424 lines
15 KiB
C
424 lines
15 KiB
C
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/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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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/module.h>
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#include <linux/ptrace.h>
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#include <linux/kallsyms.h>
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#include <linux/bug.h>
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#include <asm/soc.h>
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#include <asm/traps.h>
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int (*c6x_nmi_handler)(struct pt_regs *regs);
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void __init trap_init(void)
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{
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ack_exception(EXCEPT_TYPE_NXF);
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ack_exception(EXCEPT_TYPE_EXC);
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ack_exception(EXCEPT_TYPE_IXF);
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ack_exception(EXCEPT_TYPE_SXF);
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enable_exception();
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}
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void show_regs(struct pt_regs *regs)
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{
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pr_err("\n");
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pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
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pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
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pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
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pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
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pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
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pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
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pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
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pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
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pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
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pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
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pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
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pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
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pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
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pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
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pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
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pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
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pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
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pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
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pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
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pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
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pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
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pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
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pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
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pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
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pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
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pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
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pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
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pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
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pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
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pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
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pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
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pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
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pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
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pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
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}
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void dump_stack(void)
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{
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unsigned long stack;
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show_stack(current, &stack);
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}
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EXPORT_SYMBOL(dump_stack);
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void die(char *str, struct pt_regs *fp, int nr)
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{
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console_verbose();
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pr_err("%s: %08x\n", str, nr);
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show_regs(fp);
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pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, (PAGE_SIZE +
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(unsigned long) current));
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dump_stack();
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while (1)
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;
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}
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static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
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{
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if (user_mode(fp))
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return;
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die(str, fp, nr);
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}
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/* Internal exceptions */
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static struct exception_info iexcept_table[10] = {
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{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
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{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
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{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
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{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
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{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
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{ "Oops - resource access", SIGILL, ILL_PRVREG },
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{ "Oops - privilege", SIGILL, ILL_PRVOPC },
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{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
