linux-user/hppa/signal.c

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