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1 | /* | |
2 | Copyright Edward Nevill + Oliver Kowalke 2015 | |
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 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
11 | * ------------------------------------------------- * | |
12 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
13 | * ------------------------------------------------- * | |
14 | * | d8 | d9 | d10 | d11 | * | |
15 | * ------------------------------------------------- * | |
16 | * ------------------------------------------------- * | |
17 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
18 | * ------------------------------------------------- * | |
19 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
20 | * ------------------------------------------------- * | |
21 | * | d12 | d13 | d14 | d15 | * | |
22 | * ------------------------------------------------- * | |
23 | * ------------------------------------------------- * | |
24 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
25 | * ------------------------------------------------- * | |
26 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
27 | * ------------------------------------------------- * | |
28 | * | x19 | x20 | x21 | x22 | * | |
29 | * ------------------------------------------------- * | |
30 | * ------------------------------------------------- * | |
31 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
32 | * ------------------------------------------------- * | |
33 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
34 | * ------------------------------------------------- * | |
35 | * | x23 | x24 | x25 | x26 | * | |
36 | * ------------------------------------------------- * | |
37 | * ------------------------------------------------- * | |
38 | * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | * | |
39 | * ------------------------------------------------- * | |
40 | * | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| * | |
41 | * ------------------------------------------------- * | |
42 | * | x27 | x28 | FP | LR | * | |
43 | * ------------------------------------------------- * | |
44 | * ------------------------------------------------- * | |
45 | * | 40 | 41 | 42 | 43 | | | * | |
46 | * ------------------------------------------------- * | |
47 | * | 0xa0| 0xa4| 0xa8| 0xac| | | * | |
48 | * ------------------------------------------------- * | |
49 | * | PC | align | | | * | |
50 | * ------------------------------------------------- * | |
51 | * * | |
52 | *******************************************************/ | |
53 | ||
54 | .text | |
55 | .align 2 | |
56 | .global jump_fcontext | |
57 | .type jump_fcontext, %function | |
58 | jump_fcontext: | |
59 | # prepare stack for GP + FPU | |
60 | sub sp, sp, #0xb0 | |
61 | ||
62 | # save d8 - d15 | |
63 | stp d8, d9, [sp, #0x00] | |
64 | stp d10, d11, [sp, #0x10] | |
65 | stp d12, d13, [sp, #0x20] | |
66 | stp d14, d15, [sp, #0x30] | |
67 | ||
68 | # save x19-x30 | |
69 | stp x19, x20, [sp, #0x40] | |
70 | stp x21, x22, [sp, #0x50] | |
71 | stp x23, x24, [sp, #0x60] | |
72 | stp x25, x26, [sp, #0x70] | |
73 | stp x27, x28, [sp, #0x80] | |
74 | stp x29, x30, [sp, #0x90] | |
75 | ||
76 | # save LR as PC | |
77 | str x30, [sp, #0xa0] | |
78 | ||
79 | # store RSP (pointing to context-data) in X0 | |
80 | mov x4, sp | |
81 | ||
82 | # restore RSP (pointing to context-data) from X1 | |
83 | mov sp, x0 | |
84 | ||
85 | # load d8 - d15 | |
86 | ldp d8, d9, [sp, #0x00] | |
87 | ldp d10, d11, [sp, #0x10] | |
88 | ldp d12, d13, [sp, #0x20] | |
89 | ldp d14, d15, [sp, #0x30] | |
90 | ||
91 | # load x19-x30 | |
92 | ldp x19, x20, [sp, #0x40] | |
93 | ldp x21, x22, [sp, #0x50] | |
94 | ldp x23, x24, [sp, #0x60] | |
95 | ldp x25, x26, [sp, #0x70] | |
96 | ldp x27, x28, [sp, #0x80] | |
97 | ldp x29, x30, [sp, #0x90] | |
98 | ||
99 | # return transfer_t from jump | |
100 | # pass transfer_t as first arg in context function | |
101 | # X0 == FCTX, X1 == DATA | |
102 | mov x0, x4 | |
103 | ||
104 | # load pc | |
105 | ldr x4, [sp, #0xa0] | |
106 | ||
107 | # restore stack from GP + FPU | |
108 | add sp, sp, #0xb0 | |
109 | ||
110 | ret x4 | |
111 | .size jump_fcontext,.-jump_fcontext | |
112 | # Mark that we don't need executable stack. | |
113 | .section .note.GNU-stack,"",%progbits |