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d2a56bd2 TS |
1 | /* |
2 | * Emulation of Linux signals | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program 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 | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | #include "qemu/osdep.h" | |
21 | #include "qemu.h" | |
22 | #include "signal-common.h" | |
23 | #include "linux-user/trace.h" | |
24 | ||
25 | struct target_sigcontext { | |
26 | target_ulong r0, r1, r2, r3; | |
27 | target_ulong r4, r5, r6, r7; | |
28 | target_ulong r8, r9, r10, r11; | |
29 | target_ulong r12, r13, r14, r15; | |
30 | target_ulong r16, r17, r18, r19; | |
31 | target_ulong r20, r21, r22, r23; | |
32 | target_ulong r24, r25, r26, r27; | |
33 | target_ulong r28, r29, r30, r31; | |
34 | target_ulong sa0; | |
35 | target_ulong lc0; | |
36 | target_ulong sa1; | |
37 | target_ulong lc1; | |
38 | target_ulong m0; | |
39 | target_ulong m1; | |
40 | target_ulong usr; | |
41 | target_ulong p3_0; | |
42 | target_ulong gp; | |
43 | target_ulong ugp; | |
44 | target_ulong pc; | |
45 | target_ulong cause; | |
46 | target_ulong badva; | |
47 | target_ulong pad1; | |
48 | target_ulong pad2; | |
49 | target_ulong pad3; | |
50 | }; | |
51 | ||
52 | struct target_ucontext { | |
53 | unsigned long uc_flags; | |
54 | target_ulong uc_link; /* target pointer */ | |
55 | target_stack_t uc_stack; | |
56 | struct target_sigcontext uc_mcontext; | |
57 | target_sigset_t uc_sigmask; | |
58 | }; | |
59 | ||
60 | struct target_rt_sigframe { | |
61 | uint32_t tramp[2]; | |
62 | struct target_siginfo info; | |
63 | struct target_ucontext uc; | |
64 | }; | |
65 | ||
66 | static abi_ulong get_sigframe(struct target_sigaction *ka, | |
67 | CPUHexagonState *regs, size_t framesize) | |
68 | { | |
69 | abi_ulong sp = get_sp_from_cpustate(regs); | |
70 | ||
71 | /* This is the X/Open sanctioned signal stack switching. */ | |
72 | sp = target_sigsp(sp, ka) - framesize; | |
73 | ||
74 | sp = QEMU_ALIGN_DOWN(sp, 8); | |
75 | ||
76 | return sp; | |
77 | } | |
78 | ||
79 | static void setup_sigcontext(struct target_sigcontext *sc, CPUHexagonState *env) | |
80 | { | |
81 | __put_user(env->gpr[HEX_REG_R00], &sc->r0); | |
82 | __put_user(env->gpr[HEX_REG_R01], &sc->r1); | |
83 | __put_user(env->gpr[HEX_REG_R02], &sc->r2); | |
84 | __put_user(env->gpr[HEX_REG_R03], &sc->r3); | |
85 | __put_user(env->gpr[HEX_REG_R04], &sc->r4); | |
86 | __put_user(env->gpr[HEX_REG_R05], &sc->r5); | |
87 | __put_user(env->gpr[HEX_REG_R06], &sc->r6); | |
88 | __put_user(env->gpr[HEX_REG_R07], &sc->r7); | |
89 | __put_user(env->gpr[HEX_REG_R08], &sc->r8); | |
90 | __put_user(env->gpr[HEX_REG_R09], &sc->r9); | |
91 | __put_user(env->gpr[HEX_REG_R10], &sc->r10); | |
92 | __put_user(env->gpr[HEX_REG_R11], &sc->r11); | |
93 | __put_user(env->gpr[HEX_REG_R12], &sc->r12); | |
94 | __put_user(env->gpr[HEX_REG_R13], &sc->r13); | |
95 | __put_user(env->gpr[HEX_REG_R14], &sc->r14); | |
96 | __put_user(env->gpr[HEX_REG_R15], &sc->r15); | |
97 | __put_user(env->gpr[HEX_REG_R16], &sc->r16); | |
98 | __put_user(env->gpr[HEX_REG_R17], &sc->r17); | |
99 | __put_user(env->gpr[HEX_REG_R18], &sc->r18); | |
100 | __put_user(env->gpr[HEX_REG_R19], &sc->r19); | |
101 | __put_user(env->gpr[HEX_REG_R20], &sc->r20); | |
102 | __put_user(env->gpr[HEX_REG_R21], &sc->r21); | |
103 | __put_user(env->gpr[HEX_REG_R22], &sc->r22); | |
104 | __put_user(env->gpr[HEX_REG_R23], &sc->r23); | |
