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// 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, a3 uintptr) (r1, err uintptr) TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24 MOVL trap+0(FP), AX // syscall entry MOVL a1+4(FP), BX MOVL a2+8(FP), CX MOVL a3+12(FP), DX POPL SI // preserve return address INVOKE_SYSCALL PUSHL SI CMPL AX, $0xfffff001 JLS ok MOVL $-1, r1+16(FP) NEGL AX MOVL AX, err+20(FP) RET ok: MOVL AX, r1+16(FP) MOVL $0, err+20(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