unicore32 core architecture: signals handling
This patch implements signals. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
This commit is contained in:
GuanXuetao
Родитель
752bcb4d02
Коммит
f864d2f830
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@ -0,0 +1,29 @@
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/*
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* linux/arch/unicore32/include/asm/sigcontext.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __UNICORE_SIGCONTEXT_H__
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#define __UNICORE_SIGCONTEXT_H__
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#include <asm/ptrace.h>
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/*
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* Signal context structure - contains all info to do with the state
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* before the signal handler was invoked. Note: only add new entries
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* to the end of the structure.
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*/
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struct sigcontext {
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unsigned long trap_no;
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unsigned long error_code;
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unsigned long oldmask;
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unsigned long fault_address;
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struct pt_regs regs;
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};
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#endif
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@ -0,0 +1,494 @@
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/*
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* linux/arch/unicore32/kernel/signal.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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 version 2 as
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* published by the Free Software Foundation.
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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/personality.h>
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#include <linux/freezer.h>
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#include <linux/uaccess.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/unistd.h>
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#include <asm/cacheflush.h>
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#include <asm/ucontext.h>
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/*
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* For UniCore syscalls, we encode the syscall number into the instruction.
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*/
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#define SWI_SYS_SIGRETURN (0xff000000) /* error number for new abi */
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#define SWI_SYS_RT_SIGRETURN (0xff000000 | (__NR_rt_sigreturn))
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#define SWI_SYS_RESTART (0xff000000 | (__NR_restart_syscall))
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#define KERN_SIGRETURN_CODE (KUSER_VECPAGE_BASE + 0x00000500)
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#define KERN_RESTART_CODE (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
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const unsigned long sigreturn_codes[3] = {
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SWI_SYS_SIGRETURN, SWI_SYS_RT_SIGRETURN,
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};
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const unsigned long syscall_restart_code[2] = {
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SWI_SYS_RESTART, /* swi __NR_restart_syscall */
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0x69efc004, /* ldr pc, [sp], #4 */
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};
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/*
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* Do a signal return; undo the signal stack. These are aligned to 64-bit.
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*/
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struct sigframe {
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struct ucontext uc;
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unsigned long retcode[2];
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};
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struct rt_sigframe {
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struct siginfo info;
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struct sigframe sig;
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};
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static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
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{
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sigset_t set;
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int err;
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err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
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if (err == 0) {
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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err |= __get_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
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err |= __get_user(regs->UCreg_01, &sf->uc.uc_mcontext.regs.UCreg_01);
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err |= __get_user(regs->UCreg_02, &sf->uc.uc_mcontext.regs.UCreg_02);
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err |= __get_user(regs->UCreg_03, &sf->uc.uc_mcontext.regs.UCreg_03);
