[SystemZ][z/OS] Initial code to generate assembly files on z/OS

- This patch consists of the bare basic code needed in order to generate some assembly for the z/OS target.
- Only the .text and the .bss sections are added for now.
- The relevant MCSectionGOFF/Symbol interfaces have been added. This enables us to print out the GOFF machine code sections.
- This patch enables us to add simple lit tests wherever possible, and contribute to the testing coverage for the z/OS target
- Further improvements and additions will be made in future patches.

Reviewed By: tmatheson

Differential Revision: https://reviews.llvm.org/D106380

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCObjectFileInfo.cpp b/llvm/lib/MC/MCObjectFileInfo.cpp
index 1a448f0..7ea1106 100644
--- a/llvm/lib/MC/MCObjectFileInfo.cpp
+++ b/llvm/lib/MC/MCObjectFileInfo.cpp
@@ -17,6 +17,7 @@
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSectionCOFF.h"
 #include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionGOFF.h"
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/MC/MCSectionWasm.h"
 #include "llvm/MC/MCSectionXCOFF.h"
@@ -504,6 +505,11 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
       Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0);
 }
 
+void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) {
+  TextSection = Ctx->getGOFFSection(".text", SectionKind::getText());
+  BSSSection = Ctx->getGOFFSection(".bss", SectionKind::getBSS());
+}
+
 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
   EHFrameSection =
       Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
@@ -995,6 +1001,9 @@ void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC,
   case MCContext::IsELF:
     initELFMCObjectFileInfo(TheTriple, LargeCodeModel);
     break;
+  case MCContext::IsGOFF:
+    initGOFFMCObjectFileInfo(TheTriple);
+    break;
   case MCContext::IsWasm:
     initWasmMCObjectFileInfo(TheTriple);
     break;