950 lines
26 KiB
C
950 lines
26 KiB
C
/*
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* File: arch/blackfin/kernel/traps.c
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* Based on:
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* Author: Hamish Macdonald
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*
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* Created:
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* Description: uses S/W interrupt 15 for the system calls
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/uaccess.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/fs.h>
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#include <asm/traps.h>
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#include <asm/cacheflush.h>
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#include <asm/blackfin.h>
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#include <asm/irq_handler.h>
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#include <linux/irq.h>
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#include <asm/trace.h>
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#include <asm/fixed_code.h>
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#include <asm/dma.h>
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#ifdef CONFIG_KGDB
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# include <linux/debugger.h>
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# include <linux/kgdb.h>
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# define CHK_DEBUGGER_TRAP() \
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do { \
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CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
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} while (0)
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# define CHK_DEBUGGER_TRAP_MAYBE() \
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do { \
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if (kgdb_connected) \
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CHK_DEBUGGER_TRAP(); \
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} while (0)
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#else
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# define CHK_DEBUGGER_TRAP() do { } while (0)
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# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
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#endif
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/* Initiate the event table handler */
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void __init trap_init(void)
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{
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CSYNC();
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bfin_write_EVT3(trap);
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CSYNC();
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}
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void *saved_icplb_fault_addr, *saved_dcplb_fault_addr;
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int kstack_depth_to_print = 48;
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static void decode_address(char *buf, unsigned long address)
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{
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struct vm_list_struct *vml;
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struct task_struct *p;
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struct mm_struct *mm;
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unsigned long flags, offset;
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unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
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#ifdef CONFIG_KALLSYMS
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unsigned long symsize;
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const char *symname;
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char *modname;
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char *delim = ":";
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char namebuf[128];
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/* look up the address and see if we are in kernel space */
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symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
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if (symname) {
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/* yeah! kernel space! */
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if (!modname)
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modname = delim = "";
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sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
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(void *)address, delim, modname, delim, symname,
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(unsigned long)offset);
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return;
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}
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#endif
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/* Problem in fixed code section? */
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if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
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sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
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return;
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}
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/* Problem somewhere before the kernel start address */
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if (address < CONFIG_BOOT_LOAD) {
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sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
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return;
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}
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/* looks like we're off in user-land, so let's walk all the
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* mappings of all our processes and see if we can't be a whee
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* bit more specific
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*/
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write_lock_irqsave(&tasklist_lock, flags);
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for_each_process(p) {
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mm = (in_atomic ? p->mm : get_task_mm(p));
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if (!mm)
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continue;
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vml = mm->context.vmlist;
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while (vml) {
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struct vm_area_struct *vma = vml->vma;
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if (address >= vma->vm_start && address < vma->vm_end) {
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char _tmpbuf[256];
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char *name = p->comm;
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struct file *file = vma->vm_file;
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if (file)
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name = d_path(&file->f_path, _tmpbuf,
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sizeof(_tmpbuf));
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/* FLAT does not have its text aligned to the start of
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* the map while FDPIC ELF does ...
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*/
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/* before we can check flat/fdpic, we need to
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* make sure current is valid
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*/
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if ((unsigned long)current >= FIXED_CODE_START &&
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!((unsigned long)current & 0x3)) {
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if (current->mm &&
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(address > current->mm->start_code) &&
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(address < current->mm->end_code))
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offset = address - current->mm->start_code;
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else
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offset = (address - vma->vm_start) +
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(vma->vm_pgoff << PAGE_SHIFT);
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sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
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(void *)address, name, offset);
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} else
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sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
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(void *)address, name,
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vma->vm_start, vma->vm_end);
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if (!in_atomic)
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mmput(mm);
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goto done;
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}
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vml = vml->next;
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}
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if (!in_atomic)
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mmput(mm);
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}
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/* we were unable to find this address anywhere */
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sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
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done:
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write_unlock_irqrestore(&tasklist_lock, flags);
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}
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asmlinkage void double_fault_c(struct pt_regs *fp)
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{
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console_verbose();
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oops_in_progress = 1;
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printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
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dump_bfin_process(fp);
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dump_bfin_mem(fp);
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show_regs(fp);
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panic("Double Fault - unrecoverable event\n");
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}
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asmlinkage void trap_c(struct pt_regs *fp)
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{
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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int j;
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#endif
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int sig = 0;
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siginfo_t info;
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unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
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trace_buffer_save(j);
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/* Important - be very careful dereferncing pointers - will lead to
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* double faults if the stack has become corrupt
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*/
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/* If the fault was caused by a kernel thread, or interrupt handler
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* we will kernel panic, so the system reboots.
