Commit 74aae523 authored by topjohnwu's avatar topjohnwu

Properly support boot image header v1

Close #695
parent 48c40f95
......@@ -102,7 +102,7 @@ LOCAL_C_INCLUDES := \
LOCAL_SRC_FILES := \
magiskboot/cpio.c \
magiskboot/main.c \
magiskboot/bootimg.c \
magiskboot/bootimg.cpp \
magiskboot/hexpatch.c \
magiskboot/compress.c \
magiskboot/format.c \
......
......@@ -4,7 +4,7 @@
#ifndef _BOOT_IMAGE_H_
#define _BOOT_IMAGE_H_
typedef struct boot_img_hdr {
struct boot_img_hdr_base {
char magic[8];
uint32_t kernel_size; /* size in bytes */
......@@ -15,10 +15,19 @@ typedef struct boot_img_hdr {
uint32_t second_size; /* size in bytes */
uint32_t second_addr; /* physical load addr */
} __attribute__((packed));
struct boot_img_hdr_v0 : public boot_img_hdr_base {
uint32_t tags_addr; /* physical addr for kernel tags */
uint32_t page_size; /* flash page size we assume */
uint32_t extra_size; /* extra blob size in bytes */
/* In header v1, this field is used for header version
* However, on some devices like Samsung, this field is used to store DTB
* We will treat this field differently based on its value */
union {
uint32_t header_version; /* the version of the header */
uint32_t extra_size; /* extra blob size in bytes */
};
/* operating system version and security patch level; for
* version "A.B.C" and patch level "Y-M-D":
......@@ -34,20 +43,19 @@ typedef struct boot_img_hdr {
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed)) boot_img_hdr ;
typedef struct pxa_boot_img_hdr {
char magic[8];
uint32_t kernel_size; /* size in bytes */
uint32_t kernel_addr; /* physical load addr */
} __attribute__((packed));
uint32_t ramdisk_size; /* size in bytes */
uint32_t ramdisk_addr; /* physical load addr */
struct boot_img_hdr_v1 : public boot_img_hdr_v0 {
uint32_t recovery_dtbo_size; /* size in bytes for recovery DTBO image */
uint64_t recovery_dtbo_offset; /* offset to recovery dtbo in boot image */
uint32_t header_size;
} __attribute__((packed));
uint32_t second_size; /* size in bytes */
uint32_t second_addr; /* physical load addr */
// Default to hdr v1
typedef boot_img_hdr_v1 boot_img_hdr;
// Special Samsung header
struct boot_img_hdr_pxa : public boot_img_hdr_base {
uint32_t extra_size; /* extra blob size in bytes */
uint32_t unknown; /* unknown value */
uint32_t tags_addr; /* physical addr for kernel tags */
......@@ -60,7 +68,7 @@ typedef struct pxa_boot_img_hdr {
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed)) pxa_boot_img_hdr;
} __attribute__((packed));
/*
** +-----------------+
......@@ -74,11 +82,14 @@ typedef struct pxa_boot_img_hdr {
** +-----------------+
** | extra blob | p pages
** +-----------------+
** | recovery dtbo | q pages
** +-----------------+
**
** n = (kernel_size + page_size - 1) / page_size
** m = (ramdisk_size + page_size - 1) / page_size
** o = (second_size + page_size - 1) / page_size
** p = (extra_size + page_size - 1) / page_size
** q = (recovery_dtbo_size + page_size - 1) / page_size
**
** 0. all entities are page_size aligned in flash
** 1. kernel and ramdisk are required (size != 0)
......@@ -92,19 +103,19 @@ typedef struct pxa_boot_img_hdr {
** else: jump to kernel_addr
*/
typedef struct mtk_hdr {
struct mtk_hdr {
uint32_t magic; /* MTK magic */
uint32_t size; /* Size of the content */
char name[32]; /* The type of the header */
} __attribute__((packed)) mtk_hdr;
} __attribute__((packed));
typedef struct dhtb_hdr {
struct dhtb_hdr {
char magic[8]; /* DHTB magic */
uint8_t checksum[40]; /* Payload SHA256, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
uint32_t size; /* Payload size, whole image + SEANDROIDENFORCE + 0xFFFFFFFF */
} __attribute__((packed)) dhtb_hdr;
} __attribute__((packed));
typedef struct blob_hdr {
struct blob_hdr {
char secure_magic[20]; /* "-SIGNED-BY-SIGNBLOB-" */
