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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Access to user system call parameters and results
*
* See asm-generic/syscall.h for function descriptions.
*
* Copyright (C) 2015 Mickaël Salaün <[email protected]>
*/
#ifndef __UM_SYSCALL_GENERIC_H
#define __UM_SYSCALL_GENERIC_H
#include <asm/ptrace.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <sysdep/ptrace.h>
static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
return PT_REGS_SYSCALL_NR(regs);
}
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)
{
const long error = regs_return_value(regs);
return IS_ERR_VALUE(error) ? error : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs_return_value(regs);
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);
}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned long *args)
{
const struct uml_pt_regs *r = ®s->regs;
*args++ = UPT_SYSCALL_ARG1(r);
*args++ = UPT_SYSCALL_ARG2(r);
*args++ = UPT_SYSCALL_ARG3(r);
*args++ = UPT_SYSCALL_ARG4(r);
*args++ = UPT_SYSCALL_ARG5(r);
*args = UPT_SYSCALL_ARG6(r);
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
const unsigned long *args)
{
struct uml_pt_regs *r = ®s->regs;
UPT_SYSCALL_ARG1(r) = *args++;
UPT_SYSCALL_ARG2(r) = *args++;
UPT_SYSCALL_ARG3(r) = *args++;
UPT_SYSCALL_ARG4(r) = *args++;
UPT_SYSCALL_ARG5(r) = *args++;
UPT_SYSCALL_ARG6(r) = *args;
}
/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
#endif /* __UM_SYSCALL_GENERIC_H */