/* Memory breakpoint operations for the remote server for GDB.
- Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2002-2016 Free Software Foundation, Inc.
Contributed by MontaVista Software.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
-
-const unsigned char *breakpoint_data;
-int breakpoint_len;
+#include "regcache.h"
+#include "ax.h"
#define MAX_BREAKPOINT_LEN 8
+/* Helper macro used in loops that append multiple items to a singly-linked
+ list instead of inserting items at the head of the list, as, say, in the
+ breakpoint lists. LISTPP is a pointer to the pointer that is the head of
+ the new list. ITEMP is a pointer to the item to be added to the list.
+ TAILP must be defined to be the same type as ITEMP, and initialized to
+ NULL. */
+
+#define APPEND_TO_LIST(listpp, itemp, tailp) \
+ do \
+ { \
+ if ((tailp) == NULL) \
+ *(listpp) = (itemp); \
+ else \
+ (tailp)->next = (itemp); \
+ (tailp) = (itemp); \
+ } \
+ while (0)
+
/* GDB will never try to install multiple breakpoints at the same
- address. But, we need to keep track of internal breakpoints too,
- and so we do need to be able to install multiple breakpoints at the
- same address transparently. We keep track of two different, and
- closely related structures. A raw breakpoint, which manages the
- low level, close to the metal aspect of a breakpoint. It holds the
- breakpoint address, and a buffer holding a copy of the instructions
+ address. However, we can see GDB requesting to insert a breakpoint
+ at an address is had already inserted one previously in a few
+ situations.
+
+ - The RSP documentation on Z packets says that to avoid potential
+ problems with duplicate packets, the operations should be
+ implemented in an idempotent way.
+
+ - A breakpoint is set at ADDR, an address in a shared library.
+ Then the shared library is unloaded. And then another, unrelated,
+ breakpoint at ADDR is set. There is not breakpoint removal request
+ between the first and the second breakpoint.
+
+ - When GDB wants to update the target-side breakpoint conditions or
+ commands, it re-inserts the breakpoint, with updated
+ conditions/commands associated.
+
+ Also, we need to keep track of internal breakpoints too, so we do
+ need to be able to install multiple breakpoints at the same address
+ transparently.
+
+ We keep track of two different, and closely related structures. A
+ raw breakpoint, which manages the low level, close to the metal
+ aspect of a breakpoint. It holds the breakpoint address, and for
+ software breakpoints, a buffer holding a copy of the instructions
that would be in memory had not been a breakpoint there (we call
that the shadow memory of the breakpoint). We occasionally need to
temporarilly uninsert a breakpoint without the client knowing about
{
struct raw_breakpoint *next;
+ /* The low level type of the breakpoint (software breakpoint,
+ watchpoint, etc.) */
+ enum raw_bkpt_type raw_type;
+
/* A reference count. Each high level breakpoint referencing this
raw breakpoint accounts for one reference. */
int refcount;
breakpoint for a given PC. */
CORE_ADDR pc;
+ /* The breakpoint's kind. This is target specific. Most
+ architectures only use one specific instruction for breakpoints, while
+ others may use more than one. E.g., on ARM, we need to use different
+ breakpoint instructions on Thumb, Thumb-2, and ARM code. Likewise for
+ hardware breakpoints -- some architectures (including ARM) need to
+ setup debug registers differently depending on mode. */
+ int kind;
+
/* The breakpoint's shadow memory. */
unsigned char old_data[MAX_BREAKPOINT_LEN];
- /* Non-zero if this breakpoint is currently inserted in the
- inferior. */
+ /* Positive if this breakpoint is currently inserted in the
+ inferior. Negative if it was, but we've detected that it's now
+ gone. Zero if not inserted. */
int inserted;
-
- /* Non-zero if this breakpoint is currently disabled because we no
- longer detect it as inserted. */
- int shlib_disabled;
};
/* The type of a breakpoint. */
enum bkpt_type
{
/* A GDB breakpoint, requested with a Z0 packet. */
- gdb_breakpoint,
+ gdb_breakpoint_Z0,
+
+ /* A GDB hardware breakpoint, requested with a Z1 packet. */
+ gdb_breakpoint_Z1,
+
+ /* A GDB write watchpoint, requested with a Z2 packet. */
+ gdb_breakpoint_Z2,
+
+ /* A GDB read watchpoint, requested with a Z3 packet. */
+ gdb_breakpoint_Z3,
+
+ /* A GDB access watchpoint, requested with a Z4 packet. */
+ gdb_breakpoint_Z4,
/* A basic-software-single-step breakpoint. */
reinsert_breakpoint,
other_breakpoint,
};
+struct point_cond_list
+{
+ /* Pointer to the agent expression that is the breakpoint's
+ conditional. */
+ struct agent_expr *cond;
+
+ /* Pointer to the next condition. */
+ struct point_cond_list *next;
+};
+
+struct point_command_list
+{
+ /* Pointer to the agent expression that is the breakpoint's
+ commands. */
+ struct agent_expr *cmd;
+
+ /* Flag that is true if this command should run even while GDB is
+ disconnected. */
+ int persistence;
+
+ /* Pointer to the next command. */
+ struct point_command_list *next;
+};
+
/* A high level (in gdbserver's perspective) breakpoint. */
struct breakpoint
{
/* The breakpoint's type. */
enum bkpt_type type;
+ /* Pointer to the condition list that should be evaluated on
+ the target or NULL if the breakpoint is unconditional or
+ if GDB doesn't want us to evaluate the conditionals on the
+ target's side. */
+ struct point_cond_list *cond_list;
+
+ /* Point to the list of commands to run when this is hit. */
+ struct point_command_list *command_list;
+
/* Link to this breakpoint's raw breakpoint. This is always
non-NULL. */
struct raw_breakpoint *raw;
int (*handler) (CORE_ADDR);
};
+/* Return the breakpoint size from its kind. */
+
+static int
+bp_size (struct raw_breakpoint *bp)
+{
+ int size = 0;
+
+ the_target->sw_breakpoint_from_kind (bp->kind, &size);
+ return size;
+}
+
+/* Return the breakpoint opcode from its kind. */
+
+static const gdb_byte *
+bp_opcode (struct raw_breakpoint *bp)
+{
+ int size = 0;
+
+ return the_target->sw_breakpoint_from_kind (bp->kind, &size);
+}
+
+/* See mem-break.h. */
+
+enum target_hw_bp_type
