| | // 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. |
| |
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| | |
| | |
| |
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| | // |
| | // System calls for arm, Linux |
| | // |
| |
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| | |
| | // 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 路seek(SB),NOSPLIT,$0-28 |
| | BL runtime路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路exitsyscall(SB) |
| | RET |
| | okseek: |
| | // system call filled in newoffset already |
| | MOVW $0, R0 |
| | MOVW R0, err+24(FP) |
| | BL runtime路exitsyscall(SB) |
| | RET |
| |
|
| | // func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr) |
| | TEXT 路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 路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 |
| |
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