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3447f0d7 | 1 | /* Thread-local storage handling in the ELF dynamic linker. ARM version. |
2b778ceb | 2 | Copyright (C) 2006-2021 Free Software Foundation, Inc. |
3447f0d7 NS |
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 | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
3447f0d7 NS |
18 | |
19 | #include <sysdep.h> | |
6bcae146 | 20 | #include <arm-features.h> |
3447f0d7 NS |
21 | #include <tls.h> |
22 | #include "tlsdesc.h" | |
23 | ||
3447f0d7 NS |
24 | .text |
25 | @ emit debug information with cfi | |
26 | @ use arm-specific pseudos for unwinding itself | |
f4564ff0 | 27 | CFI_SECTIONS |
3447f0d7 NS |
28 | .hidden _dl_tlsdesc_return |
29 | .global _dl_tlsdesc_return | |
30 | .type _dl_tlsdesc_return,#function | |
31 | cfi_startproc | |
7214d558 | 32 | eabi_fnstart |
3447f0d7 NS |
33 | .align 2 |
34 | _dl_tlsdesc_return: | |
81cb7a0b | 35 | ldr r0, [r0] |
3447f0d7 | 36 | BX (lr) |
7214d558 | 37 | eabi_fnend |
3447f0d7 NS |
38 | cfi_endproc |
39 | .size _dl_tlsdesc_return, .-_dl_tlsdesc_return | |
40 | ||
41 | .hidden _dl_tlsdesc_undefweak | |
42 | .global _dl_tlsdesc_undefweak | |
43 | .type _dl_tlsdesc_undefweak,#function | |
44 | cfi_startproc | |
7214d558 | 45 | eabi_fnstart |
3447f0d7 NS |
46 | .align 2 |
47 | _dl_tlsdesc_undefweak: | |
5232b909 | 48 | GET_TLS (r1) |
3447f0d7 | 49 | rsb r0, r0, #0 |
3447f0d7 | 50 | BX (lr) |
3447f0d7 | 51 | cfi_endproc |
7214d558 | 52 | eabi_fnend |
3447f0d7 NS |
53 | .size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak |
54 | ||
55 | #ifdef SHARED | |
56 | .hidden _dl_tlsdesc_dynamic | |
57 | .global _dl_tlsdesc_dynamic | |
58 | .type _dl_tlsdesc_dynamic,#function | |
59 | ||
60 | ||
61 | /* | |
62 | The assembly code that follows is a rendition of the following | |
63 | C code, hand-optimized a little bit. | |
64 | ||
65 | ptrdiff_t | |
66 | _dl_tlsdesc_dynamic(struct tlsdesc *tdp) | |
67 | { | |
68 | struct tlsdesc_dynamic_arg *td = tdp->argument.pointer; | |
69 | dtv_t *dtv = (dtv_t *)THREAD_DTV(); | |
70 | if (__builtin_expect (td->gen_count <= dtv[0].counter | |
71 | && dtv[td->tlsinfo.ti_module].pointer.val | |
72 | != TLS_DTV_UNALLOCATED, | |
73 | 1)) | |
74 | return dtv[td->tlsinfo.ti_module].pointer.val + | |
75 | td->tlsinfo.ti_offset - __builtin_thread_pointer(); | |
76 | ||
77 | return __tls_get_addr (&td->tlsinfo) - __builtin_thread_pointer(); | |
78 | } | |
79 | ||
80 | */ | |
81 | cfi_startproc | |
7214d558 | 82 | eabi_fnstart |
3447f0d7 NS |
83 | .align 2 |
84 | _dl_tlsdesc_dynamic: | |
85 | /* Our calling convention is to clobber r0, r1 and the processor | |
86 | flags. All others that are modified must be saved */ | |
7214d558 | 87 | eabi_save ({r2,r3,r4,lr}) |
55668624 | 88 | push {r2,r3,r4,lr} |
3447f0d7 NS |
89 | cfi_adjust_cfa_offset (16) |
90 | cfi_rel_offset (r2,0) | |
91 | cfi_rel_offset (r3,4) | |
92 | cfi_rel_offset (r4,8) | |
93 | cfi_rel_offset (lr,12) | |
81cb7a0b | 94 | ldr r1, [r0] /* td */ |
5232b909 | 95 | GET_TLS (lr) |
3447f0d7 | 96 | mov r4, r0 /* r4 = tp */ |
81cb7a0b ZW |
97 | ldr r0, [r0] |
98 | ldr r2, [r1, #8] /* gen_count */ | |
99 | ldr r3, [r0] | |
3447f0d7 NS |
100 | cmp r2, r3 |
101 | bhi 1f | |
81cb7a0b | 102 | ldr r3, [r1] |
6bcae146 | 103 | #ifndef ARM_NO_INDEX_REGISTER |
3447f0d7 | 104 | ldr r2, [r0, r3, lsl #3] |
6bcae146 RM |
105 | #else |
106 | add lr, r0, r3, lsl #3 | |
81cb7a0b | 107 | ldr r2, [lr] |
6bcae146 | 108 | #endif |
3447f0d7 | 109 | cmn r2, #1 |
6ccd0107 | 110 | ittt ne |
3447f0d7 NS |
111 | ldrne r3, [r1, #4] |
112 | addne r3, r2, r3 | |
113 | rsbne r0, r4, r3 | |
114 | bne 2f | |
115 | 1: mov r0, r1 | |
116 | bl __tls_get_addr | |
117 | rsb r0, r4, r0 | |
d137b6dc | 118 | 2: |
6bcae146 RM |
119 | #if ((defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)) \ |
120 | || defined (ARM_ALWAYS_BX)) | |
d137b6dc | 121 | pop {r2,r3,r4, lr} |
3447f0d7 NS |
122 | cfi_adjust_cfa_offset (-16) |
123 | cfi_restore (lr) | |
124 | cfi_restore (r4) | |
125 | cfi_restore (r3) | |
126 | cfi_restore (r2) | |
d137b6dc RH |
127 | bx lr |
128 | #else | |
129 | pop {r2,r3,r4, pc} | |
130 | #endif | |
7214d558 | 131 | eabi_fnend |
3447f0d7 NS |
132 | cfi_endproc |
133 | .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic | |
134 | #endif /* SHARED */ |