diff options
Diffstat (limited to 'arch/csky/kernel/traps.c')
| -rw-r--r-- | arch/csky/kernel/traps.c | 215 |
1 files changed, 155 insertions, 60 deletions
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c index b057480e7463..c2246b07cc9c 100644 --- a/arch/csky/kernel/traps.c +++ b/arch/csky/kernel/traps.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. +#include <linux/cpu.h> #include <linux/sched.h> #include <linux/signal.h> #include <linux/kernel.h> @@ -14,6 +15,9 @@ #include <linux/kallsyms.h> #include <linux/rtc.h> #include <linux/uaccess.h> +#include <linux/kprobes.h> +#include <linux/kdebug.h> +#include <linux/sched/debug.h> #include <asm/setup.h> #include <asm/traps.h> @@ -26,6 +30,8 @@ #include <abi/fpu.h> #endif +int show_unhandled_signals = 1; + /* Defined in entry.S */ asmlinkage void csky_trap(void); @@ -34,9 +40,7 @@ asmlinkage void csky_cmpxchg(void); asmlinkage void csky_get_tls(void); asmlinkage void csky_irq(void); -asmlinkage void csky_tlbinvalidl(void); -asmlinkage void csky_tlbinvalids(void); -asmlinkage void csky_tlbmodified(void); +asmlinkage void csky_pagefault(void); /* Defined in head.S */ asmlinkage void _start_smp_secondary(void); @@ -61,9 +65,9 @@ void __init trap_init(void) VEC_INIT(VEC_TRAP3, csky_get_tls); /* setup MMU TLB exception */ - VEC_INIT(VEC_TLBINVALIDL, csky_tlbinvalidl); - VEC_INIT(VEC_TLBINVALIDS, csky_tlbinvalids); - VEC_INIT(VEC_TLBMODIFIED, csky_tlbmodified); + VEC_INIT(VEC_TLBINVALIDL, csky_pagefault); + VEC_INIT(VEC_TLBINVALIDS, csky_pagefault); + VEC_INIT(VEC_TLBMODIFIED, csky_pagefault); #ifdef CONFIG_CPU_HAS_FPU init_fpu(); @@ -76,93 +80,184 @@ void __init trap_init(void) #endif } -void die_if_kernel(char *str, struct pt_regs *regs, int nr) +static DEFINE_SPINLOCK(die_lock); + +void die(struct pt_regs *regs, const char *str) { - if (user_mode(regs)) - return; + static int die_counter; + int ret; + oops_enter(); + + spin_lock_irq(&die_lock); console_verbose(); - pr_err("%s: %08x\n", str, nr); + bust_spinlocks(1); + + pr_emerg("%s [#%d]\n", str, ++die_counter); + print_modules(); show_regs(regs); + show_stack(current, (unsigned long *)regs->regs[4], KERN_INFO); + + ret = notify_die(DIE_OOPS, str, regs, 0, trap_no(regs), SIGSEGV); + + bust_spinlocks(0); add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); - do_exit(SIGSEGV); + 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) + make_task_dead(SIGSEGV); } -void buserr(struct pt_regs *regs) +void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr) { -#ifdef CONFIG_CPU_CK810 - static unsigned long prev_pc; + struct task_struct *tsk = current; - if ((regs->pc == prev_pc) && prev_pc != 0) { - prev_pc = 0; + if (show_unhandled_signals && unhandled_signal(tsk, signo) + && printk_ratelimit()) { + pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x%08lx", + 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.trap_no = trap_no(regs); + + if (user_mode(regs)) { + do_trap(regs, signo, code, addr); } else { - prev_pc = regs->pc; - return; + 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->pc, "Oops - " str); \ +} + +DO_ERROR_INFO(do_trap_unknown, + SIGILL, ILL_ILLTRP, "unknown exception"); +DO_ERROR_INFO(do_trap_zdiv, + SIGFPE, FPE_INTDIV, "error zero div exception"); +DO_ERROR_INFO(do_trap_buserr, + SIGSEGV, ILL_ILLADR, "error bus error exception"); + +asmlinkage