On Nov 21, 2007 12:03 PM, Myles Watson <[EMAIL PROTECTED]> wrote:
> >
> > On Wed, Nov 21, 2007 at 12:13:23PM -0700, Myles Watson wrote:
> > > It makes the same changes as mentioned before, but it also uses the
> > > correct kernel image depending on the architecture. mkelfimage
> > > doesn't work with an x86_64 vmlinux, and with an i386 bzImage it
> > > generates a _much_ larger elf.
for x86_64 support
there is a patch i posted several months ago.
because late x86_64 kernel vmlinux is elf64, you need to use melfImage
to convert that to elf32.
YH
[PATCH] mkelfImage: Take elf64 vmlinux and produce elf32
change to use e_entry instead of hardcode for vmlinux
if e_entry is not equal to paddr of fist phdr, will use paddr instead, and not switch to 64bit in convert
otherwise will use e_entry and switch to 64bit in convert
also fix the bss_size calculation.
Signed-off-By: Yinghai Lu <[EMAIL PROTECTED]>
diff -uNr mkelfImage-2.7/linux-i386/convert.h mkelfImage-2.7.new/linux-i386/convert.h
--- mkelfImage-2.7/linux-i386/convert.h 2006-03-17 06:08:21.000000000 -0800
+++ mkelfImage-2.7.new/linux-i386/convert.h 2006-11-08 12:32:15.000000000 -0800
@@ -3,6 +3,8 @@
#define CONVERTLOC 0x10000
#define REAL_MODE_DATA_LOC 0x20000
#define GDTLOC 0x21000
+#define GDT64LOC 0x22000
+#define PGTLOC 0x23000
#define DEFAULT_ROOT_DEV ((0x3<<8)| 0)
@@ -18,10 +20,13 @@
struct image_parameters {
uint32_t convert_magic; /* a signature to verify mkelfImage was built properly */
uint32_t gdt_size;
+ uint32_t gdt64_size;
+ uint32_t pgt_size;
uint32_t bss_size;
uint16_t ramdisk_flags;
uint16_t root_dev;
uint32_t entry;
+ uint32_t switch_64;
uint32_t initrd_start;
uint32_t initrd_size;
uint8_t cmdline[CMDLINE_MAX];
diff -uNr mkelfImage-2.7/linux-i386/convert.lds mkelfImage-2.7.new/linux-i386/convert.lds
--- mkelfImage-2.7/linux-i386/convert.lds 2003-01-16 13:41:14.000000000 -0800
+++ mkelfImage-2.7.new/linux-i386/convert.lds 2006-11-08 12:19:12.000000000 -0800
@@ -27,7 +27,7 @@
*(.bss)
}
_end = . ;
- bss_size = _end - _bss;
+ bss_sizex = _end - _bss;
/DISCARD/ : {
*(.comment)
