Magisk/native/jni/magiskboot/bootimg.h
2018-10-20 00:27:56 -04:00

230 lines
7.1 KiB
C

#include <stdint.h>
#include "format.h"
#ifndef _BOOT_IMAGE_H_
#define _BOOT_IMAGE_H_
struct boot_img_hdr_base {
char magic[8];
uint32_t kernel_size; /* size in bytes */
uint32_t kernel_addr; /* physical load addr */
uint32_t ramdisk_size; /* size in bytes */
uint32_t ramdisk_addr; /* physical load addr */
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 */
/* 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":
* ver = A << 14 | B << 7 | C (7 bits for each of A, B, C)
* lvl = ((Y - 2000) & 127) << 4 | M (7 bits for Y, 4 bits for M)
* os_version = ver << 11 | lvl */
uint32_t os_version;
char name[16]; /* asciiz product name */
char cmdline[512];
char id[32]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed));
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));
// 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 */
uint32_t page_size; /* flash page size we assume */
char name[24]; /* asciiz product name */
char cmdline[512];
char id[32]; /* timestamp / checksum / sha1 / etc */
/* Supplemental command line data; kept here to maintain
* binary compatibility with older versions of mkbootimg */
char extra_cmdline[1024];
} __attribute__((packed));
/*
** +-----------------+
** | boot header | 1 page
** +-----------------+
** | kernel | n pages
** +-----------------+
** | ramdisk | m pages
** +-----------------+
** | second stage | o pages
** +-----------------+
** | 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)
** 2. second is optional (second_size == 0 -> no second)
** 3. load each element (kernel, ramdisk, second) at
** the specified physical address (kernel_addr, etc)
** 4. prepare tags at tag_addr. kernel_args[] is
** appended to the kernel commandline in the tags.
** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
** 6. if second_size != 0: jump to second_addr
** else: jump to kernel_addr
*/
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));
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));
struct blob_hdr {
char secure_magic[20]; /* "-SIGNED-BY-SIGNBLOB-" */
uint32_t datalen; /* 0x00000000 */
uint32_t signature; /* 0x00000000 */
char magic[16]; /* "MSM-RADIO-UPDATE" */
uint32_t hdr_version; /* 0x00010000 */
uint32_t hdr_size; /* Size of header */
uint32_t part_offset; /* Same as size */
uint32_t num_parts; /* Number of partitions */
uint32_t unknown[7]; /* All 0x00000000 */
char name[4]; /* Name of partition */
uint32_t offset; /* offset in blob where this partition starts */
uint32_t size; /* Size of data */
uint32_t version; /* 0x00000001 */
} __attribute__((packed));
// Flags
#define MTK_KERNEL 0x0001
#define MTK_RAMDISK 0x0002
#define CHROMEOS_FLAG 0x0004
#define PXA_FLAG 0x0008
#define DHTB_FLAG 0x0010
#define SEANDROID_FLAG 0x0020
#define LG_BUMP_FLAG 0x0040
#define SHA256_FLAG 0x0080
#define BLOB_FLAG 0x0100
#define NOOKHD_FLAG 0x0200
#define ACCLAIM_FLAG 0x0400
struct boot_img {
// Memory map of the whole image
uint8_t *map_addr;
size_t map_size;
// Headers
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;
// The format of kernel and ramdisk
format_t k_fmt;
format_t r_fmt;
// Pointer to dtb that is appended after kernel
uint8_t *dtb;
uint32_t dt_size;
// Pointer to end of image
uint8_t *tail;
size_t tail_size;
// Pointers to blocks defined in header
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