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Diffstat (limited to '')
| -rw-r--r-- | src/syscall/asm_linux_arm.s | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_arm.s b/src/syscall/asm_linux_arm.s new file mode 100644 index 0000000..06a35b5 --- /dev/null +++ b/src/syscall/asm_linux_arm.s @@ -0,0 +1,75 @@ +// 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 arm, Linux +// + +#define SYS__LLSEEK 140 /* from zsysnum_linux_arm.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 + BL runtime·entersyscall(SB) + MOVW $SYS__LLSEEK, R7 // syscall entry + MOVW fd+0(FP), R0 + MOVW offset_hi+8(FP), R1 + MOVW offset_lo+4(FP), R2 + MOVW $newoffset_lo+16(FP), R3 + MOVW whence+12(FP), R4 + SWI $0 + MOVW $0xfffff001, R6 + CMP R6, R0 + BLS okseek + MOVW $0, R1 + MOVW R1, newoffset_lo+16(FP) + MOVW R1, newoffset_hi+20(FP) + RSB $0, R0, R0 + MOVW R0, err+24(FP) + BL runtime·exitsyscall(SB) + RET +okseek: + // system call filled in newoffset already + MOVW $0, R0 + MOVW R0, err+24(FP) + BL runtime·exitsyscall(SB) + RET + +// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr) +TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24 + MOVW trap+0(FP), R7 // syscall entry + MOVW a1+4(FP), R0 + MOVW a2+8(FP), R1 + MOVW a3+12(FP), R2 + SWI $0 + MOVW $0xfffff001, R1 + CMP R1, R0 + BLS ok + MOVW $-1, R1 + MOVW R1, r1+16(FP) + RSB $0, R0, R0 + MOVW R0, err+20(FP) + RET +ok: + MOVW R0, r1+16(FP) + MOVW $0, R0 + MOVW R0, err+20(FP) + RET + +// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr); +TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24 + MOVW trap+0(FP), R7 // syscall entry + MOVW a1+4(FP), R0 + MOVW a2+8(FP), R1 + MOVW a3+12(FP), R2 + SWI $0 + MOVW R0, r1+16(FP) + MOVW $0, R0 + MOVW R0, r2+20(FP) + RET |