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* If KGDB is enabled, don't set this for kernel breakpoints
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*/
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/* TODO: check to see if we are in some sort of deferred HWERR
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* that we should be able to recover from, not kernel panic
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*/
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if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
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#ifdef CONFIG_KGDB
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&& (trapnr != VEC_EXCPT02)
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#endif
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){
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console_verbose();
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oops_in_progress = 1;
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} else if (current) {
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if (current->mm == NULL) {
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console_verbose();
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oops_in_progress = 1;
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}
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}
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/* trap_c() will be called for exceptions. During exceptions
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* processing, the pc value should be set with retx value.
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* With this change we can cleanup some code in signal.c- TODO
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*/
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fp->orig_pc = fp->retx;
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/* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
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trapnr, fp->ipend, fp->pc, fp->retx); */
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/* send the appropriate signal to the user program */
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switch (trapnr) {
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/* This table works in conjuction with the one in ./mach-common/entry.S
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* Some exceptions are handled there (in assembly, in exception space)
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* Some are handled here, (in C, in interrupt space)
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* Some, like CPLB, are handled in both, where the normal path is
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* handled in assembly/exception space, and the error path is handled
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* here
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*/
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/* 0x00 - Linux Syscall, getting here is an error */
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/* 0x01 - userspace gdb breakpoint, handled here */
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case VEC_EXCPT01:
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info.si_code = TRAP_ILLTRAP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a breakpoint in kernel space */
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if (fp->ipend & 0xffc0)
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return;
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else
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break;
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#ifdef CONFIG_KGDB
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case VEC_EXCPT02 : /* gdb connection */
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info.si_code = TRAP_ILLTRAP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP();
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return;
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#else
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/* 0x02 - User Defined, Caught by default */
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#endif
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/* 0x03 - User Defined, userspace stack overflow */
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case VEC_EXCPT03:
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info.si_code = SEGV_STACKFLOW;
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sig = SIGSEGV;
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printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x04 - User Defined, Caught by default */
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/* 0x05 - User Defined, Caught by default */
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/* 0x06 - User Defined, Caught by default */
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/* 0x07 - User Defined, Caught by default */
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/* 0x08 - User Defined, Caught by default */
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/* 0x09 - User Defined, Caught by default */
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/* 0x0A - User Defined, Caught by default */
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/* 0x0B - User Defined, Caught by default */
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/* 0x0C - User Defined, Caught by default */
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/* 0x0D - User Defined, Caught by default */
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/* 0x0E - User Defined, Caught by default */
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/* 0x0F - User Defined, Caught by default */
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/* 0x10 HW Single step, handled here */
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case VEC_STEP:
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info.si_code = TRAP_STEP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a single step in kernel space */
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if (fp->ipend & 0xffc0)
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return;
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else
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break;
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/* 0x11 - Trace Buffer Full, handled here */
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case VEC_OVFLOW:
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info.si_code = TRAP_TRACEFLOW;
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sig = SIGTRAP;
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printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x12 - Reserved, Caught by default */
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/* 0x13 - Reserved, Caught by default */
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/* 0x14 - Reserved, Caught by default */
