[release/8.0] Fix compilation of runtime with Xcode 16 (#112208)

* Add missing .alt_entry to CoreCLR *_FakeProlog methods

* Use .alt_entry on Apple platforms

* Remove explicit __compact_unwind entries from x64 assembler

Author: filipnavara

src/coreclr/nativeaot/Runtime/unix/unixasmmacrosamd64.inc

@@ -16,15 +16,6 @@
 
 .macro NESTED_END Name, Section
         LEAF_END \Name, \Section
-#if defined(__APPLE__)
-        .set LOCAL_LABEL(\Name\()_Size), . - C_FUNC(\Name)
-        .section __LD,__compact_unwind,regular,debug
-        .quad C_FUNC(\Name)
-        .long LOCAL_LABEL(\Name\()_Size)
-        .long 0x04000000 # DWARF
-        .quad 0
-        .quad 0
-#endif
 .endm
 
 .macro PATCH_LABEL Name
@@ -33,7 +24,12 @@ C_FUNC(\Name):
 .endm
 
 .macro ALTERNATE_ENTRY Name
+#if defined(__APPLE__)
+        .alt_entry C_FUNC(\Name)
+        .private_extern C_FUNC(\Name)
+#else
         .global C_FUNC(\Name)
+#endif
 C_FUNC(\Name):
 .endm
 

src/coreclr/nativeaot/Runtime/unix/unixasmmacrosarm64.inc

@@ -24,8 +24,11 @@ C_FUNC(\Name):
 .endm
 
 .macro ALTERNATE_ENTRY Name
+#if defined(__APPLE__)
+        .alt_entry C_FUNC(\Name)
+        .private_extern C_FUNC(\Name)
+#else
         .global C_FUNC(\Name)
-#if !defined(__APPLE__)
         .hidden C_FUNC(\Name)
 #endif
 C_FUNC(\Name):

src/coreclr/pal/inc/unixasmmacrosamd64.inc

@@ -14,15 +14,6 @@
 
 .macro NESTED_END Name, Section
         LEAF_END \Name, \Section
-#if defined(__APPLE__)
-        .set LOCAL_LABEL(\Name\()_Size), . - C_FUNC(\Name)
-        .section __LD,__compact_unwind,regular,debug
-        .quad C_FUNC(\Name)
-        .long LOCAL_LABEL(\Name\()_Size)
-        .long 0x04000000 # DWARF
-        .quad 0
-        .quad 0
-#endif
 .endm
 
 .macro PATCH_LABEL Name

src/coreclr/pal/inc/unixasmmacrosarm64.inc

@@ -17,7 +17,12 @@
 .endm
 
 .macro PATCH_LABEL Name
+#if defined(__APPLE__)
+        .alt_entry C_FUNC(\Name)
+        .private_extern C_FUNC(\Name)
+#else
         .global C_FUNC(\Name)
+#endif
 C_FUNC(\Name):
 .endm
 

src/coreclr/vm/arm64/asmhelpers.S

@@ -169,8 +169,7 @@ NESTED_END ThePreStub, _TEXT
 
 LEAF_ENTRY ThePreStubPatch, _TEXT
     nop
-.globl C_FUNC(ThePreStubPatchLabel)
-C_FUNC(ThePreStubPatchLabel):
+PATCH_LABEL ThePreStubPatchLabel
     ret lr
 LEAF_END ThePreStubPatch, _TEXT
 
@@ -818,8 +817,12 @@ NESTED_END ResolveWorkerAsmStub, _TEXT
 #ifdef FEATURE_READYTORUN
 
 NESTED_ENTRY DelayLoad_MethodCall_FakeProlog, _TEXT, NoHandler
-C_FUNC(DelayLoad_MethodCall):
+#if defined(__APPLE__)
+    .alt_entry C_FUNC(DelayLoad_MethodCall)
+#endif
     .global C_FUNC(DelayLoad_MethodCall)
+C_FUNC(DelayLoad_MethodCall):
+
     PROLOG_WITH_TRANSITION_BLOCK
 
     add x0, sp, #__PWTB_TransitionBlock // pTransitionBlock
@@ -838,8 +841,11 @@ NESTED_END DelayLoad_MethodCall_FakeProlog, _TEXT
 
 .macro DynamicHelper frameFlags, suffix
 NESTED_ENTRY DelayLoad_Helper\suffix\()_FakeProlog, _TEXT, NoHandler
-C_FUNC(DelayLoad_Helper\suffix):
+#if defined(__APPLE__)
+    .alt_entry C_FUNC(DelayLoad_Helper\suffix)
+#endif
     .global C_FUNC(DelayLoad_Helper\suffix)
+C_FUNC(DelayLoad_Helper\suffix):
 
     PROLOG_WITH_TRANSITION_BLOCK