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This commit moves all aarch64-specific code to deal with CIE structure
introduced in 3a67e1a6b4430374f3073e51bb19347d4c421cfe from
target-independent files to the aarch64 backend.
2018-12-13 Sam Tebbs <sam.tebbs@arm.com>
binutils/
* dwarf.c (read_cie): Add check for 'B'.
gas/
* config/tc-aarch64.h (enum pointer_auth_key,
tc_fde_entry_extras, tc_cie_entry_extras, tc_fde_entry_init_extra,
tc_output_cie_extra, tc_cie_fde_equivalent_extra,
tc_cie_entry_init_extra): Define.
* dw2gencfi.c (struct cie_entry): Add tc_cie_entry_extras invocation.
(alloc_fde_entry, select_cie_for_fde): Add tc_fde_entry_init_extra
invocation.
(output_cie): Add tc_output_cie_extra invocation.
(select_cie_for_fde): Add tc_cie_fde_equivalent_extra invocation.
* dw2gencfi.h (enum pointer_auth_key): Move to config/tc-aarch64.h.
(struct fde_entry): Add tc_fde_entry_extras invocation
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Armv8.3-A has another key used in pointer authentication called the
B-key (other than the A-key that is already supported). In order for
stack unwinders to work it is necessary to be able to identify frames
that have been signed with the B-key rather than the A-key and it was
felt that keeping this as an augmentation character in the CIE was the
best bet. The DWARF extensions for ARM therefore propose to add a new
augmentation character 'B' to the CIE augmentation string and the
corresponding cfi directive ".cfi_b_key_frame". I've made the relevant
changes to GAS and LD to add support for B-key unwinding, which required
modifying LD to check for 'B' in the augmentation string, adding the
".cfi_b_key_frame" directive to GAS and adding a "pauth_key" field to
GAS's fde_entry and cie_entry structs.
The pointer authentication instructions will behave as NOPs on
architectures that don't support them, and so a check for the
architecture being assembled for is not necessary since there will be no
behavioural difference between augmentation strings with and without the
'B' character on such architectures.
2018-12-05 Sam Tebbs <sam.tebbs@arm.com>
bfd/
* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Add check for 'B'.
gas/
* dw2gencfi.c (struct cie_entry): Add tc_cie_entry_extras invocation.
(alloc_fde_entry): Add tc_fde_entry_init_extra invocation.
(output_cie): Add tc_output_cie_extra invocation.
(select_cie_for_fde): Add tc_cie_fde_equivalent_extra and
tc_cie_entry_init_extra invocation.
(frch_cfi_data, cfa_save_data): Move to dwgencfi.h.
* config/tc-aarch64.c (s_aarch64_cfi_b_key_frame): Declare.
(md_pseudo_table): Add "cfi_b_key_frame".
* config/tc-aarch64.h (tc_fde_entry_extras, tc_cie_entry_extras,
tc_fde_entry_init_extra, tc_output_cie_extra,
tc_cie_fde_equivalent_extra, tc_cie_entry_init_extra): Define.
* dw2gencfi.h (struct fde_entry): Add tc_fde_entry_extras invocation.
(pointer_auth_key): Define.
(frch_cfi_data, cfa_save_data): Move from dwgencfi.c.
* doc/c-aarch64.texi (.cfi_b_key_frame): Add documentation.
* testsuite/gas/aarch64/(pac_ab_key.d, pac_ab_key.s): New file.
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This patch adds support for .cfi_val_offset GAS pseudo command which
maps to DW_CFA_val_offset and DW_CFA_val_offset_sf.
gas/ChangeLog:
2016-09-29 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* doc/as.texinfo: Add docu for .cfi_val_offset.
* dw2gencfi.c (cfi_add_CFA_val_offset): New function.
(dot_cfi): Add case for DW_CFA_val_offset.
(output_cfi_insn): Likewise.
(cfi_pseudo_table): Add entry for cfi_val_offset.
* dw2gencfi.h: Add prototype for cfi_add_CFA_val_offset.
* testsuite/gas/cfi/cfi-common-8.d: New test.
* testsuite/gas/cfi/cfi-common-8.s: New test.
