diff options
Diffstat (limited to 'arch/sparc/kernel/signal.c')
| -rw-r--r-- | arch/sparc/kernel/signal.c | 1181 |
1 files changed, 1181 insertions, 0 deletions
diff --git a/arch/sparc/kernel/signal.c b/arch/sparc/kernel/signal.c new file mode 100644 index 0000000..011ff35 --- /dev/null +++ b/arch/sparc/kernel/signal.c @@ -0,0 +1,1181 @@ +/* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $ + * linux/arch/sparc/kernel/signal.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) + * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) + */ + +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/mm.h> +#include <linux/tty.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/binfmts.h> /* do_coredum */ +#include <linux/bitops.h> + +#include <asm/uaccess.h> +#include <asm/ptrace.h> +#include <asm/svr4.h> +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/cacheflush.h> /* flush_sig_insns */ + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +extern void fpsave(unsigned long *fpregs, unsigned long *fsr, + void *fpqueue, unsigned long *fpqdepth); +extern void fpload(unsigned long *fpregs, unsigned long *fsr); + +asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, + unsigned long orig_o0, int restart_syscall); + +/* Signal frames: the original one (compatible with SunOS): + * + * Set up a signal frame... Make the stack look the way SunOS + * expects it to look which is basically: + * + * ---------------------------------- <-- %sp at signal time + * Struct sigcontext + * Signal address + * Ptr to sigcontext area above + * Signal code + * The signal number itself + * One register window + * ---------------------------------- <-- New %sp + */ +struct signal_sframe { + struct reg_window sig_window; + int sig_num; + int sig_code; + struct sigcontext __user *sig_scptr; + int sig_address; + struct sigcontext sig_context; + unsigned int extramask[_NSIG_WORDS - 1]; +}; + +/* + * And the new one, intended to be used for Linux applications only + * (we have enough in there to work with clone). + * All the interesting bits are in the info field. + */ + +struct new_signal_frame { + struct sparc_stackf ss; + __siginfo_t info; + __siginfo_fpu_t __user *fpu_save; + unsigned long insns[2] __attribute__ ((aligned (8))); + unsigned int extramask[_NSIG_WORDS - 1]; + unsigned int extra_size; /* Should be 0 */ + __siginfo_fpu_t fpu_state; +}; + +struct rt_signal_frame { + struct sparc_stackf ss; + siginfo_t info; + struct pt_regs regs; + sigset_t mask; + __siginfo_fpu_t __user *fpu_save; + unsigned int insns[2]; + stack_t stack; + unsigned int extra_size; /* Should be 0 */ + __siginfo_fpu_t fpu_state; +}; + +/* Align macros */ +#define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) +#define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7))) +#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) + +/* + * atomically swap in the new signal mask, and wait for a signal. + * This is really tricky on the Sparc, watch out... + */ +asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs) +{ + sigset_t saveset; + + set &= _BLOCKABLE; + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + siginitset(¤t->blocked, set); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs->pc = regs->npc; + regs->npc += 4; + + /* Condition codes and return value where set here for sigpause, + * and so got used by setup_frame, which again causes sigreturn() + * to return -EINTR. + */ + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + /* + * Return -EINTR and set condition code here, + * so the interrupted system call actually returns + * these. + */ + regs->psr |= PSR_C; + regs->u_regs[UREG_I0] = EINTR; + if (do_signal(&saveset, regs, 0, 0)) + return; + } +} + +asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) +{ + _sigpause_common(set, regs); +} + +asmlinkage void do_sigsuspend (struct pt_regs *regs) +{ + _sigpause_common(regs->u_regs[UREG_I0], regs); +} + +asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, + struct pt_regs *regs) +{ + sigset_t oldset, set; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(sigset_t)) { + regs->psr |= PSR_C; + regs->u_regs[UREG_I0] = EINVAL; + return; + } + + if (copy_from_user(&set, uset, sizeof(set))) { + regs->psr |= PSR_C; + regs->u_regs[UREG_I0] = EFAULT; + return; + } + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + oldset = current->blocked; + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs->pc = regs->npc; + regs->npc += 4; + + /* Condition codes and return value where set here for sigpause, + * and so got used by setup_frame, which again causes sigreturn() + * to return -EINTR. + */ + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + /* + * Return -EINTR and set condition code here, + * so the interrupted system call actually returns + * these. + */ + regs->psr |= PSR_C; + regs->u_regs[UREG_I0] = EINTR; + if (do_signal(&oldset, regs, 0, 0)) + return; + } +} + +static inline int +restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) +{ + int err; +#ifdef CONFIG_SMP + if (test_tsk_thread_flag(current, TIF_USEDFPU)) + regs->psr &= ~PSR_EF; +#else + if (current == last_task_used_math) { + last_task_used_math = NULL; + regs->psr &= ~PSR_EF; + } +#endif + set_used_math(); + clear_tsk_thread_flag(current, TIF_USEDFPU); + + if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) + return -EFAULT; + + err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], + (sizeof(unsigned long) * 32)); + err |= __get_user(current->thread.fsr, &fpu->si_fsr); + err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); + if (current->thread.fpqdepth != 0) + err |= __copy_from_user(¤t->thread.fpqueue[0], + &fpu->si_fpqueue[0], + ((sizeof(unsigned long) + + (sizeof(unsigned long *)))*16)); + return err; +} + +static inline void do_new_sigreturn (struct pt_regs *regs) +{ + struct new_signal_frame __user *sf; + unsigned long up_psr, pc, npc; + sigset_t set; + __siginfo_fpu_t __user *fpu_save; + int err; + + sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP]; + + /* 1. Make sure we are not getting garbage from the user */ + if (!access_ok(VERIFY_READ, sf, sizeof(*sf))) + goto segv_and_exit; + + if (((unsigned long) sf) & 3) + goto segv_and_exit; + + err = __get_user(pc, &sf->info.si_regs.pc); + err |= __get_user(npc, &sf->info.si_regs.npc); + + if ((pc | npc) & 3) + goto segv_and_exit; + + /* 2. Restore the state */ + up_psr = regs->psr; + err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs)); + + /* User can only change condition codes and FPU enabling in %psr. */ + regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) + | (regs->psr & (PSR_ICC | PSR_EF)); + + err |= __get_user(fpu_save, &sf->fpu_save); + + if (fpu_save) + err |= restore_fpu_state(regs, fpu_save); + + /* This is pretty much atomic, no amount locking would prevent + * the races which exist anyways. + */ + err |= __get_user(set.sig[0], &sf->info.si_mask); + err |= __copy_from_user(&set.sig[1], &sf->extramask, + (_NSIG_WORDS-1) * sizeof(unsigned int)); + + if (err) + goto segv_and_exit; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + return; + +segv_and_exit: + force_sig(SIGSEGV, current); +} + +asmlinkage void do_sigreturn(struct pt_regs *regs) +{ + struct sigcontext __user *scptr; + unsigned long pc, npc, psr; + sigset_t set; + int err; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + synchronize_user_stack(); + + if (current->thread.new_signal) { + do_new_sigreturn(regs); + return; + } + + scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0]; + + /* Check sanity of the user arg. */ + if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) || + (((unsigned long) scptr) & 3)) + goto segv_and_exit; + + err = __get_user(pc, &scptr->sigc_pc); + err |= __get_user(npc, &scptr->sigc_npc); + + if ((pc | npc) & 3) + goto segv_and_exit; + + /* This is pretty much atomic, no amount locking would prevent + * the races which exist anyways. + */ + err |= __get_user(set.sig[0], &scptr->sigc_mask); + /* Note that scptr + 1 points to extramask */ + err |= __copy_from_user(&set.sig[1], scptr + 1, + (_NSIG_WORDS - 