start new makefile, migrate to libpicofe

[picodrive.git] / cpu / Cyclone / epoc / patchtable_symb.c

#include <stdio.h>\r
#include <stdlib.h>\r
#include <string.h>\r
\r
\r
typedef struct {\r
	unsigned long _dontcare1[4];\r
	char signature[4];						// 'EPOC'\r
	unsigned long iCpu;						// 0x1000 = X86, 0x2000 = ARM, 0x4000 = M*Core\r
	unsigned long iCheckSumCode;			// sum of all 32 bit words in .text\r
	unsigned long _dontcare3[5];\r
	unsigned long iCodeSize;				// size of code, import address table, constant data and export dir |+30\r
	unsigned long _dontcare4[12];\r
	unsigned long iCodeOffset;				// file offset to code section    |+64\r
	unsigned long _dontcare5[2];\r
	unsigned long iCodeRelocOffset;			// relocations for code and const |+70\r
	unsigned long iDataRelocOffset;			// relocations for data\r
	unsigned long iPriority;		// priority of this process (EPriorityHigh=450)\r
} E32ImageHeader;\r
\r
\r
typedef struct {\r
	unsigned long iSize;				// size of this relocation section\r
	unsigned long iNumberOfRelocs;		// number of relocations in this section\r
} E32RelocSection;\r
\r
\r
typedef struct {\r
	unsigned long base;\r
	unsigned long size;\r
} reloc_page_header;\r
\r
\r
// E32Image relocation section consists of a number of pages\r
// every page has 8 byte header and a number or 16bit relocation entries\r
// entry format:\r
// 0x3000 | <12bit_reloc_offset>\r
//\r
// if we have page_header.base == 0x1000 and a reloc entry 0x3110,\r
// it means that 32bit value at offset 0x1110 of .text section\r
// is relocatable\r
\r
int main(int argc, char *argv[])\r
{\r
	FILE *f = 0;\r
	unsigned char pattern[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0x12, 0x34, 0x56 };\r
	unsigned char *buff, *p;\r
	unsigned long patt_offset; // pattern offset in .text section\r
	unsigned long size = 0, i, symbols, insert_pos, *handler;\r
	unsigned short reloc_entry;\r
	E32ImageHeader  *header;\r
	E32RelocSection *reloc_section;\r
	reloc_page_header *reloc_page;\r
\r
	if(argc != 3) {\r
		printf("usage: %s <e32_exe> <nsymbols>\n\n", argv[0]);\r
		printf("note: this was written to fix a problem caused by as v.2.9-psion-98r2 and shouldn't be used for anything else.\n", argv[0]);\r
		return 1;\r
	}\r
	\r
	f = fopen(argv[1], "rb+");\r
	if(!f) {\r
		printf("%s: couldn't open %s\n", argv[0], argv[1]);\r
		return 2;\r
	}\r
\r
	symbols = atoi(argv[2]);\r
\r
	// read the file\r
	fseek(f,0,SEEK_END); size=ftell(f); fseek(f,0,SEEK_SET);\r
	buff = (unsigned char *) malloc(size);\r
	fread(buff,1,size,f);\r
\r
	header = (E32ImageHeader *) buff;\r
\r
	if(strncmp(header->signature, "EPOC", 4) || header->iCpu != 0x2000) {\r
		printf("%s: not a E32 executable image for ARM target.\n", argv[0]);\r
		fclose(f);\r
		free(buff);\r
		return 2;\r
	}\r
\r
	// find the pattern\r
	for(i = 0; i < size-8; i++)\r
		if(memcmp(buff+i, pattern, 8) == 0) break;\r
	if(i == size-8 || i < 4) {\r
		printf("%s: failed to find the pattern.\n", argv[0]);\r
		fclose(f);\r
		free(buff);\r
		return 3;\r
	}\r
	patt_offset = i - header->iCodeOffset;\r
\r
	// find suitable reloc section\r
	reloc_section = (E32RelocSection *) (buff + header->iCodeRelocOffset);\r
	for(i = 0, p = buff+header->iCodeRelocOffset+8; i < reloc_section->iSize; ) {\r
		reloc_page = (reloc_page_header *) p;\r
		if(patt_offset - reloc_page->base >= 0 && patt_offset - reloc_page->base < 0x1000 - symbols*4) break;\r
		i += reloc_page->size;\r
		p += reloc_page->size;\r
	}\r
\r
	if(i >= reloc_section->iSize) {\r
		printf("%s: suitable reloc section not found.\n", argv[0]);\r
		fclose(f);\r
		free(buff);\r
		return 4;\r
	}\r
\r
	// now find the insert pos and update everything\r
	insert_pos = p + reloc_page->size - buff;\r
	reloc_page->size     += symbols*2;\r
	reloc_section->iSize += symbols*2;\r
	reloc_section->iNumberOfRelocs += symbols;\r
	header->iDataRelocOffset += symbols*2; // data reloc section is now also pushed a little\r
	header->iPriority = 450; // let's boost our priority :)\r
\r
	// replace the placeholders themselves\r
	handler = (unsigned long *) (buff + patt_offset + header->iCodeOffset - 4);\r
	for(i = 1; i <= symbols; i++)\r
		*(handler+i) = *handler;\r
	\r
	// recalculate checksum\r
	header->iCheckSumCode = 0;\r
	for(i = 0, p = buff+header->iCodeOffset; i < header->iCodeSize; i+=4, p+=4)\r
		header->iCheckSumCode += *(unsigned long *) p;\r
\r
	// check for possible padding\r
	if(!*(buff+insert_pos-1)) insert_pos -= 2;\r
\r
	// write all this joy\r
	fseek(f,0,SEEK_SET);\r
	fwrite(buff, 1, insert_pos, f);\r
\r
	// write new reloc entries\r
	for(i = 0; i < symbols; i++) {\r
		handler++;\r
		reloc_entry = ((unsigned char *) handler - buff - reloc_page->base - header->iCodeOffset) | 0x3000;\r
		fwrite(&reloc_entry, 1, 2, f);\r
	}\r
\r
	// write the remaining data\r
	fwrite(buff+insert_pos, 1, size-insert_pos, f);\r
\r
	// done at last!\r
	fclose(f);\r
	free(buff);\r
\r
	return 0;\r
}\r