8  *  X86-64 port
23 #include <linux/fs.h>
68 	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L, fs, gs, shadowgs;  in __show_regs()  local
95 		rdmsrl(MSR_FS_BASE, fs);  in __show_regs()
98 		       log_lvl, fs, shadowgs);  in __show_regs()
104 	asm("movl %%fs,%0" : "=r" (fsindex));  in __show_regs()
107 	rdmsrl(MSR_FS_BASE, fs);  in __show_regs()
117 	       log_lvl, fs, fsindex, gs, gsindex, shadowgs);  in __show_regs()
149 	FS,  enumerator
204  * Saves the FS or GS base for an outgoing thread if FSGSBASE extensions are
221 		 * context switch between 64-bit programs), and avoiding  in save_base_legacy()
241 		if (which == FS)  in save_base_legacy()
250 	savesegment(fs, task->thread.fsindex);  in save_fsgs()
261 		save_base_legacy(task, task->thread.fsindex, FS);  in save_fsgs()
286 	if (which == FS)  in loadseg()
287 		loadsegment(fs, sel);  in loadseg()
300 		 * The next task is using 64-bit TLS, is not using this  in load_seg_legacy()
330 			wrmsrl(which == FS ? MSR_FS_BASE : MSR_KERNEL_GS_BASE,  in load_seg_legacy()
346 		/* Update the FS and GS selectors if they could have changed. */  in x86_fsgsbase_load()
348 			loadseg(FS, next->fsindex);  in x86_fsgsbase_load()
357 				next->fsindex, next->fsbase, FS);  in x86_fsgsbase_load()
489 		loadsegment(fs, __USER_DS);  in start_thread_common()
493 	loadsegment(fs, 0);  in start_thread_common()
528  * - could test fs/gs bitsliced
546 	/* We must save %fs and %gs before load_TLS() because  in __switch_to()
547 	 * %fs and %gs may be cleared by load_TLS().  in __switch_to()
641 	/* Make sure to be in 64bit mode */  in set_personality_64bit()
645 	/* Pretend that this comes from a 64bit execve */  in set_personality_64bit()
654 	   But 64bit processes have always behaved this way,  in set_personality_64bit()
755 		 * Not strictly needed for %fs, but do it for symmetry  in do_arch_prctl_64()
767 			loadseg(FS, 0);  in do_arch_prctl_64()