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err |= __get_user(regs->UCreg_04, &sf->uc.uc_mcontext.regs.UCreg_04);
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err |= __get_user(regs->UCreg_05, &sf->uc.uc_mcontext.regs.UCreg_05);
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err |= __get_user(regs->UCreg_06, &sf->uc.uc_mcontext.regs.UCreg_06);
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err |= __get_user(regs->UCreg_07, &sf->uc.uc_mcontext.regs.UCreg_07);
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err |= __get_user(regs->UCreg_08, &sf->uc.uc_mcontext.regs.UCreg_08);
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err |= __get_user(regs->UCreg_09, &sf->uc.uc_mcontext.regs.UCreg_09);
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err |= __get_user(regs->UCreg_10, &sf->uc.uc_mcontext.regs.UCreg_10);
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err |= __get_user(regs->UCreg_11, &sf->uc.uc_mcontext.regs.UCreg_11);
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err |= __get_user(regs->UCreg_12, &sf->uc.uc_mcontext.regs.UCreg_12);
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err |= __get_user(regs->UCreg_13, &sf->uc.uc_mcontext.regs.UCreg_13);
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err |= __get_user(regs->UCreg_14, &sf->uc.uc_mcontext.regs.UCreg_14);
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err |= __get_user(regs->UCreg_15, &sf->uc.uc_mcontext.regs.UCreg_15);
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err |= __get_user(regs->UCreg_16, &sf->uc.uc_mcontext.regs.UCreg_16);
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err |= __get_user(regs->UCreg_17, &sf->uc.uc_mcontext.regs.UCreg_17);
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err |= __get_user(regs->UCreg_18, &sf->uc.uc_mcontext.regs.UCreg_18);
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err |= __get_user(regs->UCreg_19, &sf->uc.uc_mcontext.regs.UCreg_19);
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err |= __get_user(regs->UCreg_20, &sf->uc.uc_mcontext.regs.UCreg_20);
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err |= __get_user(regs->UCreg_21, &sf->uc.uc_mcontext.regs.UCreg_21);
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err |= __get_user(regs->UCreg_22, &sf->uc.uc_mcontext.regs.UCreg_22);
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err |= __get_user(regs->UCreg_23, &sf->uc.uc_mcontext.regs.UCreg_23);
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err |= __get_user(regs->UCreg_24, &sf->uc.uc_mcontext.regs.UCreg_24);
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err |= __get_user(regs->UCreg_25, &sf->uc.uc_mcontext.regs.UCreg_25);
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err |= __get_user(regs->UCreg_26, &sf->uc.uc_mcontext.regs.UCreg_26);
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err |= __get_user(regs->UCreg_fp, &sf->uc.uc_mcontext.regs.UCreg_fp);
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err |= __get_user(regs->UCreg_ip, &sf->uc.uc_mcontext.regs.UCreg_ip);
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err |= __get_user(regs->UCreg_sp, &sf->uc.uc_mcontext.regs.UCreg_sp);
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err |= __get_user(regs->UCreg_lr, &sf->uc.uc_mcontext.regs.UCreg_lr);
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err |= __get_user(regs->UCreg_pc, &sf->uc.uc_mcontext.regs.UCreg_pc);
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err |= __get_user(regs->UCreg_asr, &sf->uc.uc_mcontext.regs.UCreg_asr);
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err |= !valid_user_regs(regs);
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return err;
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}
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asmlinkage int __sys_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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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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/*
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* Since we stacked the signal on a 64-bit boundary,
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* then 'sp' should be word aligned here. If it's
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* not, then the user is trying to mess with us.
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*/
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if (regs->UCreg_sp & 7)
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goto badframe;
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frame = (struct rt_sigframe __user *)regs->UCreg_sp;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (restore_sigframe(regs, &frame->sig))
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goto badframe;
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if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->UCreg_sp)
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== -EFAULT)
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goto badframe;
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return regs->UCreg_00;
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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_sigframe(struct sigframe __user *sf, struct pt_regs *regs,
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sigset_t *set)
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{
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int err = 0;
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err |= __put_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
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err |= __put_user(regs->UCreg_01, &sf->uc.uc_mcontext.regs.UCreg_01);
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err |= __put_user(regs->UCreg_02, &sf->uc.uc_mcontext.regs.UCreg_02);
