diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index 43346dcbcc..97f30d9547 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -3629,6 +3629,235 @@ long do_rt_sigreturn(CPUCRISState *env) return -TARGET_ENOSYS; } +#elif defined(TARGET_OPENRISC) + +struct target_sigcontext { + struct target_pt_regs regs; + abi_ulong oldmask; + abi_ulong usp; +}; + +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 { + abi_ulong pinfo; + uint64_t puc; + struct target_siginfo info; + struct target_sigcontext sc; + struct target_ucontext uc; + unsigned char retcode[16]; /* trampoline code */ +}; + +/* This is the asm-generic/ucontext.h version */ +#if 0 +static int restore_sigcontext(CPUOpenRISCState *regs, + struct target_sigcontext *sc) +{ + unsigned int err = 0; + unsigned long old_usp; + + /* Alwys make any pending restarted system call return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + /* restore the regs from &sc->regs (same as sc, since regs is first) + * (sc is already checked for VERIFY_READ since the sigframe was + * checked in sys_sigreturn previously) + */ + + if (copy_from_user(regs, &sc, sizeof(struct target_pt_regs))) { + goto badframe; + } + + /* make sure the U-flag is set so user-mode cannot fool us */ + + regs->sr &= ~SR_SM; + + /* restore the old USP as it was before we stacked the sc etc. + * (we cannot just pop the sigcontext since we aligned the sp and + * stuff after pushing it) + */ + + err |= __get_user(old_usp, &sc->usp); + phx_signal("old_usp 0x%lx", old_usp); + + __PHX__ REALLY /* ??? */ + wrusp(old_usp); + regs->gpr[1] = old_usp; + + /* TODO: the other ports use regs->orig_XX to disable syscall checks + * after this completes, but we don't use that mechanism. maybe we can + * use it now ? + */ + + return err; + +badframe: + return 1; +} +#endif + +/* Set up a signal frame. */ + +static int setup_sigcontext(struct target_sigcontext *sc, + CPUOpenRISCState *regs, + unsigned long mask) +{ + int err = 0; + unsigned long usp = regs->gpr[1]; + + /* copy the regs. they are first in sc so we can use sc directly */ + + /*err |= copy_to_user(&sc, regs, sizeof(struct target_pt_regs));*/ + + /* Set the frametype to CRIS_FRAME_NORMAL for the execution of + the signal handler. The frametype will be restored to its previous + value in restore_sigcontext. */ + /*regs->frametype = CRIS_FRAME_NORMAL;*/ + + /* then some other stuff */ + err |= __put_user(mask, &sc->oldmask); + err |= __put_user(usp, &sc->usp); return err; +} + +static inline unsigned long align_sigframe(unsigned long sp) +{ + unsigned long i; + i = sp & ~3UL; + return i; +} + +static inline abi_ulong get_sigframe(struct target_sigaction *ka, + CPUOpenRISCState *regs, + size_t frame_size) +{ + unsigned long sp = regs->gpr[1]; + int onsigstack = on_sig_stack(sp); + + /* redzone */ + /* This is the X/Open sanctioned signal stack switching. */ + if ((ka->sa_flags & SA_ONSTACK) != 0 && !onsigstack) { + sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; + } + + sp = align_sigframe(sp - frame_size); + + /* + * If we are on the alternate signal stack and would overflow it, don't. + * Return an always-bogus address instead so we will die with SIGSEGV. + */ + + if (onsigstack && !likely(on_sig_stack(sp))) { + return -1L; + } + + return sp; +} + +static void setup_frame(int sig, struct target_sigaction *ka, + target_sigset_t *set, CPUOpenRISCState *env) +{ + qemu_log("Not implement.\n"); +} + +static void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUOpenRISCState *env) +{ + int err = 0; + abi_ulong frame_addr; + unsigned long return_ip; + struct target_rt_sigframe *frame; + abi_ulong info_addr, uc_addr; + + frame_addr = get_sigframe(ka, env, sizeof *frame); + + frame_addr = get_sigframe(ka, env, sizeof(*frame)); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + goto give_sigsegv; + } + + info_addr = frame_addr + offsetof(struct target_rt_sigframe, info); + err |= __put_user(info_addr, &frame->pinfo); + uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc); + err |= __put_user(uc_addr, &frame->puc); + + if (ka->sa_flags & SA_SIGINFO) { + err |= copy_siginfo_to_user(&frame->info, info); + } + if (err) { + goto give_sigsegv; + } + + /*err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));*/ + err |= __put_user(0, &frame->uc.tuc_flags); + err |= __put_user(0, &frame->uc.tuc_link); + err |= __put_user(target_sigaltstack_used.ss_sp, + &frame->uc.tuc_stack.ss_sp); + err |= __put_user(sas_ss_flags(env->gpr[1]), &frame->uc.tuc_stack.ss_flags); + err |= __put_user(target_sigaltstack_used.ss_size, + &frame->uc.tuc_stack.ss_size); + err |= setup_sigcontext(&frame->sc, env, set->sig[0]); + + /*err |= copy_to_user(frame->uc.tuc_sigmask, set, sizeof(*set));*/ + + if (err) { + goto give_sigsegv; + } + + /* trampoline - the desired return ip is the retcode itself */ + return_ip = (unsigned long)&frame->retcode; + /* This is l.ori r11,r0,__NR_sigreturn, l.sys 1 */ + err |= __put_user(0xa960, (short *)(frame->retcode + 0)); + err |= __put_user(TARGET_NR_rt_sigreturn, (short *)(frame->retcode + 2)); + err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4)); + err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8)); + + if (err) { + goto give_sigsegv; + } + + /* TODO what is the current->exec_domain stuff and invmap ? */ + + /* Set up registers for signal handler */ + env->pc = (unsigned long)ka->_sa_handler; /* what we enter NOW */ + env->gpr[9] = (unsigned long)return_ip; /* what we enter LATER */ + env->gpr[3] = (unsigned long)sig; /* arg 1: signo */ + env->gpr[4] = (unsigned long)&frame->info; /* arg 2: (siginfo_t*) */ + env->gpr[5] = (unsigned long)&frame->uc; /* arg 3: ucontext */ + + /* actually move the usp to reflect the stacked frame */ + env->gpr[1] = (unsigned long)frame; + + return; + +give_sigsegv: + unlock_user_struct(frame, frame_addr, 1); + if (sig == TARGET_SIGSEGV) { + ka->_sa_handler = TARGET_SIG_DFL; + } + force_sig(TARGET_SIGSEGV); +} + +long do_sigreturn(CPUOpenRISCState *env) +{ + + qemu_log("do_sigreturn: not implemented\n"); + return -TARGET_ENOSYS; +} + +long do_rt_sigreturn(CPUOpenRISCState *env) +{ + qemu_log("do_rt_sigreturn: not implemented\n"); + return -TARGET_ENOSYS; +} +/* TARGET_OPENRISC */ + #elif defined(TARGET_S390X) #define __NUM_GPRS 16 |