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 "signal-common.h"
  22 #include "linux-user/trace.h"
  23
  24 struct target_sigcontext {
  25     struct target_pt_regs regs;  /* needs to be first */
  26     uint32_t oldmask;
  27 };
  28
  29 struct target_stack_t {
  30     abi_ulong ss_sp;
  31     int ss_flags;
  32     unsigned int ss_size;
  33 };
  34
  35 struct target_ucontext {
  36     abi_ulong tuc_flags;
  37     abi_ulong tuc_link;
  38     struct target_stack_t tuc_stack;
  39     struct target_sigcontext tuc_mcontext;
  40     uint32_t tuc_extramask[TARGET_NSIG_WORDS - 1];
  41 };
  42
  43 /* Signal frames. */
  44 struct target_signal_frame {
  45     struct target_ucontext uc;
  46     uint32_t extramask[TARGET_NSIG_WORDS - 1];
  47     uint32_t tramp[2];
  48 };
  49
  50 struct rt_signal_frame {
  51     siginfo_t info;
  52     ucontext_t uc;
  53     uint32_t tramp[2];
  54 };
  55
  56 static void setup_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
  57 {
  58     __put_user(env->regs[0], &sc->regs.r0);
  59     __put_user(env->regs[1], &sc->regs.r1);
  60     __put_user(env->regs[2], &sc->regs.r2);
  61     __put_user(env->regs[3], &sc->regs.r3);
  62     __put_user(env->regs[4], &sc->regs.r4);
  63     __put_user(env->regs[5], &sc->regs.r5);
  64     __put_user(env->regs[6], &sc->regs.r6);
  65     __put_user(env->regs[7], &sc->regs.r7);
  66     __put_user(env->regs[8], &sc->regs.r8);
  67     __put_user(env->regs[9], &sc->regs.r9);
  68     __put_user(env->regs[10], &sc->regs.r10);
  69     __put_user(env->regs[11], &sc->regs.r11);
  70     __put_user(env->regs[12], &sc->regs.r12);
  71     __put_user(env->regs[13], &sc->regs.r13);
  72     __put_user(env->regs[14], &sc->regs.r14);
  73     __put_user(env->regs[15], &sc->regs.r15);
  74     __put_user(env->regs[16], &sc->regs.r16);
  75     __put_user(env->regs[17], &sc->regs.r17);
  76     __put_user(env->regs[18], &sc->regs.r18);
  77     __put_user(env->regs[19], &sc->regs.r19);
  78     __put_user(env->regs[20], &sc->regs.r20);
  79     __put_user(env->regs[21], &sc->regs.r21);
  80     __put_user(env->regs[22], &sc->regs.r22);
  81     __put_user(env->regs[23], &sc->regs.r23);
  82     __put_user(env->regs[24], &sc->regs.r24);
  83     __put_user(env->regs[25], &sc->regs.r25);
  84     __put_user(env->regs[26], &sc->regs.r26);
  85     __put_user(env->regs[27], &sc->regs.r27);
  86     __put_user(env->regs[28], &sc->regs.r28);
  87     __put_user(env->regs[29], &sc->regs.r29);
  88     __put_user(env->regs[30], &sc->regs.r30);
  89     __put_user(env->regs[31], &sc->regs.r31);
  90     __put_user(env->sregs[SR_PC], &sc->regs.pc);
  91 }
  92
  93 static void restore_sigcontext(struct target_sigcontext *sc, CPUMBState *env)
  94 {
  95     __get_user(env->regs[0], &sc->regs.r0);
  96     __get_user(env->regs[1], &sc->regs.r1);
  97     __get_user(env->regs[2], &sc->regs.r2);
  98     __get_user(env->regs[3], &sc->regs.r3);
  99     __get_user(env->regs[4], &sc->regs.r4);
 100     __get_user(env->regs[5], &sc->regs.r5);
 101     __get_user(env->regs[6], &sc->regs.r6);
 102     __get_user(env->regs[7], &sc->regs.r7);
 103     __get_user(env->regs[8], &sc->regs.r8);
 104     __get_user(env->regs[9], &sc->regs.r9);
 105     __get_user(env->regs[10], &sc->regs.r10);
 106     __get_user(env->regs[11], &sc->regs.r11);
 107     __get_user(env->regs[12], &sc->regs.r12);
 108     __get_user(env->regs[13], &sc->regs.r13);
 109     __get_user(env->regs[14], &sc->regs.r14);
 110     __get_user(env->regs[15], &sc->regs.r15);
 111     __get_user(env->regs[16], &sc->regs.r16);
 112     __get_user(env->regs[17], &sc->regs.r17);
 113     __get_user(env->regs[18], &sc->regs.r18);
 114     __get_user(env->regs[19], &sc->regs.r19);
 115     __get_user(env->regs[20], &sc->regs.r20);
 116     __get_user(env->regs[21], &sc->regs.r21);
 117     __get_user(env->regs[22], &sc->regs.r22);
 118     __get_user(env->regs[23], &sc->regs.r23);
 119     __get_user(env->regs[24], &sc->regs.r24);
 120     __get_user(env->regs[25], &sc->regs.r25);
 121     __get_user(env->regs[26], &sc->regs.r26);
 122     __get_user(env->regs[27], &sc->regs.r27);
 123     __get_user(env->regs[28], &sc->regs.r28);
 124     __get_user(env->regs[29], &sc->regs.r29);
 125     __get_user(env->regs[30], &sc->regs.r30);
