src/stdlib/SDL_stdlib.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* This file contains portable stdlib functions for SDL */

#include "SDL_stdinc.h"

#ifndef HAVE_LIBC
/* These are some C runtime intrinsics that need to be defined */

#if defined(_MSC_VER)

#ifndef __FLTUSED__
#define __FLTUSED__
__declspec(selectany) int _fltused = 1;
#endif

#ifdef _WIN64

#else

void
__declspec(naked)
_chkstk()
{
}

/* Float to long */
void
__declspec(naked)
_ftol()
{
    /* *INDENT-OFF* */
    __asm {
        push        ebp
        mov         ebp,esp
        sub         esp,20h
        and         esp,0FFFFFFF0h
        fld         st(0)
        fst         dword ptr [esp+18h]
        fistp       qword ptr [esp+10h]
        fild        qword ptr [esp+10h]
        mov         edx,dword ptr [esp+18h]
        mov         eax,dword ptr [esp+10h]
        test        eax,eax
        je          integer_QnaN_or_zero
arg_is_not_integer_QnaN:
        fsubp       st(1),st
        test        edx,edx
        jns         positive
        fstp        dword ptr [esp]
        mov         ecx,dword ptr [esp]
        xor         ecx,80000000h
        add         ecx,7FFFFFFFh
        adc         eax,0
        mov         edx,dword ptr [esp+14h]
        adc         edx,0
        jmp         localexit
positive:
        fstp        dword ptr [esp]
        mov         ecx,dword ptr [esp]
        add         ecx,7FFFFFFFh
        sbb         eax,0
        mov         edx,dword ptr [esp+14h]
        sbb         edx,0
        jmp         localexit
integer_QnaN_or_zero:
        mov         edx,dword ptr [esp+14h]
        test        edx,7FFFFFFFh
        jne         arg_is_not_integer_QnaN
        fstp        dword ptr [esp+18h]
        fstp        dword ptr [esp+18h]
localexit:
        leave
        ret
    }
    /* *INDENT-ON* */
}

