]>
Commit | Line | Data |
---|---|---|
befb7447 LV |
1 | /* |
2 | * Emulation of Linux signals | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
5f764597 LV |
19 | #include "qemu/osdep.h" |
20 | #include "qemu.h" | |
3b249d26 | 21 | #include "user-internals.h" |
5f764597 LV |
22 | #include "signal-common.h" |
23 | #include "linux-user/trace.h" | |
24 | ||
25 | struct target_sigcontext { | |
26 | abi_ulong trap_no; | |
27 | abi_ulong error_code; | |
28 | abi_ulong oldmask; | |
29 | abi_ulong arm_r0; | |
30 | abi_ulong arm_r1; | |
31 | abi_ulong arm_r2; | |
32 | abi_ulong arm_r3; | |
33 | abi_ulong arm_r4; | |
34 | abi_ulong arm_r5; | |
35 | abi_ulong arm_r6; | |
36 | abi_ulong arm_r7; | |
37 | abi_ulong arm_r8; | |
38 | abi_ulong arm_r9; | |
39 | abi_ulong arm_r10; | |
40 | abi_ulong arm_fp; | |
41 | abi_ulong arm_ip; | |
42 | abi_ulong arm_sp; | |
43 | abi_ulong arm_lr; | |
44 | abi_ulong arm_pc; | |
45 | abi_ulong arm_cpsr; | |
46 | abi_ulong fault_address; | |
47 | }; | |
48 | ||
b807a108 | 49 | struct target_ucontext { |
5f764597 LV |
50 | abi_ulong tuc_flags; |
51 | abi_ulong tuc_link; | |
52 | target_stack_t tuc_stack; | |
53 | struct target_sigcontext tuc_mcontext; | |
54 | target_sigset_t tuc_sigmask; /* mask last for extensibility */ | |
55 | char __unused[128 - sizeof(target_sigset_t)]; | |
56 | abi_ulong tuc_regspace[128] __attribute__((__aligned__(8))); | |
57 | }; | |
58 | ||
59 | struct target_user_vfp { | |
60 | uint64_t fpregs[32]; | |
61 | abi_ulong fpscr; | |
62 | }; | |
63 | ||
64 | struct target_user_vfp_exc { | |
65 | abi_ulong fpexc; | |
66 | abi_ulong fpinst; | |
67 | abi_ulong fpinst2; | |
68 | }; | |
69 | ||
70 | struct target_vfp_sigframe { | |
71 | abi_ulong magic; | |
72 | abi_ulong size; | |
73 | struct target_user_vfp ufp; | |
74 | struct target_user_vfp_exc ufp_exc; | |
75 | } __attribute__((__aligned__(8))); | |
76 | ||
77 | struct target_iwmmxt_sigframe { | |
78 | abi_ulong magic; | |
79 | abi_ulong size; | |
80 | uint64_t regs[16]; | |
81 | /* Note that not all the coprocessor control registers are stored here */ | |
82 | uint32_t wcssf; | |
83 | uint32_t wcasf; | |
84 | uint32_t wcgr0; | |
85 | uint32_t wcgr1; | |
86 | uint32_t wcgr2; | |
87 | uint32_t wcgr3; | |
88 | } __attribute__((__aligned__(8))); | |
89 | ||
90 | #define TARGET_VFP_MAGIC 0x56465001 | |
91 | #define TARGET_IWMMXT_MAGIC 0x12ef842a | |
92 | ||
b807a108 | 93 | struct sigframe |
5f764597 | 94 | { |
b807a108 | 95 | struct target_ucontext uc; |
e8fa7295 | 96 | abi_ulong retcode[4]; |
5f764597 LV |
97 | }; |
98 | ||
b807a108 | 99 | struct rt_sigframe |
5f764597 LV |
100 | { |
101 | struct target_siginfo info; | |
b5d66e0d | 102 | struct sigframe sig; |
5f764597 LV |
103 | }; |
104 | ||
b5d66e0d | 105 | static abi_ptr sigreturn_fdpic_tramp; |
5f764597 | 106 | |
e8fa7295 | 107 | /* |
b5d66e0d RH |
108 | * Up to 3 words of 'retcode' in the sigframe are code, |
109 | * with retcode[3] being used by fdpic for the function descriptor. | |
110 | * This code is not actually executed, but is retained for ABI compat. | |
111 | * | |
112 | * We will create a table of 8 retcode variants in the sigtramp page. | |
113 | * Let each table entry use 3 words. | |
e8fa7295 | 114 | */ |
b5d66e0d RH |
115 | #define RETCODE_WORDS 3 |
116 | #define RETCODE_BYTES (RETCODE_WORDS * 4) | |
5f764597 LV |
117 | |
