312 lines
8.9 KiB
C
312 lines
8.9 KiB
C
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#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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#include <elf.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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#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
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struct addr_range {
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unsigned long long addr;
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unsigned long memsize;
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unsigned long offset;
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};
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static int check_elf64(void *p, int size, struct addr_range *r)
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{
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Elf64_Ehdr *elf64 = p;
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Elf64_Phdr *elf64ph;
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if (elf64->e_ident[EI_MAG0] != ELFMAG0 ||
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elf64->e_ident[EI_MAG1] != ELFMAG1 ||
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elf64->e_ident[EI_MAG2] != ELFMAG2 ||
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elf64->e_ident[EI_MAG3] != ELFMAG3 ||
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elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
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elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
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elf64->e_type != ET_EXEC || elf64->e_machine != EM_PPC64)
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return 0;
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if ((elf64->e_phoff + sizeof(Elf64_Phdr)) > size)
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return 0;
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elf64ph = (Elf64_Phdr *) ((unsigned long)elf64 +
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(unsigned long)elf64->e_phoff);
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r->memsize = (unsigned long)elf64ph->p_memsz;
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r->offset = (unsigned long)elf64ph->p_offset;
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r->addr = (unsigned long long)elf64ph->p_vaddr;
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#ifdef DEBUG
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printf("PPC64 ELF file, ph:\n");
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printf("p_type 0x%08x\n", elf64ph->p_type);
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printf("p_flags 0x%08x\n", elf64ph->p_flags);
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printf("p_offset 0x%016llx\n", elf64ph->p_offset);
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printf("p_vaddr 0x%016llx\n", elf64ph->p_vaddr);
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printf("p_paddr 0x%016llx\n", elf64ph->p_paddr);
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printf("p_filesz 0x%016llx\n", elf64ph->p_filesz);
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printf("p_memsz 0x%016llx\n", elf64ph->p_memsz);
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printf("p_align 0x%016llx\n", elf64ph->p_align);
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printf("... skipping 0x%08lx bytes of ELF header\n",
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(unsigned long)elf64ph->p_offset);
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#endif
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return 64;
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}
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static 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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static 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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static 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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struct addr_range vmlinux;
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FILE *ramDisk;
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FILE *inputVmlinux;
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FILE *outputVmlinux;
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char *rd_name, *lx_name, *out_name;
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size_t i;
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unsigned long ramFileLen;
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unsigned long ramLen;
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unsigned long roundR;
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unsigned long offset_end;
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unsigned long kernelLen;
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unsigned long actualKernelLen;
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unsigned long round;
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unsigned long roundedKernelLen;
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unsigned long ramStartOffs;
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unsigned long ramPages;
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unsigned long roundedKernelPages;
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unsigned long hvReleaseData;
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u_int32_t eyeCatcher = 0xc8a5d9c4;
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unsigned long naca;
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unsigned long xRamDisk;
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unsigned long xRamDiskSize;
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long padPages;
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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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rd_name = argv[1];
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if (argc < 3) {
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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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lx_name = argv[2];
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if (argc < 4) {
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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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out_name = argv[3];
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ramDisk = fopen(rd_name, "r");
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if ( ! ramDisk ) {
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fprintf(stderr, "RAM disk file \"%s\" failed to open.\n", rd_name);
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exit(1);
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}
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inputVmlinux = fopen(lx_name, "r");
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if ( ! inputVmlinux ) {
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fprintf(stderr, "vmlinux file \"%s\" failed to open.\n", lx_name);
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exit(1);
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}
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outputVmlinux = fopen(out_name, "w+");
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if ( ! outputVmlinux ) {
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fprintf(stderr, "output vmlinux file \"%s\" failed to open.\n", out_name);
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exit(1);
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}
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i = fread(inbuf, 1, sizeof(inbuf), inputVmlinux);
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if (i != sizeof(inbuf)) {
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fprintf(stderr, "can not read vmlinux file %s: %u\n", lx_name, i);
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exit(1);
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}
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i = check_elf64(inbuf, sizeof(inbuf), &vmlinux);
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if (i == 0) {
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fprintf(stderr, "You must have a linux kernel specified as argv[2]\n");
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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 = %lu\n", kernelLen);
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actualKernelLen = kernelLen - ElfHeaderSize;
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printf("actual kernel length (minus ELF header) = %lu\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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offset_end = _ALIGN_UP(vmlinux.memsize, 4096);
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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", rd_name, 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, out_name);
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}
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hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */
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printf("hvReleaseData is at %08lx\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, out_name);
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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, out_name);
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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, out_name);
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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, out_name);
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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, out_name);
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}
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printf("Ram Disk of 0x%lx pages is attached to the kernel at offset 0x%08lx\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(out_name, 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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