diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/ia64/kernel/signal.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/ia64/kernel/signal.c | 556 |
1 files changed, 0 insertions, 556 deletions
diff --git a/ANDROID_3.4.5/arch/ia64/kernel/signal.c b/ANDROID_3.4.5/arch/ia64/kernel/signal.c deleted file mode 100644 index 7bdafc87..00000000 --- a/ANDROID_3.4.5/arch/ia64/kernel/signal.c +++ /dev/null @@ -1,556 +0,0 @@ -/* - * Architecture-specific signal handling support. - * - * Copyright (C) 1999-2004 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * - * Derived from i386 and Alpha versions. - */ - -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/ptrace.h> -#include <linux/tracehook.h> -#include <linux/sched.h> -#include <linux/signal.h> -#include <linux/smp.h> -#include <linux/stddef.h> -#include <linux/tty.h> -#include <linux/binfmts.h> -#include <linux/unistd.h> -#include <linux/wait.h> - -#include <asm/intrinsics.h> -#include <asm/uaccess.h> -#include <asm/rse.h> -#include <asm/sigcontext.h> - -#include "sigframe.h" - -#define DEBUG_SIG 0 -#define STACK_ALIGN 16 /* minimal alignment for stack pointer */ -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -#if _NSIG_WORDS > 1 -# define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t)) -# define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t)) -#else -# define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0]) -# define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0]) -#endif - -asmlinkage long -sys_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, long arg2, - long arg3, long arg4, long arg5, long arg6, long arg7, - struct pt_regs regs) -{ - return do_sigaltstack(uss, uoss, regs.r12); -} - -static long -restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr) -{ - unsigned long ip, flags, nat, um, cfm, rsc; - long err; - - /* Always make any pending restarted system calls return -EINTR */ - current_thread_info()->restart_block.fn = do_no_restart_syscall; - - /* restore scratch that always needs gets updated during signal delivery: */ - err = __get_user(flags, &sc->sc_flags); - err |= __get_user(nat, &sc->sc_nat); - err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */ - err |= __get_user(cfm, &sc->sc_cfm); - err |= __get_user(um, &sc->sc_um); /* user mask */ - err |= __get_user(rsc, &sc->sc_ar_rsc); - err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat); - err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); - err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs); - err |= __get_user(scr->pt.pr, &sc->sc_pr); /* predicates */ - err |= __get_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */ - err |= __get_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */ - err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8); /* r1 */ - err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8); /* r8-r11 */ - err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8); /* r12-r13 */ - err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8); /* r15 */ - - scr->pt.cr_ifs = cfm | (1UL << 63); - scr->pt.ar_rsc = rsc | (3 << 2); /* force PL3 */ - - /* establish new instruction pointer: */ - scr->pt.cr_iip = ip & ~0x3UL; - ia64_psr(&scr->pt)->ri = ip & 0x3; - scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM); - - scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat); - - if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) { - /* Restore most scratch-state only when not in syscall. */ - err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */ - err |= __get_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */ - err |= __get_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */ - err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8); /* ar.csd & ar.ssd */ - err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8); /* r2-r3 */ - err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8); /* r16-r31 */ - } - - if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) { - struct ia64_psr *psr = ia64_psr(&scr->pt); - - err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16); - psr->mfh = 0; /* drop signal handler's fph contents... */ - preempt_disable(); - if (psr->dfh) - ia64_drop_fpu(current); - else { - /* We already own the local fph, otherwise psr->dfh wouldn't be 0. */ - __ia64_load_fpu(current->thread.fph); - ia64_set_local_fpu_owner(current); - } - preempt_enable(); - } - return err; -} - -int -copy_siginfo_to_user (siginfo_t __user *to, siginfo_t *from) -{ - if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t))) - return -EFAULT; - if (from->si_code < 0) { - if (__copy_to_user(to, from, sizeof(siginfo_t))) - return -EFAULT; - return 0; - } else { - int err; - - /* - * If you change siginfo_t structure, please be sure this code is fixed - * accordingly. It should never copy any pad contained in the structure - * to avoid security leaks, but must copy the generic 3 ints plus the - * relevant union member. - */ - err = __put_user(from->si_signo, &to->si_signo); - err |= __put_user(from->si_errno, &to->si_errno); - err |= __put_user((short)from->si_code, &to->si_code); - switch (from->si_code >> 16) { - case __SI_FAULT >> 16: - err |= __put_user(from->si_flags, &to->si_flags); - err |= __put_user(from->si_isr, &to->si_isr); - case __SI_POLL >> 16: - err |= __put_user(from->si_addr, &to->si_addr); - err |= __put_user(from->si_imm, &to->si_imm); - break; - case __SI_TIMER >> 16: - err |= __put_user(from->si_tid, &to->si_tid); - err |= __put_user(from->si_overrun, &to->si_overrun); - err |= __put_user(from->si_ptr, &to->si_ptr); - break; - case __SI_RT >> 16: /* Not generated by the kernel as of now. */ - case __SI_MESGQ >> 16: - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_pid, &to->si_pid); - err |= __put_user(from->si_ptr, &to->si_ptr); - break; - case __SI_CHLD >> 16: - err |= __put_user(from->si_utime, &to->si_utime); - err |= __put_user(from->si_stime, &to->si_stime); - err |= __put_user(from->si_status, &to->si_status); - default: - err |= __put_user(from->si_uid, &to->si_uid); - err |= __put_user(from->si_pid, &to->si_pid); - break; - } - return err; - } -} - -long -ia64_rt_sigreturn (struct sigscratch *scr) -{ - extern char ia64_strace_leave_kernel, ia64_leave_kernel; - struct sigcontext __user *sc; - struct siginfo si; - sigset_t set; - long retval; - - sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc; - - /* - * When we return to the previously executing context, r8 and r10 have already - * been setup the way we want them. Indeed, if the signal wasn't delivered while - * in a system call, we must not touch r8 or r10 as otherwise user-level state - * could be corrupted. - */ - retval = (long) &ia64_leave_kernel; - if (test_thread_flag(TIF_SYSCALL_TRACE) - || test_thread_flag(TIF_SYSCALL_AUDIT)) - /* - * strace expects to be notified after sigreturn returns even though the - * context to which we return may not be in the middle of a syscall. - * Thus, the return-value that strace displays for sigreturn is - * meaningless. - */ - retval = (long) &ia64_strace_leave_kernel; - - if (!access_ok(VERIFY_READ, sc, sizeof(*sc))) - goto give_sigsegv; - - if (GET_SIGSET(&set, &sc->sc_mask)) - goto give_sigsegv; - - sigdelsetmask(&set, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - { - current->blocked = set; - recalc_sigpending(); - } - spin_unlock_irq(¤t->sighand->siglock); - - if (restore_sigcontext(sc, scr)) - goto give_sigsegv; - -#if DEBUG_SIG - printk("SIG return (%s:%d): sp=%lx ip=%lx\n", - current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip); -#endif - /* - * It is more difficult to avoid calling this function than to - * call it and ignore errors. - */ - do_sigaltstack(&sc->sc_stack, NULL, scr->pt.r12); - return retval; - - give_sigsegv: - si.si_signo = SIGSEGV; - si.si_errno = 0; - si.si_code = SI_KERNEL; - si.si_pid = task_pid_vnr(current); - si.si_uid = current_uid(); - si.si_addr = sc; - force_sig_info(SIGSEGV, &si, current); - return retval; -} - -/* - * This does just the minimum required setup of sigcontext. - * Specifically, it only installs data that is either not knowable at - * the user-level or that gets modified before execution in the - * trampoline starts. Everything else is done at the user-level. - */ -static long -setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr) -{ - unsigned long flags = 0, ifs, cfm, nat; - long err = 0; - - ifs = scr->pt.cr_ifs; - - if (on_sig_stack((unsigned long) sc)) - flags |= IA64_SC_FLAG_ONSTACK; - if ((ifs & (1UL << 63)) == 0) - /* if cr_ifs doesn't have the valid bit set, we got here through a syscall */ - flags |= IA64_SC_FLAG_IN_SYSCALL; - cfm = ifs & ((1UL << 38) - 1); - ia64_flush_fph(current); - if ((current->thread.flags & IA64_THREAD_FPH_VALID)) { - flags |= IA64_SC_FLAG_FPH_VALID; - err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16); - } - - nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat); - - err |= __put_user(flags, &sc->sc_flags); - err |= __put_user(nat, &sc->sc_nat); - err |= PUT_SIGSET(mask, &sc->sc_mask); - err |= __put_user(cfm, &sc->sc_cfm); - err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um); - err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc); - err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat); /* ar.unat */ - err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); /* ar.fpsr */ - err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs); - err |= __put_user(scr->pt.pr, &sc->sc_pr); /* predicates */ - err |= __put_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */ - err |= __put_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */ - err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8); /* r1 */ - err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8); /* r8-r11 */ - err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8); /* r12-r13 */ - err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8); /* r15 */ - err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip); - - if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) { - /* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */ - err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */ - err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */ - err |= __put_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */ - err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8); /* ar.csd & ar.ssd */ - err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8); /* r2-r3 */ - err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8); /* r16-r31 */ - } - return err; -} - -/* - * Check whether the register-backing store is already on the signal stack. - */ -static inline int -rbs_on_sig_stack (unsigned long bsp) -{ - return (bsp - current->sas_ss_sp < current->sas_ss_size); -} - -static long -force_sigsegv_info (int sig, void __user *addr) -{ - unsigned long flags; - struct siginfo si; - - if (sig == SIGSEGV) { - /* - * Acquiring siglock around the sa_handler-update is almost - * certainly overkill, but this isn't a - * performance-critical path and I'd rather play it safe - * here than having to debug a nasty race if and when - * something changes in kernel/signal.c that would make it - * no longer safe to modify sa_handler without holding the - * lock. - */ - spin_lock_irqsave(¤t->sighand->siglock, flags); - current->sighand->action[sig - 1].sa.sa_handler = SIG_DFL; - spin_unlock_irqrestore(¤t->sighand->siglock, flags); - } - si.si_signo = SIGSEGV; - si.si_errno = 0; - si.si_code = SI_KERNEL; - si.si_pid = task_pid_vnr(current); - si.si_uid = current_uid(); - si.si_addr = addr; - force_sig_info(SIGSEGV, &si, current); - return 0; -} - -static long -setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set, - struct sigscratch *scr) -{ - extern char __kernel_sigtramp[]; - unsigned long tramp_addr, new_rbs = 0, new_sp; - struct sigframe __user *frame; - long err; - - new_sp = scr->pt.r12; - tramp_addr = (unsigned long) __kernel_sigtramp; - if (ka->sa.sa_flags & SA_ONSTACK) { - int onstack = sas_ss_flags(new_sp); - - if (onstack == 0) { - new_sp = current->sas_ss_sp + current->sas_ss_size; - /* - * We need to check for the register stack being on the - * signal stack separately, because it's switched - * separately (memory stack is switched in the kernel, - * register stack is switched in the signal trampoline). - */ - if (!rbs_on_sig_stack(scr->pt.ar_bspstore)) - new_rbs = ALIGN(current->sas_ss_sp, - sizeof(long)); - } else if (onstack == SS_ONSTACK) { - unsigned long check_sp; - - /* - * 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. - */ - check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN; - if (!likely(on_sig_stack(check_sp))) - return force_sigsegv_info(sig, (void __user *) - check_sp); - } - } - frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return force_sigsegv_info(sig, frame); - - err = __put_user(sig, &frame->arg0); - err |= __put_user(&frame->info, &frame->arg1); - err |= __put_user(&frame->sc, &frame->arg2); - err |= __put_user(new_rbs, &frame->sc.sc_rbs_base); - err |= __put_user(0, &frame->sc.sc_loadrs); /* initialize to zero */ - err |= __put_user(ka->sa.sa_handler, &frame->handler); - - err |= copy_siginfo_to_user(&frame->info, info); - - err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp); - err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size); - err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags); - err |= setup_sigcontext(&frame->sc, set, scr); - - if (unlikely(err)) - return force_sigsegv_info(sig, frame); - - scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */ - scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */ - scr->pt.cr_iip = tramp_addr; - ia64_psr(&scr->pt)->ri = 0; /* start executing