105 | __put_user(env->gpr[HEX_REG_R24], &sc->r24); | |
106 | __put_user(env->gpr[HEX_REG_R25], &sc->r25); | |
107 | __put_user(env->gpr[HEX_REG_R26], &sc->r26); | |
108 | __put_user(env->gpr[HEX_REG_R27], &sc->r27); | |
109 | __put_user(env->gpr[HEX_REG_R28], &sc->r28); | |
110 | __put_user(env->gpr[HEX_REG_R29], &sc->r29); | |
111 | __put_user(env->gpr[HEX_REG_R30], &sc->r30); | |
112 | __put_user(env->gpr[HEX_REG_R31], &sc->r31); | |
113 | __put_user(env->gpr[HEX_REG_SA0], &sc->sa0); | |
114 | __put_user(env->gpr[HEX_REG_LC0], &sc->lc0); | |
115 | __put_user(env->gpr[HEX_REG_SA1], &sc->sa1); | |
116 | __put_user(env->gpr[HEX_REG_LC1], &sc->lc1); | |
117 | __put_user(env->gpr[HEX_REG_M0], &sc->m0); | |
118 | __put_user(env->gpr[HEX_REG_M1], &sc->m1); | |
119 | __put_user(env->gpr[HEX_REG_USR], &sc->usr); | |
120 | __put_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); | |
121 | __put_user(env->gpr[HEX_REG_GP], &sc->gp); | |
122 | __put_user(env->gpr[HEX_REG_UGP], &sc->ugp); | |
123 | __put_user(env->gpr[HEX_REG_PC], &sc->pc); | |
124 | } | |
125 | ||
126 | static void setup_ucontext(struct target_ucontext *uc, | |
127 | CPUHexagonState *env, target_sigset_t *set) | |
128 | { | |
129 | __put_user(0, &(uc->uc_flags)); | |
130 | __put_user(0, &(uc->uc_link)); | |
131 | ||
132 | target_save_altstack(&uc->uc_stack, env); | |
133 | ||
134 | int i; | |
135 | for (i = 0; i < TARGET_NSIG_WORDS; i++) { | |
136 | __put_user(set->sig[i], &(uc->uc_sigmask.sig[i])); | |
137 | } | |
138 | ||
139 | setup_sigcontext(&uc->uc_mcontext, env); | |
140 | } | |
141 | ||
142 | static inline void install_sigtramp(uint32_t *tramp) | |
143 | { | |
144 | __put_user(0x7800d166, tramp + 0); /* { r6=#__NR_rt_sigreturn } */ | |
145 | __put_user(0x5400c004, tramp + 1); /* { trap0(#1) } */ | |
146 | } | |
147 | ||
148 | void setup_rt_frame(int sig, struct target_sigaction *ka, | |
149 | target_siginfo_t *info, | |
150 | target_sigset_t *set, CPUHexagonState *env) | |
151 | { | |
152 | abi_ulong frame_addr; | |
153 | struct target_rt_sigframe *frame; | |
154 | ||
155 | frame_addr = get_sigframe(ka, env, sizeof(*frame)); | |
156 | trace_user_setup_rt_frame(env, frame_addr); | |
157 | ||
158 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
159 | goto badframe; | |
160 | } | |
161 | ||
162 | setup_ucontext(&frame->uc, env, set); | |
163 | tswap_siginfo(&frame->info, info); | |
164 | install_sigtramp(frame->tramp); | |
165 | ||
166 | env->gpr[HEX_REG_PC] = ka->_sa_handler; | |
167 | env->gpr[HEX_REG_SP] = frame_addr; | |
168 | env->gpr[HEX_REG_R00] = sig; | |
169 | env->gpr[HEX_REG_R01] = | |
170 | frame_addr + offsetof(struct target_rt_sigframe, info); | |
171 | env->gpr[HEX_REG_R02] = | |
172 | frame_addr + offsetof(struct target_rt_sigframe, uc); | |
173 | env->gpr[HEX_REG_LR] = | |
174 | frame_addr + offsetof(struct target_rt_sigframe, tramp); | |
175 | ||
176 | return; | |
177 | ||
178 | badframe: | |
179 | unlock_user_struct(frame, frame_addr, 1); | |
180 | if (sig == TARGET_SIGSEGV) { | |
181 | ka->_sa_handler = TARGET_SIG_DFL; | |
182 | } | |
183 | force_sig(TARGET_SIGSEGV); | |
184 | } | |
185 | ||
186 | static void restore_sigcontext(CPUHexagonState *env, | |
187 | struct target_sigcontext *sc) | |
188 | { | |
189 | __get_user(env->gpr[HEX_REG_R00], &sc->r0); | |
190 | __get_user(env->gpr[HEX_REG_R01], &sc->r1); | |
191 | __get_user(env->gpr[HEX_REG_R02], &sc->r2); | |
192 | __get_user(env->gpr[HEX_REG_R03], &sc->r3); | |