1) * sizeof(unsigned int)); + + if (err) + goto segv_and_exit; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs->pc = pc; + regs->npc = npc; + + err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); + err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); + err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); + + /* User can only change condition codes in %psr. */ + err |= __get_user(psr, &scptr->sigc_psr); + if (err) + goto segv_and_exit; + + regs->psr &= ~(PSR_ICC); + regs->psr |= (psr & PSR_ICC); + return; + +segv_and_exit: + force_sig(SIGSEGV, current); +} + +asmlinkage void do_rt_sigreturn(struct pt_regs *regs) +{ + struct rt_signal_frame __user *sf; + unsigned int psr, pc, npc; + __siginfo_fpu_t __user *fpu_save; + mm_segment_t old_fs; + sigset_t set; + stack_t st; + int err; + + synchronize_user_stack(); + sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; + if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || + (((unsigned long) sf) & 0x03)) + goto segv; + + err = __get_user(pc, &sf->regs.pc); + err |= __get_user(npc, &sf->regs.npc); + err |= ((pc | npc) & 0x03); + + err |= __get_user(regs->y, &sf->regs.y); + err |= __get_user(psr, &sf->regs.psr); + + err |= __copy_from_user(®s->u_regs[UREG_G1], + &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32)); + + regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); + + err |= __get_user(fpu_save, &sf->fpu_save); + + if (fpu_save) + err |= restore_fpu_state(regs, fpu_save); + err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); + + err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); + + if (err) + goto segv; + + regs->pc = pc; + regs->npc = npc; + + /* It is more difficult to avoid calling this function than to + * call it and ignore errors. + */ + old_fs = get_fs(); + set_fs(KERNEL_DS); + do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); + set_fs(old_fs); + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + return; +segv: + force_sig(SIGSEGV, current); +} + +/* Checks if the fp is valid */ +static inline int invalid_frame_pointer(void __user *fp, int fplen) +{ + if ((((unsigned long) fp) & 7) || + !__access_ok((unsigned long)fp, fplen) || + ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && + ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) + return 1; + + return 0; +} + +static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) +{ + unsigned long sp; + + sp = regs->u_regs[UREG_FP]; + + /* This is the X/Open sanctioned signal stack switching. */ + if (sa->sa_flags & SA_ONSTACK) { + if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) + sp = current->sas_ss_sp + current->sas_ss_size; + } + return (void __user *)(sp - framesize); +} + +static inline void +setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) +{ + struct signal_sframe __user *sframep; + struct sigcontext __user *sc; + int window = 0, err; + unsigned long pc = regs->pc; + unsigned long npc = regs->npc; + struct thread_info *tp = current_thread_info(); + void __user *sig_address; + int sig_code; + + synchronize_user_stack(); + sframep = (struct signal_sframe __user *) + get_sigframe(sa, regs, SF_ALIGNEDSZ); + if (invalid_frame_pointer(sframep, sizeof(*sframep))){ + /* Don't change signal code and address, so that + * post mortem debuggers can have a look. + */ + goto sigill_and_return; + } + + sc = &sframep->sig_context; + + /* We've already made sure frame pointer isn't in kernel space... */ + err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), + &sc->sigc_onstack); + err |= __put_user(oldset->sig[0], &sc->sigc_mask); + err |= __copy_to_user(sframep->extramask, &oldset->sig[1], + (_NSIG_WORDS - 1) * sizeof(unsigned int)); + err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); + err |= __put_user(pc, &sc->sigc_pc); + err |= __put_user(npc, &sc->sigc_npc); + err |= __put_user(regs->psr, &sc->sigc_psr); + err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); + err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); + err |= __put_user(tp->w_saved, &sc->sigc_oswins); + if (tp->w_saved) + for (window = 0; window < tp->w_saved; window++) { + put_user((char *)tp->rwbuf_stkptrs[window], + &sc->sigc_spbuf[window]); + err |= __copy_to_user(&sc->sigc_wbuf[window], + &tp->reg_window[window], + sizeof(struct reg_window)); + } + else + err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP], + sizeof(struct reg_window)); + + tp->w_saved = 0; /* So process is allowed to execute. */ + + err |= __put_user(signr, &sframep->sig_num); + sig_address = NULL; + sig_code = 0; + if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { + sig_address = info->si_addr; + switch (signr) { + case SIGSEGV: + switch (info->si_code) { + case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; + default: sig_code = SUBSIG_PROTECTION; break; + } + break; + case SIGILL: + switch (info->si_code) { + case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; + case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; + case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break; + default: sig_code = SUBSIG_STACK; break; + } + break; + case SIGFPE: + switch (info->si_code) { + case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; + case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; + case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; + case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; + case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; + case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; + case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; + default: sig_code = SUBSIG_FPERROR; break; + } + break; + case SIGBUS: + switch (info->si_code) { + case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; + case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; + default: sig_code = SUBSIG_BUSTIMEOUT; break; + } + break; + case SIGEMT: + switch (info->si_code) { + case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; + } + break; + case SIGSYS: + if (info->si_code == (__SI_FAULT|0x100)) { + /* See sys_sunos.c */ + sig_code = info->si_trapno; + break; + } + default: + sig_address = NULL; + } + } + err |= __put_user((unsigned long)sig_address, &sframep->sig_address); + err |= __put_user(sig_code, &sframep->sig_code); + err |= __put_user(sc, &sframep->sig_scptr); + if (err) + goto sigsegv; + + regs->u_regs[UREG_FP] = (unsigned long) sframep; + regs->pc = (unsigned long) sa->sa_handler; + regs->npc = (regs->pc + 4); + return; + +sigill_and_return: + do_exit(SIGILL); +sigsegv: + force_sigsegv(signr, current); +} + + +static inline int +save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) +{ + int err = 0; +#ifdef CONFIG_SMP + if (test_tsk_thread_flag(current, TIF_USEDFPU)) { + put_psr(get_psr() | PSR_EF); + fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, + ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); + regs->psr &= ~(PSR_EF); + clear_tsk_thread_flag(current, TIF_USEDFPU); + } +#else + if (current == last_task_used_math) { + put_psr(get_psr() | PSR_EF); + fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, + ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); + last_task_used_math = NULL; + regs->psr &= ~(PSR_EF); + } +#endif + err |= __copy_to_user(&fpu->si_float_regs[0], + ¤t->thread.float_regs[0], + (sizeof(unsigned long) * 32)); + err |= __put_user(current->thread.fsr, &fpu->si_fsr); + err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); + if (current->thread.fpqdepth != 0) + err |= __copy_to_user(&fpu->si_fpqueue[0], + ¤t->thread.fpqueue[0], + ((sizeof(unsigned long) + + (sizeof(unsigned long *)))*16)); + clear_used_math(); + return err; +} + +static inline void +new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, + int signo, sigset_t *oldset) +{ + struct new_signal_frame __user *sf; + int sigframe_size, err; + + /* 1. Make sure everything is clean */ + synchronize_user_stack(); + + sigframe_size = NF_ALIGNEDSZ; + if (!used_math()) + sigframe_size -= sizeof(__siginfo_fpu_t); + + sf = (struct new_signal_frame __user *) + get_sigframe(&ka->sa, regs, sigframe_size); + + if (invalid_frame_pointer(sf, sigframe_size)) + goto sigill_and_return; + + if (current_thread_info()->w_saved != 0) + goto sigill_and_return; + + /* 2. Save the current process state */ + err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); + + err |= __put_user(0, &sf->extra_size); + + if (used_math()) { + err |= save_fpu_state(regs, &sf->fpu_state); + err |= __put_user(&sf->fpu_state, &sf->fpu_save); + } else { + err |= __put_user(0, &sf->fpu_save); + } + + err |= __put_user(oldset->sig[0], &sf->info.si_mask); + err |= __copy_to_user(sf->extramask, &oldset->sig[1], + (_NSIG_WORDS - 1) * sizeof(unsigned int)); + err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], + sizeof(struct reg_window)); + if (err) + goto sigsegv; + + /* 3. signal handler back-trampoline and parameters */ + regs->u_regs[UREG_FP] = (unsigned long) sf; + regs->u_regs[UREG_I0] = signo; + regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + regs->u_regs[UREG_I2] = (unsigned long) &sf->info; + + /* 4. signal handler */ + regs->pc = (unsigned long) ka->sa.sa_handler; + regs->npc = (regs->pc + 4); + + /* 5. return to kernel instructions */ + if (ka->ka_restorer) + regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; + else { + regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); + + /* mov __NR_sigreturn, %g1 */ + err |= __put_user(0x821020d8, &sf->insns[0]); + + /* t 0x10 */ + err |= __put_user(0x91d02010, &sf->insns[1]); + if (err) + goto sigsegv; + + /* Flush instruction space. */ + flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); + } + return; + +sigill_and_return: + do_exit(SIGILL); +sigsegv: + force_sigsegv(signo, current); +} + +static inline void +new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, + int signo, sigset_t *oldset, siginfo_t *info) +{ + struct rt_signal_frame __user *sf; + int sigframe_size; + unsigned int psr; + int err; + + synchronize_user_stack(); + sigframe_size = RT_ALIGNEDSZ; + if (!used_math()) + sigframe_size -= sizeof(__siginfo_fpu_t); + sf = (struct rt_signal_frame __user *) + get_sigframe(&ka->sa, regs, sigframe_size); + if (invalid_frame_pointer(sf, sigframe_size)) + goto sigill; + if (current_thread_info()->w_saved != 0) + goto sigill; + + err = __put_user(regs->pc, &sf->regs.pc); + err |= __put_user(regs->npc, &sf->regs.npc); + err |= __put_user(regs->y, &sf->regs.y); + psr = regs->psr; + if (used_math()) + psr |= PSR_EF; + err |= __put_user(psr, &sf->regs.psr); + err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); + err |= __put_user(0, &sf->extra_size); + + if (psr & PSR_EF) { + err |= save_fpu_state(regs, &sf->fpu_state); + err |= __put_user(&sf->fpu_state, &sf->fpu_save); + } else { + err |= __put_user(0, &sf->fpu_save); + } + err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); + + /* Setup sigaltstack */ + err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); + err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); + err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); + + err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], + sizeof(struct reg_window)); + + err |= copy_siginfo_to_user(&sf->info, info); + + if (err) + goto sigsegv; + + regs->u_regs[UREG_FP] = (unsigned long) sf; + regs->u_regs[UREG_I0] = signo; + regs->u_regs[UREG_I1] = (unsigned long) &sf->info; + regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; + + regs->pc = (unsigned long) ka->sa.sa_handler; + regs->npc = (regs->pc + 4); + + if (ka->ka_restorer) + regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; + else { + regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); + + /* mov __NR_sigreturn, %g1 */ + err |= __put_user(0x821020d8, &sf->insns[0]); + + /* t 0x10 */ + err |= __put_user(0x91d02010, &sf->insns[1]); + if (err) + goto sigsegv; + + /* Flush instruction space. */ + flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); + } + return; + +sigill: + do_exit(SIGILL); +sigsegv: + force_sigsegv(signo, current); +} + +/* Setup a Solaris stack frame */ +static inline void +setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, + struct pt_regs *regs, int signr, sigset_t *oldset) +{ + svr4_signal_frame_t __user *sfp; + svr4_gregset_t __user *gr; + svr4_siginfo_t __user *si; + svr4_mcontext_t __user *mc; + svr4_gwindows_t __user *gw; + svr4_ucontext_t __user *uc; + svr4_sigset_t setv; + struct thread_info *tp = current_thread_info(); + int window = 0, err; + + synchronize_user_stack(); + sfp = (svr4_signal_frame_t __user *) + get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window)); + + if (invalid_frame_pointer(sfp, sizeof(*sfp))) + goto sigill_and_return; + + /* Start with a clean frame pointer and fill it */ + err = __clear_user(sfp, sizeof(*sfp)); + + /* Setup convenience variables */ + si = &sfp->si; + uc = &sfp->uc; + gw = &sfp->gw; + mc = &uc->mcontext; + gr = &mc->greg; + + /* FIXME: where am I supposed to put this? + * sc->sigc_onstack = old_status; + * anyways, it does not look like it is used for anything at all. + */ + setv.sigbits[0] = oldset->sig[0]; + setv.sigbits[1] = oldset->sig[1]; + if (_NSIG_WORDS >= 4) { + setv.sigbits[2] = oldset->sig[2]; + setv.sigbits[3] = oldset->sig[3]; + err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); + } else + err |= __copy_to_user(&uc->sigmask, &setv, + 2 * sizeof(unsigned int)); + + /* Store registers */ + err |= __put_user(regs->pc, &((*gr)[SVR4_PC])); + err |= __put_user(regs->npc, &((*gr)[SVR4_NPC])); + err |= __put_user(regs->psr, &((*gr)[SVR4_PSR])); + err |= __put_user(regs->y, &((*gr)[SVR4_Y])); + + /* Copy g[1..7] and o[0..7] registers */ + err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], + sizeof(long) * 7); + err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], + sizeof(long) * 8); + + /* Setup sigaltstack */ + err |= __put_user(current->sas_ss_sp, &uc->stack.sp); + err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); + err |= __put_user(current->sas_ss_size, &uc->stack.size); + + /* Save the currently window file: */ + + /* 1. Link sfp->uc->gwins to our windows */ + err |= __put_user(gw, &mc->gwin); + + /* 2. Number of windows to restore at setcontext(): */ + err |= __put_user(tp->w_saved, &gw->count); + + /* 3. Save each valid window + * Currently, it makes a copy of the windows from the kernel copy. + * David's code for SunOS, makes the copy but keeps the pointer to + * the kernel. My version makes the pointer point to a userland + * copy of those. Mhm, I wonder if I shouldn't just ignore those + * on setcontext and use those that are on the kernel, the signal + * handler should not be modyfing those, mhm. + * + * These windows are just used in case synchronize_user_stack failed + * to flush the user windows. + */ + for (window = 0; window < tp->w_saved; window++) { + err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]); + err |= __copy_to_user(&gw->win[window], + &tp->reg_window[window], + sizeof(svr4_rwindow_t)); + err |= __put_user(0, gw->winptr[window]); + } + + /* 4. We just pay attention to the gw->count field on setcontext */ + tp->w_saved = 0; /* So process is allowed to execute. */ + + /* Setup the signal information. Solaris expects a bunch of + * information to be passed to the signal handler, we don't provide + * that much currently, should use siginfo. + */ + err |= __put_user(signr, &si->siginfo.signo); + err |= __put_user(SVR4_SINOINFO, &si->siginfo.code); + if (err) + goto sigsegv; + + regs->u_regs[UREG_FP] = (unsigned long) sfp; + regs->pc = (unsigned long) sa->sa_handler; + regs->npc = (regs->pc + 4); + + /* Arguments passed to signal handler */ + if (regs->u_regs[14]){ + struct reg_window __user *rw = (struct reg_window __user *) + regs->u_regs[14]; + + err |= __put_user(signr, &rw->ins[0]); + err |= __put_user(si, &rw->ins[1]); + err |= __put_user(uc, &rw->ins[2]); + err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */ + if (err) + goto sigsegv; + + regs->u_regs[UREG_I0] = signr; + regs->u_regs[UREG_I1] = (unsigned long) si; + regs->u_regs[UREG_I2] = (unsigned long) uc; + } + return; + +sigill_and_return: + do_exit(SIGILL); +sigsegv: + force_sigsegv(signr, current); +} + +asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs) +{ + svr4_gregset_t __user *gr; + svr4_mcontext_t __user *mc; + svr4_sigset_t setv; + int err = 0; + + synchronize_user_stack(); + + if (current_thread_info()->w_saved) + return -EFAULT; + + err = clear_user(uc, sizeof(*uc)); + if (err) + return -EFAULT; + + /* Setup convenience variables */ + mc = &uc->mcontext; + gr = &mc->greg; + + setv.sigbits[0] = current->blocked.sig[0]; + setv.sigbits[1] = current->blocked.sig[1]; + if (_NSIG_WORDS >= 4) { + setv.sigbits[2] = current->blocked.sig[2]; + setv.sigbits[3] = current->blocked.sig[3]; + err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); + } else + err |= __copy_to_user(&uc->sigmask, &setv, + 2 * sizeof(unsigned int)); + + /* Store registers */ + err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]); + err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]); + err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]); + err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]); + + /* Copy g[1..7] and o[0..7] registers */ + err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], + sizeof(uint) * 7); + err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], + sizeof(uint) * 8); + + /* Setup sigaltstack */ + err |= __put_user(current->sas_ss_sp, &uc->stack.sp); + err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); + err |= __put_user(current->sas_ss_size, &uc->stack.size); + + /* The register file is not saved + * we have already stuffed all of it with sync_user_stack + */ + return (err ? -EFAULT : 0); +} + +/* Set the context for a svr4 application, this is Solaris way to sigreturn */ +asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs) +{ + svr4_gregset_t __user *gr; + unsigned long pc, npc, psr; + mm_segment_t old_fs; + sigset_t set; + svr4_sigset_t setv; + int err; + stack_t st; + + /* Fixme: restore windows, or is this already taken care of in + * svr4_setup_frame when sync_user_windows is done? + */ + flush_user_windows(); + + if (current_thread_info()->w_saved) + goto sigsegv_and_return; + + if (((unsigned long) c) & 3) + goto sigsegv_and_return; + + if (!__access_ok((unsigned long)c, sizeof(*c))) + goto sigsegv_and_return; + + /* Check for valid PC and nPC */ + gr = &c->mcontext.greg; + err = __get_user(pc, &((*gr)[SVR4_PC])); + err |= __get_user(npc, &((*gr)[SVR4_NPC])); + + if ((pc | npc) & 3) + goto sigsegv_and_return; + + /* Retrieve information from passed ucontext */ + /* note that nPC is ored a 1, this is used to inform entry.S */ + /* that we don't want it to mess with our PC and nPC */ + + /* This is pretty much atomic, no amount locking would prevent + * the races which exist anyways. + */ + err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); + + err |= __get_user(st.ss_sp, &c->stack.sp); + err |= __get_user(st.ss_flags, &c->stack.flags); + err |= __get_user(st.ss_size, &c->stack.size); + + if (err) + goto sigsegv_and_return; + + /* It is more difficult to avoid calling this function than to + call it and ignore errors. */ + old_fs = get_fs(); + set_fs(KERNEL_DS); + do_sigaltstack((const stack_t __user *) &st, NULL, + regs->u_regs[UREG_I6]); + set_fs(old_fs); + + set.sig[0] = setv.sigbits[0]; + set.sig[1] = setv.sigbits[1]; + if (_NSIG_WORDS >= 4) { + set.sig[2] = setv.sigbits[2]; + set.sig[3] = setv.sigbits[3]; + } + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + regs->pc = pc; + regs->npc = npc | 1; + err |= __get_user(regs->y, &((*gr)[SVR4_Y])); + err |= __get_user(psr, &((*gr)[SVR4_PSR])); + regs->psr &= ~(PSR_ICC); + regs->psr |= (psr & PSR_ICC); + + /* Restore g[1..7] and o[0..7] registers */ + err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1], + sizeof(long) * 7); + err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0], + sizeof(long) * 8); + return (err ? -EFAULT : 0); + +sigsegv_and_return: + force_sig(SIGSEGV, current); + return -EFAULT; +} + +static inline void +handle_signal(unsigned long signr, struct k_sigaction *ka, + siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, + int svr4_signal) +{ + if (svr4_signal) + setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); + else { + if (ka->sa.sa_flags & SA_SIGINFO) + new_setup_rt_frame(ka, regs, signr, oldset, info); + else if (current->thread.new_signal) + new_setup_frame(ka, regs, signr, oldset); + else + setup_frame(&ka->sa, regs, signr, oldset, info); + } + if (!