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 386, FreeBSD 13 // 14 15 // func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32); 16 // func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32); 17 // Trap # in AX, args on stack above caller pc. 18 19 TEXT Syscall(SB),NOSPLIT,$0-28 20 CALL runtimeentersyscall(SB) 21 MOVL 4(SP), AX // syscall entry 22 // slide args down on top of system call number 23 LEAL 8(SP), SI 24 LEAL 4(SP), DI 25 CLD 26 MOVSL 27 MOVSL 28 MOVSL 29 INT $0x80 30 JAE ok 31 MOVL $-1, 20(SP) // r1 32 MOVL $-1, 24(SP) // r2 33 MOVL AX, 28(SP) // errno 34 CALL runtimeexitsyscall(SB) 35 RET 36 ok: 37 MOVL AX, 20(SP) // r1 38 MOVL DX, 24(SP) // r2 39 MOVL $0, 28(SP) // errno 40 CALL runtimeexitsyscall(SB) 41 RET 42 43 TEXT Syscall6(SB),NOSPLIT,$0-40 44 CALL runtimeentersyscall(SB) 45 MOVL 4(SP), AX // syscall entry 46 // slide args down on top of system call number 47 LEAL 8(SP), SI 48 LEAL 4(SP), DI 49 CLD 50 MOVSL 51 MOVSL 52 MOVSL 53 MOVSL 54 MOVSL 55 MOVSL 56 INT $0x80 57 JAE ok6 58 MOVL $-1, 32(SP) // r1 59 MOVL $-1, 36(SP) // r2 60 MOVL AX, 40(SP) // errno 61 CALL runtimeexitsyscall(SB) 62 RET 63 ok6: 64 MOVL AX, 32(SP) // r1 65 MOVL DX, 36(SP) // r2 66 MOVL $0, 40(SP) // errno 67 CALL runtimeexitsyscall(SB) 68 RET 69 70 TEXT Syscall9(SB),NOSPLIT,$0-52 71 CALL runtimeentersyscall(SB) 72 MOVL 4(SP), AX // syscall entry 73 // slide args down on top of system call number 74 LEAL 8(SP), SI 75 LEAL 4(SP), DI 76 CLD 77 MOVSL 78 MOVSL 79 MOVSL 80 MOVSL 81 MOVSL 82 MOVSL 83 MOVSL 84 MOVSL 85 MOVSL 86 INT $0x80 87 JAE ok9 88 MOVL $-1, 44(SP) // r1 89 MOVL $-1, 48(SP) // r2 90 MOVL AX, 52(SP) // errno 91 CALL runtimeexitsyscall(SB) 92 RET 93 ok9: 94 MOVL AX, 44(SP) // r1 95 MOVL DX, 48(SP) // r2 96 MOVL $0, 52(SP) // errno 97 CALL runtimeexitsyscall(SB) 98 RET 99 100 TEXT RawSyscall(SB),NOSPLIT,$0-28 101 MOVL 4(SP), AX // syscall entry 102 // slide args down on top of system call number 103 LEAL 8(SP), SI 104 LEAL 4(SP), DI 105 CLD 106 MOVSL 107 MOVSL 108 MOVSL 109 INT $0x80 110 JAE ok1 111 MOVL $-1, 20(SP) // r1 112 MOVL $-1, 24(SP) // r2 113 MOVL AX, 28(SP) // errno 114 RET 115 ok1: 116 MOVL AX, 20(SP) // r1 117 MOVL DX, 24(SP) // r2 118 MOVL $0, 28(SP) // errno 119 RET 120 121 TEXT RawSyscall6(SB),NOSPLIT,$0-40 122 MOVL 4(SP), AX // syscall entry 123 // slide args down on top of system call number 124 LEAL 8(SP), SI 125 LEAL 4(SP), DI 126 CLD 127 MOVSL 128 MOVSL 129 MOVSL 130 MOVSL 131 MOVSL 132 MOVSL 133 INT $0x80 134 JAE ok2 135 MOVL $-1, 32(SP) // r1 136 MOVL $-1, 36(SP) // r2 137 MOVL AX, 40(SP) // errno 138 RET 139 ok2: 140 MOVL AX, 32(SP) // r1 141 MOVL DX, 36(SP) // r2 142 MOVL $0, 40(SP) // errno 143 RET 144