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err |= __put_user(regs->UCreg_03, &sf->uc.uc_mcontext.regs.UCreg_03);
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err |= __put_user(regs->UCreg_04, &sf->uc.uc_mcontext.regs.UCreg_04);
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err |= __put_user(regs->UCreg_05, &sf->uc.uc_mcontext.regs.UCreg_05);
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err |= __put_user(regs->UCreg_06, &sf->uc.uc_mcontext.regs.UCreg_06);
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err |= __put_user(regs->UCreg_07, &sf->uc.uc_mcontext.regs.UCreg_07);
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err |= __put_user(regs->UCreg_08, &sf->uc.uc_mcontext.regs.UCreg_08);
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err |= __put_user(regs->UCreg_09, &sf->uc.uc_mcontext.regs.UCreg_09);
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err |= __put_user(regs->UCreg_10, &sf->uc.uc_mcontext.regs.UCreg_10);
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err |= __put_user(regs->UCreg_11, &sf->uc.uc_mcontext.regs.UCreg_11);
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err |= __put_user(regs->UCreg_12, &sf->uc.uc_mcontext.regs.UCreg_12);
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err |= __put_user(regs->UCreg_13, &sf->uc.uc_mcontext.regs.UCreg_13);
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err |= __put_user(regs->UCreg_14, &sf->uc.uc_mcontext.regs.UCreg_14);
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err |= __put_user(regs->UCreg_15, &sf->uc.uc_mcontext.regs.UCreg_15);
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err |= __put_user(regs->UCreg_16, &sf->uc.uc_mcontext.regs.UCreg_16);
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err |= __put_user(regs->UCreg_17, &sf->uc.uc_mcontext.regs.UCreg_17);
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err |= __put_user(regs->UCreg_18, &sf->uc.uc_mcontext.regs.UCreg_18);
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err |= __put_user(regs->UCreg_19, &sf->uc.uc_mcontext.regs.UCreg_19);
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err |= __put_user(regs->UCreg_20, &sf->uc.uc_mcontext.regs.UCreg_20);
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err |= __put_user(regs->UCreg_21, &sf->uc.uc_mcontext.regs.UCreg_21);
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err |= __put_user(regs->UCreg_22, &sf->uc.uc_mcontext.regs.UCreg_22);
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err |= __put_user(regs->UCreg_23, &sf->uc.uc_mcontext.regs.UCreg_23);
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err |= __put_user(regs->UCreg_24, &sf->uc.uc_mcontext.regs.UCreg_24);
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err |= __put_user(regs->UCreg_25, &sf->uc.uc_mcontext.regs.UCreg_25);
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err |= __put_user(regs->UCreg_26, &sf->uc.uc_mcontext.regs.UCreg_26);
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err |= __put_user(regs->UCreg_fp, &sf->uc.uc_mcontext.regs.UCreg_fp);
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err |= __put_user(regs->UCreg_ip, &sf->uc.uc_mcontext.regs.UCreg_ip);
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err |= __put_user(regs->UCreg_sp, &sf->uc.uc_mcontext.regs.UCreg_sp);
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err |= __put_user(regs->UCreg_lr, &sf->uc.uc_mcontext.regs.UCreg_lr);
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err |= __put_user(regs->UCreg_pc, &sf->uc.uc_mcontext.regs.UCreg_pc);
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err |= __put_user(regs->UCreg_asr, &sf->uc.uc_mcontext.regs.UCreg_asr);
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err |= __put_user(current->thread.trap_no,
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&sf->uc.uc_mcontext.trap_no);
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err |= __put_user(current->thread.error_code,
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&sf->uc.uc_mcontext.error_code);
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err |= __put_user(current->thread.address,
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&sf->uc.uc_mcontext.fault_address);
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err |= __put_user(set->sig[0], &sf->uc.uc_mcontext.oldmask);
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err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
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return err;
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}
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static inline void __user *get_sigframe(struct k_sigaction *ka,
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struct pt_regs *regs, int framesize)
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{
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unsigned long sp = regs->UCreg_sp;
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void __user *frame;
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/*
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* This is the X/Open sanctioned signal stack switching.
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*/
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if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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/*
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* ATPCS B01 mandates 8-byte alignment
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*/
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frame = (void __user *)((sp - framesize) & ~7);
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/*
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* Check that we can actually write to the signal frame.
