From 5c5cf2f8e000d1bf4fc12ff20351aa60367cb563 Mon Sep 17 00:00:00 2001 From: Yuri Kunde Schlesner Date: Thu, 9 Jul 2015 22:52:15 -0300 Subject: Core: Properly configure address space when loading a binary The code now properly configures the process image to match the loaded binary segments (code, rodata, data) instead of just blindly allocating a large chunk of dummy memory. --- src/core/loader/3dsx.cpp | 37 +++++++++++++++++----- src/core/loader/elf.cpp | 81 +++++++++++++++++++++++++++++++++++++++--------- src/core/loader/ncch.cpp | 32 ++++++++++++++++--- 3 files changed, 123 insertions(+), 27 deletions(-) (limited to 'src/core/loader') diff --git a/src/core/loader/3dsx.cpp b/src/core/loader/3dsx.cpp index e57d7274..05566136 100644 --- a/src/core/loader/3dsx.cpp +++ b/src/core/loader/3dsx.cpp @@ -101,7 +101,10 @@ static u32 TranslateAddr(u32 addr, const THREEloadinfo *loadinfo, u32* offsets) return loadinfo->seg_addrs[2] + addr - offsets[1]; } -static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr) +using Kernel::SharedPtr; +using Kernel::CodeSet; + +static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr, SharedPtr* out_codeset) { if (!file.IsOpen()) return ERROR_FILE; @@ -201,13 +204,29 @@ static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr) } } - // Write the data - memcpy(Memory::GetPointer(base_addr), program_image.data(), program_image.size()); + // Create the CodeSet + SharedPtr code_set = CodeSet::Create("", 0); + + code_set->code.offset = loadinfo.seg_ptrs[0] - program_image.data(); + code_set->code.addr = loadinfo.seg_addrs[0]; + code_set->code.size = loadinfo.seg_sizes[0]; + + code_set->rodata.offset = loadinfo.seg_ptrs[1] - program_image.data(); + code_set->rodata.addr = loadinfo.seg_addrs[1]; + code_set->rodata.size = loadinfo.seg_sizes[1]; + + code_set->data.offset = loadinfo.seg_ptrs[2] - program_image.data(); + code_set->data.addr = loadinfo.seg_addrs[2]; + code_set->data.size = loadinfo.seg_sizes[2]; + + code_set->entrypoint = code_set->code.addr; + code_set->memory = std::make_shared>(std::move(program_image)); LOG_DEBUG(Loader, "code size: 0x%X", loadinfo.seg_sizes[0]); LOG_DEBUG(Loader, "rodata size: 0x%X", loadinfo.seg_sizes[1]); LOG_DEBUG(Loader, "data size: 0x%X (including 0x%X of bss)", loadinfo.seg_sizes[2], hdr.bss_size); + *out_codeset = code_set; return ERROR_NONE; } @@ -230,17 +249,19 @@ ResultStatus AppLoader_THREEDSX::Load() { if (!file->IsOpen()) return ResultStatus::Error; - Kernel::g_current_process = Kernel::Process::Create(filename, 0); + SharedPtr codeset; + if (Load3DSXFile(*file, Memory::PROCESS_IMAGE_VADDR, &codeset) != ERROR_NONE) + return ResultStatus::Error; + 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); - if (Load3DSXFile(*file, Memory::PROCESS_IMAGE_VADDR) != ERROR_NONE) - return ResultStatus::Error; - - Kernel::g_current_process->Run(Memory::PROCESS_IMAGE_VADDR, 48, Kernel::DEFAULT_STACK_SIZE); + Kernel::g_current_process->Run(48, Kernel::DEFAULT_STACK_SIZE); is_loaded = true; return ResultStatus::Success; diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp index a7eea78a..ca3c18a9 100644 --- a/src/core/loader/elf.cpp +++ b/src/core/loader/elf.cpp @@ -16,6 +16,9 @@ #include "core/loader/elf.h" #include "core/memory.h" +using Kernel::SharedPtr; +using Kernel::CodeSet; + //////////////////////////////////////////////////////////////////////////////////////////////////// // ELF Header Constants @@ -97,6 +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; @@ -193,7 +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 LoadInto(u32 vaddr); bool LoadSymbols(); int