1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Access to user system call parameters and results
5 * Copyright IBM Corp. 2008
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #define _ASM_SYSCALL_H 1
12 #include <uapi/linux/audit.h>
13 #include <linux/sched.h>
14 #include <linux/err.h>
15 #include <asm/ptrace.h>
18 * The syscall table always contains 32 bit pointers since we know that the
19 * address of the function to be called is (way) below 4GB. So the "int"
20 * type here is what we want [need] for both 32 bit and 64 bit systems.
22 extern const unsigned int sys_call_table[];
23 extern const unsigned int sys_call_table_emu[];
25 static inline long syscall_get_nr(struct task_struct *task,
28 return test_pt_regs_flag(regs, PIF_SYSCALL) ?
29 (regs->int_code & 0xffff) : -1;
32 static inline void syscall_rollback(struct task_struct *task,
35 regs->gprs[2] = regs->orig_gpr2;
38 static inline long syscall_get_error(struct task_struct *task,
41 unsigned long error = regs->gprs[2];
43 if (test_tsk_thread_flag(task, TIF_31BIT)) {
45 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
46 * and will match correctly in comparisons.
48 error = (long)(int)error;
51 return IS_ERR_VALUE(error) ? error : 0;
54 static inline long syscall_get_return_value(struct task_struct *task,
60 static inline void syscall_set_return_value(struct task_struct *task,
64 regs->gprs[2] = error ? error : val;
67 static inline void syscall_get_arguments(struct task_struct *task,
69 unsigned int i, unsigned int n,
72 unsigned long mask = -1UL;
75 * No arguments for this syscall, there's nothing to do.
82 if (test_tsk_thread_flag(task, TIF_31BIT))
87 args[n] = regs->gprs[2 + i + n] & mask;
89 args[0] = regs->orig_gpr2 & mask;
92 static inline void syscall_set_arguments(struct task_struct *task,
94 unsigned int i, unsigned int n,
95 const unsigned long *args)
100 regs->gprs[2 + i + n] = args[n];
102 regs->orig_gpr2 = args[0];
105 static inline int syscall_get_arch(void)
108 if (test_tsk_thread_flag(current, TIF_31BIT))
109 return AUDIT_ARCH_S390;
111 return AUDIT_ARCH_S390X;
113 #endif /* _ASM_SYSCALL_H */