arch/x86/um/asm/processor_32.h

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __UM_PROCESSOR_I386_H
   7 #define __UM_PROCESSOR_I386_H
   8
   9 #include <linux/string.h>
  10 #include <asm/segment.h>
  11 #include <asm/ldt.h>
  12
  13 extern int host_has_cmov;
  14
  15 struct uml_tls_struct {
  16         struct user_desc tls;
  17         unsigned flushed:1;
  18         unsigned present:1;
  19 };
  20
  21 struct arch_thread {
  22         struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
  23         unsigned long debugregs[8];
  24         int debugregs_seq;
  25         struct faultinfo faultinfo;
  26 };
  27
  28 #define INIT_ARCH_THREAD { \
  29         .tls_array              = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
  30                                     { .present = 0, .flushed = 0 } }, \
  31         .debugregs              = { [ 0 ... 7 ] = 0 }, \
  32         .debugregs_seq          = 0, \
  33         .faultinfo              = { 0, 0, 0 } \
  34 }
  35
  36 #define STACKSLOTS_PER_LINE 8
  37
  38 static inline void arch_flush_thread(struct arch_thread *thread)
  39 {
  40         /* Clear any TLS still hanging */
  41         memset(&thread->tls_array, 0, sizeof(thread->tls_array));
  42 }
  43
  44 static inline void arch_copy_thread(struct arch_thread *from,
  45                                     struct arch_thread *to)
  46 {
  47         memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
  48 }
  49
  50 /*
  51  * Default implementation of macro that returns current
  52  * instruction pointer ("program counter"). Stolen
  53  * from asm-i386/processor.h
  54  */
  55 #define current_text_addr() \
  56         ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
  57
  58 #define current_sp() ({ void *sp; __asm__("movl %%esp, %0" : "=r" (sp) : ); sp; })
  59 #define current_bp() ({ unsigned long bp; __asm__("movl %%ebp, %0" : "=r" (bp) : ); bp; })
  60
  61 #endif