arch/i386-all/include/aros/genmodule.h

   1 #ifndef AROS_I386_GENMODULE_H
   2 #define AROS_I386_GENMODULE_H
   3
   4 /*
   5     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   6     $Id$
   7
   8     NOTE: This file must compile *without* any other header !
   9
  10     Desc: CPU-specific genmodule definitions for 32-bit x86 processors
  11     Lang: english
  12 */
  13
  14 #include <exec/execbase.h>
  15
  16 /* Macros for generating library stub functions and aliases for stack libcalls. */
  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    Internals: a dummy function is used that will generate some
  25    unused junk code but otherwise we can't pass input arguments
  26    to the asm statement
  27 */
  28 #define __AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo) \
  29     void __ ## fname ## _ ## libbasename ## _wrapper(void) \
  30     { \
  31         asm volatile( \
  32             ".weak " #fname "\n" \
  33             #fname " :\n" \
  34             "\tmovl " #libbasename ", %%eax\n" \
  35             "\tjmp *%c0(%%eax)\n" \
  36             : : "i" ((-lvo*LIB_VECTSIZE)) \
  37         ); \
  38     }
  39 #define AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo) \
  40     __AROS_GM_LIBFUNCSTUB(fname, libbasename, lvo)
  41
  42 /* Macro: AROS_GM_RELLIBFUNCSTUB(functionname, libbasename, lvo)
  43    Same as AROS_GM_LIBFUNCSTUB but finds libbase at an offset in
  44    the current libbase
  45 */
  46 #define __AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo) \
  47     void __ ## fname ## _ ## libbasename ## _relwrapper(void) \
  48     { \
  49         asm volatile( \
  50             ".weak " #fname "\n" \
  51             "\t" #fname " :\n" \
  52             "\tcall __aros_getoffsettable\n" \
  53             "\taddl __aros_rellib_offset_" #libbasename ", %%eax\n" \
  54             "\tmovl (%%eax), %%eax\n" \
  55             "\tjmp *%c0(%%eax)\n" \
  56             : : "i" ((-lvo*LIB_VECTSIZE)) \
  57         ); \
  58     }
  59 #define AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo) \
  60     __AROS_GM_RELLIBFUNCSTUB(fname, libbasename, lvo)
  61
  62 /* Macro: AROS_GM_LIBFUNCALIAS(functionname, alias)
  63    This macro will generate an alias 'alias' for function
  64    'functionname'
  65 */
  66 #define __AROS_GM_LIBFUNCALIAS(fname, alias) \
  67     asm(".weak " #alias "\n" \
  68         "\t.set " #alias "," #fname \
  69     );
  70 #define AROS_GM_LIBFUNCALIAS(fname, alias) \
  71     __AROS_GM_LIBFUNCALIAS(fname, alias)
  72
  73
  74 /* Wrapper for stack calls - saves the current base
  75  * in the baseslot for this library
  76  *
  77  * Only needed for peropener libraries
  78  */
  79 #define __GM_STRINGIZE(x) #x
  80 #define __AROS_GM_STACKCALL(fname, libbasename, libfuncname) \
  81     void libfuncname(void); \
  82     void __ ## fname ## _stackcall(void) \
  83     { \
  84         asm volatile( \
  85             "\t" __GM_STRINGIZE(libfuncname) " :\n" \
  86             "\tpush %eax\n" \
  87             "\tcall __aros_setoffsettable\n" \
  88             "\tpop  %eax\n" \
  89             "\tjmp  " #fname "\n" \
  90         ); \
  91     }
  92
  93 #define AROS_GM_STACKCALL(fname, libbasename, lvo) \
  94      __AROS_GM_STACKCALL(fname, libbasename, AROS_SLIB_ENTRY(fname, libbasename, lvo))
  95
  96
  97 /* Macro: AROS_GM_STACKALIAS(functionname, libbasename, lvo)
  98    This macro will generate an alias 'alias' for function
  99    'functionname'
 100 */
 101 #define __AROS_GM_STACKALIAS(fname, alias) \
 102     void alias(void); \
 103     asm(".weak " __GM_STRINGIZE(alias) "\n" \
 104         "\t.set " __GM_STRINGIZE(alias) "," #fname \
 105     );
 106 #define AROS_GM_STACKALIAS(fname, libbasename, lvo) \
 107     __AROS_GM_STACKALIAS(fname, AROS_SLIB_ENTRY(fname, libbasename, lvo))
 108
 109 #endif /* AROS_I386_GENMODULE_H */