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Linux/arch/sh/include/asm/syscall_32.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __ASM_SH_SYSCALL_32_H
  3 #define __ASM_SH_SYSCALL_32_H
  4 
  5 #include <uapi/linux/audit.h>
  6 #include <linux/kernel.h>
  7 #include <linux/sched.h>
  8 #include <linux/err.h>
  9 #include <asm/ptrace.h>
 10 
 11 /* The system call number is given by the user in R3 */
 12 static inline long syscall_get_nr(struct task_struct *task,
 13                                   struct pt_regs *regs)
 14 {
 15         return (regs->tra >= 0) ? regs->regs[3] : -1L;
 16 }
 17 
 18 static inline void syscall_rollback(struct task_struct *task,
 19                                     struct pt_regs *regs)
 20 {
 21         /*
 22          * XXX: This needs some thought. On SH we don't
 23          * save away the original r0 value anywhere.
 24          */
 25 }
 26 
 27 static inline long syscall_get_error(struct task_struct *task,
 28                                      struct pt_regs *regs)
 29 {
 30         return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
 31 }
 32 
 33 static inline long syscall_get_return_value(struct task_struct *task,
 34                                             struct pt_regs *regs)
 35 {
 36         return regs->regs[0];
 37 }
 38 
 39 static inline void syscall_set_return_value(struct task_struct *task,
 40                                             struct pt_regs *regs,
 41                                             int error, long val)
 42 {
 43         if (error)
 44                 regs->regs[0] = -error;
 45         else
 46                 regs->regs[0] = val;
 47 }
 48 
 49 static inline void syscall_get_arguments(struct task_struct *task,
 50                                          struct pt_regs *regs,
 51                                          unsigned int i, unsigned int n,
 52                                          unsigned long *args)
 53 {
 54         /*
 55          * Do this simply for now. If we need to start supporting
 56          * fetching arguments from arbitrary indices, this will need some
 57          * extra logic. Presently there are no in-tree users that depend
 58          * on this behaviour.
 59          */
 60         BUG_ON(i);
 61 
 62         /* Argument pattern is: R4, R5, R6, R7, R0, R1 */
 63         switch (n) {
 64         case 6: args[5] = regs->regs[1];
 65         case 5: args[4] = regs->regs[0];
 66         case 4: args[3] = regs->regs[7];
 67         case 3: args[2] = regs->regs[6];
 68         case 2: args[1] = regs->regs[5];
 69         case 1: args[0] = regs->regs[4];
 70         case 0:
 71                 break;
 72         default:
 73                 BUG();
 74         }
 75 }
 76 
 77 static inline void syscall_set_arguments(struct task_struct *task,
 78                                          struct pt_regs *regs,
 79                                          unsigned int i, unsigned int n,
 80                                          const unsigned long *args)
 81 {
 82         /* Same note as above applies */
 83         BUG_ON(i);
 84 
 85         switch (n) {
 86         case 6: regs->regs[1] = args[5];
 87         case 5: regs->regs[0] = args[4];
 88         case 4: regs->regs[7] = args[3];
 89         case 3: regs->regs[6] = args[2];
 90         case 2: regs->regs[5] = args[1];
 91         case 1: regs->regs[4] = args[0];
 92                 break;
 93         default:
 94                 BUG();
 95         }
 96 }
 97 
 98 static inline int syscall_get_arch(void)
 99 {
100         int arch = AUDIT_ARCH_SH;
101 
102 #ifdef CONFIG_CPU_LITTLE_ENDIAN
103         arch |= __AUDIT_ARCH_LE;
104 #endif
105         return arch;
106 }
107 #endif /* __ASM_SH_SYSCALL_32_H */
108 

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