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b32b8144 FG |
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 | */ | |
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7 | /******************************************************* |
8 | * * | |
9 | * ------------------------------------------------- * | |
10 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
11 | * ------------------------------------------------- * | |
12 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
13 | * ------------------------------------------------- * | |
b32b8144 | 14 | * | d8 | d9 | d10 | d11 | * |
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15 | * ------------------------------------------------- * |
16 | * ------------------------------------------------- * | |
17 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
18 | * ------------------------------------------------- * | |
19 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
20 | * ------------------------------------------------- * | |
b32b8144 | 21 | * | d12 | d13 | d14 | d15 | * |
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22 | * ------------------------------------------------- * |
23 | * ------------------------------------------------- * | |
24 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
25 | * ------------------------------------------------- * | |
26 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
27 | * ------------------------------------------------- * | |
b32b8144 | 28 | * | x19 | x20 | x21 | x22 | * |
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29 | * ------------------------------------------------- * |
30 | * ------------------------------------------------- * | |
31 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
32 | * ------------------------------------------------- * | |
33 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
34 | * ------------------------------------------------- * | |
b32b8144 FG |
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 | * ------------------------------------------------- * | |
7c673cae FG |
49 | * | PC | align | | | * |
50 | * ------------------------------------------------- * | |
51 | * * | |
52 | *******************************************************/ | |
53 | ||
54 | .text | |
55 | .globl _make_fcontext | |
56 | .balign 16 | |
57 | ||
58 | _make_fcontext: | |
59 | ; shift address in x0 (allocated stack) to lower 16 byte boundary | |
60 | and x0, x0, ~0xF | |
61 | ||
62 | ; reserve space for context-data on context-stack | |
b32b8144 | 63 | sub x0, x0, #0xb0 |
7c673cae FG |
64 | |
65 | ; third arg of make_fcontext() == address of context-function | |
66 | ; store address as a PC to jump in | |
b32b8144 | 67 | str x2, [x0, #0xa0] |
7c673cae FG |
68 | |
69 | ; compute abs address of label finish | |
70 | ; 0x0c = 3 instructions * size (4) before label 'finish' | |
71 | ||
72 | ; TODO: Numeric offset since llvm still does not support labels in ADR. Fix: | |
73 | ; http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140407/212336.html | |
74 | adr x1, 0x0c | |
75 | ||
76 | ; save address of finish as return-address for context-function | |
77 | ; will be entered after context-function returns (LR register) | |
b32b8144 | 78 | str x1, [x0, #0x98] |
7c673cae FG |
79 | |
80 | ret lr ; return pointer to context-data (x0) | |
81 | ||
82 | finish: | |
83 | ; exit code is zero | |
84 | mov x0, #0 | |
85 | ; exit application | |
86 | bl __exit | |
87 | ||
88 |