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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 */
/**
* \def IPA_MODULE_API_VERSION
* \brief The IPA module API version
*
* This version number specifies the version for the layout of
* struct IPAModuleInfo. The IPA module shall use this macro to
* set its moduleAPIVersion field.
*
* \sa IPAModuleInfo::moduleAPIVersion
*/
/**
* \struct IPAModuleInfo
* \brief Information of an IPA module
*
* This structure contains the information of an IPA module. It is loaded,
* read, and validated before anything else is loaded from the shared object.
*
* \var IPAModuleInfo::moduleAPIVersion
* \brief The IPA module API version that the IPA module implements
*
* This version number specifies the version for the layout of
* struct IPAModuleInfo. The IPA module shall report here the version that
* it was built for, using the macro IPA_MODULE_API_VERSION.
*
* \var IPAModuleInfo::pipelineVersion
* \brief The pipeline handler version that the IPA module is for
*
* \var IPAModuleInfo::pipelineName
* \brief The name of the pipeline handler that the IPA module is for
*
* This name is used to match a pipeline handler with the module.
*
* \var IPAModuleInfo::name
* \brief The name of the IPA module
*
* The name may be used to build file system paths to IPA-specific resources.
* It shall only contain printable characters, and may not contain '/', '*',
* '?' or '\'. For IPA modules included in libcamera, it shall match the
* directory of the IPA module in the source tree.
*
* \todo Allow user to choose to isolate open source IPAs
*/
/**
* \var ipaModuleInfo
* \brief Information of an IPA module
*
* An IPA module must export a struct IPAModuleInfo of this name.
*/
/**
* \class IPAModule
* \brief Wrapper around IPA module shared object
*/
/**
* \brief Construct an IPAModule instance
* \param[in] libPath path to IPA module shared object
*
* Loads the IPAModuleInfo from the IPA module shared object at libPath.
* The IPA module shared object file must be of the same endianness and
* bitness as libcamera.
*
* The caller shall call the isValid() function after constructing an
* IPAModule instance to verify the validity of the IPAModule.
*/
IPAModule::IPAModule(const std::string &libPath)
: libPath_(libPath), valid_(false), loaded_(false),
dlHandle_(nullptr), ipaCreate_(nullptr)
{
if (loadIPAModuleInfo() < 0)
return;
valid_ = true;
}
IPAModule::~IPAModule()
{
if (dlHandle_)
dlclose(dlHandle_);
}
int IPAModule::loadIPAModuleInfo()
{
File file{ libPath_ };
if (!file.open(File::OpenModeFlag::ReadOnly)) {
LOG(IPAModule, Error) << "Failed to open IPA library: "
<< strerror(-file.error());
return file.error();
}
Span<const uint8_t> data = file.map();
int ret = elfVerifyIdent(data);
if (ret) {
LOG(IPAModule, Error) << "IPA module is not an ELF file";
return ret;
}
Span<const uint8_t> info = elfLoadSymbol(data, "ipaModuleInfo");
if (info.size() != sizeof(info_)) {
LOG(IPAModule, Error) << "IPA module has no valid info";
return -EINVAL;
}
memcpy(&info_, info.data(), info.size());
if (info_.moduleAPIVersion != IPA_MODULE_API_VERSION) {
LOG(IPAModule, Error) << "IPA module API version mismatch";
return -EINVAL;
}
/* Validate the IPA module name. */
std::string ipaName = info_.name;
auto iter = std::find_if_not(ipaName.begin(), ipaName.end(),
[](unsigned char c) -> bool {
return isprint(c) && c != '/' &&
c != '?' && c != '*' &&
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