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* som.c (som_begin_writing): New approach at dealing with holes

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in executables left by the HP linker.  Does not rely on subspace
        alignments as subspaces are *NOT* guaranteed to be properly
        aligned in an executable (can you believe that!).
This commit is contained in:
Jeff Law
1994-03-31 06:50:42 +00:00
parent bfb089946f
commit 06e6eb0e53
2 changed files with 34 additions and 18 deletions
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7
bfd/ChangeLog
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@ -155,6 +155,13 @@ Mon Mar 28 12:53:27 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* aoutx.h (translate_from_native_sym_flags): Set SEC_RELOC flag * aoutx.h (translate_from_native_sym_flags): Set SEC_RELOC flag
for generated constructor section. for generated constructor section.
Sun Mar 27 16:25:22 1994 Jeffrey A. Law (law@snake.cs.utah.edu)
* som.c (som_begin_writing): New approach at dealing with holes
in executables left by the HP linker. Does not rely on subspace
alignments as subspaces are *NOT* guaranteed to be properly
aligned in an executable (can you believe that!).
Sat Mar 26 10:25:43 1994 Jeffrey A. Law (law@snake.cs.utah.edu) Sat Mar 26 10:25:43 1994 Jeffrey A. Law (law@snake.cs.utah.edu)
* som.c (som_get_section_contents): New function. Do not try * som.c (som_get_section_contents): New function. Do not try

45
bfd/som.c
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@ -2922,6 +2922,7 @@ som_begin_writing (abfd)
{ {
asection *subsection; asection *subsection;
int first_subspace; int first_subspace;
unsigned int subspace_offset = 0;
/* Find a space. */ /* Find a space. */
while (!som_is_space (section)) while (!som_is_space (section))
@ -2970,31 +2971,38 @@ som_begin_writing (abfd)
exec_header.exec_dfile = current_offset; exec_header.exec_dfile = current_offset;
} }
/* Keep track of exactly where we are within a particular
space. This is necessary as the braindamaged HPUX
loader will create holes between subspaces *and*
subspace alignments are *NOT* preserved. What a crock. */
subspace_offset = subsection->vma;
/* Only do this for the first subspace within each space. */ /* Only do this for the first subspace within each space. */
first_subspace = 0; first_subspace = 0;
} }
else if (abfd->flags & EXEC_P) else if (abfd->flags & EXEC_P)
{ {
/* Have to keep proper alignments for the subspaces /* The braindamaged HPUX loader may have created a hole
in executables too! */ between two subspaces. It is *not* sufficient to use
the alignment specifications within the subspaces to
account for these holes -- I've run into at least one
case where the loader left one code subspace unaligned
in a final executable.
To combat this we keep a current offset within each space,
and use the subspace vma fields to detect and preserve
holes. What a crock!
ps. This is not necessary for unloadable space/subspaces. */
current_offset += subsection->vma - subspace_offset;
if (subsection->flags & SEC_CODE) if (subsection->flags & SEC_CODE)
{ exec_header.exec_tsize += subsection->vma - subspace_offset;
unsigned tmp = exec_header.exec_tsize;
tmp = SOM_ALIGN (tmp, 1 << subsection->alignment_power);
current_offset += (tmp - exec_header.exec_tsize);
exec_header.exec_tsize = tmp;
}
else else
{ exec_header.exec_dsize += subsection->vma - subspace_offset;
unsigned tmp = exec_header.exec_dsize; subspace_offset += subsection->vma - subspace_offset;
tmp = SOM_ALIGN (tmp, 1 << subsection->alignment_power);
current_offset += (tmp - exec_header.exec_dsize);
exec_header.exec_dsize = tmp;
}
} }
subsection->target_index = total_subspaces++; subsection->target_index = total_subspaces++;
/* This is real data to be loaded from the file. */ /* This is real data to be loaded from the file. */
if (subsection->flags & SEC_LOAD) if (subsection->flags & SEC_LOAD)
@ -3008,8 +3016,9 @@ som_begin_writing (abfd)
exec_header.exec_dsize += subsection->_cooked_size; exec_header.exec_dsize += subsection->_cooked_size;
som_section_data (subsection)->subspace_dict->file_loc_init_value som_section_data (subsection)->subspace_dict->file_loc_init_value
= current_offset; = current_offset;
section->filepos = current_offset; subsection->filepos = current_offset;
current_offset += bfd_section_size (abfd, subsection); current_offset += bfd_section_size (abfd, subsection);
subspace_offset += bfd_section_size (abfd, subsection);
} }
/* Looks like uninitialized data. */ /* Looks like uninitialized data. */
else else
@ -3065,7 +3074,7 @@ som_begin_writing (abfd)
{ {
som_section_data (subsection)->subspace_dict->file_loc_init_value som_section_data (subsection)->subspace_dict->file_loc_init_value
= current_offset; = current_offset;
section->filepos = current_offset; subsection->filepos = current_offset;
current_offset += bfd_section_size (abfd, subsection); current_offset += bfd_section_size (abfd, subsection);
} }
/* Looks like uninitialized data. */ /* Looks like uninitialized data. */