arch/sh/include/asm/syscall_32.h

   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 */