From: Jiong Wang <jiong.wang@arm.com>
Date: Fri, 20 Jan 2017 00:05:30 +0000 (+0000)
Subject: [AArch64][2/4] Generate dwarf information for -msign-return-address
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=27169e45d4c16032c2fdee7b89883a1ca62b2b93;p=gcc.git

[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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1f959bb8899..2abfea0f03e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -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.
diff --git a/gcc/combine-stack-adj.c b/gcc/combine-stack-adj.c
index 20cd59ad083..9ec14a3e443 100644
--- a/gcc/combine-stack-adj.c
+++ b/gcc/combine-stack-adj.c
@@ -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;
       }
 
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 62baf584994..c3992d8aceb 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -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)
diff --git a/gcc/dwarf2cfi.c b/gcc/dwarf2cfi.c
index 2748e2fa48e..2a527c9feca 100644
--- a/gcc/dwarf2cfi.c
+++ b/gcc/dwarf2cfi.c
@@ -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;
diff --git a/gcc/reg-notes.def b/gcc/reg-notes.def
index ead4a9f58e8..175da119b6a 100644
--- a/gcc/reg-notes.def
+++ b/gcc/reg-notes.def
@@ -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