X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=bfd%2Felf32-tilepro.c;h=dfb93ff55c46269f0ff59259c5709b177c3dc9d7;hb=c88960d081f0b37ec03c66a13115e2a68e40d1ad;hp=cbb65c6b1a48405fe14ad2492ec3c5404b666b51;hpb=9637f6ef78ecc63d9fca3ccffe825fb8e908a575;p=deliverable%2Fbinutils-gdb.git diff --git a/bfd/elf32-tilepro.c b/bfd/elf32-tilepro.c index cbb65c6b1a..dfb93ff55c 100644 --- a/bfd/elf32-tilepro.c +++ b/bfd/elf32-tilepro.c @@ -1,5 +1,5 @@ /* TILEPro-specific support for 32-bit ELF. - Copyright 2011, 2012 Free Software Foundation, Inc. + Copyright (C) 2011-2016 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. @@ -34,11 +34,11 @@ static reloc_howto_type tilepro_elf_howto_table [] = /* This reloc does nothing. */ HOWTO (R_TILEPRO_NONE, /* type */ 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ + 3, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ + complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_TILEPRO_NONE", /* name */ FALSE, /* partial_inplace */ @@ -737,6 +737,16 @@ struct _bfd_tilepro_elf_obj_tdata && elf_tdata (bfd) != NULL \ && elf_object_id (bfd) == TILEPRO_ELF_DATA) +/* Allocate TILEPro ELF private object data. */ + +static bfd_boolean +tilepro_elf_mkobject (bfd *abfd) +{ + return bfd_elf_allocate_object (abfd, + sizeof (struct _bfd_tilepro_elf_obj_tdata), + TILEPRO_ELF_DATA); +} + #include "elf/common.h" #include "elf/internal.h" @@ -764,7 +774,7 @@ tilepro_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, { unsigned int i; - for (i = ARRAY_SIZE (tilepro_reloc_map); --i;) + for (i = ARRAY_SIZE (tilepro_reloc_map); i--;) { const reloc_map * entry; @@ -934,11 +944,11 @@ tilepro_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) return FALSE; /* pr_cursig */ - elf_tdata (abfd)->core_signal = + elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + TILEPRO_PRSTATUS_OFFSET_PR_CURSIG); /* pr_pid */ - elf_tdata (abfd)->core_pid = + elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + TILEPRO_PRSTATUS_OFFSET_PR_PID); /* pr_reg */ @@ -956,11 +966,11 @@ tilepro_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) if (note->descsz != TILEPRO_PRPSINFO_SIZEOF) return FALSE; - elf_tdata (abfd)->core_program + elf_tdata (abfd)->core->program = _bfd_elfcore_strndup (abfd, note->descdata + TILEPRO_PRPSINFO_OFFSET_PR_FNAME, 16); - elf_tdata (abfd)->core_command + elf_tdata (abfd)->core->command = _bfd_elfcore_strndup (abfd, note->descdata + TILEPRO_PRPSINFO_OFFSET_PR_PSARGS, ELF_PR_PSARGS_SIZE); @@ -970,7 +980,7 @@ tilepro_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) onto the end of the args in some (at least one anyway) implementations, so strip it off if it exists. */ { - char *command = elf_tdata (abfd)->core_command; + char *command = elf_tdata (abfd)->core->command; int n = strlen (command); if (0 < n && command[n - 1] == ' ') @@ -1298,11 +1308,11 @@ tilepro_elf_create_dynamic_sections (bfd *dynobj, return FALSE; htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); - if (!info->shared) + if (!bfd_link_pic (info)) htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss - || (!info->shared && !htab->srelbss)) + || (!bfd_link_pic (info) && !htab->srelbss)) abort (); return TRUE; @@ -1444,7 +1454,7 @@ static int tilepro_elf_tls_transition (struct bfd_link_info *info, int r_type, int is_local) { - if (info->shared) + if (bfd_link_pic (info)) return r_type; if (is_local) @@ -1469,7 +1479,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sreloc; int num_relocs; - if (info->relocatable) + if (bfd_link_relocatable (info)) return