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Diffstat (limited to 'arch/x86_64/kernel/process.c')
-rw-r--r--arch/x86_64/kernel/process.c47
1 files changed, 27 insertions, 20 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
index 59be85d9a4b..5afd63e8cef 100644
--- a/arch/x86_64/kernel/process.c
+++ b/arch/x86_64/kernel/process.c
@@ -144,7 +144,8 @@ void cpu_idle_wait(void)
144 do { 144 do {
145 ssleep(1); 145 ssleep(1);
146 for_each_online_cpu(cpu) { 146 for_each_online_cpu(cpu) {
147 if (cpu_isset(cpu, map) && !per_cpu(cpu_idle_state, cpu)) 147 if (cpu_isset(cpu, map) &&
148 !per_cpu(cpu_idle_state, cpu))
148 cpu_clear(cpu, map); 149 cpu_clear(cpu, map);
149 } 150 }
150 cpus_and(map, map, cpu_online_map); 151 cpus_and(map, map, cpu_online_map);
@@ -275,7 +276,8 @@ void __show_regs(struct pt_regs * regs)
275 system_utsname.version); 276 system_utsname.version);
276 printk("RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->rip); 277 printk("RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->rip);
277 printk_address(regs->rip); 278 printk_address(regs->rip);
278 printk("\nRSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss, regs->rsp, regs->eflags); 279 printk("\nRSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss, regs->rsp,
280 regs->eflags);
279 printk("RAX: %016lx RBX: %016lx RCX: %016lx\n", 281 printk("RAX: %016lx RBX: %016lx RCX: %016lx\n",
280 regs->rax, regs->rbx, regs->rcx); 282 regs->rax, regs->rbx, regs->rcx);
281 printk("RDX: %016lx RSI: %016lx RDI: %016lx\n", 283 printk("RDX: %016lx RSI: %016lx RDI: %016lx\n",
@@ -427,15 +429,14 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp,
427 struct pt_regs * childregs; 429 struct pt_regs * childregs;
428 struct task_struct *me = current; 430 struct task_struct *me = current;
429 431
430 childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1; 432 childregs = ((struct pt_regs *)
431 433 (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
432 *childregs = *regs; 434 *childregs = *regs;
433 435
434 childregs->rax = 0; 436 childregs->rax = 0;
435 childregs->rsp = rsp; 437 childregs->rsp = rsp;
436 if (rsp == ~0UL) { 438 if (rsp == ~0UL)
437 childregs->rsp = (unsigned long)childregs; 439 childregs->rsp = (unsigned long)childregs;
438 }
439 440
440 p->thread.rsp = (unsigned long) childregs; 441 p->thread.rsp = (unsigned long) childregs;
441 p->thread.rsp0 = (unsigned long) (childregs+1); 442 p->thread.rsp0 = (unsigned long) (childregs+1);
@@ -457,7 +458,8 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp,
457 p->thread.io_bitmap_max = 0; 458 p->thread.io_bitmap_max = 0;
458 return -ENOMEM; 459 return -ENOMEM;
459 } 460 }
460 memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr, IO_BITMAP_BYTES); 461 memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr,
462 IO_BITMAP_BYTES);
461 } 463 }
462 464
463 /* 465 /*
@@ -494,7 +496,8 @@ out:
494 * - fold all the options into a flag word and test it with a single test. 496 * - fold all the options into a flag word and test it with a single test.
