Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2012 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #ifndef __ASM_SYSCALL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #define __ASM_SYSCALL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <uapi/linux/audit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) typedef long (*syscall_fn_t)(const struct pt_regs *regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) extern const syscall_fn_t sys_call_table[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) extern const syscall_fn_t compat_sys_call_table[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static inline int syscall_get_nr(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 				 struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	return regs->syscallno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static inline void syscall_rollback(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 				    struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	regs->regs[0] = regs->orig_x0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static inline long syscall_get_return_value(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 					    struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	unsigned long val = regs->regs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (is_compat_thread(task_thread_info(task)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		val = sign_extend64(val, 31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static inline long syscall_get_error(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 				     struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	unsigned long error = syscall_get_return_value(task, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	return IS_ERR_VALUE(error) ? error : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static inline void syscall_set_return_value(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 					    struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 					    int error, long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		val = error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (is_compat_thread(task_thread_info(task)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		val = lower_32_bits(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	regs->regs[0] = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define SYSCALL_MAX_ARGS 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static inline void syscall_get_arguments(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 					 struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 					 unsigned long *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	args[0] = regs->orig_x0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static inline void syscall_set_arguments(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 					 struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 					 const unsigned long *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	regs->orig_x0 = args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	memcpy(&regs->regs[1], args, 5 * sizeof(args[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)  * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)  * AArch64 has the same system calls both on little- and big- endian.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static inline int syscall_get_arch(struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 	if (is_compat_thread(task_thread_info(task)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 		return AUDIT_ARCH_ARM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 	return AUDIT_ARCH_AARCH64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #endif	/* __ASM_SYSCALL_H */