118 | static inline int valid_user_regs(CPUARMState *regs) | |
119 | { | |
120 | return 1; | |
121 | } | |
122 | ||
123 | static void | |
124 | setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ | |
125 | CPUARMState *env, abi_ulong mask) | |
126 | { | |
127 | __put_user(env->regs[0], &sc->arm_r0); | |
128 | __put_user(env->regs[1], &sc->arm_r1); | |
129 | __put_user(env->regs[2], &sc->arm_r2); | |
130 | __put_user(env->regs[3], &sc->arm_r3); | |
131 | __put_user(env->regs[4], &sc->arm_r4); | |
132 | __put_user(env->regs[5], &sc->arm_r5); | |
133 | __put_user(env->regs[6], &sc->arm_r6); | |
134 | __put_user(env->regs[7], &sc->arm_r7); | |
135 | __put_user(env->regs[8], &sc->arm_r8); | |
136 | __put_user(env->regs[9], &sc->arm_r9); | |
137 | __put_user(env->regs[10], &sc->arm_r10); | |
138 | __put_user(env->regs[11], &sc->arm_fp); | |
139 | __put_user(env->regs[12], &sc->arm_ip); | |
140 | __put_user(env->regs[13], &sc->arm_sp); | |
141 | __put_user(env->regs[14], &sc->arm_lr); | |
142 | __put_user(env->regs[15], &sc->arm_pc); | |
5f764597 | 143 | __put_user(cpsr_read(env), &sc->arm_cpsr); |
5f764597 LV |
144 | |
145 | __put_user(/* current->thread.trap_no */ 0, &sc->trap_no); | |
146 | __put_user(/* current->thread.error_code */ 0, &sc->error_code); | |
147 | __put_user(/* current->thread.address */ 0, &sc->fault_address); | |
148 | __put_user(mask, &sc->oldmask); | |
149 | } | |
150 | ||
151 | static inline abi_ulong | |
152 | get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize) | |
153 | { | |
465e237b | 154 | unsigned long sp; |
5f764597 | 155 | |
465e237b | 156 | sp = target_sigsp(get_sp_from_cpustate(regs), ka); |
5f764597 LV |
157 | /* |
158 | * ATPCS B01 mandates 8-byte alignment | |
159 | */ | |
160 | return (sp - framesize) & ~7; | |
161 | } | |
162 | ||
e8fa7295 | 163 | static int |
b5d66e0d RH |
164 | setup_return(CPUARMState *env, struct target_sigaction *ka, int usig, |
165 | struct sigframe *frame, abi_ulong sp_addr) | |
5f764597 | 166 | { |
e8fa7295 CL |
167 | abi_ulong handler = 0; |
168 | abi_ulong handler_fdpic_GOT = 0; | |
5f764597 | 169 | abi_ulong retcode; |
b5d66e0d | 170 | int thumb, retcode_idx; |
e8fa7295 | 171 | int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info); |
b5d66e0d | 172 | bool copy_retcode; |
e8fa7295 CL |
173 | |
174 | if (is_fdpic) { | |
175 | /* In FDPIC mode, ka->_sa_handler points to a function | |
176 | * descriptor (FD). The first word contains the address of the | |
177 | * handler. The second word contains the value of the PIC | |
178 | * register (r9). */ | |
179 | abi_ulong funcdesc_ptr = ka->_sa_handler; | |
180 | if (get_user_ual(handler, funcdesc_ptr) | |
181 | || get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) { | |
182 | return 1; | |
183 | } | |
184 | } else { | |
185 | handler = ka->_sa_handler; | |
186 | } | |
187 | ||
188 | thumb = handler & 1; | |
b5d66e0d | 189 | retcode_idx = thumb + (ka->sa_flags & TARGET_SA_SIGINFO ? 2 : 0); |
e8fa7295 | 190 | |
5f764597 LV |
191 | uint32_t cpsr = cpsr_read(env); |
192 | ||
193 | cpsr &= ~CPSR_IT; | |
194 | if (thumb) { | |
195 | cpsr |= CPSR_T; | |
196 | } else { | |
197 | cpsr &= ~CPSR_T; | |
198 | } | |
45e28139 AA |
199 | if (env->cp15.sctlr_el[1] & SCTLR_E0E) { |
200 | cpsr |= CPSR_E; | |
201 | } else { | |
202 | cpsr &= ~CPSR_E; | |
203 | } | |
5f764597 LV |
204 | |
205 | if (ka->sa_flags & TARGET_SA_RESTORER) { | |
e8fa7295 | 206 | if (is_fdpic) { |
b5d66e0d RH |
207 | __put_user((abi_ulong)ka->sa_restorer, &frame->retcode[3]); |
208 | retcode = (sigreturn_fdpic_tramp + | |
209 | retcode_idx * RETCODE_BYTES + thumb); | |
210 | copy_retcode = true; | |
e8fa7295 CL |
211 | } else { |
212 | retcode = ka->sa_restorer; | |
b5d66e0d | 213 | copy_retcode = false; |
e8fa7295 | 214 | } |
5f764597 | 215 | } else { |
b5d66e0d RH |
216 | retcode = default_sigreturn + retcode_idx * RETCODE_BYTES + thumb; |
217 | copy_retcode = true; | |
218 | } | |
5f764597 | 219 | |
b5d66e0d RH |
220 | /* Copy the code to the stack slot for ABI compatibility. */ |
221 | if (copy_retcode) { | |
222 | memcpy(frame->retcode, g2h_untagged(retcode & ~1), RETCODE_BYTES); | |
5f764597 LV |
223 | } |
224 | ||
225 | env->regs[0] = usig; | |
e8fa7295 CL |
226 | if (is_fdpic) { |
227 | env->regs[9] = handler_fdpic_GOT; | |
228 | } | |
b5d66e0d | 229 | env->regs[13] = sp_addr; |
5f764597 LV |
230 | env->regs[14] = retcode; |
231 | env->regs[15] = handler & (thumb ? ~1 : ~3); | |
45e28139 | 232 | cpsr_write(env, cpsr, CPSR_IT | CPSR_T | CPSR_E, CPSRWriteByInstr); |
e8fa7295 CL |
233 | |
234 | return 0; | |
5f764597 LV |
235 | } |
236 | ||
b807a108 | 237 | static abi_ulong *setup_sigframe_vfp(abi_ulong *regspace, CPUARMState *env) |
5f764597 LV |
238 | { |
239 | int i; | |
240 | struct target_vfp_sigframe *vfpframe; | |
241 | vfpframe = (struct target_vfp_sigframe *)regspace; | |
242 | __put_user(TARGET_VFP_MAGIC, &vfpframe->magic); | |
243 | __put_user(sizeof(*vfpframe), &vfpframe->size); | |
244 | for (i = 0; i < 32; i++) { | |
245 | __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]); | |
246 | } | |
247 | __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr); | |
248 | __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc); | |
249 | __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst); | |
250 | __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2); | |
251 | return (abi_ulong*)(vfpframe+1); | |
252 | } | |
253 | ||
b807a108 | 254 | static abi_ulong *setup_sigframe_iwmmxt(abi_ulong *regspace, CPUARMState *env) |
5f764597 LV |
255 | { |
256 | int i; | |
257 | struct target_iwmmxt_sigframe *iwmmxtframe; | |
258 | iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace; | |
259 | __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic); | |
260 | __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size); | |
261 | for (i = 0; i < 16; i++) { | |
262 | __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]); | |
263 | } | |
264 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf); | |
265 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf); | |
266 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0); | |
267 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1); | |
268 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2); | |
269 | __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3); | |
270 | return (abi_ulong*)(iwmmxtframe+1); | |
271 | } | |
272 | ||
b807a108 RH |
273 | static void setup_sigframe(struct target_ucontext *uc, |
274 | target_sigset_t *set, CPUARMState *env) | |
5f764597 LV |
275 | { |
276 | struct target_sigaltstack stack; | |
277 | int i; | |
278 | abi_ulong *regspace; | |
279 | ||
280 | /* Clear all the bits of the ucontext we don't use. */ | |