+raw_bkpt_type_to_target_hw_bp_type (enum raw_bkpt_type raw_type)
+{
+ switch (raw_type)
+ {
+ case raw_bkpt_type_hw:
+ return hw_execute;
+ case raw_bkpt_type_write_wp:
+ return hw_write;
+ case raw_bkpt_type_read_wp:
+ return hw_read;
+ case raw_bkpt_type_access_wp:
+ return hw_access;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "bad raw breakpoint type %d", (int) raw_type);
+ }
+}
+
+/* See mem-break.h. */
+
+static enum bkpt_type
+Z_packet_to_bkpt_type (char z_type)
+{
+ gdb_assert ('0' <= z_type && z_type <= '4');
+
+ return (enum bkpt_type) (gdb_breakpoint_Z0 + (z_type - '0'));
+}
+
+/* See mem-break.h. */
+
+enum raw_bkpt_type
+Z_packet_to_raw_bkpt_type (char z_type)
+{
+ switch (z_type)
+ {
+ case Z_PACKET_SW_BP:
+ return raw_bkpt_type_sw;
+ case Z_PACKET_HW_BP:
+ return raw_bkpt_type_hw;
+ case Z_PACKET_WRITE_WP:
+ return raw_bkpt_type_write_wp;
+ case Z_PACKET_READ_WP:
+ return raw_bkpt_type_read_wp;
+ case Z_PACKET_ACCESS_WP:
+ return raw_bkpt_type_access_wp;
+ default:
+ gdb_assert_not_reached ("unhandled Z packet type.");
+ }
+}
+
+int
+any_persistent_commands (void)
+{
+ struct process_info *proc = current_process ();
+ struct breakpoint *bp;
+ struct point_command_list *cl;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ for (cl = bp->command_list; cl != NULL; cl = cl->next)
+ if (cl->persistence)
+ return 1;
+ }
+
+ return 0;
+}
+
+/* Find low-level breakpoint of type TYPE at address ADDR that is not
+ insert-disabled. Returns NULL if not found. */
+
static struct raw_breakpoint *
-find_raw_breakpoint_at (CORE_ADDR where)
+find_enabled_raw_code_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type)
{
struct process_info *proc = current_process ();
struct raw_breakpoint *bp;
for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
- if (bp->pc == where)
+ if (bp->pc == addr
+ && bp->raw_type == type
+ && bp->inserted >= 0)
return bp;
return NULL;
}
+/* Find low-level breakpoint of type TYPE at address ADDR. Returns
+ NULL if not found. */
+
static struct raw_breakpoint *
-set_raw_breakpoint_at (CORE_ADDR where)
+find_raw_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type, int kind)
{
struct process_info *proc = current_process ();
struct raw_breakpoint *bp;
- int err;
-
- if (breakpoint_data == NULL)
- error ("Target does not support breakpoints.");
- bp = find_raw_breakpoint_at (where);
- if (bp != NULL)
- {
- bp->refcount++;
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if (bp->pc == addr && bp->raw_type == type && bp->kind == kind)
return bp;
- }
- bp = xcalloc (1, sizeof (*bp));
- bp->pc = where;
- bp->refcount = 1;
+ return NULL;
+}
+
+/* See mem-break.h. */
+
+int
+insert_memory_breakpoint (struct raw_breakpoint *bp)
+{
+ unsigned char buf[MAX_BREAKPOINT_LEN];
+ int err;
/* Note that there can be fast tracepoint jumps installed in the
same memory range, so to get at the original memory, we need to
use read_inferior_memory, which masks those out. */
- err = read_inferior_memory (where, bp->old_data, breakpoint_len);
+ err = read_inferior_memory (bp->pc, buf, bp_size (bp));
if (err != 0)
{
if (debug_threads)
- fprintf (stderr,
- "Failed to read shadow memory of"
- " breakpoint at 0x%s (%s).\n",
- paddress (where), strerror (err));
- free (bp);
- return NULL;
+ debug_printf ("Failed to read shadow memory of"
+ " breakpoint at 0x%s (%s).\n",
+ paddress (bp->pc), strerror (err));
}
+ else
+ {
+ memcpy (bp->old_data, buf, bp_size (bp));
- err = (*the_target->write_memory) (where, breakpoint_data,
- breakpoint_len);
+ err = (*the_target->write_memory) (bp->pc, bp_opcode (bp),
+ bp_size (bp));
+ if (err != 0)
+ {
+ if (debug_threads)
+ debug_printf ("Failed to insert breakpoint at 0x%s (%s).\n",
+ paddress (bp->pc), strerror (err));
+ }
+ }
+ return err != 0 ? -1 : 0;
+}
+
+/* See mem-break.h */
+
+int
+remove_memory_breakpoint (struct raw_breakpoint *bp)
+{
+ unsigned char buf[MAX_BREAKPOINT_LEN];
+ int err;
+
+ /* Since there can be trap breakpoints inserted in the same address
+ range, we use `write_inferior_memory', which takes care of
+ layering breakpoints on top of fast tracepoints, and on top of
+ the buffer we pass it. This works because the caller has already
+ either unlinked the breakpoint or marked it uninserted. Also
+ note that we need to pass the current shadow contents, because
+ write_inferior_memory updates any shadow memory with what we pass
+ here, and we want that to be a nop. */
+ memcpy (buf, bp->old_data, bp_size (bp));
+ err = write_inferior_memory (bp->pc, buf, bp_size (bp));
if (err != 0)
{
if (debug_threads)
- fprintf (stderr,
- "Failed to insert breakpoint at 0x%s (%s).\n",
- paddress (where), strerror (err));
- free (bp);
- return NULL;
+ debug_printf ("Failed to uninsert raw breakpoint "
+ "at 0x%s (%s) while deleting it.\n",
+ paddress (bp->pc), strerror (err));
}
+ return err != 0 ? -1 : 0;
+}
+
+/* Set a RAW breakpoint of type TYPE and kind KIND at WHERE. On
+ success, a pointer to the new breakpoint is returned. On failure,
+ returns NULL and writes the error code to *ERR. */
+
+static struct raw_breakpoint *
+set_raw_breakpoint_at (enum raw_bkpt_type type, CORE_ADDR where, int kind,
+ int *err)
+{
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+ struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
- /* Link the breakpoint in. */
- bp->inserted = 1;
- bp->next = proc->raw_breakpoints;
- proc->raw_breakpoints = bp;
+ if (type == raw_bkpt_type_sw || type == raw_bkpt_type_hw)
+ {
+ bp = find_enabled_raw_code_breakpoint_at (where, type);
+ if (bp != NULL && bp->kind != kind)
+ {
+ /* A different kind than previously seen. The previous
+ breakpoint must be gone then. */
+ if (debug_threads)
+ debug_printf ("Inconsistent breakpoint kind? Was %d, now %d.\n",
+ bp->kind, kind);
+ bp->inserted = -1;
+ bp = NULL;
+ }
+ }
+ else
+ bp = find_raw_breakpoint_at (where, type, kind);
+
+ if (bp == NULL)
+ {
+ bp = XCNEW (struct raw_breakpoint);
+ bp->pc = where;
+ bp->kind = kind;
+ bp->raw_type = type;
+ make_cleanup (xfree, bp);
+ }
+
+ if (!bp->inserted)
+ {
+ *err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp);
+ if (*err != 0)
+ {
+ if (debug_threads)
+ debug_printf ("Failed to insert breakpoint at 0x%s (%d).\n",
