diff options
Diffstat (limited to 'linux-user/cris/signal.c')
| -rw-r--r-- | linux-user/cris/signal.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/linux-user/cris/signal.c b/linux-user/cris/signal.c new file mode 100644 index 000000000..7f6aca934 --- /dev/null +++ b/linux-user/cris/signal.c @@ -0,0 +1,202 @@ +/* + * Emulation of Linux signals + * + * Copyright (c) 2003 Fabrice Bellard + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ +#include "qemu/osdep.h" +#include "qemu.h" +#include "user-internals.h" +#include "signal-common.h" +#include "linux-user/trace.h" + +struct target_sigcontext { + struct target_pt_regs regs; /* needs to be first */ + uint32_t oldmask; + uint32_t usp; /* usp before stacking this gunk on it */ +}; + +/* Signal frames. */ +struct target_signal_frame { + struct target_sigcontext sc; + uint32_t extramask[TARGET_NSIG_WORDS - 1]; + uint16_t retcode[4]; /* Trampoline code. */ +}; + +struct rt_signal_frame { + siginfo_t *pinfo; + void *puc; + siginfo_t info; + ucontext_t uc; + uint16_t retcode[4]; /* Trampoline code. */ +}; + +static void setup_sigcontext(struct target_sigcontext *sc, CPUCRISState *env) +{ + __put_user(env->regs[0], &sc->regs.r0); + __put_user(env->regs[1], &sc->regs.r1); + __put_user(env->regs[2], &sc->regs.r2); + __put_user(env->regs[3], &sc->regs.r3); + __put_user(env->regs[4], &sc->regs.r4); + __put_user(env->regs[5], &sc->regs.r5); + __put_user(env->regs[6], &sc->regs.r6); + __put_user(env->regs[7], &sc->regs.r7); + __put_user(env->regs[8], &sc->regs.r8); + __put_user(env->regs[9], &sc->regs.r9); + __put_user(env->regs[10], &sc->regs.r10); + __put_user(env->regs[11], &sc->regs.r11); + __put_user(env->regs[12], &sc->regs.r12); + __put_user(env->regs[13], &sc->regs.r13); + __put_user(env->regs[14], &sc->usp); + __put_user(env->regs[15], &sc->regs.acr); + __put_user(env->pregs[PR_MOF], &sc->regs.mof); + __put_user(env->pregs[PR_SRP], &sc->regs.srp); + __put_user(env->pc, &sc->regs.erp); +} + +static void restore_sigcontext(struct target_sigcontext *sc, CPUCRISState *env) +{ + __get_user(env->regs[0], &sc->regs.r0); + __get_user(env->regs[1], &sc->regs.r1); + __get_user(env->regs[2], &sc->regs.r2); + __get_user(env->regs[3], &sc->regs.r3); + __get_user(env->regs[4], &sc->regs.r4); + __get_user(env->regs[5], &sc->regs.r5); + __get_user(env->regs[6], &sc->regs.r6); + __get_user(env->regs[7], &sc->regs.r7); + __get_user(env->regs[8], &sc->regs.r8); + __get_user(env->regs[9], &sc->regs.r9); + __get_user(env->regs[10], &sc->regs.r10); + __get_user(env->regs[11], &sc->regs.r11); + __get_user(env->regs[12], &sc->regs.r12); + __get_user(env->regs[13], &sc->regs.r13); + __get_user(env->regs[14], &sc->usp); + __get_user(env->regs[15], &sc->regs.acr); + __get_user(env->pregs[PR_MOF], &sc->regs.mof); + __get_user(env->pregs[PR_SRP], &sc->regs.srp); + __get_user(env->pc, &sc->regs.erp); +} + +static abi_ulong get_sigframe(CPUCRISState *env, int framesize) +{ + abi_ulong sp; + /* Align the stack downwards to 4. */ + sp = (env->regs[R_SP] & ~3); + return sp - framesize; +} + +static void setup_sigreturn(uint16_t *retcode) +{ + /* This is movu.w __NR_sigreturn, r9; break 13; */ + __put_user(0x9c5f, retcode + 0); + __put_user(TARGET_NR_sigreturn, retcode + 1); + __put_user(0xe93d, retcode + 2); +} + +void setup_frame(int sig, struct target_sigaction *ka, + target_sigset_t *set, CPUCRISState *env) +{ + struct target_signal_frame *frame; + abi_ulong frame_addr; + int i; + + frame_addr = get_sigframe(env, sizeof *frame); + trace_user_setup_frame(env, frame_addr); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) + goto badframe; + + /* + * The CRIS signal return trampoline. A real linux/CRIS kernel doesn't + * use this trampoline anymore but it sets it up for GDB. + */ + setup_sigreturn(frame->retcode); + + /* Save the mask. */ + __put_user(set->sig[0], &frame->sc.oldmask); + + for(i = 1; i < TARGET_NSIG_WORDS; i++) { + __put_user(set->sig[i], &frame->extramask[i - 1]); + } + + setup_sigcontext(&frame->sc, env); + + /* Move the stack and setup the arguments for the handler. */ + env->regs[R_SP] = frame_addr; + env->regs[10] = sig; + env->pc = (unsigned long) ka->_sa_handler; + /* Link SRP so the guest returns through the trampoline. */ + env->pregs[PR_SRP] = default_sigreturn; + + unlock_user_struct(frame, frame_addr, 1); + return; +badframe: + force_sigsegv(sig); +} + +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUCRISState *env) +{ + qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n"); +} + +long do_sigreturn(CPUCRISState *env) +{ + struct target_signal_frame *frame; + abi_ulong frame_addr; + target_sigset_t target_set; + sigset_t set; + int i; + + frame_addr = env->regs[R_SP]; + trace_user_do_sigreturn(env, frame_addr); + /* Make sure the guest isn't playing games. */ + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) { + goto badframe; + } + + /* Restore blocked signals */ + __get_user(target_set.sig[0], &frame->sc.oldmask); + for(i = 1; i < TARGET_NSIG_WORDS; i++) { + __get_user(target_set.sig[i], &frame->extramask[i - 1]); + } + target_to_host_sigset_internal(&set, &target_set); + set_sigmask(&set); + + restore_sigcontext(&frame->sc, env); + unlock_user_struct(frame, frame_addr, 0); + return -TARGET_QEMU_ESIGRETURN; +badframe: + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; +} + +long do_rt_sigreturn(CPUCRISState *env) +{ + trace_user_do_rt_sigreturn(env, 0); + qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n"); + return -TARGET_ENOSYS; +} + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6, 0); + assert(tramp != NULL); + + default_sigreturn = sigtramp_page; + setup_sigreturn(tramp); + + unlock_user(tramp, sigtramp_page, 6); +} |