315 lines
8.5 KiB
C
315 lines
8.5 KiB
C
/*
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* arch/score/kernel/signal.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/uaccess.h>
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#include <linux/tracehook.h>
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#include <asm/cacheflush.h>
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#include <asm/syscalls.h>
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#include <asm/ucontext.h>
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struct rt_sigframe {
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u32 rs_ass[4]; /* argument save space */
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u32 rs_code[2]; /* signal trampoline */
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struct siginfo rs_info;
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struct ucontext rs_uc;
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};
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static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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int err = 0;
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unsigned long reg;
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reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc);
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err |= __put_user(regs->cp0_psr, &sc->sc_psr);
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err |= __put_user(regs->cp0_condition, &sc->sc_condition);
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#define save_gp_reg(i) { \
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reg = regs->regs[i]; \
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err |= __put_user(reg, &sc->sc_regs[i]); \
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} while (0)
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save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
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save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
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save_gp_reg(6); save_gp_reg(7); save_gp_reg(8);
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save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
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save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
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save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
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save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
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save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
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save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
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save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
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#undef save_gp_reg
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reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh);
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reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel);
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err |= __put_user(regs->cp0_ecr, &sc->sc_ecr);
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err |= __put_user(regs->cp0_ema, &sc->sc_ema);
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return err;
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}
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static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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int err = 0;
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u32 reg;
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err |= __get_user(regs->cp0_epc, &sc->sc_pc);
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err |= __get_user(regs->cp0_condition, &sc->sc_condition);
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err |= __get_user(reg, &sc->sc_mdceh);
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regs->ceh = (int) reg;
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err |= __get_user(reg, &sc->sc_mdcel);
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regs->cel = (int) reg;
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err |= __get_user(reg, &sc->sc_psr);
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regs->cp0_psr = (int) reg;
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err |= __get_user(reg, &sc->sc_ecr);
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regs->cp0_ecr = (int) reg;
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err |= __get_user(reg, &sc->sc_ema);
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regs->cp0_ema = (int) reg;
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#define restore_gp_reg(i) do { \
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err |= __get_user(reg, &sc->sc_regs[i]); \
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regs->regs[i] = reg; \
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} while (0)
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restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
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restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
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restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
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restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
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restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
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restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
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restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20);
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restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
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restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
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restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
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#undef restore_gp_reg
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return err;
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}
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/*
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* Determine which stack to use..
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*/
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static void __user *get_sigframe(struct k_sigaction *ka,
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struct pt_regs *regs, size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = regs->regs[0];
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sp -= 32;
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/* This is the X/Open sanctioned signal stack switching. */
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if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp)))
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sp = current->sas_ss_sp + current->sas_ss_size;
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return (void __user*)((sp - frame_size) & ~7);
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}
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asmlinkage long
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score_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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sigset_t set;
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int sig;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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frame = (struct rt_sigframe __user *) regs->regs[0];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
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goto badframe;
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set_current_blocked(&set);
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sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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if (restore_altstack(&frame->rs_uc.uc_stack))
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goto badframe;
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regs->is_syscall = 0;
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__asm__ __volatile__(
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"mv\tr0, %0\n\t"
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"la\tr8, syscall_exit\n\t"
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"br\tr8\n\t"
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: : "r" (regs) : "r8");
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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static int setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
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int signr, sigset_t *set, siginfo_t *info)
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{
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struct rt_sigframe __user *frame;
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int err = 0;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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/*
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* Set up the return code ...
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*
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* li v0, __NR_rt_sigreturn
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* syscall
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*/
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err |= __put_user(0x87788000 + __NR_rt_sigreturn*2,
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frame->rs_code + 0);
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err |= __put_user(0x80008002, frame->rs_code + 1);
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flush_cache_sigtramp((unsigned long) frame->rs_code);
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err |= copy_siginfo_to_user(&frame->rs_info, info);
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err |= __put_user(0, &frame->rs_uc.uc_flags);
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err |= __put_user(NULL, &frame->rs_uc.uc_link);
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err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]);
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err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
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err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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regs->regs[0] = (unsigned long) frame;
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regs->regs[3] = (unsigned long) frame->rs_code;
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regs->regs[4] = signr;
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regs->regs[5] = (unsigned long) &frame->rs_info;
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regs->regs[6] = (unsigned long) &frame->rs_uc;
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regs->regs[29] = (unsigned long) ka->sa.sa_handler;
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regs->cp0_epc = (unsigned long) ka->sa.sa_handler;
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return 0;
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give_sigsegv:
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force_sigsegv(signr, current);
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return -EFAULT;
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}
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static void handle_signal(unsigned long sig, siginfo_t *info,
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struct k_sigaction *ka, struct pt_regs *regs)
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{
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if (regs->is_syscall) {
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switch (regs->regs[4]) {
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case ERESTART_RESTARTBLOCK:
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case ERESTARTNOHAND:
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regs->regs[4] = EINTR;
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break;
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case ERESTARTSYS:
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if (!(ka->sa.sa_flags & SA_RESTART)) {
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regs->regs[4] = EINTR;
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break;
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}
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case ERESTARTNOINTR:
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regs->regs[4] = regs->orig_r4;
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regs->regs[7] = regs->orig_r7;
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regs->cp0_epc -= 8;
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}
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regs->is_syscall = 0;
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}
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/*
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* Set up the stack frame
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*/
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if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0)
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return;
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signal_delivered(sig, info, ka, regs, 0);
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}
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static void do_signal(struct pt_regs *regs)
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{
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struct k_sigaction ka;
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siginfo_t info;
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int signr;
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/*
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* We want the common case to go fast, which is why we may in certain
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* cases get here from kernel mode. Just return without doing anything
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* if so.
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*/
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if (!user_mode(regs))
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return;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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if (signr > 0) {
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/* Actually deliver the signal. */
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handle_signal(signr, &info, &ka, regs);
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return;
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}
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if (regs->is_syscall) {
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if (regs->regs[4] == ERESTARTNOHAND ||
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regs->regs[4] == ERESTARTSYS ||
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regs->regs[4] == ERESTARTNOINTR) {
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regs->regs[4] = regs->orig_r4;
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regs->regs[7] = regs->orig_r7;
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regs->cp0_epc -= 8;
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}
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if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
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regs->regs[27] = __NR_restart_syscall;
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regs->regs[4] = regs->orig_r4;
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regs->regs[7] = regs->orig_r7;
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regs->cp0_epc -= 8;
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}
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regs->is_syscall = 0; /* Don't deal with this again. */
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}
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/*
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* If there's no signal to deliver, we just put the saved sigmask
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* back
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*/
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restore_saved_sigmask();
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}
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/*
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* notification of userspace execution resumption
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* - triggered by the TIF_WORK_MASK flags
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*/
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asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
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__u32 thread_info_flags)
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{
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/* deal with pending signal delivery */
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if (thread_info_flags & _TIF_SIGPENDING)
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do_signal(regs);
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if (thread_info_flags & _TIF_NOTIFY_RESUME) {
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clear_thread_flag(TIF_NOTIFY_RESUME);
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tracehook_notify_resume(regs);
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}
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}
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