Merge remote-tracking branch 'remotes/marcandre/tags/rtd-pull-request' into staging
[qemu.git] / linux-user / hexagon / signal.c
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);
263
264 if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
265 uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) {
266 goto badframe;
267 }
268
269 unlock_user_struct(frame, frame_addr, 0);
270 return -TARGET_QEMU_ESIGRETURN;
271
272 badframe:
273 unlock_user_struct(frame, frame_addr, 0);
274 force_sig(TARGET_SIGSEGV);
275 return 0;
276 }