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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 | */ | |
19 | #include "qemu/osdep.h" | |
20 | #include "qemu.h" | |
21 | #include "user-internals.h" | |
22 | #include "signal-common.h" | |
23 | #include "linux-user/trace.h" | |
24 | ||
25 | struct target_sigcontext { | |
26 | abi_long sc_onstack; | |
27 | abi_long sc_mask; | |
28 | abi_long sc_pc; | |
29 | abi_long sc_ps; | |
30 | abi_long sc_regs[32]; | |
31 | abi_long sc_ownedfp; | |
32 | abi_long sc_fpregs[32]; | |
33 | abi_ulong sc_fpcr; | |
34 | abi_ulong sc_fp_control; | |
35 | abi_ulong sc_reserved1; | |
36 | abi_ulong sc_reserved2; | |
37 | abi_ulong sc_ssize; | |
38 | abi_ulong sc_sbase; | |
39 | abi_ulong sc_traparg_a0; | |
40 | abi_ulong sc_traparg_a1; | |
41 | abi_ulong sc_traparg_a2; | |
42 | abi_ulong sc_fp_trap_pc; | |
43 | abi_ulong sc_fp_trigger_sum; | |
44 | abi_ulong sc_fp_trigger_inst; | |
45 | }; | |
46 | ||
47 | struct target_ucontext { | |
48 | abi_ulong tuc_flags; | |
49 | abi_ulong tuc_link; | |
50 | abi_ulong tuc_osf_sigmask; | |
51 | target_stack_t tuc_stack; | |
52 | struct target_sigcontext tuc_mcontext; | |
53 | target_sigset_t tuc_sigmask; | |
54 | }; | |
55 | ||
56 | struct target_sigframe { | |
57 | struct target_sigcontext sc; | |
58 | }; | |
59 | ||
60 | struct target_rt_sigframe { | |
61 | target_siginfo_t info; | |
62 | struct target_ucontext uc; | |
63 | }; | |
64 | ||
65 | #define INSN_MOV_R30_R16 0x47fe0410 | |
66 | #define INSN_LDI_R0 0x201f0000 | |
67 | #define INSN_CALLSYS 0x00000083 | |
68 | ||
69 | static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env, | |
70 | abi_ulong frame_addr, target_sigset_t *set) | |
71 | { | |
72 | int i; | |
73 | ||
74 | __put_user(on_sig_stack(frame_addr), &sc->sc_onstack); | |
75 | __put_user(set->sig[0], &sc->sc_mask); | |
76 | __put_user(env->pc, &sc->sc_pc); | |
77 | __put_user(8, &sc->sc_ps); | |
78 | ||
79 | for (i = 0; i < 31; ++i) { | |
80 | __put_user(env->ir[i], &sc->sc_regs[i]); | |
81 | } | |
82 | __put_user(0, &sc->sc_regs[31]); | |
83 | ||
84 | for (i = 0; i < 31; ++i) { | |
85 | __put_user(env->fir[i], &sc->sc_fpregs[i]); | |
86 | } | |
87 | __put_user(0, &sc->sc_fpregs[31]); | |
88 | __put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr); | |
89 | ||
90 | __put_user(0, &sc->sc_traparg_a0); /* FIXME */ | |
91 | __put_user(0, &sc->sc_traparg_a1); /* FIXME */ | |
92 | __put_user(0, &sc->sc_traparg_a2); /* FIXME */ | |
93 | } | |
94 | ||
95 | static void restore_sigcontext(CPUAlphaState *env, | |
96 | struct target_sigcontext *sc) | |
97 | { | |
98 | uint64_t fpcr; | |
99 | int i; | |
100 | ||
101 | __get_user(env->pc, &sc->sc_pc); | |
102 | ||
103 | for (i = 0; i < 31; ++i) { | |
104 | __get_user(env->ir[i], &sc->sc_regs[i]); | |
105 | } | |
106 | for (i = 0; i < 31; ++i) { | |
107 | __get_user(env->fir[i], &sc->sc_fpregs[i]); | |
108 | } | |
109 | ||
110 | __get_user(fpcr, &sc->sc_fpcr); | |
111 | cpu_alpha_store_fpcr(env, fpcr); | |
112 | } | |
113 | ||
114 | static inline abi_ulong get_sigframe(struct target_sigaction *sa, | |
115 | CPUAlphaState *env, | |
116 | unsigned long framesize) | |
117 | { | |
118 | abi_ulong sp; | |
119 | ||
120 | sp = target_sigsp(get_sp_from_cpustate(env), sa); | |
121 | ||
122 | return (sp - framesize) & -32; | |
123 | } | |
124 | ||
125 | void setup_frame(int sig, struct target_sigaction *ka, | |
126 | target_sigset_t *set, CPUAlphaState *env) | |
127 | { | |
128 | abi_ulong frame_addr, r26; | |
129 | struct target_sigframe *frame; | |
130 | int err = 0; | |
131 | ||
132 | frame_addr = get_sigframe(ka, env, sizeof(*frame)); | |
133 | trace_user_setup_frame(env, frame_addr); | |
134 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
135 | goto give_sigsegv; | |
136 | } | |
137 | ||
138 | setup_sigcontext(&frame->sc, env, frame_addr, set); | |
139 | ||
140 | if (ka->ka_restorer) { | |
141 | r26 = ka->ka_restorer; | |
142 | } else { | |
143 | r26 = default_sigreturn; | |
144 | } | |
145 | ||
146 | unlock_user_struct(frame, frame_addr, 1); | |
147 | ||
148 | if (err) { | |
149 | give_sigsegv: | |
150 | force_sigsegv(sig); | |
151 | return; | |
152 | } | |
153 | ||
154 | env->ir[IR_RA] = r26; | |
155 | env->ir[IR_PV] = env->pc = ka->_sa_handler; | |
156 | env->ir[IR_A0] = sig; | |
157 | env->ir[IR_A1] = 0; | |
158 | env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc); | |
159 | env->ir[IR_SP] = frame_addr; | |
160 | } | |
161 | ||
162 | void setup_rt_frame(int sig, struct target_sigaction *ka, | |
163 | target_siginfo_t *info, | |
164 | target_sigset_t *set, CPUAlphaState *env) | |
165 | { | |
166 | abi_ulong frame_addr, r26; | |
167 | struct target_rt_sigframe *frame; | |
168 | int i, err = 0; | |
169 | ||
170 | frame_addr = get_sigframe(ka, env, sizeof(*frame)); | |
171 | trace_user_setup_rt_frame(env, frame_addr); | |
172 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
173 | goto give_sigsegv; | |
174 | } | |
175 | ||
176 | tswap_siginfo(&frame->info, info); | |
177 | ||
178 | __put_user(0, &frame->uc.tuc_flags); | |
179 | __put_user(0, &frame->uc.tuc_link); | |
180 | __put_user(set->sig[0], &frame->uc.tuc_osf_sigmask); | |
181 | ||
182 | target_save_altstack(&frame->uc.tuc_stack, env); | |
183 | ||
184 | setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set); | |
185 | for (i = 0; i < TARGET_NSIG_WORDS; ++i) { | |
186 | __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]); | |
187 | } | |
188 | ||
189 | if (ka->ka_restorer) { | |
190 | r26 = ka->ka_restorer; | |
191 | } else { | |
192 | r26 = default_rt_sigreturn; | |
193 | } | |
194 | ||
195 | if (err) { | |
196 | give_sigsegv: | |
197 | force_sigsegv(sig); | |
198 | return; | |
199 | } | |
200 | ||
201 | env->ir[IR_RA] = r26; | |
202 | env->ir[IR_PV] = env->pc = ka->_sa_handler; | |
203 | env->ir[IR_A0] = sig; | |
204 | env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info); | |
205 | env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc); | |
206 | env->ir[IR_SP] = frame_addr; | |
207 | } | |
208 | ||
209 | long do_sigreturn(CPUAlphaState *env) | |
210 | { | |
211 | struct target_sigcontext *sc; | |
212 | abi_ulong sc_addr = env->ir[IR_A0]; | |
213 | target_sigset_t target_set; | |
214 | sigset_t set; | |
215 | ||
216 | if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) { | |
217 | goto badframe; | |
218 | } | |
219 | ||
220 | target_sigemptyset(&target_set); | |
221 | __get_user(target_set.sig[0], &sc->sc_mask); | |
222 | ||
223 | target_to_host_sigset_internal(&set, &target_set); | |
224 | set_sigmask(&set); | |
225 | ||
226 | restore_sigcontext(env, sc); | |
227 | unlock_user_struct(sc, sc_addr, 0); | |
228 | return -QEMU_ESIGRETURN; | |
229 | ||
230 | badframe: | |
231 | force_sig(TARGET_SIGSEGV); | |
232 | return -QEMU_ESIGRETURN; | |
233 | } | |
234 | ||
235 | long do_rt_sigreturn(CPUAlphaState *env) | |
236 | { | |
237 | abi_ulong frame_addr = env->ir[IR_A0]; | |
238 | struct target_rt_sigframe *frame; | |
239 | sigset_t set; | |
240 | ||
241 | trace_user_do_rt_sigreturn(env, frame_addr); | |
242 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { | |
243 | goto badframe; | |
244 | } | |
245 | target_to_host_sigset(&set, &frame->uc.tuc_sigmask); | |
246 | set_sigmask(&set); | |
247 | ||
248 | restore_sigcontext(env, &frame->uc.tuc_mcontext); | |
249 | target_restore_altstack(&frame->uc.tuc_stack, env); | |
250 | ||
251 | unlock_user_struct(frame, frame_addr, 0); | |
252 | return -QEMU_ESIGRETURN; | |
253 | ||
254 | ||
255 | badframe: | |
256 | unlock_user_struct(frame, frame_addr, 0); | |
257 | force_sig(TARGET_SIGSEGV); | |
258 | return -QEMU_ESIGRETURN; | |
259 | } | |
260 | ||
261 | void setup_sigtramp(abi_ulong sigtramp_page) | |
262 | { | |
263 | uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 * 4, 0); | |
264 | assert(tramp != NULL); | |
265 | ||
266 | default_sigreturn = sigtramp_page; | |
267 | __put_user(INSN_MOV_R30_R16, &tramp[0]); | |
268 | __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]); | |
269 | __put_user(INSN_CALLSYS, &tramp[2]); | |
270 | ||
271 | default_rt_sigreturn = sigtramp_page + 3 * 4; | |
272 | __put_user(INSN_MOV_R30_R16, &tramp[3]); | |
273 | __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]); | |
274 | __put_user(INSN_CALLSYS, &tramp[5]); | |
275 | ||
276 | unlock_user(tramp, sigtramp_page, 6 * 4); | |
277 | } |