arch/arm-all/include/aros/genmodule.h

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: genmodule.h include file for arm-le systems
   6     Lang: english
   7 */
   8
   9 #ifndef AROS_ARM_GENMODULE_H
  10 #define AROS_ARM_GENMODULE_H
  11
  12 #include <exec/execbase.h>
  13
  14 /* Macros for generating library stub functions and aliases for stack libcalls. */
  15
  16 /******************* Linklib Side Thunks ******************/
  17
  18 /* Macro: AROS_GM_LIBFUNCSTUB(functionname, libbasename, lvo)
  19    This macro will generate code for a stub function for
  20    the function 'functionname' of lirary with libbase
  21    'libbasename' and 'lvo' number of the function in the
  22    vector table. lvo has to be a constant value (not a variable)
  23 */
  24 #define __AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo)                     \
  25     void __ ## fname ## _ ## libbasename ## _wrapper(void)              \
  26     {                                                                   \
  27         asm volatile(                                                   \
  28             ".weak " #fname "\n"                                        \
  29             ".type " #fname ", %%function\n"                            \
  30             #fname " :\n"                                               \
  31             /* r12 = libbase */                                         \
  32             "\tldr r12, 1f\n"                                           \
  33             "\tldr r12, [r12]\n"                                        \
  34             /* Compute function address and jump */                     \
  35             "\tldr pc, [r12, #%c0]\n"                                   \
  36             ".align 2\n"                                                \
  37             "1: .word " #libbasename "\n"                               \
  38             : : "i" ((-lvo*LIB_VECTSIZE))                               \
  39         );                                                              \
  40     }
  41 #define AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo) \
  42     __AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo)
  43
  44 /* Macro: AROS_GM_RELLIBFUNCSTUB(functionname, libbasename, lvo)
  45    Same as AROS_GM_LIBFUNCSTUB but finds libbase at an offset in
  46    the current libbase
  47 */
  48 #define __AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo)                  \
  49     void __ ## fname ## _ ## libbasename ## _relwrapper(IPTR args)      \
  50     {                                                                   \
  51         asm volatile(                                                   \
  52             ".weak " #fname "\n"                                        \
  53             ".type " #fname ", %%function\n"                            \
  54             #fname " :\n"                                               \
  55             /* return address is in lr register */                      \
  56             /* Up to four parameters are in r0 - r3 , the rest are on stack */ \
  57             "\tpush {r0, r1, r2, r3, lr}\n"                             \
  58             /* r0 = __aros_getoffsettable() */                          \
  59             "\tbl  __aros_getoffsettable\n"                             \
  60             /* r12 = libbase */                                         \
  61             "\tldr r1, 1f\n"                                            \
  62             "\tldr r1, [r1]\n"                                          \
  63             "\tldr r12, [r0, r1]\n"                                     \
  64             /* Restore original arguments */                            \
  65             "\tpop {r0, r1, r2, r3, lr}\n"                              \
  66             /* Compute function address and jump */                     \
  67             "\tldr pc, [r12, #%c0]\n"                                   \
  68             "1: .word __aros_rellib_offset_" #libbasename "\n"                        \
  69             "2: .word __aros_getoffsettable\n"                          \
  70             : : "i" ((-lvo*LIB_VECTSIZE))                               \
  71         );                                                              \
  72     }
  73 #define AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo) \
  74     __AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo)
  75
  76 /* Macro: AROS_GM_LIBFUNCALIAS(functionname, alias)
  77    This macro will generate an alias 'alias' for function
  78    'functionname'
  79 */
  80 #define __AROS_GM_LIBFUNCALIAS(fname, alias) \
  81     asm(".weak " #alias "\n" \
  82         "\t.set " #alias "," #fname \
  83     );
  84 #define AROS_GM_LIBFUNCALIAS(fname, alias) \
  85     __AROS_GM_LIBFUNCALIAS(fname, alias)
  86
  87 /******************* Library Side Thunks ******************/
  88
  89 /* This macro relies upon the fact that the
  90  * caller to a stack function will have passed in
  91  * the base in %r12, since the caller will
  92  * have used the AROS_LIBFUNCSTUB() macro.
  93  */
  94 #define __GM_STRINGIZE(x) #x
  95 #define __AROS_GM_STACKCALL(fname, libbasename, libfuncname)               \
  96     void libfuncname(void);                                             \
  97     void __ ## fname ## _stackcall(void)                                \
  98     {                                                                   \
  99         asm volatile(                                                   \
 100             "\t" __GM_STRINGIZE(libfuncname) " :\n"                        \
 101             /* Up to four parameters are in r0 - r3 , the rest are on stack */ \
 102             "\tpush {r0, r1, r2, r3, lr}\n"                             \
 103             "\tmov  r0, r12\n"                                          \
 104             "\tbl   __aros_setoffsettable\n"                            \
 105             "\tpop  {r0, r1, r2, r3, lr}\n"                             \
 106             "\tb   " #fname "\n"                                        \
 107         );                                                              \
 108     }
 109
 110 #define AROS_GM_STACKCALL(fname, libbasename, lvo) \
 111      __AROS_GM_STACKCALL(fname, libbasename, AROS_SLIB_ENTRY(fname, libbasename, lvo))
 112
 113 /* Macro: AROS_GM_STACKALIAS(functionname, libbasename, lvo)
 114    This macro will generate an alias 'alias' for function
 115    'functionname'
 116 */
 117 #define __AROS_GM_STACKALIAS(fname, alias) \
 118     void alias(void); \
 119     asm(".weak " __GM_STRINGIZE(alias) "\n" \
 120         "\t.set " __GM_STRINGIZE(alias) "," #fname \
 121     );
 122 #define AROS_GM_STACKALIAS(fname, libbasename, lvo) \
 123     __AROS_GM_STACKALIAS(fname, AROS_SLIB_ENTRY(fname, libbasename, lvo))
 124
 125 #endif /* AROS_ARM_GENMODULE_H */