TRUE; htab = tilepro_elf_hash_table (info); @@ -1511,6 +1521,10 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; } r_type = tilepro_elf_tls_transition (info, r_type, h == NULL); @@ -1524,7 +1538,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, case R_TILEPRO_IMM16_X1_TLS_LE_HI: case R_TILEPRO_IMM16_X0_TLS_LE_HA: case R_TILEPRO_IMM16_X1_TLS_LE_HA: - if (info->shared) + if (bfd_link_pic (info)) goto r_tilepro_plt32; break; @@ -1536,7 +1550,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, case R_TILEPRO_IMM16_X1_TLS_GD_HI: case R_TILEPRO_IMM16_X0_TLS_GD_HA: case R_TILEPRO_IMM16_X1_TLS_GD_HA: - BFD_ASSERT (info->shared); + BFD_ASSERT (bfd_link_pic (info)); tls_type = GOT_TLS_GD; goto have_got_reference; @@ -1549,7 +1563,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, case R_TILEPRO_IMM16_X0_TLS_IE_HA: case R_TILEPRO_IMM16_X1_TLS_IE_HA: tls_type = GOT_TLS_IE; - if (info->shared) + if (bfd_link_pic (info)) info->flags |= DF_STATIC_TLS; goto have_got_reference; @@ -1634,7 +1648,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, break; case R_TILEPRO_TLS_GD_CALL: - if (info->shared) + if (bfd_link_pic (info)) { /* These are basically R_TILEPRO_JOFFLONG_X1_PLT relocs against __tls_get_addr. */ @@ -1723,7 +1737,7 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, h->non_got_ref = 1; r_tilepro_plt32: - if (h != NULL && !info->shared) + if (h != NULL && !bfd_link_pic (info)) { /* We may need a .plt entry if the function this reloc refers to is in a shared lib. */ @@ -1751,14 +1765,14 @@ tilepro_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, may need to keep relocations for symbols satisfied by a dynamic library if we manage to avoid copy relocs for the symbol. */ - if ((info->shared + if ((bfd_link_pic (info) && (sec->flags & SEC_ALLOC) != 0 && (! tilepro_elf_howto_table[r_type].pc_relative || (h != NULL && (! info->symbolic || h->root.type == bfd_link_hash_defweak || !h->def_regular)))) - || (!info->shared + || (!bfd_link_pic (info) && (sec->flags & SEC_ALLOC) != 0 && h != NULL && (h->root.type == bfd_link_hash_defweak @@ -1858,11 +1872,33 @@ tilepro_elf_gc_mark_hook (asection *sec, if (h != NULL) { switch (ELF32_R_TYPE (rel->r_info)) - { - case R_TILEPRO_GNU_VTINHERIT: - case R_TILEPRO_GNU_VTENTRY: - break; - } + { + case R_TILEPRO_GNU_VTINHERIT: + case R_TILEPRO_GNU_VTENTRY: + return NULL; + } + } + + /* FIXME: The test here, in check_relocs and in relocate_section + dealing with TLS optimization, ought to be !bfd_link_executable (info). */ + if (bfd_link_pic (info)) + { + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_TILEPRO_TLS_GD_CALL: + /* This reloc implicitly references __tls_get_addr. We know + another reloc will reference the same symbol as the one + on this reloc, so the real symbol and section will be + gc marked when processing the other reloc. That lets + us handle __tls_get_addr here. */ + h = elf_link_hash_lookup (elf_hash_table (info), "__tls_get_addr", + FALSE, FALSE, TRUE); + BFD_ASSERT (h != NULL); + h->mark = 1; + if (h->u.weakdef != NULL) + h->u.weakdef->mark = 1; + sym = NULL; + } } return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); @@ -1879,7 +1915,7 @@ tilepro_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, bfd_signed_vma *local_got_refcounts; const Elf_Internal_Rela *rel, *relend; - if (info->relocatable) + if (bfd_link_relocatable (info)) return TRUE; BFD_ASSERT (is_tilepro_elf (abfd) || sec->reloc_count == 0); @@ -2012,7 +2048,7 @@ tilepro_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, case