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Commit fd51f666 authored by H. J. Lu's avatar H. J. Lu Committed by Linus Torvalds
Browse files

[PATCH] i386/x86_64 segment register access update 



The new i386/x86_64 assemblers no longer accept instructions for moving
between a segment register and a 32bit memory location, i.e.,

        movl (%eax),%ds
        movl %ds,(%eax)

To generate instructions for moving between a segment register and a
16bit memory location without the 16bit operand size prefix, 0x66,

        mov (%eax),%ds
        mov %ds,(%eax)

should be used. It will work with both new and old assemblers. The
assembler starting from 2.16.90.0.1 will also support

        movw (%eax),%ds
        movw %ds,(%eax)

without the 0x66 prefix. I am enclosing patches for 2.4 and 2.6 kernels
here. The resulting kernel binaries should be unchanged as before, with
old and new assemblers, if gcc never generates memory access for

               unsigned gsindex;
               asm volatile("movl %%gs,%0" : "=g" (gsindex));

If gcc does generate memory access for the code above, the upper bits
in gsindex are undefined and the new assembler doesn't allow it.

Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent d5b63d78

arch/i386/kernel/process.c

+2 −2
Original line number Diff line number Diff line
@@ -611,8 +611,8 @@ struct task_struct fastcall * __switch_to(struct task_struct *prev_p, struct tas 
	 * Save away %fs and %gs. No need to save %es and %ds, as

	 * those are always kernel segments while inside the kernel.

	 */

	asm volatile("movl %%fs,%0":"=m" (*(int *)&prev->fs));

	asm volatile("movl %%gs,%0":"=m" (*(int *)&prev->gs));

	asm volatile("mov %%fs,%0":"=m" (prev->fs));

	asm volatile("mov %%gs,%0":"=m" (prev->gs));



	/*

	 * Restore %fs and %gs if needed.

arch/i386/kernel/vm86.c

+2 −2
Original line number Diff line number Diff line
@@ -294,8 +294,8 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk 
 */

	info->regs32->eax = 0;

	tsk->thread.saved_esp0 = tsk->thread.esp0;

	asm volatile("movl %%fs,%0":"=m" (tsk->thread.saved_fs));

	asm volatile("movl %%gs,%0":"=m" (tsk->thread.saved_gs));

	asm volatile("mov %%fs,%0":"=m" (tsk->thread.saved_fs));

	asm volatile("mov %%gs,%0":"=m" (tsk->thread.saved_gs));



	tss = &per_cpu(init_tss, get_cpu());

	tsk->thread.esp0 = (unsigned long) &info->VM86_TSS_ESP0;

arch/x86_64/kernel/process.c

+6 −6
Original line number Diff line number Diff line
@@ -402,10 +402,10 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp, 
	p->thread.fs = me->thread.fs;

	p->thread.gs = me->thread.gs;



	asm("movl %%gs,%0" : "=m" (p->thread.gsindex));

	asm("movl %%fs,%0" : "=m" (p->thread.fsindex));

	asm("movl %%es,%0" : "=m" (p->thread.es));

	asm("movl %%ds,%0" : "=m" (p->thread.ds));

	asm("mov %%gs,%0" : "=m" (p->thread.gsindex));

	asm("mov %%fs,%0" : "=m" (p->thread.fsindex));

	asm("mov %%es,%0" : "=m" (p->thread.es));

	asm("mov %%ds,%0" : "=m" (p->thread.ds));



	if (unlikely(me->thread.io_bitmap_ptr != NULL)) { 

		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
@@ -468,11 +468,11 @@ struct task_struct *__switch_to(struct task_struct *prev_p, struct task_struct * 
	 * Switch DS and ES.

	 * This won't pick up thread selector changes, but I guess that is ok.

	 */

	asm volatile("movl %%es,%0" : "=m" (prev->es)); 

	asm volatile("mov %%es,%0" : "=m" (prev->es));

	if (unlikely(next->es | prev->es))

		loadsegment(es, next->es); 

	

	asm volatile ("movl %%ds,%0" : "=m" (prev->ds)); 

	asm volatile ("mov %%ds,%0" : "=m" (prev->ds));

	if (unlikely(next->ds | prev->ds))

		loadsegment(ds, next->ds);

include/asm-i386/system.h

+3 −3
Original line number Diff line number Diff line
@@ -81,7 +81,7 @@ static inline unsigned long _get_base(char * addr) 
#define loadsegment(seg,value)			\

	asm volatile("\n"			\

		"1:\t"				\

		"movl %0,%%" #seg "\n"		\

		"mov %0,%%" #seg "\n"		\

		"2:\n"				\

		".section .fixup,\"ax\"\n"	\

		"3:\t"				\
@@ -93,13 +93,13 @@ static inline unsigned long _get_base(char * addr) 
		".align 4\n\t"			\

		".long 1b,3b\n"			\

		".previous"			\

		: :"m" (*(unsigned int *)&(value)))

		: :"m" (value))



/*

 * Save a segment register away

 */

#define savesegment(seg, value) \

	asm volatile("movl %%" #seg ",%0":"=m" (*(int *)&(value)))

	asm volatile("mov %%" #seg ",%0":"=m" (value))



/*

 * Clear and set 'TS' bit respectively