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https://github.com/golang/go
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495eb3f922
Error returns for linux/arm syscalls are handled since a long time. Remove another list of unimplemented syscalls, following CL 96315. The root-only check in TestSyscallNoError was shown to be sufficient as part of CL 84485 already. NetBSD and OpenBSD do not implement the sendfile syscall (yet), so add a link to golang.org/issue/5847 Change-Id: I07efc3c3203537a4142707385f31b59dc0ecca42 Reviewed-on: https://go-review.googlesource.com/97115 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
168 lines
3.6 KiB
ArmAsm
168 lines
3.6 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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#include "funcdata.h"
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//
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// System calls for arm, Linux
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//
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// func Syscall(syscall uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
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TEXT ·Syscall(SB),NOSPLIT,$0-28
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BL runtime·entersyscall(SB)
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MOVW trap+0(FP), R7
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MOVW a1+4(FP), R0
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MOVW a2+8(FP), R1
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MOVW a3+12(FP), R2
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MOVW $0, R3
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MOVW $0, R4
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MOVW $0, R5
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SWI $0
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MOVW $0xfffff001, R1
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CMP R1, R0
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BLS ok
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MOVW $-1, R1
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MOVW R1, r1+16(FP)
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MOVW $0, R2
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MOVW R2, r2+20(FP)
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RSB $0, R0, R0
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MOVW R0, err+24(FP)
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BL runtime·exitsyscall(SB)
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RET
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ok:
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MOVW R0, r1+16(FP)
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MOVW $0, R0
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MOVW R0, r2+20(FP)
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MOVW R0, err+24(FP)
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BL runtime·exitsyscall(SB)
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RET
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// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
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// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
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TEXT ·Syscall6(SB),NOSPLIT,$0-40
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BL runtime·entersyscall(SB)
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MOVW trap+0(FP), R7 // syscall entry
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MOVW a1+4(FP), R0
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MOVW a2+8(FP), R1
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MOVW a3+12(FP), R2
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MOVW a4+16(FP), R3
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MOVW a5+20(FP), R4
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MOVW a6+24(FP), R5
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SWI $0
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MOVW $0xfffff001, R6
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CMP R6, R0
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BLS ok6
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MOVW $-1, R1
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MOVW R1, r1+28(FP)
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MOVW $0, R2
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MOVW R2, r2+32(FP)
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RSB $0, R0, R0
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MOVW R0, err+36(FP)
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BL runtime·exitsyscall(SB)
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RET
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ok6:
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MOVW R0, r1+28(FP)
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MOVW R1, r2+32(FP)
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MOVW $0, R0
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MOVW R0, err+36(FP)
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BL runtime·exitsyscall(SB)
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RET
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// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
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// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
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TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
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MOVW trap+0(FP), R7 // syscall entry
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MOVW a1+4(FP), R0
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MOVW a2+8(FP), R1
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MOVW a3+12(FP), R2
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MOVW a4+16(FP), R3
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MOVW a5+20(FP), R4
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MOVW a6+24(FP), R5
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SWI $0
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MOVW $0xfffff001, R6
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CMP R6, R0
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BLS ok2
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MOVW $-1, R1
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MOVW R1, r1+28(FP)
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MOVW $0, R2
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MOVW R2, r2+32(FP)
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RSB $0, R0, R0
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MOVW R0, err+36(FP)
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RET
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ok2:
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MOVW R0, r1+28(FP)
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MOVW R1, r2+32(FP)
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MOVW $0, R0
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MOVW R0, err+36(FP)
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RET
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#define SYS__LLSEEK 140 /* from zsysnum_linux_arm.go */
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// func seek(fd int, offset int64, whence int) (newoffset int64, errno int)
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// Implemented in assembly to avoid allocation when
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// taking the address of the return value newoffset.
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// Underlying system call is
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// llseek(int fd, int offhi, int offlo, int64 *result, int whence)
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TEXT ·seek(SB),NOSPLIT,$0-28
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BL runtime·entersyscall(SB)
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MOVW $SYS__LLSEEK, R7 // syscall entry
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MOVW fd+0(FP), R0
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MOVW offset_hi+8(FP), R1
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MOVW offset_lo+4(FP), R2
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MOVW $newoffset_lo+16(FP), R3
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MOVW whence+12(FP), R4
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SWI $0
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MOVW $0xfffff001, R6
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CMP R6, R0
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BLS okseek
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MOVW $0, R1
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MOVW R1, newoffset_lo+16(FP)
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MOVW R1, newoffset_hi+20(FP)
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RSB $0, R0, R0
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MOVW R0, err+24(FP)
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BL runtime·exitsyscall(SB)
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RET
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okseek:
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// system call filled in newoffset already
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MOVW $0, R0
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MOVW R0, err+24(FP)
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BL runtime·exitsyscall(SB)
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RET
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// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
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TEXT ·RawSyscall(SB),NOSPLIT,$0-28
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MOVW trap+0(FP), R7 // syscall entry
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MOVW a1+4(FP), R0
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MOVW a2+8(FP), R1
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MOVW a3+12(FP), R2
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SWI $0
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MOVW $0xfffff001, R1
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CMP R1, R0
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BLS ok1
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MOVW $-1, R1
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MOVW R1, r1+16(FP)
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MOVW $0, R2
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MOVW R2, r2+20(FP)
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RSB $0, R0, R0
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MOVW R0, err+24(FP)
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RET
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ok1:
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MOVW R0, r1+16(FP)
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MOVW $0, R0
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MOVW R0, r2+20(FP)
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MOVW R0, err+24(FP)
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RET
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// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
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TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24
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MOVW trap+0(FP), R7 // syscall entry
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MOVW a1+4(FP), R0
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MOVW a2+8(FP), R1
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MOVW a3+12(FP), R2
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SWI $0
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MOVW R0, r1+16(FP)
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MOVW $0, R0
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MOVW R0, r2+20(FP)
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RET
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