/* Native-dependent code for the i386.
- Copyright (C) 2001, 2004, 2005, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2014 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#include "i386-nat.h"
#include "defs.h"
-#include "breakpoint.h"
-#include "command.h"
+#include "i386-nat.h"
#include "gdbcmd.h"
-#include "target.h"
-#include "gdb_assert.h"
+#include "inferior.h"
/* Support for hardware watchpoints and breakpoints using the i386
debug registers.
The functions below implement debug registers sharing by reference
counts, and allow to watch regions up to 16 bytes long. */
-struct i386_dr_low_type i386_dr_low;
-
+/* Whether or not to print the mirrored debug registers. */
+int debug_hw_points;
-/* Support for 8-byte wide hw watchpoints. */
-#define TARGET_HAS_DR_LEN_8 (i386_dr_low.debug_register_length == 8)
-
-/* Debug registers' indices. */
-#define DR_NADDR 4 /* The number of debug address registers. */
-#define DR_STATUS 6 /* Index of debug status register (DR6). */
-#define DR_CONTROL 7 /* Index of debug control register (DR7). */
-
-/* DR7 Debug Control register fields. */
-
-/* How many bits to skip in DR7 to get to R/W and LEN fields. */
-#define DR_CONTROL_SHIFT 16
-/* How many bits in DR7 per R/W and LEN field for each watchpoint. */
-#define DR_CONTROL_SIZE 4
-
-/* Watchpoint/breakpoint read/write fields in DR7. */
-#define DR_RW_EXECUTE (0x0) /* Break on instruction execution. */
-#define DR_RW_WRITE (0x1) /* Break on data writes. */
-#define DR_RW_READ (0x3) /* Break on data reads or writes. */
-
-/* This is here for completeness. No platform supports this
- functionality yet (as of March 2001). Note that the DE flag in the
- CR4 register needs to be set to support this. */
-#ifndef DR_RW_IORW
-#define DR_RW_IORW (0x2) /* Break on I/O reads or writes. */
-#endif
-
-/* Watchpoint/breakpoint length fields in DR7. The 2-bit left shift
- is so we could OR this with the read/write field defined above. */
-#define DR_LEN_1 (0x0 << 2) /* 1-byte region watch or breakpoint. */
-#define DR_LEN_2 (0x1 << 2) /* 2-byte region watch. */
-#define DR_LEN_4 (0x3 << 2) /* 4-byte region watch. */
-#define DR_LEN_8 (0x2 << 2) /* 8-byte region watch (AMD64). */
-
-/* Local and Global Enable flags in DR7.
-
- When the Local Enable flag is set, the breakpoint/watchpoint is
- enabled only for the current task; the processor automatically
- clears this flag on every task switch. When the Global Enable flag
- is set, the breakpoint/watchpoint is enabled for all tasks; the
- processor never clears this flag.
-
- Currently, all watchpoint are locally enabled. If you need to
- enable them globally, read the comment which pertains to this in
- i386_insert_aligned_watchpoint below. */
-#define DR_LOCAL_ENABLE_SHIFT 0 /* Extra shift to the local enable bit. */
-#define DR_GLOBAL_ENABLE_SHIFT 1 /* Extra shift to the global enable bit. */
-#define DR_ENABLE_SIZE 2 /* Two enable bits per debug register. */
-
-/* Local and global exact breakpoint enable flags (a.k.a. slowdown
- flags). These are only required on i386, to allow detection of the
- exact instruction which caused a watchpoint to break; i486 and
- later processors do that automatically. We set these flags for
- backwards compatibility. */
-#define DR_LOCAL_SLOWDOWN (0x100)
-#define DR_GLOBAL_SLOWDOWN (0x200)
-
-/* Fields reserved by Intel. This includes the GD (General Detect
- Enable) flag, which causes a debug exception to be generated when a
- MOV instruction accesses one of the debug registers.
