On Thursday 31 December 2009 17:32:02, Danny Backx wrote:
> On Thu, 2009-12-31 at 16:11 +0000, Pedro Alves wrote:
> > And, I'm using ld's --defsym switch to define it.
>
> > It looks like Windows Mobile 6.1's loader is darn strict WRT
> > to base relocations, and we'll have to figure out a different
> > way to get at the runtime image base.
>
> A variation of what both you and I have tried should do the trick,
> shouldn't it ?
>
> Based on the values in your example :
> - we can't pass __image_base__ = 0x010000
> - but we can pass 0x011000 == &DllMainCRTStartup
> then all the additional info we need is 0x01000 (BaseOfCode).
Yes, but this patch instead should be quite upstreamable:
Index: binutils/ld/scripttempl/pe.sc
===================================================================
--- binutils.orig/ld/scripttempl/pe.sc 2009-12-31 17:50:54.000000000 +0000
+++ binutils/ld/scripttempl/pe.sc 2009-12-31 17:52:29.000000000 +0000
@@ -70,6 +70,7 @@ SECTIONS
${RELOCATING+. = ALIGN(__section_alignment__);}
.text ${RELOCATING+ __image_base__ + ( __section_alignment__ <
${TARGET_PAGE_SIZE} ? . : __section_alignment__ )} :
{
+ ${RELOCATING+__text_start__ = . ;}
${RELOCATING+ *(.init)}
*(.text)
${R_TEXT}
@@ -85,6 +86,7 @@ SECTIONS
${RELOCATING+ *(.gcc_exc)}
${RELOCATING+PROVIDE (etext = .);}
${RELOCATING+ *(.gcc_except_table)}
+ ${RELOCATING+__text_end__ = . ;}
}
/* The Cygwin32 library uses a section to avoid copying certain data
There are already __data_start__, __data_end__ and
__bss_start__, __bss_end__ symbols, only text range is missing.
For the 0x01000, we could just hardcode it. In practice, this is
the usual size of the PE headers. Can an image have a bigger header
than that, in practice? Or are the variable size bits all in
idata, edata, etc., which end up in allocated section? I know that
gdb hardcodes the 0x1000 (src/gdb/windows-nat.c).
I don't think it is possible on Windows CE to read the
IMAGE_OPTIONAL_HEADER and friends from DllMainCRTStartup, starting from
the passed in handle? We could get at the image base that way, but
I think that's only possible on non-CE Windows. Am I wrong?
--
Pedro Alves
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