diff options
Diffstat (limited to 'src/syscall/asm_linux_386.s')
| -rw-r--r-- | src/syscall/asm_linux_386.s | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_386.s b/src/syscall/asm_linux_386.s new file mode 100644 index 0000000..a8e63f7 --- /dev/null +++ b/src/syscall/asm_linux_386.s @@ -0,0 +1,123 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "textflag.h" +#include "funcdata.h" + +// +// System calls for 386, Linux +// + +// See ../runtime/sys_linux_386.s for the reason why we always use int 0x80 +// instead of the glibc-specific "CALL 0x10(GS)". +#define INVOKE_SYSCALL INT $0x80 + +// func rawVforkSyscall(trap, a1, a2 uintptr) (r1, err uintptr) +TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-20 + MOVL trap+0(FP), AX // syscall entry + MOVL a1+4(FP), BX + MOVL a2+8(FP), CX + MOVL $0, DX + POPL SI // preserve return address + INVOKE_SYSCALL + PUSHL SI + CMPL AX, $0xfffff001 + JLS ok + MOVL $-1, r1+12(FP) + NEGL AX + MOVL AX, err+16(FP) + RET +ok: + MOVL AX, r1+12(FP) + MOVL $0, err+16(FP) + RET + +// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr); +TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24 + MOVL trap+0(FP), AX // syscall entry + MOVL a1+4(FP), BX + MOVL a2+8(FP), CX + MOVL a3+12(FP), DX + MOVL $0, SI + MOVL $0, DI + INVOKE_SYSCALL + MOVL AX, r1+16(FP) + MOVL DX, r2+20(FP) + RET + +#define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */ + +// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) +// Kernel interface gets call sub-number and pointer to a0. +TEXT ·socketcall(SB),NOSPLIT,$0-36 + CALL runtime·entersyscall(SB) + MOVL $SYS_SOCKETCALL, AX // syscall entry + MOVL call+0(FP), BX // socket call number + LEAL a0+4(FP), CX // pointer to call arguments + MOVL $0, DX + MOVL $0, SI + MOVL $0, DI + INVOKE_SYSCALL + CMPL AX, $0xfffff001 + JLS oksock + MOVL $-1, n+28(FP) + NEGL AX + MOVL AX, err+32(FP) + CALL runtime·exitsyscall(SB) + RET +oksock: + MOVL AX, n+28(FP) + MOVL $0, err+32(FP) + CALL runtime·exitsyscall(SB) + RET + +// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int) +// Kernel interface gets call sub-number and pointer to a0. +TEXT ·rawsocketcall(SB),NOSPLIT,$0-36 + MOVL $SYS_SOCKETCALL, AX // syscall entry + MOVL call+0(FP), BX // socket call number + LEAL a0+4(FP), CX // pointer to call arguments + MOVL $0, DX + MOVL $0, SI + MOVL $0, DI + INVOKE_SYSCALL + CMPL AX, $0xfffff001 + JLS oksock1 + MOVL $-1, n+28(FP) + NEGL AX + MOVL AX, err+32(FP) + RET +oksock1: + MOVL AX, n+28(FP) + MOVL $0, err+32(FP) + RET + +#define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */ +// func Seek(fd int, offset int64, whence int) (newoffset int64, err int) +// Implemented in assembly to avoid allocation when +// taking the address of the return value newoffset. +// Underlying system call is +// llseek(int fd, int offhi, int offlo, int64 *result, int whence) +TEXT ·seek(SB),NOSPLIT,$0-28 + CALL runtime·entersyscall(SB) + MOVL $SYS__LLSEEK, AX // syscall entry + MOVL fd+0(FP), BX + MOVL offset_hi+8(FP), CX + MOVL offset_lo+4(FP), DX + LEAL newoffset_lo+16(FP), SI // result pointer + MOVL whence+12(FP), DI + INVOKE_SYSCALL + CMPL AX, $0xfffff001 + JLS okseek + MOVL $-1, newoffset_lo+16(FP) + MOVL $-1, newoffset_hi+20(FP) + NEGL AX + MOVL AX, err+24(FP) + CALL runtime·exitsyscall(SB) + RET +okseek: + // system call filled in newoffset already + MOVL $0, err+24(FP) + CALL runtime·exitsyscall(SB) + RET |