mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
94b212c29f
This also extends the code to handle 32-bit ELF vmlinux files as well as 64-bit ones. This is sufficient for booting on new-world 32-bit powermacs (i.e. all recent machines). Signed-off-by: Paul Mackerras <paulus@samba.org>
312 lines
8.9 KiB
C
312 lines
8.9 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <netinet/in.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
#include <elf.h>
|
|
|
|
#define ElfHeaderSize (64 * 1024)
|
|
#define ElfPages (ElfHeaderSize / 4096)
|
|
#define KERNELBASE (0xc000000000000000)
|
|
#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
|
|
|
|
struct addr_range {
|
|
unsigned long long addr;
|
|
unsigned long memsize;
|
|
unsigned long offset;
|
|
};
|
|
|
|
static int check_elf64(void *p, int size, struct addr_range *r)
|
|
{
|
|
Elf64_Ehdr *elf64 = p;
|
|
Elf64_Phdr *elf64ph;
|
|
|
|
if (elf64->e_ident[EI_MAG0] != ELFMAG0 ||
|
|
elf64->e_ident[EI_MAG1] != ELFMAG1 ||
|
|
elf64->e_ident[EI_MAG2] != ELFMAG2 ||
|
|
elf64->e_ident[EI_MAG3] != ELFMAG3 ||
|
|
elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
|
|
elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
|
|
elf64->e_type != ET_EXEC || elf64->e_machine != EM_PPC64)
|
|
return 0;
|
|
|
|
if ((elf64->e_phoff + sizeof(Elf64_Phdr)) > size)
|
|
return 0;
|
|
|
|
elf64ph = (Elf64_Phdr *) ((unsigned long)elf64 +
|
|
(unsigned long)elf64->e_phoff);
|
|
|
|
r->memsize = (unsigned long)elf64ph->p_memsz;
|
|
r->offset = (unsigned long)elf64ph->p_offset;
|
|
r->addr = (unsigned long long)elf64ph->p_vaddr;
|
|
|
|
#ifdef DEBUG
|
|
printf("PPC64 ELF file, ph:\n");
|
|
printf("p_type 0x%08x\n", elf64ph->p_type);
|
|
printf("p_flags 0x%08x\n", elf64ph->p_flags);
|
|
printf("p_offset 0x%016llx\n", elf64ph->p_offset);
|
|
printf("p_vaddr 0x%016llx\n", elf64ph->p_vaddr);
|
|
printf("p_paddr 0x%016llx\n", elf64ph->p_paddr);
|
|
printf("p_filesz 0x%016llx\n", elf64ph->p_filesz);
|
|
printf("p_memsz 0x%016llx\n", elf64ph->p_memsz);
|
|
printf("p_align 0x%016llx\n", elf64ph->p_align);
|
|
printf("... skipping 0x%08lx bytes of ELF header\n",
|
|
(unsigned long)elf64ph->p_offset);
|
|
#endif
|
|
|
|
return 64;
|
|
}
|
|
void get4k(FILE *file, char *buf )
|
|
{
|
|
unsigned j;
|
|
unsigned num = fread(buf, 1, 4096, file);
|
|
for ( j=num; j<4096; ++j )
|
|
buf[j] = 0;
|
|
}
|
|
|
|
void put4k(FILE *file, char *buf )
|
|
{
|
|
fwrite(buf, 1, 4096, file);
|
|
}
|
|
|
|
void death(const char *msg, FILE *fdesc, const char *fname)
|
|
{
|
|
fprintf(stderr, msg);
|
|
fclose(fdesc);
|
|
unlink(fname);
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char inbuf[4096];
|
|
struct addr_range vmlinux;
|
|
FILE *ramDisk;
|
|
FILE *inputVmlinux;
|
|
FILE *outputVmlinux;
|
|
|
|
char *rd_name, *lx_name, *out_name;
|
|
|
|
size_t i;
|
|
unsigned long ramFileLen;
|
|
unsigned long ramLen;
|
|
unsigned long roundR;
|
|
unsigned long offset_end;
|
|
|
|
unsigned long kernelLen;
|
|
unsigned long actualKernelLen;
|
|
unsigned long round;
|
|
unsigned long roundedKernelLen;
|
|
unsigned long ramStartOffs;
|
|
unsigned long ramPages;
|
|
unsigned long roundedKernelPages;
|
|
