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dwarf_elf_begin: Add .gnu_debugaltlink to the sectiondata array

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And use it if DWZ mode is enabled.

Signed-off-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Florian Weimer
2014-04-15 14:04:19 +02:00
committed by Mark Wielaard
parent 9380297e13
commit efa72a02de
3 changed files with 24 additions and 18 deletions
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libdw/ChangeLog
+8
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@@ -1,3 +1,11 @@
2014-04-15 Florian Weimer <fweimer@redhat.com>
* libdwP.h (enum IDX_gnu_debugaltlink): New.
* dwarf_begin_elf.c (dwarf_scnnames): Increase string size and add
.gnu_debugaltlink.
(check_section): Obtain .gnu_debugaltlink section from the
setiondata array.
2014-04-11 Mark Wielaard <mjw@redhat.com>
* libdw.map (ELFUTILS_0.159): New. Add dwelf_elf_gnu_debuglink.
libdw/dwarf_begin_elf.c
+15 -18
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@@ -54,7 +54,7 @@
/* Section names. */
static const char dwarf_scnnames[IDX_last][17] =
static const char dwarf_scnnames[IDX_last][18] =
{
[IDX_debug_info] = ".debug_info",
[IDX_debug_types] = ".debug_types",
@@ -67,7 +67,8 @@ static const char dwarf_scnnames[IDX_last][17] =
[IDX_debug_str] = ".debug_str",
[IDX_debug_macinfo] = ".debug_macinfo",
[IDX_debug_macro] = ".debug_macro",
[IDX_debug_ranges] = ".debug_ranges"
[IDX_debug_ranges] = ".debug_ranges",
[IDX_gnu_debugaltlink] = ".gnu_debugaltlink"
};
#define ndwarf_scnnames (sizeof (dwarf_scnnames) / sizeof (dwarf_scnnames[0]))
@@ -223,22 +224,6 @@ check_section (Dwarf *result, GElf_Ehdr *ehdr, Elf_Scn *scn, bool inscngrp)
return NULL;
}
#ifdef ENABLE_DWZ
/* For dwz multifile support, ignore if it looks wrong. */
if (strcmp (scnname, ".gnu_debugaltlink") == 0)
{
Elf_Data *data = elf_getdata (scn, NULL);
if (data != NULL && data->d_size != 0)
{
const char *alt_name = data->d_buf;
const void *build_id = memchr (data->d_buf, '\0', data->d_size);
const int id_len = data->d_size - (build_id - data->d_buf + 1);
if (alt_name && build_id && id_len > 0)
return open_debugaltlink (result, alt_name, build_id + 1, id_len);
}
}
#endif /* ENABLE_DWZ */
/* Recognize the various sections. Most names start with .debug_. */
size_t cnt;
for (cnt = 0; cnt < ndwarf_scnnames; ++cnt)
@@ -334,6 +319,18 @@ check_section (Dwarf *result, GElf_Ehdr *ehdr, Elf_Scn *scn, bool inscngrp)
}
#endif
#ifdef ENABLE_DWZ
Elf_Data *data = result->sectiondata[IDX_gnu_debugaltlink];
if (data != NULL && data->d_size != 0)
{
const char *alt_name = data->d_buf;
const void *build_id = memchr (data->d_buf, '\0', data->d_size);
const int id_len = data->d_size - (build_id - data->d_buf + 1);
if (alt_name && build_id && id_len > 0)
return open_debugaltlink (result, alt_name, build_id + 1, id_len);
}
#endif /* ENABLE_DWZ */
return result;
}
libdw/libdwP.h
+1
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@@ -74,6 +74,7 @@ enum
IDX_debug_macinfo,
IDX_debug_macro,
IDX_debug_ranges,
IDX_gnu_debugaltlink,
IDX_last
};