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/* 0x15 - Reserved, Caught by default */
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/* 0x16 - Reserved, Caught by default */
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/* 0x17 - Reserved, Caught by default */
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/* 0x18 - Reserved, Caught by default */
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/* 0x19 - Reserved, Caught by default */
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/* 0x1A - Reserved, Caught by default */
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/* 0x1B - Reserved, Caught by default */
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/* 0x1C - Reserved, Caught by default */
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/* 0x1D - Reserved, Caught by default */
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/* 0x1E - Reserved, Caught by default */
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/* 0x1F - Reserved, Caught by default */
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/* 0x20 - Reserved, Caught by default */
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/* 0x21 - Undefined Instruction, handled here */
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case VEC_UNDEF_I:
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info.si_code = ILL_ILLOPC;
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sig = SIGILL;
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printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x22 - Illegal Instruction Combination, handled here */
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case VEC_ILGAL_I:
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info.si_code = ILL_ILLPARAOP;
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sig = SIGILL;
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printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x23 - Data CPLB protection violation, handled here */
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case VEC_CPLB_VL:
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info.si_code = ILL_CPLB_VI;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x24 - Data access misaligned, handled here */
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case VEC_MISALI_D:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x25 - Unrecoverable Event, handled here */
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case VEC_UNCOV:
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info.si_code = ILL_ILLEXCPT;
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sig = SIGILL;
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printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
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error case is handled here */
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case VEC_CPLB_M:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
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case VEC_CPLB_MHIT:
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info.si_code = ILL_CPLB_MULHIT;
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sig = SIGSEGV;
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#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
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if (saved_dcplb_fault_addr < (void *)FIXED_CODE_START)
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printk(KERN_NOTICE "NULL pointer access\n");
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else
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#endif
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printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x28 - Emulation Watchpoint, handled here */
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case VEC_WATCH:
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info.si_code = TRAP_WATCHPT;
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sig = SIGTRAP;
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pr_debug(EXC_0x28(KERN_DEBUG));
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a watchpoint in kernel space */
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if (fp->ipend & 0xffc0)
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return;
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else
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break;
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#ifdef CONFIG_BF535
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/* 0x29 - Instruction fetch access error (535 only) */
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case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
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info.si_code = BUS_OPFETCH;
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sig = SIGBUS;
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printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
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CHK_DEBUGGER_TRAP();
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break;
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#else
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/* 0x29 - Reserved, Caught by default */
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#endif
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/* 0x2A - Instruction fetch misaligned, handled here */
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case VEC_MISALI_I:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x2B - Instruction CPLB protection violation, handled here */
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case VEC_CPLB_I_VL:
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info.si_code = ILL_CPLB_VI;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
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case VEC_CPLB_I_M:
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info.si_code = ILL_CPLB_MISS;
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sig = SIGBUS;
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printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x2D - Instruction CPLB Multiple Hits, handled here */
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case VEC_CPLB_I_MHIT:
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info.si_code = ILL_CPLB_MULHIT;
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sig = SIGSEGV;
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#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
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if (saved_icplb_fault_addr < (void *)FIXED_CODE_START)
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printk(KERN_NOTICE "Jump to NULL address\n");
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else
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#endif
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printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x2E - Illegal use of Supervisor Resource, handled here */
