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https://github.com/u-boot/u-boot.git
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1c7d0c411c
Upcoming patches are switching the memory mappings to RW, RO, RX after the U-Boot binary and its data are relocated. Add annotations in the linker scripts to and mark text, data, rodata sections and align them to a page boundary. It's worth noting that .efi_runtime memory permissions are left untouched for now. There's two problems with EFI currently. The first problem is that we bundle data, rodata and text in a single .efi_runtime section which also must be close to .text for now. As a result we also dont change the permissions for anything contained in CPUDIR/start.o. In order to fix that we have to decoule .text_rest, .text and .efi_runtime and have the runtime services on their own section with proper memory permission annotations (efi_rodata etc). The efi runtime regions (.efi_runtime_rel) can be relocated by the OS when the latter is calling SetVirtualAddressMap. Which means we have to configure those pages as RX for U-Boot but convert them to RWX just before ExitBootServices. It also needs extra code in efi_tuntime relocation code since R_AARCH64_NONE are emitted as well if we page align the section. Due to the above ignore EFI for now and fix it later once we have the rest in place. Acked-by: Jerome Forissier <jerome.forissier@linaro.org> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on AML-S905X-CC Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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*/
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/* Taken from Linux kernel, commit f56c3196 */
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#ifndef _ASM_GENERIC_SECTIONS_H_
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#define _ASM_GENERIC_SECTIONS_H_
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#include <linux/types.h>
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/* References to section boundaries */
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extern char _text[], _stext[], _etext[];
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extern char _data[], _sdata[], _edata[];
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extern char __bss_start[], __bss_stop[];
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extern char __init_begin[], __init_end[];
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extern char _sinittext[], _einittext[];
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extern char _end[], _init[];
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extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
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extern char __kprobes_text_start[], __kprobes_text_end[];
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extern char __entry_text_start[], __entry_text_end[];
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extern char __initdata_begin[], __initdata_end[];
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extern char __start_rodata[], __end_rodata[];
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extern char __start_data[], __end_data[];
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extern char __efi_helloworld_begin[];
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extern char __efi_helloworld_end[];
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extern char __efi_var_file_begin[];
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extern char __efi_var_file_end[];
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/* Private data used by of-platdata devices/uclasses */
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extern char __priv_data_start[], __priv_data_end[];
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/* Start and end of .ctors section - used for constructor calls. */
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extern char __ctors_start[], __ctors_end[];
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extern char __efi_runtime_rel_start[], __efi_runtime_rel_stop[];
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extern char __efi_runtime_start[], __efi_runtime_stop[];
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/* function descriptor handling (if any). Override
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* in asm/sections.h */
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#ifndef dereference_function_descriptor
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#define dereference_function_descriptor(p) (p)
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#endif
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/* random extra sections (if any). Override
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* in asm/sections.h */
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#ifndef arch_is_kernel_text
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static inline int arch_is_kernel_text(unsigned long addr)
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{
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return 0;
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}
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#endif
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#ifndef arch_is_kernel_data
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static inline int arch_is_kernel_data(unsigned long addr)
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{
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return 0;
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}
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#endif
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/* U-Boot-specific things begin here */
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/* Start of U-Boot text region */
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extern char __text_start[];
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extern char __text_end[];
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/* This marks the text region which must be relocated */
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extern char __image_copy_start[], __image_copy_end[];
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/* This marks the rcode region used for SPL relocation */
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extern char _rcode_start[], _rcode_end[];
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extern char __bss_end[];
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extern char __rel_dyn_start[], __rel_dyn_end[];
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extern char _image_binary_end[];
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/*
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* This is the U-Boot entry point - prior to relocation it should be same
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* as __text_start
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*/
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extern void _start(void);
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#ifndef USE_HOSTCC
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#if CONFIG_IS_ENABLED(RELOC_LOADER)
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#define __rcode __section(".text.rcode")
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#define __rdata __section(".text.rdata")
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#else
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#define __rcode
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#define __rdata
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#endif
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#else
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#define __rcode
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#define __rdata
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#endif
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#endif /* _ASM_GENERIC_SECTIONS_H_ */
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