/*
- * File: arch/blackfin/kernel/traps.c
- * Based on:
- * Author: Hamish Macdonald
+ * Main exception handling logic.
*
- * Created:
- * Description: uses S/W interrupt 15 for the system calls
+ * Copyright 2004-2010 Analog Devices Inc.
*
- * Modified:
- * Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * Licensed under the GPL-2 or later
*/
#include <linux/bug.h>
#include <linux/uaccess.h>
-#include <linux/interrupt.h>
#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/fs.h>
-#include <linux/rbtree.h>
#include <asm/traps.h>
-#include <asm/cacheflush.h>
#include <asm/cplb.h>
-#include <asm/dma.h>
#include <asm/blackfin.h>
#include <asm/irq_handler.h>
#include <linux/irq.h>
#include <asm/trace.h>
#include <asm/fixed_code.h>
+#include <asm/pseudo_instructions.h>
#ifdef CONFIG_KGDB
# include <linux/kgdb.h>
CSYNC();
}
-static void decode_address(char *buf, unsigned long address)
-{
-#ifdef CONFIG_DEBUG_VERBOSE
- struct task_struct *p;
- struct mm_struct *mm;
- unsigned long flags, offset;
- unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
- struct rb_node *n;
-
-#ifdef CONFIG_KALLSYMS
- unsigned long symsize;
- const char *symname;
- char *modname;
- char *delim = ":";
- char namebuf[128];
-
- /* look up the address and see if we are in kernel space */
- symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
-
- if (symname) {
- /* yeah! kernel space! */
- if (!modname)
- modname = delim = "";
- sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
- (void *)address, delim, modname, delim, symname,
- (unsigned long)offset);
- return;
-
- }
-#endif
-
- /* Problem in fixed code section? */
- if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
- sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
- return;
- }
-
- /* Problem somewhere before the kernel start address */
- if (address < CONFIG_BOOT_LOAD) {
- sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
- return;
- }
-
- /* looks like we're off in user-land, so let's walk all the
- * mappings of all our processes and see if we can't be a whee
- * bit more specific
- */
- write_lock_irqsave(&tasklist_lock, flags);
- for_each_process(p) {
- mm = (in_atomic ? p->mm : get_task_mm(p));
- if (!mm)
- continue;
-
- for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
- struct vm_area_struct *vma;
-
- vma = rb_entry(n, struct vm_area_struct, vm_rb);
-
- if (address >= vma->vm_start && address < vma->vm_end) {
- char _tmpbuf[256];
- char *name = p->comm;
- struct file *file = vma->vm_file;
-
- if (file) {
- char *d_name = d_path(&file->f_path, _tmpbuf,
- sizeof(_tmpbuf));
- if (!IS_ERR(d_name))
- name = d_name;
- }
-
- /* FLAT does not have its text aligned to the start of
- * the map while FDPIC ELF does ...
- */
-
- /* before we can check flat/fdpic, we need to
- * make sure current is valid
- */
- if ((unsigned long)current >= FIXED_CODE_START &&
- !((unsigned long)current & 0x3)) {
- if (current->mm &&
- (address > current->mm->start_code) &&
- (address < current->mm->end_code))
- offset = address - current->mm->start_code;
- else
- offset = (address - vma->vm_start) +
- (vma->vm_pgoff << PAGE_SHIFT);
-
- sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
- (void *)address, name, offset);
- } else
- sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
- (void *)address, name,
- vma->vm_start, vma->vm_end);
-
- if (!in_atomic)
- mmput(mm);
-
- if (!strlen(buf))
- sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
-
- goto done;
- }
- }
- if (!in_atomic)
- mmput(mm);
- }
-
- /* we were unable to find this address anywhere */
- sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
-
-done:
- write_unlock_irqrestore(&tasklist_lock, flags);
-#else
- sprintf(buf, " ");