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case VEC_ILL_RES:
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info.si_code = ILL_PRVOPC;
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sig = SIGILL;
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printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
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CHK_DEBUGGER_TRAP();
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break;
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/* 0x2F - Reserved, Caught by default */
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/* 0x30 - Reserved, Caught by default */
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/* 0x31 - Reserved, Caught by default */
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/* 0x32 - Reserved, Caught by default */
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/* 0x33 - Reserved, Caught by default */
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/* 0x34 - Reserved, Caught by default */
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/* 0x35 - Reserved, Caught by default */
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/* 0x36 - Reserved, Caught by default */
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/* 0x37 - Reserved, Caught by default */
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/* 0x38 - Reserved, Caught by default */
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/* 0x39 - Reserved, Caught by default */
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/* 0x3A - Reserved, Caught by default */
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/* 0x3B - Reserved, Caught by default */
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/* 0x3C - Reserved, Caught by default */
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/* 0x3D - Reserved, Caught by default */
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/* 0x3E - Reserved, Caught by default */
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/* 0x3F - Reserved, Caught by default */
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case VEC_HWERR:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
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/* System MMR Error */
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case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
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break;
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/* External Memory Addressing Error */
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case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
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info.si_code = BUS_ADRERR;
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sig = SIGBUS;
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printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
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break;
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/* Performance Monitor Overflow */
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case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
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printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
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break;
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/* RAISE 5 instruction */
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case (SEQSTAT_HWERRCAUSE_RAISE_5):
|
|
printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
|
|
break;
|
|
default: /* Reserved */
|
|
printk(KERN_NOTICE HWC_default(KERN_NOTICE));
|
|
break;
|
|
}
|
|
CHK_DEBUGGER_TRAP();
|
|
break;
|
|
default:
|
|
info.si_code = TRAP_ILLTRAP;
|
|
sig = SIGTRAP;
|
|
printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
|
|
(fp->seqstat & SEQSTAT_EXCAUSE));
|
|
CHK_DEBUGGER_TRAP();
|
|
break;
|
|
}
|
|
|
|
BUG_ON(sig == 0);
|
|
|
|
if (sig != SIGTRAP) {
|
|
unsigned long stack;
|
|
dump_bfin_process(fp);
|
|
dump_bfin_mem(fp);
|
|
show_regs(fp);
|
|
|
|
/* Print out the trace buffer if it makes sense */
|
|
#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
|
|
if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
|
|
printk(KERN_NOTICE "No trace since you do not have "
|
|
"CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
|
|
KERN_NOTICE "\n");
|
|
else
|
|
#endif
|
|
dump_bfin_trace_buffer();
|
|
show_stack(current, &stack);
|
|
if (oops_in_progress) {
|
|
print_modules();
|
|
#ifndef CONFIG_ACCESS_CHECK
|
|
printk(KERN_EMERG "Please turn on "
|
|
"CONFIG_ACCESS_CHECK\n");
|
|
#endif
|
|
panic("Kernel exception");
|
|
}
|
|
}
|
|
|
|
info.si_signo = sig;
|
|
info.si_errno = 0;
|
|
info.si_addr = (void __user *)fp->pc;
|
|
force_sig_info(sig, &info, current);
|
|
|
|
trace_buffer_restore(j);
|
|
return;
|
|
}
|
|
|
|
/* Typical exception handling routines */
|
|
|
|
#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
|
|
|
|
void dump_bfin_trace_buffer(void)
|
|
{
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
|
|
int tflags, i = 0;
|
|
char buf[150];
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
|
|
int j, index;
|
|
#endif
|
|
|
|
trace_buffer_save(tflags);
|
|
|
|
printk(KERN_NOTICE "Hardware Trace:\n");
|
|
|
|
if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
|
|
for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
|
|
decode_address(buf, (unsigned long)bfin_read_TBUF());
|
|
printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
|
|
decode_address(buf, (unsigned long)bfin_read_TBUF());
|
|
printk(KERN_NOTICE " Source : %s\n", buf);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
|
|
if (trace_buff_offset)
|
|
index = trace_buff_offset/4 - 1;
|
|
else
|
|
index = EXPAND_LEN;
|
|
|
|
j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
|
|
while (j) {
|
|
decode_address(buf, software_trace_buff[index]);
|
|
printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
|
|
index -= 1;
|
|
if (index < 0 )
|
|
index = EXPAND_LEN;
|
|
decode_address(buf, software_trace_buff[index]);
|
|
printk(KERN_NOTICE " Source : %s\n", buf);
|
|
index -= 1;
|
|
if (index < 0)
|
|
index = EXPAND_LEN;
|
|
j--;
|
|
i++;
|
|
}
|
|
#endif
|
|
|
|
trace_buffer_restore(tflags);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(dump_bfin_trace_buffer);
|
|
|
|
static void show_trace(struct task_struct *tsk, unsigned long *sp)
|
|
{
|
|
unsigned long addr;
|
|
|
|
printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
|
|
|
|
while (!kstack_end(sp)) {
|
|
addr = *sp++;
|
|
/*
|
|
* 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))
|
|
print_ip_sym(addr);
|
|
}
|
|
|
|
printk(KERN_NOTICE "\n");
|
|
}
|
|
|
|
void show_stack(struct task_struct *task, unsigned long *stack)
|
|
{
|
|
unsigned long *endstack, addr;
|
|
int i;
|
|
|
|
/* Cannot call dump_bfin_trace_buffer() here as show_stack() is
|
|
* called externally in some places in the kernel.
