10b73214fSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2753c4dd6SMartin Schwidefsky /*
3753c4dd6SMartin Schwidefsky * Access to user system call parameters and results
4753c4dd6SMartin Schwidefsky *
5753c4dd6SMartin Schwidefsky * Copyright IBM Corp. 2008
6753c4dd6SMartin Schwidefsky * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7753c4dd6SMartin Schwidefsky */
8753c4dd6SMartin Schwidefsky
9753c4dd6SMartin Schwidefsky #ifndef _ASM_SYSCALL_H
10753c4dd6SMartin Schwidefsky #define _ASM_SYSCALL_H 1
11753c4dd6SMartin Schwidefsky
12579ec9e1SEric Paris #include <uapi/linux/audit.h>
139bf1226bSHeiko Carstens #include <linux/sched.h>
1420b40a79SMartin Schwidefsky #include <linux/err.h>
15753c4dd6SMartin Schwidefsky #include <asm/ptrace.h>
16753c4dd6SMartin Schwidefsky
1756e62a73SSven Schnelle extern const sys_call_ptr_t sys_call_table[];
1856e62a73SSven Schnelle extern const sys_call_ptr_t sys_call_table_emu[];
19e7b8e675SMike Frysinger
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)20753c4dd6SMartin Schwidefsky static inline long syscall_get_nr(struct task_struct *task,
21753c4dd6SMartin Schwidefsky struct pt_regs *regs)
22753c4dd6SMartin Schwidefsky {
23d3a73acbSMartin Schwidefsky return test_pt_regs_flag(regs, PIF_SYSCALL) ?
24aa33c8cbSMartin Schwidefsky (regs->int_code & 0xffff) : -1;
25753c4dd6SMartin Schwidefsky }
26753c4dd6SMartin Schwidefsky
syscall_rollback(struct task_struct * task,struct pt_regs * regs)27753c4dd6SMartin Schwidefsky static inline void syscall_rollback(struct task_struct *task,
28753c4dd6SMartin Schwidefsky struct pt_regs *regs)
29753c4dd6SMartin Schwidefsky {
30753c4dd6SMartin Schwidefsky regs->gprs[2] = regs->orig_gpr2;
31753c4dd6SMartin Schwidefsky }
32753c4dd6SMartin Schwidefsky
syscall_get_error(struct task_struct * task,struct pt_regs * regs)33753c4dd6SMartin Schwidefsky static inline long syscall_get_error(struct task_struct *task,
34753c4dd6SMartin Schwidefsky struct pt_regs *regs)
35753c4dd6SMartin Schwidefsky {
36b3583fcaSDmitry V. Levin unsigned long error = regs->gprs[2];
37b3583fcaSDmitry V. Levin #ifdef CONFIG_COMPAT
38b3583fcaSDmitry V. Levin if (test_tsk_thread_flag(task, TIF_31BIT)) {
39b3583fcaSDmitry V. Levin /*
40b3583fcaSDmitry V. Levin * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
41b3583fcaSDmitry V. Levin * and will match correctly in comparisons.
42b3583fcaSDmitry V. Levin */
43b3583fcaSDmitry V. Levin error = (long)(int)error;
44b3583fcaSDmitry V. Levin }
45b3583fcaSDmitry V. Levin #endif
46b3583fcaSDmitry V. Levin return IS_ERR_VALUE(error) ? error : 0;
47753c4dd6SMartin Schwidefsky }
48753c4dd6SMartin Schwidefsky
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)49753c4dd6SMartin Schwidefsky static inline long syscall_get_return_value(struct task_struct *task,
50753c4dd6SMartin Schwidefsky struct pt_regs *regs)
51753c4dd6SMartin Schwidefsky {
52753c4dd6SMartin Schwidefsky return regs->gprs[2];
53753c4dd6SMartin Schwidefsky }
54753c4dd6SMartin Schwidefsky
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)55753c4dd6SMartin Schwidefsky static inline void syscall_set_return_value(struct task_struct *task,
56753c4dd6SMartin Schwidefsky struct pt_regs *regs,
57753c4dd6SMartin Schwidefsky int error, long val)
58753c4dd6SMartin Schwidefsky {
5956e62a73SSven Schnelle set_pt_regs_flag(regs, PIF_SYSCALL_RET_SET);
60dc295880SJan Willeke regs->gprs[2] = error ? error : val;
61753c4dd6SMartin Schwidefsky }
62753c4dd6SMartin Schwidefsky
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)63753c4dd6SMartin Schwidefsky static inline void syscall_get_arguments(struct task_struct *task,
64753c4dd6SMartin Schwidefsky struct pt_regs *regs,
65753c4dd6SMartin Schwidefsky unsigned long *args)
66753c4dd6SMartin Schwidefsky {
6759da2139SMartin Schwidefsky unsigned long mask = -1UL;
68b35f549dSSteven Rostedt (Red Hat) unsigned int n = 6;
6959da2139SMartin Schwidefsky
70753c4dd6SMartin Schwidefsky #ifdef CONFIG_COMPAT
7159da2139SMartin Schwidefsky if (test_tsk_thread_flag(task, TIF_31BIT))
7259da2139SMartin Schwidefsky mask = 0xffffffff;
73753c4dd6SMartin Schwidefsky #endif
7459da2139SMartin Schwidefsky while (n-- > 0)
75b35f549dSSteven Rostedt (Red Hat) if (n > 0)