* testsuite/gas/cfi/cfi.exp: Run cfi-common-8 testcase.
binutils/ChangeLog:
2016-09-29 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* dwarf.c (display_debug_frames): Adjust output line.
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The specification for the Compact EH format is available at:
https://github.com/MentorEmbedded/cxx-abi/blob/master/MIPSCompactEH.pdf
2015-05-28 Catherine Moore <clm@codesourcery.com>
Bernd Schmidt <bernds@codesourcery.com>
Paul Brook <paul@codesourcery.com>
bfd/
* bfd-in2.h: Regenerated.
* elf-bfd.h (DWARF2_EH_HDR, COMPACT_EH_HDR): Define.
(COMPACT_EH_CANT_UNWIND_OPCODE): Define.
(dwarf_eh_frame_hdr_info): Move dwarf-specific fields from
eh_frame_hdr_info.
(compact_eh_frame_hdr_info): Declare.
(eh_frame_hdr_info): Redeclare with union for dwarf-specific
fields and compact-eh fields.
(elf_backend_data): Add cant_unwind_opcode and compact_eh_encoding.
(bfd_elf_section_data): Add eh_frame_entry_field.
(elf_section_eh_frame_entry): Define.
(bfd_elf_parse_eh_frame_entries): Declare.
(_bfd_elf_parse_eh_frame_entry): Declare.
(_bfd_elf_end_eh_frame_parsing): Declare.
(_bfd_elf_write_section_eh_frame_entry): Declare.
(_bfd_elf_eh_frame_entry_present): Declare.
(_bfd_elf_section_for_symbol): Declare.
* elf-eh-frame.c (bfd_elf_discard_eh_frame_entry): New function.
(bfd_elf_record_eh_frame_entry): New function.
(_bfd_elf_parse_eh_frame_entry): New function.
(_bfd_elf_parse_eh_frame): Update hdr_info field references.
(cmp_eh_frame_hdr): New function.
(add_eh_frame_hdr_terminator): New function.
(_bfd_elf_end_eh_frame_parsing): New function.
(find_merged_cie): Update hdr_info field references.
(_bfd_elf_discard_section_eh_frame): Likewise.
(_bfd_elf_discard_section_eh_frame_hdr): Add Compact EH support.
(_bfd_elf_eh_frame_entry_present): New function.
(_bfd_elf_maybe_strip_eh_frame_hdr): Add Compact EH support.
(_bfd_elf_write_section_eh_frame_entry): New function.
(_bfd_elf_write_section_eh_frame): Update hdr_info field references.
(_bfd_elf_fixup_eh_frame_hdr): New function.
(write_compact_eh_frame_hdr): New function.
(write_dwarf_eh_frame_hdr): New function.
(_bfd_elf_write_section_eh_frame_hdr): Add Compact EH support.
* elflink.c (_bfd_elf_section_for_symbol): New function.
(elf_section_ignore_discarded_relocs): Add Compact EH support.
(elf_link_input_bfd): Likewise.
(bfd_elf_final_link): Likewise.
(_bfd_elf_gc_mark): Likewise.
(bfd_elf_parse_eh_frame_entries): New function.
(bfd_elf_gc_sections): Add Compact EH support.
(bfd_elf_discard_info): Likewise.
* elfxx-mips.c: Include dwarf2.h.
(_bfd_mips_elf_compact_eh_encoding): New function.
(_bfd_mips_elf_cant_unwind_opcode): New function.
* elfxx-mips.h (_bfd_mips_elf_compact_eh_encoding): Declare.
(_bfd_mips_elf_cant_unwind_opcode): Declare.
(elf_backend_compact_eh_encoding): Define.
(elf_backend_cant_unwind_opcode): Define.
* elfxx-target.h (elf_backend_compact_eh_encoding): Provide default.
(elf_backend_cant_unwind_opcode): Provide default.
(elf_backend_data elfNN_bed): Add elf_backend_compact_eh_encoding and
elf_backend_cant_unwind_opcode.
* section.c (SEC_INFO_TYPE_EH_FRAME_ENTRY): Add definition.
gas/
* config/tc-alpha.c (all_cfi_sections): Declare.
(s_alpha_ent): Initialize all_cfi_sections.
