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befb7447 LV |
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 | */ | |
aca77d5e LV |
19 | #include "qemu/osdep.h" |
20 | #include "qemu.h" | |
3b249d26 | 21 | #include "user-internals.h" |
aca77d5e LV |
22 | #include "signal-common.h" |
23 | #include "linux-user/trace.h" | |
24 | ||
25 | struct target_sigcontext { | |
26 | abi_ulong sc_flags; | |
27 | abi_ulong sc_gr[32]; | |
28 | uint64_t sc_fr[32]; | |
29 | abi_ulong sc_iasq[2]; | |
30 | abi_ulong sc_iaoq[2]; | |
31 | abi_ulong sc_sar; | |
32 | }; | |
33 | ||
34 | struct target_ucontext { | |
35 | abi_uint tuc_flags; | |
36 | abi_ulong tuc_link; | |
37 | target_stack_t tuc_stack; | |
38 | abi_uint pad[1]; | |
39 | struct target_sigcontext tuc_mcontext; | |
40 | target_sigset_t tuc_sigmask; | |
41 | }; | |
42 | ||
43 | struct target_rt_sigframe { | |
47393189 | 44 | abi_uint tramp[2]; /* syscall restart return address */ |
aca77d5e LV |
45 | target_siginfo_t info; |
46 | struct target_ucontext uc; | |
47 | /* hidden location of upper halves of pa2.0 64-bit gregs */ | |
48 | }; | |
49 | ||
50 | static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env) | |
51 | { | |
52 | int flags = 0; | |
53 | int i; | |
54 | ||
55 | /* ??? if on_sig_stack, flags |= 1 (PARISC_SC_FLAG_ONSTACK). */ | |
56 | ||
57 | if (env->iaoq_f < TARGET_PAGE_SIZE) { | |
58 | /* In the gateway page, executing a syscall. */ | |
59 | flags |= 2; /* PARISC_SC_FLAG_IN_SYSCALL */ | |
60 | __put_user(env->gr[31], &sc->sc_iaoq[0]); | |
61 | __put_user(env->gr[31] + 4, &sc->sc_iaoq[1]); | |
62 | } else { | |
63 | __put_user(env->iaoq_f, &sc->sc_iaoq[0]); | |
64 | __put_user(env->iaoq_b, &sc->sc_iaoq[1]); | |
65 | } | |
66 | __put_user(0, &sc->sc_iasq[0]); | |
67 | __put_user(0, &sc->sc_iasq[1]); | |
68 | __put_user(flags, &sc->sc_flags); | |
69 | ||
70 | __put_user(cpu_hppa_get_psw(env), &sc->sc_gr[0]); | |
71 | for (i = 1; i < 32; ++i) { | |
72 | __put_user(env->gr[i], &sc->sc_gr[i]); | |
73 | } | |
74 | ||
75 | __put_user((uint64_t)env->fr0_shadow << 32, &sc->sc_fr[0]); | |
76 | for (i = 1; i < 32; ++i) { | |
77 | __put_user(env->fr[i], &sc->sc_fr[i]); | |
78 | } | |
79 | ||
80 | __put_user(env->cr[CR_SAR], &sc->sc_sar); | |
81 | } | |
82 | ||
83 | static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) | |
84 | { | |
85 | target_ulong psw; | |
86 | int i; | |
87 | ||
88 | __get_user(psw, &sc->sc_gr[0]); | |
89 | cpu_hppa_put_psw(env, psw); | |
90 | ||
91 | for (i = 1; i < 32; ++i) { | |
92 | __get_user(env->gr[i], &sc->sc_gr[i]); | |
93 | } | |
94 | for (i = 0; i < 32; ++i) { | |
95 | __get_user(env->fr[i], &sc->sc_fr[i]); | |
96 | } | |
97 | cpu_hppa_loaded_fr0(env); | |
98 | ||
99 | __get_user(env->iaoq_f, &sc->sc_iaoq[0]); | |
100 | __get_user(env->iaoq_b, &sc->sc_iaoq[1]); | |
101 | __get_user(env->cr[CR_SAR], &sc->sc_sar); | |
102 | } | |
103 | ||
47393189 HD |
104 | #if TARGET_ABI_BITS == 32 |
105 | #define SIGFRAME 64 | |
106 | #define FUNCTIONCALLFRAME 48 | |
107 | #else | |
108 | #define SIGFRAME 128 | |
109 | #define FUNCTIONCALLFRAME 96 | |
110 | #endif | |
aca77d5e | 111 | #define PARISC_RT_SIGFRAME_SIZE32 \ |
47393189 | 112 | ((sizeof(struct target_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) |
aca77d5e LV |
113 | |
114 | void setup_rt_frame(int sig, struct target_sigaction *ka, | |
115 | target_siginfo_t *info, | |
116 | target_sigset_t *set, CPUArchState *env) | |
117 | { | |
118 | abi_ulong frame_addr, sp, haddr; | |
119 | struct target_rt_sigframe *frame; | |
120 | int i; | |
5bfce0b7 | 121 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
aca77d5e | 122 | |
465e237b LV |
