1 | /* Save current context. |
2 | Copyright (C) 2002-2024 Free Software Foundation, Inc. |
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 |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sysdep.h> |
20 | #include <rtld-global-offsets.h> |
21 | #include <shlib-compat.h> |
22 | |
23 | #define __ASSEMBLY__ |
24 | #include <asm/ptrace.h> |
25 | #include <asm/errno.h> |
26 | #include "ucontext_i.h" |
27 | |
28 | |
29 | #if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4) |
30 | ENTRY(__novec_getcontext) |
31 | CALL_MCOUNT 1 |
32 | std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3) |
33 | std r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3) |
34 | mflr r0 |
35 | std r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3) |
36 | std r0,FRAME_LR_SAVE(r1) |
37 | cfi_offset (lr, FRAME_LR_SAVE) |
38 | std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3) |
39 | std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3) |
40 | stdu r1,-128(r1) |
41 | cfi_adjust_cfa_offset (128) |
42 | std r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r3) |
43 | std r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r3) |
44 | std r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r3) |
45 | std r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r3) |
46 | std r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r3) |
47 | std r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r3) |
48 | std r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r3) |
49 | std r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r3) |
50 | std r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r3) |
51 | std r13,(SIGCONTEXT_GP_REGS+(PT_R13*8))(r3) |
52 | std r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r3) |
53 | std r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r3) |
54 | std r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r3) |
55 | std r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r3) |
56 | std r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r3) |
57 | std r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r3) |
58 | std r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r3) |
59 | std r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r3) |
60 | std r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r3) |
61 | std r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r3) |
62 | std r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r3) |
63 | std r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r3) |
64 | std r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r3) |
65 | std r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r3) |
66 | std r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r3) |
67 | std r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r3) |
68 | std r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r3) |
69 | std r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r3) |
70 | mfctr r0 |
71 | std r0,(SIGCONTEXT_GP_REGS+(PT_CTR*8))(r3) |
72 | mfxer r0 |
73 | std r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r3) |
74 | mfcr r0 |
75 | std r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r3) |
76 | |
77 | /* Set the return value of swapcontext to "success". R3 is the only |
78 | register whose value is not preserved in the saved context. */ |
79 | li r0,0 |
80 | std r0,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r3) |
81 | |
82 | /* Zero fill fields that can't be set in user state or are unused. */ |
83 | std r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r3) |
84 | std r0,(SIGCONTEXT_GP_REGS+(34*8))(r3) |
85 | std r0,(SIGCONTEXT_GP_REGS+(PT_SOFTE*8))(r3) |
86 | std r0,(SIGCONTEXT_GP_REGS+(40*8))(r3) |
