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syscall: fix arithmetic errors in assembly for seek function for 64-bit Plan 9

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Offsets for return values from seek were miscalculated
and a translation from 32-bit code for error handling
was incorrect.

R=rsc, rminnich, npe
CC=golang-dev
https://golang.org/cl/7181045
This commit is contained in:
Akshat Kumar 2013-01-22 14:03:30 -05:00 committed by Russ Cox
parent f8284b64ce
commit 85f86399f4
1 changed files with 3 additions and 4 deletions
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7
src/pkg/syscall/asm_plan9_amd64.s
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@ -128,7 +128,7 @@ TEXT ·RawSyscall6(SB),7,$0
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT ·seek(SB),7,$0
LEAQ newoffset+48(SP), AX
LEAQ newoffset+40(SP), AX
MOVQ AX, placeholder+8(SP)
MOVQ $0x8000, AX // for NxM
@ -137,8 +137,7 @@ TEXT ·seek(SB),7,$0
CMPQ AX, $-1
JNE ok6
MOVQ AX, 48(SP) // newoffset low
MOVQ AX, 56(SP) // newoffset high
MOVQ AX, 40(SP) // newoffset
SUBQ $16, SP
CALL syscall·errstr(SB)
@ -150,7 +149,7 @@ ok6:
LEAQ runtime·emptystring(SB), SI
copyresult6:
LEAQ err+64(SP), DI
LEAQ err+48(SP), DI
CLD
MOVSQ