-
- FIXME: My Intel manual says we should use 0xF800, not 0xFC00. */
-#define DR_CONTROL_RESERVED (0xFC00)
-
-/* Auxiliary helper macros. */
-
-/* A value that masks all fields in DR7 that are reserved by Intel. */
-#define I386_DR_CONTROL_MASK (~DR_CONTROL_RESERVED)
-
-/* The I'th debug register is vacant if its Local and Global Enable
- bits are reset in the Debug Control register. */
-#define I386_DR_VACANT(state, i) \
- (((state)->dr_control_mirror & (3 << (DR_ENABLE_SIZE * (i)))) == 0)
-
-/* Locally enable the break/watchpoint in the I'th debug register. */
-#define I386_DR_LOCAL_ENABLE(state, i) \
- do { \
- (state)->dr_control_mirror |= \
- (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i))); \
- } while (0)
-
-/* Globally enable the break/watchpoint in the I'th debug register. */
-#define I386_DR_GLOBAL_ENABLE(state, i) \
- do { \
- (state)->dr_control_mirror |= \
- (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * (i))); \
- } while (0)
-
-/* Disable the break/watchpoint in the I'th debug register. */
-#define I386_DR_DISABLE(state, i) \
- do { \
- (state)->dr_control_mirror &= \
- ~(3 << (DR_ENABLE_SIZE * (i))); \
- } while (0)
-
-/* Set in DR7 the RW and LEN fields for the I'th debug register. */
-#define I386_DR_SET_RW_LEN(state, i, rwlen) \
- do { \
- (state)->dr_control_mirror &= \
- ~(0x0f << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))); \
- (state)->dr_control_mirror |= \
- ((rwlen) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))); \
- } while (0)
-
-/* Get from DR7 the RW and LEN fields for the I'th debug register. */
-#define I386_DR_GET_RW_LEN(dr7, i) \
- (((dr7) \
- >> (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * (i))) & 0x0f)
-
-/* Mask that this I'th watchpoint has triggered. */
-#define I386_DR_WATCH_MASK(i) (1 << (i))
-
-/* Did the watchpoint whose address is in the I'th register break? */
-#define I386_DR_WATCH_HIT(dr6, i) ((dr6) & (1 << (i)))
-
-/* A macro to loop over all debug registers. */
-#define ALL_DEBUG_REGISTERS(i) for (i = 0; i < DR_NADDR; i++)
-
-
-/* Global state needed to track h/w watchpoints. */
-
-struct i386_debug_reg_state
-{
- /* Mirror the inferior's DRi registers. We keep the status and
- control registers separated because they don't hold addresses.
- Note that since we can change these mirrors while threads are
- running, we never trust them to explain a cause of a trap.
- For that, we need to peek directly in the inferior registers. */
- CORE_ADDR dr_mirror[DR_NADDR];
- unsigned dr_status_mirror, dr_control_mirror;
-
- /* Reference counts for each debug register. */
- int dr_ref_count[DR_NADDR];
-};
+/* Low-level function vector. */
+struct i386_dr_low_type i386_dr_low;
-/* Clear the reference counts and forget everything we knew about the
- debug registers. */
+/* Per-process data. We don't bind this to a per-inferior registry
+ because of targets like x86 GNU/Linux that need to keep track of
+ processes that aren't bound to any inferior (e.g., fork children,
+ checkpoints). */
-static void
-i386_init_dregs (struct i386_debug_reg_state *state)
+struct i386_process_info
{
- int i;
+ /* Linked list. */
+ struct i386_process_info *next;
- ALL_DEBUG_REGISTERS (i)
- {
- state->dr_mirror[i] = 0;
- state->dr_ref_count[i] = 0;
- }
- state->dr_control_mirror = 0;
- state->dr_status_mirror = 0;
-}
+ /* The process identifier. */
+ pid_t pid;
-static struct i386_debug_reg_state dr_mirror;
+ /* Copy of i386 hardware debug registers. */
+ struct i386_debug_reg_state state;
+};
-/* Whether or not to print the mirrored debug registers. */
-static int maint_show_dr;
-
-/* Types of operations supported by i386_handle_nonaligned_watchpoint. */
-typedef enum { WP_INSERT, WP_REMOVE, WP_COUNT } i386_wp_op_t;
-
-/* Internal functions. */
-
-/* Return the value of a 4-bit field for DR7 suitable for watching a
- region of LEN bytes for accesses of type TYPE. LEN is assumed to
- have the value of 1, 2, or 4. */
-static unsigned i386_length_and_rw_bits (int len, enum target_hw_bp_type type);
-
-/* Insert a watchpoint at address ADDR, which is assumed to be aligned
- according to the length of the region to watch. LEN_RW_BITS is the
- value of the bit-field from DR7 which describes the length and
- access type of the region to be watched by this watchpoint. Return
- 0 on success, -1 on failure. */
-static int i386_insert_aligned_watchpoint (struct i386_debug_reg_state *state,
- CORE_ADDR addr,
- unsigned len_rw_bits);
-
-/* Remove a watchpoint at address ADDR, which is assumed to be aligned
- according to the length of the region to watch. LEN_RW_BITS is the
- value of the bits from DR7 which describes the length and access
- type of the region watched by this watchpoint. Return 0 on
- success, -1 on failure. */
-static int i386_remove_aligned_watchpoint (struct i386_debug_reg_state *state,
- CORE_ADDR addr,
- unsigned len_rw_bits);
-
-/* Insert or remove a (possibly non-aligned) watchpoint, or count the
- number of debug registers required to watch a region at address
- ADDR whose length is LEN for accesses of type TYPE. Return 0 on
- successful insertion or removal, a positive number when queried
- about the number of registers, or -1 on failure. If WHAT is not a
- valid value, bombs through internal_error. */
-static int i386_handle_nonaligned_watchpoint (struct i386_debug_reg_state *state,
- i386_wp_op_t what,
- CORE_ADDR addr, int len,
- enum target_hw_bp_type type);
-
-/* Implementation. */
+static struct i386_process_info *i386_process_list = NULL;
-/* Clear the reference counts and forget everything we knew about the
- debug registers. */
+/* Find process data for process PID. */
-void
-i386_cleanup_dregs (void)
+static struct i386_process_info *
+i386_find_process_pid (pid_t pid)
{
- i386_init_dregs (&dr_mirror);
-}
+ struct i386_process_info *proc;
-/* Print the values of the mirrored debug registers. This is called
- when maint_show_dr is non-zero. To set that up, type "maint
- show-debug-regs" at GDB's prompt. */
+ for (proc = i386_process_list; proc; proc = proc->next)
+ if (proc->pid == pid)
+ return proc;
-static void
-i386_show_dr (struct i386_debug_reg_state *state,
- const char *func, CORE_ADDR addr,
- int len, enum target_hw_bp_type type)
-{
- int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
- int i;
-
- puts_unfiltered (func);
- if (addr || len)
- printf_unfiltered (" (addr=%lx, len=%d, type=%s)",
- /* This code is for ia32, so casting CORE_ADDR
- to unsigned long should be okay. */
- (unsigned long)addr, len,
- type == hw_write ? "data-write"
- : (type == hw_read ? "data-read"
- : (type == hw_access ? "data-read/write"
- : (type == hw_execute ? "instruction-execute"
- /* FIXME: if/when I/O read/write
- watchpoints are supported, add them
- here. */
- : "??unknown??"))));
- puts_unfiltered (":\n");
- printf_unfiltered ("\tCONTROL (DR7): %s STATUS (DR6): %s\n",
- phex (state->dr_control_mirror, 8),
- phex (state->dr_status_mirror, 8));
- ALL_DEBUG_REGISTERS(i)
- {
- printf_unfiltered ("\
-\tDR%d: addr=0x%s, ref.count=%d DR%d: addr=0x%s, ref.count=%d\n",
- i, phex (state->dr_mirror[i], addr_size),
- state->dr_ref_count[i],
- i + 1, phex (state->dr_mirror[i + 1], addr_size),
- state->dr_ref_count[i+1]);
- i++;
- }
+ return NULL;
}
-/* Return the value of a 4-bit field for DR7 suitable for watching a
- region of LEN bytes for accesses of type TYPE. LEN is assumed to
- have the value of 1, 2, or 4. */
+/* Add process data for process PID. Returns newly allocated info
+ object. */
