projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| fb4f87a2 PM |
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> |
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7 | #include <asm/ptrace.h> |
| 8 | ||
| f15b2dc0 | 9 | /* The system call number is given by the user in R3 */ |
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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 | ||
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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; |
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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: |
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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 */ |