X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=ld%2Fldlang.c;h=05ea0c881f825d12bd7cd0e3117fd8cf02c9f2a6;hb=d0801dd8f22a3e739c6a7d126d45829df981794d;hp=1a49f69d90800c6f9f54dc834b0aabf83db6dae1;hpb=a48931cc2df9f87596d93b319236c73ef0fe0f4e;p=deliverable%2Fbinutils-gdb.git diff --git a/ld/ldlang.c b/ld/ldlang.c index 1a49f69d90..05ea0c881f 100644 --- a/ld/ldlang.c +++ b/ld/ldlang.c @@ -19,12 +19,14 @@ MA 02110-1301, USA. */ #include "sysdep.h" +#include #include "bfd.h" #include "libiberty.h" #include "filenames.h" #include "safe-ctype.h" #include "obstack.h" #include "bfdlink.h" +#include "ctf-api.h" #include "ld.h" #include "ldmain.h" @@ -127,6 +129,7 @@ bfd_boolean delete_output_file_on_failure = FALSE; struct lang_phdr *lang_phdr_list; struct lang_nocrossrefs *nocrossref_list; struct asneeded_minfo **asneeded_list_tail; +static ctf_file_t *ctf_output; /* Functions that traverse the linker script and might evaluate DEFINED() need to increment this at the start of the traversal. */ @@ -150,6 +153,12 @@ int lang_statement_iteration = 0; #define SECTION_NAME_MAP_LENGTH (16) +/* CTF sections smaller than this are not compressed: compression of + dictionaries this small doesn't gain much, and this lets consumers mmap the + sections directly out of the ELF file and use them with no decompression + overhead if they want to. */ +#define CTF_COMPRESSION_THRESHOLD 4096 + void * stat_alloc (size_t size) { @@ -403,39 +412,50 @@ match_simple_wild (const char *pattern, const char *name) /* Return the numerical value of the init_priority attribute from section name NAME. */ -static unsigned long -get_init_priority (const char *name) +static int +get_init_priority (const asection *sec) { - char *end; - unsigned long init_priority; + const char *name = bfd_section_name (sec); + const char *dot; /* GCC uses the following section names for the init_priority - attribute with numerical values 101 and 65535 inclusive. A + attribute with numerical values 101 to 65535 inclusive. A lower value means a higher priority. - 1: .init_array.NNNN/.fini_array.NNNN: Where NNNN is the + 1: .init_array.NNNNN/.fini_array.NNNNN: Where NNNNN is the decimal numerical value of the init_priority attribute. The order of execution in .init_array is forward and .fini_array is backward. - 2: .ctors.NNNN/.dtors.NNNN: Where NNNN is 65535 minus the + 2: .ctors.NNNNN/.dtors.NNNNN: Where NNNNN is 65535 minus the decimal numerical value of the init_priority attribute. The order of execution in .ctors is backward and .dtors is forward. - */ - if (strncmp (name, ".init_array.", 12) == 0 - || strncmp (name, ".fini_array.", 12) == 0) - { - init_priority = strtoul (name + 12, &end, 10); - return *end ? 0 : init_priority; - } - else if (strncmp (name, ".ctors.", 7) == 0 - || strncmp (name, ".dtors.", 7) == 0) - { - init_priority = strtoul (name + 7, &end, 10); - return *end ? 0 : 65535 - init_priority; - } - return 0; + .init_array.NNNNN sections would normally be placed in an output + .init_array section, .fini_array.NNNNN in .fini_array, + .ctors.NNNNN in .ctors, and .dtors.NNNNN in .dtors. This means + we should sort by increasing number (and could just use + SORT_BY_NAME in scripts). However if .ctors.NNNNN sections are + being placed in .init_array (which may also contain + .init_array.NNNNN sections) or .dtors.NNNNN sections are being + placed in .fini_array then we need to extract the init_priority + attribute and sort on that. */ + dot = strrchr (name, '.'); + if (dot != NULL && ISDIGIT (dot[1])) + { + char *end; + unsigned long init_priority = strtoul (dot + 1, &end, 10); + if (*end == 0) + { + if (dot == name + 6 + && (strncmp (name, ".ctors", 6) == 0 + || strncmp (name, ".dtors", 6) == 0)) + init_priority = 65535 - init_priority; + if (init_priority <= INT_MAX) + return init_priority; + } + } + return -1; } /* Compare sections ASEC and BSEC according to SORT. */ @@ -444,7 +464,7 @@ static int compare_section (sort_type sort, asection *asec, asection *bsec) { int ret; - unsigned long ainit_priority, binit_priority; + int a_priority, b_priority; switch (sort) { @@ -452,11 +472,11 @@ compare_section (sort_type sort, asection *asec, asection *bsec) abort (); case by_init_priority: - ainit_priority = get_init_priority (bfd_section_name (asec)); - binit_priority = get_init_priority (bfd_section_name (bsec)); - if (ainit_priority == 0 || binit_priority == 0) + a_priority = get_init_priority (asec); + b_priority = get_init_priority (bsec); + if (a_priority < 0 || b_priority < 0) goto sort_by_name; - ret = ainit_priority - binit_priority; + ret = a_priority - b_priority; if (ret) break; else @@ -3420,11 +3440,18 @@ ldlang_open_output (lang_statement_union_type *statement) } static void -init_opb (void) +init_opb (asection *s) { - unsigned x = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, - ldfile_output_machine); + unsigned int x; + opb_shift = 0; + if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour + && s != NULL + && (s->flags & SEC_ELF_OCTETS) != 0) + return; + + x = bfd_arch_mach_octets_per_byte (ldfile_output_architecture, + ldfile_output_machine); if (x > 1) while ((x & 1) == 0) { @@ -3585,6 +3612,186 @@ open_input_bfds (lang_statement_union_type *s, enum open_bfd_mode mode) einfo ("%F"); } +/* Open the CTF sections in the input files with libctf: if any were opened, + create a fake input file that we'll write the merged CTF data to later + on. */ + +static void +ldlang_open_ctf (void) +{ + int any_ctf = 0; + int err; + + LANG_FOR_EACH_INPUT_STATEMENT (file) + { + asection *sect; + + /* Incoming files from the compiler have a single ctf_file_t in them + (which is presented to us by the libctf API in a ctf_archive_t + wrapper): files derived from a previous relocatable link have a CTF + archive containing possibly many CTF files. */ + + if ((file->the_ctf = ctf_bfdopen (file->the_bfd, &err)) == NULL) + { + if (err != ECTF_NOCTFDATA) + einfo (_("%P: warning: CTF section in `%pI' not loaded: " + "its types will be discarded: `%s'\n"), file, + ctf_errmsg (err)); + continue; + } + + /* Prevent the contents of this section from being written, while + requiring the section itself to be duplicated in the output. */ + /* This section must exist if ctf_bfdopen() succeeded. */ + sect = bfd_get_section_by_name (file->the_bfd, ".ctf"); + sect->size = 0; + sect->flags |= SEC_NEVER_LOAD | SEC_HAS_CONTENTS | SEC_LINKER_CREATED; + + any_ctf = 1; + } + + if (!any_ctf) + { + ctf_output = NULL; + return; + } + + if ((ctf_output = ctf_create (&err)) != NULL) + return; + + einfo (_("%P: warning: CTF output not created: `s'\n"), + ctf_errmsg (err)); + + LANG_FOR_EACH_INPUT_STATEMENT (errfile) + ctf_close (errfile->the_ctf); +} + +/* Merge together CTF sections. After this, only the symtab-dependent + function and data object sections need adjustment. */ + +static void +lang_merge_ctf (void) +{ + asection *output_sect; + + if (!ctf_output) + return; + + output_sect = bfd_get_section_by_name (link_info.output_bfd, ".ctf"); + + /* If the section was discarded, don't waste time merging. */ + if (output_sect == NULL) + { + ctf_file_close (ctf_output); + ctf_output = NULL; + + LANG_FOR_EACH_INPUT_STATEMENT (file) + { + ctf_close (file->the_ctf); + file->the_ctf = NULL; + } + return; + } + + LANG_FOR_EACH_INPUT_STATEMENT (file) + { + if (!file->the_ctf) + continue; + + /* Takes ownership of file->u.the_ctfa. */ + if (ctf_link_add_ctf (ctf_output, file->the_ctf, file->filename) < 0) + { + einfo (_("%F%P: cannot link with CTF in %pB: %s\n"), file->the_bfd, + ctf_errmsg (ctf_errno (ctf_output))); + ctf_close (file->the_ctf); + file->the_ctf = NULL; + continue; + } + } + + if (ctf_link (ctf_output, CTF_LINK_SHARE_UNCONFLICTED) < 0) + { + einfo (_("%F%P: CTF linking failed; output will have no CTF section: %s\n"), + ctf_errmsg (ctf_errno (ctf_output))); + if (output_sect) + { + output_sect->size = 0; + output_sect->flags |= SEC_EXCLUDE; + } + } +} + +/* Let the emulation examine the symbol table and strtab to help it optimize the + CTF, if supported. */ + +void +ldlang_ctf_apply_strsym (struct elf_sym_strtab *syms, bfd_size_type symcount, + struct elf_strtab_hash *symstrtab) +{ + ldemul_examine_strtab_for_ctf (ctf_output, syms, symcount, symstrtab); +} + +/* Write out the CTF section. Called early, if the emulation isn't going to + need to dedup against the strtab and symtab, then possibly called from the + target linker code if the dedup has happened. */ +static void +lang_write_ctf (int late) +{ + size_t output_size; + asection *output_sect; + + if (!ctf_output) + return; + + if (late) + { + /* Emit CTF late if this emulation says it can do so. */ + if (ldemul_emit_ctf_early ()) + return; + } + else + { + if (!ldemul_emit_ctf_early ()) + return; + } + + /* Emit CTF. */ + + output_sect = bfd_get_section_by_name (link_info.output_bfd, ".ctf"); + if (output_sect) + { + output_sect->contents = ctf_link_write (ctf_output, &output_size, + CTF_COMPRESSION_THRESHOLD); + output_sect->size = output_size; + output_sect->flags |= SEC_IN_MEMORY | SEC_KEEP; + + if (!output_sect->contents) + { + einfo (_("%F%P: CTF section emission failed; output will have no " + "CTF section: %s\n"), ctf_errmsg (ctf_errno (ctf_output))); + output_sect->size = 0; + output_sect->flags |= SEC_EXCLUDE; + } + } + + /* This also closes every CTF input file used in the link. */ + ctf_file_close (ctf_output); + ctf_output = NULL; + + LANG_FOR_EACH_INPUT_STATEMENT (file) + file->the_ctf = NULL; +} + +/* Write out the CTF section late, if the emulation needs that. */ + +void +ldlang_write_ctf_late (void) +{ + /* Trigger a "late call", if the emulation needs one. */ + + lang_write_ctf (1); +} + /* Add the supplied name to the symbol table as an undefined reference. This is a two step process as the symbol table doesn't even exist at the time the ld command line is processed. First we put the name @@ -4426,7 +4633,7 @@ print_input_section (asection *i, bfd_boolean is_discarded) int len; bfd_vma addr; - init_opb (); + init_opb (i); print_space (); minfo ("%s", i->name); @@ -4453,7 +4660,7 @@ print_input_section (asection *i, bfd_boolean is_discarded) size = 0; } - minfo ("0x%V %W %pB\n", addr, size, i->owner); + minfo ("0x%V %W %pB\n", addr, TO_ADDR (size), i->owner); if (size != i->rawsize && i->rawsize != 0) { @@ -4469,7 +4676,7 @@ print_input_section (asection *i, bfd_boolean is_discarded) --len; } - minfo (_("%W (size before relaxing)\n"), i->rawsize); + minfo (_("%W (size before relaxing)\n"), TO_ADDR (i->rawsize)); } if (i->output_section != NULL @@ -4507,7 +4714,7 @@ print_data_statement (lang_data_statement_type *data) bfd_size_type size; const char *name; - init_opb (); + init_opb (data->output_section); for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); @@ -4576,7 +4783,7 @@ print_reloc_statement (lang_reloc_statement_type *reloc) bfd_vma addr; bfd_size_type size; - init_opb (); + init_opb (reloc->output_section); for (i = 0; i < SECTION_NAME_MAP_LENGTH; i++) print_space (); @@ -4606,7 +4813,7 @@ print_padding_statement (lang_padding_statement_type *s) int len; bfd_vma addr; - init_opb (); + init_opb (s->output_section); minfo (" *fill*"); len = sizeof " *fill*" - 1; @@ -5076,6 +5283,7 @@ lang_check_section_addresses (void) for (p = NULL, i = 0; i < count; i++) { s = sections[i].sec; + init_opb (s); if ((s->flags & SEC_LOAD) != 0) { s_start = s->lma; @@ -5126,6 +5334,7 @@ lang_check_section_addresses (void) for (p = NULL, i = 0; i < count; i++) { s = sections[i].sec; + init_opb (s); s_start = s->vma; s_end = s_start + TO_ADDR (s->size) - 1; @@ -5250,6 +5459,7 @@ lang_size_sections_1 int section_alignment = 0; os = &s->output_section_statement; + init_opb (os->bfd_section); if (os->constraint == -1) break; @@ -5491,7 +5701,7 @@ lang_size_sections_1 /* Otherwise, keep the same lma to vma relationship as the previous section. */ else - lma = dot + last->lma - last->vma; + lma = os->bfd_section->vma + last->lma - last->vma; if (section_alignment > 0) lma = align_power (lma, section_alignment); @@ -5991,6 +6201,7 @@ lang_do_assignments_1 (lang_statement_union_type *s, os = &(s->output_section_statement); os->after_end = *found_end; + init_opb (os->bfd_section); if (os->bfd_section != NULL && !os->ignored) { if ((os->bfd_section->flags & SEC_ALLOC) != 0) @@ -7422,7 +7633,7 @@ lang_process (void) /* Open the output file. */ lang_for_each_statement (ldlang_open_output); - init_opb (); + init_opb (NULL); ldemul_create_output_section_statements (); @@ -7573,6 +7784,8 @@ lang_process (void) if (config.map_file != NULL) lang_print_asneeded (); + ldlang_open_ctf (); + bfd_section_already_linked_table_free (); /* Make sure that we're not mixing architectures. We call this @@ -7649,6 +7862,14 @@ lang_process (void) } } + /* Merge together CTF sections. After this, only the symtab-dependent + function and data object sections need adjustment. */ + lang_merge_ctf (); + + /* Emit the CTF, iff the emulation doesn't need to do late emission after + examining things laid out late, like the strtab. */ + lang_write_ctf (0); + /* Copy forward lma regions for output sections in same lma region. */ lang_propagate_lma_regions (); @@ -9052,14 +9273,16 @@ lang_print_memory_usage (void) for (r = lang_memory_region_list; r->next != NULL; r = r->next) { bfd_vma used_length = r->current - r->origin; - double percent; printf ("%16s: ",r->name_list.name); lang_print_memory_size (used_length); lang_print_memory_size ((bfd_vma) r->length); - percent = used_length * 100.0 / r->length; - - printf (" %6.2f%%\n", percent); + if (r->length != 0) + { + double percent = used_length * 100.0 / r->length; + printf (" %6.2f%%", percent); + } + printf ("\n"); } }