src/runtime/x86-win32-os.c

   1 /*
   2  * The x86 Win32 incarnation of arch-dependent OS-dependent routines.
   3  * See also "win32-os.c".
   4  */
   5
   6 /*
   7  * This software is part of the SBCL system. See the README file for
   8  * more information.
   9  *
  10  * This software is derived from the CMU CL system, which was
  11  * written at Carnegie Mellon University and released into the
  12  * public domain. The software is in the public domain and is
  13  * provided with absolutely no warranty. See the COPYING and CREDITS
  14  * files for more information.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stddef.h>
  19 #include <sys/param.h>
  20 #include <sys/file.h>
  21 #include <sys/types.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24
  25 #include "./signal.h"
  26 #include "os.h"
  27 #include "arch.h"
  28 #include "globals.h"
  29 #include "interrupt.h"
  30 #include "interr.h"
  31 #include "lispregs.h"
  32 #include "sbcl.h"
  33
  34 #include <sys/types.h>
  35 #include <signal.h>
  36 #include <sys/time.h>
  37 #include <sys/stat.h>
  38 #include <unistd.h>
  39 #include "thread.h"             /* dynamic_values_bytes */
  40
  41
  42 #include "validate.h"
  43 size_t os_vm_page_size;
  44
  45 int arch_os_thread_init(struct thread *thread)
  46 {
  47     {
  48         void *top_exception_frame;
  49         void *cur_stack_end;
  50         void *cur_stack_start;
  51         MEMORY_BASIC_INFORMATION stack_memory;
  52
  53         asm volatile ("movl %%fs:0,%0": "=r" (top_exception_frame));
  54         asm volatile ("movl %%fs:4,%0": "=r" (cur_stack_end));
  55
  56         /* Can't pull stack start from fs:4 or fs:8 or whatever,
  57          * because that's only what currently has memory behind
  58          * it from being used, so do a quick VirtualQuery() and
  59          * grab the AllocationBase. -AB 2006/11/25
  60          */
  61
  62         if (!VirtualQuery(&stack_memory, &stack_memory, sizeof(stack_memory))) {
  63             fprintf(stderr, "VirtualQuery: 0x%lx.\n", GetLastError());
  64             lose("Could not query stack memory information.");
  65         }
  66         cur_stack_start = stack_memory.AllocationBase;
  67
  68         /* We use top_exception_frame rather than cur_stack_end to
  69          * elide the last few (boring) stack entries at the bottom of
  70          * the backtrace.
  71          */
  72         thread->control_stack_start = cur_stack_start;
  73         thread->control_stack_end = top_exception_frame;
  74
  75 #ifndef LISP_FEATURE_SB_THREAD
  76         /*
  77          * Theoretically, threaded SBCL binds directly against
  78          * the thread structure for these values. We don't do
  79          * threads yet, but we'll probably do the same. We do
  80          * need to reset these, though, because they were
  81          * initialized based on the wrong stack space.
  82          */
  83         SetSymbolValue(CONTROL_STACK_START,(lispobj)thread->control_stack_start,thread);
  84         SetSymbolValue(CONTROL_STACK_END,(lispobj)thread->control_stack_end,thread);
  85 #endif
  86     }
  87
  88 #ifdef LISP_FEATURE_SB_THREAD
  89     /* this must be called from a function that has an exclusive lock
  90      * on all_threads
  91      */
  92     struct user_desc ldt_entry = {
  93         1, 0, 0, /* index, address, length filled in later */
  94         1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
  95     };
  96     int n;
  97     get_spinlock(&modify_ldt_lock,thread);
  98     n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
  99     /* get next free ldt entry */
 100
 101     if(n) {
 102         u32 *p;
 103         for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
 104             n++;
 105     }
 106     ldt_entry.entry_number=n;
 107     ldt_entry.base_addr=(unsigned long) thread;
 108     ldt_entry.limit=dynamic_values_bytes;
 109     ldt_entry.limit_in_pages=0;
 110     if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
 111         modify_ldt_lock=0;
 112         /* modify_ldt call failed: something magical is not happening */
 113         return -1;
 114     }
 115     __asm__ __volatile__ ("movw %w0, %%fs" : : "q"
 116                           ((n << 3) /* selector number */
 117                            + (1 << 2) /* TI set = LDT */
 118                            + 3)); /* privilege level */
 119     thread->tls_cookie=n;
 120     modify_ldt_lock=0;
 121
 122     if(n<0) return 0;
 123 #endif
 124
 125     return 1;
 126 }
 127
 128 /* free any arch/os-specific resources used by thread, which is now
 129  * defunct.  Not called on live threads
 130  */
 131
 132 int arch_os_thread_cleanup(struct thread *thread) {
 133     return 0;
 134 }
 135
 136 os_context_register_t *
 137 os_context_register_addr(os_context_t *context, int offset)
 138 {
 139     switch(offset) {
 140     case reg_EAX: return &context->Eax;
 141     case reg_ECX: return &context->Ecx;
 142     case reg_EDX: return &context->Edx;
 143     case reg_EBX: return &context->Ebx;
 144     case reg_ESP: return &context->Esp;
 145     case reg_EBP: return &context->Ebp;
 146     case reg_ESI: return &context->Esi;
 147     case reg_EDI: return &context->Edi;
 148     default: return 0;
 149     }
 150 }
 151
 152 os_context_register_t *
 153 os_context_pc_addr(os_context_t *context)
 154 {
 155     return &context->Eip; /*  REG_EIP */
 156 }
 157
 158 os_context_register_t *
 159 os_context_sp_addr(os_context_t *context)
 160 {
 161     return &context->Esp; /* REG_UESP */
 162 }
 163
 164 os_context_register_t *
 165 os_context_fp_addr(os_context_t *context)
 166 {
 167     return &context->Ebp; /* REG_EBP */
 168 }
 169
 170 unsigned long
 171 os_context_fp_control(os_context_t *context)
 172 {
 173     return ((((context->FloatSave.ControlWord) & 0xffff) ^ 0x3f) |
 174             (((context->FloatSave.StatusWord) & 0xffff) << 16));
 175 }
 176
 177 void
 178 os_restore_fp_control(os_context_t *context)
 179 {
 180     asm ("fldcw %0" : : "m" (context->FloatSave.ControlWord));
 181 }
 182
 183 void
 184 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 185 {
 186 }