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Text file src/syscall/asm_nacl_arm.s

Documentation: syscall

     1// Copyright 2014 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#include "../runtime/syscall_nacl.h"
     8
     9//
    10// System call support for ARM, Native Client
    11//
    12
    13#define NACL_SYSCALL(code) \
    14	MOVW $(0x10000 + ((code)<<5)), R8; BL (R8)
    15
    16#define NACL_SYSJMP(code) \
    17	MOVW $(0x10000 + ((code)<<5)), R8; B (R8)
    18
    19TEXT ·Syscall(SB),NOSPLIT,$0-28
    20	BL	runtime·entersyscall(SB)
    21	MOVW	trap+0(FP), R8
    22	MOVW	a1+4(FP), R0
    23	MOVW	a2+8(FP), R1
    24	MOVW	a3+12(FP), R2
    25	// more args would use R3, and then stack.
    26	MOVW	$0x10000, R7
    27	ADD	R8<<5, R7
    28	BL	(R7)
    29	CMP	$0, R0
    30	BGE	ok
    31	MOVW	$-1, R1
    32	MOVW	R1, r1+16(FP)
    33	MOVW	R1, r2+20(FP)
    34	RSB	$0, R0
    35	MOVW	R0, err+24(FP)
    36	BL	runtime·exitsyscall(SB)
    37	RET
    38ok:
    39	MOVW	R0, r1+16(FP)
    40	MOVW	R1, r2+20(FP)
    41	MOVW	$0, R2
    42	MOVW	R2, err+24(FP)
    43	BL	runtime·exitsyscall(SB)
    44	RET

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