193 | __get_user(env->gpr[HEX_REG_R04], &sc->r4); | |
194 | __get_user(env->gpr[HEX_REG_R05], &sc->r5); | |
195 | __get_user(env->gpr[HEX_REG_R06], &sc->r6); | |
196 | __get_user(env->gpr[HEX_REG_R07], &sc->r7); | |
197 | __get_user(env->gpr[HEX_REG_R08], &sc->r8); | |
198 | __get_user(env->gpr[HEX_REG_R09], &sc->r9); | |
199 | __get_user(env->gpr[HEX_REG_R10], &sc->r10); | |
200 | __get_user(env->gpr[HEX_REG_R11], &sc->r11); | |
201 | __get_user(env->gpr[HEX_REG_R12], &sc->r12); | |
202 | __get_user(env->gpr[HEX_REG_R13], &sc->r13); | |
203 | __get_user(env->gpr[HEX_REG_R14], &sc->r14); | |
204 | __get_user(env->gpr[HEX_REG_R15], &sc->r15); | |
205 | __get_user(env->gpr[HEX_REG_R16], &sc->r16); | |
206 | __get_user(env->gpr[HEX_REG_R17], &sc->r17); | |
207 | __get_user(env->gpr[HEX_REG_R18], &sc->r18); | |
208 | __get_user(env->gpr[HEX_REG_R19], &sc->r19); | |
209 | __get_user(env->gpr[HEX_REG_R20], &sc->r20); | |
210 | __get_user(env->gpr[HEX_REG_R21], &sc->r21); | |
211 | __get_user(env->gpr[HEX_REG_R22], &sc->r22); | |
212 | __get_user(env->gpr[HEX_REG_R23], &sc->r23); | |
213 | __get_user(env->gpr[HEX_REG_R24], &sc->r24); | |
214 | __get_user(env->gpr[HEX_REG_R25], &sc->r25); | |
215 | __get_user(env->gpr[HEX_REG_R26], &sc->r26); | |
216 | __get_user(env->gpr[HEX_REG_R27], &sc->r27); | |
217 | __get_user(env->gpr[HEX_REG_R28], &sc->r28); | |
218 | __get_user(env->gpr[HEX_REG_R29], &sc->r29); | |
219 | __get_user(env->gpr[HEX_REG_R30], &sc->r30); | |
220 | __get_user(env->gpr[HEX_REG_R31], &sc->r31); | |
221 | __get_user(env->gpr[HEX_REG_SA0], &sc->sa0); | |
222 | __get_user(env->gpr[HEX_REG_LC0], &sc->lc0); | |
223 | __get_user(env->gpr[HEX_REG_SA1], &sc->sa1); | |
224 | __get_user(env->gpr[HEX_REG_LC1], &sc->lc1); | |
225 | __get_user(env->gpr[HEX_REG_M0], &sc->m0); | |
226 | __get_user(env->gpr[HEX_REG_M1], &sc->m1); | |
227 | __get_user(env->gpr[HEX_REG_USR], &sc->usr); | |
228 | __get_user(env->gpr[HEX_REG_P3_0], &sc->p3_0); | |
229 | __get_user(env->gpr[HEX_REG_GP], &sc->gp); | |
230 | __get_user(env->gpr[HEX_REG_UGP], &sc->ugp); | |
231 | __get_user(env->gpr[HEX_REG_PC], &sc->pc); | |
232 | } | |
233 | ||
234 | static void restore_ucontext(CPUHexagonState *env, struct target_ucontext *uc) | |
235 | { | |
236 | sigset_t blocked; | |
237 | target_sigset_t target_set; | |
238 | int i; | |
239 | ||
240 | target_sigemptyset(&target_set); | |
241 | for (i = 0; i < TARGET_NSIG_WORDS; i++) { | |
242 | __get_user(target_set.sig[i], &(uc->uc_sigmask.sig[i])); | |
243 | } | |
244 | ||
245 | target_to_host_sigset_internal(&blocked, &target_set); | |
246 | set_sigmask(&blocked); | |
247 | ||
248 | restore_sigcontext(env, &uc->uc_mcontext); | |
249 | } | |
250 | ||
251 | long do_rt_sigreturn(CPUHexagonState *env) | |
252 | { | |
253 | struct target_rt_sigframe *frame; | |
254 | abi_ulong frame_addr; | |
255 | ||
256 | frame_addr = env->gpr[HEX_REG_SP]; | |
257 | trace_user_do_sigreturn(env, frame_addr); | |
258 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { | |
259 | goto badframe; | |
260 | } | |
261 | ||
262 | restore_ucontext(env, &frame->uc); | |
56384cf3 | 263 | target_restore_altstack(&frame->uc.uc_stack, get_sp_from_cpustate(env)); |
d2a56bd2 TS |
264 | |
265 | unlock_user_struct(frame, frame_addr, 0); | |
266 | return -TARGET_QEMU_ESIGRETURN; | |
267 | ||
268 | badframe: | |
269 | unlock_user_struct(frame, frame_addr, 0); | |
270 | force_sig(TARGET_SIGSEGV); | |
271 | return 0; | |
272 | } |