b807a108 | 281 | memset(uc, 0, offsetof(struct target_ucontext, tuc_mcontext)); |
5f764597 LV |
282 | |
283 | memset(&stack, 0, sizeof(stack)); | |
465e237b | 284 | target_save_altstack(&stack, env); |
5f764597 LV |
285 | memcpy(&uc->tuc_stack, &stack, sizeof(stack)); |
286 | ||
287 | setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]); | |
288 | /* Save coprocessor signal frame. */ | |
289 | regspace = uc->tuc_regspace; | |
7fbc6a40 | 290 | if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) { |
b807a108 | 291 | regspace = setup_sigframe_vfp(regspace, env); |
5f764597 LV |
292 | } |
293 | if (arm_feature(env, ARM_FEATURE_IWMMXT)) { | |
b807a108 | 294 | regspace = setup_sigframe_iwmmxt(regspace, env); |
5f764597 LV |
295 | } |
296 | ||
297 | /* Write terminating magic word */ | |
298 | __put_user(0, regspace); | |
299 | ||
300 | for(i = 0; i < TARGET_NSIG_WORDS; i++) { | |
301 | __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]); | |
302 | } | |
303 | } | |
304 | ||
b807a108 RH |
305 | void setup_frame(int usig, struct target_sigaction *ka, |
306 | target_sigset_t *set, CPUARMState *regs) | |
5f764597 | 307 | { |
b807a108 | 308 | struct sigframe *frame; |
5f764597 LV |
309 | abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame)); |
310 | ||
311 | trace_user_setup_frame(regs, frame_addr); | |
312 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
313 | goto sigsegv; | |
314 | } | |
315 | ||
b807a108 | 316 | setup_sigframe(&frame->uc, set, regs); |
5f764597 | 317 | |
b5d66e0d | 318 | if (setup_return(regs, ka, usig, frame, frame_addr)) { |
e8fa7295 CL |
319 | goto sigsegv; |
320 | } | |
5f764597 LV |
321 | |
322 | unlock_user_struct(frame, frame_addr, 1); | |
323 | return; | |
324 | sigsegv: | |
e8fa7295 | 325 | unlock_user_struct(frame, frame_addr, 1); |
5f764597 LV |
326 | force_sigsegv(usig); |
327 | } | |
328 | ||
b807a108 RH |
329 | void setup_rt_frame(int usig, struct target_sigaction *ka, |
330 | target_siginfo_t *info, | |
331 | target_sigset_t *set, CPUARMState *env) | |
5f764597 | 332 | { |
b807a108 | 333 | struct rt_sigframe *frame; |
5f764597 LV |
334 | abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame)); |
335 | abi_ulong info_addr, uc_addr; | |
336 | ||
337 | trace_user_setup_rt_frame(env, frame_addr); | |
338 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
339 | goto sigsegv; | |
340 | } | |
341 | ||
b807a108 | 342 | info_addr = frame_addr + offsetof(struct rt_sigframe, info); |
b5d66e0d | 343 | uc_addr = frame_addr + offsetof(struct rt_sigframe, sig.uc); |
5f764597 LV |
344 | tswap_siginfo(&frame->info, info); |
345 | ||
b5d66e0d | 346 | setup_sigframe(&frame->sig.uc, set, env); |
5f764597 | 347 | |
b5d66e0d | 348 | if (setup_return(env, ka, usig, &frame->sig, frame_addr)) { |
e8fa7295 CL |
349 | goto sigsegv; |
350 | } | |
5f764597 LV |
351 | |
352 | env->regs[1] = info_addr; | |
353 | env->regs[2] = uc_addr; | |
354 | ||
355 | unlock_user_struct(frame, frame_addr, 1); | |
356 | return; | |
357 | sigsegv: | |
e8fa7295 | 358 | unlock_user_struct(frame, frame_addr, 1); |
5f764597 LV |
359 | force_sigsegv(usig); |
360 | } | |
361 | ||
5f764597 LV |
362 | static int |
363 | restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc) | |
364 | { | |
365 | int err = 0; | |
366 | uint32_t cpsr; | |
367 | ||
368 | __get_user(env->regs[0], &sc->arm_r0); | |