 126     __get_user(env->regs[31], &sc->regs.r31);
 127     __get_user(env->sregs[SR_PC], &sc->regs.pc);
 128 }
 129
 130 static abi_ulong get_sigframe(struct target_sigaction *ka,
 131                               CPUMBState *env, int frame_size)
 132 {
 133     abi_ulong sp = env->regs[1];
 134
 135     sp = target_sigsp(sp, ka);
 136
 137     return ((sp - frame_size) & -8UL);
 138 }
 139
 140 void setup_frame(int sig, struct target_sigaction *ka,
 141                  target_sigset_t *set, CPUMBState *env)
 142 {
 143     struct target_signal_frame *frame;
 144     abi_ulong frame_addr;
 145     int i;
 146
 147     frame_addr = get_sigframe(ka, env, sizeof *frame);
 148     trace_user_setup_frame(env, frame_addr);
 149     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
 150         goto badframe;
 151
 152     /* Save the mask.  */
 153     __put_user(set->sig[0], &frame->uc.tuc_mcontext.oldmask);
 154
 155     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 156         __put_user(set->sig[i], &frame->extramask[i - 1]);
 157     }
 158
 159     setup_sigcontext(&frame->uc.tuc_mcontext, env);
 160
 161     /* Set up to return from userspace. If provided, use a stub
 162        already in userspace. */
 163     /* minus 8 is offset to cater for "rtsd r15,8" offset */
 164     if (ka->sa_flags & TARGET_SA_RESTORER) {
 165         env->regs[15] = ((unsigned long)ka->sa_restorer)-8;
 166     } else {
 167         uint32_t t;
 168         /* Note, these encodings are _big endian_! */
 169         /* addi r12, r0, __NR_sigreturn */
 170         t = 0x31800000UL | TARGET_NR_sigreturn;
 171         __put_user(t, frame->tramp + 0);
 172         /* brki r14, 0x8 */
 173         t = 0xb9cc0008UL;
 174         __put_user(t, frame->tramp + 1);
 175
 176         /* Return from sighandler will jump to the tramp.
 177            Negative 8 offset because return is rtsd r15, 8 */
 178         env->regs[15] = frame_addr + offsetof(struct target_signal_frame, tramp)
 179                                    - 8;
 180     }
 181
 182     /* Set up registers for signal handler */
 183     env->regs[1] = frame_addr;
 184     /* Signal handler args: */
 185     env->regs[5] = sig; /* Arg 0: signum */
 186     env->regs[6] = 0;
 187     /* arg 1: sigcontext */
 188     env->regs[7] = frame_addr += offsetof(typeof(*frame), uc);
 189
 190     /* Offset of 4 to handle microblaze rtid r14, 0 */
 191     env->sregs[SR_PC] = (unsigned long)ka->_sa_handler;
 192
 193     unlock_user_struct(frame, frame_addr, 1);
 194     return;
 195 badframe:
 196     force_sigsegv(sig);
 197 }
 198
 199 void setup_rt_frame(int sig, struct target_sigaction *ka,
 200                     target_siginfo_t *info,
 201                     target_sigset_t *set, CPUMBState *env)
 202 {
 203     qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n");
 204 }
 205
 206 long do_sigreturn(CPUMBState *env)
 207 {
 208     struct target_signal_frame *frame;
 209     abi_ulong frame_addr;
 210     target_sigset_t target_set;
 211     sigset_t set;
 212     int i;
 213
 214     frame_addr = env->regs[R_SP];
 215     trace_user_do_sigreturn(env, frame_addr);
 216     /* Make sure the guest isn't playing games.  */
 217     if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1))
 218         goto badframe;
 219
 220     /* Restore blocked signals */
 221     __get_user(target_set.sig[0], &frame->uc.tuc_mcontext.oldmask);
 222     for(i = 1; i < TARGET_NSIG_WORDS; i++) {
 223         __get_user(target_set.sig[i], &frame->extramask[i - 1]);
 224     }
 225     target_to_host_sigset_internal(&set, &target_set);
 226     set_sigmask(&set);
 227
 228     restore_sigcontext(&frame->uc.tuc_mcontext, env);
 229     /* We got here through a sigreturn syscall, our path back is via an
 230        rtb insn so setup r14 for that.  */
 231     env->regs[14] = env->sregs[SR_PC];
 232
 233     unlock_user_struct(frame, frame_addr, 0);
 234     return -TARGET_QEMU_ESIGRETURN;
 235 badframe:
 236     force_sig(TARGET_SIGSEGV);
 237     return -TARGET_QEMU_ESIGRETURN;
 238 }
 239
 240 long do_rt_sigreturn(CPUMBState *env)
 241 {
 242     trace_user_do_rt_sigreturn(env, 0);
 243     qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n");
 244     return -TARGET_ENOSYS;
 245 }