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Skip unwritable frames in command "finish"
Nowadays, GDB can't insert breakpoint on the return address of the exception handler on ARM M-profile, because the address is a magic one 0xfffffff9, (gdb) bt #0 CT32B1_IRQHandler () at ../src/timer.c:67 #1 <signal handler called> #2 main () at ../src/timer.c:127 (gdb) info frame Stack level 0, frame at 0x200ffa8: pc = 0x4ec in CT32B1_IRQHandler (../src/timer.c:67); saved pc = 0xfffffff9 called by frame at 0x200ffc8 source language c. Arglist at 0x200ffa0, args: Locals at 0x200ffa0, Previous frame's sp is 0x200ffa8 Saved registers: r7 at 0x200ffa0, lr at 0x200ffa4 (gdb) x/x 0xfffffff9 0xfffffff9: Cannot access memory at address 0xfffffff9 (gdb) finish Run till exit from #0 CT32B1_IRQHandler () at ../src/timer.c:67 Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?) Warning: Cannot insert hardware breakpoint 0. Could not insert hardware breakpoints: You may have requested too many hardware breakpoints/watchpoints. Command aborted. even some debug probe can't set hardware breakpoint on the magic address too, (gdb) hbreak *0xfffffff9 Hardware assisted breakpoint 2 at 0xfffffff9 (gdb) c Continuing. Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?) Warning: Cannot insert hardware breakpoint 2. Could not insert hardware breakpoints: You may have requested too many hardware breakpoints/watchpoints. Command aborted. The problem described above is quite similar to PR 8841, in which GDB can't set breakpoint on signal trampoline, which is mapped to a read-only page by kernel. The rationale of this patch is to skip "unwritable" frames when looking for caller frames in command "finish", and a new gdbarch method code_of_frame_writable is added. This patch fixes the problem on ARM cortex-m target, but it can be used to fix PR 8841 too. gdb: 2016-05-10 Yao Qi <yao.qi@arm.com> * arch-utils.c (default_code_of_frame_writable): New function. * arch-utils.h (default_code_of_frame_writable): Declare. * arm-tdep.c (arm_code_of_frame_writable): New function. (arm_gdbarch_init): Install gdbarch method code_of_frame_writable if the target is M-profile. * frame.c (skip_unwritable_frames): New function. * frame.h (skip_unwritable_frames): Declare. * gdbarch.sh (code_of_frame_writable): New. * gdbarch.c, gdbarch.h: Re-generated. * infcmd.c (finish_command): Call skip_unwritable_frames.
This commit is contained in:
Yao Qi
Yao Qi
parent
0f6ed0e0ef
commit
7eb895307f
@ -1,3 +1,16 @@
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2016-05-23 Yao Qi <yao.qi@arm.com>
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* arch-utils.c (default_code_of_frame_writable): New function.
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* arch-utils.h (default_code_of_frame_writable): Declare.
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* arm-tdep.c (arm_code_of_frame_writable): New function.
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(arm_gdbarch_init): Install gdbarch method
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code_of_frame_writable if the target is M-profile.
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* frame.c (skip_unwritable_frames): New function.
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* frame.h (skip_unwritable_frames): Declare.
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* gdbarch.sh (code_of_frame_writable): New.
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* gdbarch.c, gdbarch.h: Re-generated.
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* infcmd.c (finish_command): Call skip_unwritable_frames.