-static unsigned
-i386_length_and_rw_bits (int len, enum target_hw_bp_type type)
+static struct i386_process_info *
+i386_add_process (pid_t pid)
{
- unsigned rw;
+ struct i386_process_info *proc;
- switch (type)
- {
- case hw_execute:
- rw = DR_RW_EXECUTE;
- break;
- case hw_write:
- rw = DR_RW_WRITE;
- break;
- case hw_read:
- internal_error (__FILE__, __LINE__,
- _("The i386 doesn't support "
- "data-read watchpoints.\n"));
- case hw_access:
- rw = DR_RW_READ;
- break;
-#if 0
- /* Not yet supported. */
- case hw_io_access:
- rw = DR_RW_IORW;
- break;
-#endif
- default:
- internal_error (__FILE__, __LINE__, _("\
-Invalid hardware breakpoint type %d in i386_length_and_rw_bits.\n"),
- (int) type);
- }
+ proc = xcalloc (1, sizeof (*proc));
+ proc->pid = pid;
- switch (len)
- {
- case 1:
- return (DR_LEN_1 | rw);
- case 2:
- return (DR_LEN_2 | rw);
- case 4:
- return (DR_LEN_4 | rw);
- case 8:
- if (TARGET_HAS_DR_LEN_8)
- return (DR_LEN_8 | rw);
- /* ELSE FALL THROUGH */
- default:
- internal_error (__FILE__, __LINE__, _("\
-Invalid hardware breakpoint length %d in i386_length_and_rw_bits.\n"), len);
- }
+ proc->next = i386_process_list;
+ i386_process_list = proc;
+
+ return proc;
}
-/* Insert a watchpoint at address ADDR, which is assumed to be aligned
- according to the length of the region to watch. LEN_RW_BITS is the
- value of the bits from DR7 which describes the length and access
- type of the region to be watched by this watchpoint. Return 0 on
- success, -1 on failure. */
+/* Get data specific info for process PID, creating it if necessary.
+ Never returns NULL. */
-static int
-i386_insert_aligned_watchpoint (struct i386_debug_reg_state *state,
- CORE_ADDR addr, unsigned len_rw_bits)
+static struct i386_process_info *
+i386_process_info_get (pid_t pid)
{
- int i;
-
- if (!i386_dr_low.set_addr || !i386_dr_low.set_control)
- return -1;
-
- /* First, look for an occupied debug register with the same address
- and the same RW and LEN definitions. If we find one, we can
- reuse it for this watchpoint as well (and save a register). */
- ALL_DEBUG_REGISTERS(i)
- {
- if (!I386_DR_VACANT (state, i)
- && state->dr_mirror[i] == addr
- && I386_DR_GET_RW_LEN (state->dr_control_mirror, i) == len_rw_bits)
- {
- state->dr_ref_count[i]++;
- return 0;
- }
- }
+ struct i386_process_info *proc;
- /* Next, look for a vacant debug register. */
- ALL_DEBUG_REGISTERS(i)
- {
- if (I386_DR_VACANT (state, i))
- break;
- }
+ proc = i386_find_process_pid (pid);
+ if (proc == NULL)
+ proc = i386_add_process (pid);
- /* No more debug registers! */
- if (i >= DR_NADDR)
- return -1;
-
- /* Now set up the register I to watch our region. */
-
- /* Record the info in our local mirrored array. */
- state->dr_mirror[i] = addr;
- state->dr_ref_count[i] = 1;
- I386_DR_SET_RW_LEN (state, i, len_rw_bits);
- /* Note: we only enable the watchpoint locally, i.e. in the current
- task. Currently, no i386 target allows or supports global
- watchpoints; however, if any target would want that in the
- future, GDB should probably provide a command to control whether
- to enable watchpoints globally or locally, and the code below
- should use global or local enable and slow-down flags as
- appropriate. */
- I386_DR_LOCAL_ENABLE (state, i);
- state->dr_control_mirror |= DR_LOCAL_SLOWDOWN;
- state->dr_control_mirror &= I386_DR_CONTROL_MASK;
-
- return 0;
+ return proc;
}
-/* Remove a watchpoint at address ADDR, which is assumed to be aligned
- according to the length of the region to watch. LEN_RW_BITS is the
- value of the bits from DR7 which describes the length and access
- type of the region watched by this watchpoint. Return 0 on
- success, -1 on failure. */
+/* Get debug registers state for process PID. */
-static int
