X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fx86-win32-os.c;h=13f32339adb7ad8031ccdd5e4f24f233892cf9c7;hb=638197e01ef6d5365852758c072b2b102fdceaa6;hp=0b15ad260f7dbc9e029a68992da4da3ef374ba00;hpb=6d94caa24f68a3df5ac73e7072cea3e62e9d87f5;p=sbcl.git

diff --git a/src/runtime/x86-win32-os.c b/src/runtime/x86-win32-os.c
index 0b15ad2..13f3233 100644
--- a/src/runtime/x86-win32-os.c
+++ b/src/runtime/x86-win32-os.c
@@ -42,32 +42,32 @@
 #include "validate.h"
 size_t os_vm_page_size;
 
-int arch_os_thread_init(struct thread *thread) {
+int arch_os_thread_init(struct thread *thread) 
+{
     {
         void *top_exception_frame;
         void *cur_stack_end;
         void *cur_stack_start;
-
+	MEMORY_BASIC_INFORMATION stack_memory;
+	
         asm volatile ("movl %%fs:0,%0": "=r" (top_exception_frame));
         asm volatile ("movl %%fs:4,%0": "=r" (cur_stack_end));
 
-        /*
-         * Can't pull stack start from fs:4 or fs:8 or whatever,
+        /* Can't pull stack start from fs:4 or fs:8 or whatever,
          * because that's only what currently has memory behind
-         * it from being used. Our basic options are to know,
-         * a priori, what the stack size is (1 meg by default)
-         * or to grub the default size out of the executable
-         * header in memory by means of hardcoded addresses and
-         * offsets.
-         *
-         * We'll just assume it's 1 megabyte. Easiest that way.
-         */
-        cur_stack_start = cur_stack_end - 0x100000;
-
-        /*
-         * We use top_exception_frame rather than cur_stack_end
-         * to elide the last few (boring) stack entries at the
-         * bottom of the backtrace.
+         * it from being used, so do a quick VirtualQuery() and
+         * grab the AllocationBase. -AB 2006/11/25
+	 */
+
+	if (!VirtualQuery(&stack_memory, &stack_memory, sizeof(stack_memory))) {
+	    fprintf(stderr, "VirtualQuery: 0x%lx.\n", GetLastError());
+	    lose("Could not query stack memory information.");
+	}
+	cur_stack_start = stack_memory.AllocationBase;
+
+        /* We use top_exception_frame rather than cur_stack_end to
+         * elide the last few (boring) stack entries at the bottom of
+         * the backtrace.
          */
         thread->control_stack_start = cur_stack_start;
         thread->control_stack_end = top_exception_frame;