Initialize %fs, %gs, and floating-point status as well.

diff --git a/sysdeps/unix/sysv/linux/i386/makecontext.S b/sysdeps/unix/sysv/linux/i386/makecontext.S
index 56b5537..1ca3233 100644 (file)
--- a/sysdeps/unix/sysv/linux/i386/makecontext.S
+++ b/sysdeps/unix/sysv/linux/i386/makecontext.S
@@ -40,6 +40,22 @@ ENTRY(__makecontext)
        movl    oLINK(%eax), %ecx
        movl    %ecx, -4(%edx)
 
+       /* Copy the FS and GS segment register.  */
+       xorl    %ecx, %ecx
+       movw    %gs, %cx
+       movl    %ecx, oGS(%eax)
+       xorl    %ecx, %ecx
+       movw    %fs, %cx
+       movl    %ecx, oFS(%eax)
+
+       /* We have separate floating-point register content memory on the
+          stack.  We use the __fpregs_mem block in the context.  Set the
+          links up correctly.  */
+       leal    oFPREGSMEM(%eax), %ecx
+       movl    %ecx, oFPREGS(%eax)
+       /* Save the floating-point context.  */
+       fnstenv (%ecx)
+
        /* Remember the number of parameters for the exit handler since
           it has to remove them.  We store the number in the EBX register
           which the function we will call must preserve.  */