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[AArch64][2/4] Generate dwarf information for -msign-return-address 

gcc/
	* reg-notes.def (CFA_TOGGLE_RA_MANGLE): New reg-note.
	* combine-stack-adj.c (no_unhandled_cfa): Handle
	REG_CFA_TOGGLE_RA_MANGLE.
	* dwarf2cfi.c (dwarf2out_frame_debug): Handle REG_CFA_TOGGLE_RA_MANGLE.
	* config/aarch64/aarch64.c (aarch64_expand_prologue): Generates DWARF
	info for return address signing.
	(aarch64_expand_epilogue): Likewise.

From-SVN: r244667
This commit is contained in:
Jiong Wang 2017-01-20 00:05:30 +00:00 committed by Jiong Wang
parent db58fd8954
commit 27169e45d4
5 changed files with 28 additions and 2 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2017-01-19 Jiong Wang <jiong.wang@arm.com>
* reg-notes.def (CFA_TOGGLE_RA_MANGLE): New reg-note.
* combine-stack-adj.c (no_unhandled_cfa): Handle
REG_CFA_TOGGLE_RA_MANGLE.
* dwarf2cfi.c (dwarf2out_frame_debug): Handle REG_CFA_TOGGLE_RA_MANGLE.
* config/aarch64/aarch64.c (aarch64_expand_prologue): Generates DWARF
info for return address signing.
(aarch64_expand_epilogue): Likewise.
2017-01-19 Jiong Wang <jiong.wang@arm.com>
* config/aarch64/aarch64-opts.h (aarch64_function_type): New enum.

1
gcc/combine-stack-adj.c
View File

@ -208,6 +208,7 @@ no_unhandled_cfa (rtx_insn *insn)
case REG_CFA_SET_VDRAP:
case REG_CFA_WINDOW_SAVE:
case REG_CFA_FLUSH_QUEUE:
case REG_CFA_TOGGLE_RA_MANGLE:
return false;
}

12
gcc/config/aarch64/aarch64.c
View File

@ -3559,7 +3559,11 @@ aarch64_expand_prologue (void)
/* Sign return address for functions. */
if (aarch64_return_address_signing_enabled ())
emit_insn (gen_pacisp ());
{
insn = emit_insn (gen_pacisp ());
add_reg_note (insn, REG_CFA_TOGGLE_RA_MANGLE, const0_rtx);
RTX_FRAME_RELATED_P (insn) = 1;
}
if (flag_stack_usage_info)
current_function_static_stack_size = frame_size;
@ -3714,7 +3718,11 @@ aarch64_expand_epilogue (bool for_sibcall)
*/
if (aarch64_return_address_signing_enabled ()
&& (for_sibcall || !TARGET_ARMV8_3 || crtl->calls_eh_return))
emit_insn (gen_autisp ());
{
insn = emit_insn (gen_autisp ());
add_reg_note (insn, REG_CFA_TOGGLE_RA_MANGLE, const0_rtx);
RTX_FRAME_RELATED_P (insn) = 1;
}
/* Stack adjustment for exception handler. */
if (crtl->calls_eh_return)

2
gcc/dwarf2cfi.c
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@ -2098,7 +2098,9 @@ dwarf2out_frame_debug (rtx_insn *insn)
handled_one = true;
break;
case REG_CFA_TOGGLE_RA_MANGLE:
case REG_CFA_WINDOW_SAVE:
/* We overload both of these operations onto the same DWARF opcode. */
dwarf2out_frame_debug_cfa_window_save ();
handled_one = true;
break;

5
gcc/reg-notes.def
View File

@ -177,6 +177,11 @@ REG_NOTE (CFA_WINDOW_SAVE)
the rest of the compiler as a CALL_INSN. */
REG_NOTE (CFA_FLUSH_QUEUE)
/* Attached to insns that are RTX_FRAME_RELATED_P, toggling the mangling status
of return address. Currently it's only used by AArch64. The argument is
ignored. */
REG_NOTE (CFA_TOGGLE_RA_MANGLE)
/* Indicates what exception region an INSN belongs in. This is used
to indicate what region to which a call may throw. REGION 0
indicates that a call cannot throw at all. REGION -1 indicates