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 // See ../runtime/sys_linux_386.s for the reason why we always use int 0x80 16 // instead of the glibc-specific "CALL 0x10(GS)". 17 #define INVOKE_SYSCALL INT $0x80 18 19 TEXT Syscall(SB),NOSPLIT,$0-28 20 CALL runtimeentersyscall(SB) 21 MOVL trap+0(FP), AX // syscall entry 22 MOVL a1+4(FP), BX 23 MOVL a2+8(FP), CX 24 MOVL a3+12(FP), DX 25 MOVL $0, SI 26 MOVL $0, DI 27 INVOKE_SYSCALL 28 CMPL AX, $0xfffff001 29 JLS ok 30 MOVL $-1, r1+16(FP) 31 MOVL $0, r2+20(FP) 32 NEGL AX 33 MOVL AX, err+24(FP) 34 CALL runtimeexitsyscall(SB) 35 RET 36 ok: 37 MOVL AX, r1+16(FP) 38 MOVL DX, r2+20(FP) 39 MOVL $0, err+24(FP) 40 CALL runtimeexitsyscall(SB) 41 RET 42 43 // func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); 44 TEXT Syscall6(SB),NOSPLIT,$0-40 45 CALL runtimeentersyscall(SB) 46 MOVL trap+0(FP), AX // syscall entry 47 MOVL a1+4(FP), BX 48 MOVL a2+8(FP), CX 49 MOVL a3+12(FP), DX 50 MOVL a4+16(FP), SI 51 MOVL a5+20(FP), DI 52 MOVL a6+24(FP), BP 53 INVOKE_SYSCALL 54 CMPL AX, $0xfffff001 55 JLS ok6 56 MOVL $-1, r1+28(FP) 57 MOVL $0, r2+32(FP) 58 NEGL AX 59 MOVL AX, err+36(FP) 60 CALL runtimeexitsyscall(SB) 61 RET 62 ok6: 63 MOVL AX, r1+28(FP) 64 MOVL DX, r2+32(FP) 65 MOVL $0, err+36(FP) 66 CALL runtimeexitsyscall(SB) 67 RET 68 69 // func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); 70 TEXT RawSyscall(SB),NOSPLIT,$0-28 71 MOVL trap+0(FP), AX // syscall entry 72 MOVL a1+4(FP), BX 73 MOVL a2+8(FP), CX 74 MOVL a3+12(FP), DX 75 MOVL $0, SI 76 MOVL $0, DI 77 INVOKE_SYSCALL 78 CMPL AX, $0xfffff001 79 JLS ok1 80 MOVL $-1, r1+16(FP) 81 MOVL $0, r2+20(FP) 82 NEGL AX 83 MOVL AX, err+24(FP) 84 RET 85 ok1: 86 MOVL AX, r1+16(FP) 87 MOVL DX, r2+20(FP) 88 MOVL $0, err+24(FP) 89 RET 90 91 // func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); 92 TEXT RawSyscall6(SB),NOSPLIT,$0-40 93 MOVL trap+0(FP), AX // syscall entry 94 MOVL a1+4(FP), BX 95 MOVL a2+8(FP), CX 96 MOVL a3+12(FP), DX 97 MOVL a4+16(FP), SI 98 MOVL a5+20(FP), DI 99 MOVL a6+24(FP), BP 100 INVOKE_SYSCALL 101 CMPL AX, $0xfffff001 102 JLS ok2 103 MOVL $-1, r1+28(FP) 104 MOVL $0, r2+32(FP) 105 NEGL AX 106 MOVL AX, err+36(FP) 107 RET 108 ok2: 109 MOVL AX, r1+28(FP) 110 MOVL DX, r2+32(FP) 111 MOVL $0, err+36(FP) 112 RET 113 114 #define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */ 115 116 // func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) 117 // Kernel interface gets call sub-number and pointer to a0. 118 TEXT socketcall(SB),NOSPLIT,$0-36 119 CALL runtimeentersyscall(SB) 120 MOVL $SYS_SOCKETCALL, AX // syscall entry 121 MOVL call+0(FP), BX // socket call number 122 LEAL a0+4(FP), CX // pointer to call arguments 123 MOVL $0, DX 124 MOVL $0, SI 125 MOVL $0, DI 126 INVOKE_SYSCALL 127 CMPL AX, $0xfffff001 128 JLS oksock 129 MOVL $-1, n+28(FP) 130 NEGL AX 131 MOVL AX, err+32(FP) 132 CALL runtimeexitsyscall(SB) 133 RET 134 oksock: 135 MOVL AX, n+28(FP) 136 MOVL $0, err+32(FP) 137 CALL runtimeexitsyscall(SB) 138 RET 139 140 // func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) 141 // Kernel interface gets call sub-number and pointer to a0. 142 TEXT rawsocketcall(SB),NOSPLIT,$0-36 143 MOVL $SYS_SOCKETCALL, AX // syscall entry 144 MOVL call+0(FP), BX // socket call number 145 LEAL a0+4(FP), CX // pointer to call arguments 146 MOVL $0, DX 147 MOVL $0, SI 148 MOVL $0, DI 149 INVOKE_SYSCALL 150 CMPL AX, $0xfffff001 151 JLS oksock1 152 MOVL $-1, n+28(FP) 153 NEGL AX 154 MOVL AX, err+32(FP) 155 RET 156 oksock1: 157 MOVL AX, n+28(FP) 158 MOVL $0, err+32(FP) 159 RET 160 161 #define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */ 162 // func Seek(fd int, offset int64, whence int) (newoffset int64, err int) 163 // Implemented in assembly to avoid allocation when 164 // taking the address of the return value newoffset. 165 // Underlying system call is 166 // llseek(int fd, int offhi, int offlo, int64 *result, int whence) 167 TEXT seek(SB),NOSPLIT,$0-28 168 CALL runtimeentersyscall(SB) 169 MOVL $SYS__LLSEEK, AX // syscall entry 170 MOVL fd+0(FP), BX 171 MOVL offset_hi+8(FP), CX 172 MOVL offset_lo+4(FP), DX 173 LEAL newoffset_lo+16(FP), SI // result pointer 174 MOVL whence+12(FP), DI 175 INVOKE_SYSCALL 176 CMPL AX, $0xfffff001 177 JLS okseek 178 MOVL $-1, newoffset_lo+16(FP) 179 MOVL $-1, newoffset_hi+20(FP) 180 NEGL AX 181 MOVL AX, err+24(FP) 182 CALL runtimeexitsyscall(SB) 183 RET 184 okseek: 185 // system call filled in newoffset already 186 MOVL $0, err+24(FP) 187 CALL runtimeexitsyscall(SB) 188 RET 189
