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https://github.com/ARM-software/arm-trusted-firmware.git
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931f7c6156
This patch introduces Position Independant Executable(PIE) support in TF-A. As a initial prototype, only BL31 can support PIE. A trivial dynamic linker is implemented which supports fixing up Global Offset Table(GOT) and Dynamic relocations(.rela.dyn). The fixup_gdt_reloc() helper function implements this linker and this needs to be called early in the boot sequence prior to invoking C functions. The GOT is placed in the RO section of BL31 binary for improved security and the BL31 linker script is modified to export the appropriate symbols required for the dynamic linker. The C compiler always generates PC relative addresses to linker symbols and hence referencing symbols exporting constants are a problem when relocating the binary. Hence the reference to the `__PERCPU_TIMESTAMP_SIZE__` symbol in PMF is removed and is now calculated at runtime based on start and end addresses. Change-Id: I1228583ff92cf432963b7cef052e95d995cca93d Signed-off-by: Soby Mathew <soby.mathew@arm.com>
204 lines
6.5 KiB
C
204 lines
6.5 KiB
C
/*
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* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __BL_COMMON_H__
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#define __BL_COMMON_H__
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#include <ep_info.h>
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#include <param_header.h>
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#include <utils_def.h>
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#define UP U(1)
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#define DOWN U(0)
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/*******************************************************************************
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* Constants to identify the location of a memory region in a given memory
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* layout.
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******************************************************************************/
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#define TOP U(0x1)
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#define BOTTOM U(0x0)
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/*
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* The following are used for image state attributes.
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* Image can only be in one of the following state.
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*/
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#define IMAGE_STATE_RESET U(0)
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#define IMAGE_STATE_COPIED U(1)
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#define IMAGE_STATE_COPYING U(2)
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#define IMAGE_STATE_AUTHENTICATED U(3)
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#define IMAGE_STATE_EXECUTED U(4)
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#define IMAGE_STATE_INTERRUPTED U(5)
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#define IMAGE_ATTRIB_SKIP_LOADING U(0x02)
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#define IMAGE_ATTRIB_PLAT_SETUP U(0x04)
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#define INVALID_IMAGE_ID U(0xFFFFFFFF)
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/*******************************************************************************
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* Constants to indicate type of exception to the common exception handler.
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******************************************************************************/
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#define SYNC_EXCEPTION_SP_EL0 U(0x0)
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#define IRQ_SP_EL0 U(0x1)
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#define FIQ_SP_EL0 U(0x2)
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#define SERROR_SP_EL0 U(0x3)
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#define SYNC_EXCEPTION_SP_ELX U(0x4)
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#define IRQ_SP_ELX U(0x5)
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#define FIQ_SP_ELX U(0x6)
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#define SERROR_SP_ELX U(0x7)
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#define SYNC_EXCEPTION_AARCH64 U(0x8)
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#define IRQ_AARCH64 U(0x9)
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#define FIQ_AARCH64 U(0xa)
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#define SERROR_AARCH64 U(0xb)
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#define SYNC_EXCEPTION_AARCH32 U(0xc)
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#define IRQ_AARCH32 U(0xd)
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#define FIQ_AARCH32 U(0xe)
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#define SERROR_AARCH32 U(0xf)
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#ifndef __ASSEMBLY__
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#include <cassert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <utils_def.h> /* To retain compatibility */
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/*
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* Declarations of linker defined symbols to help determine memory layout of
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* BL images
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*/
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#if SEPARATE_CODE_AND_RODATA
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IMPORT_SYM(unsigned long, __TEXT_START__, BL_CODE_BASE);
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IMPORT_SYM(unsigned long, __TEXT_END__, BL_CODE_END);
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IMPORT_SYM(unsigned long, __RODATA_START__, BL_RO_DATA_BASE);
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IMPORT_SYM(unsigned long, __RODATA_END__, BL_RO_DATA_END);
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#else
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IMPORT_SYM(unsigned long, __RO_START__, BL_CODE_BASE);
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IMPORT_SYM(unsigned long, __RO_END__, BL_CODE_END);
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#endif
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#if defined(IMAGE_BL2)
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IMPORT_SYM(unsigned long, __BL2_END__, BL2_END);
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#elif defined(IMAGE_BL2U)
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IMPORT_SYM(unsigned long, __BL2U_END__, BL2U_END);
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#elif defined(IMAGE_BL31)
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IMPORT_SYM(unsigned long, __BL31_START__, BL31_START);
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IMPORT_SYM(unsigned long, __BL31_END__, BL31_END);
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#elif defined(IMAGE_BL32)
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IMPORT_SYM(unsigned long, __BL32_END__, BL32_END);
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#endif /* IMAGE_BLX */
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/*
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* The next 2 constants identify the extents of the coherent memory region.
