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19#include "qemu/osdep.h"
20#include "qemu.h"
21#include "signal-common.h"
22#include "linux-user/trace.h"
23
24struct target_sigcontext {
25 struct target_pt_regs regs;
26 uint32_t oldmask;
27};
28
29struct target_stack_t {
30 abi_ulong ss_sp;
31 int ss_flags;
32 unsigned int ss_size;
33};
34
35struct target_ucontext {
36 abi_ulong tuc_flags;
37 abi_ulong tuc_link;
38 target_stack_t tuc_stack;
39 struct target_sigcontext tuc_mcontext;
40 target_sigset_t tuc_sigmask;
41};
42
43
44struct target_rt_sigframe {
45 target_siginfo_t info;
46 struct target_ucontext uc;
47 uint32_t tramp[2];
48};
49
50static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
51{
52 __put_user(env->regs[0], &sc->regs.r0);
53 __put_user(env->regs[1], &sc->regs.r1);
54 __put_user(env->regs[2], &sc->regs.r2);
55 __put_user(env->regs[3], &sc->regs.r3);
56 __put_user(env->regs[4], &sc->regs.r4);
57 __put_user(env->regs[5], &sc->regs.r5);
58 __put_user(env->regs[6], &sc->regs.r6);
59 __put_user(env->regs[7], &sc->regs.r7);
60 __put_user(env->regs[8], &sc->regs.r8);
61 __put_user(env->regs[9], &sc->regs.r9);
62 __put_user(env->regs[10], &sc->regs.r10);
63 __put_user(env->regs[11], &sc->regs.r11);
64 __put_user(env->regs[12], &sc->regs.r12);
65 __put_user(env->regs[13], &sc->regs.r13);
66 __put_user(env->regs[14], &sc->regs.r14);
67 __put_user(env->regs[15], &sc->regs.r15);
68 __put_user(env->regs[16], &sc->regs.r16);
69 __put_user(env->regs[17], &sc->regs.r17);
70 __put_user(env->regs[18], &sc->regs.r18);
71 __put_user(env->regs[19], &sc->regs.r19);
72 __put_user(env->regs[20], &sc->regs.r20);
73 __put_user(env->regs[21], &sc->regs.r21);
74 __put_user(env->regs[22], &sc->regs.r22);
75 __put_user(env->regs[23], &sc->regs.r23);
76 __put_user(env->regs[24], &sc->regs.r24);
77 __put_user(env->regs[25], &sc->regs.r25);
78 __put_user(env->regs[26], &sc->regs.r26);
79 __put_user(env->regs[27], &sc->regs.r27);
80 __put_user(env->regs[28], &sc->regs.r28);
81 __put_user(env->regs[29], &sc->regs.r29);
82 __put_user(env->regs[30], &sc->regs.r30);
83 __put_user(env->regs[31], &sc->regs.r31);
84 __put_user(env->pc, &sc->regs.pc);
85}
86
87static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
88{
89 __get_user(env->regs[0], &sc->regs.r0);
90 __get_user(env->regs[1], &sc->regs.r1);
91 __get_user(env->regs[2], &sc->regs.r2);
92 __get_user(env->regs[3], &sc->regs.r3);
93 __get_user(env->regs[4], &sc->regs.r4);
94 __get_user(env->regs[5], &sc->regs.r5);
95 __get_user(env->regs[6], &sc->regs.r6);
96 __get_user(env->regs[7], &sc->regs.r7);
97 __get_user(env->regs[8], &sc->regs.r8);
98 __get_user(env->regs[9], &sc->regs.r9);
99 __get_user(env->regs[10], &sc->regs.r10);
100 __get_user(env->regs[11], &sc->regs.r11);
101 __get_user(env->regs[12], &sc->regs.r12);
102 __get_user(env->regs[13], &sc->regs.r13);
103 __get_user(env->regs[14], &sc->regs.r14);
104 __get_user(env->regs[15], &sc->regs.r15);
105 __get_user(env->regs[16], &sc->regs.r16);
106 __get_user(env->regs[17], &sc->regs.r17);
