arch/ppc-all/include/aros/cpu.h

   1 #ifndef AROS_PPC_CPU_H
   2 #define AROS_PPC_CPU_H
   3 /*
   4     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   5     $Id$
   6
   7     NOTE: This file must compile *without* any other header !
   8
   9     Desc: cpu.h include file for powerpc arch
  10     Lang: english
  11 */
  12
  13 /*
  14  * Some compilers may not provide these legacy defines
  15  * but many code out there relies on them
  16  */
  17 #ifndef __ppc__
  18 #define __ppc__
  19 #endif
  20 #ifndef __PPC__
  21 #define __PPC__
  22 #endif
  23
  24 /* Information about size and alignment,
  25  * the defines have to be numeric constants */
  26 #define AROS_STACK_GROWS_DOWNWARDS 1 /* Stack direction */
  27 #define AROS_BIG_ENDIAN            1 /* Big or little endian */
  28 #define AROS_SIZEOFULONG           4 /* Size of an ULONG */
  29 #define AROS_SIZEOFPTR             4 /* Size of a PTR */
  30 #define AROS_WORDALIGN             2 /* Alignment for WORD */
  31 #define AROS_LONGALIGN             4 /* Alignment for LONG */
  32 #define AROS_QUADALIGN             8 /* Alignment for QUAD */
  33 #define AROS_PTRALIGN              4 /* Alignment for PTR */
  34 #define AROS_IPTRALIGN             4 /* Alignment for IPTR */
  35 #define AROS_DOUBLEALIGN           4 /* Alignment for double */
  36 #define AROS_WORSTALIGN           16 /* Worst case alignment */
  37 #define AROS_STACKALIGN           16 /* Stack alignment, see note below */
  38
  39 /*
  40  * PowerPC note:
  41  * Some (or maybe even all) PowerPC machines expect the stack to be aligned on 16-byte boundary.
  42  * This is the reason number one for AROS_WORSTALIGN=16. The second reason is, the 440 CPU will
  43  * generate an alignment exception if floating point data *crosses* the 16-byte boundary.
  44  */
  45
  46 #define AROS_32BIT_TYPE         int
  47 /* For ABI V1 this should be done in common cpu.h */
  48 #define AROS_LARGEST_TYPE   long long
  49
  50 /* Use C pointer and string for the BCPL pointers and strings
  51  * For a normal ABI these should not be defined for maximum source code
  52  * compatibility.
  53  */
  54 #define AROS_FAST_BPTR 1
  55 #define AROS_FAST_BSTR 1
  56
  57 /* do we need a function attribute to get parameters on the stack? */
  58 #define __stackparm
  59
  60 /* define this if we have no support for linear varargs in the compiler */
  61 #define NO_LINEAR_VARARGS 1
  62
  63 #define AROS_SLOWSTACKTAGS      1
  64 #define AROS_SLOWSTACKMETHODS   1
  65 #define AROS_SLOWSTACKHOOKS     1
  66
  67 /* types and limits for sig_atomic_t */
  68 #define AROS_SIG_ATOMIC_T       int
  69 #define AROS_SIG_ATOMIC_MIN     (-0x7fffffff-1)
  70 #define AROS_SIG_ATOMIC_MAX     0x7fffffff
  71
  72 #if defined(__GNUC__) && !defined(__clang__)
  73 register unsigned char* AROS_GET_SP __asm__("%sp");
  74 #endif
  75
  76 /*
  77      An offset value sometimes added to
  78      or subtracted from the stack limits.
  79 */
  80
  81 #define SP_OFFSET 0x10
  82
  83 /*
  84     One entry in a libraries' jumptable. For assembler compatibility, the
  85     field jmp should contain the code for an absolute jmp to a 32bit
  86     address. There are also a couple of macros which you should use to
  87     access the vector table from C.
  88 */
  89 struct FullJumpVec
  90 {
  91     unsigned long addis; // simplified: lis   11, a@h
  92     unsigned long ori;   //           : li    11, a@l
  93     unsigned long mtspr; //           : mtctr 11
  94     unsigned long jmp;   // bcctr     : bctr  11
  95 };
  96 /* browse MPCFPE32B.pdf to understand opcode creation */
  97 #define __AROS_SET_FULLJMP(v,a)\
  98 {\
  99     struct FullJumpVec *_v = (v);                                                \
 100     _v->addis = (15 << 26) | (11 << 21) | ((ULONG)(a) >> 16);                    \
 101     _v->ori   = (24 << 26) | (11 << 21) | (11 << 16) | ((ULONG)(a) & 0x0000FFFF);\
 102     _v->mtspr = (31 << 26) | (11 << 21) | ( 9 << 16) | (467 << 1);               \
 103     _v->jmp   = (19 << 26) | (20 << 21) | (528 << 1);                            \
 104 }
 105
 106 struct JumpVec
 107 {
 108     void *vec;
 109 };
 110
 111 /* Use these to access a vector table */
 112 #define LIB_VECTSIZE                    (sizeof (struct JumpVec))
 113 #define __AROS_GETJUMPVEC(lib,n)        (&((struct JumpVec *)lib)[-(n)])
 114 #define __AROS_GETVECADDR(lib,n)        (__AROS_GETJUMPVEC(lib,n)->vec)
 115 #define __AROS_SETVECADDR(lib,n,addr)   (__AROS_GETJUMPVEC(lib,n)->vec = (addr))
 116 #define __AROS_INITVEC(lib,n)           __AROS_SETVECADDR(lib,n,_aros_not_implemented)
 117 #define __AROS_USE_FULLJMP
 118
 119 /*
 120    No, we do not want to preserve the all registers in case of Semaphore and
 121    multitasking handling functions. It made sence on m68k native target. On all
 122    other targets the standard ABI rules the AROS world anyway...
 123 */
 124 #undef UseExecstubs
 125
 126 /* Macros to test/set failure of AllocEntry() */
 127 #define AROS_ALLOCENTRY_FAILED(memType) \
 128         ((struct MemList *)((IPTR)(memType) | 0x80ul<<(sizeof(APTR)-1)*8))
 129 #define AROS_CHECK_ALLOCENTRY(memList) \
 130         (!((IPTR)(memList) & 0x80ul<<(sizeof(APTR)-1)*8))
 131
 132 /*
 133     Find the next valid alignment for a structure if the next x bytes must
 134     be skipped.
 135 */
 136 #define AROS_ALIGN(x)        (((x)+AROS_WORSTALIGN-1)&-AROS_WORSTALIGN)
 137
 138 /* Prototypes */
 139 extern void _aros_not_implemented (char *);
 140
 141 /* How much stack do we need ? Lots :-) */
 142 #define AROS_STACKSIZE  40960
 143
 144 /* How to map function arguments to CPU registers */
 145 /*
 146     The i386 processor doesn't have enough registers to map the m68k
 147     register set onto them - so simply use the compiler's calling
 148     convention. The library base is mapped to the last argument so that
 149     it can be ignored by the function.
 150 */
 151
 152 /* What to do with the library base in header, prototype and call */
 153 #define __AROS_LH_BASE(basetype,basename)   basetype basename
 154 #define __AROS_LP_BASE(basetype,basename)   void *
 155 #define __AROS_LC_BASE(basetype,basename)   basename
 156 #define __AROS_LD_BASE(basetype,basename)   basetype
 157
 158 /* How to transform an argument in header, opt prototype, call and forced
 159    prototype. */
 160 #define __AROS_LHA(type,name,reg)     type name
 161 #define __AROS_LPA(type,name,reg)     type
 162 #define __AROS_LCA(type,name,reg)     name
 163 #define __AROS_LDA(type,name,reg)     type
 164 #define __AROS_UFHA(type,name,reg)    type name
 165 #define __AROS_UFPA(type,name,reg)    type
 166 #define __AROS_UFCA(type,name,reg)    name
 167 #define __AROS_UFDA(type,name,reg)    type
 168 #define __AROS_LHAQUAD(type,name,reg1,reg2)     type name
 169 #define __AROS_LPAQUAD(type,name,reg1,reg2)     type
 170 #define __AROS_LCAQUAD(type,name,reg1,reg2)     name
 171 #define __AROS_LDAQUAD(type,name,reg1,reg2)     type
 172
 173 /* Prefix for library function in header, prototype and call */
 174 #define __AROS_LH_PREFIX    /* eps */
 175 #define __AROS_LP_PREFIX    /* eps */
 176 #define __AROS_LC_PREFIX    /* eps */
 177 #define __AROS_LD_PREFIX    /* eps */
 178 #define __AROS_UFH_PREFIX   /* eps */
 179 #define __AROS_UFP_PREFIX   /* eps */
 180 #define __AROS_UFC_PREFIX   /* eps */
 181 #define __AROS_UFD_PREFIX   /* eps */
 182
 183 #endif /* AROS_PPC_CPU_H */