arch/sparc/include/asm/syscall.h

   1 #ifndef __ASM_SPARC_SYSCALL_H
   2 #define __ASM_SPARC_SYSCALL_H
   3
   4 #include <uapi/linux/audit.h>
   5 #include <linux/kernel.h>
   6 #include <linux/compat.h>
   7 #include <linux/sched.h>
   8 #include <asm/ptrace.h>
   9 #include <asm/thread_info.h>
  10
  11 /*
  12  * The syscall table always contains 32 bit pointers since we know that the
  13  * address of the function to be called is (way) below 4GB.  So the "int"
  14  * type here is what we want [need] for both 32 bit and 64 bit systems.
  15  */
  16 extern const unsigned int sys_call_table[];
  17
  18 /* The system call number is given by the user in %g1 */
  19 static inline long syscall_get_nr(struct task_struct *task,
  20                                   struct pt_regs *regs)
  21 {
  22         int syscall_p = pt_regs_is_syscall(regs);
  23
  24         return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
  25 }
  26
  27 static inline void syscall_rollback(struct task_struct *task,
  28                                     struct pt_regs *regs)
  29 {
  30         /* XXX This needs some thought.  On Sparc we don't
  31          * XXX save away the original %o0 value somewhere.
  32          * XXX Instead we hold it in register %l5 at the top
  33          * XXX level trap frame and pass this down to the signal
  34          * XXX dispatch code which is the only place that value
  35          * XXX ever was needed.
  36          */
  37 }
  38
  39 #ifdef CONFIG_SPARC32
  40 static inline bool syscall_has_error(struct pt_regs *regs)
  41 {
  42         return (regs->psr & PSR_C) ? true : false;
  43 }
  44 static inline void syscall_set_error(struct pt_regs *regs)
  45 {
  46         regs->psr |= PSR_C;
  47 }
  48 static inline void syscall_clear_error(struct pt_regs *regs)
  49 {
  50         regs->psr &= ~PSR_C;
  51 }
  52 #else
  53 static inline bool syscall_has_error(struct pt_regs *regs)
  54 {
  55         return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
  56 }
  57 static inline void syscall_set_error(struct pt_regs *regs)
  58 {
  59         regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
  60 }
  61 static inline void syscall_clear_error(struct pt_regs *regs)
  62 {
  63         regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
  64 }
  65 #endif
  66
  67 static inline long syscall_get_error(struct task_struct *task,
  68                                      struct pt_regs *regs)
  69 {
  70         long val = regs->u_regs[UREG_I0];
  71
  72         return (syscall_has_error(regs) ? -val : 0);
  73 }
  74
  75 static inline long syscall_get_return_value(struct task_struct *task,
  76                                             struct pt_regs *regs)
  77 {
  78         long val = regs->u_regs[UREG_I0];
  79
  80         return val;
  81 }
  82
  83 static inline void syscall_set_return_value(struct task_struct *task,
  84                                             struct pt_regs *regs,
  85                                             int error, long val)
  86 {
  87         if (error) {
  88                 syscall_set_error(regs);
  89                 regs->u_regs[UREG_I0] = -error;
  90         } else {
  91                 syscall_clear_error(regs);
  92                 regs->u_regs[UREG_I0] = val;
  93         }
  94 }
  95
  96 static inline void syscall_get_arguments(struct task_struct *task,
  97                                          struct pt_regs *regs,
  98                                          unsigned int i, unsigned int n,
  99                                          unsigned long *args)
 100 {
 101         int zero_extend = 0;
 102         unsigned int j;
 103
 104 #ifdef CONFIG_SPARC64
 105         if (test_tsk_thread_flag(task, TIF_32BIT))
 106                 zero_extend = 1;
 107 #endif
 108
 109         for (j = 0; j < n; j++) {
 110                 unsigned long val = regs->u_regs[UREG_I0 + i + j];
 111
 112                 if (zero_extend)
 113                         args[j] = (u32) val;
 114                 else
 115                         args[j] = val;
 116         }
 117 }
 118
 119 static inline void syscall_set_arguments(struct task_struct *task,
 120                                          struct pt_regs *regs,
 121                                          unsigned int i, unsigned int n,
 122                                          const unsigned long *args)
 123 {
 124         unsigned int j;
 125
 126         for (j = 0; j < n; j++)
 127                 regs->u_regs[UREG_I0 + i + j] = args[j];
 128 }
 129
 130 static inline int syscall_get_arch(void)
 131 {
 132 #if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
 133         return in_compat_syscall() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
 134 #elif defined(CONFIG_SPARC64)
 135         return AUDIT_ARCH_SPARC64;
 136 #else
 137         return AUDIT_ARCH_SPARC;
 138 #endif
 139 }
 140
 141 #endif /* __ASM_SPARC_SYSCALL_H */