sys/arch/powerpc/include/reg.h

   1 /*      $NetBSD: reg.h,v 1.8 2002/07/05 18:45:21 matt Exp $     */
   2
   3 #ifndef _POWERPC_REG_H_
   4 #define _POWERPC_REG_H_
   5
   6 /*
   7  *  Register Usage according the SVR4 ABI for PPC.
   8  *
   9  *  Register    Usage
  10  *  r0          Volatile register which may be modified during function linkage
  11  *  r1          Stack fram pointer, always valid
  12  *  r2          System-reserved register
  13  *  r3-r4       Volatile registers used for parameter passing and return values
  14  *  r5-r10      Volatile registers used for parameter passing
  15  *  r11-r12     Volatile register which may be modified during function linkage
  16  *  r13         Small data area pointer register
  17  *  f0          Volatile register
  18  *  f1          Volatile registers used for parameter passing and return values
  19  *  f2-f8       Volatile registers used for parameter passing
  20  *  f9-f13      Volatile registers
  21  *
  22  *  [Start of callee-saved registers]
  23  *  r14-r30     Registers used for local variables
  24  *  r31         Used for local variable or "environent pointers"
  25  *  f14-f31     Registers used for local variables
  26  *
  27  *
  28  *  Register Usage according the ELF64 ABI (PowerOpen/AIX) for PPC.
  29  *
  30  *  Register    Usage
  31  *  r0          Volatile register which may be modified during function linkage
  32  *  r1          Stack fram pointer, always valid
  33  *  r2          TOC pointer
  34  *  r3          Volatile register used for parameter passing and return value
  35  *  r4-r10      Volatile registers used for parameter passing
  36  *  r11         Volatile register used in calls by pointer and as an
  37  *              environment pointr for languages which require one
  38  *  r12         Volatile register used for exception handling and glink code
  39  *  r13         Reserved for use as system thread ID
  40  *
  41  *  f0          Volatile register
  42  *  f1-f4       Volatile registers used for parameter passing and return values
  43  *  f5-f13      Volatile registers used for parameter passing
  44
  45  *  [Start of callee-saved registers]
  46  *  r14-r31     Registers used for local variables
  47  *  f14-f31     Registers used for local variables
  48  *
  49  */
  50
  51 struct reg {                            /* base registers */
  52         register_t fixreg[32];
  53         register_t lr;                  /* Link Register */
  54         int cr;                         /* Condition Register */
  55         int xer;                        /* SPR 1 */
  56         register_t ctr;                 /* Count Register */
  57         register_t pc;                  /* Program Counter */
  58 };
  59
  60 struct fpreg {                          /* Floating Point registers */
  61         double fpreg[32];
  62         double fpscr;                   /* Status and Control Register */
  63 };
  64
  65 struct vreg {                           /* Vector registers */
  66         u_int32_t vreg[32][4];
  67         register_t vrsave;              /* SPR 256 */
  68         register_t spare[2];            /* filler */
  69         register_t vscr;                /* Vector Status And Control Register */
  70 };
  71
  72 #endif /* _POWERPC_REG_H_ */