(alpha_elf_md_end): Invoke cfi_set_sections.
* config/tc-mips.c (md_apply_fix): Handle BFD_RELOC_NONE.
(s_ehword): Use BFD_RELOC_32_PCREL.
(mips_fix_adjustable): Handle BFD_RELOC_32_PCREL.
(mips_cfi_reloc_for_encoding): New function.
* tc-mips.h (DWARF2_FDE_RELOC_SIZE): Redefine.
(DWARF2_FDE_RELOC_ENCODING): Define.
(tc_cfi_reloc_for_encoding): Define.
(mips_cfi_reloc_for_encoding): Define.
(tc_compact_eh_opcode_stop): Define.
(tc_compact_eh_opcode_pad): Define.
* doc/as.texinfo: Document Compact EH extensions.
* doc/internals.texi: Likewise.
* dw2gencfi.c (EH_FRAME_LINKONCE): Redefine.
(tc_cfi_reloc_for_encoding): Provide default.
(compact_eh): Declare.
(emit_expr_encoded): New function.
(get_debugseg_name): Add Compact EH support.
(alloc_debugseg_item): Likewise.
(cfi_set_sections): New function.
(dot_cfi_fde_data): New function.
(dot_cfi_personality_id): New function.
(dot_cfi_inline_lsda): New function.
(cfi_pseudo_table): Add cfi_fde_data, cfi_personality_id,
and cfi_inline_lsda.
(dot_cfi_personality): Add Compact EH support.
(dot_cfi_lsda): Likewise.
(dot_cfi_sections): Likewise.
(dot_cfi_startproc): Likewise.
(get_cfi_seg): Likewise.
(output_compact_unwind_data): New function.
(output_cfi_insn): Add Compact EH support.
(output_cie): Likewise.
(output_fde): Likewise.
(cfi_finish): Likewise.
(cfi_emit_eh_header): New function.
(output_eh_header): New function.
* dw2gencfi.h (cfi_set_sections): Declare.
(SUPPORT_COMPACT_EH): Define.
(MULTIPLE_FRAME_SECTIONS): Define.
New enumeration to describe the Compact EH header format.
(fde_entry): Add new fields personality_id, eh_header_type, eh_data_size,
eh_data, eh_loc and sections.
(CFI_EMIT_eh_frame, CFI_EMIT_debug_frame, CFI_EMIT_target,
CFI_EMIT_eh_frame_compact): Define.
2015-05-22 Catherine Moore <clm@codesourcery.com>
Bernd Schmidt <bernds@codesourcery.com>
gas/testsuite/
* gas/mips/mips.exp: Run new tests.
* gas/mips/compact-eh-1.s: New file.
* gas/mips/compact-eh-2.s: New file.
* gas/mips/compact-eh-3.s: New file.
* gas/mips/compact-eh-4.s: New file.
* gas/mips/compact-eh-5.s: New file.
* gas/mips/compact-eh-6.s: New file.
* gas/mips/compact-eh-7.s: New file.
* gas/mips/compact-eh-eb-1.d: New file.
* gas/mips/compact-eh-eb-2.d: New file.
* gas/mips/compact-eh-eb-3.d: New file.
* gas/mips/compact-eh-eb-4.d: New file.
* gas/mips/compact-eh-eb-5.d: New file.
* gas/mips/compact-eh-eb-6.d: New file.
* gas/mips/compact-eh-eb-7.d: New file.
* gas/mips/compact-eh-el-1.d: New file.
* gas/mips/compact-eh-el-2.d: New file.
* gas/mips/compact-eh-el-3.d: New file.
* gas/mips/compact-eh-el-4.d: New file.
* gas/mips/compact-eh-el-5.d: New file.
* gas/mips/compact-eh-el-6.d: New file.
* gas/mips/compact-eh-el-7.d: New file.
* gas/mips/compact-eh-err1.l: New file.
* gas/mips/compact-eh-err1.s: New file.
* gas/mips/compact-eh-err2.l: New file.
* gas/mips/compact-eh-err2.s: New file.
2015-05-22 Catherine Moore <clm@codesourcery.com>
include/
* bfdlink.h: Rename eh_frame_hdr to eh_frame_hdr_type.
