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1/* Thread-local storage handling in the ELF dynamic linker.
2 AArch64 version.
3 Copyright (C) 2011-2019 Free Software Foundation, Inc.
4
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library 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 GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21#include <sysdep.h>
22#include <tls.h>
23#include "tlsdesc.h"
24
25#define NSAVEDQREGPAIRS 16
26#define SAVE_Q_REGISTERS \
27 stp q0, q1, [sp, #-32*NSAVEDQREGPAIRS]!; \
28 cfi_adjust_cfa_offset (32*NSAVEDQREGPAIRS); \
29 stp q2, q3, [sp, #32*1]; \
30 stp q4, q5, [sp, #32*2]; \
31 stp q6, q7, [sp, #32*3]; \
32 stp q8, q9, [sp, #32*4]; \
33 stp q10, q11, [sp, #32*5]; \
34 stp q12, q13, [sp, #32*6]; \
35 stp q14, q15, [sp, #32*7]; \
36 stp q16, q17, [sp, #32*8]; \
37 stp q18, q19, [sp, #32*9]; \
38 stp q20, q21, [sp, #32*10]; \
39 stp q22, q23, [sp, #32*11]; \
40 stp q24, q25, [sp, #32*12]; \
41 stp q26, q27, [sp, #32*13]; \
42 stp q28, q29, [sp, #32*14]; \
43 stp q30, q31, [sp, #32*15];
44
45#define RESTORE_Q_REGISTERS \
46 ldp q2, q3, [sp, #32*1]; \
47 ldp q4, q5, [sp, #32*2]; \
48 ldp q6, q7, [sp, #32*3]; \
49 ldp q8, q9, [sp, #32*4]; \
50 ldp q10, q11, [sp, #32*5]; \
51 ldp q12, q13, [sp, #32*6]; \
52 ldp q14, q15, [sp, #32*7]; \
53 ldp q16, q17, [sp, #32*8]; \
54 ldp q18, q19, [sp, #32*9]; \
55 ldp q20, q21, [sp, #32*10]; \
56 ldp q22, q23, [sp, #32*11]; \
57 ldp q24, q25, [sp, #32*12]; \
58 ldp q26, q27, [sp, #32*13]; \
59 ldp q28, q29, [sp, #32*14]; \
60 ldp q30, q31, [sp, #32*15]; \
61 ldp q0, q1, [sp], #32*NSAVEDQREGPAIRS; \
62 cfi_adjust_cfa_offset (-32*NSAVEDQREGPAIRS);
63
64 .text
65
66 /* Compute the thread pointer offset for symbols in the static
67 TLS block. The offset is the same for all threads.
68 Prototype:
69 _dl_tlsdesc_return (tlsdesc *) ;
70 */
71 .hidden _dl_tlsdesc_return
72 .global _dl_tlsdesc_return
73 .type _dl_tlsdesc_return,%function
74 cfi_startproc
75 .align 2
76_dl_tlsdesc_return:
77 DELOUSE (0)
78 ldr PTR_REG (0), [x0, #PTR_SIZE]
79 RET
80 cfi_endproc
81 .size _dl_tlsdesc_return, .-_dl_tlsdesc_return
82
83 /* Handler for undefined weak TLS symbols.
84 Prototype:
85 _dl_tlsdesc_undefweak (tlsdesc *);
86
87 The second word of the descriptor contains the addend.
88 Return the addend minus the thread pointer. This ensures
89 that when the caller adds on the thread pointer it gets back
90 the addend. */
91
92 .hidden _dl_tlsdesc_undefweak
93 .global _dl_tlsdesc_undefweak
94 .type _dl_tlsdesc_undefweak,%function
95 cfi_startproc
96 .align 2
97_dl_tlsdesc_undefweak:
98 str x1, [sp, #-16]!
99 cfi_adjust_cfa_offset (16)
100 DELOUSE (0)
101 ldr PTR_REG (0), [x0, #PTR_SIZE]
102 mrs x1, tpidr_el0
103 sub PTR_REG (0), PTR_REG (0), PTR_REG (1)
104 ldr x1, [sp], #16
105 cfi_adjust_cfa_offset (-16)
106 RET
107 cfi_endproc
108 .size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
109
110#ifdef SHARED
111 /* Handler for dynamic TLS symbols.
112 Prototype:
113 _dl_tlsdesc_dynamic (tlsdesc *) ;
114
115 The second word of the descriptor points to a
116 tlsdesc_dynamic_arg structure.
117
118 Returns the offset between the thread pointer and the
119 object referenced by the argument.
