/* Memory breakpoint operations for the remote server for GDB.
- Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010
- Free Software Foundation, Inc.
+ Copyright (C) 2002-2019 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 basic-software-single-step breakpoint. */
- reinsert_breakpoint,
+ /* A GDB access watchpoint, requested with a Z4 packet. */
+ gdb_breakpoint_Z4,
+
+ /* A software single-step breakpoint. */
+ single_step_breakpoint,
/* Any other breakpoint type that doesn't require specific
treatment goes here. E.g., an event 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
{
/* Link to this breakpoint's raw breakpoint. This is always
non-NULL. */
struct raw_breakpoint *raw;
+};
+
+/* Breakpoint requested by GDB. */
+
+struct gdb_breakpoint
+{
+ struct breakpoint base;
+
+ /* 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;
+};
+
+/* Breakpoint used by GDBserver. */
+
+struct other_breakpoint
+{
+ struct breakpoint base;
/* Function to call when we hit this breakpoint. If it returns 1,
the breakpoint shall be deleted; 0 or if this callback is NULL,
int (*handler) (CORE_ADDR);
};
+/* Breakpoint for single step. */
+
+struct single_step_breakpoint
+{
+ struct breakpoint base;
+
+ /* Thread the reinsert breakpoint belongs to. */
+ ptid_t ptid;
+};
+
+/* 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.");
+ }
+}
+
+/* Return true if breakpoint TYPE is a GDB breakpoint. */
+
+static int
+is_gdb_breakpoint (enum bkpt_type type)
+{
+ return (type == gdb_breakpoint_Z0
+ || type == gdb_breakpoint_Z1
+ || type == gdb_breakpoint_Z2
+ || type == gdb_breakpoint_Z3
+ || type == gdb_breakpoint_Z4);
+}
+
+bool
+any_persistent_commands (process_info *proc)
+{
+ struct breakpoint *bp;
+ struct point_command_list *cl;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ if (is_gdb_breakpoint (bp->type))
+ {
+ struct gdb_breakpoint *gdb_bp = (struct gdb_breakpoint *) bp;
+
+ for (cl = gdb_bp->command_list; cl != NULL; cl = cl->next)
+ if (cl->persistence)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/* 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) (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 */
- err = (*the_target->write_memory) (where, breakpoint_data,
- breakpoint_len);
+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 `target_write_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
+ target_write_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 = target_write_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;
+
+ 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);
+
+ gdb::unique_xmalloc_ptr<struct raw_breakpoint> bp_holder;
+ if (bp == NULL)
+ {
+ bp_holder.reset (XCNEW (struct raw_breakpoint));
+ bp = bp_holder.get ();
+ bp->pc = where;
+ bp->kind = kind;
+ bp->raw_type = type;
+ }
+
+ 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);
+
+ return NULL;
+ }
+
+ bp->inserted = 1;
}
- /* Link the breakpoint in. */
- bp->inserted = 1;
- bp->next = proc->raw_breakpoints;
- proc->raw_breakpoints = bp;
+ /* If the breakpoint was allocated above, we know we want to keep it
+ now. */
+ bp_holder.release ();
+
+ /* 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;
/* Since there can be breakpoints inserted in the same
- address range, we use `write_inferior_memory', which
+ address range, we use `target_write_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
+ target_write_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 = target_write_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;
proc->fast_tracepoint_jumps = jp;
/* Since there can be trap breakpoints inserted in the same address
- range, we use use `write_inferior_memory', which takes care of
+ range, we use use `target_write_memory', which takes care of
layering breakpoints on top of fast tracepoints, on top of the
buffer we pass it. This works because we've already linked in
the fast tracepoint jump above. Also note that we need to pass
- the current shadow contents, because write_inferior_memory
+ the current shadow contents, because target_write_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 = target_write_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
- address range, we use use `write_inferior_memory', which
+ address range, we use use `target_write_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 marked the fast tracepoint fast
tracepoint jump uninserted above. Also note that we need to
pass the current shadow contents, because