|
|
*/
|
|
|
|
if (!stack) {
|
|
if (task)
|
|
stack = (unsigned long *)task->thread.ksp;
|
|
else
|
|
stack = (unsigned long *)&stack;
|
|
}
|
|
|
|
addr = (unsigned long)stack;
|
|
endstack = (unsigned long *)PAGE_ALIGN(addr);
|
|
|
|
printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
|
|
for (i = 0; i < kstack_depth_to_print; i++) {
|
|
if (stack + 1 > endstack)
|
|
break;
|
|
if (i % 8 == 0)
|
|
printk("\n" KERN_NOTICE " ");
|
|
printk(" %08lx", *stack++);
|
|
}
|
|
printk("\n");
|
|
|
|
show_trace(task, stack);
|
|
}
|
|
|
|
void dump_stack(void)
|
|
{
|
|
unsigned long stack;
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
|
|
int tflags;
|
|
#endif
|
|
trace_buffer_save(tflags);
|
|
dump_bfin_trace_buffer();
|
|
show_stack(current, &stack);
|
|
trace_buffer_restore(tflags);
|
|
}
|
|
EXPORT_SYMBOL(dump_stack);
|
|
|
|
void dump_bfin_process(struct pt_regs *fp)
|
|
{
|
|
/* We should be able to look at fp->ipend, but we don't push it on the
|
|
* stack all the time, so do this until we fix that */
|
|
unsigned int context = bfin_read_IPEND();
|
|
|
|
if (oops_in_progress)
|
|
printk(KERN_EMERG "Kernel OOPS in progress\n");
|
|
|
|
if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
|
|
printk(KERN_NOTICE "HW Error context\n");
|
|
else if (context & 0x0020)
|
|
printk(KERN_NOTICE "Deferred Exception context\n");
|
|
else if (context & 0x3FC0)
|
|
printk(KERN_NOTICE "Interrupt context\n");
|
|
else if (context & 0x4000)
|
|
printk(KERN_NOTICE "Deferred Interrupt context\n");
|
|
else if (context & 0x8000)
|
|
printk(KERN_NOTICE "Kernel process context\n");
|
|
|
|
/* Because we are crashing, and pointers could be bad, we check things
|
|
* pretty closely before we use them
|
|
*/
|
|
if ((unsigned long)current >= FIXED_CODE_START &&
|
|
!((unsigned long)current & 0x3) && current->pid) {
|
|
printk(KERN_NOTICE "CURRENT PROCESS:\n");
|
|
if (current->comm >= (char *)FIXED_CODE_START)
|
|
printk(KERN_NOTICE "COMM=%s PID=%d\n",
|
|
current->comm, current->pid);
|
|
else
|
|
printk(KERN_NOTICE "COMM= invalid\n");
|
|
|
|
if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
|
|
printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
|
|
KERN_NOTICE " BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
|
|
KERN_NOTICE "\n",
|
|
(void *)current->mm->start_code,
|
|
(void *)current->mm->end_code,
|
|
(void *)current->mm->start_data,
|
|
(void *)current->mm->end_data,
|
|
(void *)current->mm->end_data,
|
|
(void *)current->mm->brk,
|
|
(void *)current->mm->start_stack);
|
|
else
|
|
printk(KERN_NOTICE "invalid mm\n");
|
|
} else
|
|
printk(KERN_NOTICE "\n" KERN_NOTICE
|
|
"No Valid process in current context\n");
|
|
}
|
|
|
|
void dump_bfin_mem(struct pt_regs *fp)
|
|
{
|
|
unsigned short *addr, *erraddr, val = 0, err = 0;
|
|
char sti = 0, buf[6];
|
|
|
|
erraddr = (void *)fp->pc;
|
|
|
|
printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
|
|
|
|
for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
|
|
addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
|
|
addr++) {
|
|
if (!((unsigned long)addr & 0xF))
|
|
printk("\n" KERN_NOTICE "0x%p: ", addr);
|
|
|
|
if (get_user(val, addr)) {
|
|
if (addr >= (unsigned short *)L1_CODE_START &&
|
|
addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) {
|
|
dma_memcpy(&val, addr, sizeof(val));
|
|
sprintf(buf, "%04x", val);
|
|
} else if (addr >= (unsigned short *)FIXED_CODE_START &&
|
|
addr <= (unsigned short *)memory_start) {
|
