ref: 8f0a2b6431382733d8289d2571a8735ea9d7213a
parent: 9168c60d542e2ee877a7d9ccfaf88593b936bd3f
author: Ori Bernstein <[email protected]>
date: Fri Dec 26 20:19:39 EST 2014
Fix the register saving dance.
Bah, ?l on plan9 want balanced push/pop, so we have to
fool it with add/sub. This is ugly.
--- a/libstd/util+plan9-x64.s
+++ b/libstd/util+plan9-x64.s
@@ -10,13 +10,14 @@
*/
TEXT sys$cstring+0(SB),$0
/* save registers */
- MOVQ SP,BP
+ MOVQ SP,AX
SUBQ $40,SP
- MOVQ BP,-8(BP)
- MOVQ R15,-16(BP)
- MOVQ SI,-24(BP)
- MOVQ DI,-32(BP)
- MOVQ CX,-40(BP)
+ MOVQ BP,-8(AX)
+ MOVQ R15,-16(AX)
+ MOVQ SI,-24(AX)
+ MOVQ DI,-32(AX)
+ MOVQ CX,-40(AX)
+ MOVQ AX,BP
MOVQ (BP),R15 /* ret addr */
MOVQ 8(BP),SI /* src */
@@ -26,8 +27,8 @@
SUBQ $1,SP /* +1 for nul */
MOVQ SP,DI /* dest */
MOVQ SP,AX /* ret val */
- SUBQ $24,SP /* "unpop" the args and make room for return addr */
ANDQ $(~15),SP /* align */
+ SUBQ $24,SP /* "unpop" the args and make room for return addr */
CLD
REP
@@ -45,11 +46,12 @@
TEXT sys$alloca+0(SB),$0
/* save registers */
- MOVQ SP,BP
+ MOVQ SP,AX
SUBQ $32,SP
- MOVQ BP,-8(BP)
- MOVQ R15,-16(BP)
- MOVQ BX,-24(SP)
+ MOVQ BP,-8(AX)
+ MOVQ R15,-16(AX)
+ MOVQ BX,-24(AX)
+ MOVQ AX,BP
MOVQ (BP),R15 /* ret addr */
MOVQ 8(BP),BX /* len */
@@ -57,7 +59,7 @@
/* get stack space */
SUBQ BX,SP /* get stack space */
MOVQ SP,AX /* top of stack (return value) */
- SUBQ $24,SP /* "unpop" the args for return, and reserve ret addr */
+ SUBQ $24,SP /* "unpop" the args, and make room for ret addr */
ANDQ $(~15),SP /* align */
MOVQ R15,0(SP) /* place ret addr */