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aix: implement TLS relocation for gas and ld

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Add support for TLS in XCOFF. Amongst the things done by this commit:
 - Update XCOFF auxialiary header to match new version and allow TLS
   sections.
 - Add TLS sections (.tdata and .tbss) support in gas and ld.
 - Add support for the TLS relocations in gas and ld.
   Two different types BFD_RELOC are created for PPC and PPC64 as
   the size is a pointer, thus distinct in 32 or 64bit.

The addresses given by ld to .tdata and .tbss is a bit special. In
XCOFF, these addresses are actually offsets from the TLS pointer
computed at runtime. AIX assembly and linker does the same. In
top of that, the .tdata must be before .data (this is mandatory for AIX
loader). Thus, the aix ld script is recomputing "." before .data to restore
its original value. There might be a simpler way, but this one is working.

Optimisation linked to TLS relocations aren't yet implemented.

bfd/
	* reloc.c (BFD_RELOC_PPC_TLS_LE, BFD_RELOC_PPC_TLS_IE,
	BFD_RELOC_PPC_TLS_M, BFD_RELOC_PPC_TLS_ML, BFD_RELOC_PPC64_TLS_GD,
	BFD_RELOC_PPC64_TLS_LD, BFD_RELOC_PPC64_TLS_LE,
	BFD_RELOC_PPC64_TLS_IE, BFD_RELOC_PPC64_TLS_M,
	BFD_RELOC_PPC64_TLS_ML): New relocations.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
	* coff-rs6000.c (xcoff_calculate_relocation): Call
	xcoff_reloc_type_tls for TLS relocations.
	(xcoff_howto_table): Implement TLS relocations.
	(_bfd_xcoff_reloc_type_lookup): Add cases TLS relocations.
	(xcoff_reloc_type_tls): New function.
	* coff64-rs6000.c (xcoff_calculate_relocation): Likewise.
	(xcoff_howto_table): Likewise.
	(_bfd_xcoff_reloc_type_lookup): Likewise.
	* coffcode.h (sec_to_styp_flags): Handle TLS sections.
	(styp_to_sec_flags): Likewise.
	(coff_compute_section_file_positions): Avoid file offset
	optimisation for .data when the previous section is .tdata.
	(coff_write_object_contents): Handle TLS sections.
	* coffswap.h (coff_swap_aouthdr_out): Add support for
	new fields in aouthdr.
	* libxcoff.h (xcoff_reloc_type_tls): Add prototype.
	* xcofflink.c (xcoff_link_add_symbols): Handle XMC_UL.
	(xcoff_need_ldrel_p): Add cases for TLS relocations.
	(xcoff_create_ldrel): Add l_symndx for TLS sections.
gas/
	* config/tc-ppc.c (ppc_xcoff_text_section, ppc_xcoff_data_section,
	(ppc_xcoff_bss_section, ppc_xcoff_tdata_section,
	(ppc_xcoff_tbss_section): New variables.
	(ppc_text_subsegment, ppc_text_csects, ppc_data_subgments,
	(ppc_data_csects): Removed.
	(ppc_xcoff_section_is_initialized, ppc_init_xcoff_section,
	ppc_xcoff_parse_cons): New functions.
	(md_being): Initialize XCOFF sections.
	(ppc_xcoff_suffix): Add support for TLS relocations
	(fixup_size, md_apply_fix): Add support for new BFD_RELOC.
	(ppc_change_csect): Handle XMC_TL, XMC_UL.  Correctly, add XMC_BS
	to .bss section.  Handle new XCOFF section variables.
	(ppc_comm): Likewise.
	(ppc_toc): Likewise.
	(ppc_symbol_new_hook): Likewise.
	(ppc_frob_symbol): Likewise.
	(ppc_fix_adjustable): Add tbss support.
	* config/tc-ppc.h (TC_PARSE_CONS_EXPRESSION): New define.
	(ppc_xcoff_parse_cons): Add prototype.
	(struct ppc_xcoff_section): New structure.
ld/
	* emultempl/aix.em: Ensure .tdata section is removed
	if empty, even with -r flag.
	* scripttempl/aix.sc: Handle TLS sections.
	* testsuite/ld-powerpc/aix52.exp: Add new tests.
	* testsuite/ld-powerpc/aix-tls-reloc-32.d: New test.
	* testsuite/ld-powerpc/aix-tls-reloc-64.d: New test.
	* testsuite/ld-powerpc/aix-tls-reloc.ex: New test.
	* testsuite/ld-powerpc/aix-tls-reloc.s: New test.
	* testsuite/ld-powerpc/aix-tls-section-32.d: New test.
	* testsuite/ld-powerpc/aix-tls-section-64.d: New test.
	* testsuite/ld-powerpc/aix-tls-section.ex: New test.
	* testsuite/ld-powerpc/aix-tls-section.s: New test.
include/
	* coff/internal.h (struct internal_aouthdr): Add new fields.
	* coff/rs6000.h (AOUTHDRÃ): Add new fields.
	* coff/rs6k64.h (struct external_filehdr): Likewise.
	* coff/xcoff.h (_TDATA), _TBSS): New defines
	(RS6K_AOUTHDR_TLS_LE, RS6K_AOUTHDR_RAS, RS6K_AOUTHDR_ALGNTDATA,
	RS6K_AOUTHDR_SHR_SYMTAB, RS6K_AOUTHDR_FORK_POLICY,
	RS6K_AOUTHDR_FORK_COR): New defines.
	(XMC_TU): Removed.
	(XMC_UL): New define.
This commit is contained in:
Clément Chigot
2021-03-11 11:08:19 +01:00
committed by Alan Modra
parent 4a403be0c1
commit 1b2cb8e2ee
30 changed files with 1037 additions and 131 deletions
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50
include/coff/rs6000.h
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@@ -48,28 +48,34 @@ struct external_filehdr {
typedef struct
{
unsigned char magic[2]; /* type of file */
unsigned char vstamp[2]; /* version stamp */
unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
unsigned char dsize[4]; /* initialized data " " */
unsigned char bsize[4]; /* uninitialized data " " */
unsigned char entry[4]; /* entry pt. */
unsigned char text_start[4]; /* base of text used for this file */
unsigned char data_start[4]; /* base of data used for this file */
unsigned char o_toc[4]; /* address of TOC */
unsigned char o_snentry[2]; /* section number of entry point */
unsigned char o_sntext[2]; /* section number of .text section */
unsigned char o_sndata[2]; /* section number of .data section */
unsigned char o_sntoc[2]; /* section number of TOC */
unsigned char o_snloader[2]; /* section number of .loader section */
unsigned char o_snbss[2]; /* section number of .bss section */
unsigned char o_algntext[2]; /* .text alignment */
unsigned char o_algndata[2]; /* .data alignment */
unsigned char o_modtype[2]; /* module type (??) */
unsigned char o_cputype[2]; /* cpu type */
unsigned char o_maxstack[4]; /* max stack size (??) */
unsigned char o_maxdata[4]; /* max data size (??) */
unsigned char o_resv2[12]; /* reserved */
unsigned char magic[2]; /* type of file */
unsigned char vstamp[2]; /* version stamp */
unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
unsigned char dsize[4]; /* initialized data " " */
unsigned char bsize[4]; /* uninitialized data " " */
unsigned char entry[4]; /* entry pt. */
unsigned char text_start[4]; /* base of text used for this file */
unsigned char data_start[4]; /* base of data used for this file */
unsigned char o_toc[4]; /* address of TOC */
unsigned char o_snentry[2]; /* section number of entry point */
unsigned char o_sntext[2]; /* section number of .text section */
unsigned char o_sndata[2]; /* section number of .data section */
unsigned char o_sntoc[2]; /* section number of TOC */
unsigned char o_snloader[2]; /* section number of .loader section */
unsigned char o_snbss[2]; /* section number of .bss section */
unsigned char o_algntext[2]; /* .text alignment */
unsigned char o_algndata[2]; /* .data alignment */
unsigned char o_modtype[2]; /* module type (??) */
unsigned char o_cputype[2]; /* cpu type */
unsigned char o_maxstack[4]; /* max stack size (??) */
unsigned char o_maxdata[4]; /* max data size (??) */
unsigned char o_debugger[4]; /* reserved */
unsigned char o_textpsize[1]; /* text page size */
unsigned char o_datapsize[1]; /* data page size */
unsigned char o_stackpsize[1]; /* stack page size */
unsigned char o_flags[1]; /* Flags and TLS alignment */
unsigned char o_sntdata[2]; /* section number of .tdata section */
unsigned char o_sntbss[2]; /* section number of .tbss section */
}
AOUTHDR;