-#endif
-}
-
-asmlinkage void double_fault_c(struct pt_regs *fp)
-{
-#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
- int j;
- trace_buffer_save(j);
-#endif
-
- console_verbose();
- oops_in_progress = 1;
-#ifdef CONFIG_DEBUG_VERBOSE
- printk(KERN_EMERG "Double Fault\n");
-#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
- if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
- unsigned int cpu = smp_processor_id();
- char buf[150];
- decode_address(buf, cpu_pda[cpu].retx);
- printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
- (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
- decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
- printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
- decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
- printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
-
- decode_address(buf, fp->retx);
- printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
- } else
-#endif
- {
- dump_bfin_process(fp);
- dump_bfin_mem(fp);
- show_regs(fp);
- dump_bfin_trace_buffer();
- }
-#endif
- panic("Double Fault - unrecoverable event");
-
-}
-
static int kernel_mode_regs(struct pt_regs *regs)
{
return regs->ipend & 0xffc0;
}
-asmlinkage void trap_c(struct pt_regs *fp)
+asmlinkage notrace void trap_c(struct pt_regs *fp)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
int j;
#endif
-#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
- unsigned int cpu = smp_processor_id();
+#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
+ int opcode;
#endif
+ unsigned int cpu = raw_smp_processor_id();
const char *strerror = NULL;
int sig = 0;
siginfo_t info;
* double faults if the stack has become corrupt
*/
-#ifndef CONFIG_KGDB
- /* IPEND is skipped if KGDB isn't enabled (see entry code) */
- fp->ipend = bfin_read_IPEND();
-#endif
-
/* trap_c() will be called for exceptions. During exceptions
* processing, the pc value should be set with retx value.
* With this change we can cleanup some code in signal.c- TODO
}
}
#endif
+#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
+ /*
+ * Support for the fake instructions, if the instruction fails,
+ * then just execute a illegal opcode failure (like normal).
+ * Don't support these instructions inside the kernel
+ */
+ if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
+ if (execute_pseudodbg_assert(fp, opcode))
+ goto traps_done;
+ if (execute_pseudodbg(fp, opcode))
+ goto traps_done;
+ }
+#endif
info.si_code = ILL_ILLOPC;
sig = SIGILL;
strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
/* 0x23 - Data CPLB protection violation, handled here */
case VEC_CPLB_VL:
info.si_code = ILL_CPLB_VI;
- sig = SIGBUS;
+ sig = SIGSEGV;
strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
CHK_DEBUGGER_TRAP_MAYBE();
break;
break;
/* External Memory Addressing Error */
case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
+ if (ANOMALY_05000310) {
+ static unsigned long anomaly_rets;
+
+ if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+ (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
+ /*
+ * A false hardware error will happen while fetching at
+ * the L1 instruction SRAM boundary. Ignore it.
+ */
+ anomaly_rets = fp->rets;
+ goto traps_done;
+ } else if (fp->rets == anomaly_rets) {
+ /*
+ * While boundary code returns to a function, at the ret
+ * point, a new false hardware error might occur too based
+ * on tests. Ignore it too.
+ */
+ goto traps_done;
+ } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+ (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
+ /*
+ * If boundary code calls a function, at the entry point,
+ * a new false hardware error maybe happen based on tests.
+ * Ignore it too.
+ */
+ goto traps_done;
+ } else
+ anomaly_rets = 0;
+ }
+
info.si_code = BUS_ADRERR;
sig = SIGBUS;
strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
{
info.si_signo = sig;
info.si_errno = 0;
- info.si_addr = (void __user *)fp->pc;
+ switch (trapnr) {
+ case VEC_CPLB_VL:
+ case VEC_MISALI_D:
+ case VEC_CPLB_M:
+ case VEC_CPLB_MHIT:
+ info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
+ break;
+ default:
+ info.si_addr = (void __user *)fp->pc;
+ break;
+ }
force_sig_info(sig, &info, current);
}
if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
- (ANOMALY_05000281 && trapnr == VEC_HWERR))
+ (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
+ (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
fp->pc = SAFE_USER_INSTRUCTION;
traps_done:
trace_buffer_restore(j);
}
-/* Typical exception handling routines */
-
-#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
-
-/*
- * Similar to get_user, do some address checking, then dereference
- * Return true on sucess, false on bad address
- */
-static bool get_instruction(unsigned short *val, unsigned short *address)
-{
- unsigned long addr = (unsigned long)address;
-
- /* Check for odd addresses */
- if (addr & 0x1)
- return false;
-
- /* MMR region will never have instructions */
- if (addr >= SYSMMR_BASE)
- return false;
-
- switch (bfin_mem_access_type(addr, 2)) {
- case BFIN_MEM_ACCESS_CORE:
- case BFIN_MEM_ACCESS_CORE_ONLY:
- *val = *address;
- return true;
- case BFIN_MEM_ACCESS_DMA:
- dma_memcpy(val, address, 2);
- return true;
- case BFIN_MEM_ACCESS_ITEST:
- isram_memcpy(val, address, 2);
- return true;
- default: /* invalid access */
- return false;
- }
-}
-
-/*
- * decode the instruction if we are printing out the trace, as it
- * makes things easier to follow, without running it through objdump
- * These are the normal instructions which cause change of flow, which
- * would be at the source of the trace buffer
- */
-#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
-static void decode_instruction(unsigned short *address)
-{
- unsigned short opcode;
-
- if (get_instruction(&opcode, address)) {
- if (opcode == 0x0010)
- verbose_printk("RTS");
- else if (opcode == 0x0011)
- verbose_printk("RTI");
- else if (opcode == 0x0012)
- verbose_printk("RTX");
- else if (opcode == 0x0013)
- verbose_printk("RTN");
- else if (opcode == 0x0014)
- verbose_printk("RTE");
- else if (opcode == 0x0025)
- verbose_printk("EMUEXCPT");
- else if (opcode == 0x0040 && opcode <= 0x0047)
- verbose_printk("STI R%i", opcode & 7);
- else if (opcode >= 0x0050 && opcode <= 0x0057)
- verbose_printk("JUMP (P%i)", opcode & 7);
- else if (opcode >= 0x0060 && opcode <= 0x0067)
- verbose_printk("CALL (P%i)", opcode & 7);
- else if (opcode >= 0x0070 && opcode <= 0x0077)
- verbose_printk("CALL (PC+P%i)", opcode & 7);
- else if (opcode >= 0x0080 && opcode <= 0x0087)
- verbose_printk("JUMP (PC+P%i)", opcode & 7);
- else if (opcode >= 0x0090 && opcode <= 0x009F)
- verbose_printk("RAISE 0x%x", opcode & 0xF);
- else if (opcode >= 0x00A0 && opcode <= 0x00AF)
- verbose_printk("EXCPT 0x%x", opcode & 0xF);
- else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
- verbose_printk("IF !CC JUMP");
- else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
- verbose_printk("IF CC JUMP");
- else if (opcode >= 0x2000 && opcode <= 0x2fff)
- verbose_printk("JUMP.S");
- else if (opcode >= 0xe080 && opcode <= 0xe0ff)
- verbose_printk("LSETUP");
- else if (opcode >= 0xe200 && opcode <= 0xe2ff)
- verbose_printk("JUMP.L");
- else if (opcode >= 0xe300 && opcode <= 0xe3ff)
- verbose_printk("CALL pcrel");
- else
- verbose_printk("0x%04x", opcode);
- }
-
-}
-#endif
-
-void dump_bfin_trace_buffer(void)
-{
-#ifdef CONFIG_DEBUG_VERBOSE
-#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
- int tflags, i = 0;
- char buf[150];
- unsigned short *addr;
-#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
- int j, index;
-#endif
-
- trace_buffer_save(tflags);
-
- printk(KERN_NOTICE "Hardware Trace:\n");
-
-#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
- printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
-#endif
-
- 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);
- addr = (unsigned short *)bfin_read_TBUF();
- decode_address(buf, (unsigned long)addr);
- printk(KERN_NOTICE " Source : %s ", buf);
- decode_instruction(addr);
- printk("\n");
- }
- }
-
-#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
- if (trace_buff_offset)
- index = trace_buff_offset / 4;
