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[RFA-v2] Fix PR 16201: internal error on a cygwin program linked against a DLL with no .data section
- From: "Pierre Muller" <pierre dot muller at ics-cnrs dot unistra dot fr>
- To: "'Joel Brobecker'" <brobecker at adacore dot com>
- Cc: <gdb-patches at sourceware dot org>
- Date: Fri, 13 Dec 2013 22:39:41 +0100
- Subject: [RFA-v2] Fix PR 16201: internal error on a cygwin program linked against a DLL with no .data section
- Authentication-results: sourceware.org; auth=none
- References: <004801cef65e$cb82d1b0$62887510$ at muller@ics-cnrs.unistra.fr> <20131211170204 dot GD3227 at adacore dot com>
> -----Message d'origine-----
> De : gdb-patches-owner@sourceware.org [mailto:gdb-patches-
> owner@sourceware.org] De la part de Joel Brobecker
> Envoyé : mercredi 11 décembre 2013 18:02
> À : Pierre Muller
> Cc : gdb-patches@sourceware.org
> Objet : Re: [PING RFA] Fix PR 16201: internal error on a cygwin program
> linked against a DLL with no .data section
>
> > and an answer from Joel stating that he would prefer
> > that someone else with more knowledge about objfile struct
> > would review my RFA...
> > https://sourceware.org/ml/gdb-patches/2013-12/msg00036.html
> >
> > We got no other reaction yet.
> >
> > Should I press Joel to review it nonetheless
> > or does someone else volunteer to review this patch?
>
> I just re-read the code, and I really think it would be better if
> someone who actually understands the general framework could comment.
> The problem seems, as you stated, relatively well understood, but
> I am not sure how we are expected to fix it.
>
> > 2013-11-27 Pierre Muller <muller@sourceware.org>
> >
> > PR 16201
> > coff-pe-read.c (read_pe_exported_syms): Set sect_index_text,
> > sect_index_data and sect_index_bss of objfile struct, even if
> > there is no canonical '.text', '.data' or '.bss' named
> section.
>
> My only comment is that the patch could gain from some additional
> comments explaining _why_ you're forcing the sect_index field
> ("event if already set before"), and what you are trying to achieve.
Here is a new version in which I try to explain
more clearly that if we find the canonical
'.text', '.data' or '.bss' section names,
we should use these sections to set sect_index_XXX.
Otherwise, we use the first section that is used later with
for which we set ms_type to mst_XXX to also set sect_index_XXX.
This ensure that sect_index_XXX is always set if
any exported symbol is in inserted using
prim_rcord_minimal_symbol with ms_type parameter set to mst_XXX
I hope this clarifies the patch .
Pierre
ChangeLog entry:
2013-12-13 Pierre Muller <muller@sourceware.org>
Fix PR16201.
coff-pe-read.c (read_pe_exported_syms): Set OBJFILE->sect_index_XXX
for XXX text, data or bss to any section that sets ms_type
field of section_data to mst_XXX, with preference
to canonical names '.text', '.data' and '.bss'.
diff --git a/gdb/coff-pe-read.c b/gdb/coff-pe-read.c
index 91ee3f6..ec9aed5 100644
--- a/gdb/coff-pe-read.c
+++ b/gdb/coff-pe-read.c
@@ -466,6 +466,15 @@ read_pe_exported_syms (struct objfile *objfile)
{
section_data[sectix].rva_start = vaddr;
section_data[sectix].rva_end = vaddr + vsize;
+ /* For .text, .data and .bss section
+ set corresponding sect_index_XXX,
+ even if it was already set before. */
+ if (sectix == PE_SECTION_INDEX_TEXT)
+ objfile->sect_index_text = sectix;
+ if (sectix == PE_SECTION_INDEX_DATA)
+ objfile->sect_index_data = sectix;
+ if (sectix == PE_SECTION_INDEX_BSS)
+ objfile->sect_index_bss = sectix;
}
else
{
@@ -480,11 +489,23 @@ read_pe_exported_syms (struct objfile *objfile)
section_data[otherix].rva_end = vaddr + vsize;
section_data[otherix].vma_offset = 0;
if (characteristics & IMAGE_SCN_CNT_CODE)
- section_data[otherix].ms_type = mst_text;
+ {
+ section_data[otherix].ms_type = mst_text;
+ if (objfile->sect_index_text == -1)
+ objfile->sect_index_text = otherix;
+ }
else if (characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
- section_data[otherix].ms_type = mst_data;
+ {
+ section_data[otherix].ms_type = mst_data;
+ if (objfile->sect_index_data == -1)
+ objfile->sect_index_data = otherix;
+ }
else if (characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
- section_data[otherix].ms_type = mst_bss;
+ {
+ section_data[otherix].ms_type = mst_bss;
+ if (objfile->sect_index_bss == -1)
+ objfile->sect_index_bss = otherix;
+ }
else
section_data[otherix].ms_type = mst_unknown;
otherix++;