- write_inferior_memory updates any shadow memory with what we
+ target_write_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 = target_write_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;
}
jp->inserted = 1;
/* Since there can be trap breakpoints inserted in the same address
- range, we use `write_inferior_memory', which takes care of
+ range, we use `target_write_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 marked
the fast tracepoint jump inserted above. Also note that we need
to pass the current shadow contents, because
- write_inferior_memory updates any shadow memory with what we pass
+ target_write_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 = target_write_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;
+ if (is_gdb_breakpoint (type))
+ {
+ struct gdb_breakpoint *gdb_bp = XCNEW (struct gdb_breakpoint);
+
+ bp = (struct breakpoint *) gdb_bp;
+ gdb_assert (handler == NULL);
+ }
+ else if (type == other_breakpoint)
+ {
+ struct other_breakpoint *other_bp = XCNEW (struct other_breakpoint);
+
+ other_bp->handler = handler;
+ bp = (struct breakpoint *) other_bp;
+ }
+ else if (type == single_step_breakpoint)
+ {
+ struct single_step_breakpoint *ss_bp
+ = XCNEW (struct single_step_breakpoint);
+
+ bp = (struct breakpoint *) ss_bp;
+ }
+ else
+ gdb_assert_not_reached ("unhandled breakpoint type");
+ bp->type = type;
bp->raw = raw;
- bp->handler = handler;
bp->next = proc->breakpoints;
proc->breakpoints = bp;
return bp;
}
+/* Set breakpoint of TYPE on address WHERE with handler HANDLER. */
+
+static struct breakpoint *
+set_breakpoint_type_at (enum bkpt_type type, 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 (type, raw_bkpt_type_sw,
+ placed_address, breakpoint_kind, handler,
+ &err_ignored);
+}
+
+/* See mem-break.h */
+
+struct breakpoint *
+set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
+{
+ return set_breakpoint_type_at (other_breakpoint, where, handler);
+}
+
+
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);
}
-static struct breakpoint *
-find_gdb_breakpoint_at (CORE_ADDR where)
+/* 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 gdb_breakpoint *
+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)
- return bp;
+ if (bp->type == type && bp->raw->pc == addr
+ && (kind == -1 || bp->raw->kind == kind))
+ return (struct gdb_breakpoint *) bp;
return NULL;
}
-int
-set_gdb_breakpoint_at (CORE_ADDR where)
+static int
+z_type_supported (char z_type)
{
- struct breakpoint *bp;
+ return (z_type >= '0' && z_type <= '4'
+ && the_target->supports_z_point_type != NULL
+ && the_target->supports_z_point_type (z_type));
+}
- if (breakpoint_data == NULL)
- return 1;
+/* 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 gdb_breakpoint *
+set_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind, int *err)
+{
+ struct gdb_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 (bp != NULL)
+ {
+ if (bp->base.raw->kind != kind)
+ {
+ /* A different kind than previously seen. The previous
+ breakpoint must be gone then. */
+ bp->base.raw->inserted = -1;
+ delete_breakpoint ((struct 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 (struct gdb_breakpoint *) 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 gdb_breakpoint *
+set_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind, int *err)
+{
+ struct gdb_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);
- if (bp == NULL)
- return -1;
+ bp = set_gdb_breakpoint_1 (z_type, addr, kind, err);
- bp->type = gdb_breakpoint;
- return 0;
+ if (z_type == Z_PACKET_SW_BP)
+ done_accessing_memory ();
+
+ return bp;
}
-int
-delete_gdb_breakpoint_at (CORE_ADDR addr)
+/* 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;
+ struct gdb_breakpoint *bp;
int err;
- if (breakpoint_data == NULL)
- return 1;
-
- bp = find_gdb_breakpoint_at (addr);
+ bp = find_gdb_breakpoint (z_type, addr, kind);
if (bp == NULL)
return -1;
- err = delete_breakpoint (bp);
- if (err)
+ /* Before deleting the breakpoint, make sure to free its condition
+ and command lists. */
+ clear_breakpoint_conditions_and_commands (bp);
+ err = delete_breakpoint ((struct 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
-gdb_breakpoint_here (CORE_ADDR where)
+delete_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind)
{
- struct breakpoint *bp = find_gdb_breakpoint_at (where);
+ int ret;
- return (bp != NULL);
-}
+ if (!check_gdb_bp_preconditions (z_type, &ret))
+ return ret;
-void
-set_reinsert_breakpoint (CORE_ADDR stop_at)
-{
- struct breakpoint *bp;
+ /* 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);
- bp = set_breakpoint_at (stop_at, NULL);
- bp->type = reinsert_breakpoint;
+ if (z_type == Z_PACKET_SW_BP)
+ done_accessing_memory ();
+
+ return ret;
}
-void
-delete_reinsert_breakpoints (void)
+/* Clear all conditions associated with a breakpoint. */
+
+static void
+clear_breakpoint_conditions (struct gdb_breakpoint *bp)
{
- struct process_info *proc = current_process ();
- struct breakpoint *bp, **bp_link;
+ struct point_cond_list *cond;
- bp = proc->breakpoints;
- bp_link = &proc->breakpoints;
+ if (bp->cond_list == NULL)
+ return;
- while (bp)
+ cond = bp->cond_list;
+
+ while (cond != NULL)
{
- if (bp->type == reinsert_breakpoint)
+ 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 gdb_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 gdb_breakpoint *bp)
+{
+ clear_breakpoint_conditions (bp);
+ clear_breakpoint_commands (bp);
+}
+
+/* Add condition CONDITION to GDBserver's breakpoint BP. */
+
+static void
+add_condition_to_breakpoint (struct gdb_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 gdb_breakpoint *bp, const char **condition)
+{
+ const char *actparm = *condition;
+ struct agent_expr *cond;
+
+ if (condition == NULL)
+ return 1;
+
+ if (bp == NULL)
+ return 0;
+
+ cond = gdb_parse_agent_expr (&actparm);
+
+ if (cond == NULL)
+ {
+ warning ("Condition evaluation failed. Assuming unconditional.");
+ 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 gdb_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);
+ }
+
+ if (err)
+ return 1;
+
+ return (value != 0);
+}
+
+int
+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 gdb_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 gdb_breakpoint *bp, const char **command,
+ int persist)
+{
+ const 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)
+ {
+ warning ("Command evaluation failed. Disabling.");
+ 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 gdb_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 gdb_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)
+{
+ /* 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);
+}
+
+/* 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
+set_single_step_breakpoint (CORE_ADDR stop_at, ptid_t ptid)
+{
+ struct single_step_breakpoint *bp;
+
+ gdb_assert (current_ptid.pid () == ptid.pid ());
+
+ bp = (struct single_step_breakpoint *) set_breakpoint_type_at (single_step_breakpoint,
+ stop_at, NULL);
+ bp->ptid = ptid;
+}
+
+void
+delete_single_step_breakpoints (struct thread_info *thread)
+{
+ struct process_info *proc = get_thread_process (thread);
+ struct breakpoint *bp, **bp_link;
+
+ bp = proc->breakpoints;
+ bp_link = &proc->breakpoints;
+
+ while (bp)
+ {
+ if (bp->type == single_step_breakpoint
+ && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread))
{
+ struct thread_info *saved_thread = current_thread;
+
+ current_thread = thread;
*bp_link = bp->next;
release_breakpoint (proc, bp);
bp = *bp_link;
+ current_thread = saved_thread;
}
else
{
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
+uninsert_all_breakpoints (void)
+{
+ 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->inserted)
+ uninsert_raw_breakpoint (bp);
+}
+
+void
+uninsert_single_step_breakpoints (struct thread_info *thread)
+{
+ struct process_info *proc = get_thread_process (thread);
+ struct breakpoint *bp;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ if (bp->type == single_step_breakpoint
+ && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread))
+ {
+ gdb_assert (bp->raw->inserted > 0);
+
+ /* Only uninsert the raw breakpoint if it only belongs to a
+ reinsert breakpoint. */
+ if (bp->raw->refcount == 1)
+ {
+ struct thread_info *saved_thread = current_thread;
+
+ current_thread = thread;
+ uninsert_raw_breakpoint (bp->raw);
+ current_thread = saved_thread;
+ }
+ }
+ }
}
static void
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_single_step_breakpoints (struct thread_info *thread)
+{
+ struct process_info *proc = get_thread_process (thread);
+ struct breakpoint *bp, **bp_link;
+
+ bp = proc->breakpoints;
+ bp_link = &proc->breakpoints;
+
+ while (bp)
+ {
+ if (bp->type == single_step_breakpoint
+ && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread))
+ return 1;
+ else
+ {
+ bp_link = &bp->next;
+ bp = *bp_link;
+ }
}
- reinsert_raw_breakpoint (bp);
+ return 0;
+}
+
+void
+reinsert_all_breakpoints (void)
+{
