diff options
Diffstat (limited to 'src/core/loader/elf.cpp')
| -rw-r--r-- | src/core/loader/elf.cpp | 93 |
1 files changed, 72 insertions, 21 deletions
diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp index f00753a7..5d7264f1 100644 --- a/src/core/loader/elf.cpp +++ b/src/core/loader/elf.cpp @@ -2,6 +2,7 @@ // Licensed under GPLv2 or any later version // Refer to the license.txt file included. +#include <cstring> #include <string> #include <memory> @@ -10,11 +11,14 @@ #include "common/logging/log.h" #include "common/symbols.h" -#include "core/hle/kernel/kernel.h" +#include "core/hle/kernel/process.h" #include "core/hle/kernel/resource_limit.h" #include "core/loader/elf.h" #include "core/memory.h" +using Kernel::SharedPtr; +using Kernel::CodeSet; + //////////////////////////////////////////////////////////////////////////////////////////////////// // ELF Header Constants @@ -96,6 +100,12 @@ enum ElfSectionFlags #define PT_LOPROC 0x70000000 #define PT_HIPROC 0x7FFFFFFF +// Segment flags +#define PF_X 0x1 +#define PF_W 0x2 +#define PF_R 0x4 +#define PF_MASKPROC 0xF0000000 + typedef unsigned int Elf32_Addr; typedef unsigned short Elf32_Half; typedef unsigned int Elf32_Off; @@ -192,7 +202,7 @@ public: ElfMachine GetMachine() const { return (ElfMachine)(header->e_machine); } u32 GetEntryPoint() const { return entryPoint; } u32 GetFlags() const { return (u32)(header->e_flags); } - void LoadInto(u32 vaddr); + SharedPtr<CodeSet> LoadInto(u32 vaddr); bool LoadSymbols(); int GetNumSegments() const { return (int)(header->e_phnum); } @@ -248,7 +258,7 @@ const char *ElfReader::GetSectionName(int section) const { return nullptr; } -void ElfReader::LoadInto(u32 vaddr) { +SharedPtr<CodeSet> ElfReader::LoadInto(u32 vaddr) { LOG_DEBUG(Loader, "String section: %i", header->e_shstrndx); // Should we relocate? @@ -263,22 +273,63 @@ void ElfReader::LoadInto(u32 vaddr) { LOG_DEBUG(Loader, "%i segments:", header->e_phnum); // First pass : Get the bits into RAM - u32 segment_addr[32]; u32 base_addr = relocate ? vaddr : 0; - for (unsigned i = 0; i < header->e_phnum; i++) { - Elf32_Phdr* p = segments + i; - LOG_DEBUG(Loader, "Type: %i Vaddr: %08x Filesz: %i Memsz: %i ", p->p_type, p->p_vaddr, + u32 total_image_size = 0; + for (unsigned int i = 0; i < header->e_phnum; ++i) { + Elf32_Phdr* p = &segments[i]; + if (p->p_type == PT_LOAD) { + total_image_size += (p->p_memsz + 0xFFF) & ~0xFFF; + } + } + + std::vector<u8> program_image(total_image_size); + size_t current_image_position = 0; + + SharedPtr<CodeSet> codeset = CodeSet::Create("", 0); + + for (unsigned int i = 0; i < header->e_phnum; ++i) { + Elf32_Phdr* p = &segments[i]; + LOG_DEBUG(Loader, "Type: %i Vaddr: %08X Filesz: %8X Memsz: %8X ", p->p_type, p->p_vaddr, p->p_filesz, p->p_memsz); if (p->p_type == PT_LOAD) { - segment_addr[i] = base_addr + p->p_vaddr; - memcpy(Memory::GetPointer(segment_addr[i]), GetSegmentPtr(i), p->p_filesz); - LOG_DEBUG(Loader, "Loadable Segment Copied to %08x, size %08x", segment_addr[i], - p->p_memsz); + CodeSet::Segment* codeset_segment; + u32 permission_flags = p->p_flags & (PF_R | PF_W | PF_X); + if (permission_flags == (PF_R | PF_X)) { + codeset_segment = &codeset->code; + } else if (permission_flags == (PF_R)) { + codeset_segment = &codeset->rodata; + } else if (permission_flags == (PF_R | PF_W)) { + codeset_segment = &codeset->data; + } else { + LOG_ERROR(Loader, "Unexpected ELF PT_LOAD segment id %u with flags %X", i, p->p_flags); + continue; + } + + if (codeset_segment->size != 0) { + LOG_ERROR(Loader, "ELF has more than one segment of the same type. Skipping extra segment (id %i)", i); + continue; + } + + u32 segment_addr = base_addr + p->p_vaddr; + u32 aligned_size = (p->p_memsz + 0xFFF) & ~0xFFF; + + codeset_segment->offset = current_image_position; + codeset_segment->addr = segment_addr; + codeset_segment->size = aligned_size; + + memcpy(&program_image[current_image_position], GetSegmentPtr(i), p->p_filesz); + current_image_position += aligned_size; } } + + codeset->entrypoint = base_addr + header->e_entry; + codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image)); + LOG_DEBUG(Loader, "Done loading."); + + return codeset; } SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const { @@ -340,29 +391,29 @@ ResultStatus AppLoader_ELF::Load() { if (is_loaded) return ResultStatus::ErrorAlreadyLoaded; - if (!file->IsOpen()) + if (!file.IsOpen()) return ResultStatus::Error; // Reset read pointer in case this file has been read before. - file->Seek(0, SEEK_SET); + file.Seek(0, SEEK_SET); - u32 size = static_cast<u32>(file->GetSize()); + size_t size = file.GetSize(); std::unique_ptr<u8[]> buffer(new u8[size]); - if (file->ReadBytes(&buffer[0], size) != size) + if (file.ReadBytes(&buffer[0], size) != size) return ResultStatus::Error; - Kernel::g_current_process = Kernel::Process::Create(filename, 0); + ElfReader elf_reader(&buffer[0]); + SharedPtr<CodeSet> codeset = elf_reader.LoadInto(Memory::PROCESS_IMAGE_VADDR); + codeset->name = filename; + + Kernel::g_current_process = Kernel::Process::Create(std::move(codeset)); Kernel::g_current_process->svc_access_mask.set(); Kernel::g_current_process->address_mappings = default_address_mappings; // Attach the default resource limit (APPLICATION) to the process Kernel::g_current_process->resource_limit = Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION); - ElfReader elf_reader(&buffer[0]); - elf_reader.LoadInto(Memory::PROCESS_IMAGE_VADDR); - // TODO: Fill application title - - Kernel::g_current_process->Run(elf_reader.GetEntryPoint(), 48, Kernel::DEFAULT_STACK_SIZE); + Kernel::g_current_process->Run(48, Kernel::DEFAULT_STACK_SIZE); is_loaded = true; return ResultStatus::Success; |