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2016-05-23 Tom Tromey <tom@tromey.com>
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PR python/19438, PR python/18393:
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@ -132,6 +132,13 @@ generic_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
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return 0;
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}
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int
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default_code_of_frame_writable (struct gdbarch *gdbarch,
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struct frame_info *frame)
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{
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return 1;
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}
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/* Helper functions for gdbarch_inner_than */
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int
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@ -107,6 +107,9 @@ extern int generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
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extern int generic_stack_frame_destroyed_p (struct gdbarch *gdbarch,
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CORE_ADDR pc);
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extern int default_code_of_frame_writable (struct gdbarch *gdbarch,
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struct frame_info *frame);
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/* By default, registers are not convertible. */
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extern int generic_convert_register_p (struct gdbarch *gdbarch, int regnum,
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struct type *type);
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@ -8862,6 +8862,22 @@ arm_register_g_packet_guesses (struct gdbarch *gdbarch)
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/* Otherwise we don't have a useful guess. */
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}
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/* Implement the code_of_frame_writable gdbarch method. */
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static int
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arm_code_of_frame_writable (struct gdbarch *gdbarch, struct frame_info *frame)
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{
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if (gdbarch_tdep (gdbarch)->is_m
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&& get_frame_type (frame) == SIGTRAMP_FRAME)
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{
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/* M-profile exception frames return to some magic PCs, where
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isn't writable at all. */
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return 0;
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}
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else
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return 1;
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}
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/* Initialize the current architecture based on INFO. If possible,
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re-use an architecture from ARCHES, which is a list of
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@ -9312,6 +9328,9 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call);
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set_gdbarch_frame_align (gdbarch, arm_frame_align);
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if (is_m)
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set_gdbarch_code_of_frame_writable (gdbarch, arm_code_of_frame_writable);
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set_gdbarch_write_pc (gdbarch, arm_write_pc);
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/* Frame handling. */
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13
gdb/frame.c
13
gdb/frame.c
@ -444,6 +444,19 @@ skip_artificial_frames (struct frame_info *frame)
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return frame;
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}
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struct frame_info *
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skip_unwritable_frames (struct frame_info *frame)
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{
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while (gdbarch_code_of_frame_writable (get_frame_arch (frame), frame) == 0)
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{
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frame = get_prev_frame (frame);
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if (frame == NULL)
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break;
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}
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return frame;
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}
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/* See frame.h. */
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struct frame_info *
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@ -826,4 +826,9 @@ extern enum language get_frame_language (struct frame_info *frame);
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extern struct frame_info *skip_tailcall_frames (struct frame_info *frame);
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/* Return the first frame above FRAME or FRAME of which the code is
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writable. */
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extern struct frame_info *skip_unwritable_frames (struct frame_info *frame);
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#endif /* !defined (FRAME_H) */
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@ -205,6 +205,7 @@ struct gdbarch
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gdbarch_push_dummy_call_ftype *push_dummy_call;
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int call_dummy_location;
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gdbarch_push_dummy_code_ftype *push_dummy_code;
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gdbarch_code_of_frame_writable_ftype *code_of_frame_writable;
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gdbarch_print_registers_info_ftype *print_registers_info;
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gdbarch_print_float_info_ftype *print_float_info;
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gdbarch_print_vector_info_ftype *print_vector_info;
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@ -387,6 +388,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
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gdbarch->dwarf2_reg_to_regnum = no_op_reg_to_regnum;
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gdbarch->deprecated_fp_regnum = -1;
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gdbarch->call_dummy_location = AT_ENTRY_POINT;
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gdbarch->code_of_frame_writable = default_code_of_frame_writable;
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gdbarch->print_registers_info = default_print_registers_info;
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gdbarch->print_float_info = default_print_float_info;
