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go.sys/unix: just jump to syscall.Syscall etc.

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Don't re-implement these functions.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/124390043
This commit is contained in:
Rob Pike
2014-08-14 12:30:17 -07:00
parent ba5045e1e0
commit aec3c6a331
15 changed files with 109 additions and 1780 deletions
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unix/asm_linux_amd64.s
+7 -106
View File
@@ -2,125 +2,26 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
// so that go vet can check that they are correct.
#include "textflag.h"
//
// System calls for AMD64, Linux
//
// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
// Trap # in AX, args in DI SI DX R10 R8 R9, return in AX DX
// Note that this differs from "standard" ABI convention, which
// would pass 4th arg in CX, not R10.
// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.
TEXT ·Syscall(SB),NOSPLIT,$0-56
CALL runtime·entersyscall(SB)
MOVQ 16(SP), DI
MOVQ 24(SP), SI
MOVQ 32(SP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ 8(SP), AX // syscall entry
SYSCALL
CMPQ AX, $0xfffffffffffff001
JLS ok
MOVQ $-1, 40(SP) // r1
MOVQ $0, 48(SP) // r2
NEGQ AX
MOVQ AX, 56(SP) // errno
CALL runtime·exitsyscall(SB)
RET
ok:
MOVQ AX, 40(SP) // r1
MOVQ DX, 48(SP) // r2
MOVQ $0, 56(SP) // errno
CALL runtime·exitsyscall(SB)
RET
JMP syscall·Syscall(SB)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
CALL runtime·entersyscall(SB)
MOVQ 16(SP), DI
MOVQ 24(SP), SI
MOVQ 32(SP), DX
MOVQ 40(SP), R10
MOVQ 48(SP), R8
MOVQ 56(SP), R9
MOVQ 8(SP), AX // syscall entry
SYSCALL
CMPQ AX, $0xfffffffffffff001
JLS ok6
MOVQ $-1, 64(SP) // r1
MOVQ $0, 72(SP) // r2
NEGQ AX
MOVQ AX, 80(SP) // errno
CALL runtime·exitsyscall(SB)
RET
ok6:
MOVQ AX, 64(SP) // r1
MOVQ DX, 72(SP) // r2
MOVQ $0, 80(SP) // errno
CALL runtime·exitsyscall(SB)
RET
JMP syscall·Syscall6(SB)
TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ 16(SP), DI
MOVQ 24(SP), SI
MOVQ 32(SP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ 8(SP), AX // syscall entry
SYSCALL
CMPQ AX, $0xfffffffffffff001
JLS ok1
MOVQ $-1, 40(SP) // r1
MOVQ $0, 48(SP) // r2
NEGQ AX
MOVQ AX, 56(SP) // errno
RET
ok1:
MOVQ AX, 40(SP) // r1
MOVQ DX, 48(SP) // r2
MOVQ $0, 56(SP) // errno
RET
JMP syscall·RawSyscall(SB)
TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
MOVQ 16(SP), DI
MOVQ 24(SP), SI
MOVQ 32(SP), DX
MOVQ 40(SP), R10
MOVQ 48(SP), R8
MOVQ 56(SP), R9
MOVQ 8(SP), AX // syscall entry
SYSCALL
CMPQ AX, $0xfffffffffffff001
JLS ok2
MOVQ $-1, 64(SP) // r1
MOVQ $0, 72(SP) // r2
NEGQ AX
MOVQ AX, 80(SP) // errno
RET
ok2:
MOVQ AX, 64(SP) // r1
MOVQ DX, 72(SP) // r2
MOVQ $0, 80(SP) // errno
RET
JMP syscall·RawSyscall6(SB)
TEXT ·gettimeofday(SB),NOSPLIT,$0-16
MOVQ 8(SP), DI
MOVQ $0, SI
MOVQ runtime·__vdso_gettimeofday_sym(SB), AX
CALL AX
CMPQ AX, $0xfffffffffffff001
JLS ok7
NEGQ AX
MOVQ AX, 16(SP) // errno
RET
ok7:
MOVQ $0, 16(SP) // errno
RET
JMP syscall·gettimeofday(SB)