1 files changed, 74 insertions, 0 deletions
diff --git a/windows/bss.c b/windows/bss.c
new file mode 100644
index 0000000000..b860c4ee85
--- /dev/null
+++ b/windows/bss.c
@@ -0,0 +1,74 @@
+/*
+* This file is part of the Micro Python project, http://micropython.org/
+*
+* The MIT License (MIT)
+*
+* Copyright (c) 2013, 2014 Damien P. George
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+* THE SOFTWARE.
+*/
+
+#include "mpconfig.h"
+#include "misc.h"
+#include "nlr.h"
+#include "qstr.h"
+#include "obj.h"
+#include <windows.h>
+
+IMAGE_NT_HEADERS *header_from_memory(const char *module) {
+    BYTE *base_addr = (BYTE*)GetModuleHandleA(module);
+    IMAGE_DOS_HEADER *dos_header = (IMAGE_DOS_HEADER*)base_addr;
+    return (IMAGE_NT_HEADERS*)(base_addr + dos_header->e_lfanew);
+}
+
+IMAGE_SECTION_HEADER *find_section(IMAGE_NT_HEADERS *nt_header, const char *name) {
+    int i;
+    IMAGE_SECTION_HEADER *section = IMAGE_FIRST_SECTION(nt_header);
+    for (i = 0; i < nt_header->FileHeader.NumberOfSections; ++i) {
+        if (strcmp((const char *)section->Name, name) == 0) {
+            return section;
+        }
+        ++section;
+    }
+    return NULL;
+}
+
+void section_boundaries(IMAGE_NT_HEADERS *nt_header, IMAGE_SECTION_HEADER *section, char **start, char **end) {
+    if (section == NULL) {
+        nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Could not lookup section boundaries"));
+    }
+    *start = (char*)(nt_header->OptionalHeader.ImageBase + section->VirtualAddress);
+    *end = *start + section->Misc.VirtualSize;    
+}
+
+void section_boundaries_from_module(const char *module, const char *section, char **start, char **end) {
+    IMAGE_NT_HEADERS *nt_header = header_from_memory(module);
+    IMAGE_SECTION_HEADER *dsection = find_section(nt_header, section);
+    section_boundaries(nt_header, dsection, start, end);   
+}
+
+char *bss_start = 0;
+char *bss_end = 0;
+
+//MSVC has no __bss_start and _end but we can get accurate section info from the PE header.
+//The standard .bss section is appended to the standard .data section however so it cannot
+//be looked up by name. To deal with that we put all uPy static variables in a named section.
+void getbss() {
+    section_boundaries_from_module(NULL, MICROPY_PORT_BSSSECTION, &bss_start, &bss_end);
+}