug ("Wanted to collect static trace data, "
+ "but there's no static trace data");
+ return;
+ }
+
+ va_copy (copy, *umd->args);
+ size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy);
+ va_end (copy);
+
+ trace_debug ("Want to collect ust data");
+
+ /* 'S' + size + string */
+ bufspace = add_traceframe_block (tframe, umd->tpoint,
+ 1 + sizeof (blocklen) + size + 1);
+ if (bufspace == NULL)
+ {
+ trace_debug ("Trace buffer block allocation failed, skipping");
+ return;
+ }
+
+ /* Identify a static trace data block. */
+ *bufspace = 'S';
+
+ blocklen = size + 1;
+ memcpy (bufspace + 1, &blocklen, sizeof (blocklen));
+
+ va_copy (copy, *umd->args);
+ USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen),
+ size + 1, umd->fmt, copy);
+ va_end (copy);
+
+ trace_debug ("Storing static tracepoint data in regblock: %s",
+ bufspace + 1 + sizeof (blocklen));
+}
+
+/* The probe to register with lttng/ust. */
+static struct ltt_available_probe gdb_ust_probe =
+ {
+ GDB_PROBE_NAME,
+ NULL,
+ gdb_probe,
+ };
+
+#endif /* HAVE_UST */
+#endif /* IN_PROCESS_AGENT */
+
+#ifndef IN_PROCESS_AGENT
+
+/* Ask the in-process agent to run a command. Since we don't want to
+ have to handle the IPA hitting breakpoints while running the
+ command, we pause all threads, remove all breakpoints, and then set
+ the helper thread re-running. We communicate with the helper
+ thread by means of direct memory xfering, and a socket for
+ synchronization. */
+
+static int
+run_inferior_command (char *cmd, int len)
+{
+ int err = -1;
+ int pid = ptid_get_pid (current_ptid);
+
+ trace_debug ("run_inferior_command: running: %s", cmd);
+
+ pause_all (0);
+ uninsert_all_breakpoints ();
+
+ err = agent_run_command (pid, (const char *) cmd, len);
+
+ reinsert_all_breakpoints ();
+ unpause_all (0);
+
+ return err;
+}
+
+#else /* !IN_PROCESS_AGENT */
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifndef UNIX_PATH_MAX
+#define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
+#endif
+
+/* Where we put the socked used for synchronization. */
+#define SOCK_DIR P_tmpdir
+
+/* Thread ID of the helper thread. GDBserver reads this to know which
+ is the help thread. This is an LWP id on Linux. */
+int helper_thread_id;
+
+static int
+init_named_socket (const char *name)
+{
+ int result, fd;
+ struct sockaddr_un addr;
+
+ result = fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (result == -1)
+ {
+ warning ("socket creation failed: %s", strerror (errno));
+ return -1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ strncpy (addr.sun_path, name, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
+
+ result = access (name, F_OK);
+ if (result == 0)
+ {
+ /* File exists. */
+ result = unlink (name);
+ if (result == -1)
+ {
+ warning ("unlink failed: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+ warning ("socket %s already exists; overwriting", name);
+ }
+
+ result = bind (fd, (struct sockaddr *) &addr, sizeof (addr));
+ if (result == -1)
+ {
+ warning ("bind failed: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+
+ result = listen (fd, 1);
+ if (result == -1)
+ {
+ warning ("listen: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+static char agent_socket_name[UNIX_PATH_MAX];
+
+static int
+gdb_agent_socket_init (void)
+{
+ int result, fd;
+
+ result = xsnprintf (agent_socket_name, UNIX_PATH_MAX, "%s/gdb_ust%d",
+ SOCK_DIR, getpid ());
+ if (result >= UNIX_PATH_MAX)
+ {
+ trace_debug ("string overflow allocating socket name");
+ return -1;
+ }
+
+ fd = init_named_socket (agent_socket_name);
+ if (fd < 0)
+ warning ("Error initializing named socket (%s) for communication with the "