- 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 ", buf);
- decode_instruction((unsigned short *)software_trace_buff[index]);
- printk("\n");
- index -= 1;
- if (index < 0)
- index = EXPAND_LEN;
- j--;
- i++;
- }
-#endif
-
- trace_buffer_restore(tflags);
-#endif
-#endif
-}
-EXPORT_SYMBOL(dump_bfin_trace_buffer);
-
-#ifdef CONFIG_BUG
-int is_valid_bugaddr(unsigned long addr)
-{
- unsigned short opcode;
-
- if (!get_instruction(&opcode, (unsigned short *)addr))
- return 0;
-
- return opcode == BFIN_BUG_OPCODE;
-}
-#endif
-
-/*
- * Checks to see if the address pointed to is either a
- * 16-bit CALL instruction, or a 32-bit CALL instruction
- */
-static bool is_bfin_call(unsigned short *addr)
-{
- unsigned short opcode = 0, *ins_addr;
- ins_addr = (unsigned short *)addr;
-
- if (!get_instruction(&opcode, ins_addr))
- return false;
-
- if ((opcode >= 0x0060 && opcode <= 0x0067) ||
- (opcode >= 0x0070 && opcode <= 0x0077))
- return true;
-
- ins_addr--;
- if (!get_instruction(&opcode, ins_addr))
- return false;
-
- if (opcode >= 0xE300 && opcode <= 0xE3FF)
- return true;
-
- return false;
-
-}
-
-void show_stack(struct task_struct *task, unsigned long *stack)
-{
-#ifdef CONFIG_PRINTK
- unsigned int *addr, *endstack, *fp = 0, *frame;
- unsigned short *ins_addr;
- char buf[150];
- unsigned int i, j, ret_addr, frame_no = 0;
-
- /*
- * If we have been passed a specific stack, use that one otherwise
- * if we have been passed a task structure, use that, otherwise
- * use the stack of where the variable "stack" exists
- */
-
- if (stack == NULL) {
- if (task) {
- /* We know this is a kernel stack, so this is the start/end */
- stack = (unsigned long *)task->thread.ksp;
- endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
- } else {
- /* print out the existing stack info */
- stack = (unsigned long *)&stack;
- endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
- }
- } else
- endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
-
- printk(KERN_NOTICE "Stack info:\n");
- decode_address(buf, (unsigned int)stack);
- printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
-
- if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
- printk(KERN_NOTICE "Invalid stack pointer\n");
- return;
- }
-
- /* First thing is to look for a frame pointer */
- for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
- if (*addr & 0x1)
- continue;
- ins_addr = (unsigned short *)*addr;
- ins_addr--;
- if (is_bfin_call(ins_addr))
- fp = addr - 1;
-
- if (fp) {
- /* Let's check to see if it is a frame pointer */
- while (fp >= (addr - 1) && fp < endstack
- && fp && ((unsigned int) fp & 0x3) == 0)
- fp = (unsigned int *)*fp;
- if (fp == 0 || fp == endstack) {
- fp = addr - 1;
- break;
- }
- fp = 0;
- }
- }
- if (fp) {
- frame = fp;
- printk(KERN_NOTICE " FP: (0x%p)\n", fp);
- } else
- frame = 0;
-
- /*
- * Now that we think we know where things are, we
- * walk the stack again, this time printing things out
- * incase there is no frame pointer, we still look for
- * valid return addresses
- */
-
- /* First time print out data, next time, print out symbols */
- for (j = 0; j <= 1; j++) {
- if (j)
- printk(KERN_NOTICE "Return addresses in stack:\n");
- else
- printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
-
- fp = frame;
- frame_no = 0;
-
- for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
- addr <= endstack; addr++, i++) {
-
- ret_addr = 0;
- if (!j && i % 8 == 0)
- printk(KERN_NOTICE "%p:",addr);
-
- /* if it is an odd address, or zero, just skip it */
- if (*addr & 0x1 || !*addr)
- goto print;
-
- ins_addr = (unsigned short *)*addr;
-
- /* Go back one instruction, and see if it is a CALL */
- ins_addr--;
- ret_addr = is_bfin_call(ins_addr);
- print:
- if (!j && stack == (unsigned long *)addr)
- printk("[%08x]", *addr);
- else if (ret_addr)
- if (j) {
- decode_address(buf, (unsigned int)*addr);
- if (frame == addr) {
- printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
- continue;
- }
- printk(KERN_NOTICE " address : %s\n", buf);
- } else
- printk("<%08x>", *addr);
- else if (fp == addr) {
- if (j)
- frame = addr+1;
- else
- printk("(%08x)", *addr);
-
- fp = (unsigned int *)*addr;
- frame_no++;
-
- } else if (!j)
- printk(" %08x ", *addr);
- }
- if (!j)
- printk("\n");
- }
-#endif
-}
-
-void dump_stack(void)
+asmlinkage void double_fault_c(struct pt_regs *fp)
{
- unsigned long stack;
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
- int tflags;
+ int j;
