cmd/internal/obj: use REGENTRYTMP* in a few more places

There are a few remaining places in obj6 where we hard-code
safe-on-entry registers. Fix those to use the consts.

For #40724.

Change-Id: Ie640521aa67d6c99bc057553dc122160049c6edc
Reviewed-on: https://go-review.googlesource.com/c/go/+/307009
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

diff --git a/src/cmd/internal/obj/x86/obj6.go b/src/cmd/internal/obj/x86/obj6.go
index a314583e49a7e604bc258d060cdc264f1495fefc..785e6f5bd375a7cf95abde037f00023d9dd83c1c 100644 (file)
--- a/src/cmd/internal/obj/x86/obj6.go
+++ b/src/cmd/internal/obj/x86/obj6.go
@@ -1046,7 +1046,7 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
                tmp := int16(REG_AX) // use AX for 32-bit
                if ctxt.Arch.Family == sys.AMD64 {
                        // for 64-bit, stay away from register ABI parameter registers, even w/o GOEXPERIMENT=regabi
-                       tmp = int16(REG_R13)
+                       tmp = int16(REGENTRYTMP0)
                }
                // large stack: SP-framesize <= stackguard-StackSmall
                //      LEAQ -xxx(SP), tmp
@@ -1076,8 +1076,8 @@ func stacksplit(ctxt *obj.Link, cursym *obj.LSym, p *obj.Prog, newprog obj.ProgA
                tmp1 := int16(REG_SI)
                tmp2 := int16(REG_AX)
                if ctxt.Arch.Family == sys.AMD64 {
-                       tmp1 = int16(REG_R13) // register ABI uses REG_SI and REG_AX for parameters.
-                       tmp2 = int16(REG_R12)
+                       tmp1 = int16(REGENTRYTMP0) // register ABI uses REG_SI and REG_AX for parameters.
+                       tmp2 = int16(REGENTRYTMP1)
                }
                // Such a large stack we need to protect against wraparound.
                // If SP is close to zero: