diff options
Diffstat (limited to 'src/syscall/asm_linux_386.s')
| -rw-r--r-- | src/syscall/asm_linux_386.s | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_386.s b/src/syscall/asm_linux_386.s new file mode 100644 index 000000000..fa1b37120 --- /dev/null +++ b/src/syscall/asm_linux_386.s @@ -0,0 +1,187 @@ +// 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. + +// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) +// so that go vet can check that they are correct. + +#include "textflag.h" +#include "funcdata.h" + +// +// System calls for 386, Linux +// + +// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); +// Trap # in AX, args in BX CX DX SI DI, return in AX + +TEXT ·Syscall(SB),NOSPLIT,$0-28 + CALL runtime·entersyscall(SB) + MOVL 4(SP), AX // syscall entry + MOVL 8(SP), BX + MOVL 12(SP), CX + MOVL 16(SP), DX + MOVL $0, SI + MOVL $0, DI + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS ok + MOVL $-1, 20(SP) // r1 + MOVL $0, 24(SP) // r2 + NEGL AX + MOVL AX, 28(SP) // errno + CALL runtime·exitsyscall(SB) + RET +ok: + MOVL AX, 20(SP) // r1 + MOVL DX, 24(SP) // r2 + MOVL $0, 28(SP) // errno + CALL runtime·exitsyscall(SB) + RET + +// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); +TEXT ·Syscall6(SB),NOSPLIT,$0-40 + CALL runtime·entersyscall(SB) + MOVL 4(SP), AX // syscall entry + MOVL 8(SP), BX + MOVL 12(SP), CX + MOVL 16(SP), DX + MOVL 20(SP), SI + MOVL 24(SP), DI + MOVL 28(SP), BP + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS ok6 + MOVL $-1, 32(SP) // r1 + MOVL $0, 36(SP) // r2 + NEGL AX + MOVL AX, 40(SP) // errno + CALL runtime·exitsyscall(SB) + RET +ok6: + MOVL AX, 32(SP) // r1 + MOVL DX, 36(SP) // r2 + MOVL $0, 40(SP) // errno + CALL runtime·exitsyscall(SB) + RET + +// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); +TEXT ·RawSyscall(SB),NOSPLIT,$0-28 + MOVL 4(SP), AX // syscall entry + MOVL 8(SP), BX + MOVL 12(SP), CX + MOVL 16(SP), DX + MOVL $0, SI + MOVL $0, DI + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS ok1 + MOVL $-1, 20(SP) // r1 + MOVL $0, 24(SP) // r2 + NEGL AX + MOVL AX, 28(SP) // errno + RET +ok1: + MOVL AX, 20(SP) // r1 + MOVL DX, 24(SP) // r2 + MOVL $0, 28(SP) // errno + RET + +// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); +TEXT ·RawSyscall6(SB),NOSPLIT,$0-40 + MOVL 4(SP), AX // syscall entry + MOVL 8(SP), BX + MOVL 12(SP), CX + MOVL 16(SP), DX + MOVL 20(SP), SI + MOVL 24(SP), DI + MOVL 28(SP), BP + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS ok2 + MOVL $-1, 32(SP) // r1 + MOVL $0, 36(SP) // r2 + NEGL AX + MOVL AX, 40(SP) // errno + RET +ok2: + MOVL AX, 32(SP) // r1 + MOVL DX, 36(SP) // r2 + MOVL $0, 40(SP) // errno + RET + +#define SYS_SOCKETCALL 102 /* from zsysnum_linux_386.go */ + +// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno 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 4(SP), BX // socket call number + LEAL 8(SP), CX // pointer to call arguments + MOVL $0, DX + MOVL $0, SI + MOVL $0, DI + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS oksock + MOVL $-1, 32(SP) // n + NEGL AX + MOVL AX, 36(SP) // errno + CALL runtime·exitsyscall(SB) + RET +oksock: + MOVL AX, 32(SP) // n + MOVL $0, 36(SP) // errno + CALL runtime·exitsyscall(SB) + RET + +// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, errno int) +// Kernel interface gets call sub-number and pointer to a0. +TEXT ·rawsocketcall(SB),NOSPLIT,$0-36 + MOVL $SYS_SOCKETCALL, AX // syscall entry + MOVL 4(SP), BX // socket call number + LEAL 8(SP), CX // pointer to call arguments + MOVL $0, DX + MOVL $0, SI + MOVL $0, DI + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS oksock1 + MOVL $-1, 32(SP) // n + NEGL AX + MOVL AX, 36(SP) // errno + RET +oksock1: + MOVL AX, 32(SP) // n + MOVL $0, 36(SP) // errno + RET + +#define SYS__LLSEEK 140 /* from zsysnum_linux_386.go */ +// func Seek(fd int, offset int64, whence int) (newoffset int64, errno 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 4(SP), BX // fd + MOVL 12(SP), CX // offset-high + MOVL 8(SP), DX // offset-low + LEAL 20(SP), SI // result pointer + MOVL 16(SP), DI // whence + CALL *runtime·_vdso(SB) + CMPL AX, $0xfffff001 + JLS okseek + MOVL $-1, 20(SP) // newoffset low + MOVL $-1, 24(SP) // newoffset high + NEGL AX + MOVL AX, 28(SP) // errno + CALL runtime·exitsyscall(SB) + RET +okseek: + // system call filled in newoffset already + MOVL $0, 28(SP) // errno + CALL runtime·exitsyscall(SB) + RET |