+ paddress (where), *err);
+
+ do_cleanups (old_chain);
+ return NULL;
+ }
+
+ bp->inserted = 1;
+ }
+
+ discard_cleanups (old_chain);
+
+ /* Link the breakpoint in, if this is the first reference. */
+ if (++bp->refcount == 1)
+ {
+ bp->next = proc->raw_breakpoints;
+ proc->raw_breakpoints = bp;
+ }
return bp;
}
if (--bp->refcount == 0)
{
struct fast_tracepoint_jump *prev_bp_link = *bp_link;
+ unsigned char *buf;
/* Unlink it. */
*bp_link = bp->next;
pass the current shadow contents, because
write_inferior_memory updates any shadow memory with
what we pass here, and we want that to be a nop. */
- ret = write_inferior_memory (bp->pc,
- fast_tracepoint_jump_shadow (bp),
- bp->length);
+ buf = (unsigned char *) alloca (bp->length);
+ memcpy (buf, fast_tracepoint_jump_shadow (bp), bp->length);
+ ret = write_inferior_memory (bp->pc, buf, bp->length);
if (ret != 0)
{
/* Something went wrong, relink the jump. */
*bp_link = prev_bp_link;
if (debug_threads)
- fprintf (stderr,
- "Failed to uninsert fast tracepoint jump "
- "at 0x%s (%s) while deleting it.\n",
- paddress (bp->pc), strerror (ret));
+ debug_printf ("Failed to uninsert fast tracepoint jump "
+ "at 0x%s (%s) while deleting it.\n",
+ paddress (bp->pc), strerror (ret));
return ret;
}
return ENOENT;
}
+void
+inc_ref_fast_tracepoint_jump (struct fast_tracepoint_jump *jp)
+{
+ jp->refcount++;
+}
+
struct fast_tracepoint_jump *
set_fast_tracepoint_jump (CORE_ADDR where,
unsigned char *insn, ULONGEST length)
struct process_info *proc = current_process ();
struct fast_tracepoint_jump *jp;
int err;
+ unsigned char *buf;
/* We refcount fast tracepoint jumps. Check if we already know
about a jump at this address. */
/* We don't, so create a new object. Double the length, because the
flexible array member holds both the jump insn, and the
shadow. */
- jp = xcalloc (1, sizeof (*jp) + (length * 2));
+ jp = (struct fast_tracepoint_jump *) xcalloc (1, sizeof (*jp) + (length * 2));
jp->pc = where;
jp->length = length;
memcpy (fast_tracepoint_jump_insn (jp), insn, length);
jp->refcount = 1;
+ buf = (unsigned char *) alloca (length);
/* Note that there can be trap breakpoints inserted in the same
address range. To access the original memory contents, we use
`read_inferior_memory', which masks out breakpoints. */
- err = read_inferior_memory (where,
- fast_tracepoint_jump_shadow (jp), jp->length);
+ err = read_inferior_memory (where, buf, length);
if (err != 0)
{
if (debug_threads)
- fprintf (stderr,
- "Failed to read shadow memory of"
- " fast tracepoint at 0x%s (%s).\n",
- paddress (where), strerror (err));
+ debug_printf ("Failed to read shadow memory of"
+ " fast tracepoint at 0x%s (%s).\n",
+ paddress (where), strerror (err));
free (jp);
return NULL;
}
+ memcpy (fast_tracepoint_jump_shadow (jp), buf, length);
/* Link the jump in. */
jp->inserted = 1;
the current shadow contents, because write_inferior_memory
updates any shadow memory with what we pass here, and we want
that to be a nop. */
- err = write_inferior_memory (where, fast_tracepoint_jump_shadow (jp), length);
+ err = write_inferior_memory (where, buf, length);
if (err != 0)
{
if (debug_threads)
- fprintf (stderr,
- "Failed to insert fast tracepoint jump at 0x%s (%s).\n",
- paddress (where), strerror (err));
+ debug_printf ("Failed to insert fast tracepoint jump at 0x%s (%s).\n",
+ paddress (where), strerror (err));
/* Unlink it. */
proc->fast_tracepoint_jumps = jp->next;
/* This can happen when we remove all breakpoints while handling
a step-over. */
if (debug_threads)
- fprintf (stderr,
- "Could not find fast tracepoint jump at 0x%s "
- "in list (uninserting).\n",
- paddress (pc));
+ debug_printf ("Could not find fast tracepoint jump at 0x%s "
+ "in list (uninserting).\n",
+ paddress (pc));
return;
}
if (jp->inserted)
{
+ unsigned char *buf;
+
jp->inserted = 0;
/* Since there can be trap breakpoints inserted in the same
pass the current shadow contents, because
write_inferior_memory updates any shadow memory with what we
pass here, and we want that to be a nop. */
- err = write_inferior_memory (jp->pc,
- fast_tracepoint_jump_shadow (jp),
- jp->length);
+ buf = (unsigned char *) alloca (jp->length);
+ memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length);
+ err = write_inferior_memory (jp->pc, buf, jp->length);
if (err != 0)
{
jp->inserted = 1;
if (debug_threads)
- fprintf (stderr,
- "Failed to uninsert fast tracepoint jump at 0x%s (%s).\n",
- paddress (pc), strerror (err));
+ debug_printf ("Failed to uninsert fast tracepoint jump at"
+ " 0x%s (%s).\n",
+ paddress (pc), strerror (err));
}
}
}
{
struct fast_tracepoint_jump *jp;
int err;
+ unsigned char *buf;
jp = find_fast_tracepoint_jump_at (where);
if (jp == NULL)
/* This can happen when we remove breakpoints when a tracepoint
hit causes a tracing stop, while handling a step-over. */
if (debug_threads)
- fprintf (stderr,
- "Could not find fast tracepoint jump at 0x%s "
- "in list (reinserting).\n",
- paddress (where));
+ debug_printf ("Could not find fast tracepoint jump at 0x%s "
+ "in list (reinserting).\n",
+ paddress (where));
return;
}
to pass the current shadow contents, because
write_inferior_memory updates any shadow memory with what we pass
here, and we want that to be a nop. */
- err = write_inferior_memory (where,
- fast_tracepoint_jump_shadow (jp), jp->length);
+ buf = (unsigned char *) alloca (jp->length);
+ memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length);
+ err = write_inferior_memory (where, buf, jp->length);
if (err != 0)
{
jp->inserted = 0;
if (debug_threads)
- fprintf (stderr,
- "Failed to reinsert fast tracepoint jump at 0x%s (%s).\n",
- paddress (where), strerror (err));
+ debug_printf ("Failed to reinsert fast tracepoint jump at"
+ " 0x%s (%s).\n",
+ paddress (where), strerror (err));
}
}
-struct breakpoint *
-set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
+/* Set a high-level breakpoint of type TYPE, with low level type
+ RAW_TYPE and kind KIND, at WHERE. On success, a pointer to the new
+ breakpoint is returned. On failure, returns NULL and writes the
+ error code to *ERR. HANDLER is called when the breakpoint is hit.