diff -uNr mkelfImage-2.7/linux-i386/head.S mkelfImage-2.7.new/linux-i386/head.S
--- mkelfImage-2.7/linux-i386/head.S 2003-01-24 14:48:03.000000000 -0800
+++ mkelfImage-2.7.new/linux-i386/head.S 2006-11-08 12:19:32.000000000 -0800
@@ -59,7 +59,7 @@
movl $GDTLOC, %edi
movl $(gdt_end - gdt), %ecx
rep movsb
-
+
# Linux makes stupid assumptions about the segments
# that are already setup, so setup a new gdt & ldt
# and then reload the segment registers.
@@ -95,22 +95,113 @@
# Flag to indicate we are the bootstrap processor
xorl %ebx, %ebx
+ movl switch_64, %eax
+ cmp $1, %eax
+ jz switch_to_64
+
# Clear the unspecified registers for good measure
xorl %eax, %eax
xorl %ecx, %ecx
xorl %edx, %edx
xorl %edi, %edi
- xorl %esp, %esp
xorl %ebp, %ebp
+
+ # do not clear esp, we still need to use lret later
+
+ pushl $PROT_CODE_SEG
+ movl entry, %eax
+ pushl %eax
+
+ lret
+
+switch_to_64:
+
+ /* We need to switch to 64bit before use startup_64 entry go to kernel */
+ /*
+ * Prepare for entering 64 bit mode
+ */
+ # Move the gdt64 where Linux will not smash it during decompression
+ movl %esi, %eax # save the real mode pointer
+ movl $gdt64, %esi
+ movl $GDT64LOC, %edi
+ movl $(gdt64_end - gdt64), %ecx
+ rep movsb
+ movl %eax, %esi
+
+ /* Load new GDT with the 64bit segments using 32bit descriptor */
+ lgdt gdt64
+
+ /* Enable PAE mode */
+ xorl %eax, %eax
+ btsl $5, %eax
+ movl %eax, %cr4
+
+ /*
+ * Build early 4G boot pagetable
+ */
+ /* Initialize Page tables to 0*/
+ movl $PGTLOC, %edi
+ xorl %eax, %eax
+ movl $((4096*6)/4), %ecx
+ rep stosl
+
+ /* Build Level 4 */
+ movl $(PGTLOC + 0), %edi
+ leal 0x1007 (%edi), %eax
+ movl %eax, 0(%edi)
+
+ /* Build Level 3 */
+ movl $(PGTLOC + 0x1000), %edi
+ leal 0x1007(%edi), %eax
+ movl $4, %ecx
+1: movl %eax, 0x00(%edi)
+ addl $0x00001000, %eax
+ addl $8, %edi
+ decl %ecx
+ jnz 1b
+
+ /* Build Level 2 */
+ movl $(PGTLOC + 0x2000), %edi
+ movl $0x00000183, %eax
+ movl $2048, %ecx
+1: movl %eax, 0(%edi)
+ addl $0x00200000, %eax
+ addl $8, %edi
+ decl %ecx
+ jnz 1b
+
+ /* Enable the boot page tables */
+ movl $PGTLOC, %eax
+ movl %eax, %cr3
+
+ /* Enable Long mode in EFER (Extended Feature Enable Register) */
+ movl $0xc0000080, %ecx
+ rdmsr
+ btsl $8, %eax
+ wrmsr
+
+ /* Preparing for 64bit jmp */
+ pushl $PROT_CODE_SEG
+ movl entry, %eax
+ pushl %eax
+
+ /* Enter paged protected Mode, activating Long Mode */
+ xorl %eax, %eax
+ btsl $31, %eax
+ btsl $0, %eax
+ movl %eax, %cr0
+
+ /*
+ * At this point we're in long mode but in 32bit compatibility mode
+ * with EFER.LME = 1, CS.L = 0, CS.D = 1 (and in turn
+ * EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we use
+ * the new gdt/idt that has __KERNEL_CS with CS.L = 1.
