diff options
Diffstat (limited to 'arch/blackfin/kernel/dumpstack.c')
| -rw-r--r-- | arch/blackfin/kernel/dumpstack.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/arch/blackfin/kernel/dumpstack.c b/arch/blackfin/kernel/dumpstack.c deleted file mode 100644 index 3c992c1f8ef2..000000000000 --- a/arch/blackfin/kernel/dumpstack.c +++ /dev/null @@ -1,177 +0,0 @@ -/* Provide basic stack dumping functions - * - * Copyright 2004-2009 Analog Devices Inc. - * - * Licensed under the GPL-2 or later - */ - -#include <linux/kernel.h> -#include <linux/thread_info.h> -#include <linux/mm.h> -#include <linux/uaccess.h> -#include <linux/module.h> -#include <linux/sched/debug.h> - -#include <asm/trace.h> - -/* - * 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 int opcode; - - if (!get_instruction(&opcode, addr)) - return false; - - if ((opcode >= 0x0060 && opcode <= 0x0067) || - (opcode >= 0x0070 && opcode <= 0x0077) || - (opcode >= 0xE3000000 && opcode <= 0xE3FFFFFF)) - 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 -} -EXPORT_SYMBOL(show_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(); - dump_stack_print_info(KERN_DEFAULT); - show_stack(current, &stack); - trace_buffer_restore(tflags); -} -EXPORT_SYMBOL(dump_stack); |