arch/xtensa/include/asm/syscall.h

Source file repositories/reference/linux-study-clean/arch/xtensa/include/asm/syscall.h

File Facts

System
Linux kernel
Corpus path
arch/xtensa/include/asm/syscall.h
Extension
.h
Size
2241 bytes
Lines
94
Domain
Architecture Layer
Bucket
arch/xtensa
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H

#include <linux/err.h>
#include <asm/ptrace.h>
#include <uapi/linux/audit.h>

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

typedef void (*syscall_t)(void);
extern syscall_t sys_call_table[];

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

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

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	/* Do nothing. */
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	/* 0 if syscall succeeded, otherwise -Errorcode */
	return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->areg[2];
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->areg[2] = (long) error ? error : val;
}

#define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned long *args)
{
	static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
	unsigned int i;

	for (i = 0; i < 6; ++i)
		args[i] = regs->areg[reg[i]];
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 const unsigned long *args)
{
	static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
	unsigned int i;

	for (i = 0; i < 6; ++i)
		regs->areg[reg[i]] = args[i];
}

asmlinkage long xtensa_rt_sigreturn(void);
asmlinkage long xtensa_shmat(int, char __user *, int);
asmlinkage long xtensa_fadvise64_64(int, int,
				    unsigned long long, unsigned long long);

#endif

Annotation

Implementation Notes