brk.S revision 1.3 
1#include "SYS.h"
2
3	.extern curbrk
4	.extern _C_LABEL(end)
5
6PREFIX2(brk,break)
7
8	/* check >= _end, if not make the call for _end */
9#ifndef PIC
10	addis 5,0,_C_LABEL(end)@h
11	ori  5,5,_C_LABEL(end)@l		/* # 5 = &_end */
12#else
13	mflr	10
14	bl	_GLOBAL_OFFSET_TABLE_@local-4
15	mflr	9
16	mtlr	10
17	lwz	5,_C_LABEL(end)@got(9)
18#endif
19	cmpw	3,5
20	bge+	.L_brk_call
21	mr	3, 5
22
23.L_brk_call:
24	mr	7, 3
25	/* call break(size) */
26#ifndef PIC
27	addis	6, 0, curbrk@H
28	ori	6, 6, curbrk@L	/* # 6 = &curbrk */
29#else
30	lwz	6,_ASM_LABEL(curbrk)@got(9)
31#endif
32
33	sc
34
35	/* check for error */
36	cmpwi	0, 0
37	beq+	.L_brk_ok	/* OK so this is stupid but I haven't read b */
38	b	PIC_PLT(_ASM_LABEL(cerror))
39
40	/* update, curbrk and return */
41.L_brk_ok:
42	stw	7, 0(6)		/* # remember, 6=&curbrk, 3= new value */
43	mr	3, 0		/* # return 0 */
44	blr
45