|
val = bfin_read16(addr);
|
|
sprintf(buf, "%04x", val);
|
|
} else {
|
|
val = 0;
|
|
sprintf(buf, "????");
|
|
}
|
|
} else
|
|
sprintf(buf, "%04x", val);
|
|
|
|
if (addr == erraddr) {
|
|
printk("[%s]", buf);
|
|
err = val;
|
|
} else
|
|
printk(" %s ", buf);
|
|
|
|
/* Do any previous instructions turn on interrupts? */
|
|
if (addr <= erraddr && /* in the past */
|
|
((val >= 0x0040 && val <= 0x0047) || /* STI instruction */
|
|
val == 0x017b)) /* [SP++] = RETI */
|
|
sti = 1;
|
|
}
|
|
|
|
printk("\n");
|
|
|
|
/* Hardware error interrupts can be deferred */
|
|
if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
|
|
oops_in_progress)){
|
|
printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
|
|
#ifndef CONFIG_DEBUG_HWERR
|
|
printk(KERN_NOTICE "The remaining message may be meaningless\n"
|
|
KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
|
|
" better idea where it came from\n");
|
|
#else
|
|
/* If we are handling only one peripheral interrupt
|
|
* and current mm and pid are valid, and the last error
|
|
* was in that user space process's text area
|
|
* print it out - because that is where the problem exists
|
|
*/
|
|
if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
|
|
(current->pid && current->mm)) {
|
|
/* And the last RETI points to the current userspace context */
|
|
if ((fp + 1)->pc >= current->mm->start_code &&
|
|
(fp + 1)->pc <= current->mm->end_code) {
|
|
printk(KERN_NOTICE "It might be better to look around here : \n");
|
|
printk(KERN_NOTICE "-------------------------------------------\n");
|
|
show_regs(fp + 1);
|
|
printk(KERN_NOTICE "-------------------------------------------\n");
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void show_regs(struct pt_regs *fp)
|
|
{
|
|
char buf [150];
|
|
struct irqaction *action;
|
|
unsigned int i;
|
|
unsigned long flags;
|
|
|
|
printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
|
|
printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
|
|
(long)fp->seqstat, fp->ipend, fp->syscfg);
|
|
printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
|
|
(fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
|
|
printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
|
|
fp->seqstat & SEQSTAT_EXCAUSE);
|
|
for (i = 6; i <= 15 ; i++) {
|
|
if (fp->ipend & (1 << i)) {
|
|
decode_address(buf, bfin_read32(EVT0 + 4*i));
|
|
printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
|
|
}
|
|
}
|
|
|
|
/* if no interrupts are going off, don't print this out */
|
|
if (fp->ipend & ~0x3F) {
|
|
for (i = 0; i < (NR_IRQS - 1); i++) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto unlock;
|
|
|
|
decode_address(buf, (unsigned int)action->handler);
|
|
printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf);
|
|
for (action = action->next; action; action = action->next) {
|
|
decode_address(buf, (unsigned int)action->handler);
|
|
printk(", %s", buf);
|
|
}
|
|
printk("\n");
|
|
unlock:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
}
|
|
}
|
|
|
|
decode_address(buf, fp->rete);
|
|
printk(KERN_NOTICE " RETE: %s\n", buf);
|
|
decode_address(buf, fp->retn);
|
|
printk(KERN_NOTICE " RETN: %s\n", buf);
|
|
decode_address(buf, fp->retx);
|
|
printk(KERN_NOTICE " RETX: %s\n", buf);
|
|
decode_address(buf, fp->rets);
|
|
printk(KERN_NOTICE " RETS: %s\n", buf);
|
|
decode_address(buf, fp->pc);
|
|
printk(KERN_NOTICE " PC : %s\n", buf);
|
|
|
|
if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
|
|
