* gdbarch.sh (displaced_step_hw_singlestep): New callback.
* gdbarch.c, gdbarch.h: Regenerate. * arch-utils.c (default_displaced_step_hw_singlestep): New function. * arch-utils.h (default_displaced_step_hw_singlestep): Add prototype. * ppc-linux-tdep.c (ppc_displaced_step_hw_singlestep): New function. (rs6000_gdbarch_init): Install it. * infrun.c (displaced_step_fixup): Use new callback to determine whether to "step" or "continue" displaced copy. (resume): Likewise. Do not call maybe_software_singlestep for displaced stepping. (maybe_software_singlestep): Do not handle displaced stepping.
This commit is contained in:
Ulrich Weigand
parent
69368a60a4
commit
99e4058030
8 changed files with 103 additions and 16 deletions
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@ -1,3 +1,19 @@
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2009-09-28 Ulrich Weigand <uweigand@de.ibm.com>
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* gdbarch.sh (displaced_step_hw_singlestep): New callback.
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* gdbarch.c, gdbarch.h: Regenerate.
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* arch-utils.c (default_displaced_step_hw_singlestep): New function.
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* arch-utils.h (default_displaced_step_hw_singlestep): Add prototype.
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* ppc-linux-tdep.c (ppc_displaced_step_hw_singlestep): New function.
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(rs6000_gdbarch_init): Install it.
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* infrun.c (displaced_step_fixup): Use new callback to determine
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whether to "step" or "continue" displaced copy.
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(resume): Likewise. Do not call maybe_software_singlestep
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for displaced stepping.
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(maybe_software_singlestep): Do not handle displaced stepping.
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2009-09-28 Ulrich Weigand <uweigand@de.ibm.com>
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* eval.c (evaluate_subexp_standard) [OP_OBJC_MSGCALL]: Support
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@ -67,6 +67,12 @@ simple_displaced_step_free_closure (struct gdbarch *gdbarch,
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xfree (closure);
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}
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int
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default_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
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struct displaced_step_closure *closure)
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{
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return !gdbarch_software_single_step_p (gdbarch);
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}
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CORE_ADDR
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displaced_step_at_entry_point (struct gdbarch *gdbarch)
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@ -49,6 +49,11 @@ extern void
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simple_displaced_step_free_closure (struct gdbarch *gdbarch,
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struct displaced_step_closure *closure);
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/* Default implementation of gdbarch_displaced_hw_singlestep. */
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extern int
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default_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
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struct displaced_step_closure *closure);
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/* Possible value for gdbarch_displaced_step_location:
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Place displaced instructions at the program's entry point,
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leaving space for inferior function call return breakpoints. */
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@ -232,6 +232,7 @@ struct gdbarch
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gdbarch_skip_permanent_breakpoint_ftype *skip_permanent_breakpoint;
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ULONGEST max_insn_length;
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gdbarch_displaced_step_copy_insn_ftype *displaced_step_copy_insn;
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gdbarch_displaced_step_hw_singlestep_ftype *displaced_step_hw_singlestep;
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gdbarch_displaced_step_fixup_ftype *displaced_step_fixup;
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gdbarch_displaced_step_free_closure_ftype *displaced_step_free_closure;
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gdbarch_displaced_step_location_ftype *displaced_step_location;
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@ -371,6 +372,7 @@ struct gdbarch startup_gdbarch =
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0, /* skip_permanent_breakpoint */
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0, /* max_insn_length */
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0, /* displaced_step_copy_insn */
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default_displaced_step_hw_singlestep, /* displaced_step_hw_singlestep */
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0, /* displaced_step_fixup */
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NULL, /* displaced_step_free_closure */
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NULL, /* displaced_step_location */
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@ -464,6 +466,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
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gdbarch->elf_make_msymbol_special = default_elf_make_msymbol_special;
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gdbarch->coff_make_msymbol_special = default_coff_make_msymbol_special;
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gdbarch->register_reggroup_p = default_register_reggroup_p;
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gdbarch->displaced_step_hw_singlestep = default_displaced_step_hw_singlestep;
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gdbarch->displaced_step_fixup = NULL;
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gdbarch->displaced_step_free_closure = NULL;
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gdbarch->displaced_step_location = NULL;
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@ -627,6 +630,7 @@ verify_gdbarch (struct gdbarch *gdbarch)
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/* Skip verify of skip_permanent_breakpoint, has predicate */
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/* Skip verify of max_insn_length, has predicate */
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/* Skip verify of displaced_step_copy_insn, has predicate */
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/* Skip verify of displaced_step_hw_singlestep, invalid_p == 0 */
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/* Skip verify of displaced_step_fixup, has predicate */
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if ((! gdbarch->displaced_step_free_closure) != (! gdbarch->displaced_step_copy_insn))
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fprintf_unfiltered (log, "\n\tdisplaced_step_free_closure");
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@ -790,6 +794,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
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fprintf_unfiltered (file,
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"gdbarch_dump: displaced_step_free_closure = <%s>\n",
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host_address_to_string (gdbarch->displaced_step_free_closure));
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fprintf_unfiltered (file,
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"gdbarch_dump: displaced_step_hw_singlestep = <%s>\n",
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host_address_to_string (gdbarch->displaced_step_hw_singlestep));
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fprintf_unfiltered (file,
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"gdbarch_dump: displaced_step_location = <%s>\n",
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host_address_to_string (gdbarch->displaced_step_location));
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@ -3144,6 +3151,23 @@ set_gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch,
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gdbarch->displaced_step_copy_insn = displaced_step_copy_insn;
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}
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int
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gdbarch_displaced_step_hw_singlestep (struct gdbarch *gdbarch, struct displaced_step_closure *closure)
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{
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gdb_assert (gdbarch != NULL);
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gdb_assert (gdbarch->displaced_step_hw_singlestep != NULL);
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if (gdbarch_debug >= 2)
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fprintf_unfiltered (gdb_stdlog, "gdbarch_displaced_step_hw_singlestep called\n");
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return gdbarch->displaced_step_hw_singlestep (gdbarch, closure);
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}
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void
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set_gdbarch_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
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gdbarch_displaced_step_hw_singlestep_ftype displaced_step_hw_singlestep)
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{
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gdbarch->displaced_step_hw_singlestep = displaced_step_hw_singlestep;
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}
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int
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gdbarch_displaced_step_fixup_p (struct gdbarch *gdbarch)
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{
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@ -734,6 +734,20 @@ typedef struct displaced_step_closure * (gdbarch_displaced_step_copy_insn_ftype)
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extern struct displaced_step_closure * gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
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extern void set_gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, gdbarch_displaced_step_copy_insn_ftype *displaced_step_copy_insn);
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/* Return true if GDB should use hardware single-stepping to execute
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the displaced instruction identified by CLOSURE. If false,
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GDB will simply restart execution at the displaced instruction
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location, and it is up to the target to ensure GDB will receive
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control again (e.g. by placing a software breakpoint instruction
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into the displaced instruction buffer).
