mirror of
https://github.com/DarkMatterCore/nxdumptool.git
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144 lines
7.7 KiB
C
144 lines
7.7 KiB
C
/*
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* nso.h
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*
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* Copyright (c) 2020-2021, DarkMatterCore <pabloacurielz@gmail.com>.
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*
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* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
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*
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* nxdumptool is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* nxdumptool is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#ifndef __NSO_H__
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#define __NSO_H__
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#include "pfs.h"
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#define NSO_HEADER_MAGIC 0x4E534F30 /* "NSO0". */
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#define NSO_MOD_MAGIC 0x4D4F4430 /* "MOD0". */
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typedef enum {
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NsoFlags_TextCompress = BIT(0), ///< Determines if .text segment is LZ4-compressed.
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NsoFlags_RoCompress = BIT(1), ///< Determines if .rodata segment is LZ4-compressed.
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NsoFlags_DataCompress = BIT(2), ///< Determines if .data segment is LZ4-compressed.
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NsoFlags_TextHash = BIT(3), ///< Determines if .text segment hash must be checked during load.
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NsoFlags_RoHash = BIT(4), ///< Determines if .rodata segment hash must be checked during load.
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NsoFlags_DataHash = BIT(5) ///< Determines if .data segment hash must be checked during load.
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} NsoFlags;
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typedef struct {
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u32 file_offset; ///< NSO segment offset.
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u32 memory_offset; ///< Memory segment offset.
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u32 size; ///< Decompressed segment size.
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} NsoSegmentInfo;
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typedef struct {
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u32 offset; ///< Relative to the .rodata segment start.
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u32 size;
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} NsoSectionInfo;
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/// This is the start of every NSO.
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/// This is always followed by a NsoModuleName block.
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typedef struct {
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u32 magic; ///< "NSO0".
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u32 version; ///< Always set to 0.
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u8 reserved_1[0x4];
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u32 flags; ///< NsoFlags.
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NsoSegmentInfo text_segment_info;
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u32 module_name_offset; ///< NsoModuleName block offset.
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NsoSegmentInfo rodata_segment_info;
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u32 module_name_size; ///< NsoModuleName block size.
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NsoSegmentInfo data_segment_info;
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u32 bss_size;
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u8 module_id[0x20]; ///< Also known as build ID.
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u32 text_file_size; ///< .text segment compressed size (if NsoFlags_TextCompress is enabled).
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u32 rodata_file_size; ///< .rodata segment compressed size (if NsoFlags_RoCompress is enabled).
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u32 data_file_size; ///< .data segment compressed size (if NsoFlags_DataCompress is enabled).
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u8 reserved_2[0x1C];
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NsoSectionInfo api_info_section_info;
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NsoSectionInfo dynstr_section_info;
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NsoSectionInfo dynsym_section_info;
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u8 text_segment_hash[0x20]; ///< Decompressed .text segment SHA-256 checksum.
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u8 rodata_segment_hash[0x20]; ///< Decompressed .rodata segment SHA-256 checksum.
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u8 data_segment_hash[0x20]; ///< Decompressed .data segment SHA-256 checksum.
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} NsoHeader;
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/// Usually placed right after NsoHeader, but it's actual offset may vary.
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/// If the 'module_name_size' member from NsoHeader is greater than 1 and the 'name_length' element from NsoModuleName is greater than 0, 'name' will hold the module name.
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typedef struct {
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u8 name_length;
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char name[];
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} NsoModuleName;
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/// Placed at the very start of the decompressed .text segment.
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typedef struct {
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u32 entry_point;
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u32 mod_offset; ///< NsoModHeader block offset (relative to the start of this header). Almost always set to 0x8 (the size of this struct).
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} NsoModStart;
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/// This is essentially a replacement for the PT_DYNAMIC program header available in ELF binaries.
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/// All offsets are signed 32-bit values relative to the start of this header.
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/// This is usually placed at the start of the decompressed .text segment, right after a NsoModStart block.
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/// However, in some NSOs, it can instead be placed at the start of the decompressed .rodata segment, right after its NsoModuleInfo block.
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/// In these cases, the 'mod_offset' value from the NsoModStart block will point to an offset within the .rodata segment.
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typedef struct {
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u32 magic; ///< "MOD0".
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s32 dynamic_offset;
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s32 bss_start_offset;
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s32 bss_end_offset;
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s32 eh_frame_hdr_start_offset;
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s32 eh_frame_hdr_end_offset;
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s32 module_object_offset; ///< Typically equal to bss_start_offset.
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} NsoModHeader;
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/// Placed at the start of the decompressed .rodata segment + 0x4.
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/// If the 'name_length' element is greater than 0, 'name' will hold the module name.
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typedef struct {
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u32 name_length;
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char name[];
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} NsoModuleInfo;
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typedef struct {
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PartitionFileSystemContext *pfs_ctx; ///< PartitionFileSystemContext for the Program NCA FS section #0, which is where this NSO is stored.
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PartitionFileSystemEntry *pfs_entry; ///< PartitionFileSystemEntry for this NSO in the Program NCA FS section #0. Used to read NSO data.
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char *nso_filename; ///< Pointer to the NSO filename in the Program NCA FS section #0.
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NsoHeader nso_header; ///< NSO header.
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char *module_name; ///< Pointer to a dynamically allocated buffer that holds the NSO module name, if available. Otherwise, this is set to NULL.
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char *module_info_name; ///< Pointer to a dynamically allocated buffer that holds the .rodata module info module name, if available. Otherwise, this is set to NULL.
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char *rodata_api_info_section; ///< Pointer to a dynamically allocated buffer that holds the .rodata API info section data, if available. Otherwise, this is set to NULL.
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///< Middleware and GuidelineApi entries are retrieved from this section.
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u64 rodata_api_info_section_size; ///< .rodata API info section size, if available. Otherwise, this is set to 0. Kept here for convenience - this is part of 'nso_header'.
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char *rodata_dynstr_section; ///< Pointer to a dynamically allocated buffer that holds the .rodata dynamic string section data. UnresolvedApi data is retrieved from this section.
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u64 rodata_dynstr_section_size; ///< .rodata dynamic string section size. Kept here for convenience - this is part of 'nso_header'.
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u8 *rodata_dynsym_section; ///< Pointer to a dynamically allocated buffer that holds the .rodata dynamic symbol section data. Used to retrieve pointers to symbol strings within dynstr.
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u64 rodata_dynsym_section_size; ///< .rodata dynamic symbol section size. Kept here for convenience - this is part of 'nso_header'.
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} NsoContext;
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/// Initializes a NsoContext using a previously initialized PartitionFileSystemContext (which must belong to the ExeFS from a Program NCA) and a PartitionFileSystemEntry belonging to an underlying NSO.
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bool nsoInitializeContext(NsoContext *out, PartitionFileSystemContext *pfs_ctx, PartitionFileSystemEntry *pfs_entry);
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/// Helper inline functions.
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NX_INLINE void nsoFreeContext(NsoContext *nso_ctx)
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{
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if (!nso_ctx) return;
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if (nso_ctx->module_name) free(nso_ctx->module_name);
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if (nso_ctx->module_info_name) free(nso_ctx->module_info_name);
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if (nso_ctx->rodata_api_info_section) free(nso_ctx->rodata_api_info_section);
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if (nso_ctx->rodata_dynstr_section) free(nso_ctx->rodata_dynstr_section);
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if (nso_ctx->rodata_dynsym_section) free(nso_ctx->rodata_dynsym_section);
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memset(nso_ctx, 0, sizeof(NsoContext));
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}
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#endif /* __NSO_H__ */
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