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