87 | std r0,(SIGCONTEXT_GP_REGS+(41*8))(r3) |
88 | std r0,(SIGCONTEXT_GP_REGS+(42*8))(r3) |
89 | std r0,(SIGCONTEXT_GP_REGS+(PT_RESULT*8))(r3) |
90 | |
91 | /* Set the PT_REGS pointer to the address of sigcontext's gp_regs |
92 | field. Struct pt_regs and elf_gregset_t are the same thing. |
93 | We kept the regs field for backwards compatibility with |
94 | libraries built before we extended sigcontext. */ |
95 | addi r0,r3,SIGCONTEXT_GP_REGS |
96 | std r0,SIGCONTEXT_PT_REGS(r3) |
97 | |
98 | stfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r3) |
99 | stfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r3) |
100 | stfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r3) |
101 | stfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r3) |
102 | stfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r3) |
103 | stfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r3) |
104 | stfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r3) |
105 | stfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r3) |
106 | stfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r3) |
107 | stfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r3) |
108 | stfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r3) |
109 | stfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r3) |
110 | stfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r3) |
111 | stfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r3) |
112 | stfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r3) |
113 | stfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r3) |
114 | stfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r3) |
115 | stfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r3) |
116 | stfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r3) |
117 | stfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r3) |
118 | stfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r3) |
119 | stfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r3) |
120 | stfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r3) |
121 | stfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r3) |
122 | stfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r3) |
123 | stfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r3) |
124 | stfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r3) |
125 | stfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r3) |
126 | stfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r3) |
127 | stfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r3) |
128 | mffs fp0 |
129 | stfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r3) |
130 | stfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r3) |
131 | stfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r3) |
132 | |
133 | addi r5,r3,UCONTEXT_SIGMASK |
134 | li r4,0 |
135 | li r3,SIG_BLOCK |
136 | bl JUMPTARGET(__sigprocmask) |
137 | nop |
138 | |
139 | ld r0,128+FRAME_LR_SAVE(r1) |
140 | addi r1,r1,128 |
141 | mtlr r0 |
142 | blr |
143 | PSEUDO_END(__novec_getcontext) |
144 | |
145 | compat_symbol (libc, __novec_getcontext, getcontext, GLIBC_2_3) |
146 | |
147 | #endif |
148 | |
149 | .section ".toc" ,"aw" |
150 | .LC__dl_hwcap: |
151 | #ifdef SHARED |
152 | .tc _rtld_global_ro[TC],_rtld_global_ro |
153 | #else |
154 | .tc _dl_hwcap[TC],_dl_hwcap |
155 | #endif |
156 | .section ".text" |
157 | |
158 | .machine "altivec" |
159 | ENTRY(__getcontext) |
160 | CALL_MCOUNT 1 |
161 | std r0,(SIGCONTEXT_GP_REGS+(PT_R0*8))(r3) |
162 | std r1,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3) |
163 | mflr r0 |
164 | std r2,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3) |
165 | std r0,FRAME_LR_SAVE(r1) |
166 | cfi_offset (lr, FRAME_LR_SAVE) |
