Changeset 47518 in vbox for trunk/src

Timestamp:

Aug 2, 2013 12:26:46 AM (11 years ago)

Author:

vboxsync

Message:

Found more details, extended the hack a little to be on the safe side (hopefully).

Location:

trunk/src

Files:

• VBox/HostDrivers/Support/SUPDrvTracer.cpp (modified) (1 diff)
• bldprogs/VBoxTpG.cpp (modified) (2 diffs)

trunk/src/VBox/HostDrivers/Support/SUPDrvTracer.cpp

@@ -346 +346 @@
         /* The loader and/or ld64-97.17 seems not to generate fixups for our
            __VTGObj section. Detect this by comparing them with the
-           u64VtgObjSectionStart member and assume max image size of 4MB. */
+           u64VtgObjSectionStart member and assume max image size of 4MB.
+           Seems to be worked around by the __VTGPrLc.End and __VTGPrLc.Begin
+           padding fudge, meaning that the linker misplaced the relocations. */
         if (   (int64_t)u64Tmp != (int32_t)u64Tmp
             && pVtgHdr->u64VtgObjSectionStart != uVtgHdrAddr

trunk/src/bldprogs/VBoxTpG.cpp

@@ -484 +484 @@
                     "VTG_GLOBAL g_aVTGObj_LinkerPleaseNoticeMe, data\n"
                     "  [section __VTG __VTGPrLc.Begin align=16]\n"
+                    "  dq 0, 0 ; Paranoia, related to the fudge below.\n"
                     "VTG_GLOBAL g_aVTGPrLc, data\n"
                     "  [section __VTG __VTGPrLc align=16]\n"
@@ -489 +490 @@
                     "  [section __VTG __VTGPrLc.End   align=16]\n"
                     "VTG_GLOBAL g_aVTGPrLc_End, data\n"
-                    "  dq 0, 0 ; Fudge to work around unidentified linker/loader issue, causing a partial address\n"
-                    "          ; to be written to the start of the first entry, generally making the line number\n"
-                    "          ; invalid. (1 byte is actually enough)\n"
+                    "  dq 0, 0 ; Fudge to work around unidentified linker where it would otherwise generate\n"
+                    "          ; a fix up of the first dword in __VTGPrLc.Begin despite the fact that it were\n"
+                    "          ; an empty section with nothing whatsoever to fix up.\n"
                     " %%endif\n"
                     " [section __VTG __VTGObj]\n"