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