[cheriot] Do not treat setjmp/longjmp builtins as cherilibcallcc.

Author: resistor

clang/lib/AST/ASTContext.cpp

@@ -11856,10 +11856,11 @@ QualType ASTContext::GetBuiltinType(unsigned Id,
          "'.' should only occur at end of builtin type list!");
 
   bool Variadic = (TypeStr[0] == '.');
-
+  bool IsCheriLibcall = Id != Builtin::BIsetjmp && Id != Builtin::BIlongjmp;
+  IsCheriLibcall &= Target->getTargetOpts().ABI != "cheriot-baremetal";
   FunctionType::ExtInfo EI(getDefaultCallingConvention(
       Variadic, /*IsCXXMethod=*/false, /*IsBuiltin=*/true,
-      /*IsLibcall*/ Target->getTargetOpts().ABI != "cheriot-baremetal"));
+      /*IsLibcall*/ IsCheriLibcall));
   if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true);
 
 

clang/test/CodeGen/cheri/riscv/cheriot-setjmp.c

@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 %s -o - "-triple" "riscv32cheriot-unknown-unknown" "-emit-llvm" "-mframe-pointer=none" "-mcmodel=small" "-target-abi" "cheriot" "-Oz" "-Werror" -std=c2x | FileCheck %s
+// Verify that setjmp is called without cherilibcallcc
+struct __jmp_buf
+{
+	unsigned __cs0;
+	unsigned __cs1;
+	unsigned __csp;
+	unsigned __cra;
+};
+
+typedef struct __jmp_buf jmp_buf[1];
+
+__attribute__((returns_twice)) int setjmp(jmp_buf env) __asm__("setjmp");
+
+jmp_buf buf;
+
+// CHECK-LABEL: @test
+// CHECK: call i32 @setjmp
+void test() {
+    setjmp(buf);
+}