[llvm-bugs] [Bug 47463] New: [Windows][AArch64] setjmp/longjmp crashes with /guard:cf

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47463

            Bug ID: 47463
           Summary: [Windows][AArch64] setjmp/longjmp crashes with
                    /guard:cf
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: COFF
          Assignee: unassignedbugs at nondot.org
          Reporter: Richard.Townsend at arm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 23936
  --> https://bugs.llvm.org/attachment.cgi?id=23936&action=edit
Example program

When compiling the attached sample program (sample.c) in the following way from
an ARM64 cross-tools terminal:

clang-cl -o test-clang.obj -c sample.c /guard:cf --target=aarch64-windows /Z7
lld-link test-clang.obj /guard:cf -debug /out:test-clang-lld.exe
link test-clang.obj /guard:cf /out:test-clang-link.exe

The resulting binary (test-clang-lld.exe) terminates with a control flow guard
exception like the following:

EXCEPTION_RECORD:  (.exr -1)
ExceptionAddress: 00007fff7a8337c8 (ntdll!RtlFailFast2)
   ExceptionCode: c0000409 (Security check failure or stack buffer overrun)
  ExceptionFlags: 00000001
NumberParameters: 1
   Parameter[0]: 0000000000000026
Subcode: 0x26 FAST_FAIL_INVALID_LONGJUMP_TARGET

When linked with the Microsoft linker, everything works as expected. 

Possible follow on to https://bugs.llvm.org/show_bug.cgi?id=40057

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