-i386_remove_aligned_watchpoint (struct i386_debug_reg_state *state,
- CORE_ADDR addr, unsigned len_rw_bits)
+struct i386_debug_reg_state *
+i386_debug_reg_state (pid_t pid)
{
- int i, retval = -1;
-
- ALL_DEBUG_REGISTERS(i)
- {
- if (!I386_DR_VACANT (state, i)
- && state->dr_mirror[i] == addr
- && I386_DR_GET_RW_LEN (state->dr_control_mirror, i) == len_rw_bits)
- {
- if (--state->dr_ref_count[i] == 0) /* no longer in use? */
- {
- /* Reset our mirror. */
- state->dr_mirror[i] = 0;
- I386_DR_DISABLE (state, i);
- }
- retval = 0;
- }
- }
-
- return retval;
+ return &i386_process_info_get (pid)->state;
}
-/* Insert or remove a (possibly non-aligned) watchpoint, or count the
- number of debug registers required to watch a region at address
- ADDR whose length is LEN for accesses of type TYPE. Return 0 on
- successful insertion or removal, a positive number when queried
- about the number of registers, or -1 on failure. If WHAT is not a
- valid value, bombs through internal_error. */
+/* See declaration in i386-nat.h. */
-static int
-i386_handle_nonaligned_watchpoint (struct i386_debug_reg_state *state,
- i386_wp_op_t what, CORE_ADDR addr, int len,
- enum target_hw_bp_type type)
+void
+i386_forget_process (pid_t pid)
{
- int retval = 0;
- int max_wp_len = TARGET_HAS_DR_LEN_8 ? 8 : 4;
-
- static int size_try_array[8][8] =
- {
- {1, 1, 1, 1, 1, 1, 1, 1}, /* Trying size one. */
- {2, 1, 2, 1, 2, 1, 2, 1}, /* Trying size two. */
- {2, 1, 2, 1, 2, 1, 2, 1}, /* Trying size three. */
- {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size four. */
- {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size five. */
- {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size six. */
- {4, 1, 2, 1, 4, 1, 2, 1}, /* Trying size seven. */
- {8, 1, 2, 1, 4, 1, 2, 1}, /* Trying size eight. */
- };
-
- while (len > 0)
- {
- int align = addr % max_wp_len;
- /* Four (eight on AMD64) is the maximum length a debug register
- can watch. */
- int try = (len > max_wp_len ? (max_wp_len - 1) : len - 1);
- int size = size_try_array[try][align];
+ struct i386_process_info *proc, **proc_link;
- if (what == WP_COUNT)
- {
- /* size_try_array[] is defined such that each iteration
- through the loop is guaranteed to produce an address and a
- size that can be watched with a single debug register.
- Thus, for counting the registers required to watch a
- region, we simply need to increment the count on each
- iteration. */
- retval++;
- }
- else
+ proc = i386_process_list;
+ proc_link = &i386_process_list;
+
+ while (proc != NULL)
+ {
+ if (proc->pid == pid)
{
- unsigned len_rw = i386_length_and_rw_bits (size, type);
-
- if (what == WP_INSERT)
- retval = i386_insert_aligned_watchpoint (state, addr, len_rw);
- else if (what == WP_REMOVE)
- retval = i386_remove_aligned_watchpoint (state, addr, len_rw);
- else
- internal_error (__FILE__, __LINE__, _("\
-Invalid value %d of operation in i386_handle_nonaligned_watchpoint.\n"),
- (int)what);
- if (retval)
- break;
+ *proc_link = proc->next;
+
+ xfree (proc);
+ return;
}
- addr += size;
- len -= size;
+ proc_link = &proc->next;
+ proc = *proc_link;
}
-
- return retval;
}
-/* Update the inferior's debug registers with the new debug registers
- state, in NEW_STATE, and then update our local mirror to match. */
+/* Clear the reference counts and forget everything we knew about the
+ debug registers. */
-static void
-i386_update_inferior_debug_regs (struct i386_debug_reg_state *new_state)
+void
+i386_cleanup_dregs (void)
{
- int i;
-
- ALL_DEBUG_REGISTERS (i)
- {
- if (I386_DR_VACANT (new_state, i) != I386_DR_VACANT (&dr_mirror, i))
- {
- if (!I386_DR_VACANT (new_state, i))
- {
- i386_dr_low.set_addr (i, new_state->dr_mirror[i]);
-
- /* Only a sanity check for leftover bits (set possibly only