in first slot */ - ia64_psr(&scr->pt)->be = 0; /* force little-endian byte-order */ - /* - * Force the interruption function mask to zero. This has no effect when a - * system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is - * ignored), but it has the desirable effect of making it possible to deliver a - * signal with an incomplete register frame (which happens when a mandatory RSE - * load faults). Furthermore, it has no negative effect on the getting the user's - * dirty partition preserved, because that's governed by scr->pt.loadrs. - */ - scr->pt.cr_ifs = (1UL << 63); - - /* - * Note: this affects only the NaT bits of the scratch regs (the ones saved in - * pt_regs), which is exactly what we want. - */ - scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */ - -#if DEBUG_SIG - printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n", - current->comm, current->pid, sig, scr->pt.r12, frame->sc.sc_ip, frame->handler); -#endif - return 1; -} - -static long -handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, - struct sigscratch *scr) -{ - if (!setup_frame(sig, ka, info, oldset, scr)) - return 0; - - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(¤t->blocked, sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - /* - * Let tracing know that we've done the handler setup. - */ - tracehook_signal_handler(sig, info, ka, &scr->pt, - test_thread_flag(TIF_SINGLESTEP)); - - return 1; -} - -/* - * 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. - */ -void -ia64_do_signal (struct sigscratch *scr, long in_syscall) -{ - struct k_sigaction ka; - sigset_t *oldset; - siginfo_t info; - long restart = in_syscall; - long errno = scr->pt.r8; - - /* - * In the ia64_leave_kernel code path, we want the common case to go fast, which - * is why we may in certain cases get here from kernel mode. Just return without - * doing anything if so. - */ - if (!user_mode(&scr->pt)) - return; - - if (current_thread_info()->status & TS_RESTORE_SIGMASK) - oldset = ¤t->saved_sigmask; - else - oldset = ¤t->blocked; - - /* - * This only loops in the rare cases of handle_signal() failing, in which case we - * need to push through a forced SIGSEGV. - */ - while (1) { - int signr = get_signal_to_deliver(&info, &ka, &scr->pt, NULL); - - /* - * get_signal_to_deliver() may have run a debugger (via notify_parent()) - * and the debugger may have modified the state (e.g., to arrange for an - * inferior call), thus it's important to check for restarting _after_ - * get_signal_to_deliver(). - */ - if ((long) scr->pt.r10 != -1) - /* - * A system calls has to be restarted only if one of the error codes - * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10 - * isn't -1 then r8 doesn't hold an error code and we don't need to - * restart the syscall, so we can clear the "restart" flag here. - */ - restart = 0; - - if (signr <= 0) - break; - - if (unlikely(restart)) { - switch (errno) { - case ERESTART_RESTARTBLOCK: - case ERESTARTNOHAND: - scr->pt.r8 = EINTR; - /* note: scr->pt.r10 is already -1 */ - break; - - case ERESTARTSYS: - if ((ka.sa.sa_flags & SA_RESTART) == 0) { - scr->pt.r8 = EINTR; - /* note: scr->pt.r10 is already -1 */ - break; - } - case ERESTARTNOINTR: - ia64_decrement_ip(&scr->pt); - restart = 0; /* don't restart twice if handle_signal() fails... */ - } - } - - /* - * Whee! Actually deliver the signal. If the delivery failed, we need to - * continue to iterate in this loop so we can deliver the SIGSEGV... - */ - if (handle_signal(signr, &ka, &info, oldset, scr)) { - /* - * A signal was successfully delivered; the saved - * sigmask will have been stored in the signal frame, - * and will be restored by sigreturn, so we can simply - * clear the TS_RESTORE_SIGMASK flag. - */ - current_thread_info()->status &= ~TS_RESTORE_SIGMASK; - return; - } - } - - /* Did we come from a system call? */ - if (restart) { - /* Restart the system call - no handlers present */ - if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR - || errno == ERESTART_RESTARTBLOCK) - { - /* - * Note: the syscall number is in r15 which is saved in - * pt_regs so all we need to do here is adjust ip so that - * the "break" instruction gets re-executed. - */ - ia64_decrement_ip(&scr->pt); - if (errno == ERESTART_RESTARTBLOCK) - scr->pt.r15 = __NR_restart_syscall; - } - } - - /* if there's no signal to deliver, we just put the saved sigmask - * back */ - if (current_thread_info()->status & TS_RESTORE_SIGMASK) { - current_thread_info()->status &= ~TS_RESTORE_SIGMASK; - sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); - } -} |