| // 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 rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr) | |
| TEXT 路rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48 | |
| MOVQ a1+8(FP), DI | |
| MOVQ a2+16(FP), SI | |
| MOVQ a3+24(FP), 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+32(FP) | |
| NEGQ AX | |
| MOVQ AX, err+40(FP) | |
| RET | |
| ok2: | |
| MOVQ AX, r1+32(FP) | |
| MOVQ $0, err+40(FP) | |
| RET | |
| // func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr) | |
| TEXT 路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 路gettimeofday(SB),NOSPLIT,$0-16 | |
| // Usually, we'd check if we're running | |
| // secret code here, but because we execute | |
| // gettimeofday on the G stack, it's fine to leave | |
| // the registers uncleared | |
| MOVQ tv+0(FP), DI | |
| MOVQ $0, SI | |
| MOVQ runtime路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 | |