2015-05-22 Catherine Moore <clm@codesourcery.com>
Paul Brook <paul@codesourcery.com>
ld/
* emultempl/elf32.em (gld${EMULATION_NAME}_after_open):
Add Compact EH support.
* scripttempl/elf.sc: Handle .eh_frame_entry and .gnu_extab
sections.
2015-05-22 Catherine Moore <clm@codesourcery.com>
ld/testsuite/
* ld-mips-elf/compact-eh.ld: New linker script.
* ld-mips-elf/compact-eh1.d: New.
* ld-mips-elf/compact-eh1.s: New.
* ld-mips-elf/compact-eh1a.s: New.
* ld-mips-elf/compact-eh1b.s: New.
* ld-mips-elf/compact-eh2.d: New.
* ld-mips-elf/compact-eh2.s: New.
* ld-mips-elf/compact-eh3.d: New.
* ld-mips-elf/compact-eh3.s: New.
* ld-mips-elf/compact-eh3a.s: New.
* ld-mips-elf/compact-eh4.d: New.
* ld-mips-elf/compact-eh5.d: New.
* ld-mips-elf/compact-eh6.d: New.
* ld-mips-elf/mips-elf.exp: Run new tests.
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When runtime patching code (like e.g. done by the Linux kernel) there
may be cases where the set of stack frame alterations differs between
unpatched and patched code. Consequently the corresponding unwind data
needs patching too. Locating the right places within an FDE, however,
is rather cumbersome without a way to insert labels in the resulting
section. Hence this patch introduces a new directive, .cfi_label. Note
that with the way CFI data gets emitted currently (at the end of the
assembly process) this can't support local FB- and dollar-labels.
gas/
2015-01-12 Jan Beulich <jbeulich@suse.com>
* gas/dw2gencfi.c (cfi_add_label, dot_cfi_label): New.
(cfi_pseudo_table): Add "cfi_label".
(output_cfi_insn): Handle CFI_label.
(select_cie_for_fde): Als terminate CIE when encountering
CFI_label.
* dw2gencfi.h (cfi_add_label): Declare.
(struct cfi_insn_data): New member "sym_name".
(CFI_label): New.
* read.c (read_symbol_name): Drop "static".
* read.h (read_symbol_name): Declare.
gas/testsuite/
2015-01-12 Jan Beulich <jbeulich@suse.com>
gas/cfi/cfi-label.d, gas/cfi/cfi-label.s: New.
gas/cfi/cfi.exp: Run new tests.
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* dw2gencfi.h (all_fde_data): Declare.
* config/tc-alpha.c (alpha_elf_md_end): Don't convert legacy unwind
info to cfi unwind info if the user already has supplied some.
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bfd/
* elf32-tic6x.c (is_tic6x_elf_unwind_section_name,
elf32_tic6x_fake_sections): New functions.
(elf_backend_fake_sections): Define.
gas/
* config/tc-tic6x.c (streq): Define.
(tic6x_get_unwind): New.
(s_tic6x_cantunwind, s_tic6x_handlerdata, s_tic6x_endp,
s_tic6x_personalityindex, s_tic6x_personality): New functions.
(md_pseudo_table): Add "endp", "handlerdata", "personalityindex",
"personality" and "cantunwind".
(tic6x_regname_to_dw2regnum, tic6x_frame_initial_instructions,
tic6x_start_unwind_section, tic6x_unwind_frame_regs,
tic6x_pop_rts_offset_little, tic6x_pop_rts_offset_big,
tic6x_unwind_reg_from_dwarf, tic6x_flush_unwind_word,
tic6x_unwind_byte, tic6x_unwind_2byte, tic6x_unwind_uleb,
tic6x_cfi_startproc, output_exidx_entry, tic6x_output_unwinding,
tic6x_cfi_endproc): New.
* config/tc-tic6x.h (TIC6X_NUM_UNWIND_REGS): Define.
(tic6x_unwind_info): New.
(tic6x_segment_info_type): Add marked_pr_dependency, unwind and
text_unwind.
