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100 lines
2.1 KiB
100 lines
2.1 KiB
/* |
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* Stack trace utility for OpenRISC |
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* |
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* Copyright (C) 2017 Stafford Horne <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public License |
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* version 2. This program is licensed "as is" without any warranty of any |
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* kind, whether express or implied. |
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* |
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* Losely based on work from sh and powerpc. |
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*/ |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/stacktrace.h> |
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#include <asm/processor.h> |
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#include <asm/unwinder.h> |
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/* |
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* Save stack-backtrace addresses into a stack_trace buffer. |
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*/ |
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static void |
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save_stack_address(void *data, unsigned long addr, int reliable) |
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{ |
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struct stack_trace *trace = data; |
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if (!reliable) |
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return; |
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if (trace->skip > 0) { |
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trace->skip--; |
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return; |
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} |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = addr; |
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} |
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void save_stack_trace(struct stack_trace *trace) |
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{ |
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unwind_stack(trace, (unsigned long *) &trace, save_stack_address); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace); |
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static void |
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save_stack_address_nosched(void *data, unsigned long addr, int reliable) |
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{ |
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struct stack_trace *trace = (struct stack_trace *)data; |
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if (!reliable) |
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return; |
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if (in_sched_functions(addr)) |
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return; |
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if (trace->skip > 0) { |
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trace->skip--; |
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return; |
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} |
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if (trace->nr_entries < trace->max_entries) |
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trace->entries[trace->nr_entries++] = addr; |
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} |
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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 long *sp = NULL; |
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if (!try_get_task_stack(tsk)) |
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return; |
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if (tsk == current) |
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sp = (unsigned long *) &sp; |
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else { |
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unsigned long ksp; |
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/* Locate stack from kernel context */ |
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ksp = task_thread_info(tsk)->ksp; |
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ksp += STACK_FRAME_OVERHEAD; /* redzone */ |
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ksp += sizeof(struct pt_regs); |
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sp = (unsigned long *) ksp; |
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} |
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unwind_stack(trace, sp, save_stack_address_nosched); |
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put_task_stack(tsk); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
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void |
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save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) |
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{ |
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unwind_stack(trace, (unsigned long *) regs->sp, |
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save_stack_address_nosched); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_regs);
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