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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 | * | TOC | R14 | R15 | R16 | * | |
16 | * ------------------------------------------------- * | |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | * | |
21 | * ------------------------------------------------- * | |
22 | * | R17 | R18 | R19 | R20 | * | |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | * | |
28 | * ------------------------------------------------- * | |
29 | * | R21 | R22 | R23 | R24 | * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | * | |
35 | * ------------------------------------------------- * | |
36 | * | R25 | R26 | R27 | R28 | * | |
37 | * ------------------------------------------------- * | |
38 | * ------------------------------------------------- * | |
39 | * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | * | |
40 | * ------------------------------------------------- * | |
41 | * | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | * | |
42 | * ------------------------------------------------- * | |
43 | * | R29 | R30 | R31 | hidden | * | |
44 | * ------------------------------------------------- * | |
45 | * ------------------------------------------------- * | |
46 | * | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | * | |
47 | * ------------------------------------------------- * | |
48 | * | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 | * | |
49 | * ------------------------------------------------- * | |
50 | * | CR | LR | PC | back-chain| * | |
51 | * ------------------------------------------------- * | |
52 | * ------------------------------------------------- * | |
53 | * | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | * | |
54 | * ------------------------------------------------- * | |
55 | * | 192 | 196 | 200 | 204 | 208 | 212 | 216 | 220 | * | |
56 | * ------------------------------------------------- * | |
57 | * | cr saved | lr saved | compiler | linker | * | |
58 | * ------------------------------------------------- * | |
59 | * ------------------------------------------------- * | |
60 | * | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | * | |
61 | * ------------------------------------------------- * | |
62 | * | 224 | 228 | 232 | 236 | 240 | 244 | 248 | 252 | * | |
63 | * ------------------------------------------------- * | |
64 | * | TOC saved | FCTX | DATA | | * | |
65 | * ------------------------------------------------- * | |
66 | * * | |
67 | *******************************************************/ | |
68 | ||
69 | .text | |
70 | .align 2 | |
71 | .globl _jump_fcontext | |
72 | ||
73 | _jump_fcontext: | |
74 | ; reserve space on stack | |
75 | subi r1, r1, 184 | |
76 | ||
77 | std r14, 8(r1) ; save R14 | |
78 | std r15, 16(r1) ; save R15 | |
79 | std r16, 24(r1) ; save R16 | |
80 | std r17, 32(r1) ; save R17 | |
81 | std r18, 40(r1) ; save R18 | |
82 | std r19, 48(r1) ; save R19 | |
83 | std r20, 56(r1) ; save R20 | |
84 | std r21, 64(r1) ; save R21 | |
85 | std r22, 72(r1) ; save R22 | |
86 | std r23, 80(r1) ; save R23 | |
87 | std r24, 88(r1) ; save R24 | |
88 | std r25, 96(r1) ; save R25 | |
89 | std r26, 104(r1) ; save R26 | |
90 | std r27, 112(r1) ; save R27 | |
91 | std r28, 120(r1) ; save R28 | |
92 | std r29, 128(r1) ; save R29 | |
93 | std r30, 136(r1) ; save R30 | |
94 | std r31, 144(r1) ; save R31 | |
95 | std r3, 152(r1) ; save hidden | |
96 | ||
97 | ; save CR | |
98 | mfcr r0 | |
99 | std r0, 160(r1) | |
100 | ; save LR | |
101 | mflr r0 | |
102 | std r0, 168(r1) | |
103 | ; save LR as PC | |
104 | std r0, 176(r1) | |
105 | ||
106 | ; store RSP (pointing to context-data) in R6 | |
107 | mr r6, r1 | |
108 | ||
109 | ; restore RSP (pointing to context-data) from R4 | |
110 | mr r1, r4 | |
111 | ||
112 | ld r14, 8(r1) ; restore R14 | |
113 | ld r15, 16(r1) ; restore R15 | |
114 | ld r16, 24(r1) ; restore R16 | |
115 | ld r17, 32(r1) ; restore R17 | |
116 | ld r18, 40(r1) ; restore R18 | |
117 | ld r19, 48(r1) ; restore R19 | |
118 | ld r20, 56(r1) ; restore R20 | |
119 | ld r21, 64(r1) ; restore R21 | |
120 | ld r22, 72(r1) ; restore R22 | |
121 | ld r23, 80(r1) ; restore R23 | |
122 | ld r24, 88(r1) ; restore R24 | |
123 | ld r25, 96(r1) ; restore R25 | |
124 | ld r26, 104(r1) ; restore R26 | |
125 | ld r27, 112(r1) ; restore R27 | |
126 | ld r28, 120(r1) ; restore R28 | |
127 | ld r29, 128(r1) ; restore R29 | |
128 | ld r30, 136(r1) ; restore R30 | |
129 | ld r31, 144(r1) ; restore R31 | |
130 | ld r3, 152(r1) ; restore hidden | |
131 | ||
132 | ; restore CR | |
133 | ld r0, 160(r1) | |
134 | mtcr r0 | |
135 | ; restore LR | |
136 | ld r0, 168(r1) | |
137 | mtlr r0 | |
138 | ||
139 | ; load PC | |
140 | ld r12, 176(r1) | |
141 | # restore CTR | |
142 | mtctr r12 | |
143 | ||
144 | # adjust stack | |
145 | addi r1, r1, 184 | |
146 | ||
147 | # zero in r3 indicates first jump to context-function | |
148 | cmpdi r3, 0 | |
149 | beq use_entry_arg | |
150 | ||
151 | # return transfer_t | |
152 | std r6, 0(r3) | |
153 | std r5, 8(r3) | |
154 | ||
155 | # jump to context | |
156 | bctr | |
157 | ||
158 | use_entry_arg: | |
159 | # copy transfer_t into transfer_fn arg registers | |
160 | mr r3, r6 | |
161 | mr r4, r5 | |
162 | ||
163 | # jump to context | |
164 | bctr |