llvm-project/llvm/tools/llvm-readobj
Prakhar Bahuguna 52a7dd7d78 [ARM] Implement execute-only support in CodeGen
This implements execute-only support for ARM code generation, which
prevents the compiler from generating data accesses to code sections.
The following changes are involved:

* Add the CodeGen option "-arm-execute-only" to the ARM code generator.
* Add the clang flag "-mexecute-only" as well as the GCC-compatible
  alias "-mpure-code" to enable this option.
* When enabled, literal pools are replaced with MOVW/MOVT instructions,
  with VMOV used in addition for floating-point literals. As the MOVT
  instruction is required, execute-only support is only available in
  Thumb mode for targets supporting ARMv8-M baseline or Thumb2.
* Jump tables are placed in data sections when in execute-only mode.
* The execute-only text section is assigned section ID 0, and is
  marked as unreadable with the SHF_ARM_PURECODE flag with symbol 'y'.
  This also overrides selection of ELF sections for globals.

llvm-svn: 289784
2016-12-15 07:59:08 +00:00
..
ARMAttributeParser.cpp Move llvm-readobj/StreamWriter to Support. 2016-05-03 00:28:04 +00:00
ARMAttributeParser.h Move llvm-readobj/StreamWriter to Support. 2016-05-03 00:28:04 +00:00
ARMEHABIPrinter.h [ELF] Convert ELF.h to Expected<T>. 2016-11-16 05:10:28 +00:00
ARMWinEHPrinter.cpp Thread Expected<...> up from libObject’s getSymbolAddress() for symbols to allow 2016-06-24 18:24:42 +00:00
ARMWinEHPrinter.h Move llvm-readobj/StreamWriter to Support. 2016-05-03 00:28:04 +00:00
CMakeLists.txt [msf] Resubmit "Rename Msf -> MSF". 2016-07-29 20:56:36 +00:00
COFFDumper.cpp [CodeView] Hook up CodeViewRecordIO to type serialization path. 2016-11-08 22:24:53 +00:00
COFFImportDumper.cpp llvm-readobj: Dump more info for COFF import libraries. 2015-08-28 10:27:50 +00:00
CodeView.h Silence gcc warning about ternary and enumerations 2016-01-28 23:59:35 +00:00
ELFDumper.cpp [ARM] Implement execute-only support in CodeGen 2016-12-15 07:59:08 +00:00
Error.cpp Remove LLVM_NOEXCEPT and replace it with noexcept 2016-10-19 23:52:38 +00:00
Error.h
LLVMBuild.txt [msf] Resubmit "Rename Msf -> MSF". 2016-07-29 20:56:36 +00:00
MachODumper.cpp [Stackmap] Added callsite counts to emitted function information. 2016-09-14 20:22:03 +00:00
ObjDumper.cpp Move llvm-readobj/StreamWriter to Support. 2016-05-03 00:28:04 +00:00
ObjDumper.h AMDGPU: Emit runtime metadata version 2 as YAML 2016-12-14 17:16:52 +00:00
StackMapPrinter.h [Stackmap] Added callsite counts to emitted function information. 2016-09-14 20:22:03 +00:00
Win64EHDumper.cpp Thread Expected<...> up from libObject’s getSymbolAddress() for symbols to allow 2016-06-24 18:24:42 +00:00
Win64EHDumper.h Move llvm-readobj/StreamWriter to Support. 2016-05-03 00:28:04 +00:00
llvm-readobj.cpp AMDGPU: Emit runtime metadata version 2 as YAML 2016-12-14 17:16:52 +00:00
llvm-readobj.h [CodeView] Decouple record deserialization from visitor dispatch. 2016-08-05 21:45:34 +00:00