osfmk/i386/thread_act.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25
  26 #ifndef _I386_THREAD_ACT_H_
  27 #define _I386_THREAD_ACT_H_
  28
  29 #include <mach/boolean.h>
  30 #include <mach/i386/vm_types.h>
  31 #include <mach/i386/fp_reg.h>
  32 #include <mach/thread_status.h>
  33
  34 #include <kern/lock.h>
  35
  36 #include <i386/iopb.h>
  37 #include <i386/tss.h>
  38 #include <i386/eflags.h>
  39
  40 /*
  41  *      i386_saved_state:
  42  *
  43  *      Has been exported to servers.  See: mach/i386/thread_status.h
  44  *
  45  *      This structure corresponds to the state of user registers
  46  *      as saved upon kernel entry.  It lives in the pcb.
  47  *      It is also pushed onto the stack for exceptions in the kernel.
  48  *      For performance, it is also used directly in syscall exceptions
  49  *      if the server has requested i386_THREAD_STATE flavor for the exception
  50  *      port.
  51  *
  52  *      We define the following as an alias for the "esp" field of the
  53  *      structure, because we actually save cr2 here, not the kernel esp.
  54  */
  55 #define cr2     esp
  56
  57 /*
  58  *      Save area for user floating-point state.
  59  *      Allocated only when necessary.
  60  */
  61
  62 struct i386_fpsave_state {
  63         boolean_t               fp_valid;
  64         struct i386_fp_save     fp_save_state;
  65         struct i386_fp_regs     fp_regs;
  66 };
  67
  68 /*
  69  *      v86_assist_state:
  70  *
  71  *      This structure provides data to simulate 8086 mode
  72  *      interrupts.  It lives in the pcb.
  73  */
  74
  75 struct v86_assist_state {
  76         vm_offset_t             int_table;
  77         unsigned short          int_count;
  78         unsigned short          flags;  /* 8086 flag bits */
  79 };
  80 #define V86_IF_PENDING          0x8000  /* unused bit */
  81
  82 /*
  83  *      i386_interrupt_state:
  84  *
  85  *      This structure describes the set of registers that must
  86  *      be pushed on the current ring-0 stack by an interrupt before
  87  *      we can switch to the interrupt stack.
  88  */
  89
  90 struct i386_interrupt_state {
  91         int     es;
  92         int     ds;
  93         int     edx;
  94         int     ecx;
  95         int     eax;
  96         int     eip;
  97         int     cs;
  98         int     efl;
  99 };
 100
 101 /*
 102  *      i386_kernel_state:
 103  *
 104  *      This structure corresponds to the state of kernel registers
 105  *      as saved in a context-switch.  It lives at the base of the stack.
 106  */
 107
 108 struct i386_kernel_state {
 109         int                     k_ebx;  /* kernel context */
 110         int                     k_esp;
 111         int                     k_ebp;
 112         int                     k_edi;
 113         int                     k_esi;
 114         int                     k_eip;
 115 };
 116
 117 /*
 118  *      i386_machine_state:
 119  *
 120  *      This structure corresponds to special machine state.
 121  *      It lives in the pcb.  It is not saved by default.
 122  */
 123
 124 struct i386_machine_state {
 125         iopb_tss_t              io_tss;
 126         struct user_ldt *       ldt;
 127         struct i386_fpsave_state *ifps;
 128         struct v86_assist_state v86s;
 129 };
 130
 131 typedef struct pcb {
 132         struct i386_interrupt_state iis[2];     /* interrupt and NMI */
 133         struct i386_saved_state iss;
 134         struct i386_machine_state ims;
 135 #ifdef  MACH_BSD
 136         unsigned long   cthread_self;           /* for use of cthread package */
 137 #endif
 138         decl_simple_lock_data(,lock)
 139 } *pcb_t;
 140
 141 /*
 142  * Maps state flavor to number of words in the state:
 143  */
 144 extern unsigned int state_count[];
 145
 146
 147 #define USER_REGS(ThrAct)       (&(ThrAct)->mact.pcb->iss)
 148
 149 #define act_machine_state_ptr(ThrAct)   (thread_state_t)USER_REGS(ThrAct)
 150
 151
 152 #define is_user_thread(ThrAct)  \
 153         ((USER_REGS(ThrAct)->efl & EFL_VM) \
 154          || ((USER_REGS(ThrAct)->cs & 0x03) != 0))
 155
 156 #define user_pc(ThrAct)         (USER_REGS(ThrAct)->eip)
 157 #define user_sp(ThrAct)         (USER_REGS(ThrAct)->uesp)
 158
 159 #define syscall_emulation_sync(task)    /* do nothing */
 160
 161 typedef struct MachineThrAct {
 162         /*
 163          * pointer to process control block
 164          *      (actual storage may as well be here, too)
 165          */
 166         struct pcb xxx_pcb;
 167         pcb_t pcb;
 168
 169 } MachineThrAct, *MachineThrAct_t;
 170
 171 extern void *act_thread_csave(void);
 172 extern void act_thread_catt(void *ctx);
 173 extern void act_thread_cfree(void *ctx);
 174
 175 #define current_act_fast()      (current_thread()->top_act)
 176 #define current_act_slow()      ((current_thread()) ?                   \
 177                                                                 current_act_fast() :            \
 178                                                                 THR_ACT_NULL)
 179
 180 #define current_act()   current_act_slow()    /* JMM - til we find the culprit */
 181
 182 #endif  /* _I386_THREAD_ACT_H_ */