R_TILEPRO_SHAMT_X1: case R_TILEPRO_SHAMT_Y0: case R_TILEPRO_SHAMT_Y1: - if (info->shared) + if (bfd_link_pic (info)) break; /* Fall through. */ @@ -2102,7 +2138,7 @@ tilepro_elf_adjust_dynamic_symbol (struct bfd_link_info *info, only references to the symbol are via the global offset table. For such cases we need not do anything here; the relocations will be handled correctly by relocate_section. */ - if (info->shared) + if (bfd_link_pic (info)) return TRUE; /* If there are no references to this symbol that do not use the @@ -2153,7 +2189,7 @@ tilepro_elf_adjust_dynamic_symbol (struct bfd_link_info *info, h->needs_copy = 1; } - return _bfd_elf_adjust_dynamic_copy (h, htab->sdynbss); + return _bfd_elf_adjust_dynamic_copy (info, h, htab->sdynbss); } /* Allocate space in .plt, .got and associated reloc sections for @@ -2186,7 +2222,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) return FALSE; } - if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), h)) { asection *s = htab->elf.splt; @@ -2203,7 +2239,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) location in the .plt. This is required to make function pointers compare as equal between the normal executable and the shared library. */ - if (! info->shared + if (! bfd_link_pic (info) && !h->def_regular) { h->root.u.def.section = s; @@ -2234,7 +2270,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) /* If a TLS_IE symbol is now local to the binary, make it a TLS_LE requiring no TLS entry. */ if (h->got.refcount > 0 - && !info->shared + && !bfd_link_pic (info) && h->dynindx == -1 && tilepro_elf_hash_entry(h)->tls_type == GOT_TLS_IE) h->got.offset = (bfd_vma) -1; @@ -2265,7 +2301,9 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) global. */ if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE) htab->elf.srelgot->size += 2 * TILEPRO_ELF_RELA_BYTES; - else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)) + else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, + bfd_link_pic (info), + h)) htab->elf.srelgot->size += TILEPRO_ELF_RELA_BYTES; } else @@ -2281,7 +2319,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) space for pc-relative relocs that have become local due to symbol visibility changes. */ - if (info->shared) + if (bfd_link_pic (info)) { if (SYMBOL_CALLS_LOCAL (info, h)) { @@ -2425,7 +2463,7 @@ tilepro_elf_size_dynamic_sections (bfd *output_bfd, if (elf_hash_table (info)->dynamic_sections_created) { /* Set the contents of the .interp section to the interpreter. */ - if (info->executable) + if (bfd_link_executable (info) && !info->nointerp) { s = bfd_get_linker_section (dynobj, ".interp"); BFD_ASSERT (s != NULL); @@ -2436,7 +2474,7 @@ tilepro_elf_size_dynamic_sections (bfd *output_bfd, /* Set up .got offsets for local syms, and space for local dynamic relocs. */ - for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) { bfd_signed_vma *local_got; bfd_signed_vma *end_local_got; @@ -2490,7 +2528,7 @@ tilepro_elf_size_dynamic_sections (bfd *output_bfd, s->size += TILEPRO_BYTES_PER_WORD; if (*local_tls_type == GOT_TLS_GD) s->size += TILEPRO_BYTES_PER_WORD; - if (info->shared + if (bfd_link_pic (info) || *local_tls_type == GOT_TLS_GD || *local_tls_type == GOT_TLS_IE) srel->size += TILEPRO_ELF_RELA_BYTES; @@ -2602,7 +2640,7 @@ tilepro_elf_size_dynamic_sections (bfd *output_bfd, #define add_dynamic_entry(TAG, VAL) \ _bfd_elf_add_dynamic_entry (info, TAG, VAL) - if (info->executable) + if (bfd_link_executable (info)) { if (!add_dynamic_entry (DT_DEBUG, 0)) return FALSE; @@ -2856,12 +2894,13 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, } else { - bfd_boolean warned; + bfd_boolean warned ATTRIBUTE_UNUSED; + bfd_boolean ignored ATTRIBUTE_UNUSED; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, - unresolved_reloc, warned); + unresolved_reloc, warned, ignored); if (warned) { /* To avoid generating warning messages about truncated @@ -2878,7 +2917,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, rel, 1, relend, howto, 0, contents); - if (info->relocatable) + if (bfd_link_relocatable (info)) continue; if (h != NULL) @@ -2909,8 +2948,8 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, else if (h != NULL) tls_type = tilepro_elf_hash_entry(h)->tls_type; - is_tls_iele = (! info->shared || tls_type == GOT_TLS_IE); - is_tls_le = is_tls_iele && (!info->shared + is_tls_iele = (! bfd_link_pic (info) || tls_type == GOT_TLS_IE); + is_tls_le = is_tls_iele && (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)); if (r_type == R_TILEPRO_TLS_GD_CALL) @@ -2987,7 +3026,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, } break; case R_TILEPRO_TLS_IE_LOAD: - if (!info->shared && (h == NULL || h->dynindx == -1)) + if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1)) /* IE -> LE */ tilepro_replace_insn (contents + rel->r_offset, insn_mask_X1_no_dest_no_srca, @@ -3026,8 +3065,10 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, BFD_ASSERT (off != (bfd_vma) -1); dyn = elf_hash_table (info)->dynamic_sections_created; - if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) - || (info->shared + if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, + bfd_link_pic (info), + h) + || (bfd_link_pic (info) && SYMBOL_REFERENCES_LOCAL (info, h))) { /* This is actually a static link, or it is a @@ -3068,7 +3109,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, off &= ~1; else { - if (info->shared) + if (bfd_link_pic (info)) { asection *s; Elf_Internal_Rela outrel; @@ -3092,7 +3133,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, local_got_offsets[r_symndx] |= 1; } } - relocation = htab->elf.sgot->output_offset + off - got_base; + relocation = off - got_base; break; case R_TILEPRO_JOFFLONG_X1_PLT: @@ -3167,13 +3208,13 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, if ((input_section->flags & SEC_ALLOC) == 0) break; - if ((info->shared + if ((bfd_link_pic (info) && (h == NULL || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT || h->root.type != bfd_link_hash_undefweak) && (! howto->pc_relative || !SYMBOL_CALLS_LOCAL (info, h))) - || (!info->shared + || (!bfd_link_pic (info) && h != NULL && h->dynindx != -1 && !h->non_got_ref @@ -3225,7 +3266,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, else if (h != NULL && h->dynindx != -1 && (! is_plt - || !info->shared + || !bfd_link_pic (info) || !SYMBOLIC_BIND (info, h) || !h->def_regular)) { @@ -3308,7 +3349,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, case R_TILEPRO_IMM16_X1_TLS_LE_HI: case R_TILEPRO_IMM16_X0_TLS_LE_HA: case R_TILEPRO_IMM16_X1_TLS_LE_HA: - if (info->shared) + if (bfd_link_pic (info)) { Elf_Internal_Rela outrel; bfd_boolean skip; @@ -3363,7 +3404,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, else if (h != NULL) { tls_type = tilepro_elf_hash_entry(h)->tls_type; - if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) + if (!bfd_link_pic (info) && h->dynindx == -1 && tls_type == GOT_TLS_IE) r_type = tilepro_tls_translate_to_le (r_type); } if (tls_type == GOT_TLS_IE) @@ -3413,8 +3454,10 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, bfd_boolean