Descent3/lnxmvelib/asmstub.c

#include <unistd.h>
#include <sys/mman.h>

/* These are our global variables for passing values - AH */
/* For _asm_sndDecompM16 */
unsigned short *sndDecompM16_dst;
unsigned char *sndDecompM16_src;
unsigned int sndDecompM16_len;
unsigned int sndDecompM16_prev;
unsigned int sndDecompM16_return;
/* For _asm_sndDecompM16 */
unsigned short *sndDecompS16_dst;
unsigned char *sndDecompS16_src;
unsigned int sndDecompS16_len;
unsigned int sndDecompS16_prev;
unsigned int sndDecompS16_return;
/* For _asm_nfHPkDecomp */
unsigned char *nfHPkDecomp_ops;
unsigned char *nfHPkDecomp_comp;
unsigned int nfHPkDecomp_x;
unsigned int nfHPkDecomp_y;
unsigned int nfHPkDecomp_w;
unsigned int nfHPkDecomp_h;

#ifdef __cplusplus /* Avoid C++ name mangling - AH */
extern "C" {
#endif
    void _asm_sndDecompM16(void);
    void _asm_sndDecompS16(void);
    void _asm_nfPkConfig(void);
    void _asm_nfHPkDecomp(void);
    void _asm_selfModify(void);
#ifdef __cplusplus
}
#endif

#define MAX_MEM_UNLOCK_POINTS 20
int global_unlock_memory_pointers[MAX_MEM_UNLOCK_POINTS]; // _asm_selfModify() sets these

int allow_self_modification(void)
{
    int i;
    unsigned int page_start;

    for (i = 0; i < MAX_MEM_UNLOCK_POINTS; i++)
        global_unlock_memory_pointers[i] = 0;

    _asm_selfModify();

    for (i = 0; i < MAX_MEM_UNLOCK_POINTS; i++)
        if (global_unlock_memory_pointers[i] != 0)
        {
            page_start = global_unlock_memory_pointers[i] - (global_unlock_memory_pointers[i] % getpagesize());
            mprotect((void *)page_start, getpagesize() * 2, PROT_READ | PROT_WRITE | PROT_EXEC);
            //fprintf(stderr, "Unlocked memory location %x for location %x.\n",page_start, global_unlock_memory_pointers[i]);
        }
    return(1);
}	
unsigned sndDecompM16(unsigned short *dst, unsigned char *src,unsigned len, unsigned prev)
{
    sndDecompM16_dst = dst;
    sndDecompM16_src = src;
    sndDecompM16_len = len;
    sndDecompM16_prev = prev;
    __asm__ (" call _asm_sndDecompM16"
    	: : : "%esi", "%edi", "%ebx", "cc", "memory");
    return(sndDecompM16_return);
}

unsigned sndDecompS16(unsigned short *dst, unsigned char *src, unsigned len, unsigned prev)
{
    sndDecompS16_dst = dst;
    sndDecompS16_src = src;
    sndDecompS16_len = len;
    sndDecompS16_prev = prev;
    __asm__ ("call _asm_sndDecompS16"
    	: : : "%esi", "%edi", "%ebx", "cc", "memory");
    return(sndDecompS16_return);
}

void nfPkConfig(void)
{
    __asm__ ("call _asm_nfPkConfig"
    	: : : "%esi", "%edi", "%ebx", "cc", "memory");
    return;
}

void nfHPkDecomp(unsigned char *ops,unsigned char *comp, unsigned int x, unsigned int y, unsigned int w,unsigned int h)
{
    nfHPkDecomp_ops = ops;
    nfHPkDecomp_comp = comp;
    nfHPkDecomp_x = x;
    nfHPkDecomp_y = y;
    nfHPkDecomp_w = w;
    nfHPkDecomp_h = h;
    __asm__ ("call _asm_nfHPkDecomp"
    	: : : "%esi", "%edi", "%ebx", "cc", "memory");	
    return;
}