369 | __get_user(env->regs[1], &sc->arm_r1); | |
370 | __get_user(env->regs[2], &sc->arm_r2); | |
371 | __get_user(env->regs[3], &sc->arm_r3); | |
372 | __get_user(env->regs[4], &sc->arm_r4); | |
373 | __get_user(env->regs[5], &sc->arm_r5); | |
374 | __get_user(env->regs[6], &sc->arm_r6); | |
375 | __get_user(env->regs[7], &sc->arm_r7); | |
376 | __get_user(env->regs[8], &sc->arm_r8); | |
377 | __get_user(env->regs[9], &sc->arm_r9); | |
378 | __get_user(env->regs[10], &sc->arm_r10); | |
379 | __get_user(env->regs[11], &sc->arm_fp); | |
380 | __get_user(env->regs[12], &sc->arm_ip); | |
381 | __get_user(env->regs[13], &sc->arm_sp); | |
382 | __get_user(env->regs[14], &sc->arm_lr); | |
383 | __get_user(env->regs[15], &sc->arm_pc); | |
5f764597 LV |
384 | __get_user(cpsr, &sc->arm_cpsr); |
385 | cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr); | |
5f764597 LV |
386 | |
387 | err |= !valid_user_regs(env); | |
388 | ||
389 | return err; | |
390 | } | |
391 | ||
b807a108 | 392 | static abi_ulong *restore_sigframe_vfp(CPUARMState *env, abi_ulong *regspace) |
5f764597 LV |
393 | { |
394 | int i; | |
395 | abi_ulong magic, sz; | |
396 | uint32_t fpscr, fpexc; | |
397 | struct target_vfp_sigframe *vfpframe; | |
398 | vfpframe = (struct target_vfp_sigframe *)regspace; | |
399 | ||
400 | __get_user(magic, &vfpframe->magic); | |
401 | __get_user(sz, &vfpframe->size); | |
402 | if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) { | |
403 | return 0; | |
404 | } | |
405 | for (i = 0; i < 32; i++) { | |
406 | __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]); | |
407 | } | |
408 | __get_user(fpscr, &vfpframe->ufp.fpscr); | |
409 | vfp_set_fpscr(env, fpscr); | |
410 | __get_user(fpexc, &vfpframe->ufp_exc.fpexc); | |
411 | /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid | |
412 | * and the exception flag is cleared | |
413 | */ | |
414 | fpexc |= (1 << 30); | |
415 | fpexc &= ~((1 << 31) | (1 << 28)); | |
416 | env->vfp.xregs[ARM_VFP_FPEXC] = fpexc; | |
417 | __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst); | |
418 | __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2); | |
419 | return (abi_ulong*)(vfpframe + 1); | |
420 | } | |
421 | ||
b807a108 RH |
422 | static abi_ulong *restore_sigframe_iwmmxt(CPUARMState *env, |
423 | abi_ulong *regspace) | |
5f764597 LV |
424 | { |
425 | int i; | |
426 | abi_ulong magic, sz; | |
427 | struct target_iwmmxt_sigframe *iwmmxtframe; | |
428 | iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace; | |
429 | ||
430 | __get_user(magic, &iwmmxtframe->magic); | |
431 | __get_user(sz, &iwmmxtframe->size); | |
432 | if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) { | |
433 | return 0; | |
434 | } | |
435 | for (i = 0; i < 16; i++) { | |
436 | __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]); | |
437 | } | |
438 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf); | |
439 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf); | |
440 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0); | |
441 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1); | |
442 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2); | |
443 | __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3); | |
444 | return (abi_ulong*)(iwmmxtframe + 1); | |
445 | } | |
446 | ||
b807a108 RH |
447 | static int do_sigframe_return(CPUARMState *env, |
448 | target_ulong context_addr, | |
