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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_set_nr(struct task_struct *task,
29 struct pt_regs *regs,
30 int nr)
31{
32 /*
33 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
34 * the target task is stopped for tracing on entering syscall, so
35 * there is no need to have the same check syscall_get_nr() has.
36 */
37 regs->u_regs[UREG_G1] = nr;
38}
39
40static inline void syscall_rollback(struct task_struct *task,
41 struct pt_regs *regs)
42{
43 /* XXX This needs some thought. On Sparc we don't
44 * XXX save away the original %o0 value somewhere.
45 * XXX Instead we hold it in register %l5 at the top
46 * XXX level trap frame and pass this down to the signal
47 * XXX dispatch code which is the only place that value
48 * XXX ever was needed.
49 */
50}
51
52#ifdef CONFIG_SPARC32
53static inline bool syscall_has_error(struct pt_regs *regs)
54{
55 return (regs->psr & PSR_C) ? true : false;
56}
57static inline void syscall_set_error(struct pt_regs *regs)
58{
59 regs->psr |= PSR_C;
60}
61static inline void syscall_clear_error(struct pt_regs *regs)
62{
63 regs->psr &= ~PSR_C;
64}
65#else
66static inline bool syscall_has_error(struct pt_regs *regs)
67{
68 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
69}
70static inline void syscall_set_error(struct pt_regs *regs)
71{
72 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
73}
74static inline void syscall_clear_error(struct pt_regs *regs)
75{
76 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
77}
78#endif
79
80static inline long syscall_get_error(struct task_struct *task,
81 struct pt_regs *regs)
82{
83 long val = regs->u_regs[UREG_I0];
84
85 return (syscall_has_error(regs) ? -val : 0);
86}
87
88static inline long syscall_get_return_value(struct task_struct *task,
89 struct pt_regs *regs)
90{
91 long val = regs->u_regs[UREG_I0];
92
93 return val;
94}
95
96static inline void syscall_set_return_value(struct task_struct *task,
97 struct pt_regs *regs,
98 int error, long val)
99{
100 if (error) {
101 syscall_set_error(regs);
102 regs->u_regs[UREG_I0] = -error;
103 } else {
104 syscall_clear_error(regs);
105 regs->u_regs[UREG_I0] = val;
106 }
107}
108
109static inline void syscall_get_arguments(struct task_struct *task,
110 struct pt_regs *regs,
111 unsigned long *args)
112{
113 int zero_extend = 0;
114 unsigned int j;
115 unsigned int n = 6;
116
117#ifdef CONFIG_SPARC64
118 if (test_tsk_thread_flag(task, TIF_32BIT))
119 zero_extend = 1;
120#endif
121
122 for (j = 0; j < n; j++) {
123 unsigned long val = regs->u_regs[UREG_I0 + j];
124
125 if (zero_extend)
126 args[j] = (u32) val;
127 else
128 args[j] = val;
129 }
130}
131
132static inline void syscall_set_arguments(struct task_struct *task,
133 struct pt_regs *regs,
134 const unsigned long *args)
135{
136 unsigned int i;
137
138 for (i = 0; i < 6; i++)
139 regs->u_regs[UREG_I0 + i] = args[i];
140}
141
142static inline int syscall_get_arch(struct task_struct *task)
143{
144#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
145 return test_tsk_thread_flag(task, TIF_32BIT)
146 ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
147#elif defined(CONFIG_SPARC64)
148 return AUDIT_ARCH_SPARC64;
149#else
150 return AUDIT_ARCH_SPARC;
151#endif
152}
153
154#endif /* __ASM_SPARC_SYSCALL_H */