dyn; dyn = htab->elf.dynamic_sections_created; - if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) - && (!info->shared + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, + bfd_link_pic (info), + h) + && (!bfd_link_pic (info) || !SYMBOL_REFERENCES_LOCAL (info, h))) { indx = h->dynindx; @@ -3423,7 +3466,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, /* The GOT entries have not been initialized yet. Do it now, and emit any relocations. */ - if ((info->shared || indx != 0) + if ((bfd_link_pic (info) || indx != 0) && (h == NULL || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT || h->root.type != bfd_link_hash_undefweak)) @@ -3511,7 +3554,7 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, if (off >= (bfd_vma) -2) abort (); - relocation = htab->elf.sgot->output_offset + off - got_base; + relocation = off - got_base; unresolved_reloc = FALSE; howto = tilepro_elf_howto_table + r_type; break; @@ -3614,15 +3657,14 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, switch (r) { case bfd_reloc_overflow: - r = info->callbacks->reloc_overflow + (*info->callbacks->reloc_overflow) (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); break; case bfd_reloc_undefined: - r = info->callbacks->undefined_symbol - (info, name, input_bfd, input_section, rel->r_offset, - TRUE); + (*info->callbacks->undefined_symbol) + (info, name, input_bfd, input_section, rel->r_offset, TRUE); break; case bfd_reloc_outofrange: @@ -3643,11 +3685,8 @@ tilepro_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, } if (msg) - r = info->callbacks->warning - (info, msg, name, input_bfd, input_section, rel->r_offset); - - if (! r) - return FALSE; + (*info->callbacks->warning) (info, msg, name, input_bfd, + input_section, rel->r_offset); } } @@ -3746,7 +3785,7 @@ tilepro_elf_finish_dynamic_symbol (bfd *output_bfd, the symbol was forced to be local because of a version file. The entry in the global offset table will already have been initialized in the relocate_section function. */ - if (info->shared + if (bfd_link_pic (info) && (info->symbolic || h->dynindx == -1) && h->def_regular) { @@ -3873,8 +3912,9 @@ tilepro_elf_finish_dynamic_sections (bfd *output_bfd, PLT_ENTRY_SIZE - PLT_HEADER_SIZE); } - elf_section_data (splt->output_section)->this_hdr.sh_entsize - = PLT_ENTRY_SIZE; + if (elf_section_data (splt->output_section) != NULL) + elf_section_data (splt->output_section)->this_hdr.sh_entsize + = PLT_ENTRY_SIZE; } if (htab->elf.sgotplt) @@ -3932,7 +3972,9 @@ tilepro_elf_plt_sym_val (bfd_vma i, const asection *plt, } static enum elf_reloc_type_class -tilepro_reloc_type_class (const Elf_Internal_Rela *rela) +tilepro_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, + const asection *rel_sec ATTRIBUTE_UNUSED, + const Elf_Internal_Rela *rela) { switch ((int) ELF32_R_TYPE (rela->r_info)) { @@ -3981,7 +4023,7 @@ tilepro_additional_program_headers (bfd *abfd, #define ELF_MAXPAGESIZE 0x10000 #define ELF_COMMONPAGESIZE 0x10000 -#define TARGET_LITTLE_SYM bfd_elf32_tilepro_vec +#define TARGET_LITTLE_SYM tilepro_elf32_vec #define TARGET_LITTLE_NAME "elf32-tilepro" #define elf_backend_reloc_type_class tilepro_reloc_type_class @@ -4008,6 +4050,8 @@ tilepro_additional_program_headers (bfd *abfd, #define elf_backend_grok_psinfo tilepro_elf_grok_psinfo #define elf_backend_additional_program_headers tilepro_additional_program_headers +#define bfd_elf32_mkobject tilepro_elf_mkobject + #define elf_backend_init_index_section _bfd_elf_init_1_index_section #define elf_backend_can_gc_sections 1