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 // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) 6 // so that go vet can check that they are correct. 7 8 #include "textflag.h" 9 #include "funcdata.h" 10 11 // 12 // System call support for AMD64, OpenBSD 13 // 14 15 // func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64); 16 // func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64); 17 // func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64); 18 // Trap # in AX, args in DI SI DX, return in AX DX 19 20 TEXT Syscall(SB),NOSPLIT,$0-56 21 CALL runtimeentersyscall(SB) 22 MOVQ 8(SP), AX // syscall entry 23 MOVQ 16(SP), DI 24 MOVQ 24(SP), SI 25 MOVQ 32(SP), DX 26 MOVQ $0, R10 27 MOVQ $0, R8 28 MOVQ $0, R9 29 SYSCALL 30 JCC ok 31 MOVQ $-1, 40(SP) // r1 32 MOVQ $0, 48(SP) // r2 33 MOVQ AX, 56(SP) // errno 34 CALL runtimeexitsyscall(SB) 35 RET 36 ok: 37 MOVQ AX, 40(SP) // r1 38 MOVQ DX, 48(SP) // r2 39 MOVQ $0, 56(SP) // errno 40 CALL runtimeexitsyscall(SB) 41 RET 42 43 TEXT Syscall6(SB),NOSPLIT,$0-80 44 CALL runtimeentersyscall(SB) 45 MOVQ 8(SP), AX // syscall entry 46 MOVQ 16(SP), DI 47 MOVQ 24(SP), SI 48 MOVQ 32(SP), DX 49 MOVQ 40(SP), R10 50 MOVQ 48(SP), R8 51 MOVQ 56(SP), R9 52 SYSCALL 53 JCC ok6 54 MOVQ $-1, 64(SP) // r1 55 MOVQ $0, 72(SP) // r2 56 MOVQ AX, 80(SP) // errno 57 CALL runtimeexitsyscall(SB) 58 RET 59 ok6: 60 MOVQ AX, 64(SP) // r1 61 MOVQ DX, 72(SP) // r2 62 MOVQ $0, 80(SP) // errno 63 CALL runtimeexitsyscall(SB) 64 RET 65 66 TEXT Syscall9(SB),NOSPLIT,$0-104 67 CALL runtimeentersyscall(SB) 68 MOVQ 8(SP), AX // syscall entry 69 MOVQ 16(SP), DI 70 MOVQ 24(SP), SI 71 MOVQ 32(SP), DX 72 MOVQ 40(SP), R10 73 MOVQ 48(SP), R8 74 MOVQ 56(SP), R9 75 MOVQ 64(SP), R11 76 MOVQ 72(SP), R12 77 MOVQ 80(SP), R13 78 SUBQ $32, SP 79 MOVQ R11, 8(SP) // arg 7 80 MOVQ R12, 16(SP) // arg 8 81 MOVQ R13, 24(SP) // arg 9 82 SYSCALL 83 JCC ok9 84 ADDQ $32, SP 85 MOVQ $-1, 88(SP) // r1 86 MOVQ $0, 96(SP) // r2 87 MOVQ AX, 104(SP) // errno 88 CALL runtimeexitsyscall(SB) 89 RET 90 ok9: 91 ADDQ $32, SP 92 MOVQ AX, 88(SP) // r1 93 MOVQ DX, 96(SP) // r2 94 MOVQ $0, 104(SP) // errno 95 CALL runtimeexitsyscall(SB) 96 RET 97 98 TEXT RawSyscall(SB),NOSPLIT,$0-56 99 MOVQ 16(SP), DI 100 MOVQ 24(SP), SI 101 MOVQ 32(SP), DX 102 MOVQ $0, R10 103 MOVQ $0, R8 104 MOVQ $0, R9 105 MOVQ 8(SP), AX // syscall entry 106 SYSCALL 107 JCC ok1 108 MOVQ $-1, 40(SP) // r1 109 MOVQ $0, 48(SP) // r2 110 MOVQ AX, 56(SP) // errno 111 RET 112 ok1: 113 MOVQ AX, 40(SP) // r1 114 MOVQ DX, 48(SP) // r2 115 MOVQ $0, 56(SP) // errno 116 RET 117 118 TEXT RawSyscall6(SB),NOSPLIT,$0-80 119 MOVQ 16(SP), DI 120 MOVQ 24(SP), SI 121 MOVQ 32(SP), DX 122 MOVQ 40(SP), R10 123 MOVQ 48(SP), R8 124 MOVQ 56(SP), R9 125 MOVQ 8(SP), AX // syscall entry 126 SYSCALL 127 JCC ok2 128 MOVQ $-1, 64(SP) // r1 129 MOVQ $0, 72(SP) // r2 130 MOVQ AX, 80(SP) // errno 131 RET 132 ok2: 133 MOVQ AX, 64(SP) // r1 134 MOVQ DX, 72(SP) // r2 135 MOVQ $0, 80(SP) // errno 136 RET 137
