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hw/arm/boot: take Linux/arm64 TEXT_OFFSET header field into account

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The arm64 boot protocol stipulates that the kernel must be loaded
TEXT_OFFSET bytes beyond a 2 MB aligned base address, where TEXT_OFFSET
could be any 4 KB multiple between 0 and 2 MB, and whose value can be
found in the header of the Image file.

So after attempts to load the arm64 kernel image as an ELF file or as a
U-Boot image have failed (both of which have their own way of specifying
the load offset), try to determine the TEXT_OFFSET from the image after
loading it but before mapping it as a ROM mapping into the guest address
space.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1489414630-21609-1-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-04-20 17:32:28 +01:00 committed by Peter Maydell
parent 64c8ed97cc
commit 68115ed5fc
1 changed files with 53 additions and 11 deletions
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64
hw/arm/boot.c
View file

@ -31,6 +31,9 @@
#define KERNEL_LOAD_ADDR 0x00010000
#define KERNEL64_LOAD_ADDR 0x00080000
#define ARM64_TEXT_OFFSET_OFFSET 8
#define ARM64_MAGIC_OFFSET 56
typedef enum {
FIXUP_NONE = 0, /* do nothing */
FIXUP_TERMINATOR, /* end of insns */
@ -768,6 +771,49 @@ static uint64_t arm_load_elf(struct arm_boot_info *info, uint64_t *pentry,
return ret;
}
static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base,
hwaddr *entry)
{
hwaddr kernel_load_offset = KERNEL64_LOAD_ADDR;
uint8_t *buffer;
int size;
/* On aarch64, it's the bootloader's job to uncompress the kernel. */
size = load_image_gzipped_buffer(filename, LOAD_IMAGE_MAX_GUNZIP_BYTES,
&buffer);
if (size < 0) {
gsize len;
/* Load as raw file otherwise */
if (!g_file_get_contents(filename, (char **)&buffer, &len, NULL)) {
return -1;
}
size = len;
}
/* check the arm64 magic header value -- very old kernels may not have it */
if (memcmp(buffer + ARM64_MAGIC_OFFSET, "ARM\x64", 4) == 0) {
uint64_t hdrvals[2];
/* The arm64 Image header has text_offset and image_size fields at 8 and
* 16 bytes into the Image header, respectively. The text_offset field
* is only valid if the image_size is non-zero.
*/
memcpy(&hdrvals, buffer + ARM64_TEXT_OFFSET_OFFSET, sizeof(hdrvals));
if (hdrvals[1] != 0) {
kernel_load_offset = le64_to_cpu(hdrvals[0]);
}
}
*entry = mem_base + kernel_load_offset;
rom_add_blob_fixed(filename, buffer, size, *entry);
g_free(buffer);
return size;
}
static void arm_load_kernel_notify(Notifier *notifier, void *data)
{
CPUState *cs;
@ -776,7 +822,7 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
int is_linux = 0;
uint64_t elf_entry, elf_low_addr, elf_high_addr;
int elf_machine;
hwaddr entry, kernel_load_offset;
hwaddr entry;
static const ARMInsnFixup *primary_loader;
ArmLoadKernelNotifier *n = DO_UPCAST(ArmLoadKernelNotifier,
notifier, notifier);
@ -841,14 +887,12 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
primary_loader = bootloader_aarch64;
kernel_load_offset = KERNEL64_LOAD_ADDR;
elf_machine = EM_AARCH64;
} else {
primary_loader = bootloader;
if (!info->write_board_setup) {
primary_loader += BOOTLOADER_NO_BOARD_SETUP_OFFSET;
}
kernel_load_offset = KERNEL_LOAD_ADDR;
elf_machine = EM_ARM;
}
@ -900,17 +944,15 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
&is_linux, NULL, NULL);
}
/* On aarch64, it's the bootloader's job to uncompress the kernel. */
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) && kernel_size < 0) {
entry = info->loader_start + kernel_load_offset;
kernel_size = load_image_gzipped(info->kernel_filename, entry,
info->ram_size - kernel_load_offset);
kernel_size = load_aarch64_image(info->kernel_filename,
info->loader_start, &entry);
is_linux = 1;
}
if (kernel_size < 0) {
entry = info->loader_start + kernel_load_offset;
} else if (kernel_size < 0) {
/* 32-bit ARM */
entry = info->loader_start + KERNEL_LOAD_ADDR;
kernel_size = load_image_targphys(info->kernel_filename, entry,
info->ram_size - kernel_load_offset);
info->ram_size - KERNEL_LOAD_ADDR);
is_linux = 1;
}
if (kernel_size < 0) {