1 // Copyright 2009 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 #include "funcdata.h" 7 8 // 9 // System calls for AMD64, Linux 10 // 11 12 // func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64); 13 // Trap # in AX, args in DI SI DX R10 R8 R9, return in AX DX 14 // Note that this differs from "standard" ABI convention, which 15 // would pass 4th arg in CX, not R10. 16 17 TEXT Syscall(SB),NOSPLIT,$0-56 18 CALL runtimeentersyscall(SB) 19 MOVQ a1+8(FP), DI 20 MOVQ a2+16(FP), SI 21 MOVQ a3+24(FP), DX 22 MOVQ $0, R10 23 MOVQ $0, R8 24 MOVQ $0, R9 25 MOVQ trap+0(FP), AX // syscall entry 26 SYSCALL 27 CMPQ AX, $0xfffffffffffff001 28 JLS ok 29 MOVQ $-1, r1+32(FP) 30 MOVQ $0, r2+40(FP) 31 NEGQ AX 32 MOVQ AX, err+48(FP) 33 CALL runtimeexitsyscall(SB) 34 RET 35 ok: 36 MOVQ AX, r1+32(FP) 37 MOVQ DX, r2+40(FP) 38 MOVQ $0, err+48(FP) 39 CALL runtimeexitsyscall(SB) 40 RET 41 42 // func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) 43 TEXT Syscall6(SB),NOSPLIT,$0-80 44 CALL runtimeentersyscall(SB) 45 MOVQ a1+8(FP), DI 46 MOVQ a2+16(FP), SI 47 MOVQ a3+24(FP), DX 48 MOVQ a4+32(FP), R10 49 MOVQ a5+40(FP), R8 50 MOVQ a6+48(FP), R9 51 MOVQ trap+0(FP), AX // syscall entry 52 SYSCALL 53 CMPQ AX, $0xfffffffffffff001 54 JLS ok6 55 MOVQ $-1, r1+56(FP) 56 MOVQ $0, r2+64(FP) 57 NEGQ AX 58 MOVQ AX, err+72(FP) 59 CALL runtimeexitsyscall(SB) 60 RET 61 ok6: 62 MOVQ AX, r1+56(FP) 63 MOVQ DX, r2+64(FP) 64 MOVQ $0, err+72(FP) 65 CALL runtimeexitsyscall(SB) 66 RET 67 68 // func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) 69 TEXT RawSyscall(SB),NOSPLIT,$0-56 70 MOVQ a1+8(FP), DI 71 MOVQ a2+16(FP), SI 72 MOVQ a3+24(FP), DX 73 MOVQ $0, R10 74 MOVQ $0, R8 75 MOVQ $0, R9 76 MOVQ trap+0(FP), AX // syscall entry 77 SYSCALL 78 CMPQ AX, $0xfffffffffffff001 79 JLS ok1 80 MOVQ $-1, r1+32(FP) 81 MOVQ $0, r2+40(FP) 82 NEGQ AX 83 MOVQ AX, err+48(FP) 84 RET 85 ok1: 86 MOVQ AX, r1+32(FP) 87 MOVQ DX, r2+40(FP) 88 MOVQ $0, err+48(FP) 89 RET 90 91 // func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) 92 TEXT RawSyscall6(SB),NOSPLIT,$0-80 93 MOVQ a1+8(FP), DI 94 MOVQ a2+16(FP), SI 95 MOVQ a3+24(FP), DX 96 MOVQ a4+32(FP), R10 97 MOVQ a5+40(FP), R8 98 MOVQ a6+48(FP), R9 99 MOVQ trap+0(FP), AX // syscall entry 100 SYSCALL 101 CMPQ AX, $0xfffffffffffff001 102 JLS ok2 103 MOVQ $-1, r1+56(FP) 104 MOVQ $0, r2+64(FP) 105 NEGQ AX 106 MOVQ AX, err+72(FP) 107 RET 108 ok2: 109 MOVQ AX, r1+56(FP) 110 MOVQ DX, r2+64(FP) 111 MOVQ $0, err+72(FP) 112 RET 113 114 // func rawVforkSyscall(trap, a1 uintptr) (r1, err uintptr) 115 TEXT rawVforkSyscall(SB),NOSPLIT,$0-32 116 MOVQ a1+8(FP), DI 117 MOVQ $0, SI 118 MOVQ $0, DX 119 MOVQ $0, R10 120 MOVQ $0, R8 121 MOVQ $0, R9 122 MOVQ trap+0(FP), AX // syscall entry 123 POPQ R12 // preserve return address 124 SYSCALL 125 PUSHQ R12 126 CMPQ AX, $0xfffffffffffff001 127 JLS ok2 128 MOVQ $-1, r1+16(FP) 129 NEGQ AX 130 MOVQ AX, err+24(FP) 131 RET 132 ok2: 133 MOVQ AX, r1+16(FP) 134 MOVQ $0, err+24(FP) 135 RET 136 137 // func gettimeofday(tv *Timeval) (err uintptr) 138 TEXT gettimeofday(SB),NOSPLIT,$0-16 139 MOVQ tv+0(FP), DI 140 MOVQ $0, SI 141 MOVQ runtime__vdso_gettimeofday_sym(SB), AX 142 CALL AX 143 144 CMPQ AX, $0xfffffffffffff001 145 JLS ok7 146 NEGQ AX 147 MOVQ AX, err+8(FP) 148 RET 149 ok7: 150 MOVQ $0, err+8(FP) 151 RET 152
