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/* 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)
{
if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT))
return task_thread_info(task)->abi_syscall;
if (task_thread_info(task)->abi_syscall == -1)
return -1;
return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK;
}
static inline bool __in_oabi_syscall(struct task_struct *task)
{
return IS_ENABLED(CONFIG_OABI_COMPAT) &&
(task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE);
}
static inline bool in_oabi_syscall(void)
{
return __in_oabi_syscall(current);
}
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;
}
static inline void syscall_set_nr(struct task_struct *task,
struct pt_regs *regs,
int nr)
{
if (nr == -1) {
task_thread_info(task)->abi_syscall = -1;
/*
* When the syscall number is set to -1, the syscall will be
* skipped. In this case the syscall return value has to be
* set explicitly, otherwise the first syscall argument is
* returned as the syscall return value.
*/
syscall_set_return_value(task, regs, -ENOSYS, 0);
return;
}
if ((IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT))) {
task_thread_info(task)->abi_syscall = nr;
return;
}
task_thread_info(task)->abi_syscall =
(task_thread_info(task)->abi_syscall & ~__NR_SYSCALL_MASK) |
(nr & __NR_SYSCALL_MASK);
}
#define SYSCALL_MAX_ARGS 7
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned long *args)
{
args[0] = regs->ARM_ORIG_r0;
args++;
memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0]));
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
const unsigned long *args)
{
memcpy(®s->ARM_r0, args, 6 * sizeof(args[0]));
/*
* Also copy the first argument into ARM_ORIG_r0
* so that syscall_get_arguments() would return it
* instead of the previous value.
*/
regs->ARM_ORIG_r0 = regs->ARM_r0;
}
static inline int syscall_get_arch(struct task_struct *task)
{
/* ARM tasks don't change audit architectures on the fly. */
return AUDIT_ARCH_ARM;
}
#endif /* _ASM_ARM_SYSCALL_H */
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