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linux
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signal.c
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/* * Copyright (C) 2013-2014 Altera Corporation * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd * Copyright (C) 1991, 1992 Linus Torvalds * * 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/signal.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/uaccess.h> #include <linux/unistd.h> #include <linux/personality.h> #include <linux/tracehook.h> #include <asm/ucontext.h> #include <asm/cacheflush.h> #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* * Do a signal return; undo the signal stack. * * Keep the return code on the stack quadword aligned! * That makes the cache flush below easier. */ struct rt_sigframe { struct siginfo info; struct ucontext uc; }; static inline int rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, struct ucontext *uc, int *pr2) { int temp; unsigned long *gregs = uc->uc_mcontext.gregs; int err; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; err = __get_user(temp, &uc->uc_mcontext.version); if (temp != MCONTEXT_VERSION) goto badframe; /* restore passed registers */ err |= __get_user(regs->r1, &gregs[0]); err |= __get_user(regs->r2, &gregs[1]); err |= __get_user(regs->r3, &gregs[2]); err |= __get_user(regs->r4, &gregs[3]); err |= __get_user(regs->r5, &gregs[4]); err |= __get_user(regs->r6, &gregs[5]); err |= __get_user(regs->r7, &gregs[6]); err |= __get_user(regs->r8, &gregs[7]); err |= __get_user(regs->r9, &gregs[8]); err |= __get_user(regs->r10, &gregs[9]); err |= __get_user(regs->r11, &gregs[10]); err |= __get_user(regs->r12, &gregs[11]); err |= __get_user(regs->r13, &gregs[12]); err |= __get_user(regs->r14, &gregs[13]); err |= __get_user(regs->r15, &gregs[14]); err |= __get_user(sw->r16, &gregs[15]); err |= __get_user(sw->r17, &gregs[16]); err |= __get_user(sw->r18, &gregs[17]); err |= __get_user(sw->r19, &gregs[18]); err |= __get_user(sw->r20, &gregs[19]); err |= __get_user(sw->r21, &gregs[20]); err |= __get_user(sw->r22, &gregs[21]); err |= __get_user(sw->r23, &gregs[22]); /* gregs[23] is handled below */ err |= __get_user(sw->fp, &gregs[24]); /* Verify, should this be settable */ err |= __get_user(sw->gp, &gregs[25]); /* Verify, should this be settable */ err |= __get_user(temp, &gregs[26]); /* Not really necessary no user settable bits */ err |= __get_user(regs->ea, &gregs[27]); err |= __get_user(regs->ra, &gregs[23]); err |= __get_user(regs->sp, &gregs[28]); regs->orig_r2 = -1; /* disable syscall checks */ err |= restore_altstack(&uc->uc_stack); if (err) goto badframe; *pr2 = regs->r2; return err; badframe: return 1; } asmlinkage int do_rt_sigreturn(struct switch_stack *sw) { struct pt_regs *regs = (struct pt_regs *)(sw + 1); /* Verify, can we follow the stack back */ struct rt_sigframe *frame = (struct rt_sigframe *) regs->sp; 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; set_current_blocked(&set); if (rt_restore_ucontext(regs, sw, &frame->uc, &rval)) goto badframe; return rval; badframe: force_sig(SIGSEGV, current); return 0; } static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs) { struct switch_stack *sw = (struct switch_stack *)regs - 1; unsigned long *gregs = uc->uc_mcontext.gregs; int err = 0; err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); err |= __put_user(regs->r1, &gregs[0]); err |= __put_user(regs->r2, &gregs[1]); err |= __put_user(regs->r3, &gregs[2]); err |= __put_user(regs->r4, &gregs[3]); err |= __put_user(regs->r5, &gregs[4]); err |= __put_user(regs->r6, &gregs[5]); err |= __put_user(regs->r7, &gregs[6]); err |= __put_user(regs->r8, &gregs[7]); err |= __put_user(regs->r9, &gregs[8]); err |= __put_user(regs->r10, &gregs[9]); err |= __put_user(regs->r11, &gregs[10]); err |= __put_user(regs->r12, &gregs[11]); err |= __put_user(regs->r13, &gregs[12]); err |= __put_user(regs->r14, &gregs[13]); err |= __put_user(regs->r15, &gregs[14]); err |= __put_user(sw->r16, &gregs[15]); err |= __put_user(sw->r17, &gregs[16]); err |= __put_user(sw->r18, &gregs[17]); err |= __put_user(sw->r19, &gregs[18]); err |= __put_user(sw->r20, &gregs[19]); err |= __put_user(sw->r21, &gregs[20]); err |= __put_user(sw->r22, &gregs[21]); err |= __put_user(sw->r23, &gregs[22]); err |= __put_user(regs->ra, &gregs[23]); err |= __put_user(sw->fp, &gregs[24]); err |= __put_user(sw->gp, &gregs[25]); err |= __put_user(regs->ea, &gregs[27]); err |= __put_user(regs->sp, &gregs[28]); return err; } static inline void *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size) { unsigned long usp; /* Default to using normal stack. */ usp = regs->sp; /* This is the X/Open sanctioned signal stack switching. */ usp = sigsp(usp, ksig); /* Verify, is it 32 or 64 bit aligned */ return (void *)((usp - frame_size) & -8UL); } static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { struct rt_sigframe *frame; int err = 0; frame = get_sigframe(ksig, regs, sizeof(*frame)); if (ksig->ka.sa.sa_flags & SA_SIGINFO) err |= copy_siginfo_to_user(&frame->info, &ksig->info); /* Create the ucontext. */ err |= __put_user(0, &frame->uc.uc_flags); err |= __put_user(0, &frame->uc.uc_link); err |= __save_altstack(&frame->uc.uc_stack, regs->sp); err |= rt_setup_ucontext(&frame->uc, regs); err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) goto give_sigsegv; /* Set up to return from userspace; jump to fixed address sigreturn trampoline on kuser page. */ regs->ra = (unsigned long) (0x1044); /* Set up registers for signal handler */ regs->sp = (unsigned long) frame; regs->r4 = (unsigned long) ksig->sig; regs->r5 = (unsigned long) &frame->info; regs->r6 = (unsigned long) &frame->uc; regs->ea = (unsigned long) ksig->ka.sa.sa_handler; return 0; give_sigsegv: force_sigsegv(ksig->sig, current); return -EFAULT; } /* * OK, we're invoking a handler */ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) { int ret; sigset_t *oldset = sigmask_to_save(); /* set up the stack frame */ ret = setup_rt_frame(ksig, oldset, regs); signal_setup_done(ret, ksig, 0); } static int do_signal(struct pt_regs *regs) { unsigned int retval = 0, continue_addr = 0, restart_addr = 0; int restart = 0; struct ksignal ksig; current->thread.kregs = regs; /* * If we were from a system call, check for system call restarting... */ if (regs->orig_r2 >= 0) { continue_addr = regs->ea; restart_addr = continue_addr - 4; retval = regs->r2; /* * Prepare for system call restart. We do this here so that a * debugger will see the already changed PC. */ switch (retval) { case ERESTART_RESTARTBLOCK: restart = -2; case ERESTARTNOHAND: case ERESTARTSYS: case ERESTARTNOINTR: restart++; regs->r2 = regs->orig_r2; regs->r7 = regs->orig_r7; regs->ea = restart_addr; break; } } if (get_signal(&ksig)) { /* handler */ if (unlikely(restart && regs->ea == restart_addr)) { if (retval == ERESTARTNOHAND || retval == ERESTART_RESTARTBLOCK || (retval == ERESTARTSYS && !(ksig.ka.sa.sa_flags & SA_RESTART))) { regs->r2 = EINTR; regs->r7 = 1; regs->ea = continue_addr; } } handle_signal(&ksig, regs); return 0; } /* * No handler present */ if (unlikely(restart) && regs->ea == restart_addr) { regs->ea = continue_addr; regs->r2 = __NR_restart_syscall; } /* * If there's no signal to deliver, we just put the saved sigmask back. */ restore_saved_sigmask(); return restart; } asmlinkage int do_notify_resume(struct pt_regs *regs) { /* * 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 0; if (test_thread_flag(TIF_SIGPENDING)) { int restart = do_signal(regs); if (unlikely(restart)) { /* * Restart without handlers. * Deal with it without leaving * the kernel space. */ return restart; } } else if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) tracehook_notify_resume(regs); return 0; }
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