Re: [PATCH 1/2,v3] [AArch64] Recognize more program breakpoint patterns

[Alan Hayward <Alan.Hayward@arm.com>]

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I’m happy with this from AArch64 side.

Alan.

> On 15 Jan 2020, at 11:51, Luis Machado <luis.machado@linaro.org> wrote:
> 
> New in v3:
> 
> - Code cleanups based on reviews.
> 
> New in v2:
> 
> - Fixed misc problems based on reviews.
> - Switched to using gdbarch_program_breakpoint_here_p as opposed to
> gdbarch_insn_is_breakpoint.
> - Fixed matching of brk instructions. Previously the mask was incorrect, which
> was showing up as a few failures in the testsuite. Now it is clean.
> - New testcase (separate patch).
> - Moved program_breakpoint_here () to arch-utils.c and made it the default
> implementation of gdbarch_program_breakpoint_here_p.
> 
> --
> 
> It was reported to me that program breakpoints (permanent ones inserted into
> the code itself) other than the one GDB uses for AArch64 (0xd4200000) do not
> generate visible stops when continuing, and GDB will continue spinning
> infinitely.
> 
> This happens because GDB, upon hitting one of those program breakpoints, thinks
> the SIGTRAP came from a delayed breakpoint hit...
> 
> (gdb) x/i $pc
> => 0x4005c0 <problem_function>: brk     #0x90f
> (gdb) c
> Continuing.
> infrun: clear_proceed_status_thread (process 14198)
> infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
> infrun: proceed: resuming process 14198
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
> infrun: infrun_async(1)
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14198.14198.0 [process 14198],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: delayed software breakpoint trap, ignoring
> infrun: no stepping, continue
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14198.14198.0 [process 14198],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: delayed software breakpoint trap, ignoring
> infrun: no stepping, continue
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14198.14198.0 [process 14198],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: delayed software breakpoint trap, ignoring
> infrun: no stepping, continue
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14198.14198.0 [process 14198],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: delayed software breakpoint trap, ignoring
> infrun: no stepping, continue
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14198] at 0x4005c0
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14198.14198.0 [process 14198],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> ...
> 
> ... which is not the case.
> 
> If the program breakpoint is one GDB recognizes, then it will stop when it
> hits it.
> 
> (gdb) x/i $pc
> => 0x4005c0 <problem_function>: brk     #0x0
> (gdb) c
> Continuing.
> infrun: clear_proceed_status_thread (process 14193)
> infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
> infrun: proceed: resuming process 14193
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 14193] at 0x4005c0
> infrun: infrun_async(1)
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   14193.14193.0 [process 14193],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: random signal (GDB_SIGNAL_TRAP)
> infrun: stop_waiting
> infrun: stop_all_threads
> infrun: stop_all_threads, pass=0, iterations=0
> infrun:   process 14193 not executing
> infrun: stop_all_threads, pass=1, iterations=1
> infrun:   process 14193 not executing
> infrun: stop_all_threads done
> 
> Program received signal SIGTRAP, Trace/breakpoint trap.
> problem_function () at brk_0.c:7
> 7        asm("brk %0\n\t" ::"n"(0x0));
> infrun: infrun_async(0)
> 
> Otherwise GDB will keep trying to resume the inferior and will keep
> seeing the SIGTRAP's, without stopping.
> 
> To the user it appears GDB has gone into an infinite loop, interruptible only
> by Ctrl-C.
> 
> Also, windbg seems to use a different variation of AArch64 breakpoint compared
> to GDB. This causes problems when debugging Windows on ARM binaries, when
> program breakpoints are being used.
> 
> The proposed patch creates a new gdbarch method (gdbarch_program_breakpoint_here_p)
> that tells GDB whether the underlying instruction is a breakpoint instruction
> or not.
> 
> This is more general than only checking for the instruction GDB uses as
> breakpoint.
> 
> The existing logic is still preserved for targets that do not implement this
> new gdbarch method.
> 
> The end result is like so:
> 
> (gdb) x/i $pc
> => 0x4005c0 <problem_function>: brk     #0x90f
> (gdb) c
> Continuing.
