arch/arc/include/asm/unwind.h

Source file repositories/reference/linux-study-clean/arch/arc/include/asm/unwind.h

File Facts

System: Linux kernel
Corpus path: arch/arc/include/asm/unwind.h
Extension: .h
Size: 3446 bytes
Lines: 157
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.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/sched.h

Detected Declarations

struct arc700_regs
struct unwind_frame_info
function arch_unwind_init_running
function arch_unw_user_mode
function arch_unw_init_blocked
function arch_unw_init_frame_info
function arc_unwind_init

Annotated Snippet

struct arc700_regs {
	unsigned long r0;
	unsigned long r1;
	unsigned long r2;
	unsigned long r3;
	unsigned long r4;
	unsigned long r5;
	unsigned long r6;
	unsigned long r7;
	unsigned long r8;
	unsigned long r9;
	unsigned long r10;
	unsigned long r11;
	unsigned long r12;
	unsigned long r13;
	unsigned long r14;
	unsigned long r15;
	unsigned long r16;
	unsigned long r17;
	unsigned long r18;
	unsigned long r19;
	unsigned long r20;
	unsigned long r21;
	unsigned long r22;
	unsigned long r23;
	unsigned long r24;
	unsigned long r25;
	unsigned long r26;
	unsigned long r27;	/* fp */
	unsigned long r28;	/* sp */
	unsigned long r29;
	unsigned long r30;
	unsigned long r31;	/* blink */
	unsigned long r63;	/* pc */
};

struct unwind_frame_info {
	struct arc700_regs regs;
	struct task_struct *task;
	unsigned call_frame:1;
};

#define UNW_PC(frame)		((frame)->regs.r63)
#define UNW_SP(frame)		((frame)->regs.r28)
#define UNW_BLINK(frame)	((frame)->regs.r31)

/* Rajesh FIXME */
#ifdef CONFIG_FRAME_POINTER
#define UNW_FP(frame)		((frame)->regs.r27)
#define FRAME_RETADDR_OFFSET	4
#define FRAME_LINK_OFFSET	0
#define STACK_BOTTOM_UNW(tsk)	STACK_LIMIT((tsk)->thread.ksp)
#define STACK_TOP_UNW(tsk)	((tsk)->thread.ksp)
#else
#define UNW_FP(frame)		((void)(frame), 0)
#endif

#define STACK_LIMIT(ptr)	(((ptr) - 1) & ~(THREAD_SIZE - 1))

#define UNW_REGISTER_INFO \
	PTREGS_INFO(r0), \
	PTREGS_INFO(r1), \
	PTREGS_INFO(r2), \
	PTREGS_INFO(r3), \
	PTREGS_INFO(r4), \
	PTREGS_INFO(r5), \
	PTREGS_INFO(r6), \
	PTREGS_INFO(r7), \
	PTREGS_INFO(r8), \
	PTREGS_INFO(r9), \
	PTREGS_INFO(r10), \
	PTREGS_INFO(r11), \
	PTREGS_INFO(r12), \
	PTREGS_INFO(r13), \
	PTREGS_INFO(r14), \
	PTREGS_INFO(r15), \
	PTREGS_INFO(r16), \
	PTREGS_INFO(r17), \
	PTREGS_INFO(r18), \
	PTREGS_INFO(r19), \
	PTREGS_INFO(r20), \
	PTREGS_INFO(r21), \
	PTREGS_INFO(r22), \
	PTREGS_INFO(r23), \
	PTREGS_INFO(r24), \
	PTREGS_INFO(r25), \
	PTREGS_INFO(r26), \
	PTREGS_INFO(r27), \
	PTREGS_INFO(r28), \
	PTREGS_INFO(r29), \

Annotation

Immediate include surface: `linux/sched.h`.
Detected declarations: `struct arc700_regs`, `struct unwind_frame_info`, `function arch_unwind_init_running`, `function arch_unw_user_mode`, `function arch_unw_init_blocked`, `function arch_unw_init_frame_info`, `function arc_unwind_init`.
Atlas domain: Architecture Layer / arch/arc.
Implementation status: source 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.