449 | struct target_ucontext *uc) | |
5f764597 LV |
450 | { |
451 | sigset_t host_set; | |
452 | abi_ulong *regspace; | |
453 | ||
454 | target_to_host_sigset(&host_set, &uc->tuc_sigmask); | |
455 | set_sigmask(&host_set); | |
456 | ||
b807a108 | 457 | if (restore_sigcontext(env, &uc->tuc_mcontext)) { |
5f764597 | 458 | return 1; |
b807a108 | 459 | } |
5f764597 LV |
460 | |
461 | /* Restore coprocessor signal frame */ | |
462 | regspace = uc->tuc_regspace; | |
7fbc6a40 | 463 | if (cpu_isar_feature(aa32_vfp_simd, env_archcpu(env))) { |
b807a108 | 464 | regspace = restore_sigframe_vfp(env, regspace); |
5f764597 LV |
465 | if (!regspace) { |
466 | return 1; | |
467 | } | |
468 | } | |
469 | if (arm_feature(env, ARM_FEATURE_IWMMXT)) { | |
b807a108 | 470 | regspace = restore_sigframe_iwmmxt(env, regspace); |
5f764597 LV |
471 | if (!regspace) { |
472 | return 1; | |
473 | } | |
474 | } | |
475 | ||
ddc3e74d | 476 | target_restore_altstack(&uc->tuc_stack, env); |
5f764597 LV |
477 | |
478 | #if 0 | |
479 | /* Send SIGTRAP if we're single-stepping */ | |
480 | if (ptrace_cancel_bpt(current)) | |
481 | send_sig(SIGTRAP, current, 1); | |
482 | #endif | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
b807a108 | 487 | long do_sigreturn(CPUARMState *env) |
5f764597 LV |
488 | { |
489 | abi_ulong frame_addr; | |
b807a108 | 490 | struct sigframe *frame = NULL; |
5f764597 LV |
491 | |
492 | /* | |
493 | * Since we stacked the signal on a 64-bit boundary, | |
494 | * then 'sp' should be word aligned here. If it's | |
495 | * not, then the user is trying to mess with us. | |
496 | */ | |
497 | frame_addr = env->regs[13]; | |
498 | trace_user_do_sigreturn(env, frame_addr); | |
499 | if (frame_addr & 7) { | |
500 | goto badframe; | |
501 | } | |
502 | ||
503 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { | |
504 | goto badframe; | |
505 | } | |
506 | ||
b807a108 RH |
507 | if (do_sigframe_return(env, |
508 | frame_addr + offsetof(struct sigframe, uc), | |
509 | &frame->uc)) { | |
5f764597 LV |
510 | goto badframe; |
511 | } | |
512 | ||
513 | unlock_user_struct(frame, frame_addr, 0); | |
57a0c938 | 514 | return -QEMU_ESIGRETURN; |
5f764597 LV |
515 | |
516 | badframe: | |
517 | unlock_user_struct(frame, frame_addr, 0); | |
518 | force_sig(TARGET_SIGSEGV); | |
57a0c938 | 519 | return -QEMU_ESIGRETURN; |
5f764597 LV |
520 | } |
521 | ||
b807a108 | 522 | long do_rt_sigreturn(CPUARMState *env) |
5f764597 LV |
523 | { |
524 | abi_ulong frame_addr; | |
b807a108 | 525 | struct rt_sigframe *frame = NULL; |
5f764597 LV |
526 | |
527 | /* | |
528 | * Since we stacked the signal on a 64-bit boundary, | |
529 | * then 'sp' should be word aligned here. If it's | |
530 | * not, then the user is trying to mess with us. | |
531 | */ | |
532 | frame_addr = env->regs[13]; | |
533 | trace_user_do_rt_sigreturn(env, frame_addr); | |
534 | if (frame_addr & 7) { | |
535 | goto badframe; | |
536 | } | |
537 | ||
538 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { | |
539 | goto badframe; | |
540 | } | |
541 | ||
b807a108 | 542 | if (do_sigframe_return(env, |
b5d66e0d RH |
543 | frame_addr + offsetof(struct rt_sigframe, sig.uc), |
544 | &frame->sig.uc)) { | |
5f764597 LV |
545 | goto badframe; |
546 | } | |
547 | ||
548 | unlock_user_struct(frame, frame_addr, 0); | |
57a0c938 | 549 | return -QEMU_ESIGRETURN; |