> infrun: clear_proceed_status_thread (process 16417)
> infrun: proceed (addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT)
> infrun: proceed: resuming process 16417
> infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [process 16417] at 0x4005c0
> infrun: infrun_async(1)
> infrun: prepare_to_wait
> infrun: target_wait (-1.0.0, status) =
> infrun:   16417.16417.0 [process 16417],
> infrun:   status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: handle_inferior_event status->kind = stopped, signal = GDB_SIGNAL_TRAP
> infrun: stop_pc = 0x4005c0
> infrun: random signal (GDB_SIGNAL_TRAP)
> infrun: stop_waiting
> infrun: stop_all_threads
> infrun: stop_all_threads, pass=0, iterations=0
> infrun:   process 16417 not executing
> infrun: stop_all_threads, pass=1, iterations=1
> infrun:   process 16417 not executing
> infrun: stop_all_threads done
> 
> Program received signal SIGTRAP, Trace/breakpoint trap.
> problem_function () at brk.c:7
> 7        asm("brk %0\n\t" ::"n"(0x900 + 0xf));
> infrun: infrun_async(0)
> 
> gdb/ChangeLog:
> 
> 2020-01-15  Luis Machado  <luis.machado@linaro.org>
> 
> 	* aarch64-tdep.c (BRK_INSN_MASK): Define to 0xffe0001f.
> 	(BRK_INSN_MASK): Define to 0xd4200000.
> 	(aarch64_program_breakpoint_here_p): New function.
> 	(aarch64_gdbarch_init): Set gdbarch_program_breakpoint_here_p hook.
> 	* arch-utils.c (default_program_breakpoint_here_p): Moved from
> 	breakpoint.c.
> 	* arch-utils.h (default_program_breakpoint_here_p): Moved from
> 	breakpoint.h
> 	* breakpoint.c (bp_loc_is_permanent): Changed return type to bool and
> 	call gdbarch_program_breakpoint_here_p.
> 	(program_breakpoint_here): Moved to arch-utils.c, renamed to
> 	default_program_breakpoint_here_p, changed return type to bool and
> 	simplified.
> 	* breakpoint.h (program_breakpoint_here): Moved prototype to
> 	arch-utils.h, renamed to default_program_breakpoint_here_p and changed
> 	return type to bool.
> 	* gdbarch.c: Regenerate.
> 	* gdbarch.h: Regenerate.
> 	* gdbarch.sh (program_breakpoint_here_p): New method.
> 	* infrun.c (handle_signal_stop): Call
> 	gdbarch_program_breakpoint_here_p.
> ---
> gdb/aarch64-tdep.c | 37 +++++++++++++++++++++++++++++++++++++
> gdb/arch-utils.c   | 32 ++++++++++++++++++++++++++++++++
> gdb/arch-utils.h   |  4 ++++
> gdb/breakpoint.c   | 46 +++++++---------------------------------------
> gdb/breakpoint.h   |  5 -----
> gdb/gdbarch.c      | 23 +++++++++++++++++++++++
> gdb/gdbarch.h      |  7 +++++++
> gdb/gdbarch.sh     |  4 ++++
> gdb/infrun.c       |  4 ++--
> 9 files changed, 116 insertions(+), 46 deletions(-)
> 
> diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
> index 8451a916dc..7f32df3ec0 100644
> --- a/gdb/aarch64-tdep.c
> +++ b/gdb/aarch64-tdep.c
> @@ -1201,6 +1201,39 @@ aarch64_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op,
>   return false;
> }
> 
> +/* Used for matching BRK instructions for AArch64.  */
> +static constexpr uint32_t BRK_INSN_MASK = 0xffe0001f;
> +static constexpr uint32_t BRK_INSN_BASE = 0xd4200000;
> +
> +/* Implementation of gdbarch_program_breakpoint_here_p for aarch64.  */
> +
> +static bool
> +aarch64_program_breakpoint_here_p (gdbarch *gdbarch, CORE_ADDR address)
> +{
> +  const uint32_t insn_len = 4;
> +  gdb_byte target_mem[4];
> +
> +  /* Enable the automatic memory restoration from breakpoints while
> +     we read the memory.  Otherwise we may find temporary breakpoints, ones
> +     inserted by GDB, and flag them as permanent breakpoints.  */
> +  scoped_restore restore_memory
> +    = make_scoped_restore_show_memory_breakpoints (0);
> +
> +  if (target_read_memory (address, target_mem, insn_len) == 0)
> +    {
> +      uint32_t insn =
> +	(uint32_t) extract_unsigned_integer (target_mem, insn_len,
> +					     gdbarch_byte_order_for_code (gdbarch));
> +
> +      /* Check if INSN is a BRK instruction pattern.  There are multiple choices
> +	 of such instructions with different immediate values.  Different OS'
> +	 may use a different variation, but they have the same outcome.  */
> +	return ((insn & BRK_INSN_MASK) == BRK_INSN_BASE);
> +    }
> +
> +  return false;
> +}
> +
> /* When arguments must be pushed onto the stack, they go on in reverse
>    order.  The code below implements a FILO (stack) to do this.  */
> 
> @@ -3357,6 +3390,10 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