unsigned long hvReleaseData;
|
|
u_int32_t eyeCatcher = 0xc8a5d9c4;
|
|
unsigned long naca;
|
|
unsigned long xRamDisk;
|
|
unsigned long xRamDiskSize;
|
|
long padPages;
|
|
|
|
|
|
if (argc < 2) {
|
|
fprintf(stderr, "Name of RAM disk file missing.\n");
|
|
exit(1);
|
|
}
|
|
rd_name = argv[1];
|
|
|
|
if (argc < 3) {
|
|
fprintf(stderr, "Name of vmlinux file missing.\n");
|
|
exit(1);
|
|
}
|
|
lx_name = argv[2];
|
|
|
|
if (argc < 4) {
|
|
fprintf(stderr, "Name of vmlinux output file missing.\n");
|
|
exit(1);
|
|
}
|
|
out_name = argv[3];
|
|
|
|
|
|
ramDisk = fopen(rd_name, "r");
|
|
if ( ! ramDisk ) {
|
|
fprintf(stderr, "RAM disk file \"%s\" failed to open.\n", rd_name);
|
|
exit(1);
|
|
}
|
|
|
|
inputVmlinux = fopen(lx_name, "r");
|
|
if ( ! inputVmlinux ) {
|
|
fprintf(stderr, "vmlinux file \"%s\" failed to open.\n", lx_name);
|
|
exit(1);
|
|
}
|
|
|
|
outputVmlinux = fopen(out_name, "w+");
|
|
if ( ! outputVmlinux ) {
|
|
fprintf(stderr, "output vmlinux file \"%s\" failed to open.\n", out_name);
|
|
exit(1);
|
|
}
|
|
|
|
i = fread(inbuf, 1, sizeof(inbuf), inputVmlinux);
|
|
if (i != sizeof(inbuf)) {
|
|
fprintf(stderr, "can not read vmlinux file %s: %u\n", lx_name, i);
|
|
exit(1);
|
|
}
|
|
|
|
i = check_elf64(inbuf, sizeof(inbuf), &vmlinux);
|
|
if (i == 0) {
|
|
fprintf(stderr, "You must have a linux kernel specified as argv[2]\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* Input Vmlinux file */
|
|
fseek(inputVmlinux, 0, SEEK_END);
|
|
kernelLen = ftell(inputVmlinux);
|
|
fseek(inputVmlinux, 0, SEEK_SET);
|
|
printf("kernel file size = %lu\n", kernelLen);
|
|
|
|
actualKernelLen = kernelLen - ElfHeaderSize;
|
|
|
|
printf("actual kernel length (minus ELF header) = %lu\n", actualKernelLen);
|
|
|
|
round = actualKernelLen % 4096;
|
|
roundedKernelLen = actualKernelLen;
|
|
if ( round )
|
|
roundedKernelLen += (4096 - round);
|
|
printf("Vmlinux length rounded up to a 4k multiple = %ld/0x%lx \n", roundedKernelLen, roundedKernelLen);
|
|
roundedKernelPages = roundedKernelLen / 4096;
|
|
printf("Vmlinux pages to copy = %ld/0x%lx \n", roundedKernelPages, roundedKernelPages);
|
|
|
|
offset_end = _ALIGN_UP(vmlinux.memsize, 4096);
|
|
/* calc how many pages we need to insert between the vmlinux and the start of the ram disk */
|
|
padPages = offset_end/4096 - roundedKernelPages;
|
|
|
|
/* Check and see if the vmlinux is already larger than _end in System.map */
|
|
if (padPages < 0) {
|
|
/* vmlinux is larger than _end - adjust the offset to the start of the embedded ram disk */
|
|
offset_end = roundedKernelLen;
|
|
printf("vmlinux is larger than _end indicates it needs to be - offset_end = %lx \n", offset_end);
|
|
padPages = 0;
|
|
printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
|
|
}
|
|
else {
|
|
/* _end is larger than vmlinux - use the offset to _end that we calculated from the system map */
|
|
printf("vmlinux is smaller than _end indicates is needed - offset_end = %lx \n", offset_end);
|
|
printf("will insert %lx pages between the vmlinux and the start of the ram disk \n", padPages);
|
|
}
|
|
|
|
|
|
|
|
/* Input Ram Disk file */
|
|
// Set the offset that the ram disk will be started at.
