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 "target_signal.h"
  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 {
  44     abi_uint tramp[9];
  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
 104 /* No, this doesn't look right, but it's copied straight from the kernel.  */
 105 #define PARISC_RT_SIGFRAME_SIZE32 \
 106     ((sizeof(struct target_rt_sigframe) + 48 + 64) & -64)
 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
 116     sp = get_sp_from_cpustate(env);
 117     if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
 118         sp = (target_sigaltstack_used.ss_sp + 0x7f) & ~0x3f;
 119     }
 120     frame_addr = QEMU_ALIGN_UP(sp, 64);
 121     sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32;
 122
 123     trace_user_setup_rt_frame(env, frame_addr);
 124
 125     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 126         goto give_sigsegv;
 127     }
 128
 129     tswap_siginfo(&frame->info, info);
 130     frame->uc.tuc_flags = 0;
 131     frame->uc.tuc_link = 0;
 132
 133     target_save_altstack(&frame->uc.tuc_stack, env);
 134
 135     for (i = 0; i < TARGET_NSIG_WORDS; i++) {
 136         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 137     }
 138
 139     setup_sigcontext(&frame->uc.tuc_mcontext, env);
 140
 141     __put_user(0x34190000, frame->tramp + 0); /* ldi 0,%r25 */
 142     __put_user(0x3414015a, frame->tramp + 1); /* ldi __NR_rt_sigreturn,%r20 */
 143     __put_user(0xe4008200, frame->tramp + 2); /* be,l 0x100(%sr2,%r0) */
 144     __put_user(0x08000240, frame->tramp + 3); /* nop */
 145
 146     unlock_user_struct(frame, frame_addr, 1);
 147
 148     env->gr[2] = h2g(frame->tramp);
 149     env->gr[30] = sp;
 150     env->gr[26] = sig;
 151     env->gr[25] = h2g(&frame->info);
 152     env->gr[24] = h2g(&frame->uc);
 153
 154     haddr = ka->_sa_handler;
 155     if (haddr & 2) {
 156         /* Function descriptor.  */
 157         target_ulong *fdesc, dest;
 158
 159         haddr &= -4;
 160         if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) {
 161             goto give_sigsegv;
 162         }
 163         __get_user(dest, fdesc);
 164         __get_user(env->gr[19], fdesc + 1);
 165         unlock_user_struct(fdesc, haddr, 1);
 166         haddr = dest;
 167     }
 168     env->iaoq_f = haddr;
 169     env->iaoq_b = haddr + 4;
 170     return;
 171
 172  give_sigsegv:
 173     force_sigsegv(sig);
 174 }
 175
 176 long do_rt_sigreturn(CPUArchState *env)
 177 {
 178     abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32;
 179     struct target_rt_sigframe *frame;
 180     sigset_t set;
 181
 182     trace_user_do_rt_sigreturn(env, frame_addr);
 183     if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 184         goto badframe;
 185     }
 186     target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
 187     set_sigmask(&set);
 188
 189     restore_sigcontext(env, &frame->uc.tuc_mcontext);
 190     unlock_user_struct(frame, frame_addr, 0);
 191
 192     if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
 193                                              uc.tuc_stack),
 194                        0, env->gr[30]) == -EFAULT) {
 195         goto badframe;
 196     }
 197
 198     unlock_user_struct(frame, frame_addr, 0);
 199     return -TARGET_QEMU_ESIGRETURN;
 200
 201  badframe:
 202     force_sig(TARGET_SIGSEGV);
 203     return -TARGET_QEMU_ESIGRETURN;
 204 }