(((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
|
|
decode_address(buf, saved_dcplb_fault_addr);
|
|
printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
|
|
decode_address(buf, saved_icplb_fault_addr);
|
|
printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
|
|
}
|
|
|
|
printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
|
|
printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
|
|
fp->r0, fp->r1, fp->r2, fp->r3);
|
|
printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
|
|
fp->r4, fp->r5, fp->r6, fp->r7);
|
|
printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
|
|
fp->p0, fp->p1, fp->p2, fp->p3);
|
|
printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
|
|
fp->p4, fp->p5, fp->fp, (long)fp);
|
|
printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
|
|
fp->lb0, fp->lt0, fp->lc0);
|
|
printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
|
|
fp->lb1, fp->lt1, fp->lc1);
|
|
printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
|
|
fp->b0, fp->l0, fp->m0, fp->i0);
|
|
printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
|
|
fp->b1, fp->l1, fp->m1, fp->i1);
|
|
printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
|
|
fp->b2, fp->l2, fp->m2, fp->i2);
|
|
printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
|
|
fp->b3, fp->l3, fp->m3, fp->i3);
|
|
printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
|
|
fp->a0w, fp->a0x, fp->a1w, fp->a1x);
|
|
|
|
printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
|
|
rdusp(), fp->astat);
|
|
|
|
printk(KERN_NOTICE "\n");
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
|
|
asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
|
|
#endif
|
|
|
|
asmlinkage int sys_bfin_spinlock(int *spinlock)
|
|
{
|
|
int ret = 0;
|
|
int tmp = 0;
|
|
|
|
local_irq_disable();
|
|
ret = get_user(tmp, spinlock);
|
|
if (ret == 0) {
|
|
if (tmp)
|
|
ret = 1;
|
|
tmp = 1;
|
|
put_user(tmp, spinlock);
|
|
}
|
|
local_irq_enable();
|
|
return ret;
|
|
}
|
|
|
|
int bfin_request_exception(unsigned int exception, void (*handler)(void))
|
|
{
|
|
void (*curr_handler)(void);
|
|
|
|
if (exception > 0x3F)
|
|
return -EINVAL;
|
|
|
|
curr_handler = ex_table[exception];
|
|
|
|
if (curr_handler != ex_replaceable)
|
|
return -EBUSY;
|
|
|
|
ex_table[exception] = handler;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bfin_request_exception);
|
|
|
|
int bfin_free_exception(unsigned int exception, void (*handler)(void))
|
|
{
|
|
void (*curr_handler)(void);
|
|
|
|
if (exception > 0x3F)
|
|
return -EINVAL;
|
|
|
|
curr_handler = ex_table[exception];
|
|
|
|
if (curr_handler != handler)
|
|
return -EBUSY;
|
|
|
|
ex_table[exception] = ex_replaceable;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bfin_free_exception);
|
|
|
|
void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
|
|
{
|
|
switch (cplb_panic) {
|
|
case CPLB_NO_UNLOCKED:
|
|
printk(KERN_EMERG "All CPLBs are locked\n");
|
|
break;
|
|
case CPLB_PROT_VIOL:
|
|
return;
|
|
case CPLB_NO_ADDR_MATCH:
|
|
return;
|
|
case CPLB_UNKNOWN_ERR:
|
|
printk(KERN_EMERG "Unknown CPLB Exception\n");
|
|
break;
|
|
}
|
|
|
|
oops_in_progress = 1;
|
|
|
|
printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", saved_dcplb_fault_addr);
|
|
printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", saved_icplb_fault_addr);
|
|
dump_bfin_process(fp);
|
|
dump_bfin_mem(fp);
|
|
show_regs(fp);
|
|
dump_stack();
|
|
panic("Unrecoverable event\n");
|
|
}
|