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 386, Linux 10 // 11 12 // func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); 13 // Trap # in AX, args in BX CX DX SI DI, return in AX 14 15 TEXT Syscall(SB),NOSPLIT,$0-28 16 CALL runtimeentersyscall(SB) 17 MOVL trap+0(FP), AX // syscall entry 18 MOVL a1+4(FP), BX 19 MOVL a2+8(FP), CX 20 MOVL a3+12(FP), DX 21 MOVL $0, SI 22 MOVL $0, DI 23 CALL *runtime_vdso(SB) 24 CMPL AX, $0xfffff001 25 JLS ok 26 MOVL $-1, r1+16(FP) 27 MOVL $0, r2+20(FP) 28 NEGL AX 29 MOVL AX, err+24(FP) 30 CALL runtimeexitsyscall(SB) 31 RET 32 ok: 33 MOVL AX, r1+16(FP) 34 MOVL DX, r2+20(FP) 35 MOVL $0, err+24(FP) 36 CALL runtimeexitsyscall(SB) 37 RET 38 39 // func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); 40 TEXT Syscall6(SB),NOSPLIT,$0-40 41 CALL runtimeentersyscall(SB) 42 MOVL trap+0(FP), AX // syscall entry 43 MOVL a1+4(FP), BX 44 MOVL a2+8(FP), CX 45 MOVL a3+12(FP), DX 46 MOVL a4+16(FP), SI 47 MOVL a5+20(FP), DI 48 MOVL a6+24(FP), BP 49 CALL *runtime_vdso(SB) 50 CMPL AX, $0xfffff001 51 JLS ok6 52 MOVL $-1, r1+28(FP) 53 MOVL $0, r2+32(FP) 54 NEGL AX 55 MOVL AX, err+36(FP) 56 CALL runtimeexitsyscall(SB) 57 RET 58 ok6: 59 MOVL AX, r1+28(FP) 60 MOVL DX, r2+32(FP) 61 MOVL $0, err+36(FP) 62 CALL runtimeexitsyscall(SB) 63 RET 64 65 // func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); 66 TEXT RawSyscall(SB),NOSPLIT,$0-28 67 MOVL trap+0(FP), AX // syscall entry 68 MOVL a1+4(FP), BX 69 MOVL a2+8(FP), CX 70 MOVL a3+12(FP), DX 71 MOVL $0, SI 72 MOVL $0, DI 73 CALL *runtime_vdso(SB) 74 CMPL AX, $0xfffff001 75 JLS ok1 76 MOVL $-1, r1+16(FP) 77 MOVL $0, r2+20(FP) 78 NEGL AX 79 MOVL AX, err+24(FP) 80 RET 81 ok1: 82 MOVL AX, r1+16(FP) 83 MOVL DX, r2+20(FP) 84 MOVL $0, err+24(FP) 85 RET 86 87 // func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); 88 TEXT RawSyscall6(SB),NOSPLIT,$0-40 89 MOVL trap+0(FP), AX // syscall entry 90 MOVL a1+4(FP), BX 91 MOVL a2+8(FP), CX 92 MOVL a3+12(FP), DX 93 MOVL a4+16(FP), SI 94 MOVL a5+20(FP), DI 95 MOVL a6+24(FP), BP 96 CALL *runtime_vdso(SB) 97 CMPL AX, $0xfffff001 98 JLS ok2 99 MOVL $-1, r1+28(FP) 100 MOVL $0, r2+32(FP) 101 NEGL AX 102 MOVL AX, err+36(FP) 103 RET 104 ok2: 105 MOVL AX, r1+28(FP) 106 MOVL DX, r2+32(FP) 107 MOVL $0, err+36(FP) 108 RET 109 110 #define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */ 111 112 // func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) 113 // Kernel interface gets call sub-number and pointer to a0. 114 TEXT socketcall(SB),NOSPLIT,$0-36 115 CALL runtimeentersyscall(SB) 116 MOVL $SYS_SOCKETCALL, AX // syscall entry 117 MOVL call+0(FP), BX // socket call number 118 LEAL a0+4(FP), CX // pointer to call arguments 119 MOVL $0, DX 120 MOVL $0, SI 121 MOVL $0, DI 122 CALL *runtime_vdso(SB) 123 CMPL AX, $0xfffff001 124 JLS oksock 125 MOVL $-1, n+28(FP) 126 NEGL AX 127 MOVL AX, err+32(FP) 128 CALL runtimeexitsyscall(SB) 129 RET 130 oksock: 131 MOVL AX, n+28(FP) 132 MOVL $0, err+32(FP) 133 CALL runtimeexitsyscall(SB) 134 RET 135 136 // func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) 137 // Kernel interface gets call sub-number and pointer to a0. 138 TEXT rawsocketcall(SB),NOSPLIT,$0-36 139 MOVL $SYS_SOCKETCALL, AX // syscall entry 140 MOVL call+0(FP), BX // socket call number 141 LEAL a0+4(FP), CX // pointer to call arguments 142 MOVL $0, DX 143 MOVL $0, SI 144 MOVL $0, DI 145 CALL *runtime_vdso(SB) 146 CMPL AX, $0xfffff001 147 JLS oksock1 148 MOVL $-1, n+28(FP) 149 NEGL AX 150 MOVL AX, err+32(FP) 151 RET 152 oksock1: 153 MOVL AX, n+28(FP) 154 MOVL $0, err+32(FP) 155 RET 156 157 #define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */ 158 // func Seek(fd int, offset int64, whence int) (newoffset int64, err int) 159 // Implemented in assembly to avoid allocation when 160 // taking the address of the return value newoffset. 161 // Underlying system call is 162 // llseek(int fd, int offhi, int offlo, int64 *result, int whence) 163 TEXT seek(SB),NOSPLIT,$0-28 164 CALL runtimeentersyscall(SB) 165 MOVL $SYS__LLSEEK, AX // syscall entry 166 MOVL fd+0(FP), BX 167 MOVL offset_hi+8(FP), CX 168 MOVL offset_lo+4(FP), DX 169 LEAL newoffset_lo+16(FP), SI // result pointer 170 MOVL whence+12(FP), DI 171 CALL *runtime_vdso(SB) 172 CMPL AX, $0xfffff001 173 JLS okseek 174 MOVL $-1, newoffset_lo+16(FP) 175 MOVL $-1, newoffset_hi+20(FP) 176 NEGL AX 177 MOVL AX, err+24(FP) 178 CALL runtimeexitsyscall(SB) 179 RET 180 okseek: 181 // system call filled in newoffset already 182 MOVL $0, err+24(FP) 183 CALL runtimeexitsyscall(SB) 184 RET 185
