qemu/linux-user/alpha/signal.c
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   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
  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); /* FIXME */
  91    __put_user(0, &sc->sc_traparg_a1); /* FIXME */
  92    __put_user(0, &sc->sc_traparg_a2); /* FIXME */
  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