| David S. Miller | badcbf0 | 2008-07-27 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 | |
| 8 | /* The system call number is given by the user in %g1 */ |
| 9 | static inline long syscall_get_nr(struct task_struct *task, |
| 10 | struct pt_regs *regs) |
| 11 | { |
| 12 | int syscall_p = pt_regs_is_syscall(regs); |
| 13 | |
| 14 | return (syscall_p ? regs->u_regs[UREG_G1] : -1L); |
| 15 | } |
| 16 | |
| 17 | static inline void syscall_rollback(struct task_struct *task, |
| 18 | struct pt_regs *regs) |
| 19 | { |
| 20 | /* XXX This needs some thought. On Sparc we don't |
| 21 | * XXX save away the original %o0 value somewhere. |
| 22 | * XXX Instead we hold it in register %l5 at the top |
| 23 | * XXX level trap frame and pass this down to the signal |
| 24 | * XXX dispatch code which is the only place that value |
| 25 | * XXX ever was needed. |
| 26 | */ |
| 27 | } |
| 28 | |
| 29 | #ifdef CONFIG_SPARC32 |
| 30 | static inline bool syscall_has_error(struct pt_regs *regs) |
| 31 | { |
| 32 | return (regs->psr & PSR_C) ? true : false; |
| 33 | } |
| 34 | static inline void syscall_set_error(struct pt_regs *regs) |
| 35 | { |
| 36 | regs->psr |= PSR_C; |
| 37 | } |
| 38 | static inline void syscall_clear_error(struct pt_regs *regs) |
| 39 | { |
| 40 | regs->psr &= ~PSR_C; |
| 41 | } |
| 42 | #else |
| 43 | static inline bool syscall_has_error(struct pt_regs *regs) |
| 44 | { |
| 45 | return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false; |
| 46 | } |
| 47 | static inline void syscall_set_error(struct pt_regs *regs) |
| 48 | { |
| 49 | regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY); |
| 50 | } |
| 51 | static inline void syscall_clear_error(struct pt_regs *regs) |
| 52 | { |
| 53 | regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY); |
| 54 | } |
| 55 | #endif |
| 56 | |
| 57 | static inline long syscall_get_error(struct task_struct *task, |
| 58 | struct pt_regs *regs) |
| 59 | { |
| 60 | long val = regs->u_regs[UREG_I0]; |
| 61 | |
| 62 | return (syscall_has_error(regs) ? -val : 0); |
| 63 | } |
| 64 | |
| 65 | static inline long syscall_get_return_value(struct task_struct *task, |
| 66 | struct pt_regs *regs) |
| 67 | { |
| 68 | long val = regs->u_regs[UREG_I0]; |
| 69 | |
| 70 | return val; |
| 71 | } |
| 72 | |
| 73 | static inline void syscall_set_return_value(struct task_struct *task, |
| 74 | struct pt_regs *regs, |
| 75 | int error, long val) |
| 76 | { |
| 77 | if (error) { |
| 78 | syscall_set_error(regs); |
| 79 | regs->u_regs[UREG_I0] = -error; |
| 80 | } else { |
| 81 | syscall_clear_error(regs); |
| 82 | regs->u_regs[UREG_I0] = val; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static inline void syscall_get_arguments(struct task_struct *task, |
| 87 | struct pt_regs *regs, |
| 88 | unsigned int i, unsigned int n, |
| 89 | unsigned long *args) |
| 90 | { |
| 91 | int zero_extend = 0; |
| 92 | unsigned int j; |
| 93 | |
| 94 | #ifdef CONFIG_SPARC64 |
| 95 | if (test_tsk_thread_flag(task, TIF_32BIT)) |
| 96 | zero_extend = 1; |
| 97 | #endif |
| 98 | |
| 99 | for (j = 0; j < n; j++) { |
| 100 | unsigned long val = regs->u_regs[UREG_I0 + i + j]; |
| 101 | |
| 102 | if (zero_extend) |
| 103 | args[j] = (u32) val; |
| 104 | else |
| 105 | args[j] = val; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | static inline void syscall_set_arguments(struct task_struct *task, |
| 110 | struct pt_regs *regs, |
| 111 | unsigned int i, unsigned int n, |
| 112 | const unsigned long *args) |
| 113 | { |
| 114 | unsigned int j; |
| 115 | |
| 116 | for (j = 0; j < n; j++) |
| 117 | regs->u_regs[UREG_I0 + i + j] = args[j]; |
| 118 | } |
| 119 | |
| 120 | #endif /* __ASM_SPARC_SYSCALL_H */ |