On Sun, Apr 07, 2002 at 08:12:01PM -0400, Roland McGrath wrote: > I have implemented the %gs:0 pseudo-register in oskit-mach. If you are > already using oskit-mach, please update and try out the new code. What you > should now see is that in user threads %gs has a different value from %ds. > You should be able to read and write one and only one word at %gs:0. This > should initially read as zero in new threads, and be saved and restored by > thread switching.
You forgot to make the page table entries also user accessible. Other
than that, everything works perfect. Thank you.
2002-04-21 Jeroen Dekkers <[EMAIL PROTECTED]>
* i386/intel/pmap.c (pmap_bootstrap): Make page table entries
accessible in user-mode.
Index: i386/intel/pmap.c
===================================================================
RCS file: /cvsroot/hurd/gnumach/i386/intel/pmap.c,v
retrieving revision 1.3.2.4
diff -u -p -r1.3.2.4 pmap.c
--- i386/intel/pmap.c 8 Apr 2002 00:09:43 -0000 1.3.2.4
+++ i386/intel/pmap.c 21 Apr 2002 02:19:17 -0000
@@ -717,7 +717,7 @@ void pmap_bootstrap()
{
extern char _start[], etext[];
- entry |= pa_to_pte(va) | INTEL_PTE_VALID;
+ entry |= pa_to_pte(va) | INTEL_PTE_VALID |
+INTEL_PTE_USER;
if ((va < (vm_offset_t)_start)
|| (va + INTEL_PGBYTES > (vm_offset_t)etext))
entry |= INTEL_PTE_WRITE;
Jeroen Dekkers
--
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