arch/sh/kernel/stacktrace.c
Source file repositories/reference/linux-study-clean/arch/sh/kernel/stacktrace.c
File Facts
- System
- Linux kernel
- Corpus path
arch/sh/kernel/stacktrace.c- Extension
.c- Size
- 1755 bytes
- Lines
- 80
- Domain
- Architecture Layer
- Bucket
- arch/sh
- Inferred role
- Architecture Layer: exported/initcall integration point
- Status
- integration implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/sched.hlinux/sched/debug.hlinux/stacktrace.hlinux/thread_info.hlinux/module.hasm/unwinder.hasm/ptrace.hasm/stacktrace.h
Detected Declarations
function Copyrightfunction save_stack_tracefunction save_stack_address_noschedfunction save_stack_trace_tskexport save_stack_traceexport save_stack_trace_tsk
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/*
* arch/sh/kernel/stacktrace.c
*
* Stack trace management functions
*
* Copyright (C) 2006 - 2008 Paul Mundt
*/
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
#include <linux/module.h>
#include <asm/unwinder.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.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;
}
static const struct stacktrace_ops save_stack_ops = {
.address = save_stack_address,
};
void save_stack_trace(struct stack_trace *trace)
{
unsigned long *sp = (unsigned long *)current_stack_pointer;
unwind_stack(current, NULL, sp, &save_stack_ops, trace);
}
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;
}
static const struct stacktrace_ops save_stack_ops_nosched = {
.address = save_stack_address_nosched,
};
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
unsigned long *sp = (unsigned long *)tsk->thread.sp;
unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
Annotation
- Immediate include surface: `linux/sched.h`, `linux/sched/debug.h`, `linux/stacktrace.h`, `linux/thread_info.h`, `linux/module.h`, `asm/unwinder.h`, `asm/ptrace.h`, `asm/stacktrace.h`.
- Detected declarations: `function Copyright`, `function save_stack_trace`, `function save_stack_address_nosched`, `function save_stack_trace_tsk`, `export save_stack_trace`, `export save_stack_trace_tsk`.
- Atlas domain: Architecture Layer / arch/sh.
- Implementation status: integration implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.