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gerrit-public.fairphone.software / kernel / msm / 953c2d70b6dcac05c759aa39aaecab5a4d71d270 / . / arch / sparc / include / asm / syscall.h
blob: 025a02ad2e31c9a87c15350241234b8943e04ae6 [file] [log] [blame]
David S. Millerbadcbf02008-07-27 00:53:10 -0700[diff] [blame]1#ifndef __ASM_SPARC_SYSCALL_H
2#define __ASM_SPARC_SYSCALL_H
3
4#include <linux/kernel.h>
5#include <linux/sched.h>
6#include <asm/ptrace.h>
7
Mike Frysingere7b8e672010-01-26 04:40:03 -0500[diff] [blame]8/*
9 * The syscall table always contains 32 bit pointers since we know that the
10 * address of the function to be called is (way) below 4GB. So the "int"
11 * type here is what we want [need] for both 32 bit and 64 bit systems.
12 */
13extern const unsigned int sys_call_table[];
14
David S. Millerbadcbf02008-07-27 00:53:10 -0700[diff] [blame]15/* The system call number is given by the user in %g1 */
16static inline long syscall_get_nr(struct task_struct *task,
17 struct pt_regs *regs)
18{
19 int syscall_p = pt_regs_is_syscall(regs);
20
21 return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
22}
23
24static inline void syscall_rollback(struct task_struct *task,
25 struct pt_regs *regs)
26{
27 /* XXX This needs some thought. On Sparc we don't
28 * XXX save away the original %o0 value somewhere.
29 * XXX Instead we hold it in register %l5 at the top
30 * XXX level trap frame and pass this down to the signal
31 * XXX dispatch code which is the only place that value
32 * XXX ever was needed.
33 */
34}
35
36#ifdef CONFIG_SPARC32
37static inline bool syscall_has_error(struct pt_regs *regs)
38{
39 return (regs->psr & PSR_C) ? true : false;
40}
41static inline void syscall_set_error(struct pt_regs *regs)
42{
43 regs->psr |= PSR_C;
44}
45static inline void syscall_clear_error(struct pt_regs *regs)
46{
47 regs->psr &= ~PSR_C;
48}
49#else
50static inline bool syscall_has_error(struct pt_regs *regs)
51{
52 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
53}
54static inline void syscall_set_error(struct pt_regs *regs)
55{
56 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
57}
58static inline void syscall_clear_error(struct pt_regs *regs)
59{
60 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
61}
62#endif
63
64static inline long syscall_get_error(struct task_struct *task,
65 struct pt_regs *regs)
66{
67 long val = regs->u_regs[UREG_I0];
68
69 return (syscall_has_error(regs) ? -val : 0);
70}
71
72static inline long syscall_get_return_value(struct task_struct *task,
73 struct pt_regs *regs)
74{
75 long val = regs->u_regs[UREG_I0];
76
77 return val;
78}
79
80static inline void syscall_set_return_value(struct task_struct *task,
81 struct pt_regs *regs,
82 int error, long val)
83{
84 if (error) {
85 syscall_set_error(regs);
86 regs->u_regs[UREG_I0] = -error;
87 } else {
88 syscall_clear_error(regs);
89 regs->u_regs[UREG_I0] = val;
90 }
91}
92
93static inline void syscall_get_arguments(struct task_struct *task,
94 struct pt_regs *regs,
95 unsigned int i, unsigned int n,
96 unsigned long *args)
97{
98 int zero_extend = 0;
99 unsigned int j;
100
101#ifdef CONFIG_SPARC64
102 if (test_tsk_thread_flag(task, TIF_32BIT))
103 zero_extend = 1;
104#endif
105
106 for (j = 0; j < n; j++) {
107 unsigned long val = regs->u_regs[UREG_I0 + i + j];
108
109 if (zero_extend)
110 args[j] = (u32) val;
111 else
112 args[j] = val;
113 }
114}
115
116static inline void syscall_set_arguments(struct task_struct *task,
117 struct pt_regs *regs,
118 unsigned int i, unsigned int n,
119 const unsigned long *args)
120{
121 unsigned int j;
122
123 for (j = 0; j < n; j++)
124 regs->u_regs[UREG_I0 + i + j] = args[j];
125}
126
127#endif /* __ASM_SPARC_SYSCALL_H */