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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2012 Regents of the University of California
- */
- #include <linux/cpu.h>
- #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/kprobes.h>
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/irq.h>
- #include <linux/kexec.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->cause, SIGSEGV);
- if (regs && kexec_should_crash(current))
- crash_kexec(regs);
- 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);
- }
- #ifdef CONFIG_VECTOR_EMU
- extern bool decode_exec_insn(struct pt_regs *regs, uint64_t insn);
- #endif
- void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
- {
- struct task_struct *tsk = current;
- #ifdef CONFIG_VECTOR_EMU
- if (signo == SIGILL)
- if (decode_exec_insn(regs, regs->badaddr))
- return;
- #endif
- 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 ", instruction_pointer(regs));
- pr_cont("\n");
- show_regs(regs);
- }
- force_sig_fault(signo, code, (void __user *)addr);
- }
- static void do_trap_error(struct pt_regs *regs, int signo, int code,
- unsigned long addr, const char *str)
- {
- current->thread.bad_cause = regs->cause;
- if (user_mode(regs)) {
- do_trap(regs, signo, code, addr);
- } else {
- if (!fixup_exception(regs))
- die(regs, str);
- }
- }
- #define DO_ERROR_INFO(name, signo, code, str) \
- asmlinkage __visible void name(struct pt_regs *regs) \
- { \
- do_trap_error(regs, signo, code, regs->epc, "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_fault,
- SIGSEGV, SEGV_ACCERR, "load access fault");
- #ifndef CONFIG_RISCV_M_MODE
- DO_ERROR_INFO(do_trap_load_misaligned,
- SIGBUS, BUS_ADRALN, "Oops - load address misaligned");
- DO_ERROR_INFO(do_trap_store_misaligned,
- SIGBUS, BUS_ADRALN, "Oops - store (or AMO) address misaligned");
- #else
- int handle_misaligned_load(struct pt_regs *regs);
- int handle_misaligned_store(struct pt_regs *regs);
- asmlinkage void do_trap_load_misaligned(struct pt_regs *regs)
- {
- if (!handle_misaligned_load(regs))
- return;
- do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc,
- "Oops - load address misaligned");
- }
- asmlinkage void do_trap_store_misaligned(struct pt_regs *regs)
- {
- if (!handle_misaligned_store(regs))
- return;
- do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc,
- "Oops - store (or AMO) address misaligned");
- }
- #endif
- 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");
- static inline unsigned long get_break_insn_length(unsigned long pc)
- {
- bug_insn_t insn;
- if (get_kernel_nofault(insn, (bug_insn_t *)pc))
- return 0;
- return GET_INSN_LENGTH(insn);
- }
- asmlinkage __visible void do_trap_break(struct pt_regs *regs)
- {
- #ifdef CONFIG_KPROBES
- if (kprobe_single_step_handler(regs))
- return;
- if (kprobe_breakpoint_handler(regs))
- return;
- #endif
- #ifdef CONFIG_UPROBES
- if (uprobe_single_step_handler(regs))
- return;
- if (uprobe_breakpoint_handler(regs))
- return;
- #endif
- current->thread.bad_cause = regs->cause;
- if (user_mode(regs))
- force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->epc);
- #ifdef CONFIG_KGDB
- else if (notify_die(DIE_TRAP, "EBREAK", regs, 0, regs->cause, SIGTRAP)
- == NOTIFY_STOP)
- return;
- #endif
- else if (report_bug(regs->epc, regs) == BUG_TRAP_TYPE_WARN)
- regs->epc += get_break_insn_length(regs->epc);
- else
- die(regs, "Kernel BUG");
- }
- #ifdef CONFIG_GENERIC_BUG
- int is_valid_bugaddr(unsigned long pc)
- {
- bug_insn_t insn;
- if (pc < VMALLOC_START)
- return 0;
- if (get_kernel_nofault(insn, (bug_insn_t *)pc))
- return 0;
- if ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32)
- return (insn == __BUG_INSN_32);
- else
- return ((insn & __COMPRESSED_INSN_MASK) == __BUG_INSN_16);
- }
- #endif /* CONFIG_GENERIC_BUG */
- /* stvec & scratch is already set from head.S */
- void trap_init(void)
- {
- }
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