1/*
2 * This file contains miscellaneous low-level functions.
3 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
6 * and Paul Mackerras.
7 *
8 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
9 *
10 * setjmp/longjmp code by Paul Mackerras.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17#include <asm/ppc_asm.h>
18#include <asm/unistd.h>
19#include <asm/asm-compat.h>
20#include <asm/asm-offsets.h>
21
22	.text
23
24/*
25 * Returns (address we are running at) - (address we were linked at)
26 * for use before the text and data are mapped to KERNELBASE.
27 */
28
29_GLOBAL(reloc_offset)
30	mflr	r0
31	bl	1f
321:	mflr	r3
33	PPC_LL	r4,(2f-1b)(r3)
34	subf	r3,r4,r3
35	mtlr	r0
36	blr
37
38	.align	3
392:	PPC_LONG 1b
40
41/*
42 * add_reloc_offset(x) returns x + reloc_offset().
43 */
44_GLOBAL(add_reloc_offset)
45	mflr	r0
46	bl	1f
471:	mflr	r5
48	PPC_LL	r4,(2f-1b)(r5)
49	subf	r5,r4,r5
50	add	r3,r3,r5
51	mtlr	r0
52	blr
53
54	.align	3
552:	PPC_LONG 1b
56
57_GLOBAL(setjmp)
58	mflr	r0
59	PPC_STL	r0,0(r3)
60	PPC_STL	r1,SZL(r3)
61	PPC_STL	r2,2*SZL(r3)
62	mfcr	r0
63	PPC_STL	r0,3*SZL(r3)
64	PPC_STL	r13,4*SZL(r3)
65	PPC_STL	r14,5*SZL(r3)
66	PPC_STL	r15,6*SZL(r3)
67	PPC_STL	r16,7*SZL(r3)
68	PPC_STL	r17,8*SZL(r3)
69	PPC_STL	r18,9*SZL(r3)
70	PPC_STL	r19,10*SZL(r3)
71	PPC_STL	r20,11*SZL(r3)
72	PPC_STL	r21,12*SZL(r3)
73	PPC_STL	r22,13*SZL(r3)
74	PPC_STL	r23,14*SZL(r3)
75	PPC_STL	r24,15*SZL(r3)
76	PPC_STL	r25,16*SZL(r3)
77	PPC_STL	r26,17*SZL(r3)
78	PPC_STL	r27,18*SZL(r3)
79	PPC_STL	r28,19*SZL(r3)
80	PPC_STL	r29,20*SZL(r3)
81	PPC_STL	r30,21*SZL(r3)
82	PPC_STL	r31,22*SZL(r3)
83	li	r3,0
84	blr
85
86_GLOBAL(longjmp)
87	PPC_LCMPI r4,0
88	bne	1f
89	li	r4,1
901:	PPC_LL	r13,4*SZL(r3)
91	PPC_LL	r14,5*SZL(r3)
92	PPC_LL	r15,6*SZL(r3)
93	PPC_LL	r16,7*SZL(r3)
94	PPC_LL	r17,8*SZL(r3)
95	PPC_LL	r18,9*SZL(r3)
96	PPC_LL	r19,10*SZL(r3)
97	PPC_LL	r20,11*SZL(r3)
98	PPC_LL	r21,12*SZL(r3)
99	PPC_LL	r22,13*SZL(r3)
100	PPC_LL	r23,14*SZL(r3)
101	PPC_LL	r24,15*SZL(r3)
102	PPC_LL	r25,16*SZL(r3)
103	PPC_LL	r26,17*SZL(r3)
104	PPC_LL	r27,18*SZL(r3)
105	PPC_LL	r28,19*SZL(r3)
106	PPC_LL	r29,20*SZL(r3)
107	PPC_LL	r30,21*SZL(r3)
108	PPC_LL	r31,22*SZL(r3)
109	PPC_LL	r0,3*SZL(r3)
110	mtcrf	0x38,r0
111	PPC_LL	r0,0(r3)
112	PPC_LL	r1,SZL(r3)
113	PPC_LL	r2,2*SZL(r3)
114	mtlr	r0
115	mr	r3,r4
116	blr
117
118_GLOBAL(current_stack_pointer)
119	PPC_LL	r3,0(r1)
120	blr
121