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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 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
9 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
10 *
11 * setjmp/longjmp code by Paul Mackerras.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18 #include <asm/ppc_asm.h>
19 #include <asm/unistd.h>
20 #include <asm/asm-compat.h>
21 #include <asm/asm-offsets.h>
22
23 .text
24
25 /*
26 * Returns (address we are running at) - (address we were linked at)
27 * for use before the text and data are mapped to KERNELBASE.
28 */
29
30 _GLOBAL(reloc_offset)
31 mflr r0
32 bl 1f
33 1: mflr r3
34 LOAD_REG_IMMEDIATE(r4,1b)
35 subf r3,r4,r3
36 mtlr r0
37 blr
38
39 /*
40 * add_reloc_offset(x) returns x + reloc_offset().
41 */
42 _GLOBAL(add_reloc_offset)
43 mflr r0
44 bl 1f
45 1: mflr r5
46 LOAD_REG_IMMEDIATE(r4,1b)
47 subf r5,r4,r5
48 add r3,r3,r5
49 mtlr r0
50 blr
51
52 _GLOBAL(kernel_execve)
53 li r0,__NR_execve
54 sc
55 bnslr
56 neg r3,r3
57 blr
58
59 _GLOBAL(setjmp)
60 mflr r0
61 PPC_STL r0,0(r3)
62 PPC_STL r1,SZL(r3)
63 PPC_STL r2,2*SZL(r3)
64 mfcr r0
65 PPC_STL r0,3*SZL(r3)
66 PPC_STL r13,4*SZL(r3)
67 PPC_STL r14,5*SZL(r3)
68 PPC_STL r15,6*SZL(r3)
69 PPC_STL r16,7*SZL(r3)
70 PPC_STL r17,8*SZL(r3)
71 PPC_STL r18,9*SZL(r3)
72 PPC_STL r19,10*SZL(r3)
73 PPC_STL r20,11*SZL(r3)
74 PPC_STL r21,12*SZL(r3)
75 PPC_STL r22,13*SZL(r3)
76 PPC_STL r23,14*SZL(r3)
77 PPC_STL r24,15*SZL(r3)
78 PPC_STL r25,16*SZL(r3)
79 PPC_STL r26,17*SZL(r3)
80 PPC_STL r27,18*SZL(r3)
81 PPC_STL r28,19*SZL(r3)
82 PPC_STL r29,20*SZL(r3)
83 PPC_STL r30,21*SZL(r3)
84 PPC_STL r31,22*SZL(r3)
85 li r3,0
86 blr
87
88 _GLOBAL(longjmp)
89 PPC_LCMPI r4,0
90 bne 1f
91 li r4,1
92 1: PPC_LL r13,4*SZL(r3)
93 PPC_LL r14,5*SZL(r3)
94 PPC_LL r15,6*SZL(r3)
95 PPC_LL r16,7*SZL(r3)
96 PPC_LL r17,8*SZL(r3)
97 PPC_LL r18,9*SZL(r3)
98 PPC_LL r19,10*SZL(r3)
99 PPC_LL r20,11*SZL(r3)
100 PPC_LL r21,12*SZL(r3)
101 PPC_LL r22,13*SZL(r3)
102 PPC_LL r23,14*SZL(r3)
103 PPC_LL r24,15*SZL(r3)
104 PPC_LL r25,16*SZL(r3)
105 PPC_LL r26,17*SZL(r3)
106 PPC_LL r27,18*SZL(r3)
107 PPC_LL r28,19*SZL(r3)
108 PPC_LL r29,20*SZL(r3)
109 PPC_LL r30,21*SZL(r3)
110 PPC_LL r31,22*SZL(r3)
111 PPC_LL r0,3*SZL(r3)
112 mtcrf 0x38,r0
113 PPC_LL r0,0(r3)
114 PPC_LL r1,SZL(r3)
115 PPC_LL r2,2*SZL(r3)
116 mtlr r0
117 mr r3,r4
118 blr