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849e84dd | 1 | /* PLT trampolines. ARM version. |
b168057a | 2 | Copyright (C) 2005-2015 Free Software Foundation, Inc. |
849e84dd PB |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
849e84dd | 18 | |
365261c3 RH |
19 | /* ??? Needs more rearrangement for the LDM to handle thumb mode. */ |
20 | #define NO_THUMB | |
849e84dd PB |
21 | #include <sysdep.h> |
22 | #include <libc-symbols.h> | |
23 | ||
849e84dd PB |
24 | .text |
25 | .globl _dl_runtime_resolve | |
26 | .type _dl_runtime_resolve, #function | |
f4564ff0 | 27 | CFI_SECTIONS |
849e84dd PB |
28 | cfi_startproc |
29 | .align 2 | |
30 | _dl_runtime_resolve: | |
31 | cfi_adjust_cfa_offset (4) | |
32 | cfi_rel_offset (lr, 0) | |
33 | ||
34 | @ we get called with | |
35 | @ stack[0] contains the return address from this call | |
36 | @ ip contains &GOT[n+3] (pointer to function) | |
37 | @ lr points to &GOT[2] | |
38 | ||
39 | @ Save arguments. We save r4 to realign the stack. | |
55668624 | 40 | push {r0-r4} |
849e84dd PB |
41 | cfi_adjust_cfa_offset (20) |
42 | cfi_rel_offset (r0, 0) | |
43 | cfi_rel_offset (r1, 4) | |
44 | cfi_rel_offset (r2, 8) | |
45 | cfi_rel_offset (r3, 12) | |
46 | ||
47 | @ get pointer to linker struct | |
48 | ldr r0, [lr, #-4] | |
49 | ||
50 | @ prepare to call _dl_fixup() | |
51 | @ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each | |
52 | sub r1, ip, lr | |
53 | sub r1, r1, #4 | |
54 | add r1, r1, r1 | |
55 | ||
56 | @ call fixup routine | |
57 | bl _dl_fixup | |
58 | ||
59 | @ save the return | |
60 | mov ip, r0 | |
61 | ||
62 | @ get arguments and return address back. We restore r4 | |
63 | @ only to realign the stack. | |
55668624 | 64 | pop {r0-r4,lr} |
849e84dd PB |
65 | cfi_adjust_cfa_offset (-24) |
66 | ||
67 | @ jump to the newly found address | |
68 | BX(ip) | |
69 | ||
70 | cfi_endproc | |
71 | .size _dl_runtime_resolve, .-_dl_runtime_resolve | |
72 | ||
609908d7 | 73 | #ifndef PROF |
849e84dd PB |
74 | .globl _dl_runtime_profile |
75 | .type _dl_runtime_profile, #function | |
f4564ff0 | 76 | CFI_SECTIONS |
849e84dd PB |
77 | cfi_startproc |
78 | .align 2 | |
79 | _dl_runtime_profile: | |
80 | cfi_adjust_cfa_offset (4) | |
81 | cfi_rel_offset (lr, 0) | |
82 | ||
83 | @ we get called with | |
84 | @ stack[0] contains the return address from this call | |
85 | @ ip contains &GOT[n+3] (pointer to function) | |
86 | @ lr points to &GOT[2] | |
87 | ||
88 | @ Stack layout: | |
89 | @ 212 - saved lr | |
90 | @ 208 - framesize returned from pltenter | |
91 | @ 16 - La_arm_regs | |
92 | @ 8 - Saved two arguments to _dl_profile_fixup | |
93 | @ 4 - Saved result of _dl_profile_fixup | |
94 | @ 0 - outgoing argument to _dl_profile_fixup | |
95 | @ For now, we only save the general purpose registers. | |
96 | ||
97 | sub sp, sp, #196 | |
98 | cfi_adjust_cfa_offset (196) | |
99 | stmia sp, {r0-r3} | |
100 | cfi_rel_offset (r0, 0) | |
101 | cfi_rel_offset (r1, 4) | |
102 | cfi_rel_offset (r2, 8) | |
103 | cfi_rel_offset (r3, 12) | |
104 | ||