+ HANDLER should return 1 if the breakpoint should be deleted, 0
+ otherwise. */
+
+static struct breakpoint *
+set_breakpoint (enum bkpt_type type, enum raw_bkpt_type raw_type,
+ CORE_ADDR where, int kind,
+ int (*handler) (CORE_ADDR), int *err)
{
struct process_info *proc = current_process ();
struct breakpoint *bp;
struct raw_breakpoint *raw;
- raw = set_raw_breakpoint_at (where);
+ raw = set_raw_breakpoint_at (raw_type, where, kind, err);
if (raw == NULL)
{
return NULL;
}
- bp = xcalloc (1, sizeof (struct breakpoint));
- bp->type = other_breakpoint;
+ bp = XCNEW (struct breakpoint);
+ bp->type = type;
bp->raw = raw;
bp->handler = handler;
return bp;
}
+/* See mem-break.h */
+
+struct breakpoint *
+set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
+{
+ int err_ignored;
+ CORE_ADDR placed_address = where;
+ int breakpoint_kind = target_breakpoint_kind_from_pc (&placed_address);
+
+ return set_breakpoint (other_breakpoint, raw_bkpt_type_sw,
+ placed_address, breakpoint_kind, handler,
+ &err_ignored);
+}
+
+
static int
delete_raw_breakpoint (struct process_info *proc, struct raw_breakpoint *todel)
{
{
if (bp == todel)
{
- if (bp->inserted)
+ if (bp->inserted > 0)
{
struct raw_breakpoint *prev_bp_link = *bp_link;
*bp_link = bp->next;
- /* Since there can be trap breakpoints inserted in the
- same address range, we use `write_inferior_memory',
- which takes care of layering breakpoints on top of
- fast tracepoints, and on top of the buffer we pass
- it. This works because we've already unlinked the
- fast tracepoint jump above. Also note that we need
- to pass the current shadow contents, because
- write_inferior_memory updates any shadow memory with
- what we pass here, and we want that to be a nop. */
- ret = write_inferior_memory (bp->pc, bp->old_data,
- breakpoint_len);
+ ret = the_target->remove_point (bp->raw_type, bp->pc, bp->kind,
+ bp);
if (ret != 0)
{
/* Something went wrong, relink the breakpoint. */
*bp_link = prev_bp_link;
if (debug_threads)
- fprintf (stderr,
- "Failed to uninsert raw breakpoint "
- "at 0x%s (%s) while deleting it.\n",
- paddress (bp->pc), strerror (ret));
+ debug_printf ("Failed to uninsert raw breakpoint "
+ "at 0x%s while deleting it.\n",
+ paddress (bp->pc));
return ret;
}
-
}
else
*bp_link = bp->next;
return delete_breakpoint_1 (proc, todel);
}
+/* Locate a GDB breakpoint of type Z_TYPE and kind KIND placed at
+ address ADDR and return a pointer to its structure. If KIND is -1,
+ the breakpoint's kind is ignored. */
+
static struct breakpoint *
-find_gdb_breakpoint_at (CORE_ADDR where)
+find_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind)
{
struct process_info *proc = current_process ();
struct breakpoint *bp;
+ enum bkpt_type type = Z_packet_to_bkpt_type (z_type);
for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
- if (bp->type == gdb_breakpoint && bp->raw->pc == where)
+ if (bp->type == type && bp->raw->pc == addr
+ && (kind == -1 || bp->raw->kind == kind))
return bp;
return NULL;
}
-int
-set_gdb_breakpoint_at (CORE_ADDR where)
+static int
+z_type_supported (char z_type)
+{
+ return (z_type >= '0' && z_type <= '4'
+ && the_target->supports_z_point_type != NULL
+ && the_target->supports_z_point_type (z_type));
+}
+
+/* Create a new GDB breakpoint of type Z_TYPE at ADDR with kind KIND.
+ Returns a pointer to the newly created breakpoint on success. On
+ failure returns NULL and sets *ERR to either -1 for error, or 1 if
+ Z_TYPE breakpoints are not supported on this target. */
+
+static struct breakpoint *
+set_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind, int *err)
{
struct breakpoint *bp;
+ enum bkpt_type type;
+ enum raw_bkpt_type raw_type;
+
+ /* If we see GDB inserting a second code breakpoint at the same
+ address, then either: GDB is updating the breakpoint's conditions
+ or commands; or, the first breakpoint must have disappeared due
+ to a shared library unload. On targets where the shared
+ libraries are handled by userspace, like SVR4, for example,
+ GDBserver can't tell if a library was loaded or unloaded. Since
+ we refcount raw breakpoints, we must be careful to make sure GDB
+ breakpoints never contribute more than one reference. if we
+ didn't do this, in case the previous breakpoint is gone due to a
+ shared library unload, we'd just increase the refcount of the
+ previous breakpoint at this address, but the trap was not planted
+ in the inferior anymore, thus the breakpoint would never be hit.
+ Note this must be careful to not create a window where
+ breakpoints are removed from the target, for non-stop, in case
+ the target can poke at memory while the program is running. */
+ if (z_type == Z_PACKET_SW_BP
+ || z_type == Z_PACKET_HW_BP)
+ {
+ bp = find_gdb_breakpoint (z_type, addr, -1);
- if (breakpoint_data == NULL)
- return 1;
+ if (bp != NULL)
+ {
+ if (bp->raw->kind != kind)
+ {
+ /* A different kind than previously seen. The previous
+ breakpoint must be gone then. */
+ bp->raw->inserted = -1;
+ delete_breakpoint (bp);
+ bp = NULL;
+ }
+ else if (z_type == Z_PACKET_SW_BP)
+ {
+ /* Check if the breakpoint is actually gone from the
+ target, due to an solib unload, for example. Might
+ as well validate _all_ breakpoints. */
+ validate_breakpoints ();
+
+ /* Breakpoints that don't pass validation are
+ deleted. */
+ bp = find_gdb_breakpoint (z_type, addr, -1);
+ }
+ }
+ }
+ else
+ {
+ /* Data breakpoints for the same address but different kind are
+ expected. GDB doesn't merge these. The backend gets to do
+ that if it wants/can. */
+ bp = find_gdb_breakpoint (z_type, addr, kind);
+ }
- /* If we see GDB inserting a second breakpoint at the same address,
- then the first breakpoint must have disappeared due to a shared
- library unload. On targets where the shared libraries are
- handled by userspace, like SVR4, for example, GDBserver can't
- tell if a library was loaded or unloaded. Since we refcount
- breakpoints, if we didn't do this, we'd just increase the
- refcount of the previous breakpoint at this address, but the trap
- was not planted in the inferior anymore, thus the breakpoint
- would never be hit. */
