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, FreeBSD 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 16(SP), DI 23 MOVQ 24(SP), SI 24 MOVQ 32(SP), DX 25 MOVQ $0, R10 26 MOVQ $0, R8 27 MOVQ $0, R9 28 MOVQ 8(SP), AX // syscall entry 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 16(SP), DI 46 MOVQ 24(SP), SI 47 MOVQ 32(SP), DX 48 MOVQ 40(SP), R10 49 MOVQ 48(SP), R8 50 MOVQ 56(SP), R9 51 MOVQ 8(SP), AX // syscall entry 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 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 76 // shift around the last three arguments so they're at the 77 // top of the stack when the syscall is called. 78 MOVQ 64(SP), R11 // arg 7 79 MOVQ R11, 8(SP) 80 MOVQ 72(SP), R11 // arg 8 81 MOVQ R11, 16(SP) 82 MOVQ 80(SP), R11 // arg 9 83 MOVQ R11, 24(SP) 84 85 SYSCALL 86 JCC ok9 87 MOVQ $-1, 88(SP) // r1 88 MOVQ $0, 96(SP) // r2 89 MOVQ AX, 104(SP) // errno 90 CALL runtimeexitsyscall(SB) 91 RET 92 ok9: 93 MOVQ AX, 88(SP) // r1 94 MOVQ DX, 96(SP) // r2 95 MOVQ $0, 104(SP) // errno 96 CALL runtimeexitsyscall(SB) 97 RET 98 99 TEXT RawSyscall(SB),NOSPLIT,$0-56 100 MOVQ 16(SP), DI 101 MOVQ 24(SP), SI 102 MOVQ 32(SP), DX 103 MOVQ $0, R10 104 MOVQ $0, R8 105 MOVQ $0, R9 106 MOVQ 8(SP), AX // syscall entry 107 SYSCALL 108 JCC ok1 109 MOVQ $-1, 40(SP) // r1 110 MOVQ $0, 48(SP) // r2 111 MOVQ AX, 56(SP) // errno 112 RET 113 ok1: 114 MOVQ AX, 40(SP) // r1 115 MOVQ DX, 48(SP) // r2 116 MOVQ $0, 56(SP) // errno 117 RET 118 119 TEXT RawSyscall6(SB),NOSPLIT,$0-80 120 MOVQ 16(SP), DI 121 MOVQ 24(SP), SI 122 MOVQ 32(SP), DX 123 MOVQ 40(SP), R10 124 MOVQ 48(SP), R8 125 MOVQ 56(SP), R9 126 MOVQ 8(SP), AX // syscall entry 127 SYSCALL 128 JCC ok2 129 MOVQ $-1, 64(SP) // r1 130 MOVQ $0, 72(SP) // r2 131 MOVQ AX, 80(SP) // errno 132 RET 133 ok2: 134 MOVQ AX, 64(SP) // r1 135 MOVQ DX, 72(SP) // r2 136 MOVQ $0, 80(SP) // errno 137 RET 138
