Add initial support for SEH directives in x86_64 perlasm

This implements similar directives as MASM, so we do not need to build
all the structures by hand. It does not provide any help to abstract
between Win64 and SysV differences, however.

This is pulled together from some old draft CLs I had, one of which
actually synthesized CFI directives from SEH, so it should be possible.
I've intentionally omitted that however, as it also brings in questions
about how to handle the calling convention differences (the existing
machinery won't *quite* work). I've uploaded just this for now, so
review can focus on the basic mechanism.

I've also preserved perlasm's weird mixed tabs and spaces indentation
convention for now, though it is a bit tedious.

Bug: 259
Change-Id: Ib3f46a27751a5319b758d12c462c660cf9f3e632
Auto-Submit: David Benjamin <>
Reviewed-by: Adam Langley <>
Commit-Queue: Adam Langley <>
3 files changed
tree: 9bb48ad296a17c8b8c8d015201bee5508113e3c5
  1. .github/
  2. crypto/
  3. decrepit/
  4. fuzz/
  5. include/
  6. rust/
  7. ssl/
  8. third_party/
  9. tool/
  10. util/
  11. .clang-format
  12. .gitignore
  16. CMakeLists.txt
  17. codereview.settings
  20. go.mod
  21. go.sum
  24. OpenSSLConfig.cmake
  28. sources.cmake


BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

Project links:

There are other files in this directory which might be helpful: