diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 239 |
1 files changed, 237 insertions, 2 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 0a5bb4e26b..5064de0c08 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -254,7 +254,7 @@ int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset) } #if !defined(TARGET_OPENRISC) && !defined(TARGET_UNICORE32) && \ - !defined(TARGET_X86_64) + !defined(TARGET_X86_64) && !defined(TARGET_NIOS2) /* Just set the guest's signal mask to the specified value; the * caller is assumed to have called block_signals() already. */ @@ -3922,6 +3922,240 @@ long do_rt_sigreturn(CPUCRISState *env) return -TARGET_ENOSYS; } +#elif defined(TARGET_NIOS2) + +#define MCONTEXT_VERSION 2 + +struct target_sigcontext { + int version; + unsigned long gregs[32]; +}; + +struct target_ucontext { + abi_ulong tuc_flags; + abi_ulong tuc_link; + target_stack_t tuc_stack; + struct target_sigcontext tuc_mcontext; + target_sigset_t tuc_sigmask; /* mask last for extensibility */ +}; + +struct target_rt_sigframe { + struct target_siginfo info; + struct target_ucontext uc; +}; + +static unsigned long sigsp(unsigned long sp, struct target_sigaction *ka) +{ + if (unlikely((ka->sa_flags & SA_ONSTACK)) && !sas_ss_flags(sp)) { +#ifdef CONFIG_STACK_GROWSUP + return target_sigaltstack_used.ss_sp; +#else + return target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; +#endif + } + return sp; +} + +static int rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *env) +{ + unsigned long *gregs = uc->tuc_mcontext.gregs; + + __put_user(MCONTEXT_VERSION, &uc->tuc_mcontext.version); + __put_user(env->regs[1], &gregs[0]); + __put_user(env->regs[2], &gregs[1]); + __put_user(env->regs[3], &gregs[2]); + __put_user(env->regs[4], &gregs[3]); + __put_user(env->regs[5], &gregs[4]); + __put_user(env->regs[6], &gregs[5]); + __put_user(env->regs[7], &gregs[6]); + __put_user(env->regs[8], &gregs[7]); + __put_user(env->regs[9], &gregs[8]); + __put_user(env->regs[10], &gregs[9]); + __put_user(env->regs[11], &gregs[10]); + __put_user(env->regs[12], &gregs[11]); + __put_user(env->regs[13], &gregs[12]); + __put_user(env->regs[14], &gregs[13]); + __put_user(env->regs[15], &gregs[14]); + __put_user(env->regs[16], &gregs[15]); + __put_user(env->regs[17], &gregs[16]); + __put_user(env->regs[18], &gregs[17]); + __put_user(env->regs[19], &gregs[18]); + __put_user(env->regs[20], &gregs[19]); + __put_user(env->regs[21], &gregs[20]); + __put_user(env->regs[22], &gregs[21]); + __put_user(env->regs[23], &gregs[22]); + __put_user(env->regs[R_RA], &gregs[23]); + __put_user(env->regs[R_FP], &gregs[24]); + __put_user(env->regs[R_GP], &gregs[25]); + __put_user(env->regs[R_EA], &gregs[27]); + __put_user(env->regs[R_SP], &gregs[28]); + + return 0; +} + +static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc, + int *pr2) +{ + int temp; + abi_ulong off, frame_addr = env->regs[R_SP]; + unsigned long *gregs = uc->tuc_mcontext.gregs; + int err; + + /* Always make any pending restarted system calls return -EINTR */ + /* current->restart_block.fn = do_no_restart_syscall; */ + + __get_user(temp, &uc->tuc_mcontext.version); + if (temp != MCONTEXT_VERSION) { + return 1; + } + + /* restore passed registers */ + __get_user(env->regs[1], &gregs[0]); + __get_user(env->regs[2], &gregs[1]); + __get_user(env->regs[3], &gregs[2]); + __get_user(env->regs[4], &gregs[3]); + __get_user(env->regs[5], &gregs[4]); + __get_user(env->regs[6], &gregs[5]); + __get_user(env->regs[7], &gregs[6]); + __get_user(env->regs[8], &gregs[7]); + __get_user(env->regs[9], &gregs[8]); + __get_user(env->regs[10], &gregs[9]); + __get_user(env->regs[11], &gregs[10]); + __get_user(env->regs[12], &gregs[11]); + __get_user(env->regs[13], &gregs[12]); + __get_user(env->regs[14], &gregs[13]); + __get_user(env->regs[15], &gregs[14]); + __get_user(env->regs[16], &gregs[15]); + __get_user(env->regs[17], &gregs[16]); + __get_user(env->regs[18], &gregs[17]); + __get_user(env->regs[19], &gregs[18]); + __get_user(env->regs[20], &gregs[19]); + __get_user(env->regs[21], &gregs[20]); + __get_user(env->regs[22], &gregs[21]); + __get_user(env->regs[23], &gregs[22]); + /* gregs[23] is handled below */ + /* Verify, should this be settable */ + __get_user(env->regs[R_FP], &gregs[24]); + /* Verify, should this be settable */ + __get_user(env->regs[R_GP], &gregs[25]); + /* Not really necessary no user settable bits */ + __get_user(temp, &gregs[26]); + __get_user(env->regs[R_EA], &gregs[27]); + + __get_user(env->regs[R_RA], &gregs[23]); + __get_user(env->regs[R_SP], &gregs[28]); + + off = offsetof(struct target_rt_sigframe, uc.tuc_stack); + err = do_sigaltstack(frame_addr + off, 0, get_sp_from_cpustate(env)); + if (err == -EFAULT) { + return 1; + } + + *pr2 = env->regs[2]; + return 0; +} + +static void *get_sigframe(struct target_sigaction *ka, CPUNios2State *env, + size_t frame_size) +{ + unsigned long usp; + + /* Default to using normal stack. */ + usp = env->regs[R_SP]; + + /* This is the X/Open sanctioned signal stack switching. */ + usp = sigsp(usp, ka); + + /* Verify, is it 32 or 64 bit aligned */ + return (void *)((usp - frame_size) & -8UL); +} + +static void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, + CPUNios2State *env) +{ + struct target_rt_sigframe *frame; + int i, err = 0; + + frame = get_sigframe(ka, env, sizeof(*frame)); + + if (ka->sa_flags & SA_SIGINFO) { + tswap_siginfo(&frame->info, info); + } + + /* Create the ucontext. */ + __put_user(0, &frame->uc.tuc_flags); + __put_user(0, &frame->uc.tuc_link); + __put_user(target_sigaltstack_used.ss_sp, &frame->uc.tuc_stack.ss_sp); + __put_user(sas_ss_flags(env->regs[R_SP]), &frame->uc.tuc_stack.ss_flags); + __put_user(target_sigaltstack_used.ss_size, &frame->uc.tuc_stack.ss_size); + err |= rt_setup_ucontext(&frame->uc, env); + for (i = 0; i < TARGET_NSIG_WORDS; i++) { + __put_user((abi_ulong)set->sig[i], + (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]); + } + + if (err) { + goto give_sigsegv; + } + + /* Set up to return from userspace; jump to fixed address sigreturn + trampoline on kuser page. */ + env->regs[R_RA] = (unsigned long) (0x1044); + + /* Set up registers for signal handler */ + env->regs[R_SP] = (unsigned long) frame; + env->regs[4] = (unsigned long) sig; + env->regs[5] = (unsigned long) &frame->info; + env->regs[6] = (unsigned long) &frame->uc; + env->regs[R_EA] = (unsigned long) ka->_sa_handler; + return; + +give_sigsegv: + if (sig == TARGET_SIGSEGV) { + ka->_sa_handler = TARGET_SIG_DFL; + } + force_sigsegv(sig); + return; +} + +long do_sigreturn(CPUNios2State *env) +{ + trace_user_do_sigreturn(env, 0); + fprintf(stderr, "do_sigreturn: not implemented\n"); + return -TARGET_ENOSYS; +} + +long do_rt_sigreturn(CPUNios2State *env) +{ + /* Verify, can we follow the stack back */ + abi_ulong frame_addr = env->regs[R_SP]; + struct target_rt_sigframe *frame; + sigset_t set; + int rval; + + if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { + goto badframe; + } + + target_to_host_sigset(&set, &frame->uc.tuc_sigmask); + do_sigprocmask(SIG_SETMASK, &set, NULL); + + if (rt_restore_ucontext(env, &frame->uc, &rval)) { + goto badframe; + } + + unlock_user_struct(frame, frame_addr, 0); + return rval; + +badframe: + unlock_user_struct(frame, frame_addr, 0); + force_sig(TARGET_SIGSEGV); + return 0; +} +/* TARGET_NIOS2 */ + #elif defined(TARGET_OPENRISC) struct target_sigcontext { @@ -6178,7 +6412,8 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig, /* prepare the stack frame of the virtual CPU */ #if defined(TARGET_ABI_MIPSN32) || defined(TARGET_ABI_MIPSN64) \ || defined(TARGET_OPENRISC) || defined(TARGET_TILEGX) \ - || defined(TARGET_PPC64) || defined(TARGET_HPPA) + || defined(TARGET_PPC64) || defined(TARGET_HPPA) \ + || defined(TARGET_NIOS2) /* These targets do not have traditional signals. */ setup_rt_frame(sig, sa, &k->info, &target_old_set, cpu_env); #else |