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- /*
- * Copyright (C) 2012 Regents of the University of California
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/sched/debug.h>
- #include <linux/sched/signal.h>
- #include <linux/signal.h>
- #include <linux/kdebug.h>
- #include <linux/uaccess.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/irq.h>
- #include <asm/processor.h>
- #include <asm/ptrace.h>
- #include <asm/csr.h>
- int show_unhandled_signals = 1;
- extern asmlinkage void handle_exception(void);
- static DEFINE_SPINLOCK(die_lock);
- void die(struct pt_regs *regs, const char *str)
- {
- static int die_counter;
- int ret;
- oops_enter();
- spin_lock_irq(&die_lock);
- console_verbose();
- bust_spinlocks(1);
- pr_emerg("%s [#%d]\n", str, ++die_counter);
- print_modules();
- show_regs(regs);
- ret = notify_die(DIE_OOPS, str, regs, 0, regs->scause, SIGSEGV);
- bust_spinlocks(0);
- add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
- spin_unlock_irq(&die_lock);
- oops_exit();
- if (in_interrupt())
- panic("Fatal exception in interrupt");
- if (panic_on_oops)
- panic("Fatal exception");
- if (ret != NOTIFY_STOP)
- do_exit(SIGSEGV);
- }
- void do_trap(struct pt_regs *regs, int signo, int code,
- unsigned long addr, struct task_struct *tsk)
- {
- if (show_unhandled_signals && unhandled_signal(tsk, signo)
- && printk_ratelimit()) {
- pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x" REG_FMT,
- tsk->comm, task_pid_nr(tsk), signo, code, addr);
- print_vma_addr(KERN_CONT " in ", GET_IP(regs));
- pr_cont("\n");
- show_regs(regs);
- }
- force_sig_fault(signo, code, (void __user *)addr, tsk);
- }
- static void do_trap_error(struct pt_regs *regs, int signo, int code,
- unsigned long addr, const char *str)
- {
- if (user_mode(regs)) {
- do_trap(regs, signo, code, addr, current);
- } else {
- if (!fixup_exception(regs))
- die(regs, str);
- }
- }
- #define DO_ERROR_INFO(name, signo, code, str) \
- asmlinkage void name(struct pt_regs *regs) \
- { \
- do_trap_error(regs, signo, code, regs->sepc, "Oops - " str); \
- }
- DO_ERROR_INFO(do_trap_unknown,
- SIGILL, ILL_ILLTRP, "unknown exception");
- DO_ERROR_INFO(do_trap_insn_misaligned,
- SIGBUS, BUS_ADRALN, "instruction address misaligned");
- DO_ERROR_INFO(do_trap_insn_fault,
- SIGSEGV, SEGV_ACCERR, "instruction access fault");
- DO_ERROR_INFO(do_trap_insn_illegal,
- SIGILL, ILL_ILLOPC, "illegal instruction");
- DO_ERROR_INFO(do_trap_load_misaligned,
- SIGBUS, BUS_ADRALN, "load address misaligned");
- DO_ERROR_INFO(do_trap_load_fault,
- SIGSEGV, SEGV_ACCERR, "load access fault");
- DO_ERROR_INFO(do_trap_store_misaligned,
- SIGBUS, BUS_ADRALN, "store (or AMO) address misaligned");
- DO_ERROR_INFO(do_trap_store_fault,
- SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault");
- DO_ERROR_INFO(do_trap_ecall_u,
- SIGILL, ILL_ILLTRP, "environment call from U-mode");
- DO_ERROR_INFO(do_trap_ecall_s,
- SIGILL, ILL_ILLTRP, "environment call from S-mode");
- DO_ERROR_INFO(do_trap_ecall_m,
- SIGILL, ILL_ILLTRP, "environment call from M-mode");
- asmlinkage void do_trap_break(struct pt_regs *regs)
- {
- #ifdef CONFIG_GENERIC_BUG
- if (!user_mode(regs)) {
- enum bug_trap_type type;
- type = report_bug(regs->sepc, regs);
- switch (type) {
- case BUG_TRAP_TYPE_NONE:
- break;
- case BUG_TRAP_TYPE_WARN:
- regs->sepc += sizeof(bug_insn_t);
- return;
- case BUG_TRAP_TYPE_BUG:
- die(regs, "Kernel BUG");
- }
- }
- #endif /* CONFIG_GENERIC_BUG */
- force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc), current);
- }
- #ifdef CONFIG_GENERIC_BUG
- int is_valid_bugaddr(unsigned long pc)
- {
- bug_insn_t insn;
- if (pc < PAGE_OFFSET)
- return 0;
- if (probe_kernel_address((bug_insn_t *)pc, insn))
- return 0;
- return (insn == __BUG_INSN);
- }
- #endif /* CONFIG_GENERIC_BUG */
- void __init trap_init(void)
- {
- /*
- * Set sup0 scratch register to 0, indicating to exception vector
- * that we are presently executing in the kernel
- */
- csr_write(sscratch, 0);
- /* Set the exception vector address */
- csr_write(stvec, &handle_exception);
- /* Enable all interrupts */
- csr_write(sie, -1);
- }
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