1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
300 lines
8.8 KiB
C
300 lines
8.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#define ElfHeaderSize (64 * 1024)
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#define ElfPages (ElfHeaderSize / 4096)
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#define KERNELBASE (0xc000000000000000)
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void get4k(FILE *file, char *buf )
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{
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unsigned j;
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unsigned num = fread(buf, 1, 4096, file);
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for ( j=num; j<4096; ++j )
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buf[j] = 0;
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}
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void put4k(FILE *file, char *buf )
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{
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fwrite(buf, 1, 4096, file);
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}
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void death(const char *msg, FILE *fdesc, const char *fname)
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{
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fprintf(stderr, msg);
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fclose(fdesc);
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unlink(fname);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char inbuf[4096];
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FILE *ramDisk = NULL;
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FILE *sysmap = NULL;
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FILE *inputVmlinux = NULL;
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FILE *outputVmlinux = NULL;
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unsigned i = 0;
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unsigned long ramFileLen = 0;
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unsigned long ramLen = 0;
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unsigned long roundR = 0;
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unsigned long sysmapFileLen = 0;
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unsigned long sysmapLen = 0;
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unsigned long sysmapPages = 0;
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char* ptr_end = NULL;
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unsigned long offset_end = 0;
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unsigned long kernelLen = 0;
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unsigned long actualKernelLen = 0;
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unsigned long round = 0;
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unsigned long roundedKernelLen = 0;
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unsigned long ramStartOffs = 0;
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unsigned long ramPages = 0;
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unsigned long roundedKernelPages = 0;
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unsigned long hvReleaseData = 0;
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u_int32_t eyeCatcher = 0xc8a5d9c4;
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unsigned long naca = 0;
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unsigned long xRamDisk = 0;
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unsigned long xRamDiskSize = 0;
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long padPages = 0;
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if (argc < 2) {
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fprintf(stderr, "Name of RAM disk file missing.\n");
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exit(1);
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}
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if (argc < 3) {
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fprintf(stderr, "Name of System Map input file is missing.\n");
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exit(1);
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}
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if (argc < 4) {
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fprintf(stderr, "Name of vmlinux file missing.\n");
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exit(1);
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}
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if (argc < 5) {
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fprintf(stderr, "Name of vmlinux output file missing.\n");
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exit(1);
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}
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ramDisk = fopen(argv[1], "r");
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if ( ! ramDisk ) {
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fprintf(stderr, "RAM disk file \"%s\" failed to open.\n", argv[1]);
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exit(1);
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}
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sysmap = fopen(argv[2], "r");
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if ( ! sysmap ) {
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fprintf(stderr, "System Map file \"%s\" failed to open.\n", argv[2]);
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exit(1);
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}
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inputVmlinux = fopen(argv[3], "r");
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if ( ! inputVmlinux ) {
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fprintf(stderr, "vmlinux file \"%s\" failed to open.\n", argv[3]);
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exit(1);
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}
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outputVmlinux = fopen(argv[4], "w+");
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if ( ! outputVmlinux ) {
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fprintf(stderr, "output vmlinux file \"%s\" failed to open.\n", argv[4]);
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exit(1);
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}
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/* Input Vmlinux file */
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fseek(inputVmlinux, 0, SEEK_END);
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kernelLen = ftell(inputVmlinux);
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fseek(inputVmlinux, 0, SEEK_SET);
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printf("kernel file size = %d\n", kernelLen);
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if ( kernelLen == 0 ) {
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fprintf(stderr, "You must have a linux kernel specified as argv[3]\n");
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exit(1);
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}
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actualKernelLen = kernelLen - ElfHeaderSize;
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printf("actual kernel length (minus ELF header) = %d\n", actualKernelLen);
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round = actualKernelLen % 4096;
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roundedKernelLen = actualKernelLen;
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if ( round )
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roundedKernelLen += (4096 - round);
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printf("Vmlinux length rounded up to a 4k multiple = %ld/0x%lx \n", roundedKernelLen, roundedKernelLen);
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roundedKernelPages = roundedKernelLen / 4096;
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printf("Vmlinux pages to copy = %ld/0x%lx \n", roundedKernelPages, roundedKernelPages);
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/* Input System Map file */
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/* (needs to be processed simply to determine if we need to add pad pages due to the static variables not being included in the vmlinux) */
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fseek(sysmap, 0, SEEK_END);
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sysmapFileLen = ftell(sysmap);
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fseek(sysmap, 0, SEEK_SET);
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printf("%s file size = %ld/0x%lx \n", argv[2], sysmapFileLen, sysmapFileLen);
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sysmapLen = sysmapFileLen;
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roundR = 4096 - (sysmapLen % 4096);
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if (roundR) {
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printf("Rounding System Map file up to a multiple of 4096, adding %ld/0x%lx \n", roundR, roundR);
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sysmapLen += roundR;
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}
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printf("Rounded System Map size is %ld/0x%lx \n", sysmapLen, sysmapLen);
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/* Process the Sysmap file to determine where _end is */
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sysmapPages = sysmapLen / 4096;
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/* read the whole file line by line, expect that it doesn't fail */
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while ( fgets(inbuf, 4096, sysmap) ) ;
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/* search for _end in the last page of the system map */
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ptr_end = strstr(inbuf, " _end");
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if (!ptr_end) {
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fprintf(stderr, "Unable to find _end in the sysmap file \n");
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fprintf(stderr, "inbuf: \n");
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fprintf(stderr, "%s \n", inbuf);
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exit(1);
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}
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printf("Found _end in the last page of the sysmap - backing up 10 characters it looks like %s", ptr_end-10);
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/* convert address of _end in system map to hex offset. */
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offset_end = (unsigned int)strtol(ptr_end-10, NULL, 16);
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/* calc how many pages we need to insert between the vmlinux and the start of the ram disk */
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padPages = offset_end/4096 - roundedKernelPages;
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/* Check and see if the vmlinux is already larger than _end in System.map */
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if (padPages < 0) {
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/* vmlinux is larger than _end - adjust the offset to the start of the embedded ram disk */
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offset_end = roundedKernelLen;
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printf("vmlinux is larger than _end indicates it needs to be - offset_end = %lx \n", offset_end);
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padPages = 0;
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printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
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}
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else {
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/* _end is larger than vmlinux - use the offset to _end that we calculated from the system map */
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printf("vmlinux is smaller than _end indicates is needed - offset_end = %lx \n", offset_end);
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printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
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}
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/* Input Ram Disk file */
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// Set the offset that the ram disk will be started at.
