| // 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 uintptr) (r1, err uintptr) |
| TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-20 |
| MOVW trap+0(FP), R7 // syscall entry |
| MOVW a1+4(FP), R0 |
| MOVW a2+8(FP), R1 |
| MOVW $0, R2 |
| SWI $0 |
| MOVW $0xfffff001, R1 |
| CMP R1, R0 |
| BLS ok |
| MOVW $-1, R1 |
| MOVW R1, r1+12(FP) |
| RSB $0, R0, R0 |
| MOVW R0, err+16(FP) |
| RET |
| ok: |
| MOVW R0, r1+12(FP) |
| MOVW $0, R0 |
| MOVW R0, err+16(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 |