5f764597 LV |
550 | |
551 | badframe: | |
552 | unlock_user_struct(frame, frame_addr, 0); | |
553 | force_sig(TARGET_SIGSEGV); | |
57a0c938 | 554 | return -QEMU_ESIGRETURN; |
5f764597 | 555 | } |
b5d66e0d RH |
556 | |
557 | /* | |
558 | * EABI syscalls pass the number via r7. | |
559 | * Note that the kernel still adds the OABI syscall number to the trap, | |
560 | * presumably for backward ABI compatibility with unwinders. | |
561 | */ | |
562 | #define ARM_MOV_R7_IMM(X) (0xe3a07000 | (X)) | |
563 | #define ARM_SWI_SYS(X) (0xef000000 | (X) | ARM_SYSCALL_BASE) | |
564 | ||
565 | #define THUMB_MOVS_R7_IMM(X) (0x2700 | (X)) | |
566 | #define THUMB_SWI_SYS 0xdf00 | |
567 | ||
568 | static void write_arm_sigreturn(uint32_t *rc, int syscall) | |
569 | { | |
570 | __put_user(ARM_MOV_R7_IMM(syscall), rc); | |
571 | __put_user(ARM_SWI_SYS(syscall), rc + 1); | |
572 | /* Wrote 8 of 12 bytes */ | |
573 | } | |
574 | ||
575 | static void write_thm_sigreturn(uint32_t *rc, int syscall) | |
576 | { | |
577 | __put_user(THUMB_SWI_SYS << 16 | THUMB_MOVS_R7_IMM(syscall), rc); | |
578 | /* Wrote 4 of 12 bytes */ | |
579 | } | |
580 | ||
581 | /* | |
582 | * Stub needed to make sure the FD register (r9) contains the right value. | |
583 | * Use the same instruction sequence as the kernel. | |
584 | */ | |
585 | static void write_arm_fdpic_sigreturn(uint32_t *rc, int ofs) | |
586 | { | |
587 | assert(ofs <= 0xfff); | |
588 | __put_user(0xe59d3000 | ofs, rc + 0); /* ldr r3, [sp, #ofs] */ | |
589 | __put_user(0xe8930908, rc + 1); /* ldm r3, { r3, r9 } */ | |
590 | __put_user(0xe12fff13, rc + 2); /* bx r3 */ | |
591 | /* Wrote 12 of 12 bytes */ | |
592 | } | |
593 | ||
594 | static void write_thm_fdpic_sigreturn(void *vrc, int ofs) | |
595 | { | |
596 | uint16_t *rc = vrc; | |
597 | ||
598 | assert((ofs & ~0x3fc) == 0); | |
599 | __put_user(0x9b00 | (ofs >> 2), rc + 0); /* ldr r3, [sp, #ofs] */ | |
600 | __put_user(0xcb0c, rc + 1); /* ldm r3, { r2, r3 } */ | |
601 | __put_user(0x4699, rc + 2); /* mov r9, r3 */ | |
602 | __put_user(0x4710, rc + 3); /* bx r2 */ | |
603 | /* Wrote 8 of 12 bytes */ | |
604 | } | |
605 | ||
606 | void setup_sigtramp(abi_ulong sigtramp_page) | |
607 | { | |
608 | uint32_t total_size = 8 * RETCODE_BYTES; | |
609 | uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, total_size, 0); | |
610 | ||
611 | assert(tramp != NULL); | |
612 | ||
613 | default_sigreturn = sigtramp_page; | |
614 | write_arm_sigreturn(&tramp[0 * RETCODE_WORDS], TARGET_NR_sigreturn); | |
615 | write_thm_sigreturn(&tramp[1 * RETCODE_WORDS], TARGET_NR_sigreturn); | |
616 | write_arm_sigreturn(&tramp[2 * RETCODE_WORDS], TARGET_NR_rt_sigreturn); | |
617 | write_thm_sigreturn(&tramp[3 * RETCODE_WORDS], TARGET_NR_rt_sigreturn); | |
618 | ||
619 | sigreturn_fdpic_tramp = sigtramp_page + 4 * RETCODE_BYTES; | |
620 | write_arm_fdpic_sigreturn(tramp + 4 * RETCODE_WORDS, | |
621 | offsetof(struct sigframe, retcode[3])); | |
622 | write_thm_fdpic_sigreturn(tramp + 5 * RETCODE_WORDS, | |
623 | offsetof(struct sigframe, retcode[3])); | |
624 | write_arm_fdpic_sigreturn(tramp + 6 * RETCODE_WORDS, | |
625 | offsetof(struct rt_sigframe, sig.retcode[3])); | |
626 | write_thm_fdpic_sigreturn(tramp + 7 * RETCODE_WORDS, | |
627 | offsetof(struct rt_sigframe, sig.retcode[3])); | |
628 | ||
629 | unlock_user(tramp, sigtramp_page, total_size); | |
630 | } |