- bp = find_gdb_breakpoint_at (where);
if (bp != NULL)
{
- delete_gdb_breakpoint_at (where);
+ /* We already know about this breakpoint, there's nothing else
+ to do - GDB's reference is already accounted for. Note that
+ whether the breakpoint inserted is left as is - we may be
+ stepping over it, for example, in which case we don't want to
+ force-reinsert it. */
+ return bp;
+ }
+
+ raw_type = Z_packet_to_raw_bkpt_type (z_type);
+ type = Z_packet_to_bkpt_type (z_type);
+ return set_breakpoint (type, raw_type, addr, kind, NULL, err);
+}
+
+static int
+check_gdb_bp_preconditions (char z_type, int *err)
+{
+ /* As software/memory breakpoints work by poking at memory, we need
+ to prepare to access memory. If that operation fails, we need to
+ return error. Seeing an error, if this is the first breakpoint
+ of that type that GDB tries to insert, GDB would then assume the
+ breakpoint type is supported, but it may actually not be. So we
+ need to check whether the type is supported at all before
+ preparing to access memory. */
+ if (!z_type_supported (z_type))
+ {
+ *err = 1;
+ return 0;
+ }
+
+ return 1;
+}
+
+/* See mem-break.h. This is a wrapper for set_gdb_breakpoint_1 that
+ knows to prepare to access memory for Z0 breakpoints. */
+
+struct breakpoint *
+set_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind, int *err)
+{
+ struct breakpoint *bp;
- /* Might as well validate all other breakpoints. */
- validate_breakpoints ();
+ if (!check_gdb_bp_preconditions (z_type, err))
+ return NULL;
+
+ /* If inserting a software/memory breakpoint, need to prepare to
+ access memory. */
+ if (z_type == Z_PACKET_SW_BP)
+ {
+ if (prepare_to_access_memory () != 0)
+ {
+ *err = -1;
+ return NULL;
+ }
}
- bp = set_breakpoint_at (where, NULL);
+ bp = set_gdb_breakpoint_1 (z_type, addr, kind, err);
+
+ if (z_type == Z_PACKET_SW_BP)
+ done_accessing_memory ();
+
+ return bp;
+}
+
+/* Delete a GDB breakpoint of type Z_TYPE and kind KIND previously
+ inserted at ADDR with set_gdb_breakpoint_at. Returns 0 on success,
+ -1 on error, and 1 if Z_TYPE breakpoints are not supported on this
+ target. */
+
+static int
+delete_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind)
+{
+ struct breakpoint *bp;
+ int err;
+
+ bp = find_gdb_breakpoint (z_type, addr, kind);
if (bp == NULL)
return -1;
- bp->type = gdb_breakpoint;
+ /* Before deleting the breakpoint, make sure to free its condition
+ and command lists. */
+ clear_breakpoint_conditions_and_commands (bp);
+ err = delete_breakpoint (bp);
+ if (err != 0)
+ return -1;
+
return 0;
}
+/* See mem-break.h. This is a wrapper for delete_gdb_breakpoint that
+ knows to prepare to access memory for Z0 breakpoints. */
+
int
-delete_gdb_breakpoint_at (CORE_ADDR addr)
+delete_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind)
{
- struct breakpoint *bp;
- int err;
+ int ret;
+
+ if (!check_gdb_bp_preconditions (z_type, &ret))
+ return ret;
+
+ /* If inserting a software/memory breakpoint, need to prepare to
+ access memory. */
+ if (z_type == Z_PACKET_SW_BP)
+ {
+ int err;
+
+ err = prepare_to_access_memory ();
+ if (err != 0)
+ return -1;
+ }
+
+ ret = delete_gdb_breakpoint_1 (z_type, addr, kind);
+
+ if (z_type == Z_PACKET_SW_BP)
+ done_accessing_memory ();
+
+ return ret;
+}
+
+/* Clear all conditions associated with a breakpoint. */
+
+static void
+clear_breakpoint_conditions (struct breakpoint *bp)
+{
+ struct point_cond_list *cond;
+
+ if (bp->cond_list == NULL)
+ return;
+
+ cond = bp->cond_list;
+
+ while (cond != NULL)
+ {
+ struct point_cond_list *cond_next;
+
+ cond_next = cond->next;
+ gdb_free_agent_expr (cond->cond);
+ free (cond);
+ cond = cond_next;
+ }
+
+ bp->cond_list = NULL;
+}
+
+/* Clear all commands associated with a breakpoint. */
+
+static void
+clear_breakpoint_commands (struct breakpoint *bp)
+{
+ struct point_command_list *cmd;
+
+ if (bp->command_list == NULL)
+ return;
+
+ cmd = bp->command_list;
+
+ while (cmd != NULL)
+ {
+ struct point_command_list *cmd_next;
+
+ cmd_next = cmd->next;
+ gdb_free_agent_expr (cmd->cmd);
+ free (cmd);
+ cmd = cmd_next;
+ }
+
+ bp->command_list = NULL;
+}
+
+void
+clear_breakpoint_conditions_and_commands (struct breakpoint *bp)
+{
+ clear_breakpoint_conditions (bp);
+ clear_breakpoint_commands (bp);
+}
- if (breakpoint_data == NULL)
+/* Add condition CONDITION to GDBserver's breakpoint BP. */
+
+static void
+add_condition_to_breakpoint (struct breakpoint *bp,
+ struct agent_expr *condition)
+{
+ struct point_cond_list *new_cond;
+
+ /* Create new condition. */
+ new_cond = XCNEW (struct point_cond_list);
+ new_cond->cond = condition;
+
+ /* Add condition to the list. */
+ new_cond->next = bp->cond_list;
+ bp->cond_list = new_cond;
+}
+
+/* Add a target-side condition CONDITION to a breakpoint. */
+
+int
+add_breakpoint_condition (struct breakpoint *bp, char **condition)
+{
+ char *actparm = *condition;
+ struct agent_expr *cond;
+
+ if (condition == NULL)
return 1;
- bp = find_gdb_breakpoint_at (addr);
if (bp == NULL)
- return -1;
+ return 0;
+
+ cond = gdb_parse_agent_expr (&actparm);
+
+ if (cond == NULL)
+ {
+ fprintf (stderr, "Condition evaluation failed. "
+ "Assuming unconditional.\n");
+ return 0;
+ }
+
+ add_condition_to_breakpoint (bp, cond);
+
+ *condition = actparm;
+
+ return 1;
+}
+
+/* Evaluate condition (if any) at breakpoint BP. Return 1 if
+ true and 0 otherwise. */
+
+static int
+gdb_condition_true_at_breakpoint_z_type (char z_type, CORE_ADDR addr)
+{
+ /* Fetch registers for the current inferior. */
+ struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1);
+ ULONGEST value = 0;
+ struct point_cond_list *cl;
+ int err = 0;
+ struct eval_agent_expr_context ctx;
+
+ if (bp == NULL)
+ return 0;
+
+ /* Check if the breakpoint is unconditional. If it is,
+ the condition always evaluates to TRUE. */
+ if (bp->cond_list == NULL)
+ return 1;
+
+ ctx.regcache = get_thread_regcache (current_thread, 1);
+ ctx.tframe = NULL;
+ ctx.tpoint = NULL;
+
+ /* Evaluate each condition in the breakpoint's list of conditions.
+ Return true if any of the conditions evaluates to TRUE.