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The default implementation returns false on all targets that
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provide a gdbarch_software_single_step routine, and true otherwise. */
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typedef int (gdbarch_displaced_step_hw_singlestep_ftype) (struct gdbarch *gdbarch, struct displaced_step_closure *closure);
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extern int gdbarch_displaced_step_hw_singlestep (struct gdbarch *gdbarch, struct displaced_step_closure *closure);
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extern void set_gdbarch_displaced_step_hw_singlestep (struct gdbarch *gdbarch, gdbarch_displaced_step_hw_singlestep_ftype *displaced_step_hw_singlestep);
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/* Fix up the state resulting from successfully single-stepping a
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displaced instruction, to give the result we would have gotten from
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stepping the instruction in its original location.
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@ -654,6 +654,17 @@ V:ULONGEST:max_insn_length:::0:0
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# here.
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M:struct displaced_step_closure *:displaced_step_copy_insn:CORE_ADDR from, CORE_ADDR to, struct regcache *regs:from, to, regs
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# Return true if GDB should use hardware single-stepping to execute
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# the displaced instruction identified by CLOSURE. If false,
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# GDB will simply restart execution at the displaced instruction
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# location, and it is up to the target to ensure GDB will receive
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# control again (e.g. by placing a software breakpoint instruction
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# into the displaced instruction buffer).
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#
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# The default implementation returns false on all targets that
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# provide a gdbarch_software_single_step routine, and true otherwise.
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m:int:displaced_step_hw_singlestep:struct displaced_step_closure *closure:closure::default_displaced_step_hw_singlestep::0
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# Fix up the state resulting from successfully single-stepping a
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# displaced instruction, to give the result we would have gotten from
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# stepping the instruction in its original location.
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20
gdb/infrun.c
20
gdb/infrun.c
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@ -1002,10 +1002,11 @@ displaced_step_fixup (ptid_t event_ptid, enum target_signal signal)
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displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
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}
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if (gdbarch_software_single_step_p (gdbarch))
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target_resume (ptid, 0, TARGET_SIGNAL_0);
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else
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if (gdbarch_displaced_step_hw_singlestep
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(gdbarch, displaced_step_closure))
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target_resume (ptid, 1, TARGET_SIGNAL_0);
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else
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target_resume (ptid, 0, TARGET_SIGNAL_0);
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/* Done, we're stepping a thread. */
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break;
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@ -1114,11 +1115,8 @@ maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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int hw_step = 1;
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if (gdbarch_software_single_step_p (gdbarch))
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{
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if (use_displaced_stepping (gdbarch))
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hw_step = 0;
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else if (gdbarch_software_single_step (gdbarch, get_current_frame ()))
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if (gdbarch_software_single_step_p (gdbarch)
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&& gdbarch_software_single_step (gdbarch, get_current_frame ()))
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{
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hw_step = 0;
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/* Do not pull these breakpoints until after a `wait' in
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@ -1127,7 +1125,6 @@ maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc)
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singlestep_ptid = inferior_ptid;
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singlestep_pc = pc;
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}
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}
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return hw_step;
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}
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@ -1208,10 +1205,13 @@ a command like `return' or `jump' to continue execution."));
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discard_cleanups (old_cleanups);
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return;
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}
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step = gdbarch_displaced_step_hw_singlestep
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(gdbarch, displaced_step_closure);
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}
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/* Do we need to do it the hard way, w/temp breakpoints? */
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if (step)
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else if (step)
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step = maybe_software_singlestep (gdbarch, pc);
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if (should_resume)
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@ -1058,6 +1058,15 @@ ppc_displaced_step_fixup (struct gdbarch *gdbarch,
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from + offset);
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}
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/* Always use hardware single-stepping to execute the
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displaced instruction. */
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static int
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ppc_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
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struct displaced_step_closure *closure)
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{
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return 1;
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}
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/* Instruction masks used during single-stepping of atomic sequences. */
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#define LWARX_MASK 0xfc0007fe
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#define LWARX_INSTRUCTION 0x7c000028
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@ -3898,6 +3907,8 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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/* Setup displaced stepping. */
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set_gdbarch_displaced_step_copy_insn (gdbarch,
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simple_displaced_step_copy_insn);
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set_gdbarch_displaced_step_hw_singlestep (gdbarch,
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ppc_displaced_step_hw_singlestep);
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set_gdbarch_displaced_step_fixup (gdbarch, ppc_displaced_step_fixup);
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set_gdbarch_displaced_step_free_closure (gdbarch,
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simple_displaced_step_free_closure);
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