(ka->sa.sa_flags & SA_NOMASK)) { + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + sigaddset(¤t->blocked, signr); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + } +} + +static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, + struct sigaction *sa) +{ + switch(regs->u_regs[UREG_I0]) { + case ERESTART_RESTARTBLOCK: + case ERESTARTNOHAND: + no_system_call_restart: + regs->u_regs[UREG_I0] = EINTR; + regs->psr |= PSR_C; + break; + case ERESTARTSYS: + if (!(sa->sa_flags & SA_RESTART)) + goto no_system_call_restart; + /* fallthrough */ + case ERESTARTNOINTR: + regs->u_regs[UREG_I0] = orig_i0; + regs->pc -= 4; + regs->npc -= 4; + } +} + +/* Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + */ +asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, + unsigned long orig_i0, int restart_syscall) +{ + siginfo_t info; + struct sparc_deliver_cookie cookie; + struct k_sigaction ka; + int signr; + + /* + * XXX Disable svr4 signal handling until solaris emulation works. + * It is buggy - Anton + */ +#define SVR4_SIGNAL_BROKEN 1 +#ifdef SVR4_SIGNAL_BROKEN + int svr4_signal = 0; +#else + int svr4_signal = current->personality == PER_SVR4; +#endif + + cookie.restart_syscall = restart_syscall; + cookie.orig_i0 = orig_i0; + + if (!oldset) + oldset = ¤t->blocked; + + signr = get_signal_to_deliver(&info, &ka, regs, &cookie); + if (signr > 0) { + if (cookie.restart_syscall) + syscall_restart(cookie.orig_i0, regs, &ka.sa); + handle_signal(signr, &ka, &info, oldset, + regs, svr4_signal); + return 1; + } + if (cookie.restart_syscall && + (regs->u_regs[UREG_I0] == ERESTARTNOHAND || + regs->u_regs[UREG_I0] == ERESTARTSYS || + regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { + /* replay the system call when we are done */ + regs->u_regs[UREG_I0] = cookie.orig_i0; + regs->pc -= 4; + regs->npc -= 4; + } + if (cookie.restart_syscall && + regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { + regs->u_regs[UREG_G1] = __NR_restart_syscall; + regs->pc -= 4; + regs->npc -= 4; + } + return 0; +} + +asmlinkage int +do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr, + unsigned long sp) +{ + int ret = -EFAULT; + + /* First see if old state is wanted. */ + if (ossptr) { + if (put_user(current->sas_ss_sp + current->sas_ss_size, + &ossptr->the_stack) || + __put_user(on_sig_stack(sp), &ossptr->cur_status)) + goto out; + } + + /* Now see if we want to update the new state. */ + if (ssptr) { + char *ss_sp; + + if (get_user(ss_sp, &ssptr->the_stack)) + goto out; + /* If the current stack was set with sigaltstack, don't + swap stacks while we are on it. */ + ret = -EPERM; + if (current->sas_ss_sp && on_sig_stack(sp)) + goto out; + + /* Since we don't know the extent of the stack, and we don't + track onstack-ness, but rather calculate it, we must + presume a size. Ho hum this interface is lossy. */ + current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; + current->sas_ss_size = SIGSTKSZ; + } + ret = 0; +out: + return ret; +} + +void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) +{ + struct sparc_deliver_cookie *cp = cookie; + + if (cp->restart_syscall && + (regs->u_regs[UREG_I0] == ERESTARTNOHAND || + regs->u_regs[UREG_I0] == ERESTARTSYS || + regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { + /* replay the system call when we are done */ + regs->u_regs[UREG_I0] = cp->orig_i0; + regs->pc -= 4; + regs->npc -= 4; + cp->restart_syscall = 0; + } + + if (cp->restart_syscall && + regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { + regs->u_regs[UREG_G1] = __NR_restart_syscall; + regs->pc -= 4; + regs->npc -= 4; + cp->restart_syscall = 0; + } +} |