+ */
-
- # Jump to the linux kernel
- ljmp $ PROT_CODE_SEG , $ 0x100000
+ lret
/* Routines to query the BIOS... */
-
-
/**************************************************************************
E820_MEMSIZE - Get a listing of memory regions
**************************************************************************/
@@ -409,6 +500,7 @@
.word 0x9200 # data read/write
.word 0x00CF # granularity = 4096, 386
# (+5th nibble of limit)
+
/*
* The layout of the per-CPU GDT under Linux:
*
@@ -446,7 +538,14 @@
*/
gdt_end:
-
+gdt64:
+ .word gdt64_end - gdt64
+ .long GDT64LOC
+ .word 0
+ .quad 0x0000000000000000 /* NULL descriptor */
+ .quad 0x00af9a000000ffff /* __KERNEL_CS */
+ .quad 0x00cf92000000ffff /* __KERNEL_DS */
+gdt64_end:
.section ".trailer", "a"
/* Constants set at build time, these are at the very end of my image */
@@ -458,14 +557,20 @@
.long CONVERT_MAGIC
gdt_size:
.long gdt_end - gdt
+gdt64_size:
+ .long gdt64_end - gdt64
+pgt_size:
+ .long 4096*6
bss_size:
- .long bss_size
+ .long bss_sizex
ramdisk_flags:
.word 0
root_dev:
.word DEFAULT_ROOT_DEV
entry:
.long 0
+switch_64:
+ .long 0
initrd_start:
.long 0
initrd_size:
diff -uNr mkelfImage-2.7/linux-i386/mkelf-linux-i386.c mkelfImage-2.7.new/linux-i386/mkelf-linux-i386.c
--- mkelfImage-2.7/linux-i386/mkelf-linux-i386.c 2006-03-17 06:08:22.000000000 -0800
+++ mkelfImage-2.7.new/linux-i386/mkelf-linux-i386.c 2006-11-08 09:54:58.000000000 -0800
@@ -19,13 +19,16 @@
static void (*parse_kernel_type)(struct kernel_info *info, char *kernel_buf, size_t kernel_size);
static void parse_bzImage_kernel(struct kernel_info *info, char *kernel_buf, size_t kernel_size);
static void parse_elf32_kernel(struct kernel_info *info, char *kernel_buf, size_t kernel_size);
+static void parse_elf64_kernel(struct kernel_info *info, char *kernel_buf, size_t kernel_size);
+
+char *vmlinux_x86_64_probe(char *kernel_buf, off_t kernel_size);
char *vmlinux_i386_probe(char *kernel_buf, off_t kernel_size)
{
Elf32_Ehdr *ehdr;
Elf32_Phdr *phdr;
int i;
- int hdr1, hdr2;
+ int phdrs;
ehdr = (Elf32_Ehdr *)kernel_buf;
if (
(ehdr->e_ident[EI_MAG0] != ELFMAG0) ||
@@ -35,7 +38,8 @@
return "No ELF signature found on kernel\n";
}
if (ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
- return "Not a 32bit ELF kernel\n";
+ return vmlinux_x86_64_probe(kernel_buf, kernel_size);
+// return "Not a 32bit ELF kernel\n";
}
if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
return "Not a little endian ELF kernel\n";
@@ -54,27 +58,64 @@
return "Kernel uses bad program header size.\n";
}
phdr = (Elf32_Phdr *)(kernel_buf + le32_to_cpu(ehdr->e_phoff));
- hdr1 = hdr2 = -1;
- for(i = 0; i < le32_to_cpu(ehdr->e_phnum); i++) {
+ phdrs = 0;
+ for(i = 0; i < le16_to_cpu(ehdr->e_phnum); i++) {
if (le32_to_cpu(phdr[i].p_type) != PT_LOAD)
