arch/nios2/include/asm/syscall.h

File Facts

System

Linux kernel

Corpus path

arch/nios2/include/asm/syscall.h

Extension

.h

Size

1720 bytes

Lines

83

Domain

Architecture Layer

Bucket

arch/nios2

Inferred role

Architecture Layer: syscall or user/kernel boundary

Status

core 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 participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• uapi/linux/audit.h
• linux/err.h
• linux/sched.h

Detected Declarations

• function Corporation
• function syscall_set_nr
• function syscall_rollback
• function syscall_get_error
• function syscall_get_return_value
• function syscall_set_return_value
• function syscall_get_arguments
• function syscall_set_arguments
• function syscall_get_arch

Annotated Snippet

#ifndef __ASM_NIOS2_SYSCALL_H__
#define __ASM_NIOS2_SYSCALL_H__

#include <uapi/linux/audit.h>
#include <linux/err.h>
#include <linux/sched.h>

static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
	return regs->r2;
}

static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
{
	regs->r2 = nr;
}

static inline void syscall_rollback(struct task_struct *task,
				struct pt_regs *regs)
{
	regs->r2 = regs->orig_r2;
	regs->r7 = regs->orig_r7;
}

static inline long syscall_get_error(struct task_struct *task,
				struct pt_regs *regs)
{
	return regs->r7 ? regs->r2 : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
	struct pt_regs *regs)
{
	return regs->r2;
}

static inline void syscall_set_return_value(struct task_struct *task,
	struct pt_regs *regs, int error, long val)
{
	if (error) {
		/* error < 0, but nios2 uses > 0 return value */
		regs->r2 = -error;
		regs->r7 = 1;
	} else {
		regs->r2 = val;
		regs->r7 = 0;
	}
}

static inline void syscall_get_arguments(struct task_struct *task,
	struct pt_regs *regs, unsigned long *args)
{
	*args++ = regs->r4;
	*args++ = regs->r5;
	*args++ = regs->r6;
	*args++ = regs->r7;
	*args++ = regs->r8;
	*args   = regs->r9;
}

static inline void syscall_set_arguments(struct task_struct *task,
	struct pt_regs *regs, const unsigned long *args)
{
	regs->r4 = *args++;
	regs->r5 = *args++;
	regs->r6 = *args++;
	regs->r7 = *args++;
	regs->r8 = *args++;
	regs->r9 = *args;
}

static inline int syscall_get_arch(struct task_struct *task)
{
	return AUDIT_ARCH_NIOS2;
}

#endif

Annotation

• Immediate include surface: `uapi/linux/audit.h`, `linux/err.h`, `linux/sched.h`.
• Detected declarations: `function Corporation`, `function syscall_set_nr`, `function syscall_rollback`, `function syscall_get_error`, `function syscall_get_return_value`, `function syscall_set_return_value`, `function syscall_get_arguments`, `function syscall_set_arguments`, `function syscall_get_arch`.
• Atlas domain: Architecture Layer / arch/nios2.
• Implementation status: core 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.