swapd0 Posted January 9, 2019 Share Posted January 9, 2019 I've this code, why _gpu_code_start it's exported but_gpu_sprite it's not exported? How can I export a label that will be located at GPU RAM? _gpu_code_start:: .gpu .org G_RAM movei #gpu_sprite,r0 ... .long _gpu_sprite:: dc.l 0 Quote Link to comment Share on other sites More sharing options...
ggn Posted January 10, 2019 Share Posted January 10, 2019 (edited) Modified the code a bit to be more self contained and assemble: BASE EQU $F00000 ; TOM Internal Register Base G_RAM EQU BASE + $3000 ; GPU Internal RAM _gpu_code_start:: .gpu .org G_RAM movei #_gpu_sprite,r0 .long _gpu_sprite:: dc.l 0 Assembled with rmac 1.13.5 using "rmac -fe -l*swapd0.lst swapd0.s". I assume you want elf .o objects. The listing for this looks like: 1 =00F00000 BASE EQU $F00000 ; TOM Internal Register Base 2 =00F03000 G_RAM EQU BASE + $3000 ; GPU Internal RAM 3 4 _gpu_code_start:: 5 .gpu 6 .org G_RAM 7 8 9 00000000 9800xxxxxxxx movei #_gpu_sprite,r0 10 11 12 00000006 0000 .long 13 14 00000008 00000000 _gpu_sprite:: dc.l 0 BASE 0000000000F00000 a G_RAM 0000000000F03000 a _gpu_code_start 0000000000000000 tg _gpu_sprite 0000000000F03008 ag Looks like the symbols are tagged as global here. Let's look at the .o file itself: ELF Header Class: ELF32 Encoding: Big endian ELFVersion: Current Type: Relocatable file Machine: Motorola m68k family Version: Current Entry: 0x0 Flags: 0x0 Section Headers: [ Nr ] Type Addr Size ES Flg Lk Inf Al Name [ 0] NULL 00000000 00000000 00 00 000 00 [ 1] PROGBITS 00000000 0000000c 00 AX 00 000 04 .text [ 2] STRTAB 00000000 00000021 00 00 000 01 .shstrtab [ 3] SYMTAB 00000000 00000060 10 04 004 04 .symtab [ 4] STRTAB 00000000 00000028 00 00 000 01 .strtab Key to Flags: W (write), A (alloc), X (execute) Symbol table (.symtab) [ Nr ] Value Size Type Bind Sect Name [ 0] 00000000 00000000 NOTYPE LOCAL 0 [ 1] 00000000 00000000 SECTION LOCAL 1 [ 2] 00f00000 00000000 NOTYPE LOCAL 65521 BASE [ 3] 00f03000 00000000 NOTYPE LOCAL 65521 G_RAM [ 4] 00000000 00000000 NOTYPE GLOBAL 1 _gpu_code_start [ 5] 00f03008 00000000 NOTYPE GLOBAL 0 _gpu_sprite Section Data: .text [00000000] 98 00 30 08 00 f0 00 00 00 00 00 00 .shstrtab [00000000] 00 2e 73 68 73 74 72 74 61 62 00 2e 73 79 6d 74 [00000010] 61 62 00 2e 73 74 72 74 61 62 00 2e 74 65 78 74 [00000020] 00 .symtab [00000000] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [00000010] 00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 01 [00000020] 00 00 00 01 00 f0 00 00 00 00 00 00 00 00 ff f1 [00000030] 00 00 00 06 00 f0 30 00 00 00 00 00 00 00 ff f1 .strtab [00000000] 00 42 41 53 45 00 47 5f 52 41 4d 00 5f 67 70 75 [00000010] 5f 63 6f 64 65 5f 73 74 61 72 74 00 5f 67 70 75 [00000020] 5f 73 70 72 69 74 65 00 Generated by ELFIO (C++ library for ELF file processing) http://elfio.sourceforge.net/ Again the symbols look global. So as far as I can see it's not rmac's fault. You'll have to tell us some more info like the version of rmac you used, the command line you used, and whether your compiler/linker requires extra undercores (or no underscores at all). Maybe your symbols need to be defined using a double underscore (for example __gpu_sprite). Edited January 10, 2019 by ggn 1 Quote Link to comment Share on other sites More sharing options...
