CVS log for src/lib/libc/arch/x86_64/sys/__sigtramp2.S

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Default branch: MAIN

Restore RSP from mcontext

Fixes unwinding of multiple frames without base pointer.

Patch by: Nikhil Benesch via PR lib/55719

Decorate the x86_64 signal trampoline with CFI attributes easing unwinding

Combine the approach provided by Nikhil Benesch and Andrew Cagney.

Now, the unwinders (in gccgo, backtrace(3), etc) can unwind properly
the stack from a signal handler.

Fixes lib/55719 by Nikhil Benesch

Merge changes from current as of 20200406

Add cfi annotations so that gdb can unwind the stack through signal handlers.

Rebase to HEAD as of a few days ago.

Rebase.

Put missing END() markers to set ELF symbol size.

if setcontext(2) returns, _exit(2) with a return code of -1 instead
of relying on a sensible return value

replace the last occurence of an "int 0x80" syscall

Use the int 0x80 path for context system calls.

Get ucontext pointer back out of callee-saved register %r15.

Userland amd64 siginfo support.