1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Access to user system call parameters and results
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright IBM Corp. 2008
6*4882a593Smuzhiyun * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef _ASM_SYSCALL_H
10*4882a593Smuzhiyun #define _ASM_SYSCALL_H 1
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <uapi/linux/audit.h>
13*4882a593Smuzhiyun #include <linux/sched.h>
14*4882a593Smuzhiyun #include <linux/err.h>
15*4882a593Smuzhiyun #include <asm/ptrace.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun extern const unsigned long sys_call_table[];
18*4882a593Smuzhiyun extern const unsigned long sys_call_table_emu[];
19*4882a593Smuzhiyun
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)20*4882a593Smuzhiyun static inline long syscall_get_nr(struct task_struct *task,
21*4882a593Smuzhiyun struct pt_regs *regs)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun return test_pt_regs_flag(regs, PIF_SYSCALL) ?
24*4882a593Smuzhiyun (regs->int_code & 0xffff) : -1;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
syscall_rollback(struct task_struct * task,struct pt_regs * regs)27*4882a593Smuzhiyun static inline void syscall_rollback(struct task_struct *task,
28*4882a593Smuzhiyun struct pt_regs *regs)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun regs->gprs[2] = regs->orig_gpr2;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
syscall_get_error(struct task_struct * task,struct pt_regs * regs)33*4882a593Smuzhiyun static inline long syscall_get_error(struct task_struct *task,
34*4882a593Smuzhiyun struct pt_regs *regs)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun unsigned long error = regs->gprs[2];
37*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
38*4882a593Smuzhiyun if (test_tsk_thread_flag(task, TIF_31BIT)) {
39*4882a593Smuzhiyun /*
40*4882a593Smuzhiyun * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
41*4882a593Smuzhiyun * and will match correctly in comparisons.
42*4882a593Smuzhiyun */
43*4882a593Smuzhiyun error = (long)(int)error;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun #endif
46*4882a593Smuzhiyun return IS_ERR_VALUE(error) ? error : 0;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)49*4882a593Smuzhiyun static inline long syscall_get_return_value(struct task_struct *task,
50*4882a593Smuzhiyun struct pt_regs *regs)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun return regs->gprs[2];
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)55*4882a593Smuzhiyun static inline void syscall_set_return_value(struct task_struct *task,
56*4882a593Smuzhiyun struct pt_regs *regs,
57*4882a593Smuzhiyun int error, long val)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun regs->gprs[2] = error ? error : val;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)62*4882a593Smuzhiyun static inline void syscall_get_arguments(struct task_struct *task,
63*4882a593Smuzhiyun struct pt_regs *regs,
64*4882a593Smuzhiyun unsigned long *args)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun unsigned long mask = -1UL;
67*4882a593Smuzhiyun unsigned int n = 6;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
70*4882a593Smuzhiyun if (test_tsk_thread_flag(task, TIF_31BIT))
71*4882a593Smuzhiyun mask = 0xffffffff;
72*4882a593Smuzhiyun #endif
73*4882a593Smuzhiyun while (n-- > 0)
74*4882a593Smuzhiyun if (n > 0)
75*4882a593Smuzhiyun args[n] = regs->gprs[2 + n] & mask;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun args[0] = regs->orig_gpr2 & mask;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)80*4882a593Smuzhiyun static inline void syscall_set_arguments(struct task_struct *task,
81*4882a593Smuzhiyun struct pt_regs *regs,
82*4882a593Smuzhiyun const unsigned long *args)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun unsigned int n = 6;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun while (n-- > 0)
87*4882a593Smuzhiyun if (n > 0)
88*4882a593Smuzhiyun regs->gprs[2 + n] = args[n];
89*4882a593Smuzhiyun regs->orig_gpr2 = args[0];
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
syscall_get_arch(struct task_struct * task)92*4882a593Smuzhiyun static inline int syscall_get_arch(struct task_struct *task)
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun #ifdef CONFIG_COMPAT
95*4882a593Smuzhiyun if (test_tsk_thread_flag(task, TIF_31BIT))
96*4882a593Smuzhiyun return AUDIT_ARCH_S390;
97*4882a593Smuzhiyun #endif
98*4882a593Smuzhiyun return AUDIT_ARCH_S390X;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun #endif /* _ASM_SYSCALL_H */
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