[PATCH] i386: Fix places where using %gs changes the usermode ABI

There are a few places where the change in struct pt_regs and the use of %gs
affect the userspace ABI.  These are primarily debugging interfaces where
thread state can be inspected or extracted.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 905364d42847..dc4272545179 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -315,8 +315,8 @@ void show_regs(struct pt_regs * regs)
                 regs->eax,regs->ebx,regs->ecx,regs->edx);
         printk("ESI: %08lx EDI: %08lx EBP: %08lx",
                 regs->esi, regs->edi, regs->ebp);
-        printk(" DS: %04x ES: %04x\n",
-                0xffff & regs->xds,0xffff & regs->xes);
+        printk(" DS: %04x ES: %04x GS: %04x\n",
+               0xffff & regs->xds,0xffff & regs->xes, 0xffff & regs->xgs);
 
         cr0 = read_cr0();
         cr2 = read_cr2();
@@ -509,7 +509,7 @@ void dump_thread(struct pt_regs * regs, struct user * dump)
         dump->regs.ds = regs->xds;
         dump->regs.es = regs->xes;
         savesegment(fs,dump->regs.fs);
-        savesegment(gs,dump->regs.gs);
+        dump->regs.gs = regs->xgs;
         dump->regs.orig_eax = regs->orig_eax;
         dump->regs.eip = regs->eip;
         dump->regs.cs = regs->xcs;