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

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Keyword substitution: kv
Default branch: MAIN

Use the DWARF pseudo-register for the signal trampoline return address.

CFI: Saved RA needs to point to the PC slot in the ucontext_t.

Set up the CFI in a slightly more rational way.

Fix typo (thanks kamil@ for pointing it out).

Add call frame unwind info to the Alpha signal trampoline.  Using
kamil@'s test program:

Before:
Backtrace 2 stack frames.
0x120000a74 <handler+0x54> at ./test
0x3fffdca6550 <__sigtramp_siginfo_2> at /usr/lib/libc.so.12

After:
Backtrace 4 stack frames.
0x120000a74 <handler+0x54> at ./test
0x3fffdca6554 <__sigtramp_siginfo_2> at /usr/lib/libc.so.12
0x120000b10 <main+0x38> at ./test
0x1200009b4 <___start+0x1a4> at ./test

- Consistently use _REG_* defines from assym.h to mean register numbers,
  not offsets (i.e. *8 to get the offset).
- Define and use SIZEOF_SIGINFO and UC_GREGS constants, rather than
  hard-code magic numbers.

NFC -- same object code is generated.

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

Siginfo libc changes for alpha.  Approved by thorpej@netbsd.org.