114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Access to user system call parameters and results
|
|
*
|
|
* See asm-generic/syscall.h for descriptions of what we must do here.
|
|
*/
|
|
|
|
#ifndef _ASM_ARM_SYSCALL_H
|
|
#define _ASM_ARM_SYSCALL_H
|
|
|
|
#include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
|
|
#include <linux/elf.h> /* for ELF_EM */
|
|
#include <linux/err.h>
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/unistd.h>
|
|
|
|
#define NR_syscalls (__NR_syscalls)
|
|
|
|
extern const unsigned long sys_call_table[];
|
|
|
|
static inline int syscall_get_nr(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return task_thread_info(task)->syscall;
|
|
}
|
|
|
|
static inline void syscall_rollback(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
regs->ARM_r0 = regs->ARM_ORIG_r0;
|
|
}
|
|
|
|
static inline long syscall_get_error(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long error = regs->ARM_r0;
|
|
return IS_ERR_VALUE(error) ? error : 0;
|
|
}
|
|
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->ARM_r0;
|
|
}
|
|
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
int error, long val)
|
|
{
|
|
regs->ARM_r0 = (long) error ? error : val;
|
|
}
|
|
|
|
#define SYSCALL_MAX_ARGS 7
|
|
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned int i, unsigned int n,
|
|
unsigned long *args)
|
|
{
|
|
if (n == 0)
|
|
return;
|
|
|
|
if (i + n > SYSCALL_MAX_ARGS) {
|
|
unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
|
|
unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
|
|
pr_warn("%s called with max args %d, handling only %d\n",
|
|
__func__, i + n, SYSCALL_MAX_ARGS);
|
|
memset(args_bad, 0, n_bad * sizeof(args[0]));
|
|
n = SYSCALL_MAX_ARGS - i;
|
|
}
|
|
|
|
if (i == 0) {
|
|
args[0] = regs->ARM_ORIG_r0;
|
|
args++;
|
|
i++;
|
|
n--;
|
|
}
|
|
|
|
memcpy(args, ®s->ARM_r0 + i, n * sizeof(args[0]));
|
|
}
|
|
|
|
static inline void syscall_set_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned int i, unsigned int n,
|
|
const unsigned long *args)
|
|
{
|
|
if (n == 0)
|
|
return;
|
|
|
|
if (i + n > SYSCALL_MAX_ARGS) {
|
|
pr_warn("%s called with max args %d, handling only %d\n",
|
|
__func__, i + n, SYSCALL_MAX_ARGS);
|
|
n = SYSCALL_MAX_ARGS - i;
|
|
}
|
|
|
|
if (i == 0) {
|
|
regs->ARM_ORIG_r0 = args[0];
|
|
args++;
|
|
i++;
|
|
n--;
|
|
}
|
|
|
|
memcpy(®s->ARM_r0 + i, args, n * sizeof(args[0]));
|
|
}
|
|
|
|
static inline int syscall_get_arch(void)
|
|
{
|
|
/* ARM tasks don't change audit architectures on the fly. */
|
|
return AUDIT_ARCH_ARM;
|
|
}
|
|
|
|
#endif /* _ASM_ARM_SYSCALL_H */
|