495 * - could test fs/gs bitsliced 497 * - could test fs/gs bitsliced
496 */ 498 */
497struct task_struct *__switch_to(struct task_struct *prev_p, struct task_struct *next_p) 499struct task_struct *
500__switch_to(struct task_struct *prev_p, struct task_struct *next_p)
498{ 501{
499 struct thread_struct *prev = &prev_p->thread, 502 struct thread_struct *prev = &prev_p->thread,
500 *next = &next_p->thread; 503 *next = &next_p->thread;
@@ -565,7 +568,8 @@ struct task_struct *__switch_to(struct task_struct *prev_p, struct task_struct *
565 prev->userrsp = read_pda(oldrsp); 568 prev->userrsp = read_pda(oldrsp);
566 write_pda(oldrsp, next->userrsp); 569 write_pda(oldrsp, next->userrsp);
567 write_pda(pcurrent, next_p); 570 write_pda(pcurrent, next_p);
568 write_pda(kernelstack, (unsigned long)next_p->thread_info + THREAD_SIZE - PDA_STACKOFFSET); 571 write_pda(kernelstack,
572 (unsigned long)next_p->thread_info + THREAD_SIZE - PDA_STACKOFFSET);
569 573
570 /* 574 /*
571 * Now maybe reload the debug registers 575 * Now maybe reload the debug registers
@@ -646,7 +650,9 @@ asmlinkage long sys_fork(struct pt_regs *regs)
646 return do_fork(SIGCHLD, regs->rsp, regs, 0, NULL, NULL); 650 return do_fork(SIGCHLD, regs->rsp, regs, 0, NULL, NULL);
647} 651}
648 652
649asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp, void __user *parent_tid, void __user *child_tid, struct pt_regs *regs) 653asmlinkage long
654sys_clone(unsigned long clone_flags, unsigned long newsp,
655 void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
650{ 656{
651 if (!newsp) 657 if (!newsp)
652 newsp = regs->rsp; 658 newsp = regs->rsp;
@@ -682,7 +688,8 @@ unsigned long get_wchan(struct task_struct *p)
682 return 0; 688 return 0;
683 fp = *(u64 *)(p->thread.rsp); 689 fp = *(u64 *)(p->thread.rsp);
684 do { 690 do {
685 if (fp < (unsigned long)stack || fp > (unsigned long)stack+THREAD_SIZE) 691 if (fp < (unsigned long)stack ||
692 fp > (unsigned long)stack+THREAD_SIZE)
686 return 0; 693 return 0;
687 rip = *(u64 *)(fp+8); 694 rip = *(u64 *)(fp+8);
688 if (!in_sched_functions(rip)) 695 if (!in_sched_functions(rip))
@@ -717,8 +724,8 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
717 task->thread.gsindex = 0; 724 task->thread.gsindex = 0;
718 task->thread.gs = addr; 725 task->thread.gs = addr;
719 if (doit) { 726 if (doit) {
720 load_gs_index(0); 727 load_gs_index(0);
721 ret = checking_wrmsrl(MSR_KERNEL_GS_BASE, addr); 728 ret = checking_wrmsrl(MSR_KERNEL_GS_BASE, addr);
722 } 729 }
723 } 730 }
724 put_cpu(); 731 put_cpu();
@@ -735,7 +742,7 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
735 set_32bit_tls(task, FS_TLS, addr); 742 set_32bit_tls(task, FS_TLS, addr);
736 if (doit) { 743 if (doit) {
737 load_TLS(&task->thread, cpu); 744 load_TLS(&task->thread, cpu);
738 asm volatile("movl %0,%%fs" :: "r" (FS_TLS_SEL)); 745 asm volatile("movl %0,%%fs" :: "r"(FS_TLS_SEL));
739 } 746 }
740 task->thread.fsindex = FS_TLS_SEL; 747 task->thread.fsindex = FS_TLS_SEL;
741 task->thread.fs = 0; 748 task->thread.fs = 0;
@@ -745,8 +752,8 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
745 if (doit) { 752 if (doit) {
746 /* set the selector to 0 to not confuse 753 /* set the selector to 0 to not confuse
747 __switch_to */ 754 __switch_to */
748 asm volatile("movl %0,%%fs" :: "r" (0)); 755 asm volatile("movl %0,%%fs" :: "r" (0));
749 ret = checking_wrmsrl(MSR_FS_BASE, addr); 756 ret = checking_wrmsrl(MSR_FS_BASE, addr);
750 } 757 }
751 } 758 }
752 put_cpu(); 759 put_cpu();
@@ -755,9 +762,9 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
755 unsigned long base; 762 unsigned long base;
756 if (task->thread.fsindex == FS_TLS_SEL) 763 if (task->thread.fsindex == FS_TLS_SEL)
757 base = read_32bit_tls(task, FS_TLS); 764 base = read_32bit_tls(task, FS_TLS);
758 else if (doit) { 765 else if (doit)
759 rdmsrl(MSR_FS_BASE, base); 766 rdmsrl(MSR_FS_BASE, base);
760 } else 767 else
761 base = task->thread.fs; 768 base = task->thread.fs;
762 ret = put_user(base, (unsigned long __user *)addr); 769 ret = put_user(base, (unsigned long __user *)addr);
763 break; 770 break;
@@ -766,9 +773,9 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
766 unsigned long base; 773 unsigned long base;
767 if (task->thread.gsindex == GS_TLS_SEL) 774 if (task->thread.gsindex == GS_TLS_SEL)
768 base = read_32bit_tls(task, GS_TLS); 775 base = read_32bit_tls(task, GS_TLS);
769 else if (doit) { 776 else if (doit)
770 rdmsrl(MSR_KERNEL_GS_BASE, base); 777 rdmsrl(MSR_KERNEL_GS_BASE, base);
771 } else 778 else
772 base = task->thread.gs; 779 base = task->thread.gs;
773 ret = put_user(base, (unsigned long __user *)addr); 780 ret = put_user(base, (unsigned long __user *)addr);
774 break; 781 break;