continue;
- if (((hdr1 != -1) &&
- ((le32_to_cpu(phdr[hdr1].p_paddr) & 0xfffffff) != 0x100000)) ||
- (hdr2 != -1)) {
- return "Too many PT_LOAD segments to be a linux kernel\n";
- }
- if (hdr1 == -1) {
- hdr1 = i;
- } else {
- hdr2 = i;
- }
+ phdrs++;
}
- if (hdr1 == -1) {
+ if (phdrs == 0) {
return "No PT_LOAD segments!\n";
}
parse_kernel_type = parse_elf32_kernel;
return 0;
}
+char *vmlinux_x86_64_probe(char *kernel_buf, off_t kernel_size)
+{
+ Elf64_Ehdr *ehdr;
+ Elf64_Phdr *phdr;
+ int i;
+ int phdrs = 0;
+ ehdr = (Elf64_Ehdr *)kernel_buf;
+ if (
+ (ehdr->e_ident[EI_MAG0] != ELFMAG0) ||
+ (ehdr->e_ident[EI_MAG1] != ELFMAG1) ||
+ (ehdr->e_ident[EI_MAG2] != ELFMAG2) ||
+ (ehdr->e_ident[EI_MAG3] != ELFMAG3)) {
+ return "No ELF signature found on kernel\n";
+ }
+ if (ehdr->e_ident[EI_CLASS] != ELFCLASS64) {
+ return "Not a 64bit ELF kernel\n";
+ }
+ if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
+ return "Not a little endian ELF kernel\n";
+ }
+ if (le16_to_cpu(ehdr->e_type) != ET_EXEC) {
+ return "Not an executable kernel\n";
+ }
+ if (le16_to_cpu(ehdr->e_machine) != EM_X86_64) {
+ return "Not an x86_64 kernel\n";
+ }
+ if ( (ehdr->e_ident[EI_VERSION] != EV_CURRENT) ||
+ (le32_to_cpu(ehdr->e_version) != EV_CURRENT)) {
+ return "Kernel not using ELF version 1.\n";
+ }
+ if (le16_to_cpu(ehdr->e_phentsize) != sizeof(*phdr)) {
+ return "Kernel uses bad program header size.\n";
+ }
+ phdr = (Elf64_Phdr *)(kernel_buf + le64_to_cpu(ehdr->e_phoff));
+ phdrs = 0;
+ for(i = 0; i < le16_to_cpu(ehdr->e_phnum); i++) {
+ if (le32_to_cpu(phdr[i].p_type) != PT_LOAD)
+ continue;
+ phdrs++;
+ }
+ if (phdrs == 0) {
+ return "No PT_LOAD segments!\n";
+ }
+ parse_kernel_type = parse_elf64_kernel;
+ return 0;
+}
char *bzImage_i386_probe(char *kernel_buf, off_t kernel_size)
{
@@ -118,17 +159,14 @@
struct kernel_info
{
- void *kernel;
- size_t filesz;
- size_t memsz;
- size_t paddr;
- size_t vaddr;
- void *kernel2;
- size_t filesz2;
- size_t memsz2;
- size_t paddr2;
- size_t vaddr2;
+ int phdrs;
+ void *kernel[4];
+ size_t filesz[4];
+ size_t memsz[4];
+ size_t paddr[4];
+ size_t vaddr[4];
size_t entry;
+ size_t switch_64;
char *version;
};
@@ -137,43 +175,68 @@
Elf32_Ehdr *ehdr;
Elf32_Phdr *phdr;
int i;
- int hdr1, hdr2;
+ int phdrs;
ehdr = (Elf32_Ehdr *)kernel_buf;
phdr = (Elf32_Phdr *)(kernel_buf + ehdr->e_phoff);
- hdr1 = hdr2 = -1;
+ phdrs = 0;
for(i = 0; i < le16_to_cpu(ehdr->e_phnum); i++) {
if (le32_to_cpu(phdr[i].p_type) != PT_LOAD)
continue;
- if (hdr2 != -1) {
- die("Too many PT_LOAD segments to be a linux kernel\n");
- }
- if (hdr1 == -1) {
- hdr1 = i;
- } else {
- hdr2 = i;
- }
- }
- if (hdr1 == -1) {
- die("No PT_LOAD segments!\n");
+ info->kernel[phdrs] = kernel_buf + le32_to_cpu(phdr[i].p_offset);
