/usr/include/allegro/platform/al386gcc.h is in liballegro4-dev 2:4.4.2-7.
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 (gcc style 386 asm).
*
* By Shawn Hargreaves.
*
* See readme.txt for copyright information.
*/
#if (!defined ALLEGRO_GCC) || (!defined ALLEGRO_I386)
#error bad include
#endif
#ifdef ALLEGRO_IMPORT_GFX_ASM
/* _default_ds:
* Return a copy of the current %ds selector.
*/
AL_INLINE(int, _default_ds, (void),
{
short result;
__asm__ (
" movw %%ds, %0 "
: "=r" (result)
);
return result;
})
/* bmp_write_line:
* Bank switch function.
*/
AL_INLINE(uintptr_t, bmp_write_line, (BITMAP *bmp, int lyne),
{
uintptr_t result;
__asm__ volatile (
" call *%3 "
: "=a" (result) /* result in eax */
: "d" (bmp), /* bitmap in edx */
"0" (lyne), /* line number in eax */
"r" (bmp->write_bank) /* the bank switch routine */
);
return result;
})
/* bmp_read_line:
* Bank switch function.
*/
AL_INLINE(uintptr_t, bmp_read_line, (BITMAP *bmp, int lyne),
{
uintptr_t result;
__asm__ volatile (
" call *%3 "
: "=a" (result) /* result in eax */
: "d" (bmp), /* bitmap in edx */
"0" (lyne), /* line number in eax */
"r" (bmp->read_bank) /* the bank switch routine */
);
return result;
})
/* bmp_unwrite_line:
* Terminate bank switch function.
*/
AL_INLINE(void, bmp_unwrite_line, (BITMAP *bmp),
{
__asm__ volatile (
" call *%1 "
:
: "d" (bmp), /* bitmap in edx */
"r" (bmp->vtable->unwrite_bank) /* the bank switch routine */
);
})
#endif /* ALLEGRO_IMPORT_GFX_ASM */
#ifdef ALLEGRO_IMPORT_MATH_ASM
/* Helper macro that makes the compiler reduce fixadd(), fixsub(), fixmul() and
fixdiv() calls to a single constant if both operands are constant. Since
this doesn't work unless we compile with optimization, it's better to skip
the test then. */
#if (defined __OPTIMIZE__) && ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 95)))
#define __PRECALCULATE_CONSTANTS(calc) \
if(__builtin_constant_p(x) && __builtin_constant_p(y)) { \
if((calc) > (double)0x7FFFFFFF) { \
*allegro_errno = ERANGE; \
return 0x7FFFFFFF; \
} \
else if(-(calc) > (double)0x7FFFFFFF) { \
*allegro_errno = ERANGE; \
return -0x7FFFFFFF; \
} \
else \
return (fixed)(calc); \
} \
else
#else
#define __PRECALCULATE_CONSTANTS(calc)
#endif
/* fixadd:
* Fixed point (16.16) addition.
*/
AL_INLINE(fixed, fixadd, (fixed x, fixed y),
{
fixed result;
__PRECALCULATE_CONSTANTS(x + (double)y)
{
__asm__ (
" addl %2, %0 ; " /* do the addition */
" jno 0f ; " /* check for overflow */
" movl %4, %0 ; " /* on overflow, set errno */
" movl %3, (%0) ; "
" movl $0x7FFFFFFF, %0 ; " /* and return MAXINT */
" cmpl $0, %2 ; "
" jg 0f ; "
" negl %0 ; "
" 0: " /* finished */
: "=r" (result) /* result in a register */
: "0" (x), /* x in the output register */
"rm" (y), /* y can go in register or memory */
"i" (ERANGE),
"m" (allegro_errno)
: "%cc", "memory" /* clobbers flags and errno */
);
return result;
}
})
/* fixsub:
* Fixed point (16.16) subtraction.
*/
AL_INLINE(fixed, fixsub, (fixed x, fixed y),
{
fixed result;
__PRECALCULATE_CONSTANTS(x - (double)y)
{
__asm__ (
" subl %2, %0 ; " /* do the subtraction */
" jno 0f ; " /* check for overflow */
" movl %4, %0 ; " /* on overflow, set errno */
" movl %3, (%0) ; "
" movl $0x7FFFFFFF, %0 ; " /* and return MAXINT */
" cmpl $0, %2 ; "
" jl 0f ; "
" negl %0 ; "
" 0: " /* finished */
: "=r" (result) /* result in a register */
: "0" (x), /* x in the output register */
"rm" (y), /* y can go in register or memory */
"i" (ERANGE),
"m" (allegro_errno)
: "%cc", "memory" /* clobbers flags and errno */
);
return result;
}
})
/* fixmul:
* Fixed point (16.16) multiplication.
