| Paul Mundt | fb4f87a | 2008-09-12 22:13:13 +0900 | [diff] [blame] | 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> |
| 6 | #include <asm/ptrace.h> |
| 7 | |
| Paul Mundt | f15b2dc | 2008-12-10 19:18:46 +0900 | [diff] [blame] | 8 | /* The system call number is given by the user in R3 */ |
| Paul Mundt | fb4f87a | 2008-09-12 22:13:13 +0900 | [diff] [blame] | 9 | static inline long syscall_get_nr(struct task_struct *task, |
| 10 | struct pt_regs *regs) |
| 11 | { |
| 12 | return (regs->tra >= 0) ? regs->regs[3] : -1L; |
| 13 | } |
| 14 | |
| 15 | static inline void syscall_rollback(struct task_struct *task, |
| 16 | struct pt_regs *regs) |
| 17 | { |
| 18 | /* |
| 19 | * XXX: This needs some thought. On SH we don't |
| 20 | * save away the original r0 value anywhere. |
| 21 | */ |
| 22 | } |
| 23 | |
| 24 | static inline bool syscall_has_error(struct pt_regs *regs) |
| 25 | { |
| 26 | return (regs->sr & 0x1) ? true : false; |
| 27 | } |
| 28 | static inline void syscall_set_error(struct pt_regs *regs) |
| 29 | { |
| 30 | regs->sr |= 0x1; |
| 31 | } |
| 32 | static inline void syscall_clear_error(struct pt_regs *regs) |
| 33 | { |
| 34 | regs->sr &= ~0x1; |
| 35 | } |
| 36 | |
| 37 | static inline long syscall_get_error(struct task_struct *task, |
| 38 | struct pt_regs *regs) |
| 39 | { |
| 40 | return syscall_has_error(regs) ? regs->regs[0] : 0; |
| 41 | } |
| 42 | |
| 43 | static inline long syscall_get_return_value(struct task_struct *task, |
| 44 | struct pt_regs *regs) |
| 45 | { |
| 46 | return regs->regs[0]; |
| 47 | } |
| 48 | |
| 49 | static inline void syscall_set_return_value(struct task_struct *task, |
| 50 | struct pt_regs *regs, |
| 51 | int error, long val) |
| 52 | { |
| 53 | if (error) { |
| 54 | syscall_set_error(regs); |
| 55 | regs->regs[0] = -error; |
| 56 | } else { |
| 57 | syscall_clear_error(regs); |
| 58 | regs->regs[0] = val; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | static inline void syscall_get_arguments(struct task_struct *task, |
| 63 | struct pt_regs *regs, |
| 64 | unsigned int i, unsigned int n, |
| 65 | unsigned long *args) |
| 66 | { |
| 67 | /* |
| 68 | * Do this simply for now. If we need to start supporting |
| 69 | * fetching arguments from arbitrary indices, this will need some |
| 70 | * extra logic. Presently there are no in-tree users that depend |
| 71 | * on this behaviour. |
| 72 | */ |
| 73 | BUG_ON(i); |
| 74 | |
| 75 | /* Argument pattern is: R4, R5, R6, R7, R0, R1 */ |
| 76 | switch (n) { |
| 77 | case 6: args[5] = regs->regs[1]; |
| 78 | case 5: args[4] = regs->regs[0]; |
| 79 | case 4: args[3] = regs->regs[7]; |
| 80 | case 3: args[2] = regs->regs[6]; |
| 81 | case 2: args[1] = regs->regs[5]; |
| 82 | case 1: args[0] = regs->regs[4]; |
| 83 | break; |
| 84 | default: |
| 85 | BUG(); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | static inline void syscall_set_arguments(struct task_struct *task, |
| 90 | struct pt_regs *regs, |
| 91 | unsigned int i, unsigned int n, |
| 92 | const unsigned long *args) |
| 93 | { |
| 94 | /* Same note as above applies */ |
| 95 | BUG_ON(i); |
| 96 | |
| 97 | switch (n) { |
| 98 | case 6: regs->regs[1] = args[5]; |
| 99 | case 5: regs->regs[0] = args[4]; |
| 100 | case 4: regs->regs[7] = args[3]; |
| 101 | case 3: regs->regs[6] = args[2]; |
| 102 | case 2: regs->regs[5] = args[1]; |
| 103 | case 1: regs->regs[4] = args[0]; |
| 104 | break; |
| 105 | default: |
| 106 | BUG(); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | #endif /* __ASM_SH_SYSCALL_32_H */ |