Simplification of the signal trampoline and other cleanups.

o  Remove unused defines from genassym.c that were needed
   by the trampoline.
o  Add load_gs_param function to support.s that catches
   a fault when %gs is loaded with an invalid descriptor.
   The function returns EFAULT in that case.
o  Remove struct trapframe from mcontext_t and replace it
   with the list of registers.
o  Modify sendsig and sigreturn accordingly.

This commit contains a patch by bde.

Reviewed by: luoqi, jdp

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/i386/include/md_var.h b/sys/i386/include/md_var.h
index 755e1e7..d9a43fa 100644
--- a/sys/i386/include/md_var.h
+++ b/sys/i386/include/md_var.h
@@ -91,6 +91,7 @@ int	i586_copyout __P((const void *kaddr, void *udaddr, size_t len));
 void	i686_pagezero __P((void *addr));
 int	is_physical_memory __P((vm_offset_t addr));
 u_long	kvtop __P((void *addr));
+int	load_gs_param __P((u_int sel));
 void	setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl,
 		    int selec));
 void	swi_vm __P((void));