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gdbarch->register_sim_regno = legacy_register_sim_regno;
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@ -552,6 +554,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
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/* Skip verify of push_dummy_call, has predicate. */
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/* Skip verify of call_dummy_location, invalid_p == 0 */
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/* Skip verify of push_dummy_code, has predicate. */
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/* Skip verify of code_of_frame_writable, invalid_p == 0 */
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/* Skip verify of print_registers_info, invalid_p == 0 */
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/* Skip verify of print_float_info, invalid_p == 0 */
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/* Skip verify of print_vector_info, has predicate. */
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@ -803,6 +806,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
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fprintf_unfiltered (file,
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"gdbarch_dump: char_signed = %s\n",
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plongest (gdbarch->char_signed));
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fprintf_unfiltered (file,
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"gdbarch_dump: code_of_frame_writable = <%s>\n",
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host_address_to_string (gdbarch->code_of_frame_writable));
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fprintf_unfiltered (file,
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"gdbarch_dump: coff_make_msymbol_special = <%s>\n",
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host_address_to_string (gdbarch->coff_make_msymbol_special));
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@ -2314,6 +2320,23 @@ set_gdbarch_push_dummy_code (struct gdbarch *gdbarch,
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gdbarch->push_dummy_code = push_dummy_code;
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}
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int
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gdbarch_code_of_frame_writable (struct gdbarch *gdbarch, struct frame_info *frame)
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{
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gdb_assert (gdbarch != NULL);
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gdb_assert (gdbarch->code_of_frame_writable != NULL);
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if (gdbarch_debug >= 2)
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fprintf_unfiltered (gdb_stdlog, "gdbarch_code_of_frame_writable called\n");
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return gdbarch->code_of_frame_writable (gdbarch, frame);
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}
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void
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set_gdbarch_code_of_frame_writable (struct gdbarch *gdbarch,
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gdbarch_code_of_frame_writable_ftype code_of_frame_writable)
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{
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gdbarch->code_of_frame_writable = code_of_frame_writable;
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}
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void
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gdbarch_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, struct frame_info *frame, int regnum, int all)
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{
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@ -395,6 +395,12 @@ typedef CORE_ADDR (gdbarch_push_dummy_code_ftype) (struct gdbarch *gdbarch, CORE
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extern CORE_ADDR gdbarch_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp, CORE_ADDR funaddr, struct value **args, int nargs, struct type *value_type, CORE_ADDR *real_pc, CORE_ADDR *bp_addr, struct regcache *regcache);
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extern void set_gdbarch_push_dummy_code (struct gdbarch *gdbarch, gdbarch_push_dummy_code_ftype *push_dummy_code);
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/* Return true if the code of FRAME is writable. */
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typedef int (gdbarch_code_of_frame_writable_ftype) (struct gdbarch *gdbarch, struct frame_info *frame);
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extern int gdbarch_code_of_frame_writable (struct gdbarch *gdbarch, struct frame_info *frame);
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extern void set_gdbarch_code_of_frame_writable (struct gdbarch *gdbarch, gdbarch_code_of_frame_writable_ftype *code_of_frame_writable);
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typedef void (gdbarch_print_registers_info_ftype) (struct gdbarch *gdbarch, struct ui_file *file, struct frame_info *frame, int regnum, int all);
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extern void gdbarch_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file, struct frame_info *frame, int regnum, int all);
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extern void set_gdbarch_print_registers_info (struct gdbarch *gdbarch, gdbarch_print_registers_info_ftype *print_registers_info);
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@ -485,6 +485,9 @@ M:CORE_ADDR:push_dummy_call:struct value *function, struct regcache *regcache, C
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v:int:call_dummy_location::::AT_ENTRY_POINT::0
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M:CORE_ADDR:push_dummy_code:CORE_ADDR sp, CORE_ADDR funaddr, struct value **args, int nargs, struct type *value_type, CORE_ADDR *real_pc, CORE_ADDR *bp_addr, struct regcache *regcache:sp, funaddr, args, nargs, value_type, real_pc, bp_addr, regcache
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# Return true if the code of FRAME is writable.
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m:int:code_of_frame_writable:struct frame_info *frame:frame::default_code_of_frame_writable::0
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m:void:print_registers_info:struct ui_file *file, struct frame_info *frame, int regnum, int all:file, frame, regnum, all::default_print_registers_info::0
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m:void:print_float_info:struct ui_file *file, struct frame_info *frame, const char *args:file, frame, args::default_print_float_info::0
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M:void:print_vector_info:struct ui_file *file, struct frame_info *frame, const char *args:file, frame, args
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@ -2029,6 +2029,8 @@ finish_command (char *arg, int from_tty)
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entering THISFRAME. */
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frame = skip_tailcall_frames (frame);
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frame = skip_unwritable_frames (frame);
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if (frame == NULL)
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error (_("Cannot find the caller frame."));
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