167 | std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3) |
168 | std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3) |
169 | stdu r1,-128(r1) |
170 | cfi_adjust_cfa_offset (128) |
171 | std r4,(SIGCONTEXT_GP_REGS+(PT_R4*8))(r3) |
172 | std r5,(SIGCONTEXT_GP_REGS+(PT_R5*8))(r3) |
173 | std r6,(SIGCONTEXT_GP_REGS+(PT_R6*8))(r3) |
174 | std r7,(SIGCONTEXT_GP_REGS+(PT_R7*8))(r3) |
175 | std r8,(SIGCONTEXT_GP_REGS+(PT_R8*8))(r3) |
176 | std r9,(SIGCONTEXT_GP_REGS+(PT_R9*8))(r3) |
177 | std r10,(SIGCONTEXT_GP_REGS+(PT_R10*8))(r3) |
178 | std r11,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r3) |
179 | std r12,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r3) |
180 | std r13,(SIGCONTEXT_GP_REGS+(PT_R13*8))(r3) |
181 | std r14,(SIGCONTEXT_GP_REGS+(PT_R14*8))(r3) |
182 | std r15,(SIGCONTEXT_GP_REGS+(PT_R15*8))(r3) |
183 | std r16,(SIGCONTEXT_GP_REGS+(PT_R16*8))(r3) |
184 | std r17,(SIGCONTEXT_GP_REGS+(PT_R17*8))(r3) |
185 | std r18,(SIGCONTEXT_GP_REGS+(PT_R18*8))(r3) |
186 | std r19,(SIGCONTEXT_GP_REGS+(PT_R19*8))(r3) |
187 | std r20,(SIGCONTEXT_GP_REGS+(PT_R20*8))(r3) |
188 | std r21,(SIGCONTEXT_GP_REGS+(PT_R21*8))(r3) |
189 | std r22,(SIGCONTEXT_GP_REGS+(PT_R22*8))(r3) |
190 | std r23,(SIGCONTEXT_GP_REGS+(PT_R23*8))(r3) |
191 | std r24,(SIGCONTEXT_GP_REGS+(PT_R24*8))(r3) |
192 | std r25,(SIGCONTEXT_GP_REGS+(PT_R25*8))(r3) |
193 | std r26,(SIGCONTEXT_GP_REGS+(PT_R26*8))(r3) |
194 | std r27,(SIGCONTEXT_GP_REGS+(PT_R27*8))(r3) |
195 | std r28,(SIGCONTEXT_GP_REGS+(PT_R28*8))(r3) |
196 | std r29,(SIGCONTEXT_GP_REGS+(PT_R29*8))(r3) |
197 | std r30,(SIGCONTEXT_GP_REGS+(PT_R30*8))(r3) |
198 | std r31,(SIGCONTEXT_GP_REGS+(PT_R31*8))(r3) |
199 | mfctr r0 |
200 | std r0,(SIGCONTEXT_GP_REGS+(PT_CTR*8))(r3) |
201 | mfxer r0 |
202 | std r0,(SIGCONTEXT_GP_REGS+(PT_XER*8))(r3) |
203 | mfcr r0 |
204 | std r0,(SIGCONTEXT_GP_REGS+(PT_CCR*8))(r3) |
205 | |
206 | /* Set the return value of swapcontext to "success". R3 is the only |
207 | register whose value is not preserved in the saved context. */ |
208 | li r0,0 |
209 | std r0,(SIGCONTEXT_GP_REGS+(PT_R3*8))(r3) |
210 | |
211 | /* Zero fill fields that can't be set in user state or are unused. */ |
212 | std r0,(SIGCONTEXT_GP_REGS+(PT_MSR*8))(r3) |
213 | std r0,(SIGCONTEXT_GP_REGS+(34*8))(r3) |
214 | std r0,(SIGCONTEXT_GP_REGS+(PT_SOFTE*8))(r3) |
215 | std r0,(SIGCONTEXT_GP_REGS+(40*8))(r3) |
216 | std r0,(SIGCONTEXT_GP_REGS+(41*8))(r3) |
217 | std r0,(SIGCONTEXT_GP_REGS+(42*8))(r3) |
218 | std r0,(SIGCONTEXT_GP_REGS+(PT_RESULT*8))(r3) |
219 | |
220 | /* Set the PT_REGS pointer to the address of sigcontext's gp_regs |
221 | field. Struct pt_regs and elf_gregset_t are the same thing. |
222 | We kept the regs field for backwards compatibility with |
223 | libraries built before we extended sigcontext. */ |
224 | addi r0,r3,SIGCONTEXT_GP_REGS |
225 | std r0,SIGCONTEXT_PT_REGS(r3) |
226 | |
227 | stfd fp0,(SIGCONTEXT_FP_REGS+(PT_R0*8))(r3) |
228 | stfd fp1,(SIGCONTEXT_FP_REGS+(PT_R1*8))(r3) |
229 | stfd fp2,(SIGCONTEXT_FP_REGS+(PT_R2*8))(r3) |
230 | stfd fp3,(SIGCONTEXT_FP_REGS+(PT_R3*8))(r3) |
231 | stfd fp4,(SIGCONTEXT_FP_REGS+(PT_R4*8))(r3) |
232 | stfd fp5,(SIGCONTEXT_FP_REGS+(PT_R5*8))(r3) |
233 | stfd fp6,(SIGCONTEXT_FP_REGS+(PT_R6*8))(r3) |
234 | stfd fp7,(SIGCONTEXT_FP_REGS+(PT_R7*8))(r3) |
235 | stfd fp8,(SIGCONTEXT_FP_REGS+(PT_R8*8))(r3) |
236 | stfd fp9,(SIGCONTEXT_FP_REGS+(PT_R9*8))(r3) |
237 | stfd fp10,(SIGCONTEXT_FP_REGS+(PT_R10*8))(r3) |
238 | stfd fp11,(SIGCONTEXT_FP_REGS+(PT_R11*8))(r3) |
239 | stfd fp12,(SIGCONTEXT_FP_REGS+(PT_R12*8))(r3) |
240 | stfd fp13,(SIGCONTEXT_FP_REGS+(PT_R13*8))(r3) |
241 | stfd fp14,(SIGCONTEXT_FP_REGS+(PT_R14*8))(r3) |
