[lld] [lld] Add target support for SystemZ (s390x) (PR #75643)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff 59f7f35a9047cccded7b8d3a01926e03f1e10efa b02fb3abb3a808bb432790524a8c04b579fba5d7 -- lld/ELF/Arch/SystemZ.cpp lld/ELF/Driver.cpp lld/ELF/InputFiles.cpp lld/ELF/InputSection.cpp lld/ELF/Relocations.cpp lld/ELF/Relocations.h lld/ELF/ScriptParser.cpp lld/ELF/SyntheticSections.cpp lld/ELF/Target.cpp lld/ELF/Target.h
``````````

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/lld/ELF/Arch/SystemZ.cpp b/lld/ELF/Arch/SystemZ.cpp
index 80a65cf32b..b170344170 100644
--- a/lld/ELF/Arch/SystemZ.cpp
+++ b/lld/ELF/Arch/SystemZ.cpp
@@ -41,6 +41,7 @@ public:
   void relocate(uint8_t *loc, const Relocation &rel,
                 uint64_t val) const override;
   int64_t getImplicitAddend(const uint8_t *buf, RelType type) const override;
+
 private:
   void relaxGot(uint8_t *loc, const Relocation &rel, uint64_t val) const;
   void relaxTlsGdToIe(uint8_t *loc, const Relocation &rel, uint64_t val) const;
@@ -279,9 +280,9 @@ void SystemZ::relaxTlsGdToIe(uint8_t *loc, const Relocation &rel,
   // ear %rX,%a0
   // sllg %rX,%rX,32
   // ear %rX,%a1
-  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL            _GLOBAL_OFFSET_TABLE_
-  // lgrl %r2,.LC0                    R_390_PC32DBL             .LC0
-  // brasl %r14,__tls_get_offset at plt  R_390_TLS_GDCALL          x
+  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL _GLOBAL_OFFSET_TABLE_ lgrl
+  // %r2,.LC0                    R_390_PC32DBL             .LC0 brasl
+  // %r14,__tls_get_offset at plt  R_390_TLS_GDCALL          x
   //            :tls_gdcall:x         R_390_PLT32DBL            __tls_get_offset
   // la %r2,0(%r2,%rX)
   //
@@ -315,9 +316,9 @@ void SystemZ::relaxTlsGdToLe(uint8_t *loc, const Relocation &rel,
   // ear %rX,%a0
   // sllg %rX,%rX,32
   // ear %rX,%a1
-  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL            _GLOBAL_OFFSET_TABLE_
-  // lgrl %r2,.LC0                    R_390_PC32DBL             .LC0
-  // brasl %r14,__tls_get_offset at plt  R_390_TLS_GDCALL          x
+  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL _GLOBAL_OFFSET_TABLE_ lgrl
+  // %r2,.LC0                    R_390_PC32DBL             .LC0 brasl
+  // %r14,__tls_get_offset at plt  R_390_TLS_GDCALL          x
   //            :tls_gdcall:x         R_390_PLT32DBL            __tls_get_offset
   // la %r2,0(%r2,%rX)
   //
@@ -351,9 +352,9 @@ void SystemZ::relaxTlsLdToLe(uint8_t *loc, const Relocation &rel,
   // ear %rX,%a0
   // sllg %rX,%rX,32
   // ear %rX,%a1
-  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL            _GLOBAL_OFFSET_TABLE_
-  // lgrl %r2,.LC0                    R_390_PC32DBL             .LC0
-  // brasl %r14,__tls_get_offset at plt  R_390_TLS_LDCALL          <sym>
+  // larl %r12,_GLOBAL_OFFSET_TABLE_  R_390_GOTPCDBL _GLOBAL_OFFSET_TABLE_ lgrl
+  // %r2,.LC0                    R_390_PC32DBL             .LC0 brasl
+  // %r14,__tls_get_offset at plt  R_390_TLS_LDCALL          <sym>
   //            :tls_ldcall:<sym>     R_390_PLT32DBL            __tls_get_offset
   // la %r2,0(%r2,%rX)
   // lgrl %rY,.LC1                    R_390_PC32DBL             .LC1
@@ -451,7 +452,8 @@ void SystemZ::relaxGot(uint8_t *loc, const Relocation &rel,
   }
 }
 
-void SystemZ::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
+void SystemZ::relocate(uint8_t *loc, const Relocation &rel,
+                       uint64_t val) const {
   switch (rel.expr) {
   case R_RELAX_GOT_PC:
     return relaxGot(loc, rel, val);
@@ -505,8 +507,8 @@ void SystemZ::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const
   case R_390_GOTPLT20:
   case R_390_TLS_GOTIE20:
     checkInt(loc, val, 20, rel);
-    write32be(loc, (read32be(loc) & 0xF00000FF)
-		   | ((val & 0xFFF) << 16) | ((val & 0xFF000) >> 4));
+    write32be(loc, (read32be(loc) & 0xF00000FF) | ((val & 0xFFF) << 16) |
+                       ((val & 0xFF000) >> 4));
     break;
   case R_390_PC24DBL:
   case R_390_PLT24DBL:
@@ -568,7 +570,8 @@ void SystemZ::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const
   case R_390_TLS_LDCALL:
     break;
   default:
-    error(getErrorLocation(loc) + "unknown relocation (" + Twine(rel.type) + ")");
+    error(getErrorLocation(loc) + "unknown relocation (" + Twine(rel.type) +
+          ")");
     llvm_unreachable("unknown relocation");
   }
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/75643