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linux
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stacktrace.c
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/* * Stack tracing support * * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/kernel.h> #include <linux/export.h> #include <linux/ftrace.h> #include <linux/sched.h> #include <linux/sched/debug.h> #include <linux/sched/task_stack.h> #include <linux/stacktrace.h> #include <asm/irq.h> #include <asm/stack_pointer.h> #include <asm/stacktrace.h> /* * AArch64 PCS assigns the frame pointer to x29. * * A simple function prologue looks like this: * sub sp, sp, #0x10 * stp x29, x30, [sp] * mov x29, sp * * A simple function epilogue looks like this: * mov sp, x29 * ldp x29, x30, [sp] * add sp, sp, #0x10 */ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame) { unsigned long fp = frame->fp; if (fp & 0xf) return -EINVAL; if (!tsk) tsk = current; /* * Switching between stacks is valid when tracing current and in * non-preemptible context. */ if (!(tsk == current && !preemptible() && on_irq_stack(fp)) && !on_task_stack(tsk, fp)) return -EINVAL; frame->sp = fp + 0x10; frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp)); frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 8)); #ifdef CONFIG_FUNCTION_GRAPH_TRACER if (tsk->ret_stack && (frame->pc == (unsigned long)return_to_handler)) { /* * This is a case where function graph tracer has * modified a return address (LR) in a stack frame * to hook a function return. * So replace it to an original value. */ frame->pc = tsk->ret_stack[frame->graph--].ret; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ /* * Check whether we are going to walk through from interrupt stack * to task stack. * If we reach the end of the stack - and its an interrupt stack, * unpack the dummy frame to find the original elr. * * Check the frame->fp we read from the bottom of the irq_stack, * and the original task stack pointer are both in current->stack. */ if (frame->sp == IRQ_STACK_PTR()) { struct pt_regs *irq_args; unsigned long orig_sp = IRQ_STACK_TO_TASK_STACK(frame->sp); if (object_is_on_stack((void *)orig_sp) && object_is_on_stack((void *)frame->fp)) { frame->sp = orig_sp; /* orig_sp is the saved pt_regs, find the elr */ irq_args = (struct pt_regs *)orig_sp; frame->pc = irq_args->pc; } else { /* * This frame has a non-standard format, and we * didn't fix it, because the data looked wrong. * Refuse to output this frame. */ return -EINVAL; } } return 0; } void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame, int (*fn)(struct stackframe *, void *), void *data) { while (1) { int ret; if (fn(frame, data)) break; ret = unwind_frame(tsk, frame); if (ret < 0) break; } } #ifdef CONFIG_STACKTRACE struct stack_trace_data { struct stack_trace *trace; unsigned int no_sched_functions; unsigned int skip; }; static int save_trace(struct stackframe *frame, void *d) { struct stack_trace_data *data = d; struct stack_trace *trace = data->trace; unsigned long addr = frame->pc; if (data->no_sched_functions && in_sched_functions(addr)) return 0; if (data->skip) { data->skip--; return 0; } trace->entries[trace->nr_entries++] = addr; return trace->nr_entries >= trace->max_entries; } void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) { struct stack_trace_data data; struct stackframe frame; data.trace = trace; data.skip = trace->skip; data.no_sched_functions = 0; frame.fp = regs->regs[29]; frame.sp = regs->sp; frame.pc = regs->pc; #ifdef CONFIG_FUNCTION_GRAPH_TRACER frame.graph = current->curr_ret_stack; #endif walk_stackframe(current, &frame, save_trace, &data); if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; } void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) { struct stack_trace_data data; struct stackframe frame; if (!try_get_task_stack(tsk)) return; data.trace = trace; data.skip = trace->skip; if (tsk != current) { data.no_sched_functions = 1; frame.fp = thread_saved_fp(tsk); frame.sp = thread_saved_sp(tsk); frame.pc = thread_saved_pc(tsk); } else { data.no_sched_functions = 0; frame.fp = (unsigned long)__builtin_frame_address(0); frame.sp = current_stack_pointer; frame.pc = (unsigned long)save_stack_trace_tsk; } #ifdef CONFIG_FUNCTION_GRAPH_TRACER frame.graph = tsk->curr_ret_stack; #endif walk_stackframe(tsk, &frame, save_trace, &data); if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; put_task_stack(tsk); } EXPORT_SYMBOL_GPL(save_stack_trace_tsk); void save_stack_trace(struct stack_trace *trace) { save_stack_trace_tsk(current, trace); } EXPORT_SYMBOL_GPL(save_stack_trace); #endif
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