arch/arm/include/asm/traps.h

File Facts

System

Linux kernel

Corpus path

arch/arm/include/asm/traps.h

Extension

.h

Size

1414 bytes

Lines

49

Domain

Architecture Layer

Bucket

arch/arm

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/linkage.h
• linux/list.h

Detected Declarations

• struct pt_regs
• struct task_struct
• struct undef_hook
• function __in_irqentry_text

Annotated Snippet

struct undef_hook {
	struct list_head node;
	u32 instr_mask;
	u32 instr_val;
	u32 cpsr_mask;
	u32 cpsr_val;
	int (*fn)(struct pt_regs *regs, unsigned int instr);
};

void register_undef_hook(struct undef_hook *hook);
void unregister_undef_hook(struct undef_hook *hook);

static inline int __in_irqentry_text(unsigned long ptr)
{
	extern char __irqentry_text_start[];
	extern char __irqentry_text_end[];

	return ptr >= (unsigned long)&__irqentry_text_start &&
	       ptr < (unsigned long)&__irqentry_text_end;
}

extern void early_trap_init(void *);
extern void dump_backtrace_entry(unsigned long where, unsigned long from,
				 unsigned long frame, const char *loglvl);
extern void ptrace_break(struct pt_regs *regs);

extern void *vectors_page;

asmlinkage void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl);
asmlinkage void do_undefinstr(struct pt_regs *regs);
asmlinkage void handle_fiq_as_nmi(struct pt_regs *regs);
asmlinkage void bad_mode(struct pt_regs *regs, int reason);
asmlinkage int arm_syscall(int no, struct pt_regs *regs);
asmlinkage void baddataabort(int code, unsigned long instr, struct pt_regs *regs);
asmlinkage void __div0(void);
asmlinkage void handle_bad_stack(struct pt_regs *regs);

#endif

Annotation

• Immediate include surface: `linux/linkage.h`, `linux/list.h`.
• Detected declarations: `struct pt_regs`, `struct task_struct`, `struct undef_hook`, `function __in_irqentry_text`.
• Atlas domain: Architecture Layer / arch/arm.
• 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.