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nxdumptool/include/core/nso.h
Pablo Curiel c6c5667bf0 Change project layout + upgrade license to GPLv3.
2021-03-25 15:26:58 -04:00

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/*
* nso.h
*
* Copyright (c) 2020-2021, DarkMatterCore <pabloacurielz@gmail.com>.
*
* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
*
* nxdumptool is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nxdumptool is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#ifndef __NSO_H__
#define __NSO_H__
#include "pfs.h"
#ifdef __cplusplus
extern "C" {
#endif
#define NSO_HEADER_MAGIC 0x4E534F30 /* "NSO0". */
#define NSO_MOD_MAGIC 0x4D4F4430 /* "MOD0". */
typedef enum {
NsoFlags_TextCompress = BIT(0), ///< Determines if .text segment is LZ4-compressed.
NsoFlags_RoCompress = BIT(1), ///< Determines if .rodata segment is LZ4-compressed.
NsoFlags_DataCompress = BIT(2), ///< Determines if .data segment is LZ4-compressed.
NsoFlags_TextHash = BIT(3), ///< Determines if .text segment hash must be checked during load.
NsoFlags_RoHash = BIT(4), ///< Determines if .rodata segment hash must be checked during load.
NsoFlags_DataHash = BIT(5) ///< Determines if .data segment hash must be checked during load.
} NsoFlags;
typedef struct {
u32 file_offset; ///< NSO segment offset.
u32 memory_offset; ///< Memory segment offset.
u32 size; ///< Decompressed segment size.
} NsoSegmentInfo;
NXDT_ASSERT(NsoSegmentInfo, 0xC);
typedef struct {
u32 offset; ///< Relative to the .rodata segment start.
u32 size;
} NsoSectionInfo;
NXDT_ASSERT(NsoSectionInfo, 0x8);
/// This is the start of every NSO.
/// This is always followed by a NsoModuleName block.
typedef struct {
u32 magic; ///< "NSO0".
u32 version; ///< Always set to 0.
u8 reserved_1[0x4];
u32 flags; ///< NsoFlags.
NsoSegmentInfo text_segment_info;
u32 module_name_offset; ///< NsoModuleName block offset.
NsoSegmentInfo rodata_segment_info;
u32 module_name_size; ///< NsoModuleName block size.
NsoSegmentInfo data_segment_info;
u32 bss_size;
u8 module_id[0x20]; ///< Also known as build ID.
u32 text_file_size; ///< .text segment compressed size (if NsoFlags_TextCompress is enabled).
u32 rodata_file_size; ///< .rodata segment compressed size (if NsoFlags_RoCompress is enabled).
u32 data_file_size; ///< .data segment compressed size (if NsoFlags_DataCompress is enabled).
u8 reserved_2[0x1C];
NsoSectionInfo api_info_section_info;
NsoSectionInfo dynstr_section_info;
NsoSectionInfo dynsym_section_info;
u8 text_segment_hash[SHA256_HASH_SIZE]; ///< Decompressed .text segment SHA-256 checksum.
u8 rodata_segment_hash[SHA256_HASH_SIZE]; ///< Decompressed .rodata segment SHA-256 checksum.
u8 data_segment_hash[SHA256_HASH_SIZE]; ///< Decompressed .data segment SHA-256 checksum.
} NsoHeader;
NXDT_ASSERT(NsoHeader, 0x100);
/// Usually placed right after NsoHeader, but it's actual offset may vary.
/// 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.
typedef struct {
u8 name_length;
char name[];
} NsoModuleName;
NXDT_ASSERT(NsoModuleName, 0x1);
/// Placed at the very start of the decompressed .text segment.
typedef struct {
u32 entry_point;
u32 mod_offset; ///< NsoModHeader block offset (relative to the start of this header). Almost always set to 0x8 (the size of this struct).
} NsoModStart;
NXDT_ASSERT(NsoModStart, 0x8);
/// This is essentially a replacement for the PT_DYNAMIC program header available in ELF binaries.
/// All offsets are signed 32-bit values relative to the start of this header.
/// This is usually placed at the start of the decompressed .text segment, right after a NsoModStart block.
/// However, in some NSOs, it can instead be placed at the start of the decompressed .rodata segment, right after its NsoModuleInfo block.
/// In these cases, the 'mod_offset' value from the NsoModStart block will point to an offset within the .rodata segment.
typedef struct {
u32 magic; ///< "MOD0".
s32 dynamic_offset;
s32 bss_start_offset;
s32 bss_end_offset;
s32 eh_frame_hdr_start_offset;
s32 eh_frame_hdr_end_offset;
s32 module_object_offset; ///< Typically equal to bss_start_offset.
} NsoModHeader;
NXDT_ASSERT(NsoModHeader, 0x1C);
/// Placed at the start of the decompressed .rodata segment + 0x4.
/// If the 'name_length' element is greater than 0, 'name' will hold the module name.
typedef struct {
u32 name_length;
char name[];
} NsoModuleInfo;
NXDT_ASSERT(NsoModuleInfo, 0x4);
typedef struct {
PartitionFileSystemContext *pfs_ctx; ///< PartitionFileSystemContext for the Program NCA FS section #0, which is where this NSO is stored.
PartitionFileSystemEntry *pfs_entry; ///< PartitionFileSystemEntry for this NSO in the Program NCA FS section #0. Used to read NSO data.
char *nso_filename; ///< Pointer to the NSO filename in the Program NCA FS section #0.
NsoHeader nso_header; ///< NSO header.
char *module_name; ///< Pointer to a dynamically allocated buffer that holds the NSO module name, if available. Otherwise, this is set to NULL.
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.
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.
///< Middleware and GuidelineApi entries are retrieved from this section.
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'.
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.
u64 rodata_dynstr_section_size; ///< .rodata dynamic string section size. Kept here for convenience - this is part of 'nso_header'.
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.
u64 rodata_dynsym_section_size; ///< .rodata dynamic symbol section size. Kept here for convenience - this is part of 'nso_header'.
} NsoContext;
/// 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.
bool nsoInitializeContext(NsoContext *out, PartitionFileSystemContext *pfs_ctx, PartitionFileSystemEntry *pfs_entry);
/// Helper inline functions.
NX_INLINE void nsoFreeContext(NsoContext *nso_ctx)
{
if (!nso_ctx) return;
if (nso_ctx->module_name) free(nso_ctx->module_name);
if (nso_ctx->module_info_name) free(nso_ctx->module_info_name);
if (nso_ctx->rodata_api_info_section) free(nso_ctx->rodata_api_info_section);
if (nso_ctx->rodata_dynstr_section) free(nso_ctx->rodata_dynstr_section);
if (nso_ctx->rodata_dynsym_section) free(nso_ctx->rodata_dynsym_section);
memset(nso_ctx, 0, sizeof(NsoContext));
}
#ifdef __cplusplus
}
#endif
#endif /* __NSO_H__ */
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