123 | sp = get_sp_from_cpustate(env); |
124 | if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { | |
5bfce0b7 | 125 | sp = (ts->sigaltstack_used.ss_sp + 0x7f) & ~0x3f; |
aca77d5e | 126 | } |
47393189 | 127 | frame_addr = QEMU_ALIGN_UP(sp, SIGFRAME); |
aca77d5e LV |
128 | sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32; |
129 | ||
130 | trace_user_setup_rt_frame(env, frame_addr); | |
131 | ||
132 | if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { | |
133 | goto give_sigsegv; | |
134 | } | |
135 | ||
136 | tswap_siginfo(&frame->info, info); | |
137 | frame->uc.tuc_flags = 0; | |
138 | frame->uc.tuc_link = 0; | |
139 | ||
465e237b | 140 | target_save_altstack(&frame->uc.tuc_stack, env); |
aca77d5e LV |
141 | |
142 | for (i = 0; i < TARGET_NSIG_WORDS; i++) { | |
143 | __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]); | |
144 | } | |
145 | ||
146 | setup_sigcontext(&frame->uc.tuc_mcontext, env); | |
147 | ||
aca77d5e LV |
148 | unlock_user_struct(frame, frame_addr, 1); |
149 | ||
47393189 | 150 | env->gr[2] = default_rt_sigreturn; |
aca77d5e LV |
151 | env->gr[30] = sp; |
152 | env->gr[26] = sig; | |
153 | env->gr[25] = h2g(&frame->info); | |
154 | env->gr[24] = h2g(&frame->uc); | |
155 | ||
156 | haddr = ka->_sa_handler; | |
157 | if (haddr & 2) { | |
158 | /* Function descriptor. */ | |
159 | target_ulong *fdesc, dest; | |
160 | ||
161 | haddr &= -4; | |
162 | if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) { | |
163 | goto give_sigsegv; | |
164 | } | |
165 | __get_user(dest, fdesc); | |
166 | __get_user(env->gr[19], fdesc + 1); | |
167 | unlock_user_struct(fdesc, haddr, 1); | |
168 | haddr = dest; | |
169 | } | |
170 | env->iaoq_f = haddr; | |
171 | env->iaoq_b = haddr + 4; | |
172 | return; | |
173 | ||
174 | give_sigsegv: | |
175 | force_sigsegv(sig); | |
176 | } | |
177 | ||
178 | long do_rt_sigreturn(CPUArchState *env) | |
179 | { | |
180 | abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32; | |
181 | struct target_rt_sigframe *frame; | |
182 | sigset_t set; | |
183 | ||
184 | trace_user_do_rt_sigreturn(env, frame_addr); | |
185 | if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { | |
186 | goto badframe; | |
187 | } | |
188 | target_to_host_sigset(&set, &frame->uc.tuc_sigmask); | |
189 | set_sigmask(&set); | |
190 | ||
191 | restore_sigcontext(env, &frame->uc.tuc_mcontext); | |
ddc3e74d | 192 | target_restore_altstack(&frame->uc.tuc_stack, env); |
aca77d5e LV |
193 | |
194 | unlock_user_struct(frame, frame_addr, 0); | |
57a0c938 | 195 | return -QEMU_ESIGRETURN; |
aca77d5e LV |
196 | |
197 | badframe: | |
198 | force_sig(TARGET_SIGSEGV); | |
57a0c938 | 199 | return -QEMU_ESIGRETURN; |
aca77d5e | 200 | } |
47393189 HD |
201 | |
202 | void setup_sigtramp(abi_ulong sigtramp_page) | |
203 | { | |
204 | uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6*4, 0); | |
205 | abi_ulong SIGFRAME_CONTEXT_REGS32; | |
206 | assert(tramp != NULL); | |
207 | ||
208 | SIGFRAME_CONTEXT_REGS32 = offsetof(struct target_rt_sigframe, uc.tuc_mcontext); | |
209 | SIGFRAME_CONTEXT_REGS32 -= PARISC_RT_SIGFRAME_SIZE32; | |
210 | ||
211 | __put_user(SIGFRAME_CONTEXT_REGS32, tramp + 0); | |
212 | __put_user(0x08000240, tramp + 1); /* nop - b/c dwarf2 unwind routines */ | |
213 | __put_user(0x34190000, tramp + 2); /* ldi 0, %r25 (in_syscall=0) */ | |
214 | __put_user(0x3414015a, tramp + 3); /* ldi __NR_rt_sigreturn, %r20 */ | |
215 | __put_user(0xe4008200, tramp + 4); /* ble 0x100(%sr2, %r0) */ | |
216 | __put_user(0x08000240, tramp + 5); /* nop */ | |
217 | ||
218 | default_rt_sigreturn = (sigtramp_page + 8) | 3; | |
219 | unlock_user(tramp, sigtramp_page, 6*4); | |
220 | } |