- by inferior). */
- if (i386_dr_low.unset_status)
- i386_dr_low.unset_status (I386_DR_WATCH_MASK (i));
- }
- else
- {
- if (i386_dr_low.reset_addr)
- i386_dr_low.reset_addr (i);
- }
- }
- else
- gdb_assert (new_state->dr_mirror[i] == dr_mirror.dr_mirror[i]);
- }
-
- if (new_state->dr_control_mirror != dr_mirror.dr_control_mirror)
- i386_dr_low.set_control (new_state->dr_control_mirror);
-
- dr_mirror = *new_state;
+ /* Starting from scratch has the same effect. */
+ i386_forget_process (ptid_get_pid (inferior_ptid));
}
/* Insert a watchpoint to watch a memory region which starts at
of the type TYPE. Return 0 on success, -1 on failure. */
static int
-i386_insert_watchpoint (CORE_ADDR addr, int len, int type,
+i386_insert_watchpoint (struct target_ops *self,
+ CORE_ADDR addr, int len, int type,
struct expression *cond)
{
- int retval;
- /* Work on a local copy of the debug registers, and on success,
- commit the change back to the inferior. */
- struct i386_debug_reg_state local_state = dr_mirror;
-
- if (type == hw_read)
- return 1; /* unsupported */
-
- if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
- || addr % len != 0)
- retval = i386_handle_nonaligned_watchpoint (&local_state,
- WP_INSERT, addr, len, type);
- else
- {
- unsigned len_rw = i386_length_and_rw_bits (len, type);
-
- retval = i386_insert_aligned_watchpoint (&local_state,
- addr, len_rw);
- }
-
- if (retval == 0)
- i386_update_inferior_debug_regs (&local_state);
-
- if (maint_show_dr)
- i386_show_dr (&dr_mirror, "insert_watchpoint", addr, len, type);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- return retval;
+ return i386_dr_insert_watchpoint (state, type, addr, len);
}
/* Remove a watchpoint that watched the memory region which starts at
address ADDR, whose length is LEN bytes, and for accesses of the
type TYPE. Return 0 on success, -1 on failure. */
static int
-i386_remove_watchpoint (CORE_ADDR addr, int len, int type,
+i386_remove_watchpoint (struct target_ops *self,
+ CORE_ADDR addr, int len, int type,
struct expression *cond)
{
- int retval;
- /* Work on a local copy of the debug registers, and on success,
- commit the change back to the inferior. */
- struct i386_debug_reg_state local_state = dr_mirror;
-
- if (((len != 1 && len !=2 && len !=4) && !(TARGET_HAS_DR_LEN_8 && len == 8))
- || addr % len != 0)
- retval = i386_handle_nonaligned_watchpoint (&local_state,
- WP_REMOVE, addr, len, type);
- else
- {
- unsigned len_rw = i386_length_and_rw_bits (len, type);
-
- retval = i386_remove_aligned_watchpoint (&local_state,
- addr, len_rw);
- }
-
- if (retval == 0)
- i386_update_inferior_debug_regs (&local_state);
-
- if (maint_show_dr)
- i386_show_dr (&dr_mirror, "remove_watchpoint", addr, len, type);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- return retval;
+ return i386_dr_remove_watchpoint (state, type, addr, len);
}
/* Return non-zero if we can watch a memory region that starts at
address ADDR and whose length is LEN bytes. */
static int
-i386_region_ok_for_watchpoint (CORE_ADDR addr, int len)
+i386_region_ok_for_watchpoint (struct target_ops *self,
+ CORE_ADDR addr, int len)
{
- int nregs;
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- /* Compute how many aligned watchpoints we would need to cover this
- region. */
- nregs = i386_handle_nonaligned_watchpoint (&dr_mirror,
- WP_COUNT, addr, len, hw_write);
- return nregs <= DR_NADDR ? 1 : 0;
+ return i386_dr_region_ok_for_watchpoint (state, addr, len);
}
-/* If the inferior has some watchpoint that triggered, set the
- address associated with that watchpoint and return non-zero.
+/* If the inferior has some break/watchpoint that triggered, set the
+ address associated with that break/watchpoint and return non-zero.
