arch/arc/kernel/ptrace.c

Source file repositories/reference/linux-study-clean/arch/arc/kernel/ptrace.c

File Facts

System: Linux kernel
Corpus path: arch/arc/kernel/ptrace.c
Extension: .c
Size: 10624 bytes
Lines: 402
Domain: Architecture Layer
Bucket: arch/arc
Inferred role: Architecture Layer: implementation source
Status: source 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.
Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/ptrace.h
linux/sched/task_stack.h
linux/regset.h
linux/unistd.h
linux/elf.h
trace/events/syscalls.h

Detected Declarations

struct pt_regs_offset
enum arc_getset
function genregs_get
function genregs_set
function arcv2regs_get
function arcv2regs_set
function ptrace_disable
function syscall_trace_enter
function syscall_trace_exit
function regs_query_register_offset
function regs_within_kernel_stack
function regs_get_kernel_stack_nth

Annotated Snippet

struct pt_regs_offset {
	const char *name;
	int offset;
};

#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define REG_OFFSET_END {.name = NULL, .offset = 0}

#ifdef CONFIG_ISA_ARCOMPACT
static const struct pt_regs_offset regoffset_table[] = {
	REG_OFFSET_NAME(bta),
	REG_OFFSET_NAME(lp_start),
	REG_OFFSET_NAME(lp_end),
	REG_OFFSET_NAME(lp_count),
	REG_OFFSET_NAME(status32),
	REG_OFFSET_NAME(ret),
	REG_OFFSET_NAME(blink),
	REG_OFFSET_NAME(fp),
	REG_OFFSET_NAME(r26),
	REG_OFFSET_NAME(r12),
	REG_OFFSET_NAME(r11),
	REG_OFFSET_NAME(r10),
	REG_OFFSET_NAME(r9),
	REG_OFFSET_NAME(r8),
	REG_OFFSET_NAME(r7),
	REG_OFFSET_NAME(r6),
	REG_OFFSET_NAME(r5),
	REG_OFFSET_NAME(r4),
	REG_OFFSET_NAME(r3),
	REG_OFFSET_NAME(r2),
	REG_OFFSET_NAME(r1),
	REG_OFFSET_NAME(r0),
	REG_OFFSET_NAME(sp),
	REG_OFFSET_NAME(orig_r0),
	REG_OFFSET_NAME(ecr),
	REG_OFFSET_END,
};

#else

static const struct pt_regs_offset regoffset_table[] = {
	REG_OFFSET_NAME(orig_r0),
	REG_OFFSET_NAME(ecr),
	REG_OFFSET_NAME(bta),
	REG_OFFSET_NAME(r26),
	REG_OFFSET_NAME(fp),
	REG_OFFSET_NAME(sp),
	REG_OFFSET_NAME(r12),
	REG_OFFSET_NAME(r30),
#ifdef CONFIG_ARC_HAS_ACCL_REGS
	REG_OFFSET_NAME(r58),
	REG_OFFSET_NAME(r59),
#endif
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
	REG_OFFSET_NAME(DSP_CTRL),
#endif
	REG_OFFSET_NAME(r0),
	REG_OFFSET_NAME(r1),
	REG_OFFSET_NAME(r2),
	REG_OFFSET_NAME(r3),
	REG_OFFSET_NAME(r4),
	REG_OFFSET_NAME(r5),
	REG_OFFSET_NAME(r6),
	REG_OFFSET_NAME(r7),
	REG_OFFSET_NAME(r8),
	REG_OFFSET_NAME(r9),
	REG_OFFSET_NAME(r10),
	REG_OFFSET_NAME(r11),
	REG_OFFSET_NAME(blink),
	REG_OFFSET_NAME(lp_end),
	REG_OFFSET_NAME(lp_start),
	REG_OFFSET_NAME(lp_count),
	REG_OFFSET_NAME(ei),
	REG_OFFSET_NAME(ldi),
	REG_OFFSET_NAME(jli),
	REG_OFFSET_NAME(ret),
	REG_OFFSET_NAME(status32),
	REG_OFFSET_END,
};
#endif

static struct callee_regs *task_callee_regs(struct task_struct *tsk)
{
	struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
	return tmp;
}

static int genregs_get(struct task_struct *target,
		       const struct user_regset *regset,
		       struct membuf to)

Annotation

Immediate include surface: `linux/ptrace.h`, `linux/sched/task_stack.h`, `linux/regset.h`, `linux/unistd.h`, `linux/elf.h`, `trace/events/syscalls.h`.
Detected declarations: `struct pt_regs_offset`, `enum arc_getset`, `function genregs_get`, `function genregs_set`, `function arcv2regs_get`, `function arcv2regs_set`, `function ptrace_disable`, `function syscall_trace_enter`, `function syscall_trace_exit`, `function regs_query_register_offset`.
Atlas domain: Architecture Layer / arch/arc.
Implementation status: source implementation candidate.
This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.