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authorKieran Bingham <kieran.bingham@ideasonboard.com>2022-10-14 14:48:46 +0100
committerKieran Bingham <kieran.bingham@ideasonboard.com>2022-10-14 14:48:46 +0100
commita83aed77df1258e469c0eb42d9cb4f1938db53f2 (patch)
treeafadc2be7e16376c7a7a7d7925cc02886e24ac94 /src/android/camera_device.cpp
parentfc46d091231e22f47e2056fb854ddf4a999d606a (diff)
libcamera v0.0.1
This patch release commences the package release procedures for the project. Initial releases will include a bump to the patch (0.0.x) version number, as well as a corresponding increment to the soname. Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/android/camera_device.cpp')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.1 (git 2.18.0) at 2025-02-14 18:52:57 +0000
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * ipa_module.cpp - Image Processing Algorithm module
 */

#include "libcamera/internal/ipa_module.h"

#include <algorithm>
#include <array>
#include <ctype.h>
#include <dlfcn.h>
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <link.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <libcamera/base/file.h>
#include <libcamera/base/log.h>
#include <libcamera/base/span.h>
#include <libcamera/base/utils.h>

#include "libcamera/internal/pipeline_handler.h"

/**
 * \file ipa_module.h
 * \brief Image Processing Algorithm module
 */

/**
 * \file ipa_module_info.h
 * \brief Image Processing Algorithm module information
 */

namespace libcamera {

LOG_DEFINE_CATEGORY(IPAModule)

namespace {

template<typename T>
typename std::remove_extent_t<T> *elfPointer(Span<const uint8_t> elf,
					     off_t offset, size_t objSize)
{
	size_t size = offset + objSize;
	if (size > elf.size() || size < objSize)
		return nullptr;

	return reinterpret_cast<typename std::remove_extent_t<T> *>
		(reinterpret_cast<const char *>(elf.data()) + offset);
}

template<typename T>
typename std::remove_extent_t<T> *elfPointer(Span<const uint8_t> elf,
					     off_t offset)
{
	return elfPointer<T>(elf, offset, sizeof(T));
}

int elfVerifyIdent(Span<const uint8_t> elf)
{
	const char *e_ident = elfPointer<const char[EI_NIDENT]>(elf, 0);
	if (!e_ident)
		return -ENOEXEC;

	if (e_ident[EI_MAG0] != ELFMAG0 ||
	    e_ident[EI_MAG1] != ELFMAG1 ||
	    e_ident[EI_MAG2] != ELFMAG2 ||
	    e_ident[EI_MAG3] != ELFMAG3 ||
	    e_ident[EI_VERSION] != EV_CURRENT)
		return -ENOEXEC;

	int bitClass = sizeof(unsigned long) == 4 ? ELFCLASS32 : ELFCLASS64;
	if (e_ident[EI_CLASS] != bitClass)
		return -ENOEXEC;

	int a = 1;
	unsigned char endianness = *reinterpret_cast<char *>(&a) == 1
				 ? ELFDATA2LSB : ELFDATA2MSB;
	if (e_ident[EI_DATA] != endianness)
		return -ENOEXEC;

	return 0;
}

const ElfW(Shdr) *elfSection(Span<const uint8_t> elf, const ElfW(Ehdr) *eHdr,
			     ElfW(Half) idx)
{
	if (idx >= eHdr->e_shnum)
		return nullptr;

	off_t offset = eHdr->e_shoff + idx *
				       static_cast<uint32_t>(eHdr->e_shentsize);
	return elfPointer<const ElfW(Shdr)>(elf, offset);
}

/**
 * \brief Retrieve address and size of a symbol from an mmap'ed ELF file
 * \param[in] elf Address and size of mmap'ed ELF file
 * \param[in] symbol Symbol name
 *
 * \return The memory region storing the symbol on success, or an empty span
 * otherwise
 */
Span<const uint8_t> elfLoadSymbol(Span<const uint8_t> elf, const char *symbol)
{
	const ElfW(Ehdr) *eHdr = elfPointer<const ElfW(Ehdr)>(elf, 0);
	if (!eHdr)
		return {};

	const ElfW(Shdr) *sHdr = elfSection(elf, eHdr, eHdr->e_shstrndx);
	if (!sHdr)
		return {};
	off_t shnameoff = sHdr->sh_offset;

	/* Locate .dynsym section header. */
	const ElfW(Shdr) *dynsym = nullptr;
	for (unsigned int i = 0; i < eHdr->e_shnum; i++) {
		sHdr = elfSection(elf, eHdr, i);
		if (!sHdr)
			return {};

		off_t offset = shnameoff + sHdr->sh_name;
		const char *name = elfPointer<const char[8]>(elf, offset);
		if (!name)
			return {};

		if (sHdr->sh_type == SHT_DYNSYM && !strcmp(name, ".dynsym")) {
			dynsym = sHdr;
			break;
		}
	}

	if (dynsym == nullptr) {
		LOG(IPAModule, Error) << "ELF has no .dynsym section";
		return {};
	}

	sHdr = elfSection(elf, eHdr, dynsym->sh_link);
	if (!sHdr)
		return {};
	off_t dynsym_nameoff = sHdr->sh_offset;

	/* Locate symbol in the .dynsym section. */
	const ElfW(Sym) *targetSymbol = nullptr;
	unsigned int dynsym_num = dynsym->sh_size / dynsym->sh_entsize;
	for (unsigned int i = 0; i < dynsym_num; i++) {
		off_t offset = dynsym->sh_offset + dynsym->sh_entsize * i;
		const ElfW(Sym) *sym = elfPointer<const ElfW(Sym)>(elf, offset);
		if (!sym)
			return {};

		offset = dynsym_nameoff + sym->st_name;
		const char *name = elfPointer<const char>(elf, offset,
							  strlen(symbol) + 1);
		if (!name)
			return {};

		if (!strcmp(name, symbol) &&
		    sym->st_info & STB_GLOBAL) {
			targetSymbol = sym;
			break;
		}
	}

	if (targetSymbol == nullptr) {
		LOG(IPAModule, Error) << "Symbol " << symbol << " not found";
		return {};
	}

	/* Locate and return data of symbol. */
	sHdr = elfSection(elf, eHdr, targetSymbol->st_shndx);
	if (!sHdr)
		return {};
	off_t offset = sHdr->sh_offset + (targetSymbol->st_value - sHdr->sh_addr);
	const uint8_t *data = elfPointer<const uint8_t>(elf, offset,
							targetSymbol->st_size);
	if (!data)
		return {};

	return { data, targetSymbol->st_size };
}

} /* namespace */

/**