Otherwise, return zero. */
static int
i386_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
{
- CORE_ADDR addr = 0;
- int i;
- int rc = 0;
- unsigned status;
- unsigned control;
- struct i386_debug_reg_state *state = &dr_mirror;
-
- dr_mirror.dr_status_mirror = i386_dr_low.get_status ();
- status = dr_mirror.dr_status_mirror;
- control = dr_mirror.dr_control_mirror;
-
- ALL_DEBUG_REGISTERS(i)
- {
- if (I386_DR_WATCH_HIT (status, i)
- /* This second condition makes sure DRi is set up for a data
- watchpoint, not a hardware breakpoint. The reason is
- that GDB doesn't call the target_stopped_data_address
- method except for data watchpoints. In other words, I'm
- being paranoiac. */
- && I386_DR_GET_RW_LEN (control, i) != 0
- /* This third condition makes sure DRi is not vacant, this
- avoids false positives in windows-nat.c. */
- && !I386_DR_VACANT (state, i))
- {
- addr = state->dr_mirror[i];
- rc = 1;
- if (maint_show_dr)
- i386_show_dr (&dr_mirror, "watchpoint_hit", addr, -1, hw_write);
- }
- }
- if (maint_show_dr && addr == 0)
- i386_show_dr (&dr_mirror, "stopped_data_addr", 0, 0, hw_write);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- if (rc)
- *addr_p = addr;
- return rc;
+ return i386_dr_stopped_data_address (state, addr_p);
}
+/* Return non-zero if the inferior has some watchpoint that triggered.
+ Otherwise return zero. */
+
static int
-i386_stopped_by_watchpoint (void)
+i386_stopped_by_watchpoint (struct target_ops *ops)
{
- CORE_ADDR addr = 0;
- return i386_stopped_data_address (¤t_target, &addr);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
+
+ return i386_dr_stopped_by_watchpoint (state);
}
/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
Return 0 on success, EBUSY on failure. */
+
static int
-i386_insert_hw_breakpoint (struct gdbarch *gdbarch,
+i386_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
- unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
- CORE_ADDR addr = bp_tgt->placed_address;
- /* Work on a local copy of the debug registers, and on success,
- commit the change back to the inferior. */
- struct i386_debug_reg_state local_state = dr_mirror;
- int retval = i386_insert_aligned_watchpoint (&local_state,
- addr, len_rw) ? EBUSY : 0;
-
- if (retval == 0)
- i386_update_inferior_debug_regs (&local_state);
-
- if (maint_show_dr)
- i386_show_dr (&dr_mirror, "insert_hwbp", addr, 1, hw_execute);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- return retval;
+ return i386_dr_insert_watchpoint (state, hw_execute,
+ bp_tgt->placed_address, 1) ? EBUSY : 0;
}
/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
Return 0 on success, -1 on failure. */
static int
-i386_remove_hw_breakpoint (struct gdbarch *gdbarch,
+i386_remove_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
- unsigned len_rw = i386_length_and_rw_bits (1, hw_execute);
- CORE_ADDR addr = bp_tgt->placed_address;
- /* Work on a local copy of the debug registers, and on success,
- commit the change back to the inferior. */
- struct i386_debug_reg_state local_state = dr_mirror;
- int retval = i386_remove_aligned_watchpoint (&local_state,
- addr, len_rw);
-
- if (retval == 0)
- i386_update_inferior_debug_regs (&local_state);
-
- if (maint_show_dr)
- i386_show_dr (&dr_mirror, "remove_hwbp", addr, 1, hw_execute);
+ struct i386_debug_reg_state *state
+ = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
- return retval;
+ return i386_dr_remove_watchpoint (state, hw_execute,
+ bp_tgt->placed_address, 1);
}
/* Returns the number of hardware watchpoints of type TYPE that we can
sharing implemented via reference counts in i386-nat.c. */
static int
-i386_can_use_hw_breakpoint (int type, int cnt, int othertype)
+i386_can_use_hw_breakpoint (struct target_ops *self,
+ int type, int cnt, int othertype)
{
return 1;
}
/* A maintenance command to enable printing the internal DRi mirror
variables. */
add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
- &maint_show_dr, _("\
+ &debug_hw_points, _("\
Set whether to show variables that mirror the x86 debug registers."), _("\
Show whether to show variables that mirror the x86 debug registers."), _("\
Use \"on\" to enable, \"off\" to disable.\n\
projects / deliverable / binutils-gdb.git / blobdiff