1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SPARC_SYSCALL_H
3#define __ASM_SPARC_SYSCALL_H
4
5#include <uapi/linux/audit.h>
6#include <linux/kernel.h>
7#include <linux/compat.h>
8#include <linux/sched.h>
9#include <asm/ptrace.h>
10#include <asm/thread_info.h>
11
12/*
13 * The syscall table always contains 32 bit pointers since we know that the
14 * address of the function to be called is (way) below 4GB.  So the "int"
15 * type here is what we want [need] for both 32 bit and 64 bit systems.
16 */
17extern const unsigned int sys_call_table[];
18
19/* The system call number is given by the user in %g1 */
20static inline long syscall_get_nr(struct task_struct *task,
21				  struct pt_regs *regs)
22{
23	int syscall_p = pt_regs_is_syscall(regs);
24
25	return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
26}
27
28static inline void syscall_rollback(struct task_struct *task,
29				    struct pt_regs *regs)
30{
31	/* XXX This needs some thought.  On Sparc we don't
32	 * XXX save away the original %o0 value somewhere.
33	 * XXX Instead we hold it in register %l5 at the top
34	 * XXX level trap frame and pass this down to the signal
35	 * XXX dispatch code which is the only place that value
36	 * XXX ever was needed.
37	 */
38}
39
40#ifdef CONFIG_SPARC32
41static inline bool syscall_has_error(struct pt_regs *regs)
42{
43	return (regs->psr & PSR_C) ? true : false;
44}
45static inline void syscall_set_error(struct pt_regs *regs)
46{
47	regs->psr |= PSR_C;
48}
49static inline void syscall_clear_error(struct pt_regs *regs)
50{
51	regs->psr &= ~PSR_C;
52}
53#else
54static inline bool syscall_has_error(struct pt_regs *regs)
55{
56	return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
57}
58static inline void syscall_set_error(struct pt_regs *regs)
59{
60	regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
61}
62static inline void syscall_clear_error(struct pt_regs *regs)
63{
64	regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
65}
66#endif
67
68static inline long syscall_get_error(struct task_struct *task,
69				     struct pt_regs *regs)
70{
71	long val = regs->u_regs[UREG_I0];
72
73	return (syscall_has_error(regs) ? -val : 0);
74}
75
76static inline long syscall_get_return_value(struct task_struct *task,
77					    struct pt_regs *regs)
78{
79	long val = regs->u_regs[UREG_I0];
80
81	return val;
82}
83
84static inline void syscall_set_return_value(struct task_struct *task,
85					    struct pt_regs *regs,
86					    int error, long val)
87{
88	if (error) {
89		syscall_set_error(regs);
90		regs->u_regs[UREG_I0] = -error;
91	} else {
92		syscall_clear_error(regs);
93		regs->u_regs[UREG_I0] = val;
94	}
95}
96
97static inline void syscall_get_arguments(struct task_struct *task,
98					 struct pt_regs *regs,
99					 unsigned long *args)
100{
101	int zero_extend = 0;
102	unsigned int j;
103	unsigned int n = 6;
104
105#ifdef CONFIG_SPARC64
106	if (test_tsk_thread_flag(task, TIF_32BIT))
107		zero_extend = 1;
108#endif
109
110	for (j = 0; j < n; j++) {
111		unsigned long val = regs->u_regs[UREG_I0 + j];
112
113		if (zero_extend)
114			args[j] = (u32) val;
115		else
116			args[j] = val;
117	}
118}
119
120static inline int syscall_get_arch(struct task_struct *task)
121{
122#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
123	return test_tsk_thread_flag(task, TIF_32BIT)
124		? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
125#elif defined(CONFIG_SPARC64)
126	return AUDIT_ARCH_SPARC64;
127#else
128	return AUDIT_ARCH_SPARC;
129#endif
130}
131
132#endif /* __ASM_SPARC_SYSCALL_H */
133