LXR qemu/linux-user/microblaze/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
  25struct target_sigcontext {
  26    struct target_pt_regs regs;  /* needs to be first */
  27    uint32_t oldmask;
  28};
  29
  30struct target_stack_t {
  31    abi_ulong ss_sp;
  32    int ss_flags;
  33    unsigned int ss_size;
  34};
  35
  36struct target_ucontext {
  37    abi_ulong tuc_flags;
  38    abi_ulong tuc_link;
  39    target_stack_t tuc_stack;
  40    struct target_sigcontext tuc_mcontext;
  41    target_sigset_t tuc_sigmask;
  42};
  43
  44/* Signal frames. */
  45struct target_rt_sigframe {
  46    target_siginfo_t info;
  47    struct target_ucontext uc;
  48    uint32_t tramp[2];
  49};
  50
  51static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
  52{
  53    __put_user(env->regs[0], &sc->regs.r0);
  54    __put_user(env->regs[1], &sc->regs.r1);
  55    __put_user(env->regs[2], &sc->regs.r2);
  56    __put_user(env->regs[3], &sc->regs.r3);
  57    __put_user(env->regs[4], &sc->regs.r4);
  58    __put_user(env->regs[5], &sc->regs.r5);
  59    __put_user(env->regs[6], &sc->regs.r6);
  60    __put_user(env->regs[7], &sc->regs.r7);
  61    __put_user(env->regs[8], &sc->regs.r8);
  62    __put_user(env->regs[9], &sc->regs.r9);
  63    __put_user(env->regs[10], &sc->regs.r10);
  64    __put_user(env->regs[11], &sc->regs.r11);
  65    __put_user(env->regs[12], &sc->regs.r12);
  66    __put_user(env->regs[13], &sc->regs.r13);
  67    __put_user(env->regs[14], &sc->regs.r14);
  68    __put_user(env->regs[15], &sc->regs.r15);
  69    __put_user(env->regs[16], &sc->regs.r16);
  70    __put_user(env->regs[17], &sc->regs.r17);
  71    __put_user(env->regs[18], &sc->regs.r18);
  72    __put_user(env->regs[19], &sc->regs.r19);
  73    __put_user(env->regs[20], &sc->regs.r20);
  74    __put_user(env->regs[21], &sc->regs.r21);
  75    __put_user(env->regs[22], &sc->regs.r22);
  76    __put_user(env->regs[23], &sc->regs.r23);
  77    __put_user(env->regs[24], &sc->regs.r24);
  78    __put_user(env->regs[25], &sc->regs.r25);
  79    __put_user(env->regs[26], &sc->regs.r26);
  80    __put_user(env->regs[27], &sc->regs.r27);
  81    __put_user(env->regs[28], &sc->regs.r28);
  82    __put_user(env->regs[29], &sc->regs.r29);
  83    __put_user(env->regs[30], &sc->regs.r30);
  84    __put_user(env->regs[31], &sc->regs.r31);
  85    __put_user(env->pc, &sc->regs.pc);
  86}
  87
  88static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
  89{
  90    __get_user(env->regs[0], &sc->regs.r0);
  91    __get_user(env->regs[1], &sc->regs.r1);
  92    __get_user(env->regs[2], &sc->regs.r2);
  93    __get_user(env->regs[3], &sc->regs.r3);
  94    __get_user(env->regs[4], &sc->regs.r4);
  95    __get_user(env->regs[5], &sc->regs.r5);
  96    __get_user(env->regs[6], &sc->regs.r6);
  97    __get_user(env->regs[7], &sc->regs.r7);
  98    __get_user(env->regs[8], &sc->regs.r8);
  99    __get_user(env->regs[9], &sc->regs.r9);
 100    __get_user(env->regs[10], &sc->regs.r10);
 101    __get_user(env->regs[11], &sc->regs.r11);
 102    __get_user(env->regs[12], &sc->regs.r12);
 103    __get_user(env->regs[13], &sc->regs.r13);
 104    __get_user(env->regs[14], &sc->regs.r14);
 105    __get_user(env->regs[15], &sc->regs.r15);
 106    __get_user(env->regs[16], &sc->regs.r16);
 107    __get_user(env->regs[17], &sc->regs.r17);
 108    __get_user(env->regs[18], &sc->regs.r18);
 109    __get_user(env->regs[19], &sc->regs.r19);
 110    __get_user(env->regs[20], &sc->regs.r20);
 111    __get_user(env->regs[21], &sc->regs.r21);
 112    __get_user(env->regs[22], &sc->regs.r22);
 113    __get_user(env->regs[23], &sc->regs.r23);
 114    __get_user(env->regs[24], &sc->regs.r24);