+ info->filesz[phdrs] = le32_to_cpu(phdr[i].p_filesz);
+ info->memsz[phdrs] = le32_to_cpu(phdr[i].p_memsz);
+ info->paddr[phdrs] = le32_to_cpu(phdr[i].p_paddr) & 0xfffffff;
+ info->vaddr[phdrs] = le32_to_cpu(phdr[i].p_vaddr);
+ phdrs++;
}
- info->kernel = kernel_buf + le32_to_cpu(phdr[hdr1].p_offset);
- info->filesz = le32_to_cpu(phdr[hdr1].p_filesz);
- info->memsz = le32_to_cpu(phdr[hdr1].p_memsz);
- info->paddr = le32_to_cpu(phdr[hdr1].p_paddr) & 0xfffffff;
- info->vaddr = le32_to_cpu(phdr[hdr1].p_vaddr);
-
- if (hdr2 != -1) {
- info->kernel2 = kernel_buf + le32_to_cpu(phdr[hdr2].p_offset);
- info->filesz2 = le32_to_cpu(phdr[hdr2].p_filesz);
- info->memsz2 = le32_to_cpu(phdr[hdr2].p_memsz);
- info->paddr2 = le32_to_cpu(phdr[hdr2].p_paddr) & 0xfffffff;
- info->vaddr2 = le32_to_cpu(phdr[hdr2].p_vaddr);
+
+ if(!phdrs)
+ die("We need at least one phdr\n");
+
+ info->phdrs = phdrs;
+ info->entry = le32_to_cpu(ehdr->e_entry);
+ info->switch_64 = 0; //not convert from elf64
+ info->version = "unknown";
+}
+
+static void parse_elf64_kernel(struct kernel_info *info, char *kernel_buf, size_t kernel_size)
+{
+ Elf64_Ehdr *ehdr;
+ Elf64_Phdr *phdr;
+ int i;
+ int phdrs;
+ ehdr = (Elf64_Ehdr *)kernel_buf;
+ phdr = (Elf64_Phdr *)(kernel_buf + le64_to_cpu(ehdr->e_phoff));
+
+ phdrs = 0;
+ for(i = 0; i < le16_to_cpu(ehdr->e_phnum); i++) {
+ if (le32_to_cpu(phdr[i].p_type) != PT_LOAD)
+ continue;
+ info->kernel[phdrs] = kernel_buf + le64_to_cpu(phdr[i].p_offset);
+ info->filesz[phdrs] = le64_to_cpu(phdr[i].p_filesz);
+ info->memsz[phdrs] = le64_to_cpu(phdr[i].p_memsz);
+ info->paddr[phdrs] = le64_to_cpu(phdr[i].p_paddr) & 0xffffff;
+ info->vaddr[phdrs] = le64_to_cpu(phdr[i].p_vaddr);
+ phdrs++;
}
+
+ if(!phdrs)
+ die("We need at least one phdr\n");
- info->entry = 0x100000;
- info->version = "unknown";
+ info->phdrs = phdrs;
+ info->entry = le64_to_cpu(ehdr->e_entry);
+#if 0
+ if (info->entry != info->paddr[0]) {
+ info->entry = info->paddr[0]; // we still have startup_32 there
+ info->switch_64 = 0; //not convert from elf64
+ } else
+#endif
+ info->switch_64 = 1; //convert from elf64
+
+ info->version = "unknown";
}
+
static void parse_bzImage_kernel(struct kernel_info *info, char *kernel_buf, size_t kernel_size)
{
struct x86_linux_header *hdr;
@@ -186,12 +249,14 @@
}
offset = 512 + (512 *setup_sects);
- info->kernel = kernel_buf + offset;
- info->filesz = kernel_size - offset;
- info->memsz = 0x700000;
- info->paddr = 0x100000;
- info->vaddr = 0x100000;
- info->entry = info->paddr;
+ info->kernel[0] = kernel_buf + offset;
+ info->filesz[0] = kernel_size - offset;
+ info->memsz[0] = 0x700000;
+ info->paddr[0] = 0x100000;
+ info->vaddr[0] = 0x100000;
+ info->phdrs = 1;
+ info->entry = info->paddr[0];
+ info->switch_64 = 0; //not convert from elf64, even later bzImage become elf64, it still includes startup_32
info->version = kernel_buf + 512 + le16_to_cpu(hdr->kver_addr);
}
@@ -237,6 +302,7 @@
struct kernel_info kinfo;
struct image_parameters *params;
int index;
+ int i;
int opt;
static const struct option options[] = {
@@ -310,7 +376,7 @@
/* Add a program header for the note section */
index = 4;
- index += kinfo.kernel2 ? 1:0;
+ index += (kinfo.phdrs - 1);
index += ramdisk_size ? 1:0;
phdr = add_program_headers(ehdr, index);
@@ -328,23 +394,24 @@
phdr[2].p_paddr = REAL_MODE_DATA_LOC;
phdr[2].p_vaddr = REAL_MODE_DATA_LOC;
phdr[2].p_filesz = 0;
- phdr[2].p_memsz = (GDTLOC - REAL_MODE_DATA_LOC) + params->gdt_size;
+ if(!kinfo.switch_64)
+ phdr[2].p_memsz = (GDTLOC - REAL_MODE_DATA_LOC) + params->gdt_size;
+ else
+ phdr[2].p_memsz = (PGTLOC - REAL_MODE_DATA_LOC) + params->pgt_size;
phdr[2].p_data = 0;
- phdr[3].p_paddr = kinfo.paddr;
- phdr[3].p_vaddr = kinfo.vaddr;
- phdr[3].p_filesz = kinfo.filesz;
- phdr[3].p_memsz = kinfo.memsz;
- phdr[3].p_data = kinfo.kernel;
+ if( (phdr[1].p_paddr + phdr[1].p_memsz) > phdr[2].p_paddr) {
+ die("Internal error: need to increase REAL_MODE_DATA_LOC !\n");
+ }
- index = 4;
+ index = 3;
/* Put the second kernel frament if present */
- if (kinfo.kernel2) {
- phdr[index].p_paddr = kinfo.paddr2;
- phdr[index].p_vaddr = kinfo.vaddr2;
- phdr[index].p_filesz = kinfo.filesz2;
- phdr[index].p_memsz = kinfo.memsz2;
- phdr[index].p_data = kinfo.kernel2;
+ for(i=0;i<kinfo.phdrs;i++) {
+ phdr[index].p_paddr = kinfo.paddr[i];
+ phdr[index].p_vaddr = kinfo.vaddr[i];
+ phdr[index].p_filesz = kinfo.filesz[i];
+ phdr[index].p_memsz = kinfo.memsz[i];
+ phdr[index].p_data = kinfo.kernel[i];
index++;
}
@@ -352,6 +419,10 @@
*/
params->initrd_start = params->initrd_size = 0;
if (ramdisk_size) {
+ if( (phdr[index-1].p_paddr + phdr[index-1].p_memsz) > ramdisk_base) {
+ die("need to increase increase ramdisk_base !\n");
+ }
+
phdr[index].p_paddr = ramdisk_base;
phdr[index].p_vaddr = ramdisk_base;
phdr[index].p_filesz = ramdisk_size;
@@ -364,6 +435,7 @@
/* Set the start location */
params->entry = kinfo.entry;
+ params->switch_64 = kinfo.switch_64;
ehdr->e_entry = phdr[1].p_paddr;
/* Setup the elf notes */
diff -uNr mkelfImage-2.7/linux-ia64/mkelf-linux-ia64.c mkelfImage-2.7.new/linux-ia64/mkelf-linux-ia64.c
--- mkelfImage-2.7/linux-ia64/mkelf-linux-ia64.c 2006-03-17 10:09:16.000000000 -0800
+++ mkelfImage-2.7.new/linux-ia64/mkelf-linux-ia64.c 2006-11-07 18:14:27.000000000 -0800
@@ -81,7 +81,7 @@
phdr = (Elf64_Phdr *)(kernel_buf + le64_to_cpu(ehdr->e_phoff));
phdrs = 0;
for(i = 0; i < le16_to_cpu(ehdr->e_phnum); i++) {
- if (le16_to_cpu(phdr[i].p_type) != PT_LOAD)
+ if (le32_to_cpu(phdr[i].p_type) != PT_LOAD)
continue;
phdrs++;
}
--
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