swapd0 Posted January 10, 2019 Author Share Posted January 10, 2019 I'm using rmac 1.12.4 List output, looks ok. swapd0$ cat test.lst test.s Page 1 11:07:22 am 10-Jan-2019 RMAC 1.12.04 (Linux/OSX) 1 =00F00000 BASE EQU $F00000 ; TOM Internal Register Base 2 =00F03000 G_RAM EQU BASE + $3000 ; GPU Internal RAM 3 4 _gpu_code_start:: 5 .gpu 6 .org G_RAM 7 8 00000000 9800xxxxxxxx movei #_gpu_sprite,r0 9 10 00000006 0000 .long 11 12 00000008 00000000 _gpu_sprite:: dc.l 0 test.s Page 2 11:07:22 am 10-Jan-2019 RMAC 1.12.04 (Linux/OSX) Symbol Table BASE 0000000000F00000 a G_RAM 0000000000F03000 a _gpu_code_start 0000000000000000 tg _gpu_sprite 0000000000F03008 ag nm output, _gpu_sprite it's wrong, it should be $f03008 0$ nm test.o 00f00000 a BASE 00f03000 a G_RAM 00000000 T _gpu_code_start U _gpu_sprite I got a linker error telling me that _gpu_sprite it's not defined, but I've no problem with _gpu_code_start, it's weird. Quote Link to comment Share on other sites More sharing options...
ggn Posted January 10, 2019 Share Posted January 10, 2019 nm output, _gpu_sprite it's wrong, it should be $f03008 0$ nm test.o 00f00000 a BASE 00f03000 a G_RAM 00000000 T _gpu_code_start U _gpu_sprite I got a linker error telling me that _gpu_sprite it's not defined, but I've no problem with _gpu_code_start, it's weird. Here I got nm swapd0.o 00000000 T _gpu_code_start U _gpu_sprite 00f00000 a BASE 00f03000 a G_RAMSo, probably update your rmac? Quote Link to comment Share on other sites More sharing options...
swapd0 Posted January 10, 2019 Author Share Posted January 10, 2019 With this asm code. _label1:: _gpu_code_start:: .gpu _label2:: .org G_RAM _label3:: extern char *label1; extern char *label2; extern char *label3; int main(int argc, const char * argv[]) { *label1 = 0; *label2 = 0; *label3 = 0; } I got a linker error with label3. XD Quote Link to comment Share on other sites More sharing options...
swapd0 Posted January 10, 2019 Author Share Posted January 10, 2019 Here I got nm swapd0.o 00000000 T _gpu_code_start U _gpu_sprite 00f00000 a BASE 00f03000 a G_RAMSo, probably update your rmac? Yeah, updating in progress... Quote Link to comment Share on other sites More sharing options...
swapd0 Posted January 11, 2019 Author Share Posted January 11, 2019 Updated and it doesn't work, the problem it's that the label it's marked as undefined. To share data between GPU & 68000 I had been using a crap solution that it's to use some low memory address to write some data and the GPU reads from there, for example 0x4000 - 4 stores a pointer to the raster table at Classic Kong. I've been looking at the rmac code, and I've fixed the export to elf with absolute addressing, I've tested with Classic Kong and It works, now I'm using a label at GPU address as the raster pointer. Here it's the fix: file: object.c function: uint8_t * AddELFSymEntry(uint8_t * buf, SYM * sym, int globflag) lines: around 233 old code if (w1 & TEXT) st_shndx = elfHdrNum[ES_TEXT]; else if (w1 & DATA) st_shndx = elfHdrNum[ES_DATA]; else if (w1 & BSS) st_shndx = elfHdrNum[ES_BSS]; else if (globflag) st_shndx = 0; // Global, not absolute new code if (w1 & TEXT) st_shndx = elfHdrNum[ES_TEXT]; else if (w1 & DATA) st_shndx = elfHdrNum[ES_DATA]; else if (w1 & BSS) st_shndx = elfHdrNum[ES_BSS]; else if (globflag) { // not absolute code or it's an extern reference (DEFINED missing) if (!orgactive || (w1 & DEFINED) == 0) st_shndx = 0; // Global, not absolute } Quote Link to comment Share on other sites More sharing options...
Zerosquare Posted January 11, 2019 Share Posted January 11, 2019 To share data between GPU & 68000 I had been using a crap solution that it's to use some low memory address to write some data and the GPU reads from there, for example 0x4000 - 4 stores a pointer to the raster table at Classic Kong.If you're using shared memory for communication, it's better to use GPU memory, since the GPU can access it without needing the main bus. 3 Quote Link to comment Share on other sites More sharing options...
swapd0 Posted January 11, 2019 Author Share Posted January 11, 2019 Yes, I'm using that now, I was using main ram because I couldn't access labels defined into GPU ram, and I didn't wanted to use a fixed location into GPU ram. 1 Quote Link to comment Share on other sites More sharing options...
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