+ trace_buffer_save(j);
#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)
-{
+ console_verbose();
+ oops_in_progress = 1;
#ifdef CONFIG_DEBUG_VERBOSE
- /* 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)
- verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
-
- if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
- verbose_printk(KERN_NOTICE "HW Error context\n");
- else if (context & 0x0020)
- verbose_printk(KERN_NOTICE "Deferred Exception context\n");
- else if (context & 0x3FC0)
- verbose_printk(KERN_NOTICE "Interrupt context\n");
- else if (context & 0x4000)
- verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
- else if (context & 0x8000)
- verbose_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) {
- verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
- if (current->comm >= (char *)FIXED_CODE_START)
- verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
- current->comm, current->pid);
- else
- verbose_printk(KERN_NOTICE "COMM= invalid\n");
+ printk(KERN_EMERG "Double Fault\n");
+#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
+ if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
+ unsigned int cpu = raw_smp_processor_id();
+ char buf[150];
+ decode_address(buf, cpu_pda[cpu].retx_doublefault);
+ printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
+ (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
+ decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
+ printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
+ decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
+ printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
- printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
- if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
- verbose_printk(KERN_NOTICE
- "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
- " BSS = 0x%p-0x%p USER-STACK = 0x%p\n\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
- verbose_printk(KERN_NOTICE "invalid mm\n");
+ decode_address(buf, fp->retx);
+ printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
} else
- verbose_printk(KERN_NOTICE
- "No Valid process in current context\n");
-#endif
-}
-
-void dump_bfin_mem(struct pt_regs *fp)
-{
-#ifdef CONFIG_DEBUG_VERBOSE
- unsigned short *addr, *erraddr, val = 0, err = 0;
- char sti = 0, buf[6];
-
- erraddr = (void *)fp->pc;
-
- verbose_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))
- verbose_printk(KERN_NOTICE "0x%p: ", addr);
-
- if (!get_instruction(&val, addr)) {
- val = 0;
- sprintf(buf, "????");
- } else
- sprintf(buf, "%04x", val);
-
- if (addr == erraddr) {
- verbose_printk("[%s]", buf);
- err = val;
- } else
- verbose_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;
- }
-
- verbose_printk("\n");
-
- /* Hardware error interrupts can be deferred */
- if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
- oops_in_progress)){
- verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
-#ifndef CONFIG_DEBUG_HWERR
- verbose_printk(KERN_NOTICE
-"The remaining message may be meaningless\n"
-"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) {
- verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
- verbose_printk(KERN_NOTICE "-------------------------------------------\n");
- show_regs(fp + 1);
- verbose_printk(KERN_NOTICE "-------------------------------------------\n");
- }
- }
#endif
+ {
+ dump_bfin_process(fp);
+ dump_bfin_mem(fp);
+ show_regs(fp);
+ dump_bfin_trace_buffer();
}
#endif
-}
-
-void show_regs(struct pt_regs *fp)
-{
-#ifdef CONFIG_DEBUG_VERBOSE
- char buf [150];
- struct irqaction *action;
- unsigned int i;
- unsigned long flags = 0;
- unsigned int cpu = smp_processor_id();
- unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
-
- verbose_printk(KERN_NOTICE "\n");
- if (CPUID != bfin_cpuid())
- verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
- "but running on:0x%04x (Rev %d)\n",
- CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
-
- verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
- CPU, bfin_compiled_revid());
-
- if (bfin_compiled_revid() != bfin_revid())
- verbose_printk("(Detected 0.%d)", bfin_revid());
-
- verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
- get_cclk()/1000000, get_sclk()/1000000,
-#ifdef CONFIG_MPU
- "mpu on"
-#else
- "mpu off"
-#endif
- );
-
- verbose_printk(KERN_NOTICE "%s", linux_banner);
-
- verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n",
- print_tainted());
- verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
