diff options
Diffstat (limited to 'src/syscall/asm_linux_arm.s')
| -rw-r--r-- | src/syscall/asm_linux_arm.s | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/src/syscall/asm_linux_arm.s b/src/syscall/asm_linux_arm.s new file mode 100644 index 000000000..352653301 --- /dev/null +++ b/src/syscall/asm_linux_arm.s @@ -0,0 +1,159 @@ +// 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 +// + +// TODO(kaib): handle error returns + +// func Syscall(syscall uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); + +TEXT ·Syscall(SB),NOSPLIT,$0-28 + BL runtime·entersyscall(SB) + MOVW 4(SP), R7 + MOVW 8(SP), R0 + MOVW 12(SP), R1 + MOVW 16(SP), R2 + MOVW $0, R3 + MOVW $0, R4 + MOVW $0, R5 + SWI $0 + MOVW $0xfffff001, R1 + CMP R1, R0 + BLS ok + MOVW $-1, R1 + MOVW R1, 20(SP) // r1 + MOVW $0, R2 + MOVW R2, 24(SP) // r2 + RSB $0, R0, R0 + MOVW R0, 28(SP) // errno + BL runtime·exitsyscall(SB) + RET +ok: + MOVW R0, 20(SP) // r1 + MOVW $0, R0 + MOVW R0, 24(SP) // r2 + MOVW R0, 28(SP) // errno + BL 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),NOSPLIT,$0-40 + BL runtime·entersyscall(SB) + MOVW 4(SP), R7 // syscall entry + MOVW 8(SP), R0 + MOVW 12(SP), R1 + MOVW 16(SP), R2 + MOVW 20(SP), R3 + MOVW 24(SP), R4 + MOVW 28(SP), R5 + SWI $0 + MOVW $0xfffff001, R6 + CMP R6, R0 + BLS ok6 + MOVW $-1, R1 + MOVW R1, 32(SP) // r1 + MOVW $0, R2 + MOVW R2, 36(SP) // r2 + RSB $0, R0, R0 + MOVW R0, 40(SP) // errno + BL runtime·exitsyscall(SB) + RET +ok6: + MOVW R0, 32(SP) // r1 + MOVW R1, 36(SP) // r2 + MOVW $0, R0 + MOVW R0, 40(SP) // errno + BL runtime·exitsyscall(SB) + RET + +// func RawSyscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr); +// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6. +TEXT ·RawSyscall6(SB),NOSPLIT,$0-40 + MOVW 4(SP), R7 // syscall entry + MOVW 8(SP), R0 + MOVW 12(SP), R1 + MOVW 16(SP), R2 + MOVW 20(SP), R3 + MOVW 24(SP), R4 + MOVW 28(SP), R5 + SWI $0 + MOVW $0xfffff001, R6 + CMP R6, R0 + BLS ok2 + MOVW $-1, R1 + MOVW R1, 32(SP) // r1 + MOVW $0, R2 + MOVW R2, 36(SP) // r2 + RSB $0, R0, R0 + MOVW R0, 40(SP) // errno + RET +ok2: + MOVW R0, 32(SP) // r1 + MOVW R1, 36(SP) // r2 + MOVW $0, R0 + MOVW R0, 40(SP) // errno + RET + +#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,$0-32 + BL runtime·entersyscall(SB) + MOVW $SYS__LLSEEK, R7 // syscall entry + MOVW 4(SP), R0 // fd + MOVW 12(SP), R1 // offset-high + MOVW 8(SP), R2 // offset-low + MOVW $20(SP), R3 + MOVW 16(SP), R4 // whence + SWI $0 + MOVW $0xfffff001, R6 + CMP R6, R0 + BLS okseek + MOVW $0, R1 + MOVW R1, 20(SP) + MOVW R1, 24(SP) + RSB $0, R0, R0 + MOVW R0, 28(SP) // errno + BL runtime·exitsyscall(SB) + RET +okseek: + // system call filled in newoffset already + MOVW $0, R0 + MOVW R0, 28(SP) // errno + BL runtime·exitsyscall(SB) + RET + +// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr); +TEXT ·RawSyscall(SB),NOSPLIT,$0-28 + MOVW 4(SP), R7 // syscall entry + MOVW 8(SP), R0 + MOVW 12(SP), R1 + MOVW 16(SP), R2 + SWI $0 + MOVW $0xfffff001, R1 + CMP R1, R0 + BLS ok1 + MOVW $-1, R1 + MOVW R1, 20(SP) // r1 + MOVW $0, R2 + MOVW R2, 24(SP) // r2 + RSB $0, R0, R0 + MOVW R0, 28(SP) // errno + RET +ok1: + MOVW R0, 20(SP) // r1 + MOVW $0, R0 + MOVW R0, 24(SP) // r2 + MOVW R0, 28(SP) // errno + RET + |