diff --git a/llvm/test/MC/AsmParser/debug-empty-source.s b/llvm/test/MC/AsmParser/debug-empty-source.s
--- a/llvm/test/MC/AsmParser/debug-empty-source.s
+++ b/llvm/test/MC/AsmParser/debug-empty-source.s
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos
 // REQUIRES: default_triple
 // RUN: llvm-mc %s -o -| FileCheck %s
 
diff --git a/llvm/test/MC/AsmParser/debug-no-source.s b/llvm/test/MC/AsmParser/debug-no-source.s
--- a/llvm/test/MC/AsmParser/debug-no-source.s
+++ b/llvm/test/MC/AsmParser/debug-no-source.s
@@ -1,3 +1,4 @@
+// UNSUPPORTED: -zos
 // REQUIRES: default_triple
 // RUN: llvm-mc %s | FileCheck %s
 
diff --git a/llvm/test/MC/AsmParser/include.ll b/llvm/test/MC/AsmParser/include.ll
--- a/llvm/test/MC/AsmParser/include.ll
+++ b/llvm/test/MC/AsmParser/include.ll
@@ -1,4 +1,5 @@
 ; RUN: llc -I %p/Inputs -filetype asm -o - %s | FileCheck %s
+; UNSUPPORTED: -zos
 ; REQUIRES: default_triple
 
 module asm ".include \22module.x\22"
diff --git a/llvm/test/MC/AsmParser/macro-same-context.ll b/llvm/test/MC/AsmParser/macro-same-context.ll
--- a/llvm/test/MC/AsmParser/macro-same-context.ll
+++ b/llvm/test/MC/AsmParser/macro-same-context.ll
@@ -1,5 +1,6 @@
 ;; Test that macros in inline assembly blocks share the same context,
 ;; thus a definition is available to the whole file. PR36110
+; UNSUPPORTED: -zos
 ; RUN: not llc < %s 2>&1 | FileCheck %s
 ; REQUIRES: default_triple
 ;; This test is expected to fail on AIX,
diff --git a/llvm/test/MC/ELF/dwarf-file0.s b/llvm/test/MC/ELF/dwarf-file0.s
--- a/llvm/test/MC/ELF/dwarf-file0.s
+++ b/llvm/test/MC/ELF/dwarf-file0.s
@@ -1,3 +1,4 @@
+# UNSUPPORTED: -zos
 # REQUIRES: default_triple
 # RUN: llvm-mc -dwarf-version 4 %s -filetype=obj -o - | llvm-dwarfdump -debug-line - | FileCheck %s
 # RUN: llvm-mc -dwarf-version 4 %s --fatal-warnings -o - | FileCheck %s --check-prefix=ASM
diff --git a/llvm/test/MC/ELF/dwarf-loc0.s b/llvm/test/MC/ELF/dwarf-loc0.s
--- a/llvm/test/MC/ELF/dwarf-loc0.s
+++ b/llvm/test/MC/ELF/dwarf-loc0.s
@@ -1,3 +1,4 @@
+# UNSUPPORTED: -zos
 # REQUIRES: default_triple
 # RUN: llvm-mc -dwarf-version 5 --defsym FILE0=1 %s -filetype=obj -o - | llvm-dwarfdump -debug-line - | FileCheck %s
 # RUN: not llvm-mc -dwarf-version 4 %s -filetype=asm -o - 2>&1 | FileCheck %s -check-prefix=ERR
diff --git a/llvm/test/tools/llvm-mc/no_warnings.test b/llvm/test/tools/llvm-mc/no_warnings.test
--- a/llvm/test/tools/llvm-mc/no_warnings.test
+++ b/llvm/test/tools/llvm-mc/no_warnings.test
@@ -1,3 +1,4 @@
+# UNSUPPORTED: -zos
 # RUN: llvm-mc --no-warn %s 2>&1 | FileCheck %s
 
 # CHECK-NOT: warning: