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7c673cae FG |
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 | ||
b32b8144 FG |
8 | /******************************************************* |
9 | * * | |
10 | * ------------------------------------------------- * | |
11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
12 | * ------------------------------------------------- * | |
13 | * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | * | |
14 | * ------------------------------------------------- * | |
15 | * | F20 | F22 | F24 | F26 | * | |
16 | * ------------------------------------------------- * | |
17 | * ------------------------------------------------- * | |
18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
19 | * ------------------------------------------------- * | |
20 | * | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | * | |
21 | * ------------------------------------------------- * | |
22 | * | F28 | F30 | S0 | S1 | S2 | S3 | * | |
23 | * ------------------------------------------------- * | |
24 | * ------------------------------------------------- * | |
25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
26 | * ------------------------------------------------- * | |
27 | * | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | * | |
28 | * ------------------------------------------------- * | |
29 | * | S4 | S5 | S6 | S7 | FP |hiddn| RA | PC | * | |
30 | * ------------------------------------------------- * | |
31 | * ------------------------------------------------- * | |
32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
33 | * ------------------------------------------------- * | |
34 | * | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | * | |
35 | * ------------------------------------------------- * | |
11fdf7f2 | 36 | * | ABI ARGS | GP | FCTX| DATA| | * |
b32b8144 FG |
37 | * ------------------------------------------------- * |
38 | * * | |
39 | * *****************************************************/ | |
7c673cae | 40 | |
92f5a8d4 | 41 | .file "make_mips32_o32_elf_gas.S" |
7c673cae FG |
42 | .text |
43 | .globl make_fcontext | |
44 | .align 2 | |
45 | .type make_fcontext,@function | |
46 | .ent make_fcontext | |
47 | make_fcontext: | |
48 | #ifdef __PIC__ | |
49 | .set noreorder | |
50 | .cpload $t9 | |
51 | .set reorder | |
52 | #endif | |
7c673cae | 53 | # shift address in A0 to lower 16 byte boundary |
11fdf7f2 TL |
54 | li $v1, -16 # 0xfffffffffffffff0 |
55 | and $v0, $v1, $a0 | |
7c673cae FG |
56 | |
57 | # reserve space for context-data on context-stack | |
11fdf7f2 TL |
58 | # includes an extra 32 bytes for: |
59 | # - 16-byte incoming argument area required by mips ABI used when | |
60 | # jump_context calls the initial function | |
61 | # - 4 bytes to save our GP register used in finish | |
62 | # - 8 bytes to as space for transfer_t returned to finish | |
63 | # - 4 bytes for alignment | |
64 | addiu $v0, $v0, -128 | |
7c673cae FG |
65 | |
66 | # third arg of make_fcontext() == address of context-function | |
b32b8144 | 67 | sw $a2, 92($v0) |
7c673cae | 68 | # save global pointer in context-data |
11fdf7f2 | 69 | sw $gp, 112($v0) |
7c673cae FG |
70 | |
71 | # compute address of returned transfer_t | |
11fdf7f2 | 72 | addiu $t0, $v0, 116 |
b32b8144 | 73 | sw $t0, 84($v0) |
7c673cae FG |
74 | |
75 | # compute abs address of label finish | |
76 | la $t9, finish | |
77 | # save address of finish as return-address for context-function | |
78 | # will be entered after context-function returns | |
b32b8144 | 79 | sw $t9, 88($v0) |
7c673cae FG |
80 | |
81 | jr $ra # return pointer to context-data | |
82 | ||
83 | finish: | |
11fdf7f2 TL |
84 | # reload our gp register (needed for la) |
85 | lw $gp, 16($sp) | |
7c673cae | 86 | |
11fdf7f2 TL |
87 | # call _exit(0) |
88 | # the previous function should have left the 16 bytes incoming argument | |
89 | # area on the stack which we reuse for calling _exit | |
90 | la $t9, _exit | |
91 | move $a0, $zero | |
92 | jr $t9 | |
7c673cae FG |
93 | .end make_fcontext |
94 | .size make_fcontext, .-make_fcontext | |
95 | ||
96 | /* Mark that we don't need executable stack. */ | |
97 | .section .note.GNU-stack,"",%progbits |