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xtensa: dump userspace code around the exception PC
In the absence of other debug facilities dumping user code around the unhandled exception address may help debugging the issue. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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@ -38,3 +38,11 @@ config PRINT_STACK_DEPTH
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help
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This option allows you to set the stack depth that the kernel
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prints in stack traces.
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config PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION
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bool "Dump user code around unhandled exception address"
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help
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Enable this option to display user code around PC of the unhandled
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exception (starting at address aligned on 16 byte boundary).
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This may simplify finding faulting code in the absence of other
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debug facilities.
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@ -175,6 +175,23 @@ __die_if_kernel(const char *str, struct pt_regs *regs, long err)
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die(str, regs, err);
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}
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#ifdef CONFIG_PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION
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static inline void dump_user_code(struct pt_regs *regs)
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{
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char buf[32];
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if (copy_from_user(buf, (void __user *)(regs->pc & -16), sizeof(buf)) == 0) {
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print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE,
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32, 1, buf, sizeof(buf), false);
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}
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}
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#else
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static inline void dump_user_code(struct pt_regs *regs)
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{
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}
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#endif
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/*
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* Unhandled Exceptions. Kill user task or panic if in kernel space.
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*/
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@ -190,6 +207,7 @@ void do_unhandled(struct pt_regs *regs)
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"\tEXCCAUSE is %ld\n",
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current->comm, task_pid_nr(current), regs->pc,
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regs->exccause);
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dump_user_code(regs);
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force_sig(SIGILL);
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}
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