+ "ust helper thread. Check that directory exists and that it "
+ "is writable.", agent_socket_name);
+
+ return fd;
+}
+
+#ifdef HAVE_UST
+
+/* The next marker to be returned on a qTsSTM command. */
+static const struct marker *next_st;
+
+/* Returns the first known marker. */
+
+struct marker *
+first_marker (void)
+{
+ struct marker_iter iter;
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+
+ return iter.marker;
+}
+
+/* Returns the marker following M. */
+
+const struct marker *
+next_marker (const struct marker *m)
+{
+ struct marker_iter iter;
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+
+ for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
+ {
+ if (iter.marker == m)
+ {
+ USTF(marker_iter_next) (&iter);
+ return iter.marker;
+ }
+ }
+
+ return NULL;
+}
+
+/* Return an hexstr version of the STR C string, fit for sending to
+ GDB. */
+
+static char *
+cstr_to_hexstr (const char *str)
+{
+ int len = strlen (str);
+ char *hexstr = xmalloc (len * 2 + 1);
+ bin2hex ((gdb_byte *) str, hexstr, len);
+ return hexstr;
+}
+
+/* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
+ packets. */
+
+static void
+response_ust_marker (char *packet, const struct marker *st)
+{
+ char *strid, *format, *tmp;
+
+ next_st = next_marker (st);
+
+ tmp = xmalloc (strlen (st->channel) + 1 +
+ strlen (st->name) + 1);
+ sprintf (tmp, "%s/%s", st->channel, st->name);
+
+ strid = cstr_to_hexstr (tmp);
+ free (tmp);
+
+ format = cstr_to_hexstr (st->format);
+
+ sprintf (packet, "m%s:%s:%s",
+ paddress ((uintptr_t) st->location),
+ strid,
+ format);
+
+ free (strid);
+ free (format);
+}
+
+/* Return the first static tracepoint, and initialize the state
+ machine that will iterate through all the static tracepoints. */
+
+static void
+cmd_qtfstm (char *packet)
+{
+ trace_debug ("Returning first trace state variable definition");
+
+ if (first_marker ())
+ response_ust_marker (packet, first_marker ());
+ else
+ strcpy (packet, "l");
+}
+
+/* Return additional trace state variable definitions. */
+
+static void
+cmd_qtsstm (char *packet)
+{
+ trace_debug ("Returning static tracepoint");
+
+ if (next_st)
+ response_ust_marker (packet, next_st);
+ else
+ strcpy (packet, "l");
+}
+
+/* Disconnect the GDB probe from a marker at a given address. */
+
+static void
+unprobe_marker_at (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+
+ p += sizeof ("unprobe_marker_at:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+ for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
+ if ((uintptr_t ) iter.marker->location == address)
+ {
+ int result;
+
+ result = USTF(ltt_marker_disconnect) (iter.marker->channel,
+ iter.marker->name,
+ GDB_PROBE_NAME);
+ if (result < 0)
+ warning ("could not disable marker %s/%s",
+ iter.marker->channel, iter.marker->name);
+ break;
+ }
+}
+
+/* Connect the GDB probe to a marker at a given address. */
+
+static int
+probe_marker_at (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+ struct marker *m;
+
+ p += sizeof ("probe_marker_at:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+
+ for (USTF(marker_iter_start) (&iter), m = iter.marker;
+ m != NULL;
+ USTF(marker_iter_next) (&iter), m = iter.marker)
+ if ((uintptr_t ) m->location == address)
+ {
+ int result;
+
+ trace_debug ("found marker for address. "
+ "ltt_marker_connect (marker = %s/%s)",
+ m->channel, m->name);
+
+ result = USTF(ltt_marker_connect) (m->channel, m->name,
+ GDB_PROBE_NAME);
+ if (result && result != -EEXIST)
+ trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
+ m->channel, m->name, -result);
+
+ if (result < 0)
+ {
+ sprintf (packet, "E.could not connect marker: channel=%s, name=%s",
+ m->channel, m->name);
+ return -1;
+ }
+
+ strcpy (packet, "OK");
+ return 0;
+ }
+
+ sprintf (packet, "E.no marker found at 0x%s", paddress (address));
+ return -1;
+}
+
+static int
+cmd_qtstmat (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+ struct marker *m;
+
+ p += sizeof ("qTSTMat:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+
+ for (USTF(marker_iter_start) (&iter), m = iter.marker;
+ m != NULL;
+ USTF(marker_iter_next) (&iter), m = iter.marker)
+ if ((uintptr_t ) m->location == address)
+ {
+ response_ust_marker (packet, m);
+ return 0;
+ }
+
+ strcpy (packet, "l");
+ return -1;
+}
+
+static void
+gdb_ust_init (void)
+{
+ if (!dlsym_ust ())
+ return;
+
+ USTF(ltt_probe_register) (&gdb_ust_probe);
+}
+
+#endif /* HAVE_UST */
+
+#include <sys/syscall.h>
+#include <stdlib.h>
+
+static void
+gdb_agent_remove_socket (void)
+{
+ unlink (agent_socket_name);
+}
+
+/* Helper thread of agent. */
+
+static void *
+gdb_agent_helper_thread (void *arg)
+{
+ int listen_fd;
+
+ atexit (gdb_agent_remove_socket);
+
+ while (1)
+ {
+ listen_fd = gdb_agent_socket_init ();
+
+ if (helper_thread_id == 0)
+ helper_thread_id = syscall (SYS_gettid);
+
+ if (listen_fd == -1)
+ {
+ warning ("could not create sync socket\n");
+ break;
+ }
+
+ while (1)
+ {
+ socklen_t tmp;
+ struct sockaddr_un sockaddr;
+ int fd;
+ char buf[1];
+ int ret;
+ int stop_loop = 0;
+
+ tmp = sizeof (sockaddr);
+
+ do
+ {
+ fd = accept (listen_fd, &sockaddr, &tmp);
+ }
+ /* It seems an ERESTARTSYS can escape out of accept. */
+ while (fd == -512 || (fd == -1 && errno == EINTR));
+
+ if (fd < 0)
+ {
+ warning ("Accept returned %d, error: %s\n",
+ fd, strerror (errno));
+ break;
+ }
+
+ do
+ {
+ ret = read (fd, buf, 1);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1)
+ {
+ warning ("reading socket (fd=%d) failed with %s",
+ fd, strerror (errno));
+ close (fd);
+ break;
+ }
+
+ if (cmd_buf[0])
+ {
+ if (strncmp ("close", cmd_buf, 5) == 0)
+ {
+ stop_loop = 1;
+ }
+#ifdef HAVE_UST
+ else if (strcmp ("qTfSTM", cmd_buf) == 0)
+ {
+ cmd_qtfstm (cmd_buf);
+ }
+ else if (strcmp ("qTsSTM", cmd_buf) == 0)
+ {
+ cmd_qtsstm (cmd_buf);
+ }
+ else if (strncmp ("unprobe_marker_at:",
+ cmd_buf,
+ sizeof ("unprobe_marker_at:") - 1) == 0)
+ {
+ unprobe_marker_at (cmd_buf);
+ }
+ else if (strncmp ("probe_marker_at:",
+ cmd_buf,
+ sizeof ("probe_marker_at:") - 1) == 0)
+ {
+ probe_marker_at (cmd_buf);
+ }
+ else if (strncmp ("qTSTMat:",
+ cmd_buf,
+ sizeof ("qTSTMat:") - 1) == 0)
+ {
+ cmd_qtstmat (cmd_buf);
+ }
+#endif /* HAVE_UST */
+ }
+
+ /* Fix compiler's warning: ignoring return value of 'write'. */
+ ret = write (fd, buf, 1);
+ close (fd);
+
+ if (stop_loop)
+ {
+ close (listen_fd);
+ unlink (agent_socket_name);
+
+ /* Sleep endlessly to wait the whole inferior stops. This
+ thread can not exit because GDB or GDBserver may still need
+ 'current_inferior' (representing this thread) to access
+ inferior memory. Otherwise, this thread exits earlier than
+ other threads, and 'current_inferior' is set to NULL. */
+ while (1)
+ sleep (10);
+ }
+ }
+ }
+
+ return NULL;
+}
+
+#include <signal.h>
+#include <pthread.h>
+
+IP_AGENT_EXPORT int gdb_agent_capability = AGENT_CAPA_STATIC_TRACE;
+
+static void
+gdb_agent_init (void)
+{
+ int res;
+ pthread_t thread;
+ sigset_t new_mask;
+ sigset_t orig_mask;
+
+ /* We want the helper thread to be as transparent as possible, so
+ have it inherit an all-signals-blocked mask. */
+
+ sigfillset (&new_mask);
+ res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask);
+ if (res)