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* These addresses are used by the MMU setup code and therefore they must be
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* page-aligned. It is the responsibility of the linker script to ensure that
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* __COHERENT_RAM_START__ and __COHERENT_RAM_END__ linker symbols refer to
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* page-aligned addresses.
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*/
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#if USE_COHERENT_MEM
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IMPORT_SYM(unsigned long, __COHERENT_RAM_START__, BL_COHERENT_RAM_BASE);
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IMPORT_SYM(unsigned long, __COHERENT_RAM_END__, BL_COHERENT_RAM_END);
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#endif
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/*******************************************************************************
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* Structure used for telling the next BL how much of a particular type of
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* memory is available for its use and how much is already used.
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******************************************************************************/
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typedef struct meminfo {
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uintptr_t total_base;
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size_t total_size;
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} meminfo_t;
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/*****************************************************************************
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* Image info binary provides information from the image loader that
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* can be used by the firmware to manage available trusted RAM.
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* More advanced firmware image formats can provide additional
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* information that enables optimization or greater flexibility in the
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* common firmware code
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*****************************************************************************/
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typedef struct image_info {
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param_header_t h;
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uintptr_t image_base; /* physical address of base of image */
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uint32_t image_size; /* bytes read from image file */
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uint32_t image_max_size;
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} image_info_t;
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/*****************************************************************************
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* The image descriptor struct definition.
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*****************************************************************************/
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typedef struct image_desc {
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/* Contains unique image id for the image. */
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unsigned int image_id;
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/*
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* This member contains Image state information.
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* Refer IMAGE_STATE_XXX defined above.
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*/
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unsigned int state;
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uint32_t copied_size; /* image size copied in blocks */
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image_info_t image_info;
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entry_point_info_t ep_info;
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} image_desc_t;
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/* BL image node in the BL image loading sequence */
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typedef struct bl_load_info_node {
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unsigned int image_id;
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image_info_t *image_info;
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struct bl_load_info_node *next_load_info;
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} bl_load_info_node_t;
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/* BL image head node in the BL image loading sequence */
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typedef struct bl_load_info {
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param_header_t h;
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bl_load_info_node_t *head;
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} bl_load_info_t;
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/* BL image node in the BL image execution sequence */
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typedef struct bl_params_node {
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unsigned int image_id;
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image_info_t *image_info;
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entry_point_info_t *ep_info;
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struct bl_params_node *next_params_info;
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} bl_params_node_t;
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/*
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* BL image head node in the BL image execution sequence
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* It is also used to pass information to next BL image.
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*/
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typedef struct bl_params {
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param_header_t h;
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bl_params_node_t *head;
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} bl_params_t;
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/*******************************************************************************
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* Function & variable prototypes
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******************************************************************************/
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size_t get_image_size(unsigned int image_id);
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int is_mem_free(uintptr_t free_base, size_t free_size,
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uintptr_t addr, size_t size);
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int load_auth_image(unsigned int image_id, image_info_t *image_data);
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#if TRUSTED_BOARD_BOOT && defined(DYN_DISABLE_AUTH)
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/*
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* API to dynamically disable authentication. Only meant for development
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* systems.
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*/
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void dyn_disable_auth(void);
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#endif
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extern const char build_message[];
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extern const char version_string[];
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void print_entry_point_info(const entry_point_info_t *ep_info);
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uintptr_t page_align(uintptr_t value, unsigned dir);
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struct mmap_region;
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void setup_page_tables(const struct mmap_region *bl_regions,
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const struct mmap_region *plat_regions);
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#endif /*__ASSEMBLY__*/
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#endif /* __BL_COMMON_H__ */
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