(TARGET_USE_CFIPOP, tc_regname_to_dw2regnum,
tc_cfi_frame_initial_instructions, DWARF2_DEFAULT_RETURN_COLUMN,
DWARF2_CIE_DATA_ALIGNMENT, tc_cfi_startproc, tc_cfi_endproc,
tc_cfi_section_name): Define.
* doc/c-tic6x.texi: Document new unwinding directives.
* dw2gencfi.c (tc_cfi_startproc, tc_cfi_endproc): Add default
definitions.
(cfi_insn_data, fde_entry, CFI_adjust_cfa_offset, CFI_return_column,
CFI_rel_offset, CFI_escape, CFI_signal_frame, CFI_val_encoded_addr):
Move to dw2gencfi.h.
(CFI_EMIT_target): Define.
(dot_cfi_sections): Check tc_cfi_section_name.
(dot_cfi_startproc): Use tc_cfi_startproc.
(dot_cfi_endproc): Use tc_cfi_endproc.
* dw2gencfi.h (cfi_insn_data, fde_entry, CFI_adjust_cfa_offset,
CFI_return_column, CFI_rel_offset, CFI_escape, CFI_signal_frame,
CFI_val_encoded_addr): Move to here from dw2gencfi.c.
gas/testsuite:
* gas/tic6x/unwind-1.d: New test.
* gas/tic6x/unwind-1.s: New test.
* gas/tic6x/unwind-2.d: New test.
* gas/tic6x/unwind-2.s: New test.
* gas/tic6x/unwind-3.d: New test.
* gas/tic6x/unwind-3.s: New test.
* gas/tic6x/unwind-bad-1.d: New test.
* gas/tic6x/unwind-bad-1.s: New test.
* gas/tic6x/unwind-bad-1.l: New test.
* gas/tic6x/unwind-bad-2.d: New test.
* gas/tic6x/unwind-bad-2.s: New test.
* gas/tic6x/unwind-bad-2.l: New test.
include/
* elf/tic6x.h (ELF_STRING_C6000_unwind,
ELF_STRING_C6000_unwind_info, ELF_STRING_C6000_unwind_once,
ELF_STRING_C6000_unwind_info_once): Define.
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* Makefile.am (dwarf2.lo): Use dwarf2.h, not elf/dwarf2.h.
(elf-eh-frame.lo): Likewise.
(elf32-bfin.lo): Likewise.
(elf32-frv.lo): Likewise.
(elf32-xc16x.lo): Likewise.
* Makefile.in: Rebuild.
* dwarf2.c: Included dwarf.h, not elf/dwarf2.h.
* elf-eh-frame.c: Likewise.
* elf32-bfin.c: Likewise.
* elf32-frv.c: Likewise.
* elf32-xc16x.c: Likewise.
binutils
* Makefile.am (dwarf.o): Refer to dwarf2.h, not elf/dwarf2.h.
* Makefile.in: Rebuild.
* dwarf.c: Include dwarf2.h, not elf/dwarf2.h.
gas
* Makefile.am (DEPTC_alpha_ecoff): Refer to dwarf2.h, not
elf/dwarf2.h.
(DEPTC_alpha_elf): Likewise.
(DEPTC_alpha_evax): Likewise.
(DEPTC_arm_elf): Likewise.
(DEPTC_hppa_elf): Likewise.
(DEPTC_i386_aout): Likewise.
(DEPTC_i386_coff): Likewise.
(DEPTC_i386_elf): Likewise.
(DEPTC_m68k_aout): Likewise.
(DEPTC_m68k_coff): Likewise.
(DEPTC_m68k_elf): Likewise.
(DEPTC_mips_coff): Likewise.
(DEPTC_mips_ecoff): Likewise.
(DEPTC_mips_elf): Likewise.
(DEPTC_ppc_coff): Likewise.
(DEPTC_ppc_elf): Likewise.
(DEPTC_s390_elf): Likewise.
(DEPTC_sh_coff): Likewise.
(DEPTC_sh_elf): Likewise.
(DEPTC_sh64_elf): Likewise.
(DEPTC_sparc_aout): Likewise.
(DEPTC_sparc_coff): Likewise.
(DEPTC_sparc_elf): Likewise.
(as.o): Likewise.
(dwarf2dbg.o): Likewise.
(dw2gencfi.o): Likewise.
(ehopt.o): Likewise.