uint32_t datalen; /* 0x00000000 */
uint32_t signature; /* 0x00000000 */
......@@ -118,7 +129,7 @@ typedef struct blob_hdr {
uint32_t offset; /* offset in blob where this partition starts */
uint32_t size; /* Size of data */
uint32_t version; /* 0x00000001 */
} __attribute__((packed)) blob_hdr;
} __attribute__((packed));
// Flags
#define MTK_KERNEL 0x0001
......@@ -133,16 +144,16 @@ typedef struct blob_hdr {
#define NOOKHD_FLAG 0x0200
#define ACCLAIM_FLAG 0x0400
typedef struct boot_img {
struct boot_img {
// Memory map of the whole image
void *map_addr;
uint8_t *map_addr;
size_t map_size;
// Headers
void *hdr; /* Either boot_img_hdr or pxa_boot_img_hdr */
mtk_hdr *k_hdr; /* MTK kernel header */
mtk_hdr *r_hdr; /* MTK ramdisk header */
blob_hdr *b_hdr; /* Tegra blob header */
boot_img_hdr_base *hdr; /* Android boot image header */
mtk_hdr *k_hdr; /* MTK kernel header */
mtk_hdr *r_hdr; /* MTK ramdisk header */
blob_hdr *b_hdr; /* Tegra blob header */
// Flags to indicate the state of current boot image
uint16_t flags;
......@@ -152,18 +163,67 @@ typedef struct boot_img {
format_t r_fmt;
// Pointer to dtb that is appended after kernel
void *dtb;
uint8_t *dtb;
uint32_t dt_size;
// Pointer to end of image
void *tail;
uint8_t *tail;
size_t tail_size;
// Pointers to blocks defined in header
void *kernel;
void *ramdisk;
void *second;
void *extra;
} boot_img;
uint8_t *kernel;
uint8_t *ramdisk;
uint8_t *second;
uint8_t *extra;
uint8_t *recov_dtbo;
~boot_img();
int parse_image(const char *);
void find_dtb();
void print_hdr();
/* Access elements in header */
#define IS_PXA (flags & PXA_FLAG)
#define dyn_access(x) (IS_PXA ? \
static_cast<boot_img_hdr_pxa *>(hdr)->x : \
static_cast<boot_img_hdr_v1 *>(hdr)->x)
#define dyn_get(x, t) t x() const { return dyn_access(x); }
#define dyn_set(x, t) void x(t v) { dyn_access(x) = v; }
#define hdr_get(x, t) t x() const { return IS_PXA ? 0 : static_cast<boot_img_hdr *>(hdr)->x; }
#define hdr_set(x, t) void x(t v) { if (!IS_PXA) static_cast<boot_img_hdr *>(hdr)->x = v; }
dyn_set(extra_size, uint32_t);
dyn_get(page_size, uint32_t);
dyn_get(name, char *);
dyn_get(cmdline, char *);
dyn_get(id, char *);
hdr_get(os_version, uint32_t);
hdr_get(recovery_dtbo_size, uint32_t);
hdr_set(recovery_dtbo_size, uint32_t);
hdr_get(recovery_dtbo_offset, uint32_t);
hdr_set(recovery_dtbo_offset, uint32_t);
uint32_t header_version() {
if (IS_PXA)
return 0;
uint32_t ver = static_cast<boot_img_hdr *>(hdr)->header_version;
// There won't be v4 header any time soon...
// If larger than 4, assume this field will be treated as extra_size
return ver > 4 ? 0 : ver;
}
uint32_t extra_size() {
// If header version > 0, we should treat this field as header_version
return header_version() ? 0 : dyn_access(extra_size);
}
size_t hdr_size() {
return IS_PXA ? sizeof(boot_img_hdr_pxa) : sizeof(boot_img_hdr);
}
};
#endif
#include <string.h>
#include "bootimg.h"
#include "format.h"
#define MATCH(s) (len >= (sizeof(s) - 1) && memcmp(buf, s, sizeof(s) - 1) == 0)
......
......@@ -4,20 +4,20 @@
#include <sys/types.h>
#include "logging.h"
#include "bootimg.h"
#include "format.h"
#define KERNEL_FILE "kernel"
#define RAMDISK_FILE "ramdisk.cpio"
#define SECOND_FILE "second"
#define EXTRA_FILE "extra"
#define DTB_FILE "dtb"
#define RECV_DTBO_FILE "recovery_dtbo"
#define NEW_BOOT "new-boot.img"
// Main entries
int unpack(const char *image);
void repack(const char* orig_image, const char* out_image);
void hexpatch(const char *image, const char *from, const char *to);
int parse_img(const char *image, boot_img *boot);
int cpio_commands(int argc, char *argv[]);
void comp_file(const char *method, const char *from, const char *to);
void decomp_file(char *from, const char *to);
......
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