arch/riscv/include/asm/compat.h

File Facts

System

Linux kernel

Corpus path

arch/riscv/include/asm/compat.h

Extension

.h

Size

4152 bytes

Lines

148

Domain

Architecture Layer

Bucket

arch/riscv

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/types.h
• linux/sched.h
• asm-generic/compat.h

Detected Declarations

• struct compat_user_regs_struct
• function is_compat_task
• function is_compat_thread
• function set_compat_task
• function regs_to_cregs
• function cregs_to_regs

Annotated Snippet

struct compat_user_regs_struct {
	compat_ulong_t pc;
	compat_ulong_t ra;
	compat_ulong_t sp;
	compat_ulong_t gp;
	compat_ulong_t tp;
	compat_ulong_t t0;
	compat_ulong_t t1;
	compat_ulong_t t2;
	compat_ulong_t s0;
	compat_ulong_t s1;
	compat_ulong_t a0;
	compat_ulong_t a1;
	compat_ulong_t a2;
	compat_ulong_t a3;
	compat_ulong_t a4;
	compat_ulong_t a5;
	compat_ulong_t a6;
	compat_ulong_t a7;
	compat_ulong_t s2;
	compat_ulong_t s3;
	compat_ulong_t s4;
	compat_ulong_t s5;
	compat_ulong_t s6;
	compat_ulong_t s7;
	compat_ulong_t s8;
	compat_ulong_t s9;
	compat_ulong_t s10;
	compat_ulong_t s11;
	compat_ulong_t t3;
	compat_ulong_t t4;
	compat_ulong_t t5;
	compat_ulong_t t6;
};

static inline void regs_to_cregs(struct compat_user_regs_struct *cregs,
				 struct pt_regs *regs)
{
	cregs->pc	= (compat_ulong_t) regs->epc;
	cregs->ra	= (compat_ulong_t) regs->ra;
	cregs->sp	= (compat_ulong_t) regs->sp;
	cregs->gp	= (compat_ulong_t) regs->gp;
	cregs->tp	= (compat_ulong_t) regs->tp;
	cregs->t0	= (compat_ulong_t) regs->t0;
	cregs->t1	= (compat_ulong_t) regs->t1;
	cregs->t2	= (compat_ulong_t) regs->t2;
	cregs->s0	= (compat_ulong_t) regs->s0;
	cregs->s1	= (compat_ulong_t) regs->s1;
	cregs->a0	= (compat_ulong_t) regs->a0;
	cregs->a1	= (compat_ulong_t) regs->a1;
	cregs->a2	= (compat_ulong_t) regs->a2;
	cregs->a3	= (compat_ulong_t) regs->a3;
	cregs->a4	= (compat_ulong_t) regs->a4;
	cregs->a5	= (compat_ulong_t) regs->a5;
	cregs->a6	= (compat_ulong_t) regs->a6;
	cregs->a7	= (compat_ulong_t) regs->a7;
	cregs->s2	= (compat_ulong_t) regs->s2;
	cregs->s3	= (compat_ulong_t) regs->s3;
	cregs->s4	= (compat_ulong_t) regs->s4;
	cregs->s5	= (compat_ulong_t) regs->s5;
	cregs->s6	= (compat_ulong_t) regs->s6;
	cregs->s7	= (compat_ulong_t) regs->s7;
	cregs->s8	= (compat_ulong_t) regs->s8;
	cregs->s9	= (compat_ulong_t) regs->s9;
	cregs->s10	= (compat_ulong_t) regs->s10;
	cregs->s11	= (compat_ulong_t) regs->s11;
	cregs->t3	= (compat_ulong_t) regs->t3;
	cregs->t4	= (compat_ulong_t) regs->t4;
	cregs->t5	= (compat_ulong_t) regs->t5;
	cregs->t6	= (compat_ulong_t) regs->t6;
};

static inline void cregs_to_regs(struct compat_user_regs_struct *cregs,
				 struct pt_regs *regs)
{
	regs->epc	= (unsigned long) cregs->pc;
	regs->ra	= (unsigned long) cregs->ra;
	regs->sp	= (unsigned long) cregs->sp;
	regs->gp	= (unsigned long) cregs->gp;
	regs->tp	= (unsigned long) cregs->tp;
	regs->t0	= (unsigned long) cregs->t0;
	regs->t1	= (unsigned long) cregs->t1;
	regs->t2	= (unsigned long) cregs->t2;
	regs->s0	= (unsigned long) cregs->s0;
	regs->s1	= (unsigned long) cregs->s1;
	regs->a0	= (unsigned long) cregs->a0;
	regs->a1	= (unsigned long) cregs->a1;
	regs->a2	= (unsigned long) cregs->a2;
	regs->a3	= (unsigned long) cregs->a3;
	regs->a4	= (unsigned long) cregs->a4;

Annotation

• Immediate include surface: `linux/types.h`, `linux/sched.h`, `asm-generic/compat.h`.
• Detected declarations: `struct compat_user_regs_struct`, `function is_compat_task`, `function is_compat_thread`, `function set_compat_task`, `function regs_to_cregs`, `function cregs_to_regs`.
• Atlas domain: Architecture Layer / arch/riscv.
• 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.