(read.o): Likewise.
* Makefile.in: Rebuild.
* dw2gencfi.h: Include dwarf2.h, not elf/dwarf2.h.
* dwarf2dbg.c: Likewise.
* ehopt.c: Likewise.
gdb
* dwarf2-frame.c: Include dwarf2.h, not elf/dwarf2.h.
* dwarf2expr.c: Likewise.
* dwarf2loc.c: Likewise.
* dwarf2read.c: Likewise.
* sh-tdep.c: Likewise.
* xtensa-tdep.c: Likewise.
include
* dwarf2.h: New file, moved from elf/.
include/elf
* dwarf2.h: Move to `..'.
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(cfi_add_CFA_nop): Remove.
(CFI_escape, dot_cfi_escape): New.
(dot_cfi): Remove nop.
(cfi_pseudo_table): Remove nop; add escape.
(output_cfi_insn): Likewise.
(select_cie_for_fde): Stop on escape.
* dw2gencfi.h (cfi_add_CFA_nop): Remove.
* read.c, read.h (do_parse_cons_expression): New.
* doc/as.texinfo (.cfi_escape): New.
* gas/cfi/cfi-common-3.[ds]: New.
* gas/cfi/cfi.exp: Run it.
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* dw2gencfi.c (cfi_add_CFA_insn, cfi_add_CFA_insn_reg)
(cfi_add_CFA_insn_reg_reg, cfi_add_CFA_insn_reg_offset): New.
(cfi_add_CFA_offset, cfi_add_CFA_def_cfa)
(cfi_add_CFA_register, cfi_add_CFA_def_cfa_register)
(cfi_add_CFA_def_cfa_offset): Use cfi_add_CFA_insn_*().
(cfi_add_CFA_restore, cfi_add_CFA_undefined)
(cfi_add_CFA_same_value, cfi_add_CFA_remember_state)
(cfi_add_CFA_restore_state, cfi_add_CFA_nop): New.
(cfi_pseudo_table): New directives .cfi_return_column,
.cfi_restore, .cfi_undefined, .cfi_same_value,
.cfi_remember_state, .cfi_restore_state, .cfi_nop.
(dot_cfi, output_cfi_insn): Handle new directives.
* dw2gencfi.h (cfi_add_CFA_restore, cfi_add_CFA_undefined)
(cfi_add_CFA_same_value, cfi_add_CFA_remember_state)
(cfi_add_CFA_restore_state, cfi_add_CFA_nop): New prototypes.
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* as.c (main): Always call cfi_finish.
* config/tc-i386.c (x86_dwarf2_return_column): New.
(x86_cie_data_alignment): New.
(md_begin): Set them.
(tc_x86_cfi_init): Remove.
(tc_x86_regname_to_dw2regnum): Fix 32-bit register numbers;
return int, not unsigned long; don't as_bad here.
(tc_x86_frame_initial_instructions): Streamline; use
updated api.
* config/tc-i386.h (tc_cfi_init): Remove.
(DWARF2_DEFAULT_RETURN_COLUMN): New.
(DWARF2_CIE_DATA_ALIGNMENT): New.
* gas/cfi/cfi-i386.d: Update for dw2gencfi rewrite.
* gas/cfi/cfi-x86_64.d: Likewise.
* gas/cfi/cfi-i386-2.d: New.
* gas/cfi/cfi-i386-2.s: New.
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* config/tc-i386.c (tc_x86_cfi_init): New function.
* config/tc-i386.h (TARGET_USE_CFIPOP, tc_cfi_init): New defines.
* as.c (parse_args): Set verbose flag on --verbose.
(main): Call tc_cfi_init()/cfi_finish().
* as.h (verbose): New external variable.
* read.c (pobegin): Insert CFI pops to the list.
* symbols.c (local_symbol_make): Make symbol external.
* symbols.h (local_symbol_make): New prototype.
* Makefile.am: Add dw2gencfi.[ch] files. Run "make dep-am".
* Makefile.in: Regenerate.
* doc/as.texinfo: Added node "CFI directives" with description of
all implemented .cfi_* directives.
* doc/Makefile.in: Regenerate.
* po/POTFILES.in: Regenerate.
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