github.com/mdempsky/go@v0.0.0-20151201204031-5dd372bd1e70/src/syscall/asm_nacl_arm.s (about)

     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  
    19  TEXT ·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
    38  ok:
    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