+ 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->inserted)
+ reinsert_raw_breakpoint (bp);
+}
+
+void
+reinsert_single_step_breakpoints (struct thread_info *thread)
+{
+ struct process_info *proc = get_thread_process (thread);
+ struct breakpoint *bp;
+
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ if (bp->type == single_step_breakpoint
+ && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread))
+ {
+ gdb_assert (bp->raw->inserted > 0);
+
+ if (bp->raw->refcount == 1)
+ {
+ struct thread_info *saved_thread = current_thread;
+
+ current_thread = thread;
+ reinsert_raw_breakpoint (bp->raw);
+ current_thread = saved_thread;
+ }
+ }
+ }
}
void
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;
}
- if (bp->handler != NULL && (*bp->handler) (stop_pc))
+ if (bp->type == other_breakpoint)
{
- *bp_link = bp->next;
+ struct other_breakpoint *other_bp
+ = (struct other_breakpoint *) bp;
+
+ if (other_bp->handler != NULL && (*other_bp->handler) (stop_pc))
+ {
+ *bp_link = bp->next;
- release_breakpoint (proc, bp);
+ release_breakpoint (proc, bp);
- bp = *bp_link;
- continue;
+ bp = *bp_link;
+ continue;
+ }
}
}
}
}
-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)
{
- 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->raw_type == raw_bkpt_type_hw)
+ && bp->pc == addr
+ && bp->inserted)
+ return 1;
+
+ return 0;
}
+/* See mem-break.h. */
+
int
-breakpoint_inserted_here (CORE_ADDR addr)
+software_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->pc == addr
+ && bp->inserted)
+ return 1;
+
+ return 0;
+}
+
+/* See mem-break.h. */
+
+int
+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 0;
+}
+
+/* See mem-break.h. */
+
+int
+single_step_breakpoint_inserted_here (CORE_ADDR addr)
+{
+ struct process_info *proc = current_process ();
+ struct breakpoint *bp;
- return (bp != NULL && bp->inserted);
+ for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
+ if (bp->type == single_step_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 single_step_breakpoints become disabled, that means the
+ manipulations (insertion and removal) of them are wrong. */
+ gdb_assert (bp->type != single_step_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, ptid_t ptid)
+{
+ struct breakpoint *dest;
+ struct raw_breakpoint *dest_raw;
+
+ /* 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. */
+ if (is_gdb_breakpoint (src->type))
+ {
+ struct gdb_breakpoint *gdb_dest = XCNEW (struct gdb_breakpoint);
+ 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 condition list. */
+ for (current_cond = ((struct gdb_breakpoint *) 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 (&gdb_dest->cond_list, new_cond, cond_tail);
+ }
+
+ /* Clone the command list. */
+ for (current_cmd = ((struct gdb_breakpoint *) 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 (&gdb_dest->command_list, new_cmd, cmd_tail);
+ }
+
+ dest = (struct breakpoint *) gdb_dest;
+ }
+ else if (src->type == other_breakpoint)
+ {
+ struct other_breakpoint *other_dest = XCNEW (struct other_breakpoint);
+
+ other_dest->handler = ((struct other_breakpoint *) src)->handler;
+ dest = (struct breakpoint *) other_dest;
+ }
+ else if (src->type == single_step_breakpoint)
+ {
+ struct single_step_breakpoint *ss_dest
+ = XCNEW (struct single_step_breakpoint);
+
+ dest = (struct breakpoint *) ss_dest;
+ /* Since single-step breakpoint is thread specific, don't copy
+ thread id from SRC, use ID instead. */
+ ss_dest->ptid = ptid;
+ }
+ else
+ gdb_assert_not_reached ("unhandled breakpoint type");
+
+ dest->type = src->type;
+ dest->raw = dest_raw;
+
+ return dest;
+}
+
+/* See mem-break.h. */
+
+void
+clone_all_breakpoints (struct thread_info *child_thread,
+ const struct thread_info *parent_thread)
+{
+ const struct breakpoint *bp;
+ struct breakpoint *new_bkpt;
+ struct breakpoint *bkpt_tail = NULL;
+ struct raw_breakpoint *raw_bkpt_tail = NULL;
+ struct process_info *child_proc = get_thread_process (child_thread);
+ struct process_info *parent_proc = get_thread_process (parent_thread);
+ struct breakpoint **new_list = &child_proc->breakpoints;
+ struct raw_breakpoint **new_raw_list = &child_proc->raw_breakpoints;
+
+ for (bp = parent_proc->breakpoints; bp != NULL; bp = bp->next)
+ {
+ new_bkpt = clone_one_breakpoint (bp, ptid_of (child_thread));
+ APPEND_TO_LIST (new_list, new_bkpt, bkpt_tail);
+ APPEND_TO_LIST (new_raw_list, new_bkpt->raw, raw_bkpt_tail);
+ }
+}
projects / thirdparty / binutils-gdb.git / blobdiff