+
+ If we failed to evaluate the expression, TRUE is returned. This
+ forces GDB to reevaluate the conditions. */
+ for (cl = bp->cond_list;
+ cl && !value && !err; cl = cl->next)
+ {
+ /* Evaluate the condition. */
+ err = gdb_eval_agent_expr (&ctx, cl->cond, &value);
+ }
- err = delete_breakpoint (bp);
if (err)
- return -1;
+ return 1;
- return 0;
+ return (value != 0);
}
int
-gdb_breakpoint_here (CORE_ADDR where)
+gdb_condition_true_at_breakpoint (CORE_ADDR where)
+{
+ /* Only check code (software or hardware) breakpoints. */
+ return (gdb_condition_true_at_breakpoint_z_type (Z_PACKET_SW_BP, where)
+ || gdb_condition_true_at_breakpoint_z_type (Z_PACKET_HW_BP, where));
+}
+
+/* Add commands COMMANDS to GDBserver's breakpoint BP. */
+
+static void
+add_commands_to_breakpoint (struct breakpoint *bp,
+ struct agent_expr *commands, int persist)
+{
+ struct point_command_list *new_cmd;
+
+ /* Create new command. */
+ new_cmd = XCNEW (struct point_command_list);
+ new_cmd->cmd = commands;
+ new_cmd->persistence = persist;
+
+ /* Add commands to the list. */
+ new_cmd->next = bp->command_list;
+ bp->command_list = new_cmd;
+}
+
+/* Add a target-side command COMMAND to the breakpoint at ADDR. */
+
+int
+add_breakpoint_commands (struct breakpoint *bp, char **command,
+ int persist)
+{
+ char *actparm = *command;
+ struct agent_expr *cmd;
+
+ if (command == NULL)
+ return 1;
+
+ if (bp == NULL)
+ return 0;
+
+ cmd = gdb_parse_agent_expr (&actparm);
+
+ if (cmd == NULL)
+ {
+ fprintf (stderr, "Command evaluation failed. "
+ "Disabling.\n");
+ return 0;
+ }
+
+ add_commands_to_breakpoint (bp, cmd, persist);
+
+ *command = actparm;
+
+ return 1;
+}
+
+/* Return true if there are no commands to run at this location,
+ which likely means we want to report back to GDB. */
+
+static int
+gdb_no_commands_at_breakpoint_z_type (char z_type, CORE_ADDR addr)
+{
+ struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1);
+
+ if (bp == NULL)
+ return 1;
+
+ if (debug_threads)
+ debug_printf ("at 0x%s, type Z%c, bp command_list is 0x%s\n",
+ paddress (addr), z_type,
+ phex_nz ((uintptr_t) bp->command_list, 0));
+ return (bp->command_list == NULL);
+}
+
+/* Return true if there are no commands to run at this location,
+ which likely means we want to report back to GDB. */
+
+int
+gdb_no_commands_at_breakpoint (CORE_ADDR where)
+{
+ /* Only check code (software or hardware) breakpoints. */
+ return (gdb_no_commands_at_breakpoint_z_type (Z_PACKET_SW_BP, where)
+ && gdb_no_commands_at_breakpoint_z_type (Z_PACKET_HW_BP, where));
+}
+
+/* Run a breakpoint's commands. Returns 0 if there was a problem
+ running any command, 1 otherwise. */
+
+static int
+run_breakpoint_commands_z_type (char z_type, CORE_ADDR addr)
+{
+ /* Fetch registers for the current inferior. */
+ struct breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1);
+ ULONGEST value = 0;
+ struct point_command_list *cl;
+ int err = 0;
+ struct eval_agent_expr_context ctx;
+
+ if (bp == NULL)
+ return 1;
+
+ ctx.regcache = get_thread_regcache (current_thread, 1);
+ ctx.tframe = NULL;
+ ctx.tpoint = NULL;
+
+ for (cl = bp->command_list;
+ cl && !value && !err; cl = cl->next)
+ {
+ /* Run the command. */
+ err = gdb_eval_agent_expr (&ctx, cl->cmd, &value);
+
+ /* If one command has a problem, stop digging the hole deeper. */
+ if (err)
+ return 0;
+ }
+
+ return 1;
+}
+
+void
+run_breakpoint_commands (CORE_ADDR where)
{
- struct breakpoint *bp = find_gdb_breakpoint_at (where);
+ /* Only check code (software or hardware) breakpoints. If one
+ command has a problem, stop digging the hole deeper. */
+ if (run_breakpoint_commands_z_type (Z_PACKET_SW_BP, where))
+ run_breakpoint_commands_z_type (Z_PACKET_HW_BP, where);
+}
- return (bp != NULL);
+/* See mem-break.h. */
+
+int
+gdb_breakpoint_here (CORE_ADDR where)
+{
+ /* Only check code (software or hardware) breakpoints. */
+ return (find_gdb_breakpoint (Z_PACKET_SW_BP, where, -1) != NULL
+ || find_gdb_breakpoint (Z_PACKET_HW_BP, where, -1) != NULL);
}
void
static void
uninsert_raw_breakpoint (struct raw_breakpoint *bp)
{
- if (bp->inserted)
+ if (bp->inserted < 0)
+ {
+ if (debug_threads)
+ debug_printf ("Breakpoint at %s is marked insert-disabled.\n",
+ paddress (bp->pc));
+ }
+ else if (bp->inserted > 0)
{
int err;
bp->inserted = 0;
- /* Since there can be fast tracepoint jumps inserted in the same
- address range, we use `write_inferior_memory', which takes
- care of layering breakpoints on top of fast tracepoints, and
- on top of the buffer we pass it. This works because we've
- already unlinked the fast tracepoint jump above. Also note
- that we need to pass the current shadow contents, because
- write_inferior_memory updates any shadow memory with what we
- pass here, and we want that to be a nop. */
- err = write_inferior_memory (bp->pc, bp->old_data,
- breakpoint_len);
+
+ err = the_target->remove_point (bp->raw_type, bp->pc, bp->kind, bp);
if (err != 0)
{
bp->inserted = 1;
if (debug_threads)
- fprintf (stderr,
- "Failed to uninsert raw breakpoint at 0x%s (%s).\n",
- paddress (bp->pc), strerror (err));
+ debug_printf ("Failed to uninsert raw breakpoint at 0x%s.\n",
+ paddress (bp->pc));
}
}
}
void
uninsert_breakpoints_at (CORE_ADDR pc)
{
+ struct process_info *proc = current_process ();
struct raw_breakpoint *bp;
+ int found = 0;
- bp = find_raw_breakpoint_at (pc);
- if (bp == NULL)
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && bp->pc == pc)
+ {
+ found = 1;
+
+ if (bp->inserted)
+ uninsert_raw_breakpoint (bp);
+ }
+
+ if (!found)
{
/* This can happen when we remove all breakpoints while handling
a step-over. */
if (debug_threads)
- fprintf (stderr,
- "Could not find breakpoint at 0x%s "
- "in list (uninserting).\n",
