patch-2.2.18 linux/arch/arm/kernel/traps.c
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- Lines: 391
- Date:
Fri Sep 15 23:28:37 2000
- Orig file:
v2.2.17/arch/arm/kernel/traps.c
- Orig date:
Fri Apr 21 12:45:45 2000
diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/kernel/traps.c linux/arch/arm/kernel/traps.c
@@ -24,7 +24,6 @@
#include <asm/atomic.h>
#include <asm/pgtable.h>
-extern void die_if_kernel(char *str, struct pt_regs *regs, int err, int ret);
extern void c_backtrace (unsigned long fp, int pmode);
extern int ptrace_cancel_bpt (struct task_struct *);
@@ -45,16 +44,17 @@
int kstack_depth_to_print = 200;
-static int verify_stack_pointer (unsigned long stackptr, int size)
+/*
+ * Stack pointers should always be within the kernels view of
+ * physical memory. If it is not there, then we can't dump
+ * out any information relating to the stack.
+ */
+static int verify_stack(unsigned long sp)
{
-#ifdef CONFIG_CPU_26
- if (stackptr < 0x02048000 || stackptr + size > 0x03000000)
- return -EFAULT;
-#else
- if (stackptr < PAGE_OFFSET || stackptr + size > (unsigned long)high_memory)
+ if (sp < PAGE_OFFSET || sp > (unsigned long)high_memory)
return -EFAULT;
-#endif
- return 0;
+
+ return 0;
}
/*
@@ -90,22 +90,26 @@
static void dump_instr(unsigned long pc, int user)
{
- unsigned long module_start, module_end;
int pmin = -2, pmax = 3, ok = 0;
extern char start_kernel, _etext;
if (!user) {
+ unsigned long module_start, module_end;
+ unsigned long kernel_start, kernel_end;
+
module_start = VMALLOC_START;
module_end = module_start + MODULE_RANGE;
- if ((pc >= (unsigned long) &start_kernel) &&
- (pc <= (unsigned long) &_etext)) {
- if (pc + pmin < (unsigned long) &start_kernel)
- pmin = ((unsigned long) &start_kernel) - pc;
- if (pc + pmax > (unsigned long) &_etext)
- pmax = ((unsigned long) &_etext) - pc;
+ kernel_start = (unsigned long)&start_kernel;
+ kernel_end = (unsigned long)&_etext;
+
+ if (pc >= kernel_start && pc < kernel_end) {
+ if (pc + pmin < kernel_start)
+ pmin = kernel_start - pc;
+ if (pc + pmax > kernel_end)
+ pmax = kernel_end - pc;
ok = 1;
- } else if (pc >= module_start && pc <= module_end) {
+ } else if (pc >= module_start && pc < module_end) {
if (pc + pmin < module_start)
pmin = module_start - pc;
if (pc + pmax > module_end)
@@ -125,119 +129,139 @@
printk ("pc not in code space\n");
}
-static void dump_state(char *str, struct pt_regs *regs, int err)
+spinlock_t die_lock;
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
{
+ struct task_struct *tsk = current;
+
+ spin_lock_irq(&die_lock);
+
console_verbose();
printk("Internal error: %s: %x\n", str, err);
printk("CPU: %d\n", smp_processor_id());
show_regs(regs);
printk("Process %s (pid: %d, stackpage=%08lx)\n",
- current->comm, current->pid, 4096+(unsigned long)current);
-}
+ current->comm, current->pid, 4096+(unsigned long)tsk);
-/*
- * This function is protected against kernel-mode re-entrancy. If it
- * is re-entered it will hang the system since we can't guarantee in
- * this case that any of the functions that it calls are safe any more.
- * Even the panic function could be a problem, but we'll give it a go.