*/
AL_INLINE(fixed, fixmul, (fixed x, fixed y),
{
fixed edx __attribute__ ((__unused__));
fixed result;
__PRECALCULATE_CONSTANTS(x / 65536.0 * y)
{
__asm__ (
" movl %2, %%eax ; "
" imull %3 ; " /* do the multiply */
" shrdl $16, %%edx, %%eax ; "
" sarl $15, %%edx ; " /* check for overflow */
" jz 0f ; "
" cmpl $-1, %%edx ; "
" je 0f ; "
" movl %5, %%eax ; " /* on overflow, set errno */
" movl %4, (%%eax) ; "
" movl $0x7FFFFFFF, %%eax ; " /* and return MAXINT */
" cmpl $0, %2 ; "
" jge 1f ; "
" negl %%eax ; "
" 1: "
" cmpl $0, %3 ; "
" jge 0f ; "
" negl %%eax ; "
" .balign 4, 0x90 ; "
" 0: " /* finished */
: "=&a" (result), /* the result has to go in eax */
"=&d" (edx) /* reliably reserve edx */
: "mr" (x), /* x and y can be regs or mem */
"mr" (y),
"i" (ERANGE),
"m" (allegro_errno)
: "%cc", "memory" /* clobbers flags and errno */
);
return result;
}
})
/* fixdiv:
* Fixed point (16.16) division.
*/
AL_INLINE(fixed, fixdiv, (fixed x, fixed y),
{
fixed edx __attribute__ ((__unused__));
fixed reg __attribute__ ((__unused__));
fixed result;
__PRECALCULATE_CONSTANTS(x * 65536.0 / y)
{
__asm__ (
" testl %%eax, %%eax ; " /* test sign of x */
" js 3f ; "
" testl %2, %2 ; " /* test sign of y */
" jns 4f ; "
" negl %2 ; "
" 0: " /* result will be negative */
" movl %%eax, %%edx ; " /* check the range is ok */
" shrl $16, %%edx ; "
" shll $16, %%eax ; "
" cmpl %2, %%edx ; "
" jae 1f ; "
" divl %2 ; " /* do the divide */
" testl %%eax, %%eax ; "
" jns 2f ; "
" 1: "
" movl %6, %%eax ; " /* on overflow, set errno */
" movl %5, (%%eax) ; "
" movl $0x7FFFFFFF, %%eax ; " /* and return MAXINT */
" 2: "
" negl %%eax ; " /* fix up the sign of the result */
" jmp 6f ; "
" .balign 4, 0x90 ; "
" 3: " /* x is negative */
" negl %%eax ; "
" testl %2, %2 ; " /* test sign of y */
" jns 0b ; "
" negl %2 ; "
" 4: " /* result will be positive */
" movl %%eax, %%edx ; " /* check the range is ok */
" shrl $16, %%edx ; "
" shll $16, %%eax ; "
" cmpl %2, %%edx ; "
" jae 5f ; "
" divl %2 ; " /* do the divide */
" testl %%eax, %%eax ; "
" jns 6f ; "
" 5: "
" movl %6, %%eax ; " /* on overflow, set errno */
" movl %5, (%%eax) ; "
" movl $0x7FFFFFFF, %%eax ; " /* and return MAXINT */
" 6: " /* finished */
: "=a" (result), /* the result has to go in eax */
"=&d" (edx), /* reliably reserve edx */
"=r" (reg) /* input operand will be clobbered */
: "0" (x), /* x in eax */
"2" (y), /* y in register */
"i" (ERANGE),
"m" (allegro_errno)
: "%cc", "memory" /* clobbers flags and memory */
);
return result;
}
})
/* fixfloor:
* Fixed point version of floor().
* Note that it returns an integer result (not a fixed one)
*/
AL_INLINE(int, fixfloor, (fixed x),
{
int result;
__asm__ (
" sarl $16, %0 " /* convert to int */
: "=r" (result) /* result in a register */
: "0" (x) /* x in the output register */
);
return result;
})
/* fixceil:
* Fixed point version of ceil().
* Note that it returns an integer result (not a fixed one)
*/
AL_INLINE(int, fixceil, (fixed x),
{
int result;
__asm__ (
" addl $0xFFFF, %0 ;" /* ceil () */
" jns 0f ;"
" jo 1f ;"
"0:"
" sarl $16, %0 ;" /* convert to int */
" jmp 2f ;"
"1:"
" movl %3, %0 ;" /* on overflow, set errno */
" movl %2, (%0) ;"
" movl $0x7FFF, %0 ;" /* and return large int */
"2:"
: "=r" (result) /* result in a register */
: "0" (x), /* x in the output register */
"i" (ERANGE),
"m" (allegro_errno)
: "%cc", "memory" /* clobbers flags and errno */
);
return result;
})
#undef __PRECALCULATE_CONSTANTS
#endif /* ALLEGRO_IMPORT_MATH_ASM */
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