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* section.c (bfd_get_section_contents): Return zero filled buffer

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if section has no contents.
This commit is contained in:
Peter Schauer 1993-12-30 15:51:16 +00:00
parent f161923490
commit 1adbf66264
2 changed files with 38 additions and 27 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
Thu Dec 30 07:41:36 1993 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
* section.c (bfd_get_section_contents): Return zero filled buffer
if section has no contents.
Tue Dec 28 12:43:54 1993 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* elf.c (bfd_elf_generic_reloc): If this is not an inplace reloc,

60
bfd/section.c
View file

@ -39,7 +39,7 @@ SECTION
INODE
Section Input, Section Output, Sections, Sections
SUBSECTION
Section Input
Section input
When a BFD is opened for reading, the section structures are
created and attached to the BFD.
@ -73,7 +73,7 @@ INODE
Section Output, typedef asection, Section Input, Sections
SUBSECTION
Section Output
Section output
To write a new object style BFD, the various sections to be
written have to be created. They are attached to the BFD in
@ -114,7 +114,7 @@ SUBSECTION
SUBSECTION
Seclets
The data within a section is stored in a <<seclet>>. These
The data within a section is stored in a @dfn{seclet}. These
are much like the fixups in <<gas>>. The seclet abstraction
allows a section to grow and shrink within itself.
@ -420,10 +420,9 @@ DOCDD
INODE
section prototypes, , typedef asection, Sections
SUBSECTION
section prototypes
Section prototypes
These are the functions exported by the section handling part of
<<libbfd>>.
These are the functions exported by the section handling part of BFD.
*/
/*
@ -434,13 +433,13 @@ SYNOPSIS
asection *bfd_get_section_by_name(bfd *abfd, CONST char *name);
DESCRIPTION
Run through the provided @var{abfd} and return the one of the
<<asection>>s whose name matches @var{name}, otherwise NULL.
Run through @var{abfd} and return the one of the
<<asection>>s whose name matches @var{name}, otherwise <<NULL>>.
@xref{Sections}, for more information.
This should only be used in special cases; the normal way to process
all sections of a given name is to use bfd_map_over_sections and
strcmp on the name (or better yet, base it on the section flags
all sections of a given name is to use <<bfd_map_over_sections>> and
<<strcmp>> on the name (or better yet, base it on the section flags
or something else) for each section.
*/
@ -468,16 +467,16 @@ DESCRIPTION
Create a new empty section called @var{name}
and attach it to the end of the chain of sections for the
BFD @var{abfd}. An attempt to create a section with a name which
is already in use, returns its pointer without changing the
is already in use returns its pointer without changing the
section chain.
It has the funny name since this is the way it used to be
before it was rewritten....
Possible errors are:
o invalid_operation -
o <<invalid_operation>> -
If output has already started for this BFD.
o no_memory -
o <<no_memory>> -
If obstack alloc fails.
*/
@ -508,9 +507,9 @@ DESCRIPTION
the chain of sections for @var{abfd}. Create a new section even if there
is already a section with that name.
Returns NULL and sets bfd_error on error; possible errors are:
o invalid_operation - If output has already started for @var{abfd}.
o no_memory - If obstack alloc fails.
Return <<NULL>> and set <<bfd_error>> on error; possible errors are:
o <<invalid_operation>> - If output has already started for @var{abfd}.
o <<no_memory>> - If obstack alloc fails.
*/
sec_ptr
@ -578,10 +577,10 @@ SYNOPSIS
asection *bfd_make_section(bfd *, CONST char *name);
DESCRIPTION
Like <<bfd_make_section_anyway>>, but return NULL (without setting
Like <<bfd_make_section_anyway>>, but return <<NULL>> (without setting
bfd_error) without changing the section chain if there is already a
section named @var{name}. If there is an error, return NULL and set
bfd_error.
section named @var{name}. If there is an error, return <<NULL>> and set
<<bfd_error>>.
*/
sec_ptr
@ -628,10 +627,10 @@ SYNOPSIS
DESCRIPTION
Set the attributes of the section @var{sec} in the BFD
@var{abfd} to the value @var{flags}. Returns <<true>> on success,
@var{abfd} to the value @var{flags}. Return <<true>> on success,
<<false>> on error. Possible error returns are:
o invalid operation -
o <<invalid_operation>> -
The section cannot have one or more of the attributes
requested. For example, a .bss section in <<a.out>> may not
have the <<SEC_HAS_CONTENTS>> field set.
@ -719,8 +718,8 @@ DESCRIPTION
ok, then <<true>> is returned, else <<false>>.
Possible error returns:
o invalid_operation -
Writing has started to the BFD, so setting the size is invalid
o <<invalid_operation>> -
Writing has started to the BFD, so setting the size is invalid.
*/
@ -767,7 +766,7 @@ DESCRIPTION
Normally <<true>> is returned, else <<false>>. Possible error
returns are:
o no_contents -
o <<no_contents>> -
The output section does not have the <<SEC_HAS_CONTENTS>>
attribute, so nothing can be written to it.
o and some more too
@ -854,9 +853,10 @@ DESCRIPTION
offset of @var{offset} from the start of the input section,
and is read for @var{count} bytes.
If the contents of a constuctor with the <<SEC_CONSTUCTOR>>
flag set are requested, then the @var{location} is filled with
zeroes. If no errors occur, <<true>> is returned, else
If the contents of a constructor with the <<SEC_CONSTRUCTOR>>
flag set are requested or if the section does not have the
<<SEC_HAS_CONTENTS>> flag set, then the @var{location} is filled
with zeroes. If no errors occur, <<true>> is returned, else
<<false>>.
@ -894,6 +894,12 @@ DEFUN(bfd_get_section_contents,(abfd, section, location, offset, count),
/* Don't bother. */
return true;
if ((section->flags & SEC_HAS_CONTENTS) == 0)
{
memset(location, 0, (unsigned)count);
return true;
}
return BFD_SEND (abfd, _bfd_get_section_contents,
(abfd, section, location, offset, count));
}