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i386 return address patch
- To: kenner at gnu dot ai dot mit dot edu, egcs at cygnus dot com, libc-hacker at gnu dot ai dot mit dot edu
- Subject: i386 return address patch
- From: Richard Henderson <rth at cygnus dot com>
- Date: Tue, 30 Sep 1997 11:08:47 -0700 (PDT)
Tue Sep 30 11:05:47 1997 Richard Henderson <rth@cygnus.com>
* i386.h (RETURN_ADDR_RTX): New definition that works for
__builtin_return_address(0) and -fomit-frame-pointer.
--- config/i386/i386.h.orig Thu Jul 31 13:26:06 1997
+++ config/i386/i386.h Tue Sep 30 11:02:40 1997
@@ -2366,6 +2366,12 @@ number as al, and ax.
#define INCOMING_RETURN_ADDR_RTX \
gen_rtx (MEM, VOIDmode, gen_rtx (REG, VOIDmode, STACK_POINTER_REGNUM))
+/* After the prologue, RA is at -4(AP) in the current frame. */
+#define RETURN_ADDR_RTX(COUNT, FRAME) \
+ ((COUNT) == 0 \
+ ? gen_rtx (MEM, Pmode, gen_rtx (PLUS, Pmode, arg_pointer_rtx, GEN_INT(-4)))\
+ : gen_rtx (MEM, Pmode, gen_rtx (PLUS, Pmode, (FRAME), GEN_INT(4))))
+
/* PC is dbx register 8; let's use that column for RA. */
#define DWARF_FRAME_RETURN_COLUMN 8