107 __get_user(env->regs[18], &sc->regs.r18);
108 __get_user(env->regs[19], &sc->regs.r19);
109 __get_user(env->regs[20], &sc->regs.r20);
110 __get_user(env->regs[21], &sc->regs.r21);
111 __get_user(env->regs[22], &sc->regs.r22);
112 __get_user(env->regs[23], &sc->regs.r23);
113 __get_user(env->regs[24], &sc->regs.r24);
114 __get_user(env->regs[25], &sc->regs.r25);
115 __get_user(env->regs[26], &sc->regs.r26);
116 __get_user(env->regs[27], &sc->regs.r27);
117 __get_user(env->regs[28], &sc->regs.r28);
118 __get_user(env->regs[29], &sc->regs.r29);
119 __get_user(env->regs[30], &sc->regs.r30);
120 __get_user(env->regs[31], &sc->regs.r31);
121 __get_user(env->pc, &sc->regs.pc);
122}
123
124static abi_ulong get_sigframe(struct target_sigaction *ka,
125 CPUMBState *env, int frame_size)
126{
127 abi_ulong sp = env->regs[1];
128
129 sp = target_sigsp(sp, ka);
130
131 return ((sp - frame_size) & -8UL);
132}
133
134void setup_rt_frame(int sig, struct target_sigaction *ka,
135 target_siginfo_t *info,
136 target_sigset_t *set, CPUMBState *env)
137{
138 struct target_rt_sigframe *frame;
139 abi_ulong frame_addr;
140
141 frame_addr = get_sigframe(ka, env, sizeof *frame);
142 trace_user_setup_rt_frame(env, frame_addr);
143
144 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
145 force_sigsegv(sig);
146 return;
147 }
148
149 tswap_siginfo(&frame->info, info);
150
151 __put_user(0, &frame->uc.tuc_flags);
152 __put_user(0, &frame->uc.tuc_link);
153
154 target_save_altstack(&frame->uc.tuc_stack, env);
155 setup_sigcontext(&frame->uc.tuc_mcontext, env);
156
157 for (int i = 0; i < TARGET_NSIG_WORDS; i++) {
158 __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
159 }
160
161
162
163
164 __put_user(0x31800000U | TARGET_NR_rt_sigreturn, frame->tramp + 0);
165
166 __put_user(0xb9cc0008U, frame->tramp + 1);
167
168
169
170
171
172 env->regs[15] =
173 frame_addr + offsetof(struct target_rt_sigframe, tramp) - 8;
174
175
176 env->regs[1] = frame_addr;
177
178
179 env->regs[5] = sig;
180 env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
181 env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
182
183
184 env->pc = (unsigned long)ka->_sa_handler;
185
186 unlock_user_struct(frame, frame_addr, 1);
187}
188
189
190long do_sigreturn(CPUMBState *env)
191{
192 return -TARGET_ENOSYS;
193}
194
195long do_rt_sigreturn(CPUMBState *env)
196{
197 struct target_rt_sigframe *frame = NULL;
198 abi_ulong frame_addr = env->regs[1];
199 sigset_t set;
200
201 trace_user_do_rt_sigreturn(env, frame_addr);
202
203 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
204 goto badframe;
205 }
206
207 target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
208 set_sigmask(&set);
209
210 restore_sigcontext(&frame->uc.tuc_mcontext, env);
211
212 target_restore_altstack(&frame->uc.tuc_stack, env);
213
214 unlock_user_struct(frame, frame_addr, 0);
215 return -TARGET_QEMU_ESIGRETURN;
216
217 badframe:
218 unlock_user_struct(frame, frame_addr, 0);
219 force_sig(TARGET_SIGSEGV);
220 return -TARGET_QEMU_ESIGRETURN;
221}
222