120
121 ptrdiff_t
122 __attribute__ ((__regparm__ (1)))
123 _dl_tlsdesc_dynamic (struct tlsdesc *tdp)
124 {
125 struct tlsdesc_dynamic_arg *td = tdp->arg;
126 dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + TCBHEAD_DTV);
127 if (__builtin_expect (td->gen_count <= dtv[0].counter
128 && (dtv[td->tlsinfo.ti_module].pointer.val
129 != TLS_DTV_UNALLOCATED),
130 1))
131 return dtv[td->tlsinfo.ti_module].pointer.val
132 + td->tlsinfo.ti_offset
133 - __thread_pointer;
134
135 return ___tls_get_addr (&td->tlsinfo) - __thread_pointer;
136 }
137 */
138
139 .hidden _dl_tlsdesc_dynamic
140 .global _dl_tlsdesc_dynamic
141 .type _dl_tlsdesc_dynamic,%function
142 cfi_startproc
143 .align 2
144_dl_tlsdesc_dynamic:
145 DELOUSE (0)
146
147 /* Save just enough registers to support fast path, if we fall
148 into slow path we will save additional registers. */
149 stp x1, x2, [sp, #-32]!
150 stp x3, x4, [sp, #16]
151 cfi_adjust_cfa_offset (32)
152 cfi_rel_offset (x1, 0)
153 cfi_rel_offset (x2, 8)
154 cfi_rel_offset (x3, 16)
155 cfi_rel_offset (x4, 24)
156
157 mrs x4, tpidr_el0
158 ldr PTR_REG (1), [x0,#TLSDESC_ARG]
159 ldr PTR_REG (0), [x4,#TCBHEAD_DTV]
160 ldr PTR_REG (3), [x1,#TLSDESC_GEN_COUNT]
161 ldr PTR_REG (2), [x0,#DTV_COUNTER]
162 cmp PTR_REG (3), PTR_REG (2)
163 b.hi 2f
164 /* Load r2 = td->tlsinfo.ti_module and r3 = td->tlsinfo.ti_offset. */
165 ldp PTR_REG (2), PTR_REG (3), [x1,#TLSDESC_MODID]
166 add PTR_REG (0), PTR_REG (0), PTR_REG (2), lsl #(PTR_LOG_SIZE + 1)
167 ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */
168 cmp PTR_REG (0), #TLS_DTV_UNALLOCATED
169 b.eq 2f
170 sub PTR_REG (3), PTR_REG (3), PTR_REG (4)
171 add PTR_REG (0), PTR_REG (0), PTR_REG (3)
1721:
173 ldp x3, x4, [sp, #16]
174 ldp x1, x2, [sp], #32
175 cfi_adjust_cfa_offset (-32)
176 RET
1772:
178 /* This is the slow path. We need to call __tls_get_addr() which
179 means we need to save and restore all the register that the
180 callee will trash. */
181
182 /* Save the remaining registers that we must treat as caller save. */
183# define NSAVEXREGPAIRS 8
184 stp x29, x30, [sp,#-16*NSAVEXREGPAIRS]!
185 cfi_adjust_cfa_offset (16*NSAVEXREGPAIRS)
186 cfi_rel_offset (x29, 0)
187 cfi_rel_offset (x30, 8)
188 mov x29, sp
189 stp x5, x6, [sp, #16*1]
190 stp x7, x8, [sp, #16*2]
191 stp x9, x10, [sp, #16*3]
192 stp x11, x12, [sp, #16*4]
193 stp x13, x14, [sp, #16*5]
194 stp x15, x16, [sp, #16*6]
195 stp x17, x18, [sp, #16*7]
196 cfi_rel_offset (x5, 16*1)
197 cfi_rel_offset (x6, 16*1+8)
198 cfi_rel_offset (x7, 16*2)
199 cfi_rel_offset (x8, 16*2+8)
200 cfi_rel_offset (x9, 16*3)
201 cfi_rel_offset (x10, 16*3+8)
202 cfi_rel_offset (x11, 16*4)
203 cfi_rel_offset (x12, 16*4+8)
204 cfi_rel_offset (x13, 16*5)
205 cfi_rel_offset (x14, 16*5+8)
206 cfi_rel_offset (x15, 16*6)
207 cfi_rel_offset (x16, 16*6+8)
208 cfi_rel_offset (x17, 16*7)
209 cfi_rel_offset (x18, 16*7+8)
210
211 SAVE_Q_REGISTERS
212
213 mov x0, x1
214 bl __tls_get_addr
215
216 mrs x1, tpidr_el0
217 sub PTR_REG (0), PTR_REG (0), PTR_REG (1)
218
219 RESTORE_Q_REGISTERS
220
221 ldp x5, x6, [sp, #16*1]
222 ldp x7, x8, [sp, #16*2]
223 ldp x9, x10, [sp, #16*3]
224 ldp x11, x12, [sp, #16*4]
225 ldp x13, x14, [sp, #16*5]
226 ldp x15, x16, [sp, #16*6]
227 ldp x17, x18, [sp, #16*7]
228
229 ldp x29, x30, [sp], #16*NSAVEXREGPAIRS
230 cfi_adjust_cfa_offset (-16*NSAVEXREGPAIRS)
231 cfi_restore (x29)
232 cfi_restore (x30)
233 b 1b
234 cfi_endproc
235 .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
236# undef NSAVEXREGPAIRS
237#endif
238

Warning: That file was not part of the compilation database. It may have many parsing errors.