105 | sub sp, sp, #16 | |
106 | cfi_adjust_cfa_offset (16) | |
107 | ||
108 | @ Save sp and lr. | |
109 | add r0, sp, #216 | |
110 | str r0, [sp, #32] | |
111 | ldr r2, [sp, #212] | |
112 | str r2, [sp, #36] | |
113 | ||
114 | @ get pointer to linker struct | |
115 | ldr r0, [lr, #-4] | |
116 | ||
117 | @ prepare to call _dl_profile_fixup() | |
118 | @ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each | |
119 | sub r1, ip, lr | |
120 | sub r1, r1, #4 | |
121 | add r1, r1, r1 | |
122 | ||
123 | @ Save these two arguments for pltexit. | |
124 | add r3, sp, #8 | |
125 | stmia r3!, {r0,r1} | |
126 | ||
127 | @ Set up extra args for _dl_profile_fixup. | |
128 | @ r2 and r3 are already loaded. | |
129 | add ip, sp, #208 | |
130 | str ip, [sp, #0] | |
131 | ||
132 | @ call profiling fixup routine | |
133 | bl _dl_profile_fixup | |
134 | ||
135 | @ The address to call is now in r0. | |
136 | ||
137 | @ Check whether we're wrapping this function. | |
138 | ldr ip, [sp, #208] | |
139 | cmp ip, #0 | |
140 | bge 1f | |
141 | cfi_remember_state | |
142 | ||
143 | @ save the return | |
144 | mov ip, r0 | |
145 | ||
146 | @ get arguments and return address back | |
147 | add sp, sp, #16 | |
148 | cfi_adjust_cfa_offset (-16) | |
149 | ldmia sp, {r0-r3,sp,lr} | |
150 | cfi_adjust_cfa_offset (-200) | |
151 | ||
152 | @ jump to the newly found address | |
153 | BX(ip) | |
154 | ||
155 | cfi_restore_state | |
156 | 1: | |
157 | @ The new frame size is in ip. | |
158 | ||
159 | @ New stack layout: | |
160 | @ 268 - saved r7 | |
161 | @ 264 - saved result of _dl_profile_fixup | |
162 | @ 72 - La_arm_regs | |
163 | @ 64 - Saved two arguments to _dl_profile_fixup | |
164 | @ 0 - La_arm_retval | |
165 | @ For now, we only save the general purpose registers. | |
166 | ||
167 | @ Build the new frame. | |
168 | str r7, [sp, #212] | |
169 | cfi_rel_offset (r7, 212) | |
170 | sub r7, sp, #56 | |
171 | cfi_def_cfa_register (r7) | |
172 | cfi_adjust_cfa_offset (56) | |
173 | sub sp, sp, ip | |
174 | bic sp, sp, #7 | |
175 | ||
176 | @ Save the _dl_profile_fixup result around the call to memcpy. | |
177 | str r0, [r7, #264] | |
178 | ||
179 | @ Copy the stack arguments. | |
180 | mov r0, sp | |
181 | add r1, r7, #272 | |
182 | mov r2, ip | |
183 | bl memcpy | |
184 | ||
185 | @ Call the function. | |
186 | add ip, r7, #72 | |
187 | ldmia ip, {r0-r3} | |
188 | ldr ip, [r7, #264] | |
46dede0c | 189 | BLX(ip) |
849e84dd PB |
190 | stmia r7, {r0-r3} |
191 | ||
192 | @ Call pltexit. | |
193 | add ip, r7, #64 | |
194 | ldmia ip, {r0,r1} | |
195 | add r2, r7, #72 | |
196 | add r3, r7, #0 | |
197 | bl _dl_call_pltexit | |
198 | ||
199 | @ Return to caller. | |
200 | ldmia r7, {r0-r3} | |
201 | mov sp, r7 | |
202 | cfi_def_cfa_register (sp) | |
203 | ldr r7, [sp, #268] | |
204 | ldr lr, [sp, #92] | |
205 | add sp, sp, #272 | |
206 | cfi_adjust_cfa_offset (-272) | |
207 | BX(lr) | |
208 | ||
209 | cfi_endproc | |
609908d7 PB |
210 | .size _dl_runtime_profile, .-_dl_runtime_profile |
211 | #endif | |
849e84dd | 212 | .previous |