/usr/include/allegro/platform/al386wat.h is in liballegro4-dev 2:4.4.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* /\ _ \ /\_ \ /\_ \
* \ \ \L\ \\//\ \ \//\ \ __ __ _ __ ___
* \ \ __ \ \ \ \ \ \ \ /'__`\ /'_ `\/\`'__\/ __`\
* \ \ \/\ \ \_\ \_ \_\ \_/\ __//\ \L\ \ \ \//\ \L\ \
* \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
* \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
* /\____/
* \_/__/
*
* Inline functions (Watcom style 386 asm).
*
* By Shawn Hargreaves.
*
* See readme.txt for copyright information.
*/
#if (!defined ALLEGRO_WATCOM) || (!defined ALLEGRO_I386)
#error bad include
#endif
#ifdef ALLEGRO_IMPORT_GFX_ASM
/* _default_ds:
* Return a copy of the current %ds selector.
*/
int _default_ds(void);
#pragma aux _default_ds = \
" mov eax, 0 " \
" mov ax, ds " \
\
value [eax];
/* _my_cs:
* Return a copy of the current %cs selector.
*/
int _my_cs(void);
#pragma aux _my_cs = \
" mov eax, 0 " \
" mov ax, cs " \
\
value [eax];
/* bmp_write_line/bmp_read_line:
* Bank switch functions.
*/
uintptr_t _bmp_bank_switcher(BITMAP *bmp, int lyne, void *bank_switch);
#pragma aux _bmp_bank_switcher = \
" call ecx " \
\
parm [edx] [eax] [ecx] \
value [eax];
#define bmp_write_line(bmp, lyne) _bmp_bank_switcher(bmp, lyne, (void *)bmp->write_bank)
#define bmp_read_line(bmp, lyne) _bmp_bank_switcher(bmp, lyne, (void *)bmp->read_bank)
/* bmp_unwrite_line:
* Terminate bank switch function.
*/
void _bmp_unbank_switcher(BITMAP *bmp, void *bank_unswitcher);
#pragma aux _bmp_unbank_switcher = \
" call ecx " \
\
parm [edx] [ecx];
#define bmp_unwrite_line(bmp) _bmp_unbank_switcher(bmp, (void *)bmp->vtable->unwrite_bank)
#endif /* ALLEGRO_IMPORT_GFX_ASM */
#ifdef ALLEGRO_IMPORT_MATH_ASM
/* _set_errno_erange:
* Watcom's asm syntax doesn't provide any nice way to do this inline...
*/
AL_INLINE(void, _set_errno_erange, (void),
{
*allegro_errno = ERANGE;
})
/* fixadd:
* Fixed point (16.16) addition.
*/
fixed fixadd(fixed x, fixed y);
#pragma aux fixadd = \
" add eax, edx " \
" jno Out1 " \
" call _set_errno_erange " \
" mov eax, 0x7FFFFFFF " \
" cmp edx, 0 " \
" jg Out1 " \
" neg eax " \
" Out1: " \
\
parm [eax] [edx] \
value [eax];
/* fixsub:
* Fixed point (16.16) subtraction.
*/
fixed fixsub(fixed x, fixed y);
#pragma aux fixsub = \
" sub eax, edx " \
" jno Out1 " \
" call _set_errno_erange " \
" mov eax, 0x7FFFFFFF " \
" cmp edx, 0 " \
" jl Out1 " \
" neg eax " \
" Out1: " \
\
parm [eax] [edx] \
value [eax];
/* fixmul:
* Fixed point (16.16) multiplication.
*/
fixed fixmul(fixed x, fixed y);
#pragma aux fixmul = \
" mov eax, ebx " \
" imul ecx " \
" shrd eax, edx, 16 " \
" sar edx, 15 " \
" jz Out2 " \
" cmp edx, -1 " \
" jz Out2 " \
" call _set_errno_erange " \
" mov eax, 0x7FFFFFFF " \
" cmp ebx, 0 " \
" jge Out1 " \
" neg eax " \
" Out1: " \
" cmp ecx, 0 " \
" jge Out2 " \
" neg eax " \
" Out2: " \
\
parm [ebx] [ecx] \
modify [edx] \
value [eax];
/* fixdiv:
* Fixed point (16.16) division.
*/
fixed fixdiv(fixed x, fixed y);
#pragma aux fixdiv = \
" xor ebx, ebx " \
" or eax, eax " \
" jns Out1 " \
" neg eax " \
" inc ebx " \
" Out1: " \
" or ecx, ecx " \
" jns Out2 " \
" neg ecx " \
" inc ebx " \
" Out2: " \
" mov edx, eax " \
" shr edx, 0x10 " \
" shl eax, 0x10 " \
" cmp edx, ecx " \
" jae Out3 " \
" div ecx " \
" or eax, eax " \
" jns Out4 " \
" Out3: " \
" call _set_errno_erange " \
" mov eax, 0x7FFFFFFF " \
" Out4: " \
" test ebx, 1 " \
" je Out5 " \
" neg eax " \
" Out5: " \
\
parm [eax] [ecx] \
modify [ebx edx] \
value [eax];
/* fixfloor :
* Fixed point version of floor().
* Note that it returns an integer result (not a fixed one)
*/
int fixfloor(fixed x);
#pragma aux fixfloor = \
" sar eax, 0x10 " \
\
parm [eax] \
value [eax];
/* fixceil :
* Fixed point version of ceil().
* Note that it returns an integer result (not a fixed one)
*/
int fixceil(fixed x);
#pragma aux fixceil = \
" add eax, 0xFFFF " \
" jns Out1 " \
" jo Out2 " \
" Out1: " \
" sar eax, 0x10 " \
" jmp Out3 " \
" Out2: " \
" call _set_errno_erange " \
" mov eax, 0x7FFF " \
" Out3: " \
\
parm [eax] \
value [eax];
#endif /* ALLEGRO_IMPORT_MATH_ASM */
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