asm_plan9_arm.s

Documentation: syscall

     1// Copyright 2009 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "textflag.h"
     6#include "funcdata.h"
     7
     8#define SYS_ERRSTR 41	/* from zsysnum_plan9.go */
     9#define SYS_SEEK 39	/* from zsysnum_plan9.go */
    10
    11// System call support for plan9 on arm
    12
    13//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err ErrorString)
    14TEXT	·Syscall(SB),NOSPLIT,$144-32
    15	NO_LOCAL_POINTERS
    16	BL		runtime·entersyscall(SB)
    17	MOVW	$a1+4(FP), R0	// move syscall args
    18	MOVW	$sysargs-144(SP), R1
    19	MOVM.IA	(R0), [R2-R4]
    20	MOVM.IA	[R2-R4], (R1)
    21	MOVW	trap+0(FP), R0	// syscall num
    22	SWI		$0
    23	MOVW	$0, R2
    24	MOVW	$r1+16(FP), R3
    25	MOVM.IA	[R0,R2], (R3)
    26	CMP		$-1, R0
    27	B.EQ	syscallerr
    28	BL		runtime·exitsyscall(SB)
    29	MOVW	$·emptystring+0(SB), R2
    30	B		syscallok
    31syscallerr:
    32	MOVW	$errbuf-128(SP), R2
    33	MOVW	$128, R3
    34	MOVM.IA	[R2,R3], (R1)
    35	MOVW	$SYS_ERRSTR, R0
    36	SWI		$0
    37	BL		runtime·exitsyscall(SB)
    38	BL		runtime·gostring(SB)
    39	MOVW	$str-140(SP), R2
    40syscallok:
    41	MOVW	$err+24(FP), R1
    42	MOVM.IA	(R2), [R3-R4]
    43	MOVM.IA	[R3-R4], (R1)
    44	RET
    45
    46
    47//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err ErrorString)
    48// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
    49TEXT	·Syscall6(SB),NOSPLIT,$144-44
    50	NO_LOCAL_POINTERS
    51	BL		runtime·entersyscall(SB)
    52	MOVW	$a1+4(FP), R0	// move syscall args
    53	MOVW	$sysargs-144(SP), R1
    54	MOVM.IA	(R0), [R2-R6]
    55	MOVM.IA	[R2-R6], (R1)
    56	MOVW	trap+0(FP), R0	// syscall num
    57	SWI		$0
    58	MOVW	$0, R2
    59	MOVW	$r1+28(FP), R3
    60	MOVM.IA.W	[R0,R2], (R3)
    61	CMP		$-1, R0
    62	B.EQ	syscall6err
    63	BL		runtime·exitsyscall(SB)
    64	MOVW	$·emptystring+0(SB), R2
    65	B		syscall6ok
    66syscall6err:
    67	MOVW	$errbuf-128(SP), R2
    68	MOVW	$128, R3
    69	MOVM.IA	[R2,R3], (R1)
    70	MOVW	$SYS_ERRSTR, R0
    71	SWI		$0
    72	BL		runtime·exitsyscall(SB)
    73	BL		runtime·gostring(SB)
    74	MOVW	$str-140(SP), R2
    75syscall6ok:
    76	MOVW	$err+36(FP), R1
    77	MOVM.IA	(R2), [R3-R4]
    78	MOVM.IA	[R3-R4], (R1)
    79	RET
    80
    81//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
    82TEXT ·RawSyscall(SB),NOSPLIT,$12-28
    83	MOVW	$a1+4(FP), R0	// move syscall args
    84	MOVW	$sysargs-12(SP), R1
    85	MOVM.IA	(R0), [R2-R4]
    86	MOVM.IA	[R2-R4], (R1)
    87	MOVW	trap+0(FP), R0	// syscall num
    88	SWI		$0
    89	MOVW	R0, r1+16(FP)
    90	MOVW	R0, r2+20(FP)
    91	MOVW	R0, err+24(FP)
    92	RET
    93
    94//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
    95// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
    96TEXT	·RawSyscall6(SB),NOSPLIT,$20-40
    97	MOVW	$a1+4(FP), R0	// move syscall args
    98	MOVW	$sysargs-20(SP), R1
    99	MOVM.IA	(R0), [R2-R6]
   100	MOVM.IA	[R2-R6], (R1)
   101	MOVW	trap+0(FP), R0	// syscall num
   102	SWI		$0
   103	MOVW	R0, r1+28(FP)
   104	MOVW	R0, r2+32(FP)
   105	MOVW	R0, err+36(FP)
   106	RET
   107
   108//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
   109TEXT ·seek(SB),NOSPLIT,$20-36
   110	NO_LOCAL_POINTERS
   111	MOVW	$newoffset_lo+20(FP), R6
   112	MOVW	R6, sysargs-20(SP)	// dest for return value
   113	MOVW	$fd+4(FP), R0		// move syscall args
   114	MOVW	$sysarg1-16(SP), R1
   115	MOVM.IA	(R0), [R2-R5]
   116	MOVM.IA	[R2-R5], (R1)
   117	MOVW	$SYS_SEEK, R0		// syscall num
   118	SWI		$0
   119	CMP		$-1, R0
   120	B.EQ	seekerr
   121	MOVW	$·emptystring+0(SB), R2
   122	B		seekok
   123seekerr:
   124	MOVW	R0, 0(R6)
   125	MOVW	R0, 4(R6)
   126	BL		·errstr(SB)
   127	MOVW	$ret-20(SP), R2
   128seekok:
   129	MOVW	$err+28(FP), R1
   130	MOVM.IA	(R2), [R3-R4]
   131	MOVM.IA	[R3-R4], (R1)
   132	RET
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