void
_ftol2_sse()
{
    _ftol();
}

/* 64-bit math operators for 32-bit systems */
void
__declspec(naked)
_allmul()
{
    /* *INDENT-OFF* */
    __asm {
        push        ebp
        mov         ebp,esp
        push        edi
        push        esi
        push        ebx
        sub         esp,0Ch
        mov         eax,dword ptr [ebp+10h]
        mov         edi,dword ptr [ebp+8]
        mov         ebx,eax
        mov         esi,eax
        sar         esi,1Fh
        mov         eax,dword ptr [ebp+8]
        mul         ebx
        imul        edi,esi
        mov         ecx,edx
        mov         dword ptr [ebp-18h],eax
        mov         edx,dword ptr [ebp+0Ch]
        add         ecx,edi
        imul        ebx,edx
        mov         eax,dword ptr [ebp-18h]
        lea         ebx,[ebx+ecx]
        mov         dword ptr [ebp-14h],ebx
        mov         edx,dword ptr [ebp-14h]
        add         esp,0Ch
        pop         ebx
        pop         esi
        pop         edi
        pop         ebp
        ret
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_alldiv()
{
    /* *INDENT-OFF* */
    __asm {
        push        edi
        push        esi
        push        ebx
        xor         edi,edi
        mov         eax,dword ptr [esp+14h]
        or          eax,eax
        jge         L1
        inc         edi
        mov         edx,dword ptr [esp+10h]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+14h],eax
        mov         dword ptr [esp+10h],edx
L1:
        mov         eax,dword ptr [esp+1Ch]
        or          eax,eax
        jge         L2
        inc         edi
        mov         edx,dword ptr [esp+18h]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+1Ch],eax
        mov         dword ptr [esp+18h],edx
L2:
        or          eax,eax
        jne         L3
        mov         ecx,dword ptr [esp+18h]
        mov         eax,dword ptr [esp+14h]
        xor         edx,edx
        div         ecx
        mov         ebx,eax
        mov         eax,dword ptr [esp+10h]
        div         ecx
        mov         edx,ebx
        jmp         L4
L3:
        mov         ebx,eax
        mov         ecx,dword ptr [esp+18h]
        mov         edx,dword ptr [esp+14h]
        mov         eax,dword ptr [esp+10h]
L5:
        shr         ebx,1
        rcr         ecx,1
        shr         edx,1
        rcr         eax,1
        or          ebx,ebx
        jne         L5
        div         ecx
        mov         esi,eax
        mul         dword ptr [esp+1Ch]
        mov         ecx,eax
        mov         eax,dword ptr [esp+18h]
        mul         esi
        add         edx,ecx
        jb          L6
        cmp         edx,dword ptr [esp+14h]
        ja          L6
        jb          L7
        cmp         eax,dword ptr [esp+10h]
        jbe         L7
L6:
        dec         esi
L7:
        xor         edx,edx
        mov         eax,esi
L4:
        dec         edi
        jne         L8
        neg         edx
        neg         eax
        sbb         edx,0
L8:
        pop         ebx
        pop         esi
        pop         edi
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_aulldiv()
{
    /* *INDENT-OFF* */
    __asm {
        push        ebx
        push        esi
        mov         eax,dword ptr [esp+18h]
        or          eax,eax
        jne         L1
        mov         ecx,dword ptr [esp+14h]
        mov         eax,dword ptr [esp+10h]
        xor         edx,edx
        div         ecx
        mov         ebx,eax
        mov         eax,dword ptr [esp+0Ch]
        div         ecx
        mov         edx,ebx
        jmp         L2
L1:
        mov         ecx,eax
        mov         ebx,dword ptr [esp+14h]
        mov         edx,dword ptr [esp+10h]
        mov         eax,dword ptr [esp+0Ch]
L3:
        shr         ecx,1
        rcr         ebx,1
        shr         edx,1
        rcr         eax,1
        or          ecx,ecx
        jne         L3
        div         ebx
        mov         esi,eax
        mul         dword ptr [esp+18h]
        mov         ecx,eax
        mov         eax,dword ptr [esp+14h]
        mul         esi
        add         edx,ecx
        jb          L4
        cmp         edx,dword ptr [esp+10h]
        ja          L4
        jb          L5
        cmp         eax,dword ptr [esp+0Ch]
        jbe         L5
L4:
        dec         esi
L5:
        xor         edx,edx
        mov         eax,esi
L2:
        pop         esi
        pop         ebx
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_allrem()
{
    /* *INDENT-OFF* */
    __asm {
        push        ebx
        push        edi
        xor         edi,edi
        mov         eax,dword ptr [esp+10h]
        or          eax,eax
        jge         L1
        inc         edi