/***********************************************************/
/* Non-Implemented functions (from inside mveasm.cpp - AH) */
/***********************************************************/

void nfHiColorDecomp(unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h);
void nfHiColorDecompChg(unsigned short *chgs,unsigned short *parms,unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h);
void nfDecomp(unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h);
void nfDecompChg(unsigned short *chgs,unsigned short *parms,unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h);
void nfPkPal(void);
void nfPkDecomp(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h);
void nfPkDecompH(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h);
void nfPkDecompD(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h);
void mve_ShowFrameField(unsigned char *buf, unsigned bufw, unsigned bufh,unsigned sx, unsigned sy, unsigned w, unsigned h,unsigned dstx, unsigned dsty, unsigned field);
void mve_ShowFrameFieldHi(unsigned char *buf, unsigned bufw, unsigned bufh,unsigned sx, unsigned sy, unsigned w, unsigned h,unsigned dstx, unsigned dsty, unsigned field);
void mve_sfShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned short *chgs,unsigned dstx, unsigned dsty);
void mve_sfHiColorShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned short *chgs,unsigned dstx, unsigned dsty);
void mve_sfPkShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned char *ops,unsigned dstx, unsigned dsty);
void mve_sfPkHiColorShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned char *ops,unsigned dstx, unsigned dsty);

void MVE_SetPalette(unsigned char *p, unsigned start, unsigned count);
void palLoadCompPalette(unsigned char *buf);
void gfxMode(unsigned mode);
void gfxLoadCrtc(unsigned char *crtc,unsigned char chain4,unsigned char res);
void gfxGetCrtc(unsigned char *crtc);
void gfxVres(unsigned char misc,unsigned char *crtc);
void MVE_gfxWaitRetrace(int state);
void MVE_gfxSetSplit(unsigned line);

// rcg07272000
// need this on non-Intel platforms. Intel uses int $3.
#if (defined __i386__)
#define int3 __asm__ __volatile__ ( "int $3" );
#else
#define int3 raise(SIGTRAP);
#endif

void nfHiColorDecomp(unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h)
{
	int3
}
void nfHiColorDecompChg(unsigned short *chgs,unsigned short *parms,unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h)
{
	int3
}
void nfDecomp(unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h)
{
	int3
}
void nfDecompChg(unsigned short *chgs,unsigned short *parms,unsigned char *comp,unsigned x, unsigned y, unsigned w, unsigned h)
{
	int3
}
void nfPkPal(void)
{
	int3
}
void nfPkDecomp(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h)
{
	int3
}
void nfPkDecompH(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h)
{
	int3
}
void nfPkDecompD(unsigned char *ops,unsigned char *comp,unsigned x,unsigned y,unsigned w,unsigned h)
{
	int3
}
void mve_ShowFrameField(unsigned char *buf, unsigned bufw, unsigned bufh,unsigned sx, unsigned sy, unsigned w, unsigned h,unsigned dstx, unsigned dsty, unsigned field)
{
	int3
}
void mve_ShowFrameFieldHi(unsigned char *buf, unsigned bufw, unsigned bufh,unsigned sx, unsigned sy, unsigned w, unsigned h,unsigned dstx, unsigned dsty, unsigned field)
{
	int3
}
void mve_sfShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned short *chgs,unsigned dstx, unsigned dsty)
{
	int3
}
void mve_sfHiColorShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned short *chgs,unsigned dstx, unsigned dsty)
{
	int3
}
void mve_sfPkShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned char *ops,unsigned dstx, unsigned dsty)
{
	int3
}
void mve_sfPkHiColorShowFrameChg(bool prvbuf,unsigned x, unsigned y, unsigned w, unsigned h,unsigned char *ops,unsigned dstx, unsigned dsty)
{
	int3
}
/* Avoid name mangling issues by moving this into mvelibl.cpp - AH
void MVE_SetPalette(unsigned char *p, unsigned start, unsigned count)
{
	int3
} */
void palLoadCompPalette(unsigned char *buf)
{
	int3
}
void gfxMode(unsigned mode)
{
	int3
}
void gfxLoadCrtc(unsigned char *crtc,unsigned char chain4,unsigned char res)
{
	int3
}
void gfxGetCrtc(unsigned char *crtc)
{
	int3
}
void gfxVres(unsigned char misc,unsigned char *crtc)
{
	int3
}
void MVE_gfxWaitRetrace(int state)
{
	int3
}
void MVE_gfxSetSplit(unsigned line)
{
	int3
}