- paddress (pc));
- return;
+ debug_printf ("Could not find breakpoint at 0x%s "
+ "in list (uninserting).\n",
+ paddress (pc));
}
-
- if (bp->inserted)
- uninsert_raw_breakpoint (bp);
}
void
struct raw_breakpoint *bp;
for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
- if (bp->inserted)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && bp->inserted)
uninsert_raw_breakpoint (bp);
}
+void
+uninsert_reinsert_breakpoints (void)
+{
+ struct process_info *proc = current_process ();
+ struct breakpoint *bp;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ if (bp->type == reinsert_breakpoint)
+ {
+ gdb_assert (bp->raw->inserted > 0);
+
+ /* Only uninsert the raw breakpoint if it only belongs to a
+ reinsert breakpoint. */
+ if (bp->raw->refcount == 1)
+ uninsert_raw_breakpoint (bp->raw);
+ }
+ }
+}
+
static void
reinsert_raw_breakpoint (struct raw_breakpoint *bp)
{
int err;
if (bp->inserted)
- error ("Breakpoint already inserted at reinsert time.");
+ return;
- err = (*the_target->write_memory) (bp->pc, breakpoint_data,
- breakpoint_len);
+ err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp);
if (err == 0)
bp->inserted = 1;
else if (debug_threads)
- fprintf (stderr,
- "Failed to reinsert breakpoint at 0x%s (%s).\n",
- paddress (bp->pc), strerror (err));
+ debug_printf ("Failed to reinsert breakpoint at 0x%s (%d).\n",
+ paddress (bp->pc), err);
}
void
reinsert_breakpoints_at (CORE_ADDR pc)
{
+ struct process_info *proc = current_process ();
struct raw_breakpoint *bp;
+ int found = 0;
- bp = find_raw_breakpoint_at (pc);
- if (bp == NULL)
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && bp->pc == pc)
+ {
+ found = 1;
+
+ reinsert_raw_breakpoint (bp);
+ }
+
+ if (!found)
{
/* This can happen when we remove all breakpoints while handling
a step-over. */
if (debug_threads)
- fprintf (stderr,
- "Could not find raw breakpoint at 0x%s "
- "in list (reinserting).\n",
- paddress (pc));
- return;
+ debug_printf ("Could not find raw breakpoint at 0x%s "
+ "in list (reinserting).\n",
+ paddress (pc));
}
+}
+
+int
+has_reinsert_breakpoints (struct process_info *proc)
+{
+ struct breakpoint *bp, **bp_link;
- reinsert_raw_breakpoint (bp);
+ bp = proc->breakpoints;
+ bp_link = &proc->breakpoints;
+
+ while (bp)
+ {
+ if (bp->type == reinsert_breakpoint)
+ return 1;
+ else
+ {
+ bp_link = &bp->next;
+ bp = *bp_link;
+ }
+ }
+
+ return 0;
}
void
struct raw_breakpoint *bp;
for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
- if (!bp->inserted)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && !bp->inserted)
reinsert_raw_breakpoint (bp);
}
+void
+reinsert_reinsert_breakpoints (void)
+{
+ struct process_info *proc = current_process ();
+ struct breakpoint *bp;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ if (bp->type == reinsert_breakpoint)
+ {
+ gdb_assert (bp->raw->inserted > 0);
+
+ if (bp->raw->refcount == 1)
+ reinsert_raw_breakpoint (bp->raw);
+ }
+ }
+}
+
void
check_breakpoints (CORE_ADDR stop_pc)
{
while (bp)
{
- if (bp->raw->pc == stop_pc)
+ struct raw_breakpoint *raw = bp->raw;
+
+ if ((raw->raw_type == raw_bkpt_type_sw
+ || raw->raw_type == raw_bkpt_type_hw)
+ && raw->pc == stop_pc)
{
- if (!bp->raw->inserted)
+ if (!raw->inserted)
{
warning ("Hit a removed breakpoint?");
return;
}
}
-void
-set_breakpoint_data (const unsigned char *bp_data, int bp_len)
+int
+breakpoint_here (CORE_ADDR addr)
{
- breakpoint_data = bp_data;
- breakpoint_len = bp_len;
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && bp->pc == addr)
+ return 1;
+
+ return 0;
}
int
-breakpoint_here (CORE_ADDR addr)
+breakpoint_inserted_here (CORE_ADDR addr)
+{
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if ((bp->raw_type == raw_bkpt_type_sw
+ || bp->raw_type == raw_bkpt_type_hw)
+ && bp->pc == addr
+ && bp->inserted)
+ return 1;
+
+ return 0;
+}
+
+/* See mem-break.h. */
+
+int
+software_breakpoint_inserted_here (CORE_ADDR addr)
{
- return (find_raw_breakpoint_at (addr) != NULL);
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if (bp->raw_type == raw_bkpt_type_sw
+ && bp->pc == addr
+ && bp->inserted)
+ return 1;
+
+ return 0;
}
+/* See mem-break.h. */
+
int
-breakpoint_inserted_here (CORE_ADDR addr)
+hardware_breakpoint_inserted_here (CORE_ADDR addr)
{
+ struct process_info *proc = current_process ();
struct raw_breakpoint *bp;
- bp = find_raw_breakpoint_at (addr);
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if (bp->raw_type == raw_bkpt_type_hw
+ && bp->pc == addr
+ && bp->inserted)
+ return 1;
- return (bp != NULL && bp->inserted);
+ return 0;
+}
+
+/* See mem-break.h. */
+
+int
+reinsert_breakpoint_inserted_here (CORE_ADDR addr)
+{
+ struct process_info *proc = current_process ();
+ struct breakpoint *bp;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ if (bp->type == reinsert_breakpoint
+ && bp->raw->pc == addr
+ && bp->raw->inserted)
+ return 1;
+
+ return 0;
}
static int
int err;
gdb_assert (bp->inserted);
+ gdb_assert (bp->raw_type == raw_bkpt_type_sw);
- buf = alloca (breakpoint_len);
- err = (*the_target->read_memory) (bp->pc, buf, breakpoint_len);
- if (err || memcmp (buf, breakpoint_data, breakpoint_len) != 0)
+ buf = (unsigned char *) alloca (bp_size (bp));
+ err = (*the_target->read_memory) (bp->pc, buf, bp_size (bp));
+ if (err || memcmp (buf, bp_opcode (bp), bp_size (bp)) != 0)
{
/* Tag it as gone. */
- bp->inserted = 0;
- bp->shlib_disabled = 1;
+ bp->inserted = -1;
return 0;
}
for (bp = proc->breakpoints; bp != NULL; bp = next)
{
next = bp->next;
- if (bp->raw->shlib_disabled)
- delete_breakpoint_1 (proc, bp);
+ if (bp->raw->inserted < 0)
+ {
+ /* If reinsert_breakpoints become disabled, that means the
+ manipulations (insertion and removal) of them are wrong. */
