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 /* 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 */ 13 extern const unsigned int sys_call_table[]; 14 15 /* The system call number is given by the user in %g1 */ 16 static 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 24 static 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 37 static inline bool syscall_has_error(struct pt_regs *regs) 38 { 39 return (regs->psr & PSR_C) ? true : false; 40 } 41 static inline void syscall_set_error(struct pt_regs *regs) 42 { 43 regs->psr |= PSR_C; 44 } 45 static inline void syscall_clear_error(struct pt_regs *regs) 46 { 47 regs->psr &= ~PSR_C; 48 } 49 #else 50 static inline bool syscall_has_error(struct pt_regs *regs) 51 { 52 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false; 53 } 54 static inline void syscall_set_error(struct pt_regs *regs) 55 { 56 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY); 57 } 58 static inline void syscall_clear_error(struct pt_regs *regs) 59 { 60 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY); 61 } 62 #endif 63 64 static 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 72 static 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 80 static 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 93 static 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 } 115 116 static 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 */ 128