+ fatal ("pthread_sigmask (1) failed: %s", strerror (res));
+
+ res = pthread_create (&thread,
+ NULL,
+ gdb_agent_helper_thread,
+ NULL);
+
+ res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL);
+ if (res)
+ fatal ("pthread_sigmask (2) failed: %s", strerror (res));
+
+ while (helper_thread_id == 0)
+ usleep (1);
+
+#ifdef HAVE_UST
+ gdb_ust_init ();
+#endif
+}
+
+#include <sys/mman.h>
+#include <fcntl.h>
+
+IP_AGENT_EXPORT char *gdb_tp_heap_buffer;
+IP_AGENT_EXPORT char *gdb_jump_pad_buffer;
+IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end;
+IP_AGENT_EXPORT char *gdb_trampoline_buffer;
+IP_AGENT_EXPORT char *gdb_trampoline_buffer_end;
+IP_AGENT_EXPORT char *gdb_trampoline_buffer_error;
+
+/* Record the result of getting buffer space for fast tracepoint
+ trampolines. Any error message is copied, since caller may not be
+ using persistent storage. */
+
+void
+set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg)
+{
+ gdb_trampoline_buffer = (char *) (uintptr_t) begin;
+ gdb_trampoline_buffer_end = (char *) (uintptr_t) end;
+ if (errmsg)
+ strncpy (gdb_trampoline_buffer_error, errmsg, 99);
+ else
+ strcpy (gdb_trampoline_buffer_error, "no buffer passed");
+}
+
+static void __attribute__ ((constructor))
+initialize_tracepoint_ftlib (void)
+{
+ initialize_tracepoint ();
+
+ gdb_agent_init ();
+}
+
+#endif /* IN_PROCESS_AGENT */
+
+/* Return a timestamp, expressed as microseconds of the usual Unix
+ time. (As the result is a 64-bit number, it will not overflow any
+ time soon.) */
+
+static LONGEST
+get_timestamp (void)
+{
+ struct timeval tv;
+
+ if (gettimeofday (&tv, 0) != 0)
+ return -1;
+ else
+ return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec;
+}
+
+void
+initialize_tracepoint (void)
+{
+ /* Start with the default size. */
+ init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE);
+
+ /* Wire trace state variable 1 to be the timestamp. This will be
+ uploaded to GDB upon connection and become one of its trace state
+ variables. (In case you're wondering, if GDB already has a trace
+ variable numbered 1, it will be renumbered.) */
+ create_trace_state_variable (1, 0);
+ set_trace_state_variable_name (1, "trace_timestamp");
+ set_trace_state_variable_getter (1, get_timestamp);
+
+#ifdef IN_PROCESS_AGENT
+ {
+ uintptr_t addr;
+ int pagesize;
+
+ pagesize = sysconf (_SC_PAGE_SIZE);
+ if (pagesize == -1)
+ fatal ("sysconf");
+
+ gdb_tp_heap_buffer = xmalloc (5 * 1024 * 1024);
+
+#define SCRATCH_BUFFER_NPAGES 20
+
+ /* Allocate scratch buffer aligned on a page boundary, at a low
+ address (close to the main executable's code). */
+ for (addr = pagesize; addr != 0; addr += pagesize)
+ {
+ gdb_jump_pad_buffer = mmap ((void *) addr, pagesize * SCRATCH_BUFFER_NPAGES,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ -1, 0);
+ if (gdb_jump_pad_buffer != MAP_FAILED)
+ break;
+ }
+
+ if (addr == 0)
+ fatal ("\
+initialize_tracepoint: mmap'ing jump pad buffer failed with %s",
+ strerror (errno));
+
+ gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * SCRATCH_BUFFER_NPAGES;
+ }
+
+ gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0;
+
+ /* It's not a fatal error for something to go wrong with trampoline
+ buffer setup, but it can be mysterious, so create a channel to
+ report back on what went wrong, using a fixed size since we may
+ not be able to allocate space later when the problem occurs. */
+ gdb_trampoline_buffer_error = xmalloc (IPA_BUFSIZ);
+
+ strcpy (gdb_trampoline_buffer_error, "No errors reported");
+
+ initialize_low_tracepoint ();
+#endif
}
projects / deliverable / binutils-gdb.git / blobdiff