Linux kernel mirror (for testing)
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1#ifndef __ASM_SPARC_SYSCALL_H
2#define __ASM_SPARC_SYSCALL_H
3
4#include <uapi/linux/audit.h>
5#include <linux/kernel.h>
6#include <linux/compat.h>
7#include <linux/sched.h>
8#include <asm/ptrace.h>
9#include <asm/thread_info.h>
10
11/*
12 * The syscall table always contains 32 bit pointers since we know that the
13 * address of the function to be called is (way) below 4GB. So the "int"
14 * type here is what we want [need] for both 32 bit and 64 bit systems.
15 */
16extern const unsigned int sys_call_table[];
17
18/* The system call number is given by the user in %g1 */
19static inline long syscall_get_nr(struct task_struct *task,
20 struct pt_regs *regs)
21{
22 int syscall_p = pt_regs_is_syscall(regs);
23
24 return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
25}
26
27static inline void syscall_rollback(struct task_struct *task,
28 struct pt_regs *regs)
29{
30 /* XXX This needs some thought. On Sparc we don't
31 * XXX save away the original %o0 value somewhere.
32 * XXX Instead we hold it in register %l5 at the top
33 * XXX level trap frame and pass this down to the signal
34 * XXX dispatch code which is the only place that value
35 * XXX ever was needed.
36 */
37}
38
39#ifdef CONFIG_SPARC32
40static inline bool syscall_has_error(struct pt_regs *regs)
41{
42 return (regs->psr & PSR_C) ? true : false;
43}
44static inline void syscall_set_error(struct pt_regs *regs)
45{
46 regs->psr |= PSR_C;
47}
48static inline void syscall_clear_error(struct pt_regs *regs)
49{
50 regs->psr &= ~PSR_C;
51}
52#else
53static inline bool syscall_has_error(struct pt_regs *regs)
54{
55 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
56}
57static inline void syscall_set_error(struct pt_regs *regs)
58{
59 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
60}
61static inline void syscall_clear_error(struct pt_regs *regs)
62{
63 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
64}
65#endif
66
67static inline long syscall_get_error(struct task_struct *task,
68 struct pt_regs *regs)
69{
70 long val = regs->u_regs[UREG_I0];
71
72 return (syscall_has_error(regs) ? -val : 0);
73}
74
75static inline long syscall_get_return_value(struct task_struct *task,
76 struct pt_regs *regs)
77{
78 long val = regs->u_regs[UREG_I0];
79
80 return val;
81}
82
83static inline void syscall_set_return_value(struct task_struct *task,
84 struct pt_regs *regs,
85 int error, long val)
86{
87 if (error) {
88 syscall_set_error(regs);
89 regs->u_regs[UREG_I0] = -error;
90 } else {
91 syscall_clear_error(regs);
92 regs->u_regs[UREG_I0] = val;
93 }
94}
95
96static inline void syscall_get_arguments(struct task_struct *task,
97 struct pt_regs *regs,
98 unsigned int i, unsigned int n,
99 unsigned long *args)
100{
101 int zero_extend = 0;
102 unsigned int j;
103
104#ifdef CONFIG_SPARC64
105 if (test_tsk_thread_flag(task, TIF_32BIT))
106 zero_extend = 1;
107#endif
108
109 for (j = 0; j < n; j++) {
110 unsigned long val = regs->u_regs[UREG_I0 + i + j];
111
112 if (zero_extend)
113 args[j] = (u32) val;
114 else
115 args[j] = val;
116 }
117}
118
119static inline void syscall_set_arguments(struct task_struct *task,
120 struct pt_regs *regs,
121 unsigned int i, unsigned int n,
122 const unsigned long *args)
123{
124 unsigned int j;
125
126 for (j = 0; j < n; j++)
127 regs->u_regs[UREG_I0 + i + j] = args[j];
128}
129
130static inline int syscall_get_arch(void)
131{
132#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
133 return in_compat_syscall() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
134#elif defined(CONFIG_SPARC64)
135 return AUDIT_ARCH_SPARC64;
136#else
137 return AUDIT_ARCH_SPARC;
138#endif
139}
140
141#endif /* __ASM_SPARC_SYSCALL_H */