- */
-void die_if_kernel(char *str, struct pt_regs *regs, int err, int ret)
-{
- static int died = 0;
- unsigned long cstack, sstack, frameptr;
-
- if (user_mode(regs))
- return;
+ if (!user_mode(regs)) {
+ unsigned long sp = (unsigned long)(regs + 1);
+ unsigned long fp;
+ int dump_info = 1;
+
+ printk("Stack: ");
+ if (verify_stack(sp)) {
+ printk("invalid kernel stack pointer %08lx", sp);
+ dump_info = 0;
+ } else if (sp < 4096+(unsigned long)tsk)
+ printk("kernel stack pointer underflow");
+ printk("\n");
+
+ if (dump_info)
+ dump_mem(sp - 16, 8192+(unsigned long)tsk);
+
+ dump_info = 1;
+
+ printk("Backtrace: ");
+ fp = regs->ARM_fp;
+ if (!fp) {
+ printk("no frame pointer");
+ dump_info = 0;
+ } else if (verify_stack(fp)) {
+ printk("invalid frame pointer %08lx", fp);
+ dump_info = 0;
+ } else if (fp < 4096+(unsigned long)tsk)
+ printk("frame pointer underflow");
+ printk("\n");
- switch (died) {
- case 2:
- while (1);
- case 1:
- died ++;
- panic ("die_if_kernel re-entered. Major kernel corruption. Please reboot me!");
- break;
- case 0:
- died ++;
- break;
- }
+ if (dump_info)
+ c_backtrace(fp, processor_mode(regs));
- dump_state(str, regs, err);
+ dump_instr(instruction_pointer(regs), 0);
+ }
- cstack = (unsigned long)(regs + 1);
- sstack = 4096+(unsigned long)current;
+ spin_unlock_irq(&die_lock);
+ do_exit(SIGSEGV);
+}
- printk("Stack: ");
- if (verify_stack_pointer(cstack, 4))
- printk("invalid kernel stack pointer %08lx", cstack);
- else if(cstack > sstack + 4096)
- printk("(sp overflow)");
- else if(cstack < sstack)
- printk("(sp underflow)");
- printk("\n");
-
- dump_mem(cstack - 16, sstack + 4096);
-
- frameptr = regs->ARM_fp;
- if (frameptr) {
- if (verify_stack_pointer (frameptr, 4))
- printk ("Backtrace: invalid frame pointer\n");
- else {
- printk("Backtrace: \n");
- c_backtrace (frameptr, processor_mode(regs));
- }
- }
+static void die_if_kernel(const char *str, struct pt_regs *regs, int err)
+{
+ if (user_mode(regs))
+ return;
- dump_instr(instruction_pointer(regs), 0);
- died = 0;
- if (ret != -1)
- do_exit (ret);
- else {
- cli ();
- while (1);
- }
+ die(str, regs, err);
}
-void bad_user_access_alignment (const void *ptr)
+void bad_user_access_alignment(const void *ptr)
{
- void *pc;
- __asm__("mov %0, lr\n": "=r" (pc));
- printk (KERN_ERR "bad_user_access_alignment called: ptr = %p, pc = %p\n", ptr, pc);
+ printk(KERN_ERR "bad user access alignment: ptr = %p, pc = %p\n", ptr,
+ __builtin_return_address(0));
current->tss.error_code = 0;
current->tss.trap_no = 11;
- force_sig (SIGBUS, current);
-/* die_if_kernel("Oops - bad user access alignment", regs, mode, SIGBUS);*/
+ force_sig(SIGBUS, current);
+/* die_if_kernel("Oops - bad user access alignment", regs, mode);*/
}
-asmlinkage void do_undefinstr (int address, struct pt_regs *regs, int mode)
+asmlinkage void do_undefinstr(int address, struct pt_regs *regs, int mode)
{
+#ifdef CONFIG_DEBUG_USER
+ printk(KERN_INFO "%s (%d): undefined instruction: pc=%08lx\n",
+ current->comm, current->pid, instruction_pointer(regs));
+#endif
current->tss.error_code = 0;
current->tss.trap_no = 6;
- force_sig (SIGILL, current);
- die_if_kernel("Oops - undefined instruction", regs, mode, SIGILL);
+ force_sig(SIGILL, current);
+ die_if_kernel("Oops - undefined instruction", regs, mode);
}
-asmlinkage void do_excpt (int address, struct pt_regs *regs, int mode)
+asmlinkage void do_excpt(int address, struct pt_regs *regs, int mode)
{
+#ifdef CONFIG_DEBUG_USER
+ printk(KERN_INFO "%s (%d): address exception: pc=%08lx\n",
+ current->comm, current->pid, instruction_pointer(regs));
+#endif
current->tss.error_code = 0;
current->tss.trap_no = 11;
- force_sig (SIGBUS, current);
- die_if_kernel("Oops - address exception", regs, mode, SIGBUS);
+ force_sig(SIGBUS, current);
+ die_if_kernel("Oops - address exception", regs, mode);
}
asmlinkage void do_unexp_fiq (struct pt_regs *regs)
{
#ifndef CONFIG_IGNORE_FIQ
- printk ("Hmm. Unexpected FIQ received, but trying to continue\n");
- printk ("You may have a hardware problem...\n");
+ printk("Hmm. Unexpected FIQ received, but trying to continue\n");
+ printk("You may have a hardware problem...\n");
#endif
}
+/*
+ * bad_mode handles the impossible case in the vectors.
+ * If you see one of these, then it's extremely serious,
+ * and could mean you have buggy hardware. It never
+ * returns, and never tries to sync. We hope that we
+ * can dump out some state information...
