osfmk/i386/thread.h

   1 /*
   2  * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58
  59 /*
  60  *      File:   machine/thread.h
  61  *
  62  *      This file contains the structure definitions for the thread
  63  *      state as applied to I386 processors.
  64  */
  65
  66 #ifndef _I386_THREAD_H_
  67 #define _I386_THREAD_H_
  68
  69 #include <mach/boolean.h>
  70 #include <mach/i386/vm_types.h>
  71 #include <mach/i386/fp_reg.h>
  72 #include <mach/thread_status.h>
  73
  74 #include <kern/simple_lock.h>
  75
  76 #include <i386/iopb.h>
  77 #include <i386/seg.h>
  78 #include <i386/tss.h>
  79 #include <i386/eflags.h>
  80
  81 #include <i386/cpu_data.h>
  82
  83 #include <machine/pal_routines.h>
  84
  85 /*
  86  *      x86_kernel_state:
  87  *
  88  *      This structure corresponds to the state of kernel registers
  89  *      as saved in a context-switch.  It lives at the base of the stack.
  90  */
  91
  92 struct x86_kernel_state {
  93         uint64_t        k_rbx;  /* kernel context */
  94         uint64_t        k_rsp;
  95         uint64_t        k_rbp;
  96         uint64_t        k_r12;
  97         uint64_t        k_r13;
  98         uint64_t        k_r14;
  99         uint64_t        k_r15;
 100         uint64_t        k_rip;
 101 };
 102
 103 /*
 104  * Maps state flavor to number of words in the state:
 105  */
 106 extern unsigned int _MachineStateCount[];
 107
 108 /*
 109  * The machine-dependent thread state - registers and all platform-dependent
 110  * state - is saved in the machine thread structure which is embedded in
 111  * the thread data structure. For historical reasons this is also referred to
 112  * as the PCB.
 113  */
 114 struct machine_thread {
 115         x86_saved_state_t       *iss;
 116         void                    *ifps;
 117         void                    *ids;
 118         decl_simple_lock_data(,lock);           /* protects ifps and ids */
 119         uint64_t                iss_pte0;
 120         uint64_t                iss_pte1;
 121
 122 #ifdef  MACH_BSD
 123         uint64_t                cthread_self;   /* for use of cthread package */
 124         struct real_descriptor  cthread_desc;
 125         unsigned long           uldt_selector;  /* user ldt selector to set */
 126         struct real_descriptor  uldt_desc;      /* actual user setable ldt */
 127 #endif
 128
 129         struct pal_pcb          pal_pcb;
 130         uint32_t                specFlags;
 131         /* N.B.: These "specFlags" are read-modify-written non-atomically within
 132          * the copyio routine. So conceivably any exception that modifies the
 133          * flags in a persistent manner could be clobbered if it occurs within
 134          * a copyio context. For now, the only other flag here is OnProc which
 135          * is not modified except at context switch.
 136          */
 137 #define         OnProc          0x1
 138 #define         CopyIOActive    0x2 /* Checked to ensure DTrace actions do not re-enter copyio(). */
 139         uint64_t                thread_gpu_ns;
 140 #if NCOPY_WINDOWS > 0
 141         struct {
 142                 user_addr_t     user_base;
 143         } copy_window[NCOPY_WINDOWS];
 144         int                     nxt_window;
 145         int                     copyio_state;
 146 #define         WINDOWS_DIRTY   0
 147 #define         WINDOWS_CLEAN   1
 148 #define         WINDOWS_CLOSED  2
 149 #define         WINDOWS_OPENED  3
 150         uint64_t                physwindow_pte;
 151         int                     physwindow_busy;
 152 #endif
 153 };
 154 typedef struct machine_thread *pcb_t;
 155
 156 #define THREAD_TO_PCB(Thr)      (&(Thr)->machine)
 157
 158 #define USER_STATE(Thr)         ((Thr)->machine.iss)
 159 #define USER_REGS32(Thr)        (saved_state32(USER_STATE(Thr)))
 160 #define USER_REGS64(Thr)        (saved_state64(USER_STATE(Thr)))
 161
 162 #define user_pc(Thr)            (is_saved_state32(USER_STATE(Thr)) ?    \
 163                                         USER_REGS32(Thr)->eip :         \
 164                                         USER_REGS64(Thr)->isf.rip )
 165
 166 extern void *get_user_regs(thread_t);
 167
 168 extern void *act_thread_csave(void);
 169 extern void act_thread_catt(void *ctx);
 170 extern void act_thread_cfree(void *ctx);
 171
 172 #define FIND_PERFCONTROL_STATE(th)      (PERFCONTROL_STATE_NULL)
 173
 174 /*
 175  *      On the kernel stack is:
 176  *      stack:  ...
 177  *              struct x86_kernel_state
 178  *      stack+kernel_stack_size
 179  */
 180
 181 #define STACK_IKS(stack)        \
 182         ((struct x86_kernel_state *)((stack) + kernel_stack_size) - 1)
 183
 184 /*
 185  * Return the current stack depth including x86_kernel_state
 186  */
 187 static inline vm_offset_t
 188 current_stack_depth(void)
 189 {
 190         vm_offset_t     stack_ptr;
 191
 192         assert(get_preemption_level() > 0 || !ml_get_interrupts_enabled());
 193
 194 #if defined(__x86_64__)
 195        __asm__ volatile("mov %%rsp, %0" : "=m" (stack_ptr));
 196 #else
 197        __asm__ volatile("mov %%esp, %0" : "=m" (stack_ptr));
 198 #endif
 199         return (current_cpu_datap()->cpu_kernel_stack
 200                 + sizeof(struct x86_kernel_state)
 201                 - stack_ptr);
 202 }
 203
 204 /*
 205  * Return address of the function that called current function, given
 206  *      address of the first parameter of current function.
 207  */
 208 #define GET_RETURN_PC(addr)     (__builtin_return_address(0))
 209
 210 #endif  /* _I386_THREAD_H_ */