forked from luck/tmp_suning_uos_patched
24b45a12c2
This is working implemetation but the problem is that Microblaze misses frame pointer that's why is there big loop which trace and show all addresses which are in text. It shows addresses which are in registers, etc. This is problem and this is the reason why all Microblaze traces are wrong. There is an option to do hacks and trace the kernel code but this is too complicated. Signed-off-by: Michal Simek <monstr@monstr.eu>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/*
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* Stack trace support for Microblaze.
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*
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* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009 PetaLogix
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <linux/ptrace.h>
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#include <linux/module.h>
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/* FIXME initial support */
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long *sp;
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unsigned long addr;
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asm("addik %0, r1, 0" : "=r" (sp));
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while (!kstack_end(sp)) {
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addr = *sp++;
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if (__kernel_text_address(addr)) {
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = addr;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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unsigned int *sp;
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unsigned long addr;
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struct thread_info *ti = task_thread_info(tsk);
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if (tsk == current)
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asm("addik %0, r1, 0" : "=r" (sp));
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else
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sp = (unsigned int *)ti->cpu_context.r1;
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while (!kstack_end(sp)) {
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addr = *sp++;
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if (__kernel_text_address(addr)) {
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if (trace->skip > 0)
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trace->skip--;
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else
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trace->entries[trace->nr_entries++] = addr;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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