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*/
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if (!access_ok(VERIFY_WRITE, frame, framesize))
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frame = NULL;
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return frame;
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}
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static int setup_return(struct pt_regs *regs, struct k_sigaction *ka,
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unsigned long __user *rc, void __user *frame, int usig)
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{
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unsigned long handler = (unsigned long)ka->sa.sa_handler;
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unsigned long retcode;
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unsigned long asr = regs->UCreg_asr & ~PSR_f;
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unsigned int idx = 0;
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if (ka->sa.sa_flags & SA_SIGINFO)
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idx += 1;
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if (__put_user(sigreturn_codes[idx], rc) ||
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__put_user(sigreturn_codes[idx+1], rc+1))
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return 1;
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retcode = KERN_SIGRETURN_CODE + (idx << 2);
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regs->UCreg_00 = usig;
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regs->UCreg_sp = (unsigned long)frame;
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regs->UCreg_lr = retcode;
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regs->UCreg_pc = handler;
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regs->UCreg_asr = asr;
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return 0;
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}
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static int setup_frame(int usig, struct k_sigaction *ka,
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sigset_t *set, struct pt_regs *regs)
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{
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struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
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int err = 0;
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if (!frame)
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return 1;
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/*
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* Set uc.uc_flags to a value which sc.trap_no would never have.
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*/
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err |= __put_user(0x5ac3c35a, &frame->uc.uc_flags);
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err |= setup_sigframe(frame, regs, set);
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if (err == 0)
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err |= setup_return(regs, ka, frame->retcode, frame, usig);
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return err;
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}
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static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame =
|
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get_sigframe(ka, regs, sizeof(*frame));
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stack_t stack;
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int err = 0;
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|
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if (!frame)
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return 1;
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err |= copy_siginfo_to_user(&frame->info, info);
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err |= __put_user(0, &frame->sig.uc.uc_flags);
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err |= __put_user(NULL, &frame->sig.uc.uc_link);
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memset(&stack, 0, sizeof(stack));
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stack.ss_sp = (void __user *)current->sas_ss_sp;
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stack.ss_flags = sas_ss_flags(regs->UCreg_sp);
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stack.ss_size = current->sas_ss_size;
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err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
|
||||
|
||||
err |= setup_sigframe(&frame->sig, regs, set);
|
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if (err == 0)
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err |= setup_return(regs, ka, frame->sig.retcode, frame, usig);
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||||
|
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if (err == 0) {
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/*
|
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* For realtime signals we must also set the second and third
|
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* arguments for the signal handler.
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*/
|
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regs->UCreg_01 = (unsigned long)&frame->info;
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regs->UCreg_02 = (unsigned long)&frame->sig.uc;
|
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}
|
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|
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return err;
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}
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||||
|
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static inline void setup_syscall_restart(struct pt_regs *regs)
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{
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regs->UCreg_00 = regs->UCreg_ORIG_00;
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regs->UCreg_pc -= 4;
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}
|
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|
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/*
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* OK, we're invoking a handler
|
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*/
|
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static int handle_signal(unsigned long sig, struct k_sigaction *ka,
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siginfo_t *info, sigset_t *oldset,
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struct pt_regs *regs, int syscall)
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{
|
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struct thread_info *thread = current_thread_info();
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struct task_struct *tsk = current;
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int usig = sig;
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int ret;
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|
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/*
|
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* If we were from a system call, check for system call restarting...
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*/
|
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if (syscall) {
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switch (regs->UCreg_00) {
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case -ERESTART_RESTARTBLOCK:
|
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case -ERESTARTNOHAND:
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regs->UCreg_00 = -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->UCreg_00 = -EINTR;
|
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break;
|
||||
}
|
||||
/* fallthrough */
|
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case -ERESTARTNOINTR:
|
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setup_syscall_restart(regs);
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}
|
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}
|
||||
|
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/*
|
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* translate the signal
|
||||
*/
|
||||
if (usig < 32 && thread->exec_domain
|
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&& thread->exec_domain->signal_invmap)
|
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usig = thread->exec_domain->signal_invmap[usig];
|
||||
|
||||
/*
|
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* Set up the stack frame
|
||||
*/
|
||||
if (ka->sa.sa_flags & SA_SIGINFO)
|
||||
ret = setup_rt_frame(usig, ka, info, oldset, regs);
|
||||
else
|
||||
ret = setup_frame(usig, ka, oldset, regs);
|
||||
|
||||
/*
|
||||
* Check that the resulting registers are actually sane.