 115    __get_user(env->regs[25], &sc->regs.r25);
 116    __get_user(env->regs[26], &sc->regs.r26);
 117    __get_user(env->regs[27], &sc->regs.r27);
 118    __get_user(env->regs[28], &sc->regs.r28);
 119    __get_user(env->regs[29], &sc->regs.r29);
 120    __get_user(env->regs[30], &sc->regs.r30);
 121    __get_user(env->regs[31], &sc->regs.r31);
 122    __get_user(env->pc, &sc->regs.pc);
 123}
 124
 125static abi_ulong get_sigframe(struct target_sigaction *ka,
 126                              CPUMBState *env, int frame_size)
 127{
 128    abi_ulong sp = env->regs[1];
 129
 130    sp = target_sigsp(sp, ka);
 131
 132    return ((sp - frame_size) & -8UL);
 133}
 134
 135void setup_rt_frame(int sig, struct target_sigaction *ka,
 136                    target_siginfo_t *info,
 137                    target_sigset_t *set, CPUMBState *env)
 138{
 139    struct target_rt_sigframe *frame;
 140    abi_ulong frame_addr;
 141
 142    frame_addr = get_sigframe(ka, env, sizeof *frame);
 143    trace_user_setup_rt_frame(env, frame_addr);
 144
 145    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
 146        force_sigsegv(sig);
 147        return;
 148    }
 149
 150    tswap_siginfo(&frame->info, info);
 151
 152    __put_user(0, &frame->uc.tuc_flags);
 153    __put_user(0, &frame->uc.tuc_link);
 154
 155    target_save_altstack(&frame->uc.tuc_stack, env);
 156    setup_sigcontext(&frame->uc.tuc_mcontext, env);
 157
 158    for (int i = 0; i < TARGET_NSIG_WORDS; i++) {
 159        __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
 160    }
 161
 162    /* Kernel does not use SA_RESTORER. */
 163
 164    /*
 165     * Return from sighandler will jump to the tramp.
 166     * Negative 8 offset because return is rtsd r15, 8
 167     */
 168    env->regs[15] = default_rt_sigreturn - 8;
 169
 170    /* Set up registers for signal handler */
 171    env->regs[1] = frame_addr;
 172
 173    /* Signal handler args: */
 174    env->regs[5] = sig;
 175    env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, info);
 176    env->regs[7] = frame_addr + offsetof(struct target_rt_sigframe, uc);
 177
 178    /* Offset to handle microblaze rtid r14, 0 */
 179    env->pc = (unsigned long)ka->_sa_handler;
 180
 181    unlock_user_struct(frame, frame_addr, 1);
 182}
 183
 184
 185long do_sigreturn(CPUMBState *env)
 186{
 187    return -TARGET_ENOSYS;
 188}
 189
 190long do_rt_sigreturn(CPUMBState *env)
 191{
 192    struct target_rt_sigframe *frame = NULL;
 193    abi_ulong frame_addr = env->regs[1];
 194    sigset_t set;
 195
 196    trace_user_do_rt_sigreturn(env, frame_addr);
 197
 198    if  (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
 199        goto badframe;
 200    }
 201
 202    target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
 203    set_sigmask(&set);
 204
 205    restore_sigcontext(&frame->uc.tuc_mcontext, env);
 206
 207    target_restore_altstack(&frame->uc.tuc_stack, env);
 208
 209    unlock_user_struct(frame, frame_addr, 0);
 210    return -TARGET_QEMU_ESIGRETURN;
 211
 212 badframe:
 213    unlock_user_struct(frame, frame_addr, 0);
 214    force_sig(TARGET_SIGSEGV);
 215    return -TARGET_QEMU_ESIGRETURN;
 216}
 217
 218void setup_sigtramp(abi_ulong sigtramp_page)
 219{
 220    uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 8, 0);
 221    assert(tramp != NULL);
 222
 223    /*
 224     * addi r12, r0, __NR_rt_sigreturn
 225     * brki r14, 0x8
 226     */
 227    __put_user(0x31800000U | TARGET_NR_rt_sigreturn, tramp);
 228    __put_user(0xb9cc0008U, tramp + 1);
 229
 230    default_rt_sigreturn = sigtramp_page;
 231    unlock_user(tramp, sigtramp_page, 8);
 232}
 233