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authorDJ Delorie <dj@redhat.com>2000-07-07 20:01:35 +0000
committerDJ Delorie <dj@redhat.com>2000-07-07 20:01:35 +0000
commit5f577f7d708da8fa779d62497c877dd6da112c73 (patch)
treeb9029fb9e6f671ba4ffed87f3cf1b8ebdc65e895 /ld/emultempl
parent27e232885db363fb545fd2f450e72d929e59b8f6 (diff)
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* ld/emultempl/pe.em (pe_enable_auto_image_base): New variable.
(longopts): New --{enable,disable}-auto-image-base options. (gld_${EMULATION_NAME}_list_options): Document. (gld_${EMULATION_NAME}_parse): Handle. (strhash): New static function. (compute_dll_image_base): New static function. (gld_${EMULATION_NAME}_set_symbols): Use.
Diffstat (limited to 'ld/emultempl')
-rw-r--r--ld/emultempl/pe.em49
1 files changed, 48 insertions, 1 deletions
diff --git a/ld/emultempl/pe.em b/ld/emultempl/pe.em
index a52d491..c7cb96c 100644
--- a/ld/emultempl/pe.em
+++ b/ld/emultempl/pe.em
@@ -118,6 +118,7 @@ static int pe_enable_stdcall_fixup = -1; /* 0=disable 1=enable */
#ifdef DLL_SUPPORT
static char *pe_out_def_filename = NULL;
static char *pe_implib_filename = NULL;
+static int pe_enable_auto_image_base = 0;
#endif
extern const char *output_filename;
@@ -169,6 +170,8 @@ gld_${EMULATION_NAME}_before_parse()
#define OPTION_THUMB_ENTRY (OPTION_IMPLIB_FILENAME + 1)
#define OPTION_WARN_DUPLICATE_EXPORTS (OPTION_THUMB_ENTRY + 1)
#define OPTION_IMP_COMPAT (OPTION_WARN_DUPLICATE_EXPORTS + 1)
+#define OPTION_ENABLE_AUTO_IMAGE_BASE (OPTION_IMP_COMPAT + 1)
+#define OPTION_DISABLE_AUTO_IMAGE_BASE (OPTION_ENABLE_AUTO_IMAGE_BASE + 1)
static struct option longopts[] =
{
@@ -203,6 +206,8 @@ static struct option longopts[] =
{"out-implib", required_argument, NULL, OPTION_IMPLIB_FILENAME},
{"warn-duplicate-exports", no_argument, NULL, OPTION_WARN_DUPLICATE_EXPORTS},
{"compat-implib", no_argument, NULL, OPTION_IMP_COMPAT},
+ {"enable-auto-image-base", no_argument, NULL, OPTION_ENABLE_AUTO_IMAGE_BASE},
+ {"disable-auto-image-base", no_argument, NULL, OPTION_DISABLE_AUTO_IMAGE_BASE},
#endif
{NULL, no_argument, NULL, 0}
};
@@ -282,6 +287,9 @@ gld_${EMULATION_NAME}_list_options (file)
fprintf (file, _(" --warn-duplicate-exports Warn about duplicate exports.\n"));
fprintf (file, _(" --compat-implib Create backward compatible import libs;\n"));
fprintf (file, _(" create __imp_<SYMBOL> as well.\n"));
+ fprintf (file, _(" --enable-auto-image-base Automatically choose image base for DLLs\n"));
+ fprintf (file, _(" unless user specifies one\n"));
+ fprintf (file, _(" --disable-auto-image-base Do not auto-choose image base. (default)\n"));
#endif
}
@@ -540,11 +548,49 @@ gld_${EMULATION_NAME}_parse_args(argc, argv)
case OPTION_IMP_COMPAT:
pe_dll_compat_implib = 1;
break;
+ case OPTION_ENABLE_AUTO_IMAGE_BASE:
+ pe_enable_auto_image_base = 1;
+ break;
+ case OPTION_DISABLE_AUTO_IMAGE_BASE:
+ pe_enable_auto_image_base = 0;
+ break;
#endif
}
return 1;
}
+
+static unsigned long
+strhash (const char *str)
+{
+ const unsigned char *s;
+ unsigned long hash;
+ unsigned int c;
+ unsigned int len;
+
+ hash = 0;
+ len = 0;
+ s = (const unsigned char *) str;
+ while ((c = *s++) != '\0')
+ {
+ hash += c + (c << 17);
+ hash ^= hash >> 2;
+ ++len;
+ }
+ hash += len + (len << 17);
+ hash ^= hash >> 2;
+
+ return hash;
+}
+
+/* Use the output file to create a image base for relocatable DLLs. */
+static unsigned long
+compute_dll_image_base (const char *ofile)
+{
+ unsigned long hash = strhash (ofile);
+ return 0x60000000 | ((hash << 16) & 0x0FFC0000);
+}
+
/* Assign values to the special symbols before the linker script is
read. */
@@ -561,7 +607,8 @@ gld_${EMULATION_NAME}_set_symbols ()
if (link_info.relocateable)
init[IMAGEBASEOFF].value = 0;
else if (init[DLLOFF].value || link_info.shared)
- init[IMAGEBASEOFF].value = NT_DLL_IMAGE_BASE;
+ init[IMAGEBASEOFF].value = (pe_enable_auto_image_base) ?
+ compute_dll_image_base (output_filename) : NT_DLL_IMAGE_BASE;
else
init[IMAGEBASEOFF].value = NT_EXE_IMAGE_BASE;
}