+ gdb_assert (bp->type != reinsert_breakpoint);
+ delete_breakpoint_1 (proc, bp);
+ }
}
}
for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
{
- if (bp->raw->inserted)
- validate_inserted_breakpoint (bp->raw);
+ struct raw_breakpoint *raw = bp->raw;
+
+ if (raw->raw_type == raw_bkpt_type_sw && raw->inserted > 0)
+ validate_inserted_breakpoint (raw);
}
delete_disabled_breakpoints ();
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
+ gdb_assert (fast_tracepoint_jump_shadow (jp) >= buf + mem_len
+ || buf >= fast_tracepoint_jump_shadow (jp) + (jp)->length);
+
if (mem_addr >= bp_end)
continue;
if (jp->pc >= mem_end)
for (; bp != NULL; bp = bp->next)
{
- CORE_ADDR bp_end = bp->pc + breakpoint_len;
+ CORE_ADDR bp_end = bp->pc + bp_size (bp);
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
+ if (bp->raw_type != raw_bkpt_type_sw)
+ continue;
+
+ gdb_assert (bp->old_data >= buf + mem_len
+ || buf >= &bp->old_data[sizeof (bp->old_data)]);
+
if (mem_addr >= bp_end)
continue;
if (bp->pc >= mem_end)
copy_offset = start - bp->pc;
buf_offset = start - mem_addr;
- if (bp->inserted)
+ if (bp->inserted > 0)
{
if (validate_inserted_breakpoint (bp))
memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len);
}
void
-check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
+check_mem_write (CORE_ADDR mem_addr, unsigned char *buf,
+ const unsigned char *myaddr, int mem_len)
{
struct process_info *proc = current_process ();
struct raw_breakpoint *bp = proc->raw_breakpoints;
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
+ gdb_assert (fast_tracepoint_jump_shadow (jp) >= myaddr + mem_len
+ || myaddr >= fast_tracepoint_jump_shadow (jp) + (jp)->length);
+ gdb_assert (fast_tracepoint_jump_insn (jp) >= buf + mem_len
+ || buf >= fast_tracepoint_jump_insn (jp) + (jp)->length);
+
if (mem_addr >= jp_end)
continue;
if (jp->pc >= mem_end)
buf_offset = start - mem_addr;
memcpy (fast_tracepoint_jump_shadow (jp) + copy_offset,
- buf + buf_offset, copy_len);
+ myaddr + buf_offset, copy_len);
if (jp->inserted)
memcpy (buf + buf_offset,
fast_tracepoint_jump_insn (jp) + copy_offset, copy_len);
for (; bp != NULL; bp = bp->next)
{
- CORE_ADDR bp_end = bp->pc + breakpoint_len;
+ CORE_ADDR bp_end = bp->pc + bp_size (bp);
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
+ if (bp->raw_type != raw_bkpt_type_sw)
+ continue;
+
+ gdb_assert (bp->old_data >= myaddr + mem_len
+ || myaddr >= &bp->old_data[sizeof (bp->old_data)]);
+
if (mem_addr >= bp_end)
continue;
if (bp->pc >= mem_end)
copy_offset = start - bp->pc;
buf_offset = start - mem_addr;
- memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);
- if (bp->inserted)
+ memcpy (bp->old_data + copy_offset, myaddr + buf_offset, copy_len);
+ if (bp->inserted > 0)
{
if (validate_inserted_breakpoint (bp))
- memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);
+ memcpy (buf + buf_offset, bp_opcode (bp) + copy_offset, copy_len);
else
disabled_one = 1;
}
while (proc->breakpoints)
delete_breakpoint_1 (proc, proc->breakpoints);
}
+
+/* Clone an agent expression. */
+
+static struct agent_expr *
+clone_agent_expr (const struct agent_expr *src_ax)
+{
+ struct agent_expr *ax;
+
+ ax = XCNEW (struct agent_expr);
+ ax->length = src_ax->length;
+ ax->bytes = (unsigned char *) xcalloc (ax->length, 1);
+ memcpy (ax->bytes, src_ax->bytes, ax->length);
+ return ax;
+}
+
+/* Deep-copy the contents of one breakpoint to another. */
+
+static struct breakpoint *
+clone_one_breakpoint (const struct breakpoint *src)
+{
+ struct breakpoint *dest;
+ struct raw_breakpoint *dest_raw;
+ struct point_cond_list *current_cond;
+ struct point_cond_list *new_cond;
+ struct point_cond_list *cond_tail = NULL;
+ struct point_command_list *current_cmd;
+ struct point_command_list *new_cmd;
+ struct point_command_list *cmd_tail = NULL;
+
+ /* Clone the raw breakpoint. */
+ dest_raw = XCNEW (struct raw_breakpoint);
+ dest_raw->raw_type = src->raw->raw_type;
+ dest_raw->refcount = src->raw->refcount;
+ dest_raw->pc = src->raw->pc;
+ dest_raw->kind = src->raw->kind;
+ memcpy (dest_raw->old_data, src->raw->old_data, MAX_BREAKPOINT_LEN);
+ dest_raw->inserted = src->raw->inserted;
+
+ /* Clone the high-level breakpoint. */
+ dest = XCNEW (struct breakpoint);
+ dest->type = src->type;
+ dest->raw = dest_raw;
+ dest->handler = src->handler;
+
+ /* Clone the condition list. */
+ for (current_cond = src->cond_list; current_cond != NULL;
+ current_cond = current_cond->next)
+ {
+ new_cond = XCNEW (struct point_cond_list);
+ new_cond->cond = clone_agent_expr (current_cond->cond);
+ APPEND_TO_LIST (&dest->cond_list, new_cond, cond_tail);
+ }
+
+ /* Clone the command list. */
+ for (current_cmd = src->command_list; current_cmd != NULL;
+ current_cmd = current_cmd->next)
+ {
+ new_cmd = XCNEW (struct point_command_list);
+ new_cmd->cmd = clone_agent_expr (current_cmd->cmd);
+ new_cmd->persistence = current_cmd->persistence;
+ APPEND_TO_LIST (&dest->command_list, new_cmd, cmd_tail);
+ }
+
+ return dest;
+}
+
+/* Create a new breakpoint list NEW_LIST that is a copy of the
+ list starting at SRC_LIST. Create the corresponding new
+ raw_breakpoint list NEW_RAW_LIST as well. */
+
+void
+clone_all_breakpoints (struct breakpoint **new_list,
+ struct raw_breakpoint **new_raw_list,
+ const struct breakpoint *src_list)
+{
+ const struct breakpoint *bp;
+ struct breakpoint *new_bkpt;
+ struct breakpoint *bkpt_tail = NULL;
+ struct raw_breakpoint *raw_bkpt_tail = NULL;
+
+ for (bp = src_list; bp != NULL; bp = bp->next)
+ {
+ new_bkpt = clone_one_breakpoint (bp);
+ APPEND_TO_LIST (new_list, new_bkpt, bkpt_tail);
+ APPEND_TO_LIST (new_raw_list, new_bkpt->raw, raw_bkpt_tail);
+ }
+}
projects / deliverable / binutils-gdb.git / blobdiff