gdbarch software_single_step returns VEC (CORE_ADDR) *

This patch changes gdbarch method software_single_step to return a
vector of addresses on which GDB should insert breakpoints, and don't
insert breakpoints.  Instead, the caller of
gdbarch_software_single_step inserts breakpoints if the returned
vector is not NULL.

gdb:

2016-11-08  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_software_single_step): Return
	VEC (CORE_ADDR) *.  Return NULL instead of 0.  Don't call
	insert_single_step_breakpoint.
	* alpha-tdep.c (alpha_deal_with_atomic_sequence): Likewise.
	(alpha_software_single_step): Likewise.
	* alpha-tdep.h (alpha_software_single_step): Update declaration.
	* arm-linux-tdep.c (arm_linux_software_single_step): Return
	VEC (CORE_ADDR) *.  Return NULL instead of 0.
	* arm-tdep.c (arm_software_single_step): Return NULL instead of	0.
	* arm-tdep.h (arm_software_single_step): Update declaration.
	* breakpoint.c (insert_single_step_breakpoints): New function.
	* breakpoint.h (insert_single_step_breakpoints): Declare.
	* cris-tdep.c (cris_software_single_step): Return
	VEC (CORE_ADDR) *.  Don't call insert_single_step_breakpoint.
	* gdbarch.sh (software_single_step): Change it to return
	VEC (CORE_ADDR) *.
	* gdbarch.c, gdbarch.h: Regenerated.
	* infrun.c (maybe_software_singlestep): Adjust.
	* mips-tdep.c (mips_deal_with_atomic_sequence): Return
	VEC (CORE_ADDR) *.  Don't call insert_single_step_breakpoint.
	(micromips_deal_with_atomic_sequence): Likewise.
	(deal_with_atomic_sequence): Likewise.
	(mips_software_single_step): Likewise.
	* mips-tdep.h (mips_software_single_step): Update declaration.
	* moxie-tdep.c (moxie_software_single_step): Likewise.
	* nios2-tdep.c (nios2_software_single_step): Likewise.
	* ppc-tdep.h (ppc_deal_with_atomic_sequence): Update
	declaration.
	* record-full.c (record_full_resume): Adjust.
	(record_full_wait_1): Likewise.
	* rs6000-aix-tdep.c (rs6000_software_single_step): Return
	VEC (CORE_ADDR) *.  Don't call insert_single_step_breakpoint.
	* rs6000-tdep.c	(ppc_deal_with_atomic_sequence): Return
	VEC (CORE_ADDR) *.  Don't call insert_single_step_breakpoint.
	* s390-linux-tdep.c (s390_software_single_step): Likewise.
	* sparc-tdep.c (sparc_software_single_step): Likewise.
	* spu-tdep.c (spu_software_single_step): Likewise.
	* tic6x-tdep.c (tic6x_software_single_step): Likewise.

1 files changed, 7 insertions, 5 deletions

diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index acd52bbd95..a7a3937405 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -669,7 +669,7 @@ branch_dest (struct frame_info *frame, int opcode, int instr,
 
 /* AIX does not support PT_STEP.  Simulate it.  */
 
-static int
+static VEC (CORE_ADDR) *
 rs6000_software_single_step (struct frame_info *frame)
 {
   struct gdbarch *gdbarch = get_frame_arch (frame);
@@ -679,13 +679,15 @@ rs6000_software_single_step (struct frame_info *frame)
   CORE_ADDR loc;
   CORE_ADDR breaks[2];
   int opcode;
+  VEC (CORE_ADDR) *next_pcs;
 
   loc = get_frame_pc (frame);
 
   insn = read_memory_integer (loc, 4, byte_order);
 
-  if (ppc_deal_with_atomic_sequence (frame))
-    return 1;
+  next_pcs = ppc_deal_with_atomic_sequence (frame);
+  if (next_pcs != NULL)
+    return next_pcs;
   
   breaks[0] = loc + PPC_INSN_SIZE;
   opcode = insn >> 26;
@@ -700,12 +702,12 @@ rs6000_software_single_step (struct frame_info *frame)
       /* ignore invalid breakpoint.  */
       if (breaks[ii] == -1)
 	continue;
-      insert_single_step_breakpoint (gdbarch, aspace, breaks[ii]);
+      VEC_safe_push (CORE_ADDR, next_pcs, breaks[ii]);
     }
 
   errno = 0;			/* FIXME, don't ignore errors!  */
   /* What errors?  {read,write}_memory call error().  */
-  return 1;
+  return next_pcs;
 }
 
 /* Implement the "auto_wide_charset" gdbarch method for this platform.  */