Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/um/include/asm/syscall-generic.h
26481 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
/*

3
 * Access to user system call parameters and results

4
 *

5
 * See asm-generic/syscall.h for function descriptions.

6
 *

7
 * Copyright (C) 2015 Mickaël Salaün <[email protected]>

8
 */

9


10
#ifndef __UM_SYSCALL_GENERIC_H

11
#define __UM_SYSCALL_GENERIC_H

12


13
#include <asm/ptrace.h>

14
#include <linux/err.h>

15
#include <linux/sched.h>

16
#include <sysdep/ptrace.h>

17


18
static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)

19
{

20


21
	return PT_REGS_SYSCALL_NR(regs);

22
}

23


24
static inline void syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)

25
{

26
	PT_REGS_SYSCALL_NR(regs) = nr;

27
}

28


29
static inline void syscall_rollback(struct task_struct *task,

30
				    struct pt_regs *regs)

31
{

32
	/* do nothing */

33
}

34


35
static inline long syscall_get_error(struct task_struct *task,

36
				     struct pt_regs *regs)

37
{

38
	const long error = regs_return_value(regs);

39


40
	return IS_ERR_VALUE(error) ? error : 0;

41
}

42


43
static inline long syscall_get_return_value(struct task_struct *task,

44
					    struct pt_regs *regs)

45
{

46
	return regs_return_value(regs);

47
}

48


49
static inline void syscall_set_return_value(struct task_struct *task,

50
					    struct pt_regs *regs,

51
					    int error, long val)

52
{

53
	PT_REGS_SET_SYSCALL_RETURN(regs, (long) error ?: val);

54
}

55


56
static inline void syscall_get_arguments(struct task_struct *task,

57
					 struct pt_regs *regs,

58
					 unsigned long *args)

59
{

60
	const struct uml_pt_regs *r = &regs->regs;

61


62
	*args++ = UPT_SYSCALL_ARG1(r);

63
	*args++ = UPT_SYSCALL_ARG2(r);

64
	*args++ = UPT_SYSCALL_ARG3(r);

65
	*args++ = UPT_SYSCALL_ARG4(r);

66
	*args++ = UPT_SYSCALL_ARG5(r);

67
	*args   = UPT_SYSCALL_ARG6(r);

68
}

69


70
static inline void syscall_set_arguments(struct task_struct *task,

71
					 struct pt_regs *regs,

72
					 const unsigned long *args)

73
{

74
	struct uml_pt_regs *r = &regs->regs;

75


76
	UPT_SYSCALL_ARG1(r) = *args++;

77
	UPT_SYSCALL_ARG2(r) = *args++;

78
	UPT_SYSCALL_ARG3(r) = *args++;

79
	UPT_SYSCALL_ARG4(r) = *args++;

80
	UPT_SYSCALL_ARG5(r) = *args++;

81
	UPT_SYSCALL_ARG6(r) = *args;

82
}

83


84
/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */

85


86
#endif	/* __UM_SYSCALL_GENERIC_H */

87


88