diff options
Diffstat (limited to 'bfd/som.c')
| -rw-r--r-- | bfd/som.c | 113 |
1 files changed, 106 insertions, 7 deletions
@@ -77,6 +77,10 @@ /* Max number of SOMs to be found in an archive. */ #define SOM_LST_MODULE_LIMIT 1024 +/* Generic alignment macro. */ +#define SOM_ALIGN(val, alignment) \ + (((val) + (alignment) - 1) & ~((alignment) - 1)) + /* SOM allows any one of the four previous relocations to be reused with a "R_PREV_FIXUP" relocation entry. Since R_PREV_FIXUP relocations are always a single byte, using a R_PREV_FIXUP instead @@ -2654,6 +2658,7 @@ som_begin_writing (abfd) asection *section; asymbol **syms = bfd_get_outsymbols (abfd); unsigned int total_subspaces = 0; + struct som_exec_auxhdr exec_header; /* The file header will always be first in an object file, everything else can be in random locations. To keep things @@ -2676,10 +2681,13 @@ som_begin_writing (abfd) if (abfd->flags & EXEC_P) { /* Parts of the exec header will be filled in later, so - delay writing the header itself. Just leave space for - it. */ - current_offset += sizeof (struct som_exec_auxhdr); - obj_som_file_hdr (abfd)->aux_header_size += sizeof (struct som_exec_auxhdr); + delay writing the header itself. Fill in the defaults, + and write it later. */ + current_offset += sizeof (exec_header); + obj_som_file_hdr (abfd)->aux_header_size += sizeof (exec_header); + memset (&exec_header, 0, sizeof (exec_header)); + exec_header.som_auxhdr.type = HPUX_AUX_ID; + exec_header.som_auxhdr.length = 40; } if (obj_som_version_hdr (abfd) != NULL) { @@ -2841,32 +2849,73 @@ som_begin_writing (abfd) obj_som_file_hdr (abfd)->compiler_location = current_offset; obj_som_file_hdr (abfd)->compiler_total = 0; - /* Now compute the file positions for the loadable subspaces. */ + /* Now compute the file positions for the loadable subspaces, taking + care to make sure everything stays properly aligned. */ section = abfd->sections; for (i = 0; i < num_spaces; i++) { asection *subsection; + int first_subspace; /* Find a space. */ while (som_section_data (section)->is_space == 0) section = section->next; + first_subspace = 1; /* Now look for all its subspaces. */ for (subsection = abfd->sections; subsection != NULL; subsection = subsection->next) { - + if (som_section_data (subsection)->is_subspace == 0 || som_section_data (subsection)->containing_space != section || (subsection->flags & SEC_ALLOC) == 0) continue; + /* If this is the first subspace in the space, and we are + building an executable, then take care to make sure all + the alignments are correct and update the exec header. */ + if (first_subspace + && (abfd->flags & EXEC_P)) + { + /* Demand paged executables have each space aligned to a + page boundary. Sharable executables (write-protected + text) have just the private (aka data & bss) space aligned + to a page boundary. */ + if (abfd->flags & D_PAGED + || ((abfd->flags & WP_TEXT) + && (subsection->flags & SEC_DATA))) + current_offset = SOM_ALIGN (current_offset, PA_PAGESIZE); + + /* Update the exec header. */ + if (subsection->flags & SEC_CODE && exec_header.exec_tfile == 0) + { + exec_header.exec_tmem = section->vma; + exec_header.exec_tfile = current_offset; + } + if (subsection->flags & SEC_DATA && exec_header.exec_dfile == 0) + { + exec_header.exec_dmem = section->vma; + exec_header.exec_dfile = current_offset; + } + + /* Only do this for the first subspace within each space. */ + first_subspace = 0; + } + som_section_data (subsection)->subspace_index = total_subspaces++; /* This is real data to be loaded from the file. */ if (subsection->flags & SEC_LOAD) { + /* Update the size of the code & data. */ + if (abfd->flags & EXEC_P + && subsection->flags & SEC_CODE) + exec_header.exec_tsize += subsection->_cooked_size; + else if (abfd->flags & EXEC_P + && subsection->flags & SEC_DATA) + exec_header.exec_dsize += subsection->_cooked_size; som_section_data (subsection)->subspace_dict.file_loc_init_value = current_offset; section->filepos = current_offset; @@ -2875,6 +2924,10 @@ som_begin_writing (abfd) /* Looks like uninitialized data. */ else { + /* Update the size of the bss section. */ + if (abfd->flags & EXEC_P) + exec_header.exec_bsize += subsection->_cooked_size; + som_section_data (subsection)->subspace_dict.file_loc_init_value = 0; som_section_data (subsection)->subspace_dict. @@ -2885,7 +2938,12 @@ som_begin_writing (abfd) section = section->next; } - /* Finally compute the file positions for unloadable subspaces. */ + /* Finally compute the file positions for unloadable subspaces. + If building an executable, start the unloadable stuff on its + own page. */ + + if (abfd->flags & EXEC_P) + current_offset = SOM_ALIGN (current_offset, PA_PAGESIZE); obj_som_file_hdr (abfd)->unloadable_sp_location = current_offset; section = abfd->sections; @@ -2897,6 +2955,8 @@ som_begin_writing (abfd) while (som_section_data (section)->is_space == 0) section = section->next; + current_offset = SOM_ALIGN (current_offset, PA_PAGESIZE); + /* Now look for all its subspaces. */ for (subsection = abfd->sections; subsection != NULL; @@ -2930,6 +2990,22 @@ som_begin_writing (abfd) section = section->next; } + /* If building an executable, then make sure to seek to and write + one byte at the end of the file to make sure any necessary + zeros are filled in. Ugh. */ + if (abfd->flags & EXEC_P) + current_offset = SOM_ALIGN (current_offset, PA_PAGESIZE); + if (bfd_seek (abfd, current_offset, SEEK_SET) < 0) + { + bfd_set_error (bfd_error_system_call); + return false; + } + if (bfd_write ((PTR) "", 1, 1, abfd) != 1) + { + bfd_set_error (bfd_error_system_call); + return false; + } + obj_som_file_hdr (abfd)->unloadable_sp_size = current_offset - obj_som_file_hdr (abfd)->unloadable_sp_location; @@ -2939,6 +3015,29 @@ som_begin_writing (abfd) /* Done. Store the total size of the SOM. */ obj_som_file_hdr (abfd)->som_length = current_offset; + + /* Now write the exec header. */ + if (abfd->flags & EXEC_P) + { + long tmp; + + /* Oh joys. Ram some of the BSS data into the DATA section + to be compatable with how the hp linker makes objects + (saves memory space). */ + tmp = exec_header.exec_dsize; + tmp = SOM_ALIGN (tmp, PA_PAGESIZE); + exec_header.exec_bsize -= (tmp - exec_header.exec_dsize); + exec_header.exec_dsize = tmp; + + bfd_seek (abfd, obj_som_file_hdr (abfd)->aux_header_location, SEEK_SET); + + if (bfd_write ((PTR) &exec_header, AUX_HDR_SIZE, 1, abfd) + != AUX_HDR_SIZE) + { + bfd_set_error (bfd_error_system_call); + return false; + } + } return true; } |