mirror of https://github.com/acidanthera/audk.git
0ff5aa9cae
If Stack Guard is enabled and there's really a stack overflow happened during boot, a Page Fault exception will be triggered. Because the stack is out of usage, the exception handler, which shares the stack with normal UEFI driver, cannot be executed and cannot dump the processor information. Without those information, it's very difficult for the BIOS developers locate the root cause of stack overflow. And without a workable stack, the developer cannot event use single step to debug the UEFI driver with JTAG debugger. In order to make sure the exception handler to execute normally after stack overflow. We need separate stacks for exception handlers in case of unusable stack. IA processor allows to switch to a new stack during handling interrupt and exception. But X64 and IA32 provides different ways to make it. X64 provides interrupt stack table (IST) to allow maximum 7 different exceptions to have new stack for its handler. IA32 doesn't have IST mechanism and can only use task gate to do it since task switch allows to load a new stack through its task-state segment (TSS). The new API, InitializeCpuExceptionHandlersEx, is implemented to complete extra initialization for stack switch of exception handler. Since setting up stack switch needs allocating new memory for new stack, new GDT table and task-state segment but the initialization method will be called in different phases which have no consistent way to reserve those memory, this new API is allowed to pass the reserved resources to complete the extra works. This is cannot be done by original InitializeCpuExceptionHandlers. Considering exception handler initialization for MP situation, this new API is also necessary, because AP is not supposed to allocate memory. So the memory needed for stack switch have to be reserved in BSP before waking up AP and then pass them to InitializeCpuExceptionHandlersEx afterwards. Since Stack Guard feature is available only for DXE phase at this time, the new API is fully implemented for DXE only. Other phases implement a dummy one which just calls InitializeCpuExceptionHandlers(). Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Jeff Fan <vanjeff_919@hotmail.com> Reviewed-by: Jiewen.yao@intel.com |
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|---|---|---|
| AppPkg | ||
| ArmPkg | ||
| ArmPlatformPkg | ||
| ArmVirtPkg | ||
| BaseTools | ||
| BeagleBoardPkg | ||
| Conf | ||
| CorebootModulePkg | ||
| CorebootPayloadPkg | ||
| CryptoPkg | ||
| DuetPkg | ||
| EdkCompatibilityPkg | ||
| EdkShellBinPkg | ||
| EdkShellPkg | ||
| EmbeddedPkg | ||
| EmulatorPkg | ||
| FatBinPkg | ||
| FatPkg | ||
| IntelFrameworkModulePkg | ||
| IntelFrameworkPkg | ||
| IntelFsp2Pkg | ||
| IntelFsp2WrapperPkg | ||
| IntelFspPkg | ||
| IntelFspWrapperPkg | ||
| IntelSiliconPkg | ||
| MdeModulePkg | ||
| MdePkg | ||
| NetworkPkg | ||
| Nt32Pkg | ||
| Omap35xxPkg | ||
| OptionRomPkg | ||
| OvmfPkg | ||
| PcAtChipsetPkg | ||
| PerformancePkg | ||
| QuarkPlatformPkg | ||
| QuarkSocPkg | ||
| SecurityPkg | ||
| ShellBinPkg | ||
| ShellPkg | ||
| SignedCapsulePkg | ||
| SourceLevelDebugPkg | ||
| StdLib | ||
| StdLibPrivateInternalFiles | ||
| UefiCpuPkg | ||
| UnixPkg | ||
| Vlv2DeviceRefCodePkg | ||
| Vlv2TbltDevicePkg | ||
| .gitignore | ||
| BuildNotes2.txt | ||
| Contributions.txt | ||
| Edk2Setup.bat | ||
| License.txt | ||
| Maintainers.txt | ||
| Readme.md | ||
| edksetup.bat | ||
| edksetup.sh | ||
Readme.md
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.