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14c19edaaf
Modify build_mem_region to support an unaligned starting address. This makes it symmetrical with regard to starting and ending partial pages; previously, build_mem_region only support partial pages at the end of a section (caller was responsible for handling the first page). Remove the edge case handling of the first page from build_sections now that build_mem_region does not have alignment restrictions. Change the section_info_t parameter in build_mem_region to be a const reference to eliminate any need to check for a null pointer. Make the raw_data pointer in section_info_t const, as the source file's data should never be modified. This is currently cast away via GET_PTR in build_pages when calling into add_enclave_page; the add_enclave_page flow can be modified by a future commit to retain the const modifier. Add two utilities, is_relocation_page and build_partial_page, to reduce copy-paste code. Add PAGE_OFFSET macro to calculate the offset within a page. Assert on address/size alignment in build_pages and build_context to document expected alignment and catch any related code bugs. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
54 lines
2.5 KiB
C++
54 lines
2.5 KiB
C++
/*
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* Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _SECTION_INFO_H_
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#define _SECTION_INFO_H_
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#include "arch.h"
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#include "util.h"
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#include <vector>
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using namespace std;
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typedef struct _section_info_t
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{
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const uint8_t *raw_data; //The file pointer to the first page of the section.
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uint64_t raw_data_size; //The size of the section or the size of the initialized section on disk.
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uint64_t rva; //The address of the first byte of the section relative to the image base when section is loaded into memory.
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uint64_t virtual_size; //The total size of the section when loaded into memory.
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si_flags_t flag; //the attribute of memory region.
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vector<uint8_t> *bitmap; //bitmap of the total image page, if bit is 1, the page should be writable.
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//the first bit of scetion in the bitmap is bitmap[(rva >> PAGE_SHIFT) / 8] & (1 << ((rva >> PAGE_SHIFT) % 8))
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//if the bitmap is NULL, then no restrict on page attribute.
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} section_info_t;
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#endif
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