+ */
asmlinkage void bad_mode(struct pt_regs *regs, int reason, int proc_mode)
{
- printk (KERN_CRIT "Bad mode in %s handler detected: mode %s\n",
- handler[reason],
- processor_modes[proc_mode]);
- die_if_kernel ("Oops", regs, 0, -1);
+ console_verbose();
+
+ printk(KERN_CRIT "Bad mode in %s handler detected: mode %s\n",
+ handler[reason], processor_modes[proc_mode]);
+
+ /*
+ * Dump out the vectors and stub routines
+ */
+ printk(KERN_CRIT "Vectors:\n");
+ dump_mem(0, 0x40);
+ printk(KERN_CRIT "Stubs:\n");
+ dump_mem(0x200, 0x4b8);
+
+ die("Oops", regs, 0);
+ cli();
+ while(1);
}
/*
@@ -249,54 +273,85 @@
*/
asmlinkage void math_state_restore (void)
{
- current->used_math = 1;
+ current->used_math = 1;
}
-asmlinkage void arm_syscall (int no, struct pt_regs *regs)
+asmlinkage int arm_syscall (int no, struct pt_regs *regs)
{
switch (no) {
case 0: /* branch through 0 */
force_sig(SIGSEGV, current);
-// if (user_mode(regs)) {
-// dump_state("branch through zero", regs, 0);
-// if (regs->ARM_fp)
-// c_backtrace (regs->ARM_fp, processor_mode(regs));
-// }
- die_if_kernel ("branch through zero", regs, 0, SIGSEGV);
+ die_if_kernel("branch through zero", regs, 0);
break;
case 1: /* SWI_BREAK_POINT */
regs->ARM_pc -= 4; /* Decrement PC by one instruction */
- ptrace_cancel_bpt (current);
- force_sig (SIGTRAP, current);
+ ptrace_cancel_bpt(current);
+ force_sig(SIGTRAP, current);
+ return regs->ARM_r0;
+
+ case 2: /* sys_cacheflush */
+#ifdef CONFIG_CPU_32
+ /* r0 = start, r1 = length, r2 = flags */
+ processor.u.armv3v4._flush_cache_area(regs->ARM_r0,
+ regs->ARM_r1,
+ 1);
+#endif
break;
default:
- printk ("[%d] %s: arm syscall %d\n", current->pid, current->comm, no);
- force_sig (SIGILL, current);
+ /* Calls 9f00xx..9f07ff are defined to return -ENOSYS
+ if not implemented, rather than raising SIGILL. This
+ way the calling program can gracefully determine whether
+ a feature is supported. */
+ if (no <= 0x7ff)
+ return -ENOSYS;
+#ifdef CONFIG_DEBUG_USER
+ /* experiance shows that these seem to indicate that
+ * something catastrophic has happened
+ */
+ printk("[%d] %s: arm syscall %d\n", current->pid, current->comm, no);
if (user_mode(regs)) {
- show_regs (regs);
- c_backtrace (regs->ARM_fp, processor_mode(regs));
+ show_regs(regs);
+ c_backtrace(regs->ARM_fp, processor_mode(regs));
}
- die_if_kernel ("Oops", regs, no, SIGILL);
+#endif
+ force_sig(SIGILL, current);
+ die_if_kernel("Oops", regs, no);
break;
}
+ return 0;
}
asmlinkage void deferred(int n, struct pt_regs *regs)
{
- dump_state("old system call", regs, n);
- force_sig (SIGILL, current);
+ /* You might think just testing `handler' would be enough, but PER_LINUX
+ * points it to no_lcall7 to catch undercover SVr4 binaries. Gutted.
+ */
+ if (current->personality != PER_LINUX && current->exec_domain->handler) {
+ /* Hand it off to iBCS. The extra parameter and consequent type
+ * forcing is necessary because of the weird ARM calling convention.
+ */
+ void (*handler)(int nr, struct pt_regs *regs) = (void *)current->exec_domain->handler;
+ (*handler)(n, regs);
+ return;
+ }
+
+#ifdef CONFIG_DEBUG_USER
+ printk(KERN_ERR "[%d] %s: old system call.\n", current->pid,
+ current->comm);
+#endif
+ force_sig(SIGILL, current);
}
asmlinkage void arm_malalignedptr(const char *str, void *pc, volatile void *ptr)
{
- printk ("Mal-aligned pointer in %s: %p (PC=%p)\n", str, ptr, pc);
+ printk("Mal-aligned pointer in %s: %p (PC=%p)\n", str, ptr, pc);
}
-asmlinkage void arm_invalidptr (const char *function, int size)
+asmlinkage void arm_invalidptr(const char *function, int size)
{
- printk ("Invalid pointer size in %s (PC=%p) size %d\n",
+ printk("Invalid pointer size in %s (pc=%p) size %d\n",
function, __builtin_return_address(0), size);
}
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