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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
25struct 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
47struct 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
56struct target_sigframe {
57 struct target_sigcontext sc;
58};
59
60struct 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
69static 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);
91 __put_user(0, &sc->sc_traparg_a1);
92 __put_user(0, &sc->sc_traparg_a2);
93}
94
95static 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
114static 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
125void 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) {
149give_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
162void 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) {
196give_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
209long 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
230badframe:
231 force_sig(TARGET_SIGSEGV);
232 return -QEMU_ESIGRETURN;
233}
234
235long 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
255badframe:
256 unlock_user_struct(frame, frame_addr, 0);
257 force_sig(TARGET_SIGSEGV);
258 return -QEMU_ESIGRETURN;
259}
260
261void 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}
278
