]>
Commit | Line | Data |
---|---|---|
7c673cae 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 | */ | |
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 | * |
7c673cae FG |
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 | * |
7c673cae FG |
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 | * |
7c673cae FG |
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 | ||
92f5a8d4 | 54 | .file "make_arm64_aapcs_elf_gas.S" |
7c673cae FG |
55 | .text |
56 | .align 2 | |
57 | .global make_fcontext | |
58 | .type make_fcontext, %function | |
59 | make_fcontext: | |
60 | # shift address in x0 (allocated stack) to lower 16 byte boundary | |
61 | and x0, x0, ~0xF | |
62 | ||
63 | # reserve space for context-data on context-stack | |
b32b8144 | 64 | sub x0, x0, #0xb0 |
7c673cae FG |
65 | |
66 | # third arg of make_fcontext() == address of context-function | |
67 | # store address as a PC to jump in | |
b32b8144 | 68 | str x2, [x0, #0xa0] |
7c673cae FG |
69 | |
70 | # save address of finish as return-address for context-function | |
71 | # will be entered after context-function returns (LR register) | |
72 | adr x1, finish | |
b32b8144 | 73 | str x1, [x0, #0x98] |
7c673cae FG |
74 | |
75 | ret x30 // return pointer to context-data (x0) | |
76 | ||
77 | finish: | |
78 | # exit code is zero | |
79 | mov x0, #0 | |
80 | # exit application | |
81 | bl _exit | |
82 | ||
83 | .size make_fcontext,.-make_fcontext | |
84 | # Mark that we don't need executable stack. | |
85 | .section .note.GNU-stack,"",%progbits |