[PATCH] ARM: showregs

Fix show_regs() to provide a backtrace. Provide a new __show_regs()
function which implements the common subset of show_regs() and die().
Add prototypes to asm-arm/system.h

Signed-off-by: Russell King <[e-mail]>

arch/arm/kernel/process.c

···
 
 EXPORT_SYMBOL(machine_restart);
 
-void show_regs(struct pt_regs * regs)
+void __show_regs(struct pt_regs *regs)
 {
-	unsigned long flags;
+	unsigned long flags = condition_codes(regs);
 
-	flags = condition_codes(regs);
-
+	printk("CPU: %d\n", smp_processor_id());
 	print_symbol("PC is at %s\n", instruction_pointer(regs));
 	print_symbol("LR is at %s\n", regs->ARM_lr);
 	printk("pc : [<%08lx>]    lr : [<%08lx>]    %s\n"
···
 		printk("Control: %04X  Table: %08X  DAC: %08X\n",
 		  	ctrl, transbase, dac);
 	}
+}
+
+void show_regs(struct pt_regs * regs)
+{
+	printk("\n");
+	printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
+	__show_regs(regs);
+	__backtrace();
 }
 
 void show_fpregs(struct user_fp *regs)

arch/arm/kernel/traps.c

···
 
 #include "ptrace.h"
 
-extern void c_backtrace (unsigned long fp, int pmode);
-extern void show_pte(struct mm_struct *mm, unsigned long addr);
-
 const char *processor_modes[]=
 { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
   "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
···
 
 	printk("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
 	print_modules();
-	printk("CPU: %d\n", smp_processor_id());
-	show_regs(regs);
+	__show_regs(regs);
 	printk("Process %s (pid: %d, stack limit = 0x%p)\n",
 		tsk->comm, tsk->pid, tsk->thread_info + 1);
 
···
 		       current->pid, current->comm, no);
 		dump_instr(regs);
 		if (user_mode(regs)) {
-			show_regs(regs);
+			__show_regs(regs);
 			c_backtrace(regs->ARM_fp, processor_mode(regs));
 		}
 	}

include/asm-arm/ptrace.h

···
 #endif
 
 #ifdef __KERNEL__
-extern void show_regs(struct pt_regs *);
-
-#define predicate(x)	(x & 0xf0000000)
+#define predicate(x)		((x) & 0xf0000000)
 #define PREDICATE_ALWAYS	0xe0000000
-
 #endif
 
 #endif /* __ASSEMBLY__ */

include/asm-arm/system.h

···
 #define tas(ptr) (xchg((ptr),1))
 
 extern asmlinkage void __backtrace(void);
+extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
+extern void show_pte(struct mm_struct *mm, unsigned long addr);
+extern void __show_regs(struct pt_regs *);
 
 extern int cpu_architecture(void);