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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.
//
// 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),7,$0
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
INT $0x80
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);
// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
TEXT ·Syscall6(SB),7,$0
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
// 28(SP) is ignored
INT $0x80
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),7,$0
MOVL 4(SP), AX // syscall entry
MOVL 8(SP), BX
MOVL 12(SP), CX
MOVL 16(SP), DX
MOVL $0, SI
MOVL $0, DI
INT $0x80
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
#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),7,$0
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
INT $0x80
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
#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),7,$0
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
INT $0x80
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
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