arch/arm/syscall.S

/*
 * arch/arm/syscall.S
 *
 * System call common handling
 */

	.type	__syscall_common,#function
	.globl	__syscall_common
#ifndef __thumb__
	/* ARM version - this is executed after the swi, unless
	   we are compiled in EABI mode */

	.balign	4
__syscall_common:
#ifdef __ARM_EABI__
	ldr	r4, [sp,#16]
	ldr	r5, [sp,#20]
	ldr	r7, [lr]
	swi	0
#endif
        cmn     r0, #4096
        rsbcs	r2, r0, #0
        ldrcs	r3, 1f
        mvncs	r0, #0
        strcs	r2, [r3]
#ifdef __ARM_EABI__
	ldmfd	sp!,{r4,r5,r7,pc}
#else
	ldmfd	sp!,{r4,r5,pc}
#endif

	.balign 4
1:
	.word	errno

#else
	/* Thumb version - must still load r4 and r5 and run swi */

	.thumb_func
	.balign	2
__syscall_common:
	mov	r7, lr
	ldr	r4, [sp,#16]
	sub	r7, #1		/* Remove the Thumb bit */
	ldr	r5, [sp,#20]
	ldrh	r7, [r7]
	swi	0
	ldr	r1, 2f
	cmp	r0, r1
	bcc	1f
	ldr	r1, 3f
	neg	r2, r0
	mov	r0, #1
	str	r2, [r1]
	neg	r0, r0
1:
	pop	{r4,r5,r7,pc}

	.balign	4
2:
	.word	-4095
3:
	.word	errno

#endif
1	/*
2	* arch/arm/syscall.S
3	*
4	* System call common handling
5	*/
6
7	.type __syscall_common,#function
8	.globl __syscall_common
9	#ifndef __thumb__
10	/* ARM version - this is executed after the swi, unless
11	we are compiled in EABI mode */
12
13	.balign 4
14	__syscall_common:
15	#ifdef __ARM_EABI__
16	ldr r4, [sp,#16]
17	ldr r5, [sp,#20]
18	ldr r7, [lr]
19	swi 0
20	#endif
21	cmn r0, #4096
22	rsbcs r2, r0, #0
23	ldrcs r3, 1f
24	mvncs r0, #0
25	strcs r2, [r3]
26	#ifdef __ARM_EABI__
27	ldmfd sp!,{r4,r5,r7,pc}
28	#else
29	ldmfd sp!,{r4,r5,pc}
30	#endif
31
32	.balign 4
33	1:
34	.word errno
35
36	#else
37	/* Thumb version - must still load r4 and r5 and run swi */
38
39	.thumb_func
40	.balign 2
41	__syscall_common:
42	mov r7, lr
43	ldr r4, [sp,#16]
44	sub r7, #1 /* Remove the Thumb bit */
45	ldr r5, [sp,#20]
46	ldrh r7, [r7]
47	swi 0
48	ldr r1, 2f
49	cmp r0, r1
50	bcc 1f
51	ldr r1, 3f
52	neg r2, r0
53	mov r0, #1
54	str r2, [r1]
55	neg r0, r0
56	1:
57	pop {r4,r5,r7,pc}
58
59	.balign 4
60	2:
61	.word -4095
62	3:
63	.word errno
64
65	#endif