K 10
svn:author
V 6
marcel
K 8
svn:date
V 27
2003-11-11T09:25:19.000000Z
K 7
svn:log
V 646
Fix a nasty bug that got exposed when the sendsig() and sigreturn()
functions switched to using {g|s}et_mcontext(). The problem is that
sigreturn(), being a syscall, can be given an async. context (i.e.
one corresponding to an interrupt or trap). When this happens, we
try to return to user mode via epc_syscall_return with a trapframe
that can only be used to return to user mode via exception_restore.

To fix this, we check the frame's flags immediately prior to
epc_syscall_return and branch to exception_restore for non-syscall
frames. Modify the assertion in set_mcontext() to check that if
there's a mismatch, it's because of sigreturn().

END