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ramStartOffs = offset_end; /* determined from the input vmlinux file and the system map */
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printf("Ram Disk will start at offset = 0x%lx \n", ramStartOffs);
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fseek(ramDisk, 0, SEEK_END);
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ramFileLen = ftell(ramDisk);
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fseek(ramDisk, 0, SEEK_SET);
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printf("%s file size = %ld/0x%lx \n", argv[1], ramFileLen, ramFileLen);
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ramLen = ramFileLen;
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roundR = 4096 - (ramLen % 4096);
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if ( roundR ) {
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printf("Rounding RAM disk file up to a multiple of 4096, adding %ld/0x%lx \n", roundR, roundR);
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ramLen += roundR;
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}
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printf("Rounded RAM disk size is %ld/0x%lx \n", ramLen, ramLen);
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ramPages = ramLen / 4096;
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printf("RAM disk pages to copy = %ld/0x%lx\n", ramPages, ramPages);
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// Copy 64K ELF header
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for (i=0; i<(ElfPages); ++i) {
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get4k( inputVmlinux, inbuf );
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put4k( outputVmlinux, inbuf );
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}
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/* Copy the vmlinux (as full pages). */
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fseek(inputVmlinux, ElfHeaderSize, SEEK_SET);
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for ( i=0; i<roundedKernelPages; ++i ) {
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get4k( inputVmlinux, inbuf );
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put4k( outputVmlinux, inbuf );
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}
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/* Insert pad pages (if appropriate) that are needed between */
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/* | the end of the vmlinux and the ram disk. */
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for (i=0; i<padPages; ++i) {
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memset(inbuf, 0, 4096);
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put4k(outputVmlinux, inbuf);
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}
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/* Copy the ram disk (as full pages). */
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for ( i=0; i<ramPages; ++i ) {
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get4k( ramDisk, inbuf );
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put4k( outputVmlinux, inbuf );
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}
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/* Close the input files */
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fclose(ramDisk);
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fclose(inputVmlinux);
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/* And flush the written output file */
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fflush(outputVmlinux);
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/* Fixup the new vmlinux to contain the ram disk starting offset (xRamDisk) and the ram disk size (xRamDiskSize) */
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/* fseek to the hvReleaseData pointer */
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fseek(outputVmlinux, ElfHeaderSize + 0x24, SEEK_SET);
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if (fread(&hvReleaseData, 4, 1, outputVmlinux) != 1) {
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death("Could not read hvReleaseData pointer\n", outputVmlinux, argv[4]);
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}
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hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */
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printf("hvReleaseData is at %08x\n", hvReleaseData);
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/* fseek to the hvReleaseData */
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fseek(outputVmlinux, ElfHeaderSize + hvReleaseData, SEEK_SET);
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if (fread(inbuf, 0x40, 1, outputVmlinux) != 1) {
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death("Could not read hvReleaseData\n", outputVmlinux, argv[4]);
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}
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/* Check hvReleaseData sanity */
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if (memcmp(inbuf, &eyeCatcher, 4) != 0) {
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death("hvReleaseData is invalid\n", outputVmlinux, argv[4]);
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}
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/* Get the naca pointer */
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naca = ntohl(*((u_int32_t*) &inbuf[0x0C])) - KERNELBASE;
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printf("Naca is at offset 0x%lx \n", naca);
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/* fseek to the naca */
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fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
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if (fread(inbuf, 0x18, 1, outputVmlinux) != 1) {
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death("Could not read naca\n", outputVmlinux, argv[4]);
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}
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xRamDisk = ntohl(*((u_int32_t *) &inbuf[0x0c]));
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xRamDiskSize = ntohl(*((u_int32_t *) &inbuf[0x14]));
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/* Make sure a RAM disk isn't already present */
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if ((xRamDisk != 0) || (xRamDiskSize != 0)) {
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death("RAM disk is already attached to this kernel\n", outputVmlinux, argv[4]);
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}
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/* Fill in the values */
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*((u_int32_t *) &inbuf[0x0c]) = htonl(ramStartOffs);
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*((u_int32_t *) &inbuf[0x14]) = htonl(ramPages);
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/* Write out the new naca */
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fflush(outputVmlinux);
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fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
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if (fwrite(inbuf, 0x18, 1, outputVmlinux) != 1) {
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death("Could not write naca\n", outputVmlinux, argv[4]);
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}
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printf("Ram Disk of 0x%lx pages is attached to the kernel at offset 0x%08x\n",
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ramPages, ramStartOffs);
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/* Done */
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fclose(outputVmlinux);
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/* Set permission to executable */
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chmod(argv[4], S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
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return 0;
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}
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