242 | stfd fp15,(SIGCONTEXT_FP_REGS+(PT_R15*8))(r3) |
243 | stfd fp16,(SIGCONTEXT_FP_REGS+(PT_R16*8))(r3) |
244 | stfd fp17,(SIGCONTEXT_FP_REGS+(PT_R17*8))(r3) |
245 | stfd fp18,(SIGCONTEXT_FP_REGS+(PT_R18*8))(r3) |
246 | stfd fp19,(SIGCONTEXT_FP_REGS+(PT_R19*8))(r3) |
247 | stfd fp20,(SIGCONTEXT_FP_REGS+(PT_R20*8))(r3) |
248 | stfd fp21,(SIGCONTEXT_FP_REGS+(PT_R21*8))(r3) |
249 | stfd fp22,(SIGCONTEXT_FP_REGS+(PT_R22*8))(r3) |
250 | stfd fp23,(SIGCONTEXT_FP_REGS+(PT_R23*8))(r3) |
251 | stfd fp24,(SIGCONTEXT_FP_REGS+(PT_R24*8))(r3) |
252 | stfd fp25,(SIGCONTEXT_FP_REGS+(PT_R25*8))(r3) |
253 | stfd fp26,(SIGCONTEXT_FP_REGS+(PT_R26*8))(r3) |
254 | stfd fp27,(SIGCONTEXT_FP_REGS+(PT_R27*8))(r3) |
255 | stfd fp28,(SIGCONTEXT_FP_REGS+(PT_R28*8))(r3) |
256 | stfd fp29,(SIGCONTEXT_FP_REGS+(PT_R29*8))(r3) |
257 | mffs fp0 |
258 | stfd fp30,(SIGCONTEXT_FP_REGS+(PT_R30*8))(r3) |
259 | stfd fp31,(SIGCONTEXT_FP_REGS+(PT_R31*8))(r3) |
260 | stfd fp0,(SIGCONTEXT_FP_REGS+(32*8))(r3) |
261 | |
262 | ld r5,.LC__dl_hwcap@toc(r2) |
263 | # ifdef SHARED |
264 | /* Load _rtld-global._dl_hwcap. */ |
265 | ld r5,RTLD_GLOBAL_RO_DL_HWCAP_OFFSET(r5) |
266 | # else |
267 | ld r5,0(r5) /* Load extern _dl_hwcap. */ |
268 | # endif |
269 | la r10,(SIGCONTEXT_V_RESERVE+8)(r3) |
270 | la r9,(SIGCONTEXT_V_RESERVE+24)(r3) |
271 | |
272 | andis. r5,r5,(PPC_FEATURE_HAS_ALTIVEC >> 16) |
273 | |
274 | clrrdi r10,r10,4 |
275 | beq L(has_no_vec) |
276 | clrrdi r9,r9,4 |
277 | mr r5,r10 /* Capture *v_regs value in r5. */ |
278 | |
279 | stvx v0,0,r10 |
280 | stvx v1,0,r9 |
281 | addi r10,r10,32 |
282 | addi r9,r9,32 |
283 | |
284 | stvx v2,0,r10 |
285 | stvx v3,0,r9 |
286 | addi r10,r10,32 |
287 | addi r9,r9,32 |
288 | |
289 | stvx v4,0,r10 |
290 | stvx v5,0,r9 |
291 | addi r10,r10,32 |
292 | addi r9,r9,32 |
293 | |
294 | stvx v6,0,r10 |
295 | stvx v7,0,r9 |
296 | addi r10,r10,32 |
297 | addi r9,r9,32 |
298 | |
299 | stvx v8,0,r10 |
300 | stvx v9,0,r9 |
301 | addi r10,r10,32 |
302 | addi r9,r9,32 |
303 | |
304 | stvx v10,0,r10 |
305 | stvx v11,0,r9 |
306 | addi r10,r10,32 |
307 | addi r9,r9,32 |
308 | |
309 | stvx v12,0,r10 |
310 | stvx v13,0,r9 |
311 | addi r10,r10,32 |
312 | addi r9,r9,32 |
313 | |
314 | stvx v14,0,r10 |
315 | stvx v15,0,r9 |
316 | addi r10,r10,32 |
317 | addi r9,r9,32 |
318 | |
319 | stvx v16,0,r10 |
320 | stvx v17,0,r9 |
321 | addi r10,r10,32 |
322 | addi r9,r9,32 |
323 | |
324 | stvx v18,0,r10 |
325 | stvx v19,0,r9 |
326 | addi r10,r10,32 |
327 | addi r9,r9,32 |
328 | |
329 | stvx v20,0,r10 |
330 | stvx v21,0,r9 |
331 | addi r10,r10,32 |
332 | addi r9,r9,32 |
333 | |
334 | stvx v22,0,r10 |
335 | stvx v23,0,r9 |
336 | addi r10,r10,32 |
337 | addi r9,r9,32 |
338 | |
339 | stvx v24,0,r10 |
340 | stvx v25,0,r9 |
341 | addi r10,r10,32 |
342 | addi r9,r9,32 |
343 | |
344 | stvx v26,0,r10 |
345 | stvx v27,0,r9 |
346 | addi r10,r10,32 |
347 | addi r9,r9,32 |
348 | |
349 | stvx v28,0,r10 |
350 | stvx v29,0,r9 |
351 | addi r10,r10,32 |
352 | addi r9,r9,32 |
353 | |
354 | stvx v30,0,r10 |
355 | stvx v31,0,r9 |
356 | addi r10,r10,32 |
357 | addi r9,r9,32 |
358 | |
359 | mfvscr v0 |
360 | mfspr r0,VRSAVE |
361 | stvx v0,0,r10 |
362 | stw r0,0(9) |
363 | |
364 | L(has_no_vec): |
365 | /* |
366 | Store either a NULL or a quadword aligned pointer to the Vector register |
367 | array into *v_regs. |
368 | */ |
369 | std r5,(SIGCONTEXT_V_REGS_PTR)(r3) |
370 | |
371 | addi r5,r3,UCONTEXT_SIGMASK |
372 | li r4,0 |
373 | li r3,SIG_BLOCK |
374 | bl JUMPTARGET(__sigprocmask) |
375 | nop |
376 | |
377 | ld r0,128+FRAME_LR_SAVE(r1) |
378 | addi r1,r1,128 |
379 | mtlr r0 |
380 | blr |
381 | PSEUDO_END(__getcontext) |
382 | |
383 | versioned_symbol (libc, __getcontext, getcontext, GLIBC_2_3_4) |
384 | |