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