|
|
ramStartOffs = offset_end; /* determined from the input vmlinux file and the system map */
|
|
printf("Ram Disk will start at offset = 0x%lx \n", ramStartOffs);
|
|
|
|
fseek(ramDisk, 0, SEEK_END);
|
|
ramFileLen = ftell(ramDisk);
|
|
fseek(ramDisk, 0, SEEK_SET);
|
|
printf("%s file size = %ld/0x%lx \n", rd_name, ramFileLen, ramFileLen);
|
|
|
|
ramLen = ramFileLen;
|
|
|
|
roundR = 4096 - (ramLen % 4096);
|
|
if ( roundR ) {
|
|
printf("Rounding RAM disk file up to a multiple of 4096, adding %ld/0x%lx \n", roundR, roundR);
|
|
ramLen += roundR;
|
|
}
|
|
|
|
printf("Rounded RAM disk size is %ld/0x%lx \n", ramLen, ramLen);
|
|
ramPages = ramLen / 4096;
|
|
printf("RAM disk pages to copy = %ld/0x%lx\n", ramPages, ramPages);
|
|
|
|
|
|
|
|
// Copy 64K ELF header
|
|
for (i=0; i<(ElfPages); ++i) {
|
|
get4k( inputVmlinux, inbuf );
|
|
put4k( outputVmlinux, inbuf );
|
|
}
|
|
|
|
/* Copy the vmlinux (as full pages). */
|
|
fseek(inputVmlinux, ElfHeaderSize, SEEK_SET);
|
|
for ( i=0; i<roundedKernelPages; ++i ) {
|
|
get4k( inputVmlinux, inbuf );
|
|
put4k( outputVmlinux, inbuf );
|
|
}
|
|
|
|
/* Insert pad pages (if appropriate) that are needed between */
|
|
/* | the end of the vmlinux and the ram disk. */
|
|
for (i=0; i<padPages; ++i) {
|
|
memset(inbuf, 0, 4096);
|
|
put4k(outputVmlinux, inbuf);
|
|
}
|
|
|
|
/* Copy the ram disk (as full pages). */
|
|
for ( i=0; i<ramPages; ++i ) {
|
|
get4k( ramDisk, inbuf );
|
|
put4k( outputVmlinux, inbuf );
|
|
}
|
|
|
|
/* Close the input files */
|
|
fclose(ramDisk);
|
|
fclose(inputVmlinux);
|
|
/* And flush the written output file */
|
|
fflush(outputVmlinux);
|
|
|
|
|
|
|
|
/* Fixup the new vmlinux to contain the ram disk starting offset (xRamDisk) and the ram disk size (xRamDiskSize) */
|
|
/* fseek to the hvReleaseData pointer */
|
|
fseek(outputVmlinux, ElfHeaderSize + 0x24, SEEK_SET);
|
|
if (fread(&hvReleaseData, 4, 1, outputVmlinux) != 1) {
|
|
death("Could not read hvReleaseData pointer\n", outputVmlinux, out_name);
|
|
}
|
|
hvReleaseData = ntohl(hvReleaseData); /* Convert to native int */
|
|
printf("hvReleaseData is at %08lx\n", hvReleaseData);
|
|
|
|
/* fseek to the hvReleaseData */
|
|
fseek(outputVmlinux, ElfHeaderSize + hvReleaseData, SEEK_SET);
|
|
if (fread(inbuf, 0x40, 1, outputVmlinux) != 1) {
|
|
death("Could not read hvReleaseData\n", outputVmlinux, out_name);
|
|
}
|
|
/* Check hvReleaseData sanity */
|
|
if (memcmp(inbuf, &eyeCatcher, 4) != 0) {
|
|
death("hvReleaseData is invalid\n", outputVmlinux, out_name);
|
|
}
|
|
/* Get the naca pointer */
|
|
naca = ntohl(*((u_int32_t*) &inbuf[0x0C])) - KERNELBASE;
|
|
printf("Naca is at offset 0x%lx \n", naca);
|
|
|
|
/* fseek to the naca */
|
|
fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
|
|
if (fread(inbuf, 0x18, 1, outputVmlinux) != 1) {
|
|
death("Could not read naca\n", outputVmlinux, out_name);
|
|
}
|
|
xRamDisk = ntohl(*((u_int32_t *) &inbuf[0x0c]));
|
|
xRamDiskSize = ntohl(*((u_int32_t *) &inbuf[0x14]));
|
|
/* Make sure a RAM disk isn't already present */
|
|
if ((xRamDisk != 0) || (xRamDiskSize != 0)) {
|
|
death("RAM disk is already attached to this kernel\n", outputVmlinux, out_name);
|
|
}
|
|
/* Fill in the values */
|
|
*((u_int32_t *) &inbuf[0x0c]) = htonl(ramStartOffs);
|
|
*((u_int32_t *) &inbuf[0x14]) = htonl(ramPages);
|
|
|
|
/* Write out the new naca */
|
|
fflush(outputVmlinux);
|
|
fseek(outputVmlinux, ElfHeaderSize + naca, SEEK_SET);
|
|
if (fwrite(inbuf, 0x18, 1, outputVmlinux) != 1) {
|
|
death("Could not write naca\n", outputVmlinux, out_name);
|
|
}
|
|
printf("Ram Disk of 0x%lx pages is attached to the kernel at offset 0x%08lx\n",
|
|
ramPages, ramStartOffs);
|
|
|
|
/* Done */
|
|
fclose(outputVmlinux);
|
|
/* Set permission to executable */
|
|
chmod(out_name, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
|
|
|
|
return 0;
|
|
}
|
|
|