diff options
Diffstat (limited to 'src/syscall/asm_linux_amd64.s')
| -rw-r--r-- | src/syscall/asm_linux_amd64.s | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_amd64.s b/src/syscall/asm_linux_amd64.s new file mode 100644 index 0000000..ba22179 --- /dev/null +++ b/src/syscall/asm_linux_amd64.s @@ -0,0 +1,164 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "textflag.h" +#include "funcdata.h" + +// +// System calls for AMD64, Linux +// + +#define SYS_gettimeofday 96 + +// func Syscall(trap int64, a1, a2, a3 uintptr) (r1, r2, err uintptr); +// 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. + +TEXT ·Syscall(SB),NOSPLIT,$0-56 + CALL runtime·entersyscall(SB) + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ trap+0(FP), AX // syscall entry + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok + MOVQ $-1, r1+32(FP) + MOVQ $0, r2+40(FP) + NEGQ AX + MOVQ AX, err+48(FP) + CALL runtime·exitsyscall(SB) + RET +ok: + MOVQ AX, r1+32(FP) + MOVQ DX, r2+40(FP) + MOVQ $0, err+48(FP) + CALL runtime·exitsyscall(SB) + RET + +// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) +TEXT ·Syscall6(SB),NOSPLIT,$0-80 + CALL runtime·entersyscall(SB) + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ a4+32(FP), R10 + MOVQ a5+40(FP), R8 + MOVQ a6+48(FP), R9 + MOVQ trap+0(FP), AX // syscall entry + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok6 + MOVQ $-1, r1+56(FP) + MOVQ $0, r2+64(FP) + NEGQ AX + MOVQ AX, err+72(FP) + CALL runtime·exitsyscall(SB) + RET +ok6: + MOVQ AX, r1+56(FP) + MOVQ DX, r2+64(FP) + MOVQ $0, err+72(FP) + CALL runtime·exitsyscall(SB) + RET + +// func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) +TEXT ·RawSyscall(SB),NOSPLIT,$0-56 + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ trap+0(FP), AX // syscall entry + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok1 + MOVQ $-1, r1+32(FP) + MOVQ $0, r2+40(FP) + NEGQ AX + MOVQ AX, err+48(FP) + RET +ok1: + MOVQ AX, r1+32(FP) + MOVQ DX, r2+40(FP) + MOVQ $0, err+48(FP) + RET + +// func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) +TEXT ·RawSyscall6(SB),NOSPLIT,$0-80 + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ a4+32(FP), R10 + MOVQ a5+40(FP), R8 + MOVQ a6+48(FP), R9 + MOVQ trap+0(FP), AX // syscall entry + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok2 + MOVQ $-1, r1+56(FP) + MOVQ $0, r2+64(FP) + NEGQ AX + MOVQ AX, err+72(FP) + RET +ok2: + MOVQ AX, r1+56(FP) + MOVQ DX, r2+64(FP) + MOVQ $0, err+72(FP) + RET + +// func rawVforkSyscall(trap, a1 uintptr) (r1, err uintptr) +TEXT ·rawVforkSyscall(SB),NOSPLIT,$0-32 + MOVQ a1+8(FP), DI + MOVQ $0, SI + MOVQ $0, DX + MOVQ $0, R10 + MOVQ $0, R8 + MOVQ $0, R9 + MOVQ trap+0(FP), AX // syscall entry + POPQ R12 // preserve return address + SYSCALL + PUSHQ R12 + CMPQ AX, $0xfffffffffffff001 + JLS ok2 + MOVQ $-1, r1+16(FP) + NEGQ AX + MOVQ AX, err+24(FP) + RET +ok2: + MOVQ AX, r1+16(FP) + MOVQ $0, err+24(FP) + RET + +// func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr) +TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48 + MOVQ a1+8(FP), DI + MOVQ a2+16(FP), SI + MOVQ a3+24(FP), DX + MOVQ trap+0(FP), AX // syscall entry + SYSCALL + MOVQ AX, r1+32(FP) + MOVQ DX, r2+40(FP) + RET + +// func gettimeofday(tv *Timeval) (err uintptr) +TEXT ·gettimeofday(SB),NOSPLIT,$0-16 + MOVQ tv+0(FP), DI + MOVQ $0, SI + MOVQ runtime·vdsoGettimeofdaySym(SB), AX + TESTQ AX, AX + JZ fallback + CALL AX +ret: + CMPQ AX, $0xfffffffffffff001 + JLS ok7 + NEGQ AX + MOVQ AX, err+8(FP) + RET +fallback: + MOVL $SYS_gettimeofday, AX + SYSCALL + JMP ret +ok7: + MOVQ $0, err+8(FP) + RET |