>   set_gdbarch_execute_dwarf_cfa_vendor_op (gdbarch,
> 					   aarch64_execute_dwarf_cfa_vendor_op);
> 
> +  /* Permanent/Program breakpoint handling.  */
> +  set_gdbarch_program_breakpoint_here_p (gdbarch,
> +					 aarch64_program_breakpoint_here_p);
> +
>   /* Add some default predicates.  */
>   frame_unwind_append_unwinder (gdbarch, &aarch64_stub_unwind);
>   dwarf2_append_unwinders (gdbarch);
> diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c
> index 92d7153ccb..04955ea847 100644
> --- a/gdb/arch-utils.c
> +++ b/gdb/arch-utils.c
> @@ -876,6 +876,38 @@ int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
>   return 0;
> }
> 
> +/*  See arch-utils.h.  */
> +
> +bool
> +default_program_breakpoint_here_p (struct gdbarch *gdbarch,
> +				   CORE_ADDR address)
> +{
> +  int len;
> +  const gdb_byte *bpoint = gdbarch_breakpoint_from_pc (gdbarch, &address, &len);
> +
> +  /* Software breakpoints unsupported?  */
> +  if (bpoint == nullptr)
> +    return false;
> +
> +  gdb_byte *target_mem = (gdb_byte *) alloca (len);
> +
> +  /* Enable the automatic memory restoration from breakpoints while
> +     we read the memory.  Otherwise we may find temporary breakpoints, ones
> +     inserted by GDB, and flag them as permanent breakpoints.  */
> +  scoped_restore restore_memory
> +    = make_scoped_restore_show_memory_breakpoints (0);
> +
> +  if (target_read_memory (address, target_mem, len) == 0)
> +    {
> +      /* Check if this is a breakpoint instruction for this architecture,
> +	 including ones used by GDB.  */
> +      if (memcmp (target_mem, bpoint, len) == 0)
> +	return true;
> +    }
> +
> +  return false;
> +}
> +
> void
> default_skip_permanent_breakpoint (struct regcache *regcache)
> {
> diff --git a/gdb/arch-utils.h b/gdb/arch-utils.h
> index 3fb9ad317a..43d64b1f4f 100644
> --- a/gdb/arch-utils.h
> +++ b/gdb/arch-utils.h
> @@ -228,6 +228,10 @@ extern int default_insn_is_call (struct gdbarch *, CORE_ADDR);
> extern int default_insn_is_ret (struct gdbarch *, CORE_ADDR);
> extern int default_insn_is_jump (struct gdbarch *, CORE_ADDR);
> 
> +/* Default implementation of gdbarch_program_breakpoint_here_p.  */
> +extern bool default_program_breakpoint_here_p (struct gdbarch *gdbarch,
> +					       CORE_ADDR addr);
> +
> /* Do-nothing version of vsyscall_range.  Returns false.  */
> 
> extern int default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range);
> diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
> index a7a378131a..5a9352c26f 100644
> --- a/gdb/breakpoint.c
> +++ b/gdb/breakpoint.c
> @@ -8515,7 +8515,7 @@ mention (struct breakpoint *b)
> }
> 
> 
> -static int bp_loc_is_permanent (struct bp_location *loc);
> +static bool bp_loc_is_permanent (struct bp_location *loc);
> 
> static struct bp_location *
> add_location_to_breakpoint (struct breakpoint *b,
> @@ -8581,42 +8581,10 @@ add_location_to_breakpoint (struct breakpoint *b,
> }
> 
> 
> -/* See breakpoint.h.  */
> -
> -int
> -program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address)
> -{
> -  int len;
> -  CORE_ADDR addr;
> -  const gdb_byte *bpoint;
> -  gdb_byte *target_mem;
> -
> -  addr = address;
> -  bpoint = gdbarch_breakpoint_from_pc (gdbarch, &addr, &len);
> -
> -  /* Software breakpoints unsupported?  */
> -  if (bpoint == NULL)
> -    return 0;
> -
> -  target_mem = (gdb_byte *) alloca (len);
> -
> -  /* Enable the automatic memory restoration from breakpoints while
> -     we read the memory.  Otherwise we could say about our temporary
> -     breakpoints they are permanent.  */
> -  scoped_restore restore_memory
> -    = make_scoped_restore_show_memory_breakpoints (0);
> +/* Return true if LOC is pointing to a permanent breakpoint,
> +   return false otherwise.  */
> 
> -  if (target_read_memory (address, target_mem, len) == 0
> -      && memcmp (target_mem, bpoint, len) == 0)
> -    return 1;
> -
> -  return 0;
> -}
> -
> -/* Return 1 if LOC is pointing to a permanent breakpoint,
> -   return 0 otherwise.  */
> -
> -static int
> +static bool
> bp_loc_is_permanent (struct bp_location *loc)
> {
>   gdb_assert (loc != NULL);
> @@ -8624,14 +8592,14 @@ bp_loc_is_permanent (struct bp_location *loc)
>   /* If we have a non-breakpoint-backed catchpoint or a software
>      watchpoint, just return 0.  We should not attempt to read from
>      the addresses the locations of these breakpoint types point to.
> -     program_breakpoint_here_p, below, will attempt to read
> +     gdbarch_program_breakpoint_here_p, below, will attempt to read
>      memory.  */
>   if (!bl_address_is_meaningful (loc))
> -    return 0;
> +    return false;
> 
>   scoped_restore_current_pspace_and_thread restore_pspace_thread;
>   switch_to_program_space_and_thread (loc->pspace);
> -  return program_breakpoint_here_p (loc->gdbarch, loc->address);
> +  return gdbarch_program_breakpoint_here_p (loc->gdbarch, loc->address);
> }
> 
> /* Build a command list for the dprintf corresponding to the current
> diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h
> index 13d8102c17..347aeb75f3 100644
> --- a/gdb/breakpoint.h
> +++ b/gdb/breakpoint.h
> @@ -1194,11 +1194,6 @@ enum breakpoint_here
> 
> /* Prototypes for breakpoint-related functions.  */
> 
> -/* Return 1 if there's a program/permanent breakpoint planted in
> -   memory at ADDRESS, return 0 otherwise.  */
> -
> -extern int program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address);
> -
> extern enum breakpoint_here breakpoint_here_p (const address_space *,
> 					       CORE_ADDR);
> 
> diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
> index cc8569f5c9..d763fc85e6 100644
> --- a/gdb/gdbarch.c
> +++ b/gdb/gdbarch.c
> @@ -345,6 +345,7 @@ struct gdbarch
>   gdbarch_insn_is_call_ftype *insn_is_call;
>   gdbarch_insn_is_ret_ftype *insn_is_ret;
>   gdbarch_insn_is_jump_ftype *insn_is_jump;
> +  gdbarch_program_breakpoint_here_p_ftype *program_breakpoint_here_p;
>   gdbarch_auxv_parse_ftype *auxv_parse;
>   gdbarch_print_auxv_entry_ftype *print_auxv_entry;
>   gdbarch_vsyscall_range_ftype *vsyscall_range;
> @@ -464,6 +465,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
>   gdbarch->insn_is_call = default_insn_is_call;
>   gdbarch->insn_is_ret = default_insn_is_ret;
>   gdbarch->insn_is_jump = default_insn_is_jump;
> +  gdbarch->program_breakpoint_here_p = default_program_breakpoint_here_p;
>   gdbarch->print_auxv_entry = default_print_auxv_entry;
>   gdbarch->vsyscall_range = default_vsyscall_range;
>   gdbarch->infcall_mmap = default_infcall_mmap;
> @@ -708,6 +710,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
>   /* Skip verify of insn_is_call, invalid_p == 0 */
>   /* Skip verify of insn_is_ret, invalid_p == 0 */
>   /* Skip verify of insn_is_jump, invalid_p == 0 */
> +  /* Skip verify of program_breakpoint_here_p, invalid_p == 0 */
>   /* Skip verify of auxv_parse, has predicate.  */
>   /* Skip verify of print_auxv_entry, invalid_p == 0 */
>   /* Skip verify of vsyscall_range, invalid_p == 0 */
> @@ -1248,6 +1251,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
>   fprintf_unfiltered (file,
>                       "gdbarch_dump: process_record_signal = <%s>\n",
>                       host_address_to_string (gdbarch->process_record_signal));
> +  fprintf_unfiltered (file,
> +                      "gdbarch_dump: program_breakpoint_here_p = <%s>\n",
> +                      host_address_to_string (gdbarch->program_breakpoint_here_p));
>   fprintf_unfiltered (file,
>                       "gdbarch_dump: ps_regnum = %s\n",
>                       plongest (gdbarch->ps_regnum));
> @@ -4928,6 +4934,23 @@ set_gdbarch_insn_is_jump (struct gdbarch *gdbarch,
>   gdbarch->insn_is_jump = insn_is_jump;
> }
> 
> +bool
> +gdbarch_program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address)
> +{
> +  gdb_assert (gdbarch != NULL);
> +  gdb_assert (gdbarch->program_breakpoint_here_p != NULL);
> +  if (gdbarch_debug >= 2)
> +    fprintf_unfiltered (gdb_stdlog, "gdbarch_program_breakpoint_here_p called\n");
> +  return gdbarch->program_breakpoint_here_p (gdbarch, address);
> +}
> +
> +void
> +set_gdbarch_program_breakpoint_here_p (struct gdbarch *gdbarch,
> +                                       gdbarch_program_breakpoint_here_p_ftype program_breakpoint_here_p)
> +{
> +  gdbarch->program_breakpoint_here_p = program_breakpoint_here_p;
> +}
> +
> int
> gdbarch_auxv_parse_p (struct gdbarch *gdbarch)
> {
> diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
> index 9f32ac23ab..800a4e8b16 100644
> --- a/gdb/gdbarch.h
> +++ b/gdb/gdbarch.h
> @@ -1545,6 +1545,13 @@ typedef int (gdbarch_insn_is_jump_ftype) (struct gdbarch *gdbarch, CORE_ADDR add
> extern int gdbarch_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr);
> extern void set_gdbarch_insn_is_jump (struct gdbarch *gdbarch, gdbarch_insn_is_jump_ftype *insn_is_jump);
> 
> +/* Return true if there's a program/permanent breakpoint planted in
> +   memory at ADDRESS, return false otherwise. */
> +
> +typedef bool (gdbarch_program_breakpoint_here_p_ftype) (struct gdbarch *gdbarch, CORE_ADDR address);
> +extern bool gdbarch_program_breakpoint_here_p (struct gdbarch *gdbarch, CORE_ADDR address);
> +extern void set_gdbarch_program_breakpoint_here_p (struct gdbarch *gdbarch, gdbarch_program_breakpoint_here_p_ftype *program_breakpoint_here_p);
> +
> /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
>    Return 0 if *READPTR is already at the end of the buffer.
>    Return -1 if there is insufficient buffer for a whole entry.
> diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
> index 0be3e88bb2..66b54dd700 100755
> --- a/gdb/gdbarch.sh
> +++ b/gdb/gdbarch.sh
> @@ -1152,6 +1152,10 @@ m;int;insn_is_ret;CORE_ADDR addr;addr;;default_insn_is_ret;;0
> # Return non-zero if the instruction at ADDR is a jump; zero otherwise.
> m;int;insn_is_jump;CORE_ADDR addr;addr;;default_insn_is_jump;;0
> 
> +# Return true if there's a program/permanent breakpoint planted in
> +# memory at ADDRESS, return false otherwise.
> +m;bool;program_breakpoint_here_p;CORE_ADDR address;address;;default_program_breakpoint_here_p;;0
> +
> # Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
> # Return 0 if *READPTR is already at the end of the buffer.
> # Return -1 if there is insufficient buffer for a whole entry.
> diff --git a/gdb/infrun.c b/gdb/infrun.c
> index a8636284f1..494324d72b 100644
> --- a/gdb/infrun.c
> +++ b/gdb/infrun.c
> @@ -6157,8 +6157,8 @@ handle_signal_stop (struct execution_control_state *ecs)
>      been removed.  */
>   if (random_signal && target_stopped_by_sw_breakpoint ())
>     {
> -      if (program_breakpoint_here_p (gdbarch,
> -				     ecs->event_thread->suspend.stop_pc))
> +      if (gdbarch_program_breakpoint_here_p (gdbarch,
> +					     ecs->event_thread->suspend.stop_pc))
> 	{
> 	  struct regcache *regcache;
> 	  int decr_pc;
> -- 
> 2.17.1
> 

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