|
||||
*/
|
||||
ret |= !valid_user_regs(regs);
|
||||
|
||||
if (ret != 0) {
|
||||
force_sigsegv(sig, tsk);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Block the signal if we were successful.
|
||||
*/
|
||||
spin_lock_irq(&tsk->sighand->siglock);
|
||||
sigorsets(&tsk->blocked, &tsk->blocked,
|
||||
&ka->sa.sa_mask);
|
||||
if (!(ka->sa.sa_flags & SA_NODEFER))
|
||||
sigaddset(&tsk->blocked, sig);
|
||||
recalc_sigpending();
|
||||
spin_unlock_irq(&tsk->sighand->siglock);
|
||||
|
||||
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.
|
||||
*/
|
||||
static void do_signal(struct pt_regs *regs, int syscall)
|
||||
{
|
||||
struct k_sigaction ka;
|
||||
siginfo_t info;
|
||||
int signr;
|
||||
|
||||
/*
|
||||
* 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 (try_to_freeze())
|
||||
goto no_signal;
|
||||
|
||||
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
||||
if (signr > 0) {
|
||||
sigset_t *oldset;
|
||||
|
||||
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
||||
oldset = ¤t->saved_sigmask;
|
||||
else
|
||||
oldset = ¤t->blocked;
|
||||
if (handle_signal(signr, &ka, &info, oldset, regs, syscall)
|
||||
== 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);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
no_signal:
|
||||
/*
|
||||
* No signal to deliver to the process - restart the syscall.
|
||||
*/
|
||||
if (syscall) {
|
||||
if (regs->UCreg_00 == -ERESTART_RESTARTBLOCK) {
|
||||
u32 __user *usp;
|
||||
|
||||
regs->UCreg_sp -= 4;
|
||||
usp = (u32 __user *)regs->UCreg_sp;
|
||||
|
||||
if (put_user(regs->UCreg_pc, usp) == 0) {
|
||||
regs->UCreg_pc = KERN_RESTART_CODE;
|
||||
} else {
|
||||
regs->UCreg_sp += 4;
|
||||
force_sigsegv(0, current);
|
||||
}
|
||||
}
|
||||
if (regs->UCreg_00 == -ERESTARTNOHAND ||
|
||||
regs->UCreg_00 == -ERESTARTSYS ||
|
||||
regs->UCreg_00 == -ERESTARTNOINTR) {
|
||||
setup_syscall_restart(regs);
|
||||
}
|
||||
|
||||
/* 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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
asmlinkage void do_notify_resume(struct pt_regs *regs,
|
||||
unsigned int thread_flags, int syscall)
|
||||
{
|
||||
if (thread_flags & _TIF_SIGPENDING)
|
||||
do_signal(regs, syscall);
|
||||
|
||||
if (thread_flags & _TIF_NOTIFY_RESUME) {
|
||||
clear_thread_flag(TIF_NOTIFY_RESUME);
|
||||
tracehook_notify_resume(regs);
|
||||
if (current->replacement_session_keyring)
|
||||
key_replace_session_keyring();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Copy signal return handlers into the vector page, and
|
||||
* set sigreturn to be a pointer to these.
|
||||
*/
|
||||
void __init early_signal_init(void)
|
||||
{
|
||||
memcpy((void *)kuser_vecpage_to_vectors(KERN_SIGRETURN_CODE),
|
||||
sigreturn_codes, sizeof(sigreturn_codes));
|
||||
memcpy((void *)kuser_vecpage_to_vectors(KERN_RESTART_CODE),
|
||||
syscall_restart_code, sizeof(syscall_restart_code));
|
||||
/* Need not to flush icache, since early_trap_init will do it last. */
|
||||
}
|
||||
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