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asm_plan9_arm.s
// 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" #define SYS_ERRSTR 41 /* from zsysnum_plan9.go */ #define SYS_SEEK 39 /* from zsysnum_plan9.go */ // System call support for plan9 on arm //func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err ErrorString) TEXT ·Syscall(SB),NOSPLIT,$144-32 NO_LOCAL_POINTERS BL runtime·entersyscall(SB) MOVW $a1+4(FP), R0 // move syscall args MOVW $sysargs-144(SP), R1 MOVM.IA (R0), [R2-R4] MOVM.IA [R2-R4], (R1) MOVW trap+0(FP), R0 // syscall num SWI $0 MOVW $0, R2 MOVW $r1+16(FP), R3 MOVM.IA [R0,R2], (R3) CMP $-1, R0 B.EQ syscallerr BL runtime·exitsyscall(SB) MOVW $·emptystring+0(SB), R2 B syscallok syscallerr: MOVW $errbuf-128(SP), R2 MOVW $128, R3 MOVM.IA [R2,R3], (R1) MOVW $SYS_ERRSTR, R0 SWI $0 BL runtime·exitsyscall(SB) BL runtime·gostring(SB) MOVW $str-140(SP), R2 syscallok: MOVW $err+24(FP), R1 MOVM.IA (R2), [R3-R4] MOVM.IA [R3-R4], (R1) RET //func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err ErrorString) // Actually Syscall5 but the rest of the code expects it to be named Syscall6. TEXT ·Syscall6(SB),NOSPLIT,$144-44 NO_LOCAL_POINTERS BL runtime·entersyscall(SB) MOVW $a1+4(FP), R0 // move syscall args MOVW $sysargs-144(SP), R1 MOVM.IA (R0), [R2-R6] MOVM.IA [R2-R6], (R1) MOVW trap+0(FP), R0 // syscall num SWI $0 MOVW $0, R2 MOVW $r1+28(FP), R3 MOVM.IA.W [R0,R2], (R3) CMP $-1, R0 B.EQ syscall6err BL runtime·exitsyscall(SB) MOVW $·emptystring+0(SB), R2 B syscall6ok syscall6err: MOVW $errbuf-128(SP), R2 MOVW $128, R3 MOVM.IA [R2,R3], (R1) MOVW $SYS_ERRSTR, R0 SWI $0 BL runtime·exitsyscall(SB) BL runtime·gostring(SB) MOVW $str-140(SP), R2 syscall6ok: MOVW $err+36(FP), R1 MOVM.IA (R2), [R3-R4] MOVM.IA [R3-R4], (R1) RET //func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) TEXT ·RawSyscall(SB),NOSPLIT,$12-28 MOVW $a1+4(FP), R0 // move syscall args MOVW $sysargs-12(SP), R1 MOVM.IA (R0), [R2-R4] MOVM.IA [R2-R4], (R1) MOVW trap+0(FP), R0 // syscall num SWI $0 MOVW R0, r1+16(FP) MOVW R0, r2+20(FP) MOVW R0, err+24(FP) RET //func RawSyscall6(trap, 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,$20-40 MOVW $a1+4(FP), R0 // move syscall args MOVW $sysargs-20(SP), R1 MOVM.IA (R0), [R2-R6] MOVM.IA [R2-R6], (R1) MOVW trap+0(FP), R0 // syscall num SWI $0 MOVW R0, r1+28(FP) MOVW R0, r2+32(FP) MOVW R0, err+36(FP) RET //func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string) TEXT ·seek(SB),NOSPLIT,$20-36 NO_LOCAL_POINTERS MOVW $newoffset_lo+20(FP), R6 MOVW R6, sysargs-20(SP) // dest for return value MOVW $fd+4(FP), R0 // move syscall args MOVW $sysarg1-16(SP), R1 MOVM.IA (R0), [R2-R5] MOVM.IA [R2-R5], (R1) MOVW $SYS_SEEK, R0 // syscall num SWI $0 CMP $-1, R0 B.EQ seekerr MOVW $·emptystring+0(SB), R2 B seekok seekerr: MOVW R0, 0(R6) MOVW R0, 4(R6) BL ·errstr(SB) MOVW $ret-20(SP), R2 seekok: MOVW $err+28(FP), R1 MOVM.IA (R2), [R3-R4] MOVM.IA [R3-R4], (R1) RET
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