GetNumSegments() const { return (int)(header->e_phnum); } @@ -249,7 +258,7 @@ const char *ElfReader::GetSectionName(int section) const { return nullptr; } -void ElfReader::LoadInto(u32 vaddr) { +SharedPtr ElfReader::LoadInto(u32 vaddr) { LOG_DEBUG(Loader, "String section: %i", header->e_shstrndx); // Should we relocate? @@ -267,19 +276,61 @@ void ElfReader::LoadInto(u32 vaddr) { 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 program_image(total_image_size); + size_t current_image_position = 0; + + SharedPtr 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::move(program_image)); + LOG_DEBUG(Loader, "Done loading."); + + return codeset; } SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const { @@ -352,18 +403,18 @@ ResultStatus AppLoader_ELF::Load() { 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 = 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; diff --git a/src/core/loader/ncch.cpp b/src/core/loader/ncch.cpp index 2b26b31c..87603d19 100644 --- a/src/core/loader/ncch.cpp +++ b/src/core/loader/ncch.cpp @@ -118,6 +118,9 @@ FileType AppLoader_NCCH::IdentifyType(FileUtil::IOFile& file) { } ResultStatus AppLoader_NCCH::LoadExec() const { + using Kernel::SharedPtr; + using Kernel::CodeSet; + if (!is_loaded) return ResultStatus::ErrorNotLoaded; @@ -126,7 +129,30 @@ ResultStatus AppLoader_NCCH::LoadExec() const { std::string process_name = Common::StringFromFixedZeroTerminatedBuffer( (const char*)exheader_header.codeset_info.name, 8); u64 program_id = *reinterpret_cast(&ncch_header.program_id[0]); - Kernel::g_current_process = Kernel::Process::Create(process_name, program_id); + + SharedPtr codeset = CodeSet::Create(process_name, program_id); + + codeset->code.offset = 0; + codeset->code.addr = exheader_header.codeset_info.text.address; + codeset->code.size = exheader_header.codeset_info.text.num_max_pages * Memory::PAGE_SIZE; + + codeset->rodata.offset = codeset->code.offset + codeset->code.size; + codeset->rodata.addr = exheader_header.codeset_info.ro.address; + codeset->rodata.size = exheader_header.codeset_info.ro.num_max_pages * Memory::PAGE_SIZE; + + // TODO(yuriks): Not sure if the bss size is added to the page-aligned .data size or just + // to the regular size. Playing it safe for now. + u32 bss_page_size = (exheader_header.codeset_info.bss_size + 0xFFF) & ~0xFFF; + code.resize(code.size() + bss_page_size, 0); + + codeset->data.offset = codeset->rodata.offset + codeset->rodata.size; + codeset->data.addr = exheader_header.codeset_info.data.address; + codeset->data.size = exheader_header.codeset_info.data.num_max_pages * Memory::PAGE_SIZE + bss_page_size; + + codeset->entrypoint = codeset->code.addr; + codeset->memory = std::make_shared>(std::move(code)); + + Kernel::g_current_process = Kernel::Process::Create(std::move(codeset)); // Attach a resource limit to the process based on the resource limit category Kernel::g_current_process->resource_limit = Kernel::ResourceLimit::GetForCategory( @@ -137,11 +163,9 @@ ResultStatus AppLoader_NCCH::LoadExec() const { std::copy_n(exheader_header.arm11_kernel_caps.descriptors, kernel_caps.size(), begin(kernel_caps)); Kernel::g_current_process->ParseKernelCaps(kernel_caps.data(), kernel_caps.size()); - Memory::WriteBlock(entry_point, &code[0], code.size()); - s32 priority = exheader_header.arm11_system_local_caps.priority; u32 stack_size = exheader_header.codeset_info.stack_size; - Kernel::g_current_process->Run(entry_point, priority, stack_size); + Kernel::g_current_process->Run(priority, stack_size); return ResultStatus::Success; } return ResultStatus::Error; -- cgit v1.2.3