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{ "Oops - software exception", SIGILL, ILL_ILLTRP },
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{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
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};
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/* External exceptions */
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static struct exception_info eexcept_table[128] = {
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - external exception", SIGBUS, BUS_ADRERR },
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{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
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{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
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{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
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{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
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{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
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{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
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{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
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{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
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{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
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};
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static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
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{
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unsigned long addr = instruction_pointer(regs);
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siginfo_t info;
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if (except_info->code != TRAP_BRKPT)
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pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
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except_info->kernel_str, regs->pc,
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except_info->signo, except_info->code);
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die_if_kernel(except_info->kernel_str, regs, addr);
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info.si_signo = except_info->signo;
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info.si_errno = 0;
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info.si_code = except_info->code;
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info.si_addr = (void __user *)addr;
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force_sig_info(except_info->signo, &info, current);
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}
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/*
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* Process an internal exception (non maskable)
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*/
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static int process_iexcept(struct pt_regs *regs)
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{
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unsigned int iexcept_report = get_iexcept();
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unsigned int iexcept_num;
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ack_exception(EXCEPT_TYPE_IXF);
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pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
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while (iexcept_report) {
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iexcept_num = __ffs(iexcept_report);
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iexcept_report &= ~(1 << iexcept_num);
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||
|
|
set_iexcept(iexcept_report);
|
||
|
|
if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
|
||
|
|
/* This is a breakpoint */
|
||
|
|
struct exception_info bkpt_exception = {
|
||
|
|
"Oops - undefined instruction",
|
||
|
|
SIGTRAP, TRAP_BRKPT
|
||
|
|
};
|
||
|
|
do_trap(&bkpt_exception, regs);
|
||
|
|
iexcept_report &= ~(0xFF);
|
||
|
|
set_iexcept(iexcept_report);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
do_trap(&iexcept_table[iexcept_num], regs);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Process an external exception (maskable)
|
||
|
|
*/
|
||
|
|
static void process_eexcept(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
int evt;
|
||
|
|
|
||
|
|
pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
|
||
|
|
|
||
|
|
while ((evt = soc_get_exception()) >= 0)
|
||
|
|
do_trap(&eexcept_table[evt], regs);
|
||
|
|
|
||
|
|
ack_exception(EXCEPT_TYPE_EXC);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Main exception processing
|
||
|
|
*/
|
||
|
|
asmlinkage int process_exception(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
unsigned int type;
|
||
|
|
unsigned int type_num;
|
||
|
|
unsigned int ie_num = 9; /* default is unknown exception */
|
||
|
|
|
||
|
|
while ((type = get_except_type()) != 0) {
|
||
|
|
type_num = fls(type) - 1;
|
||
|
|
|
||
|
|
switch (type_num) {
|
||
|
|
case EXCEPT_TYPE_NXF:
|
||
|
|
ack_exception(EXCEPT_TYPE_NXF);
|
||
|
|
if (c6x_nmi_handler)
|
||
|
|
(c6x_nmi_handler)(regs);
|
||
|
|
else
|
||
|
|
pr_alert("NMI interrupt!\n");
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EXCEPT_TYPE_IXF:
|
||
|
|
if (process_iexcept(regs))
|
||
|
|
return 1;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EXCEPT_TYPE_EXC:
|
||
|
|
process_eexcept(regs);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case EXCEPT_TYPE_SXF:
|
||
|
|
ie_num = 8;
|
||
|
|
default:
|
||
|
|
ack_exception(type_num);
|
||
|
|
do_trap(&iexcept_table[ie_num], regs);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kstack_depth_to_print = 48;
|
||
|
|
|
||
|
|
static void show_trace(unsigned long *stack, unsigned long *endstack)
|
||
|
|
{
|
||
|
|
unsigned long addr;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
pr_debug("Call trace:");
|
||
|
|
i = 0;
|
||
|
|
while (stack + 1 <= endstack) {
|
||
|
|
addr = *stack++;
|
||
|
|
/*
|
||
|
|
* If the address is either in the text segment of the
|
||
|
|
* kernel, or in the region which contains vmalloc'ed
|
||
|
|
* memory, it *may* be the address of a calling
|
||
|
|
* routine; if so, print it so that someone tracing
|
||
|
|
* down the cause of the crash will be able to figure
|
||
|
|
* out the call path that was taken.
|
||
|
|
*/
|
||
|
|
if (__kernel_text_address(addr)) {
|
||
|
|
#ifndef CONFIG_KALLSYMS
|
||
|
|
if (i % 5 == 0)
|
||
|
|
pr_debug("\n ");
|
||
|
|
#endif
|
||
|
|
pr_debug(" [<%08lx>]", addr);
|
||
|
|
print_symbol(" %s\n", addr);
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
pr_debug("\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
void show_stack(struct task_struct *task, unsigned long *stack)
|
||
|
|
{
|
||
|
|
unsigned long *p, *endstack;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
if (!stack) {
|
||
|
|
if (task && task != current)
|
||
|
|
/* We know this is a kernel stack,
|
||
|
|
so this is the start/end */
|
||
|
|
stack = (unsigned long *)thread_saved_ksp(task);
|
||
|
|
else
|
||
|
|
stack = (unsigned long *)&stack;
|
||
|
|
}
|
||
|
|
endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
|
||
|
|
& -THREAD_SIZE);
|
||
|
|
|
||
|
|
pr_debug("Stack from %08lx:", (unsigned long)stack);
|
||
|
|
for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
|
||
|
|
if (p + 1 > endstack)
|
||
|
|
break;
|
||
|
|
if (i % 8 == 0)
|
||
|
|
pr_cont("\n ");
|
||
|
|
pr_cont(" %08lx", *p++);
|
||
|
|
}
|
||
|
|
pr_cont("\n");
|
||
|
|
show_trace(stack, endstack);
|
||
|
|
}
|
||
|
|
|
||
|
|
int is_valid_bugaddr(unsigned long addr)
|
||
|
|
{
|
||
|
|
return __kernel_text_address(addr);
|
||
|
|
}
|