diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/microblaze/kernel/signal.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/microblaze/kernel/signal.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/ANDROID_3.4.5/arch/microblaze/kernel/signal.c b/ANDROID_3.4.5/arch/microblaze/kernel/signal.c deleted file mode 100644 index 59967116..00000000 --- a/ANDROID_3.4.5/arch/microblaze/kernel/signal.c +++ /dev/null @@ -1,404 +0,0 @@ -/* - * Signal handling - * - * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> - * Copyright (C) 2008-2009 PetaLogix - * Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au> - * Copyright (C) 2001 NEC Corporation - * Copyright (C) 2001 Miles Bader <miles@gnu.org> - * Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima - * Copyright (C) 1991,1992 Linus Torvalds - * - * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson - * - * This file was was derived from the sh version, arch/sh/kernel/signal.c - * - * This file is subject to the terms and conditions of the GNU General - * Public License. See the file COPYING in the main directory of this - * archive for more details. - */ - -#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/personality.h> -#include <linux/percpu.h> -#include <linux/linkage.h> -#include <asm/entry.h> -#include <asm/ucontext.h> -#include <linux/uaccess.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <linux/syscalls.h> -#include <asm/cacheflush.h> -#include <asm/syscalls.h> - -#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) - -asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall); - -asmlinkage long -sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, - struct pt_regs *regs) -{ - return do_sigaltstack(uss, uoss, regs->r1); -} - -/* - * Do a signal return; undo the signal stack. - */ -struct sigframe { - struct sigcontext sc; - unsigned long extramask[_NSIG_WORDS-1]; - unsigned long tramp[2]; /* signal trampoline */ -}; - -struct rt_sigframe { - struct siginfo info; - struct ucontext uc; - unsigned long tramp[2]; /* signal trampoline */ -}; - -static int restore_sigcontext(struct pt_regs *regs, - struct sigcontext __user *sc, int *rval_p) -{ - unsigned int err = 0; - -#define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); } - COPY(r0); - COPY(r1); - COPY(r2); COPY(r3); COPY(r4); COPY(r5); - COPY(r6); COPY(r7); COPY(r8); COPY(r9); - COPY(r10); COPY(r11); COPY(r12); COPY(r13); - COPY(r14); COPY(r15); COPY(r16); COPY(r17); - COPY(r18); COPY(r19); COPY(r20); COPY(r21); - COPY(r22); COPY(r23); COPY(r24); COPY(r25); - COPY(r26); COPY(r27); COPY(r28); COPY(r29); - COPY(r30); COPY(r31); - COPY(pc); COPY(ear); COPY(esr); COPY(fsr); -#undef COPY - - *rval_p = regs->r3; - - return err; -} - -asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) -{ - struct rt_sigframe __user *frame = - (struct rt_sigframe __user *)(regs->r1); - - sigset_t set; - int rval; - - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - - if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) - goto badframe; - - sigdelsetmask(&set, ~_BLOCKABLE); - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval)) - goto badframe; - - /* It is more difficult to avoid calling this function than to - call it and ignore errors. */ - if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1)) - goto badframe; - - return rval; - -badframe: - force_sig(SIGSEGV, current); - return 0; -} - -/* - * Set up a signal frame. - */ - -static int -setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, - unsigned long mask) -{ - int err = 0; - -#define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); } - COPY(r0); - COPY(r1); - COPY(r2); COPY(r3); COPY(r4); COPY(r5); - COPY(r6); COPY(r7); COPY(r8); COPY(r9); - COPY(r10); COPY(r11); COPY(r12); COPY(r13); - COPY(r14); COPY(r15); COPY(r16); COPY(r17); - COPY(r18); COPY(r19); COPY(r20); COPY(r21); - COPY(r22); COPY(r23); COPY(r24); COPY(r25); - COPY(r26); COPY(r27); COPY(r28); COPY(r29); - COPY(r30); COPY(r31); - COPY(pc); COPY(ear); COPY(esr); COPY(fsr); -#undef COPY - - err |= __put_user(mask, &sc->oldmask); - - return err; -} - -/* - * Determine which stack to use.. - */ -static inline void __user * -get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) -{ - /* Default to using normal stack */ - unsigned long sp = regs->r1; - - if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp)) - sp = current->sas_ss_sp + current->sas_ss_size; - - return (void __user *)((sp - frame_size) & -8UL); -} - -static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, - sigset_t *set, struct pt_regs *regs) -{ - struct rt_sigframe __user *frame; - int err = 0; - int signal; - unsigned long address = 0; -#ifdef CONFIG_MMU - pmd_t *pmdp; - pte_t *ptep; -#endif - - frame = get_sigframe(ka, regs, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - signal = current_thread_info()->exec_domain - && current_thread_info()->exec_domain->signal_invmap - && sig < 32 - ? current_thread_info()->exec_domain->signal_invmap[sig] - : sig; - - if (info) - err |= copy_siginfo_to_user(&frame->info, info); - - /* 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->r1), - &frame->uc.uc_stack.ss_flags); - err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); - err |= setup_sigcontext(&frame->uc.uc_mcontext, - regs, set->sig[0]); - err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); - - /* Set up to return from userspace. If provided, use a stub - already in userspace. */ - /* minus 8 is offset to cater for "rtsd r15,8" */ - /* addi r12, r0, __NR_sigreturn */ - err |= __put_user(0x31800000 | __NR_rt_sigreturn , - frame->tramp + 0); - /* brki r14, 0x8 */ - err |= __put_user(0xb9cc0008, frame->tramp + 1); - - /* Return from sighandler will jump to the tramp. - Negative 8 offset because return is rtsd r15, 8 */ - regs->r15 = ((unsigned long)frame->tramp)-8; - - address = ((unsigned long)frame->tramp); -#ifdef CONFIG_MMU - pmdp = pmd_offset(pud_offset( - pgd_offset(current->mm, address), - address), address); - - preempt_disable(); - ptep = pte_offset_map(pmdp, address); - if (pte_present(*ptep)) { - address = (unsigned long) page_address(pte_page(*ptep)); - /* MS: I need add offset in page */ - address += ((unsigned long)frame->tramp) & ~PAGE_MASK; - /* MS address is virtual */ - address = virt_to_phys(address); - invalidate_icache_range(address, address + 8); - flush_dcache_range(address, address + 8); - } - pte_unmap(ptep); - preempt_enable(); -#else - flush_icache_range(address, address + 8); - flush_dcache_range(address, address + 8); -#endif - if (err) - goto give_sigsegv; - - /* Set up registers for signal handler */ - regs->r1 = (unsigned long) frame; - - /* Signal handler args: */ - regs->r5 = signal; /* arg 0: signum */ - regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */ - regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */ - /* Offset to handle microblaze rtid r14, 0 */ - regs->pc = (unsigned long)ka->sa.sa_handler; - - set_fs(USER_DS); - - /* the tracer may want to single-step inside the handler */ - if (test_thread_flag(TIF_SINGLESTEP)) - ptrace_notify(SIGTRAP); - -#ifdef DEBUG_SIG - printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n", - current->comm, current->pid, frame, regs->pc); -#endif - - return; - -give_sigsegv: - if (sig == SIGSEGV) - ka->sa.sa_handler = SIG_DFL; - force_sig(SIGSEGV, current); -} - -/* Handle restarting system calls */ -static inline void -handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) -{ - switch (regs->r3) { - case -ERESTART_RESTARTBLOCK: - case -ERESTARTNOHAND: - if (!has_handler) - goto do_restart; - regs->r3 = -EINTR; - break; - case -ERESTARTSYS: - if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { - regs->r3 = -EINTR; - break; - } - /* fallthrough */ - case -ERESTARTNOINTR: -do_restart: - /* offset of 4 bytes to re-execute trap (brki) instruction */ -#ifndef CONFIG_MMU - regs->pc -= 4; -#else - /* offset of 8 bytes required = 4 for rtbd - offset, plus 4 for size of - "brki r14,8" - instruction. */ - regs->pc -= 8; -#endif - break; - } -} - -/* - * OK, we're invoking a handler - */ - -static int -handle_signal(unsigned long sig, struct k_sigaction *ka, - siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) -{ - /* Set up the stack frame */ - if (ka->sa.sa_flags & SA_SIGINFO) - setup_rt_frame(sig, ka, info, oldset, regs); - else - setup_rt_frame(sig, ka, NULL, oldset, regs); - - if (ka->sa.sa_flags & SA_ONESHOT) - ka->sa.sa_handler = SIG_DFL; - - if (!(ka->sa.sa_flags & SA_NODEFER)) { - spin_lock_irq(¤t->sighand->siglock); - sigorsets(¤t->blocked, - ¤t->blocked, &ka->sa.sa_mask); - sigaddset(¤t->blocked, sig); - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - } - 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. - * - * 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. - */ -int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall) -{ - siginfo_t info; - int signr; - struct k_sigaction ka; -#ifdef DEBUG_SIG - printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall); - printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1, - regs->r12, current_thread_info()->flags); -#endif - /* - * 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 (kernel_mode(regs)) - return 1; - - if (current_thread_info()->status & TS_RESTORE_SIGMASK) - oldset = ¤t->saved_sigmask; - else - oldset = ¤t->blocked; - - signr = get_signal_to_deliver(&info, &ka, regs, NULL); - if (signr > 0) { - /* Whee! Actually deliver the signal. */ - if (in_syscall) - handle_restart(regs, &ka, 1); - if (handle_signal(signr, &ka, &info, oldset, regs)) { - /* - * 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 1; - } - - if (in_syscall) - handle_restart(regs, NULL, 0); - - /* - * 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); - } - - /* Did we come from a system call? */ - return 0; -} |