void do_trap_misaligned(struct pt_regs *regs) +{ +#ifdef CONFIG_CPU_NEED_SOFTALIGN + csky_alignment(regs); +#else + current->thread.trap_no = trap_no(regs); + do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->pc, + "Oops - load/store address misaligned"); #endif +} - die_if_kernel("Kernel mode BUS error", regs, 0); +asmlinkage void do_trap_bkpt(struct pt_regs *regs) +{ +#ifdef CONFIG_KPROBES + if (kprobe_single_step_handler(regs)) + return; +#endif +#ifdef CONFIG_UPROBES + if (uprobe_single_step_handler(regs)) + return; +#endif + if (user_mode(regs)) { + send_sig(SIGTRAP, current, 0); + return; + } - pr_err("User mode Bus Error\n"); - show_regs(regs); + do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->pc, + "Oops - illegal trap exception"); +} - force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc); +asmlinkage void do_trap_illinsn(struct pt_regs *regs) +{ + current->thread.trap_no = trap_no(regs); + +#ifdef CONFIG_KPROBES + if (kprobe_breakpoint_handler(regs)) + return; +#endif +#ifdef CONFIG_UPROBES + if (uprobe_breakpoint_handler(regs)) + return; +#endif +#ifndef CONFIG_CPU_NO_USER_BKPT + if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) { + send_sig(SIGTRAP, current, 0); + return; + } +#endif + + do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc, + "Oops - illegal instruction exception"); } -#define USR_BKPT 0x1464 -asmlinkage void trap_c(struct pt_regs *regs) +asmlinkage void do_trap_fpe(struct pt_regs *regs) { - int sig; - unsigned long vector; - siginfo_t info; +#ifdef CONFIG_CPU_HAS_FPU + return fpu_fpe(regs); +#else + do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc, + "Oops - fpu instruction exception"); +#endif +} - vector = (mfcr("psr") >> 16) & 0xff; +asmlinkage void do_trap_priv(struct pt_regs *regs) +{ +#ifdef CONFIG_CPU_HAS_FPU + if (user_mode(regs) && fpu_libc_helper(regs)) + return; +#endif + do_trap_error(regs, SIGILL, ILL_PRVOPC, regs->pc, + "Oops - illegal privileged exception"); +} - switch (vector) { +asmlinkage void trap_c(struct pt_regs *regs) +{ + switch (trap_no(regs)) { case VEC_ZERODIV: - die_if_kernel("Kernel mode ZERO DIV", regs, vector); - sig = SIGFPE; + do_trap_zdiv(regs); break; - /* ptrace */ case VEC_TRACE: - info.si_code = TRAP_TRACE; - sig = SIGTRAP; + do_trap_bkpt(regs); break; case VEC_ILLEGAL: - die_if_kernel("Kernel mode ILLEGAL", regs, vector); -#ifndef CONFIG_CPU_NO_USER_BKPT - if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) -#endif - { - sig = SIGILL; - break; - } - /* gdbserver breakpoint */ + do_trap_illinsn(regs); + break; case VEC_TRAP1: - /* jtagserver breakpoint */ case VEC_BREAKPOINT: - die_if_kernel("Kernel mode BKPT", regs, vector); - info.si_code = TRAP_BRKPT; - sig = SIGTRAP; + do_trap_bkpt(regs); break; case VEC_ACCESS: - return buserr(regs); -#ifdef CONFIG_CPU_NEED_SOFTALIGN + do_trap_buserr(regs); + break; case VEC_ALIGN: - return csky_alignment(regs); -#endif -#ifdef CONFIG_CPU_HAS_FPU + do_trap_misaligned(regs); + break; case VEC_FPE: - die_if_kernel("Kernel mode FPE", regs, vector); - return fpu_fpe(regs); + do_trap_fpe(regs); + break; case VEC_PRIV: - die_if_kernel("Kernel mode PRIV", regs, vector); - if (fpu_libc_helper(regs)) - return; -#endif + do_trap_priv(regs); + break; default: - sig = SIGSEGV; + do_trap_unknown(regs); break; } - send_sig(sig, current, 0); } |