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// 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|NOFRAME,$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