diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/kernel/signal.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/kernel/signal.c | 522 |
1 files changed, 0 insertions, 522 deletions
diff --git a/ANDROID_3.4.5/arch/s390/kernel/signal.c b/ANDROID_3.4.5/arch/s390/kernel/signal.c deleted file mode 100644 index f7582b27..00000000 --- a/ANDROID_3.4.5/arch/s390/kernel/signal.c +++ /dev/null @@ -1,522 +0,0 @@ -/* - * arch/s390/kernel/signal.c - * - * Copyright (C) IBM Corp. 1999,2006 - * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) - * - * Based on Intel version - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson - */ - -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/smp.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/stddef.h> -#include <linux/tty.h> -#include <linux/personality.h> -#include <linux/binfmts.h> -#include <linux/tracehook.h> -#include <linux/syscalls.h> -#include <linux/compat.h> -#include <asm/ucontext.h> -#include <asm/uaccess.h> -#include <asm/lowcore.h> -#include <asm/switch_to.h> -#include "entry.h" - -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - - -typedef struct -{ - __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; - struct sigcontext sc; - _sigregs sregs; - int signo; - __u8 retcode[S390_SYSCALL_SIZE]; -} sigframe; - -typedef struct -{ - __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; - __u8 retcode[S390_SYSCALL_SIZE]; - struct siginfo info; - struct ucontext uc; -} rt_sigframe; - -/* - * Atomically swap in the new signal mask, and wait for a signal. - */ -SYSCALL_DEFINE3(sigsuspend, int, history0, int, history1, old_sigset_t, mask) -{ - sigset_t blocked; - - current->saved_sigmask = current->blocked; - mask &= _BLOCKABLE; - siginitset(&blocked, mask); - set_current_blocked(&blocked); - set_current_state(TASK_INTERRUPTIBLE); - schedule(); - set_restore_sigmask(); - return -ERESTARTNOHAND; -} - -SYSCALL_DEFINE3(sigaction, int, sig, const struct old_sigaction __user *, act, - struct old_sigaction __user *, oact) -{ - struct k_sigaction new_ka, old_ka; - int ret; - - if (act) { - old_sigset_t mask; - if (!access_ok(VERIFY_READ, act, sizeof(*act)) || - __get_user(new_ka.sa.sa_handler, &act->sa_handler) || - __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || - __get_user(new_ka.sa.sa_flags, &act->sa_flags) || - __get_user(mask, &act->sa_mask)) - return -EFAULT; - siginitset(&new_ka.sa.sa_mask, mask); - } - - ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); - - if (!ret && oact) { - if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || - __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || - __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || - __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || - __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) - return -EFAULT; - } - - return ret; -} - -SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, - stack_t __user *, uoss) -{ - struct pt_regs *regs = task_pt_regs(current); - return do_sigaltstack(uss, uoss, regs->gprs[15]); -} - -/* Returns non-zero on fault. */ -static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) -{ - _sigregs user_sregs; - - save_access_regs(current->thread.acrs); - - /* Copy a 'clean' PSW mask to the user to avoid leaking - information about whether PER is currently on. */ - user_sregs.regs.psw.mask = psw_user_bits | - (regs->psw.mask & PSW_MASK_USER); - user_sregs.regs.psw.addr = regs->psw.addr; - memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); - memcpy(&user_sregs.regs.acrs, current->thread.acrs, - sizeof(sregs->regs.acrs)); - /* - * We have to store the fp registers to current->thread.fp_regs - * to merge them with the emulated registers. - */ - save_fp_regs(¤t->thread.fp_regs); - memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, - sizeof(s390_fp_regs)); - return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); -} - -/* Returns positive number on error */ -static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) -{ - int err; - _sigregs user_sregs; - - /* Alwys make any pending restarted system call return -EINTR */ - current_thread_info()->restart_block.fn = do_no_restart_syscall; - - err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); - if (err) - return err; - /* Use regs->psw.mask instead of psw_user_bits to preserve PER bit. */ - regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | - (user_sregs.regs.psw.mask & PSW_MASK_USER); - /* Check for invalid amode */ - if (regs->psw.mask & PSW_MASK_EA) - regs->psw.mask |= PSW_MASK_BA; - regs->psw.addr = user_sregs.regs.psw.addr; - memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); - memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, - sizeof(sregs->regs.acrs)); - restore_access_regs(current->thread.acrs); - - memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, - sizeof(s390_fp_regs)); - current->thread.fp_regs.fpc &= FPC_VALID_MASK; - - restore_fp_regs(¤t->thread.fp_regs); - clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */ - return 0; -} - -SYSCALL_DEFINE0(sigreturn) -{ - struct pt_regs *regs = task_pt_regs(current); - sigframe __user *frame = (sigframe __user *)regs->gprs[15]; - sigset_t set; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) - goto badframe; - sigdelsetmask(&set, ~_BLOCKABLE); - set_current_blocked(&set); - if (restore_sigregs(regs, &frame->sregs)) - goto badframe; - return regs->gprs[2]; -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -SYSCALL_DEFINE0(rt_sigreturn) -{ - struct pt_regs *regs = task_pt_regs(current); - rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; - sigset_t set; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - sigdelsetmask(&set, ~_BLOCKABLE); - set_current_blocked(&set); - if (restore_sigregs(regs, &frame->uc.uc_mcontext)) - goto badframe; - if (do_sigaltstack(&frame->uc.uc_stack, NULL, - regs->gprs[15]) == -EFAULT) - goto badframe; - return regs->gprs[2]; -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * Set up a signal frame. - */ - - -/* - * Determine which stack to use.. - */ -static inline void __user * -get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) -{ - unsigned long sp; - - /* Default to using normal stack */ - sp = regs->gprs[15]; - - /* Overflow on alternate signal stack gives SIGSEGV. */ - if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) - return (void __user *) -1UL; - - /* This is the X/Open sanctioned signal stack switching. */ - if (ka->sa.sa_flags & SA_ONSTACK) { - if (! sas_ss_flags(sp)) - sp = current->sas_ss_sp + current->sas_ss_size; - } - - /* This is the legacy signal stack switching. */ - else if (!user_mode(regs) && - !(ka->sa.sa_flags & SA_RESTORER) && - ka->sa.sa_restorer) { - sp = (unsigned long) ka->sa.sa_restorer; - } - - return (void __user *)((sp - frame_size) & -8ul); -} - -static inline int map_signal(int sig) -{ - if (current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32) - return current_thread_info()->exec_domain->signal_invmap[sig]; - else - return sig; -} - -static int setup_frame(int sig, struct k_sigaction *ka, - sigset_t *set, struct pt_regs * regs) -{ - sigframe __user *frame; - - frame = get_sigframe(ka, regs, sizeof(sigframe)); - if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) - goto give_sigsegv; - - if (frame == (void __user *) -1UL) - goto give_sigsegv; - - if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) - goto give_sigsegv; - - if (save_sigregs(regs, &frame->sregs)) - goto give_sigsegv; - if (__put_user(&frame->sregs, &frame->sc.sregs)) - goto give_sigsegv; - - /* Set up to return from userspace. If provided, use a stub - already in userspace. */ - if (ka->sa.sa_flags & SA_RESTORER) { - regs->gprs[14] = (unsigned long) - ka->sa.sa_restorer | PSW_ADDR_AMODE; - } else { - regs->gprs[14] = (unsigned long) - frame->retcode | PSW_ADDR_AMODE; - if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, - (u16 __user *)(frame->retcode))) - goto give_sigsegv; - } - - /* Set up backchain. */ - if (__put_user(regs->gprs[15], (addr_t __user *) frame)) - goto give_sigsegv; - - /* Set up registers for signal handler */ - regs->gprs[15] = (unsigned long) frame; - regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ - regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; - - regs->gprs[2] = map_signal(sig); - regs->gprs[3] = (unsigned long) &frame->sc; - - /* We forgot to include these in the sigcontext. - To avoid breaking binary compatibility, they are passed as args. */ - if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || - sig == SIGTRAP || sig == SIGFPE) { - /* set extra registers only for synchronous signals */ - regs->gprs[4] = regs->int_code & 127; - regs->gprs[5] = regs->int_parm_long; - regs->gprs[6] = task_thread_info(current)->last_break; - } - - /* Place signal number on stack to allow backtrace from handler. */ - if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) - goto give_sigsegv; - return 0; - -give_sigsegv: - force_sigsegv(sig, current); - return -EFAULT; -} - -static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, - sigset_t *set, struct pt_regs * regs) -{ - int err = 0; - rt_sigframe __user *frame; - - frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); - if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) - goto give_sigsegv; - - if (frame == (void __user *) -1UL) - goto give_sigsegv; - - if (copy_siginfo_to_user(&frame->info, info)) - goto give_sigsegv; - - /* Create the ucontext. */ - err |= __put_user(0, &frame->uc.uc_flags); - err |= __put_user(NULL, &frame->uc.uc_link); - err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); - err |= __put_user(sas_ss_flags(regs->gprs[15]), - &frame->uc.uc_stack.ss_flags); - err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= save_sigregs(regs, &frame->uc.uc_mcontext); - err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - if (err) - goto give_sigsegv; - - /* Set up to return from userspace. If provided, use a stub - already in userspace. */ - if (ka->sa.sa_flags & SA_RESTORER) { - regs->gprs[14] = (unsigned long) - ka->sa.sa_restorer | PSW_ADDR_AMODE; - } else { - regs->gprs[14] = (unsigned long) - frame->retcode | PSW_ADDR_AMODE; - if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, - (u16 __user *)(frame->retcode))) - goto give_sigsegv; - } - - /* Set up backchain. */ - if (__put_user(regs->gprs[15], (addr_t __user *) frame)) - goto give_sigsegv; - - /* Set up registers for signal handler */ - regs->gprs[15] = (unsigned long) frame; - regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ - regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; - - regs->gprs[2] = map_signal(sig); - regs->gprs[3] = (unsigned long) &frame->info; - regs->gprs[4] = (unsigned long) &frame->uc; - regs->gprs[5] = task_thread_info(current)->last_break; - return 0; - -give_sigsegv: - force_sigsegv(sig, current); - return -EFAULT; -} - -static int handle_signal(unsigned long sig, struct k_sigaction *ka, - siginfo_t *info, sigset_t *oldset, - struct pt_regs *regs) -{ - int ret; - - /* Set up the stack frame */ - if (ka->sa.sa_flags & SA_SIGINFO) - ret = setup_rt_frame(sig, ka, info, oldset, regs); - else - ret = setup_frame(sig, ka, oldset, regs); - if (ret) - return ret; - block_sigmask(ka, sig); - return 0; -} - -/* - * 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. - * - * Note that we go through the signals twice: once to check the signals that - * the kernel can handle, and then we build all the user-level signal handling - * stack-frames in one go after that. - */ -void do_signal(struct pt_regs *regs) -{ - siginfo_t info; - int signr; - struct k_sigaction ka; - sigset_t *oldset; - - /* - * 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(regs)) - return; - - if (test_thread_flag(TIF_RESTORE_SIGMASK)) - oldset = ¤t->saved_sigmask; - else - oldset = ¤t->blocked; - - /* - * Get signal to deliver. When running under ptrace, at this point - * the debugger may change all our registers, including the system - * call information. - */ - current_thread_info()->system_call = - test_thread_flag(TIF_SYSCALL) ? regs->int_code : 0; - signr = get_signal_to_deliver(&info, &ka, regs, NULL); - - if (signr > 0) { - /* Whee! Actually deliver the signal. */ - if (current_thread_info()->system_call) { - regs->int_code = current_thread_info()->system_call; - /* Check for system call restarting. */ - switch (regs->gprs[2]) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - regs->gprs[2] = -EINTR; - break; - case -ERESTARTSYS: - if (!(ka.sa.sa_flags & SA_RESTART)) { - regs->gprs[2] = -EINTR; - break; - } - /* fallthrough */ - case -ERESTARTNOINTR: - regs->gprs[2] = regs->orig_gpr2; - regs->psw.addr = - __rewind_psw(regs->psw, - regs->int_code >> 16); - break; - } - } - /* No longer in a system call */ - clear_thread_flag(TIF_SYSCALL); - - if ((is_compat_task() ? - handle_signal32(signr, &ka, &info, oldset, regs) : - handle_signal(signr, &ka, &info, oldset, regs)) == 0) { - /* - * 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 TIF_RESTORE_SIGMASK flag. - */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) - clear_thread_flag(TIF_RESTORE_SIGMASK); - - /* - * Let tracing know that we've done the handler setup. - */ - tracehook_signal_handler(signr, &info, &ka, regs, - test_thread_flag(TIF_SINGLE_STEP)); - } - return; - } - - /* No handlers present - check for system call restart */ - clear_thread_flag(TIF_SYSCALL); - if (current_thread_info()->system_call) { - regs->int_code = current_thread_info()->system_call; - switch (regs->gprs[2]) { - case -ERESTART_RESTARTBLOCK: - /* Restart with sys_restart_syscall */ - regs->int_code = __NR_restart_syscall; - /* fallthrough */ - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - /* Restart system call with magic TIF bit. */ - regs->gprs[2] = regs->orig_gpr2; - set_thread_flag(TIF_SYSCALL); - break; - } - } - - /* - * If there's no signal to deliver, we just put the saved sigmask back. - */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) { - clear_thread_flag(TIF_RESTORE_SIGMASK); - sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); - } -} - -void do_notify_resume(struct pt_regs *regs) -{ - clear_thread_flag(TIF_NOTIFY_RESUME); - tracehook_notify_resume(regs); - if (current->replacement_session_keyring) - key_replace_session_keyring(); -} |