76b35f549dSSteven Rostedt (Red Hat) args[n] = regs->gprs[2 + n] & mask;
77b35f549dSSteven Rostedt (Red Hat)
7859da2139SMartin Schwidefsky args[0] = regs->orig_gpr2 & mask;
79753c4dd6SMartin Schwidefsky }
80753c4dd6SMartin Schwidefsky
syscall_get_arch(struct task_struct * task)8116add411SDmitry V. Levin static inline int syscall_get_arch(struct task_struct *task)
82c63cb468SHeiko Carstens {
83c63cb468SHeiko Carstens #ifdef CONFIG_COMPAT
8416add411SDmitry V. Levin if (test_tsk_thread_flag(task, TIF_31BIT))
85c63cb468SHeiko Carstens return AUDIT_ARCH_S390;
86c63cb468SHeiko Carstens #endif
871a327ffdSHeiko Carstens return AUDIT_ARCH_S390X;
88c63cb468SHeiko Carstens }
8956e62a73SSven Schnelle
arch_syscall_is_vdso_sigreturn(struct pt_regs * regs)9056e62a73SSven Schnelle static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
9156e62a73SSven Schnelle {
9256e62a73SSven Schnelle return false;
9356e62a73SSven Schnelle }
9456e62a73SSven Schnelle
95*91f05c27SHeiko Carstens #define SYSCALL_FMT_0
96*91f05c27SHeiko Carstens #define SYSCALL_FMT_1 , "0" (r2)
97*91f05c27SHeiko Carstens #define SYSCALL_FMT_2 , "d" (r3) SYSCALL_FMT_1
98*91f05c27SHeiko Carstens #define SYSCALL_FMT_3 , "d" (r4) SYSCALL_FMT_2
99*91f05c27SHeiko Carstens #define SYSCALL_FMT_4 , "d" (r5) SYSCALL_FMT_3
100*91f05c27SHeiko Carstens #define SYSCALL_FMT_5 , "d" (r6) SYSCALL_FMT_4
101*91f05c27SHeiko Carstens #define SYSCALL_FMT_6 , "d" (r7) SYSCALL_FMT_5
102*91f05c27SHeiko Carstens
103*91f05c27SHeiko Carstens #define SYSCALL_PARM_0
104*91f05c27SHeiko Carstens #define SYSCALL_PARM_1 , long arg1
105*91f05c27SHeiko Carstens #define SYSCALL_PARM_2 SYSCALL_PARM_1, long arg2
106*91f05c27SHeiko Carstens #define SYSCALL_PARM_3 SYSCALL_PARM_2, long arg3
107*91f05c27SHeiko Carstens #define SYSCALL_PARM_4 SYSCALL_PARM_3, long arg4
108*91f05c27SHeiko Carstens #define SYSCALL_PARM_5 SYSCALL_PARM_4, long arg5
109*91f05c27SHeiko Carstens #define SYSCALL_PARM_6 SYSCALL_PARM_5, long arg6
110*91f05c27SHeiko Carstens
111*91f05c27SHeiko Carstens #define SYSCALL_REGS_0
112*91f05c27SHeiko Carstens #define SYSCALL_REGS_1 \
113*91f05c27SHeiko Carstens register long r2 asm("2") = arg1
114*91f05c27SHeiko Carstens #define SYSCALL_REGS_2 \
115*91f05c27SHeiko Carstens SYSCALL_REGS_1; \
116*91f05c27SHeiko Carstens register long r3 asm("3") = arg2
117*91f05c27SHeiko Carstens #define SYSCALL_REGS_3 \
118*91f05c27SHeiko Carstens SYSCALL_REGS_2; \
119*91f05c27SHeiko Carstens register long r4 asm("4") = arg3
120*91f05c27SHeiko Carstens #define SYSCALL_REGS_4 \
121*91f05c27SHeiko Carstens SYSCALL_REGS_3; \
122*91f05c27SHeiko Carstens register long r5 asm("5") = arg4
123*91f05c27SHeiko Carstens #define SYSCALL_REGS_5 \
124*91f05c27SHeiko Carstens SYSCALL_REGS_4; \
125*91f05c27SHeiko Carstens register long r6 asm("6") = arg5
126*91f05c27SHeiko Carstens #define SYSCALL_REGS_6 \
127*91f05c27SHeiko Carstens SYSCALL_REGS_5; \
128*91f05c27SHeiko Carstens register long r7 asm("7") = arg6
129*91f05c27SHeiko Carstens
130*91f05c27SHeiko Carstens #define GENERATE_SYSCALL_FUNC(nr) \
131*91f05c27SHeiko Carstens static __always_inline \
132*91f05c27SHeiko Carstens long syscall##nr(unsigned long syscall SYSCALL_PARM_##nr) \
133*91f05c27SHeiko Carstens { \
134*91f05c27SHeiko Carstens register unsigned long r1 asm ("1") = syscall; \
135*91f05c27SHeiko Carstens register long rc asm ("2"); \
136*91f05c27SHeiko Carstens SYSCALL_REGS_##nr; \
137*91f05c27SHeiko Carstens \
138*91f05c27SHeiko Carstens asm volatile ( \
139*91f05c27SHeiko Carstens " svc 0\n" \
140*91f05c27SHeiko Carstens : "=d" (rc) \
141*91f05c27SHeiko Carstens : "d" (r1) SYSCALL_FMT_##nr \
142*91f05c27SHeiko Carstens : "memory"); \
143*91f05c27SHeiko Carstens return rc; \
144*91f05c27SHeiko Carstens }
145*91f05c27SHeiko Carstens
146*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(0)
147*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(1)
148*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(2)
149*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(3)
150*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(4)
151*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(5)
152*91f05c27SHeiko Carstens GENERATE_SYSCALL_FUNC(6)
153*91f05c27SHeiko Carstens
154753c4dd6SMartin Schwidefsky #endif /* _ASM_SYSCALL_H */
155