        mov         edx,dword ptr [esp+0Ch]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+10h],eax
        mov         dword ptr [esp+0Ch],edx
L1:
        mov         eax,dword ptr [esp+18h]
        or          eax,eax
        jge         L2
        mov         edx,dword ptr [esp+14h]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+18h],eax
        mov         dword ptr [esp+14h],edx
L2:
        or          eax,eax
        jne         L3
        mov         ecx,dword ptr [esp+14h]
        mov         eax,dword ptr [esp+10h]
        xor         edx,edx
        div         ecx
        mov         eax,dword ptr [esp+0Ch]
        div         ecx
        mov         eax,edx
        xor         edx,edx
        dec         edi
        jns         L4
        jmp         L8
L3:
        mov         ebx,eax
        mov         ecx,dword ptr [esp+14h]
        mov         edx,dword ptr [esp+10h]
        mov         eax,dword ptr [esp+0Ch]
L5:
        shr         ebx,1
        rcr         ecx,1
        shr         edx,1
        rcr         eax,1
        or          ebx,ebx
        jne         L5
        div         ecx
        mov         ecx,eax
        mul         dword ptr [esp+18h]
        xchg        eax,ecx
        mul         dword ptr [esp+14h]
        add         edx,ecx
        jb          L6
        cmp         edx,dword ptr [esp+10h]
        ja          L6
        jb          L7
        cmp         eax,dword ptr [esp+0Ch]
        jbe         L7
L6:
        sub         eax,dword ptr [esp+14h]
        sbb         edx,dword ptr [esp+18h]
L7:
        sub         eax,dword ptr [esp+0Ch]
        sbb         edx,dword ptr [esp+10h]
        dec         edi
        jns         L8
L4:
        neg         edx
        neg         eax
        sbb         edx,0
L8:
        pop         edi
        pop         ebx
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_aullrem()
{
    /* *INDENT-OFF* */
    __asm {
        push        ebx
        mov         eax,dword ptr [esp+14h]
        or          eax,eax
        jne         L1
        mov         ecx,dword ptr [esp+10h]
        mov         eax,dword ptr [esp+0Ch]
        xor         edx,edx
        div         ecx
        mov         eax,dword ptr [esp+8]
        div         ecx
        mov         eax,edx
        xor         edx,edx
        jmp         L2
L1:
        mov         ecx,eax
        mov         ebx,dword ptr [esp+10h]
        mov         edx,dword ptr [esp+0Ch]
        mov         eax,dword ptr [esp+8]
L3:
        shr         ecx,1
        rcr         ebx,1
        shr         edx,1
        rcr         eax,1
        or          ecx,ecx
        jne         L3
        div         ebx
        mov         ecx,eax
        mul         dword ptr [esp+14h]
        xchg        eax,ecx
        mul         dword ptr [esp+10h]
        add         edx,ecx
        jb          L4
        cmp         edx,dword ptr [esp+0Ch]
        ja          L4
        jb          L5
        cmp         eax,dword ptr [esp+8]
        jbe         L5
L4:
        sub         eax,dword ptr [esp+10h]
        sbb         edx,dword ptr [esp+14h]
L5:
        sub         eax,dword ptr [esp+8]
        sbb         edx,dword ptr [esp+0Ch]
        neg         edx
        neg         eax
        sbb         edx,0
L2:
        pop         ebx
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_alldvrm()
{
    /* *INDENT-OFF* */
    __asm {
        push        edi
        push        esi
        push        ebp
        xor         edi,edi
        xor         ebp,ebp
        mov         eax,dword ptr [esp+14h]
        or          eax,eax
        jge         L1
        inc         edi
        inc         ebp
        mov         edx,dword ptr [esp+10h]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+14h],eax
        mov         dword ptr [esp+10h],edx
L1:
        mov         eax,dword ptr [esp+1Ch]
        or          eax,eax
        jge         L2
        inc         edi
        mov         edx,dword ptr [esp+18h]
        neg         eax
        neg         edx
        sbb         eax,0
        mov         dword ptr [esp+1Ch],eax
        mov         dword ptr [esp+18h],edx
L2:
        or          eax,eax
        jne         L3
        mov         ecx,dword ptr [esp+18h]
        mov         eax,dword ptr [esp+14h]
        xor         edx,edx
        div         ecx
        mov         ebx,eax
        mov         eax,dword ptr [esp+10h]
        div         ecx
        mov         esi,eax
        mov         eax,ebx
        mul         dword ptr [esp+18h]
        mov         ecx,eax
        mov         eax,esi
        mul         dword ptr [esp+18h]
        add         edx,ecx
        jmp         L4
L3:
        mov         ebx,eax
        mov         ecx,dword ptr [esp+18h]
        mov         edx,dword ptr [esp+14h]
        mov         eax,dword ptr [esp+10h]
L5:
        shr         ebx,1
        rcr         ecx,1
        shr         edx,1
        rcr         eax,1
        or          ebx,ebx
        jne         L5
        div         ecx
        mov         esi,eax
        mul         dword ptr [esp+1Ch]
        mov         ecx,eax
        mov         eax,dword ptr [esp+18h]
        mul         esi
        add         edx,ecx
        jb          L6
        cmp         edx,dword ptr [esp+14h]
        ja          L6
        jb          L7
        cmp         eax,dword ptr [esp+10h]
        jbe         L7
L6:
        dec         esi
        sub         eax,dword ptr [esp+18h]
        sbb         edx,dword ptr [esp+1Ch]
L7:
        xor         ebx,ebx
L4:
        sub         eax,dword ptr [esp+10h]
        sbb         edx,dword ptr [esp+14h]
        dec         ebp
        jns         L9
        neg         edx
        neg         eax
        sbb         edx,0
L9:
        mov         ecx,edx
        mov         edx,ebx
        mov         ebx,ecx
        mov         ecx,eax
        mov         eax,esi
        dec         edi
        jne         L8
        neg         edx
        neg         eax
        sbb         edx,0
L8:
        pop         ebp
        pop         esi
        pop         edi
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_aulldvrm()
{
    /* *INDENT-OFF* */
    __asm {
        push        esi
        mov         eax,dword ptr [esp+14h]
        or          eax,eax
        jne         L1
        mov         ecx,dword ptr [esp+10h]
        mov         eax,dword ptr [esp+0Ch]
        xor         edx,edx
        div         ecx
        mov         ebx,eax
        mov         eax,dword ptr [esp+8]
        div         ecx
        mov         esi,eax
        mov         eax,ebx
        mul         dword ptr [esp+10h]
        mov         ecx,eax
        mov         eax,esi
        mul         dword ptr [esp+10h]
        add         edx,ecx
        jmp         L2
L1:
        mov         ecx,eax
        mov         ebx,dword ptr [esp+10h]
        mov         edx,dword ptr [esp+0Ch]
        mov         eax,dword ptr [esp+8]
L3:
        shr         ecx,1
        rcr         ebx,1
        shr         edx,1
        rcr         eax,1
        or          ecx,ecx
        jne         L3
        div         ebx
        mov         esi,eax
        mul         dword ptr [esp+14h]
        mov         ecx,eax
        mov         eax,dword ptr [esp+10h]
        mul         esi
        add         edx,ecx
        jb          L4
        cmp         edx,dword ptr [esp+0Ch]
        ja          L4
        jb          L5
        cmp         eax,dword ptr [esp+8]
        jbe         L5
L4:
        dec         esi
        sub         eax,dword ptr [esp+10h]
        sbb         edx,dword ptr [esp+14h]
L5:
        xor         ebx,ebx
L2:
        sub         eax,dword ptr [esp+8]
        sbb         edx,dword ptr [esp+0Ch]
        neg         edx
        neg         eax
        sbb         edx,0
        mov         ecx,edx
        mov         edx,ebx
        mov         ebx,ecx
        mov         ecx,eax
        mov         eax,esi
        pop         esi
        ret         10h
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_allshl()
{
    /* *INDENT-OFF* */
    __asm {
        cmp         cl,40h
        jae         RETZERO
        cmp         cl,20h
        jae         MORE32
        shld        edx,eax,cl
        shl         eax,cl
        ret
MORE32:
        mov         edx,eax
        xor         eax,eax
        and         cl,1Fh
        shl         edx,cl
        ret
RETZERO:
        xor         eax,eax
        xor         edx,edx
        ret
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_allshr()
{
    /* *INDENT-OFF* */
    __asm {
        cmp         cl,40h
        jae         RETZERO
        cmp         cl,20h
        jae         MORE32
        shrd        eax,edx,cl
        sar         edx,cl
        ret
MORE32:
        mov         eax,edx
        xor         edx,edx
        and         cl,1Fh
        sar         eax,cl
        ret
RETZERO:
        xor         eax,eax
        xor         edx,edx
        ret
    }
    /* *INDENT-ON* */
}

void
__declspec(naked)
_aullshr()
{
    /* *INDENT-OFF* */
    __asm {
        cmp         cl,40h
        jae         RETZERO
        cmp         cl,20h
        jae         MORE32
        shrd        eax,edx,cl
        shr         edx,cl
        ret
MORE32:
        mov         eax,edx
        xor         edx,edx
        and         cl,1Fh
        shr         eax,cl
        ret
RETZERO:
        xor         eax,eax
        xor         edx,edx
        ret
    }
    /* *INDENT-ON* */
}

#endif /* _WIN64 */

#endif /* MSC_VER */

#endif /* !HAVE_LIBC */

/* vi: set ts=4 sw=4 expandtab: */