- (long)fp->seqstat, fp->ipend, fp->syscfg);
- if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
- verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
- (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
-#ifdef EBIU_ERRMST
- /* If the error was from the EBIU, print it out */
- if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
- verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n",
- bfin_read_EBIU_ERRMST());
- verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n",
- bfin_read_EBIU_ERRADD());
- }
-#endif
- }
- verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
- fp->seqstat & SEQSTAT_EXCAUSE);
- for (i = 2; i <= 15 ; i++) {
- if (fp->ipend & (1 << i)) {
- if (i != 4) {
- decode_address(buf, bfin_read32(EVT0 + 4*i));
- verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
- } else
- verbose_printk(KERN_NOTICE " interrupts disabled\n");
- }
- }
-
- /* if no interrupts are going off, don't print this out */
- if (fp->ipend & ~0x3F) {
- for (i = 0; i < (NR_IRQS - 1); i++) {
- if (!in_atomic)
- spin_lock_irqsave(&irq_desc[i].lock, flags);
-
- action = irq_desc[i].action;
- if (!action)
- goto unlock;
-
- decode_address(buf, (unsigned int)action->handler);
- verbose_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);
- verbose_printk(", %s", buf);
- }
- verbose_printk("\n");
-unlock:
- if (!in_atomic)
- spin_unlock_irqrestore(&irq_desc[i].lock, flags);
- }
- }
-
- decode_address(buf, fp->rete);
- verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
- decode_address(buf, fp->retn);
- verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
- decode_address(buf, fp->retx);
- verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
- decode_address(buf, fp->rets);
- verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
- decode_address(buf, fp->pc);
- verbose_printk(KERN_NOTICE " PC : %s\n", buf);
-
- if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
- (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
- decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
- verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
- decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
- verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
- }
-
- verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
- verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
- fp->r0, fp->r1, fp->r2, fp->r3);
- verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
- fp->r4, fp->r5, fp->r6, fp->r7);
- verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
- fp->p0, fp->p1, fp->p2, fp->p3);
- verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
- fp->p4, fp->p5, fp->fp, (long)fp);
- verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
- fp->lb0, fp->lt0, fp->lc0);
- verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
- fp->lb1, fp->lt1, fp->lc1);
- verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
- fp->b0, fp->l0, fp->m0, fp->i0);
- verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
- fp->b1, fp->l1, fp->m1, fp->i1);
- verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
- fp->b2, fp->l2, fp->m2, fp->i2);
- verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
- fp->b3, fp->l3, fp->m3, fp->i3);
- verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
- fp->a0w, fp->a0x, fp->a1w, fp->a1x);
-
- verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
- rdusp(), fp->astat);
-
- verbose_printk(KERN_NOTICE "\n");
-#endif
-}
-
-#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
-asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
-#endif
-
-static DEFINE_SPINLOCK(bfin_spinlock_lock);
-
-asmlinkage int sys_bfin_spinlock(int *p)
-{
- int ret, tmp = 0;
-
- spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
- ret = get_user(tmp, p);
- if (likely(ret == 0)) {
- if (unlikely(tmp))
- ret = 1;
- else
- put_user(1, p);
- }
- spin_unlock(&bfin_spinlock_lock);
- 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;
+ panic("Double Fault - unrecoverable event");
- 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)
{
dump_stack();
panic("Unrecoverable event");
}
+
+#ifdef CONFIG_BUG
+int is_valid_bugaddr(unsigned long addr)
+{
+ unsigned int opcode;
+
+ if (!get_instruction(&opcode, (unsigned short *)addr))
+ return 0;
+
+ return opcode == BFIN_BUG_OPCODE;
+}
+#endif
+
+/* stub this out */
+#ifndef CONFIG_DEBUG_VERBOSE
+void show_regs(struct pt_regs *fp)
+{
+
+}
+#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff