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29d73ae4 DJ |
1 | /* Unwinder test program. |
2 | ||
b811d2c2 | 3 | Copyright 2006-2020 Free Software Foundation, Inc. |
29d73ae4 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
29d73ae4 | 10 | (at your option) any later version. |
a9762ec7 | 11 | |
29d73ae4 DJ |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
a9762ec7 | 16 | |
29d73ae4 | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
29d73ae4 DJ |
19 | |
20 | void tpcs_frame (void); | |
72a2e3dc MI |
21 | void switch_stack_to_same (void); |
22 | void switch_stack_to_other (void); | |
29d73ae4 DJ |
23 | |
24 | int | |
25 | main (void) | |
26 | { | |
27 | tpcs_frame (); | |
72a2e3dc MI |
28 | switch_stack_to_same (); |
29 | switch_stack_to_other (); | |
29d73ae4 DJ |
30 | return 0; |
31 | } | |
32 | ||
33 | /* Normally Thumb functions use r7 as the frame pointer. However, | |
fd20f75b DJ |
34 | with the GCC option -mtpcs-frame, they may use fp instead. Make |
35 | sure that the prologue analyzer can handle this. */ | |
29d73ae4 DJ |
36 | |
37 | asm(".text\n" | |
38 | " .align 2\n" | |
39 | " .thumb_func\n" | |
40 | " .code 16\n" | |
41 | "tpcs_frame_1:\n" | |
42 | " sub sp, #16\n" | |
43 | " push {r7}\n" | |
44 | " add r7, sp, #20\n" | |
45 | " str r7, [sp, #8]\n" | |
46 | " mov r7, pc\n" | |
47 | " str r7, [sp, #16]\n" | |
48 | " mov r7, fp\n" | |
49 | " str r7, [sp, #4]\n" | |
50 | " mov r7, lr\n" | |
51 | " str r7, [sp, #12]\n" | |
52 | " add r7, sp, #16\n" | |
53 | " mov fp, r7\n" | |
54 | " mov r7, sl\n" | |
55 | " push {r7}\n" | |
56 | ||
fd20f75b DJ |
57 | /* We'll set a breakpoint at this call. We can't hardcode a trap |
58 | instruction; the right instruction to use varies too much. And | |
59 | we can't use a global label, because GDB will think that's the | |
60 | start of a new function. So, this slightly convoluted | |
61 | technique. */ | |
62 | ".Ltpcs:\n" | |
63 | " nop\n" | |
29d73ae4 DJ |
64 | |
65 | " pop {r2}\n" | |
66 | " mov sl, r2\n" | |
67 | " pop {r7}\n" | |
68 | " pop {r1, r2}\n" | |
69 | " mov fp, r1\n" | |
70 | " mov sp, r2\n" | |
71 | " bx lr\n" | |
72 | ||
fd20f75b DJ |
73 | " .align 2\n" |
74 | " .type tpcs_offset, %object\n" | |
75 | "tpcs_offset:\n" | |
76 | " .word .Ltpcs - tpcs_frame_1\n" | |
77 | ||
29d73ae4 DJ |
78 | " .align 2\n" |
79 | " .thumb_func\n" | |
80 | " .code 16\n" | |
81 | "tpcs_frame:\n" | |
82 | " sub sp, #16\n" | |
83 | " push {r7}\n" | |
84 | " add r7, sp, #20\n" | |
85 | " str r7, [sp, #8]\n" | |
86 | " mov r7, pc\n" | |
87 | " str r7, [sp, #16]\n" | |
88 | " mov r7, fp\n" | |
89 | " str r7, [sp, #4]\n" | |
90 | " mov r7, lr\n" | |
91 | " str r7, [sp, #12]\n" | |
92 | " add r7, sp, #16\n" | |
93 | " mov fp, r7\n" | |
94 | " mov r7, sl\n" | |
95 | " push {r7}\n" | |
96 | ||
fd20f75b | 97 | /* Clobber saved regs around the call. */ |
29d73ae4 DJ |
98 | " mov r7, #0\n" |
99 | " mov lr, r7\n" | |
100 | " bl tpcs_frame_1\n" | |
101 | ||
102 | " pop {r2}\n" | |
103 | " mov sl, r2\n" | |
104 | " pop {r7}\n" | |
fd20f75b | 105 | " pop {r1, r2, r3}\n" |
29d73ae4 DJ |
106 | " mov fp, r1\n" |
107 | " mov sp, r2\n" | |
fd20f75b | 108 | " mov lr, r3\n" |
29d73ae4 DJ |
109 | " bx lr\n" |
110 | ); | |
72a2e3dc MI |
111 | |
112 | asm(".text\n" | |
113 | " .align 2\n" | |
114 | " .thumb_func\n" | |
115 | " .code 16\n" | |
116 | "write_sp:\n" | |
117 | " mov sp, r0\n" | |
118 | " bx lr\n" | |
119 | ||
120 | " .align 2\n" | |
121 | " .thumb_func\n" | |
122 | " .code 16\n" | |
123 | "switch_stack_to_same:\n" | |
124 | " push {lr}\n" | |
125 | " mov r0, sp\n" | |
126 | " bl write_sp\n" | |
127 | " pop {r1}\n" | |
128 | " bx r1\n" | |
129 | ||
130 | " .align 2\n" | |
131 | " .thumb_func\n" | |
132 | " .code 16\n" | |
133 | "switch_stack_to_other:\n" | |
134 | " push {lr}\n" | |
135 | " mov r7, sp\n" | |
136 | " mov r0, #128\n" | |
137 | " bl write_sp\n" | |
138 | " mov sp, r7\n" | |
139 | " pop {r1}\n" | |
140 | " bx r1\n"); |