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7c673cae FG |
1 | /* |
2 | Copyright Oliver Kowalke 2009. | |
3 | Distributed under the Boost Software License, Version 1.0. | |
4 | (See accompanying file LICENSE_1_0.txt or copy at | |
5 | http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | ||
8 | /******************************************************* | |
9 | * * | |
10 | * ------------------------------------------------- * | |
11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
12 | * ------------------------------------------------- * | |
13 | * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | * | |
14 | * ------------------------------------------------- * | |
15 | * | R13 | R14 | R15 | R16 | R17 | R18 | R19 | R20 | * | |
16 | * ------------------------------------------------- * | |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | * | |
21 | * ------------------------------------------------- * | |
22 | * | R21 | R22 | R23 | R24 | R25 | R26 | R27 | R28 | * | |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | * | |
28 | * ------------------------------------------------- * | |
29 | * | R29 | R30 | R31 |hiddn| CR | LR | PC | FCTX| * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | * | |
35 | * ------------------------------------------------- * | |
36 | * | DATA| | | | | * | |
37 | * ------------------------------------------------- * | |
38 | * * | |
39 | *******************************************************/ | |
40 | ||
41 | .text | |
42 | .globl ontop_fcontext | |
43 | .align 2 | |
44 | .type ontop_fcontext,@function | |
45 | ontop_fcontext: | |
46 | # reserve space on stack | |
47 | subi %r1, %r1, 92 | |
48 | ||
49 | stw %r13, 0(%r1) # save R13 | |
50 | stw %r14, 4(%r1) # save R14 | |
51 | stw %r15, 8(%r1) # save R15 | |
52 | stw %r16, 12(%r1) # save R16 | |
53 | stw %r17, 16(%r1) # save R17 | |
54 | stw %r18, 20(%r1) # save R18 | |
55 | stw %r19, 24(%r1) # save R19 | |
56 | stw %r20, 28(%r1) # save R20 | |
57 | stw %r21, 32(%r1) # save R21 | |
58 | stw %r22, 36(%r1) # save R22 | |
59 | stw %r23, 40(%r1) # save R23 | |
60 | stw %r24, 44(%r1) # save R24 | |
61 | stw %r25, 48(%r1) # save R25 | |
62 | stw %r26, 52(%r1) # save R26 | |
63 | stw %r27, 56(%r1) # save R27 | |
64 | stw %r28, 60(%r1) # save R28 | |
65 | stw %r29, 64(%r1) # save R29 | |
66 | stw %r30, 68(%r1) # save R30 | |
67 | stw %r31, 72(%r1) # save R31 | |
68 | stw %r3, 76(%r1) # save hidden | |
69 | ||
70 | # save CR | |
71 | mfcr %r0 | |
72 | stw %r0, 80(%r1) | |
73 | # save LR | |
74 | mflr %r0 | |
75 | stw %r0, 84(%r1) | |
76 | # save LR as PC | |
77 | stw %r0, 88(%r1) | |
78 | ||
79 | # store RSP (pointing to context-data) in R7 | |
80 | mr %r7, %r1 | |
81 | ||
82 | # restore RSP (pointing to context-data) from R4 | |
83 | mr %r1, %r4 | |
84 | ||
85 | lwz %r13, 0(%r1) # restore R13 | |
86 | lwz %r14, 4(%r1) # restore R14 | |
87 | lwz %r15, 8(%r1) # restore R15 | |
88 | lwz %r16, 12(%r1) # restore R16 | |
89 | lwz %r17, 16(%r1) # restore R17 | |
90 | lwz %r18, 20(%r1) # restore R18 | |
91 | lwz %r19, 24(%r1) # restore R19 | |
92 | lwz %r20, 28(%r1) # restore R20 | |
93 | lwz %r21, 32(%r1) # restore R21 | |
94 | lwz %r22, 36(%r1) # restore R22 | |
95 | lwz %r23, 40(%r1) # restore R23 | |
96 | lwz %r24, 44(%r1) # restore R24 | |
97 | lwz %r25, 48(%r1) # restore R25 | |
98 | lwz %r26, 52(%r1) # restore R26 | |
99 | lwz %r27, 56(%r1) # restore R27 | |
100 | lwz %r28, 60(%r1) # restore R28 | |
101 | lwz %r29, 64(%r1) # restore R29 | |
102 | lwz %r30, 68(%r1) # restore R30 | |
103 | lwz %r31, 72(%r1) # restore R31 | |
104 | lwz %r4, 76(%r1) # restore hidden | |
105 | ||
106 | # restore CR | |
107 | lwz %r0, 80(%r1) | |
108 | mtcr %r0 | |
109 | # restore LR | |
110 | lwz %r0, 84(%r1) | |
111 | mtlr %r0 | |
112 | # ignore PC | |
113 | ||
114 | # adjust stack | |
115 | addi %r1, %r1, 92 | |
116 | ||
117 | # return transfer_t | |
118 | stw %r7, 0(%r4) | |
119 | stw %r5, 4(%r4) | |
120 | ||
121 | # restore CTR | |
122 | mtctr %r6 | |
123 | ||
124 | # jump to ontop-function | |
125 | bctr | |
126 | .size ontop_fcontext, .-ontop_fcontext | |
127 | ||
128 | /* Mark that we don't need executable stack. */ | |
129 | .section .note.GNU-stack,"",%progbits |