mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-04 14:57:45 -04:00
Add support for Master System cheats.
notaz: drop wrong code (PicoWrite8_z80 are 68k functions, not for sms)
This commit is contained in:
iLag
notaz
parent
8655fd0462
commit
ed4a2193f7
2 changed files with 278 additions and 107 deletions
384
pico/patch.c
384
pico/patch.c
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@ -29,12 +29,13 @@ struct patch
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{
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unsigned int addr;
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unsigned short data;
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unsigned char comp;
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};
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struct patch_inst *PicoPatches = NULL;
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int PicoPatchCount = 0;
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static char genie_chars[] = "AaBbCcDdEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz0O1I2233445566778899";
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static char genie_chars_md[] = "AaBbCcDdEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz0O1I2233445566778899";
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/* genie_decode
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* This function converts a Game Genie code to an address:data pair.
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@ -48,20 +49,23 @@ static char genie_chars[] = "AaBbCcDdEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz0O1I223
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* by result. If an error results, both the address and data will be set to -1.
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*/
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static void genie_decode(const char* code, struct patch* result)
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static void genie_decode_md(const char* code, struct patch* result)
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{
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int i = 0, n;
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char* x;
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for(; i < 8; ++i)
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for(; i < 9; ++i)
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{
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/* Skip i=4; it's going to be the separating hyphen */
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if (i==4) continue;
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/* If strchr returns NULL, we were given a bad character */
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if(!(x = strchr(genie_chars, code[i])))
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if(!(x = strchr(genie_chars_md, code[i])))
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{
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result->addr = -1; result->data = -1;
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return;
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}
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n = (x - genie_chars) >> 1;
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n = (x - genie_chars_md) >> 1;
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/* Now, based on which character this is, fit it into the result */
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switch(i)
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{
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@ -82,21 +86,21 @@ static void genie_decode(const char* code, struct patch* result)
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/* BCDE ____ ____ ___A ____ ____ : ____ ____ ____ ____ */
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result->addr |= (n & 0xF) << 20 | (n >> 4) << 8;
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break;
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case 4:
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case 5:
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/* ____ ABCD ____ ____ ____ ____ : ___E ____ ____ ____ */
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result->data |= (n & 1) << 12;
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result->addr |= (n >> 1) << 16;
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break;
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case 5:
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case 6:
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/* ____ ____ ____ ____ ____ ____ : E___ ABCD ____ ____ */
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result->data |= (n & 1) << 15 | (n >> 1) << 8;
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break;
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case 6:
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case 7:
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/* ____ ____ ____ ____ CDE_ ____ : _AB_ ____ ____ ____ */
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result->data |= (n >> 3) << 13;
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result->addr |= (n & 7) << 5;
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break;
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case 7:
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case 8:
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/* ____ ____ ____ ____ ___A BCDE : ____ ____ ____ ____ */
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result->addr |= n;
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break;
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@ -114,30 +118,165 @@ static void genie_decode(const char* code, struct patch* result)
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static char hex_chars[] = "00112233445566778899AaBbCcDdEeFf";
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static void hex_decode(const char *code, struct patch *result)
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static void hex_decode_md(const char *code, struct patch *result)
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{
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char *x;
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int i;
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/* 6 digits for address */
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for(i = 0; i < 6; ++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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}
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/* 4 digits for data */
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for(i = 6; i < 10; ++i)
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for(i = 7; i < 11; ++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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if (i==8) break;
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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}
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}
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void genie_decode_ms(const char *code, struct patch *result)
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{
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char *x;
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int i;
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/* 2 digits for data */
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for(i=0;i<2;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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}
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/* 4 digits for address */
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for(i=2;i<7;++i)
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{
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/* 4th character is hyphen and can be skipped*/
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if (i==3) continue;
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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}
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/* Correct the address */
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result->addr = ((result->addr >> 4) | (result->addr << 12 & 0xF000)) ^ 0xF000;
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/* Optional: 3 digits for comp */
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if (code[8]){
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for(i=8;i<11;++i)
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{
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if (i==9) continue; /* 2nd character is ignored */
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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result->comp = (result->comp << 4) | ((x - hex_chars) >> 1);
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}
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/* Correct the comp */
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result->comp = ((result->comp >> 2) | ((result->comp << 6) & 0xC0)) ^ 0xBA;
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}
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}
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void ar_decode_ms(const char *code, struct patch *result){
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char *x;
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int i;
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/* 2 digits of padding*/
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/* 4 digits for address */
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for(i=2;i<7;++i)
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{
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/* 5th character is hyphen and can be skipped*/
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if (i==4) continue;
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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}
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/* 2 digits for data */
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for(i=7;i<9;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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}
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}
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void fusion_ram_decode(const char *code, struct patch *result){
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char *x;
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int i;
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/* 4 digits for address */
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for(i=0;i<4;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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}
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/* Skip the ':' */
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/* 2 digits for data */
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for(i=5;i<7;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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}
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}
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void fusion_rom_decode(const char *code, struct patch *result){
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char *x;
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int i;
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/* 2 digits for comp */
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for(i=0;i<2;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->comp = (result->comp << 4) | ((x - hex_chars) >> 1);
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}
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/* 4 digits for address */
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for(i=2;i<6;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->addr = (result->addr << 4) | ((x - hex_chars) >> 1);
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}
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/* 2 digits for data */
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for(i=7;i<9;++i)
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{
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if(!(x = strchr(hex_chars, code[i])))
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{
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result->addr = result->data = -1;
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return;
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}
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result->data = (result->data << 4) | ((x - hex_chars) >> 1);
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}
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}
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/* THIS is the function you call from the MegaDrive or whatever. This figures
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@ -145,75 +284,76 @@ static void hex_decode(const char *code, struct patch *result)
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* decoder. */
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void decode(const char* code, struct patch* result)
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{
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int len = strlen(code), i, j;
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char code_to_pass[16], *x;
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const char *ad, *da;
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int adl, dal;
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int len = strlen(code);
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/* Initialize the result */
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result->addr = result->data = 0;
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result->addr = result->data = result->comp = 0;
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/* Just assume 8 char long string to be Game Genie code */
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if (len == 8)
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if(!(PicoAHW & PAHW_SMS))
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{
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genie_decode(code, result);
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return;
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}
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//If Genesis
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/* If it's 9 chars long and the 5th is a hyphen, we have a Game Genie
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* code. */
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//Game Genie
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if(len == 9 && code[4] == '-')
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{
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/* Remove the hyphen and pass to genie_decode */
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code_to_pass[0] = code[0];
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code_to_pass[1] = code[1];
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code_to_pass[2] = code[2];
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code_to_pass[3] = code[3];
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code_to_pass[4] = code[5];
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code_to_pass[5] = code[6];
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code_to_pass[6] = code[7];
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code_to_pass[7] = code[8];
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code_to_pass[8] = '\0';
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genie_decode(code_to_pass, result);
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genie_decode_md(code, result);
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return;
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}
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/* Otherwise, we assume it's a hex code.
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* Find the colon so we know where address ends and data starts. If there's
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* no colon, then we haven't a code at all! */
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if(!(x = strchr(code, ':'))) goto bad_code;
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ad = code; da = x + 1; adl = x - code; dal = len - adl - 1;
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//Master
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else if(len >=9 && code[6] == ':')
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{
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hex_decode_md(code, result);
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}
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/* If a section is empty or too long, toss it */
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if(adl == 0 || adl > 6 || dal == 0 || dal > 4) goto bad_code;
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else
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{
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goto bad_code;
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}
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} else {
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//If Master System
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/* Pad the address with zeros, then fill it with the value */
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for(i = 0; i < (6 - adl); ++i) code_to_pass[i] = '0';
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for(j = 0; i < 6; ++i, ++j) code_to_pass[i] = ad[j];
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//Genie
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if(len == 11 && code[3] == '-' && code[7] == '-')
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{
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genie_decode_ms(code, result);
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}
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/* Do the same for data */
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for(i = 6; i < (10 - dal); ++i) code_to_pass[i] = '0';
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for(j = 0; i < 10; ++i, ++j) code_to_pass[i] = da[j];
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//AR
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else if(len == 9 && code[4] == '-')
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{
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ar_decode_ms(code, result);
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}
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code_to_pass[10] = '\0';
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//Fusion RAM
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else if(len == 7 && code[4] == ':')
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{
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fusion_ram_decode(code, result);
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}
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//Fusion ROM
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else if(len == 9 && code[6] == ':')
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{
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fusion_rom_decode(code, result);
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}
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else
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{
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goto bad_code;
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}
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//Convert RAM address space to Genesis location.
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if (result->addr>=0xC000)
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result->addr= 0xFF0000 | (0x1FFF & result->addr);
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}
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/* Decode and goodbye */
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hex_decode(code_to_pass, result);
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return;
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bad_code:
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/* AGH! Invalid code! */
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bad_code:
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result->data = result->addr = -1;
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return;
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}
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unsigned int PicoRead16(unsigned int a);
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void PicoWrite16(unsigned int a, unsigned short d);
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void PicoPatchUnload(void)
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{
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if (PicoPatches != NULL)
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@ -293,54 +433,84 @@ int PicoPatchLoad(const char *fname)
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/* to be called when the Rom is loaded and byteswapped */
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void PicoPatchPrepare(void)
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{
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int i;
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int i;
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int addr;
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for (i = 0; i < PicoPatchCount; i++)
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{
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PicoPatches[i].addr &= ~1;
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if (PicoPatches[i].addr < Pico.romsize)
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PicoPatches[i].data_old = *(unsigned short *)(Pico.rom + PicoPatches[i].addr);
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else
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PicoPatches[i].data_old = (unsigned short) m68k_read16(PicoPatches[i].addr);
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if (strstr(PicoPatches[i].name, "AUTO"))
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PicoPatches[i].active = 1;
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}
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for (i = 0; i < PicoPatchCount; i++)
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{
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addr=PicoPatches[i].addr;
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addr &= ~1;
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if (addr < Pico.romsize)
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PicoPatches[i].data_old = *(unsigned short *)(Pico.rom + addr);
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else
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{
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if(!(PicoAHW & PAHW_SMS))
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PicoPatches[i].data_old = (unsigned short) m68k_read16(addr);
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else
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; // wrong: PicoPatches[i].data_old = (unsigned char) PicoRead8_z80(addr);
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}
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if (strstr(PicoPatches[i].name, "AUTO"))
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PicoPatches[i].active = 1;
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}
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}
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void PicoPatchApply(void)
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{
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int i, u;
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unsigned int addr;
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int i, u;
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unsigned int addr;
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for (i = 0; i < PicoPatchCount; i++)
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for (i = 0; i < PicoPatchCount; i++)
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{
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addr = PicoPatches[i].addr;
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if (addr < Pico.romsize)
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{
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if (PicoPatches[i].active)
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{
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if (!(PicoAHW & PAHW_SMS))
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*(unsigned short *)(Pico.rom + addr) = PicoPatches[i].data;
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else if (!PicoPatches[i].comp || PicoPatches[i].comp == *(char *)(Pico.rom + addr))
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*(char *)(Pico.rom + addr) = (char) PicoPatches[i].data;
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}
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else
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{
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// if current addr is not patched by older patch, write back original val
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for (u = 0; u < i; u++)
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if (PicoPatches[u].addr == addr) break;
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if (u == i)
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{
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addr = PicoPatches[i].addr;
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if (addr < Pico.romsize)
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{
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if (PicoPatches[i].active)
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*(unsigned short *)(Pico.rom + addr) = PicoPatches[i].data;
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else {
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// if current addr is not patched by older patch, write back original val
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for (u = 0; u < i; u++)
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if (PicoPatches[u].addr == addr) break;
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if (u == i)
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*(unsigned short *)(Pico.rom + addr) = PicoPatches[i].data_old;
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}
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// fprintf(stderr, "patched %i: %06x:%04x\n", PicoPatches[i].active, addr,
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// *(unsigned short *)(Pico.rom + addr));
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}
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else
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{
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if (PicoPatches[i].active)
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m68k_write16(PicoPatches[i].addr,PicoPatches[i].data);
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else {
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// if current addr is not patched by older patch, write back original val
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for (u = 0; u < i; u++)
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if (PicoPatches[u].addr == addr) break;
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if (u == i)
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||||
m68k_write16(PicoPatches[i].addr,PicoPatches[i].data_old);
|
||||
}
|
||||
}
|
||||
if (!(PicoAHW & PAHW_SMS))
|
||||
*(unsigned short *)(Pico.rom + addr) = PicoPatches[i].data_old;
|
||||
else
|
||||
*(char *)(Pico.rom + addr) = (char) PicoPatches[i].data_old;
|
||||
}
|
||||
}
|
||||
// fprintf(stderr, "patched %i: %06x:%04x\n", PicoPatches[i].active, addr,
|
||||
// *(unsigned short *)(Pico.rom + addr));
|
||||
}
|
||||
else
|
||||
{
|
||||
if (PicoPatches[i].active)
|
||||
{
|
||||
if (!(PicoAHW & PAHW_SMS))
|
||||
m68k_write16(addr,PicoPatches[i].data);
|
||||
else
|
||||
;// wrong: PicoWrite8_z80(addr,PicoPatches[i].data);
|
||||
}
|
||||
else
|
||||
{
|
||||
// if current addr is not patched by older patch, write back original val
|
||||
for (u = 0; u < i; u++)
|
||||
if (PicoPatches[u].addr == addr) break;
|
||||
if (u == i)
|
||||
{
|
||||
if (!(PicoAHW & PAHW_SMS))
|
||||
m68k_write16(PicoPatches[i].addr,PicoPatches[i].data_old);
|
||||
else
|
||||
;// wrong: PicoWrite8_z80(PicoPatches[i].addr,PicoPatches[i].data_old);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -13,6 +13,7 @@ struct patch_inst
|
|||
unsigned int addr;
|
||||
unsigned short data;
|
||||
unsigned short data_old;
|
||||
unsigned char comp;
|
||||
};
|
||||
|
||||
extern struct patch_inst *PicoPatches;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue