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1 | #ifndef __ASM_SH_SYSCALL_32_H |
2 | #define __ASM_SH_SYSCALL_32_H | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | #include <linux/sched.h> | |
34e19ada | 6 | #include <linux/err.h> |
fb4f87a2 PM |
7 | #include <asm/ptrace.h> |
8 | ||
f15b2dc0 | 9 | /* The system call number is given by the user in R3 */ |
fb4f87a2 PM |
10 | static inline long syscall_get_nr(struct task_struct *task, |
11 | struct pt_regs *regs) | |
12 | { | |
13 | return (regs->tra >= 0) ? regs->regs[3] : -1L; | |
14 | } | |
15 | ||
16 | static inline void syscall_rollback(struct task_struct *task, | |
17 | struct pt_regs *regs) | |
18 | { | |
19 | /* | |
20 | * XXX: This needs some thought. On SH we don't | |
21 | * save away the original r0 value anywhere. | |
22 | */ | |
23 | } | |
24 | ||
fb4f87a2 PM |
25 | static inline long syscall_get_error(struct task_struct *task, |
26 | struct pt_regs *regs) | |
27 | { | |
03f07876 | 28 | return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0; |
fb4f87a2 PM |
29 | } |
30 | ||
31 | static inline long syscall_get_return_value(struct task_struct *task, | |
32 | struct pt_regs *regs) | |
33 | { | |
34 | return regs->regs[0]; | |
35 | } | |
36 | ||
37 | static inline void syscall_set_return_value(struct task_struct *task, | |
38 | struct pt_regs *regs, | |
39 | int error, long val) | |
40 | { | |
03f07876 | 41 | if (error) |
fb4f87a2 | 42 | regs->regs[0] = -error; |
03f07876 | 43 | else |
fb4f87a2 | 44 | regs->regs[0] = val; |
fb4f87a2 PM |
45 | } |
46 | ||
47 | static inline void syscall_get_arguments(struct task_struct *task, | |
48 | struct pt_regs *regs, | |
49 | unsigned int i, unsigned int n, | |
50 | unsigned long *args) | |
51 | { | |
52 | /* | |
53 | * Do this simply for now. If we need to start supporting | |
54 | * fetching arguments from arbitrary indices, this will need some | |
55 | * extra logic. Presently there are no in-tree users that depend | |
56 | * on this behaviour. | |
57 | */ | |
58 | BUG_ON(i); | |
59 | ||
60 | /* Argument pattern is: R4, R5, R6, R7, R0, R1 */ | |
61 | switch (n) { | |
62 | case 6: args[5] = regs->regs[1]; | |
63 | case 5: args[4] = regs->regs[0]; | |
64 | case 4: args[3] = regs->regs[7]; | |
65 | case 3: args[2] = regs->regs[6]; | |
66 | case 2: args[1] = regs->regs[5]; | |
67 | case 1: args[0] = regs->regs[4]; | |
c652d780 | 68 | case 0: |
fb4f87a2 PM |
69 | break; |
70 | default: | |
71 | BUG(); | |
72 | } | |
73 | } | |
74 | ||
75 | static inline void syscall_set_arguments(struct task_struct *task, | |
76 | struct pt_regs *regs, | |
77 | unsigned int i, unsigned int n, | |
78 | const unsigned long *args) | |
79 | { | |
80 | /* Same note as above applies */ | |
81 | BUG_ON(i); | |
82 | ||
83 | switch (n) { | |
84 | case 6: regs->regs[1] = args[5]; | |
85 | case 5: regs->regs[0] = args[4]; | |
86 | case 4: regs->regs[7] = args[3]; | |
87 | case 3: regs->regs[6] = args[2]; | |
88 | case 2: regs->regs[5] = args[1]; | |
89 | case 1: regs->regs[4] = args[0]; | |
90 | break; | |
91 | default: | |
92 | BUG(); | |
93 | } | |
94 | } | |
95 | ||
96 | #endif /* __ASM_SH_SYSCALL_32_H */ |