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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 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
14 | * ------------------------------------------------- * | |
b32b8144 | 15 | * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | * |
7c673cae FG |
16 | * ------------------------------------------------- * |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
21 | * ------------------------------------------------- * | |
b32b8144 FG |
22 | * | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 | * |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
28 | * ------------------------------------------------- * | |
29 | * |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
35 | * ------------------------------------------------- * | |
7c673cae FG |
36 | * | v8 | lr | pc | FCTX| DATA| | * |
37 | * ------------------------------------------------- * | |
38 | * * | |
39 | *******************************************************/ | |
40 | ||
92f5a8d4 | 41 | .file "make_arm_aapcs_elf_gas.S" |
7c673cae FG |
42 | .text |
43 | .globl make_fcontext | |
44 | .align 2 | |
45 | .type make_fcontext,%function | |
92f5a8d4 | 46 | .syntax unified |
7c673cae FG |
47 | make_fcontext: |
48 | @ shift address in A1 to lower 16 byte boundary | |
49 | bic a1, a1, #15 | |
50 | ||
51 | @ reserve space for context-data on context-stack | |
b32b8144 | 52 | sub a1, a1, #124 |
7c673cae FG |
53 | |
54 | @ third arg of make_fcontext() == address of context-function | |
b32b8144 | 55 | str a3, [a1, #104] |
7c673cae FG |
56 | |
57 | @ compute address of returned transfer_t | |
b32b8144 | 58 | add a2, a1, #108 |
7c673cae | 59 | mov a3, a2 |
b32b8144 | 60 | str a3, [a1, #64] |
7c673cae FG |
61 | |
62 | @ compute abs address of label finish | |
63 | adr a2, finish | |
64 | @ save address of finish as return-address for context-function | |
65 | @ will be entered after context-function returns | |
b32b8144 FG |
66 | str a2, [a1, #100] |
67 | ||
68 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) | |
69 | #endif | |
7c673cae FG |
70 | |
71 | bx lr @ return pointer to context-data | |
72 | ||
73 | finish: | |
74 | @ exit code is zero | |
75 | mov a1, #0 | |
76 | @ exit application | |
77 | bl _exit@PLT | |
78 | .size make_fcontext,.-make_fcontext | |
79 | ||
80 | @ Mark that we don't need executable stack. | |
81 | .section .note.GNU-stack,"",%progbits |