[obish?sym;rfa:doc] Wire up vsyscall

[Andrew Cagney]

> At present I know of the following problems:

4.  backtrace changes:

#0  handler (sig=26, info=0xfeed7c50, context=0xfeed7cd0) at 
/home/cygnus/cagney
/PENDING/2004-05-06-add-vsyscall/src/gdb/testsuite/gdb.base/siginfo.c:31
#1  0x0093e440 in __kernel_sigreturn ()
#2  0x0804848a in main () at 
/home/cygnus/cagney/PENDING/2004-05-06-add-vsyscall
/src/gdb/testsuite/gdb.base/siginfo.c:66

vs

#0  handler (sig=26, info=0xfee1ea80, context=0xfee1eb00) at 
/home/cygnus/cagney
/GDB/src/gdb/testsuite/gdb.base/siginfo.c:31
#1  <signal handler called>
#2  0x0804848a in main () at 
/home/cygnus/cagney/GDB/src/gdb/testsuite/gdb.base/

but remember I intend changing the second to:

...
#1 0x1234 in <signal trampoline>
...

Andrew