aix: implement TLS relocation for gas and ld

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.

30 files changed, 1039 insertions, 133 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index d955f78..6d61abe 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,34 @@
 2021-03-12  Clément Chigot  <clement.chigot@atos.net>
 
+	* 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.
+
+2021-03-12  Clément Chigot  <clement.chigot@atos.net>
+
 	* reloc.c (BFD_RELOC_PPC_TOC16_HI, BFD_RELOC_PPC_TOC16_LO):
 	New relocations.
 	* bfd-in2.h: Regenerate.
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 9bd61b1..54c1c9a 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -3003,6 +3003,10 @@ instruction.  */
   BFD_RELOC_PPC_TLS,
   BFD_RELOC_PPC_TLSGD,
   BFD_RELOC_PPC_TLSLD,
+  BFD_RELOC_PPC_TLSLE,
+  BFD_RELOC_PPC_TLSIE,
+  BFD_RELOC_PPC_TLSM,
+  BFD_RELOC_PPC_TLSML,
   BFD_RELOC_PPC_DTPMOD,
   BFD_RELOC_PPC_TPREL16,
   BFD_RELOC_PPC_TPREL16_LO,
@@ -3030,6 +3034,12 @@ instruction.  */
   BFD_RELOC_PPC_GOT_DTPREL16_LO,
   BFD_RELOC_PPC_GOT_DTPREL16_HI,
   BFD_RELOC_PPC_GOT_DTPREL16_HA,
+  BFD_RELOC_PPC64_TLSGD,
+  BFD_RELOC_PPC64_TLSLD,
+  BFD_RELOC_PPC64_TLSLE,
+  BFD_RELOC_PPC64_TLSIE,
+  BFD_RELOC_PPC64_TLSM,
+  BFD_RELOC_PPC64_TLSML,
   BFD_RELOC_PPC64_TPREL16_DS,
   BFD_RELOC_PPC64_TPREL16_LO_DS,
   BFD_RELOC_PPC64_TPREL16_HIGH,
diff --git a/bfd/coff-rs6000.c b/bfd/coff-rs6000.c
index b77ff0c..a29cf5b 100644
--- a/bfd/coff-rs6000.c
+++ b/bfd/coff-rs6000.c
@@ -190,12 +190,12 @@ xcoff_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION] =
   xcoff_reloc_type_fail, /*           (0x1d) */
   xcoff_reloc_type_fail, /*           (0x1e) */
   xcoff_reloc_type_fail, /*           (0x1f) */
-  xcoff_reloc_type_fail, /* R_TLS     (0x20) */
-  xcoff_reloc_type_fail, /* R_TLS_IE  (0x21) */
-  xcoff_reloc_type_fail, /* R_TLS_LD  (0x22) */
-  xcoff_reloc_type_fail, /* R_TLS_LE  (0x23) */
-  xcoff_reloc_type_fail, /* R_TLSM    (0x24) */
-  xcoff_reloc_type_fail, /* R_TLSML   (0x25) */
+  xcoff_reloc_type_tls,  /* R_TLS     (0x20) */
+  xcoff_reloc_type_tls,  /* R_TLS_IE  (0x21) */
+  xcoff_reloc_type_tls,  /* R_TLS_LD  (0x22) */
+  xcoff_reloc_type_tls,  /* R_TLS_LE  (0x23) */
+  xcoff_reloc_type_tls,  /* R_TLSM    (0x24) */
+  xcoff_reloc_type_tls,  /* R_TLSML   (0x25) */
   xcoff_reloc_type_fail, /*           (0x26) */
   xcoff_reloc_type_fail, /*           (0x27) */
   xcoff_reloc_type_fail, /*           (0x28) */
@@ -1064,22 +1064,95 @@ reloc_howto_type xcoff_howto_table[] =
   EMPTY_HOWTO (0x1f),
 
   /* 0x20: General-dynamic TLS relocation.  */
-  EMPTY_HOWTO (R_TLS),
+  HOWTO (R_TLS,			/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x21: Initial-exec TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_IE),
+  HOWTO (R_TLS_IE,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_IE",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x22: Local-dynamic TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_LD),
+  HOWTO (R_TLS_LD,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_LD",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x23: Local-exec TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_LE),
+  HOWTO (R_TLS_LE,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_LE",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x24: TLS relocation.  */
-  EMPTY_HOWTO(R_TLSM),
+  HOWTO (R_TLSM,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLSM",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
+
 
   /* 0x25: TLS module relocation.  */
-  EMPTY_HOWTO(R_TLSML),
+  HOWTO (R_TLSML,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLSM",		/* name */
+	 TRUE,			/* partial_inplace */
+	 0xffffffff,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   EMPTY_HOWTO(0x26),
   EMPTY_HOWTO(0x27),
@@ -1180,6 +1253,18 @@ _bfd_xcoff_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
       return &xcoff_howto_table[0];
     case BFD_RELOC_NONE:
       return &xcoff_howto_table[0xf];
+    case BFD_RELOC_PPC_TLSGD:
+      return &xcoff_howto_table[0x20];
+    case BFD_RELOC_PPC_TLSIE:
+      return &xcoff_howto_table[0x21];
+    case BFD_RELOC_PPC_TLSLD:
+      return &xcoff_howto_table[0x22];
+    case BFD_RELOC_PPC_TLSLE:
+      return &xcoff_howto_table[0x23];
+    case BFD_RELOC_PPC_TLSM:
+      return &xcoff_howto_table[0x24];
+    case BFD_RELOC_PPC_TLSML:
+      return &xcoff_howto_table[0x25];
     default:
       return NULL;
     }
@@ -3127,6 +3212,88 @@ xcoff_reloc_type_crel (bfd *input_bfd ATTRIBUTE_UNUSED,
   return TRUE;
 }
 
+bfd_boolean
+xcoff_reloc_type_tls (bfd *input_bfd ATTRIBUTE_UNUSED,
+		      asection *input_section ATTRIBUTE_UNUSED,
+		      bfd *output_bfd ATTRIBUTE_UNUSED,
+		      struct internal_reloc *rel ATTRIBUTE_UNUSED,
+		      struct internal_syment *sym ATTRIBUTE_UNUSED,
+		      struct reloc_howto_struct *howto,
+		      bfd_vma val,
+		      bfd_vma addend,
+		      bfd_vma *relocation,
+		      bfd_byte *contents ATTRIBUTE_UNUSED)
+{
+  struct xcoff_link_hash_entry *h;
+
+  if (0 > rel->r_symndx)
+    return FALSE;
+
+  h = obj_xcoff_sym_hashes (input_bfd)[rel->r_symndx];
+
+  /* FIXME: R_TLSML is targeting a internal TOC symbol, which will
+     make the following checks failing. It should be moved with
+     R_TLSM bellow once it works.  */
+  if (howto->type == R_TLSML)
+    {
+      *relocation = 0;
+      return TRUE;
+    }
+
+  /* FIXME: h is sometimes null, if the TLS symbol is not exported.  */
+  if (!h)
+    {
+      _bfd_error_handler
+	(_("%pB: TLS relocation at (0x%" BFD_VMA_FMT "x) over "
+	   "internal symbols (C_HIDEXT) not yet possible\n"),
+	 input_bfd, rel->r_vaddr);
+      return FALSE;
+    }
+
+
+  /* TLS relocations must target a TLS symbol.  */
+  if (h->smclas != XMC_TL && h->smclas != XMC_UL)
+    {
+      _bfd_error_handler
+	(_("%pB: TLS relocation at (0x%" BFD_VMA_FMT "x) over "
+	   "non-TLS symbol %s (0x%x)\n"),
+	 input_bfd, rel->r_vaddr, h->root.root.string, h->smclas);
+      return FALSE;
+    }
+
+  /* Local TLS relocations must target a local symbol, ie
+     non-imported. */
+  if ((rel->r_type == R_TLS_LD || rel->r_type == R_TLS_LE)
+      && (((h->flags & XCOFF_DEF_REGULAR) == 0
+       && (h->flags & XCOFF_DEF_DYNAMIC) != 0)
+	  || (h->flags & XCOFF_IMPORT) != 0))
+    {
+      _bfd_error_handler
+	(_("%pB: TLS local relocation at (0x%" BFD_VMA_FMT "x) over "
+	   "imported symbol %s\n"),
+	 input_bfd, rel->r_vaddr, h->root.root.string);
+      return FALSE;
+    }
+
+  /* R_TLSM and R_TLSML are relocations used by the loader.
+     The value must be 0.
+     FIXME: move R_TLSML here.  */
+  if (howto->type == R_TLSM)
+    {
+      *relocation = 0;
+      return TRUE;
+    }
+
+  /* Other TLS relocations aims to put offsets from TLS pointers
+     starting at -0x7c00 (or -0x7800 in XCOFF64).  It becomes a
+     simple R_POS relocation as long as .tdata and .tbss addresses
+     start at the same value. This is done in aix ld scripts.
+     TODO: implement optimization when tls size is < 62K.  */
+  *relocation = val + addend;
+
+  return TRUE;
+}
+
 static bfd_boolean
 xcoff_complain_overflow_dont_func (bfd *input_bfd ATTRIBUTE_UNUSED,
 				   bfd_vma val ATTRIBUTE_UNUSED,
@@ -3335,13 +3502,6 @@ xcoff_complain_overflow_unsigned_func (bfd *input_bfd,
    quite figure out when this is useful.  These relocs are
    not defined by the PowerOpen ABI.
 
-   R_TLS
-   R_TLS_IE
-   R_TLS_LD
-   R_TLSLE
-
-   Not yet implemented.
-
    Supported r_type's
 
    R_POS:
@@ -3437,6 +3597,25 @@ xcoff_complain_overflow_unsigned_func (bfd *input_bfd,
    fixed address which may be modified to a relative branch.
    The PowerOpen ABI does not define this relocation type.
 
+   R_TLS:
+   Thread-local storage relocation using general-dynamic
+   model.
+
+   R_TLS_IE:
+   Thread-local storage relocation using initial-exec model.
+
+   R_TLS_LD:
+   Thread-local storage relocation using local-dynamic model.
+
+   R_TLS_LE:
+   Thread-local storage relocation using local-exec model.
+
+   R_TLS:
+   Tread-local storage relocation used by the loader.
+
+   R_TLSM:
+   Tread-local storage relocation used by the loader.
+
    R_TOCU:
    Upper TOC relative relocation. The value is the
    high-order 16 bit of a TOC relative relocation.
diff --git a/bfd/coff64-rs6000.c b/bfd/coff64-rs6000.c
index 55a6821..f8e6849 100644
--- a/bfd/coff64-rs6000.c
+++ b/bfd/coff64-rs6000.c
@@ -212,12 +212,12 @@ xcoff64_calculate_relocation[XCOFF_MAX_CALCULATE_RELOCATION] =
   xcoff_reloc_type_fail, /*           (0x1d) */
   xcoff_reloc_type_fail, /*           (0x1e) */
   xcoff_reloc_type_fail, /*           (0x1f) */
-  xcoff_reloc_type_fail, /* R_TLS     (0x20) */
-  xcoff_reloc_type_fail, /* R_TLS_IE  (0x21) */
-  xcoff_reloc_type_fail, /* R_TLS_LD  (0x22) */
-  xcoff_reloc_type_fail, /* R_TLS_LE  (0x23) */
-  xcoff_reloc_type_fail, /* R_TLSM    (0x24) */
-  xcoff_reloc_type_fail, /* R_TLSML   (0x25) */
+  xcoff_reloc_type_tls,  /* R_TLS     (0x20) */
+  xcoff_reloc_type_tls,  /* R_TLS_IE  (0x21) */
+  xcoff_reloc_type_tls,  /* R_TLS_LD  (0x22) */
+  xcoff_reloc_type_tls,  /* R_TLS_LE  (0x23) */
+  xcoff_reloc_type_tls,  /* R_TLSM    (0x24) */
+  xcoff_reloc_type_tls,  /* R_TLSML   (0x25) */
   xcoff_reloc_type_fail, /*           (0x26) */
   xcoff_reloc_type_fail, /*           (0x27) */
   xcoff_reloc_type_fail, /*           (0x28) */
@@ -1230,24 +1230,95 @@ reloc_howto_type xcoff64_howto_table[] =
 	 0xffff,		/* dst_mask */
 	 FALSE),		/* pcrel_offset */
 
-
   /* 0x20: General-dynamic TLS relocation.  */
-  EMPTY_HOWTO (R_TLS),
+  HOWTO (R_TLS,			/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x21: Initial-exec TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_IE),
+  HOWTO (R_TLS_IE,		/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_IE",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x22: Local-dynamic TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_LD),
+  HOWTO (R_TLS_LD,		/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_LD",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x23: Local-exec TLS relocation.  */
-  EMPTY_HOWTO (R_TLS_LE),
+  HOWTO (R_TLS_LE,		/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLS_LE",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x24: TLS relocation.  */
-  EMPTY_HOWTO(R_TLSM),
+  HOWTO (R_TLSM,		/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLSM",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   /* 0x25: TLS module relocation.  */
-  EMPTY_HOWTO(R_TLSML),
+  HOWTO (R_TLSML,		/* type */
+	 0,			/* rightshift */
+	 4,			/* size (0 = byte, 1 = short, 2 = long) */
+	 64,			/* bitsize */
+	 FALSE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 0,			/* special_function */
+	 "R_TLSM",		/* name */
+	 TRUE,			/* partial_inplace */
+	 MINUS_ONE,		/* src_mask */
+	 MINUS_ONE,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
 
   EMPTY_HOWTO(0x26),
   EMPTY_HOWTO(0x27),
@@ -1355,6 +1426,18 @@ xcoff64_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
       return &xcoff64_howto_table[0];
     case BFD_RELOC_NONE:
       return &xcoff64_howto_table[0xf];
+    case BFD_RELOC_PPC64_TLSGD:
+      return &xcoff64_howto_table[0x20];
+    case BFD_RELOC_PPC64_TLSIE:
+      return &xcoff64_howto_table[0x21];
+    case BFD_RELOC_PPC64_TLSLD:
+      return &xcoff64_howto_table[0x22];
+    case BFD_RELOC_PPC64_TLSLE:
+      return &xcoff64_howto_table[0x23];
+    case BFD_RELOC_PPC64_TLSM:
+      return &xcoff64_howto_table[0x24];
+    case BFD_RELOC_PPC64_TLSML:
+      return &xcoff64_howto_table[0x25];
     default:
       return NULL;
     }
diff --git a/bfd/coffcode.h b/bfd/coffcode.h
index b0ca266..bcd34d4 100644
--- a/bfd/coffcode.h
+++ b/bfd/coffcode.h
@@ -548,6 +548,14 @@ sec_to_styp_flags (const char *sec_name, flagword sec_flags)
     }
 #endif
 #ifdef RS6000COFF_C
+  else if (!strcmp (sec_name, _TDATA))
+    {
+      styp_flags = STYP_TDATA;
+    }
+  else if (!strcmp (sec_name, _TBSS))
+    {
+      styp_flags = STYP_TBSS;
+    }
   else if (!strcmp (sec_name, _PAD))
     {
       styp_flags = STYP_PAD;
@@ -787,6 +795,22 @@ styp_to_sec_flags (bfd *abfd,
   else if (styp_flags & STYP_PAD)
     sec_flags = 0;
 #ifdef RS6000COFF_C
+  else if (styp_flags & STYP_TDATA)
+    {
+      if (sec_flags & SEC_NEVER_LOAD)
+	sec_flags |= SEC_DATA | SEC_THREAD_LOCAL | SEC_COFF_SHARED_LIBRARY;
+      else
+	sec_flags |= SEC_DATA | SEC_THREAD_LOCAL | SEC_LOAD | SEC_ALLOC;
+    }
+  else if (styp_flags & STYP_TBSS)
+    {
+#ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
+      if (sec_flags & SEC_NEVER_LOAD)
+	sec_flags |= SEC_ALLOC | SEC_THREAD_LOCAL | SEC_COFF_SHARED_LIBRARY;
+      else
+#endif
+	sec_flags |= SEC_ALLOC | SEC_THREAD_LOCAL;
+    }
   else if (styp_flags & STYP_EXCEPT)
     sec_flags |= SEC_LOAD;
   else if (styp_flags & STYP_LOADER)
@@ -3168,10 +3192,15 @@ coff_compute_section_file_positions (bfd * abfd)
 
 	     0 .text	     000054cc  10000128	 10000128  00000128  2**5
 			     CONTENTS, ALLOC, LOAD, CODE
+
+	     Don't perform the above tweak if the previous one is .tdata,
+	     as it will increase the memory allocated for every threads
+	     created and not just improve performances with gdb.
 	  */
 
-	  if (!strcmp (current->name, _TEXT)
-	      || !strcmp (current->name, _DATA))
+	  if ((!strcmp (current->name, _TEXT)
+	       || !strcmp (current->name, _DATA))
+	      && (previous == NULL || strcmp(previous->name, _TDATA)))
 	    {
 	      bfd_vma align = 4096;
 	      bfd_vma sofar_off = sofar % align;
@@ -3381,6 +3410,10 @@ coff_write_object_contents (bfd * abfd)
   asection *text_sec = NULL;
   asection *data_sec = NULL;
   asection *bss_sec = NULL;
+#ifdef RS6000COFF_C
+  asection *tdata_sec = NULL;
+  asection *tbss_sec = NULL;
+#endif
   struct internal_filehdr internal_f;
   struct internal_aouthdr internal_a;
 #ifdef COFF_LONG_SECTION_NAMES
@@ -3603,6 +3636,13 @@ coff_write_object_contents (bfd * abfd)
 	data_sec = current;
       else if (!strcmp (current->name, _BSS))
 	bss_sec = current;
+#ifdef RS6000COFF_C
+      else if (!strcmp (current->name, _TDATA))
+	tdata_sec = current;
+      else if (!strcmp (current->name, _TBSS))
+	tbss_sec = current;
+#endif
+
 
 #ifdef COFF_ENCODE_ALIGNMENT
       COFF_ENCODE_ALIGNMENT(section, current->alignment_power);
@@ -4041,6 +4081,29 @@ coff_write_object_contents (bfd * abfd)
       else
 	internal_a.o_snbss = 0;
 
+      if (tdata_sec != NULL)
+	{
+	  internal_a.o_sntdata = tdata_sec->target_index;
+	  /* TODO: o_flags should be set to RS6K_AOUTHDR_TLS_LE
+	     if there is at least one R_TLS_LE relocations.  */
+	  internal_a.o_flags = 0;
+#ifdef XCOFF64
+	  internal_a.o_x64flags = 0;
+#endif
+	}
+      else
+	{
+	  internal_a.o_sntdata = 0;
+	  internal_a.o_flags = 0;
+#ifdef XCOFF64
+	  internal_a.o_x64flags = 0;
+#endif
+	}
+      if (tbss_sec != NULL)
+	  internal_a.o_sntbss = tbss_sec->target_index;
+      else
+	  internal_a.o_sntbss = 0;
+
       toc = xcoff_data (abfd)->toc;
       internal_a.o_toc = toc;
       internal_a.o_sntoc = xcoff_data (abfd)->sntoc;
diff --git a/bfd/coffswap.h b/bfd/coffswap.h
index b97b66c..63a0026 100644
--- a/bfd/coffswap.h
+++ b/bfd/coffswap.h
@@ -695,9 +695,16 @@ coff_swap_aouthdr_out (bfd * abfd, void * in, void * out)
   H_PUT_32 (abfd, aouthdr_in->o_maxstack, aouthdr_out->o_maxstack);
   H_PUT_32 (abfd, aouthdr_in->o_maxdata, aouthdr_out->o_maxdata);
 #endif
-  memset (aouthdr_out->o_resv2, 0, sizeof aouthdr_out->o_resv2);
+  /* TODO: set o_*psize dynamically */
+  H_PUT_8 (abfd, 0, aouthdr_out->o_textpsize);
+  H_PUT_8 (abfd, 0, aouthdr_out->o_datapsize);
+  H_PUT_8 (abfd, 0, aouthdr_out->o_stackpsize);
+  H_PUT_8 (abfd, aouthdr_in->o_flags, aouthdr_out->o_flags);
+  H_PUT_16 (abfd, aouthdr_in->o_sntdata, aouthdr_out->o_sntdata);
+  H_PUT_16 (abfd, aouthdr_in->o_sntbss, aouthdr_out->o_sntbss);
+  H_PUT_32 (abfd, 0, aouthdr_out->o_debugger);
 #ifdef XCOFF64
-  memset (aouthdr_out->o_debugger, 0, sizeof aouthdr_out->o_debugger);
+  H_PUT_16 (abfd, aouthdr_in->o_x64flags, aouthdr_out->o_x64flags);
   memset (aouthdr_out->o_resv3, 0, sizeof aouthdr_out->o_resv3);
 #endif
 #endif
diff --git a/bfd/libbfd.h b/bfd/libbfd.h
index 62b6bf8..9cb079e 100644
--- a/bfd/libbfd.h
+++ b/bfd/libbfd.h
@@ -1564,6 +1564,10 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@",
   "BFD_RELOC_PPC_TLS",
   "BFD_RELOC_PPC_TLSGD",
   "BFD_RELOC_PPC_TLSLD",
+  "BFD_RELOC_PPC_TLSLE",
+  "BFD_RELOC_PPC_TLSIE",
+  "BFD_RELOC_PPC_TLSM",
+  "BFD_RELOC_PPC_TLSML",
   "BFD_RELOC_PPC_DTPMOD",
   "BFD_RELOC_PPC_TPREL16",
   "BFD_RELOC_PPC_TPREL16_LO",
@@ -1591,6 +1595,12 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@",
   "BFD_RELOC_PPC_GOT_DTPREL16_LO",
   "BFD_RELOC_PPC_GOT_DTPREL16_HI",
   "BFD_RELOC_PPC_GOT_DTPREL16_HA",
+  "BFD_RELOC_PPC64_TLSGD",
+  "BFD_RELOC_PPC64_TLSLD",
+  "BFD_RELOC_PPC64_TLSLE",
+  "BFD_RELOC_PPC64_TLSIE",
+  "BFD_RELOC_PPC64_TLSM",
+  "BFD_RELOC_PPC64_TLSML",
   "BFD_RELOC_PPC64_TPREL16_DS",
   "BFD_RELOC_PPC64_TPREL16_LO_DS",
   "BFD_RELOC_PPC64_TPREL16_HIGH",
diff --git a/bfd/libxcoff.h b/bfd/libxcoff.h
index 229e47c..bffdee2 100644
--- a/bfd/libxcoff.h
+++ b/bfd/libxcoff.h
@@ -234,6 +234,7 @@ extern xcoff_reloc_function xcoff_reloc_type_rel;
 extern xcoff_reloc_function xcoff_reloc_type_toc;
 extern xcoff_reloc_function xcoff_reloc_type_ba;
 extern xcoff_reloc_function xcoff_reloc_type_crel;
+extern xcoff_reloc_function xcoff_reloc_type_tls;
 
 /* Structure to describe dwarf sections.
    Useful to convert from XCOFF section name to flag and vice-versa.
diff --git a/bfd/reloc.c b/bfd/reloc.c
index 6864521..6fae177 100644
--- a/bfd/reloc.c
+++ b/bfd/reloc.c
@@ -2944,6 +2944,14 @@ ENUMX
 ENUMX
   BFD_RELOC_PPC_TLSLD
 ENUMX
+  BFD_RELOC_PPC_TLSLE
+ENUMX
+  BFD_RELOC_PPC_TLSIE
+ENUMX
+  BFD_RELOC_PPC_TLSM
+ENUMX
+  BFD_RELOC_PPC_TLSML
+ENUMX
   BFD_RELOC_PPC_DTPMOD
 ENUMX
   BFD_RELOC_PPC_TPREL16
@@ -2998,6 +3006,18 @@ ENUMX
 ENUMX
   BFD_RELOC_PPC_GOT_DTPREL16_HA
 ENUMX
+  BFD_RELOC_PPC64_TLSGD
+ENUMX
+  BFD_RELOC_PPC64_TLSLD
+ENUMX
+  BFD_RELOC_PPC64_TLSLE
+ENUMX
+  BFD_RELOC_PPC64_TLSIE
+ENUMX
+  BFD_RELOC_PPC64_TLSM
+ENUMX
+  BFD_RELOC_PPC64_TLSML
+ENUMX
   BFD_RELOC_PPC64_TPREL16_DS
 ENUMX
   BFD_RELOC_PPC64_TPREL16_LO_DS
diff --git a/bfd/xcofflink.c b/bfd/xcofflink.c
index f0d6c8d..f0dd0e9 100644
--- a/bfd/xcofflink.c
+++ b/bfd/xcofflink.c
@@ -1814,6 +1814,12 @@ xcoff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
 	      csect = bfd_make_section_anyway_with_flags (abfd, ".td",
 							  SEC_ALLOC);
 	    }
+	  else if (aux.x_csect.x_smclas == XMC_UL)
+	    {
+	      /* This is a thread-local unitialized csect.  */
+	      csect = bfd_make_section_anyway_with_flags (abfd, ".tbss",
+							  SEC_ALLOC | SEC_THREAD_LOCAL);
+	    }
 	  else
 	    csect = bfd_make_section_anyway_with_flags (abfd, ".bss",
 							SEC_ALLOC);
@@ -2697,6 +2703,14 @@ xcoff_need_ldrel_p (struct bfd_link_info *info, struct internal_reloc *rel,
 	    return FALSE;
 	}
       return TRUE;
+
+    case R_TLS:
+    case R_TLS_LE:
+    case R_TLS_IE:
+    case R_TLS_LD:
+    case R_TLSM:
+    case R_TLSML:
+      return TRUE;
     }
 }
 
@@ -4060,6 +4074,10 @@ xcoff_create_ldrel (bfd *output_bfd, struct xcoff_final_link_info *flinfo,
 	ldrel.l_symndx = 1;
       else if (strcmp (secname, ".bss") == 0)
 	ldrel.l_symndx = 2;
+      else if (strcmp (secname, ".tdata") == 0)
+	ldrel.l_symndx = -1;
+      else if (strcmp (secname, ".tbss") == 0)
+	ldrel.l_symndx = -2;
       else
 	{
 	  _bfd_error_handler
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 3713209..01161d5 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,28 @@
 2021-03-12  Clément Chigot  <clement.chigot@atos.net>
 
+	* 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.
+
+2021-03-12  Clément Chigot  <clement.chigot@atos.net>
+
 	* config/tc-ppc.c (ppc_xcoff_suffix): New function.
 	(MAP, MAP32, MAP64): New macros for XCOFF.
 	(ppc_xcoff_fixup_addis): New function.
diff --git a/gas/config/tc-ppc.c b/gas/config/tc-ppc.c
index 5ae9020..0c78b93 100644
--- a/gas/config/tc-ppc.c
+++ b/gas/config/tc-ppc.c
@@ -992,21 +992,41 @@ static bfd_boolean msolaris = SOLARIS_P;
 
 /* The RS/6000 assembler uses the .csect pseudo-op to generate code
    using a bunch of different sections.  These assembler sections,
-   however, are all encompassed within the .text or .data sections of
-   the final output file.  We handle this by using different
-   subsegments within these main segments.  */
-
-/* Next subsegment to allocate within the .text segment.  */
-static subsegT ppc_text_subsegment = 2;
-
-/* Linked list of csects in the text section.  */
-static symbolS *ppc_text_csects;
-
-/* Next subsegment to allocate within the .data segment.  */
-static subsegT ppc_data_subsegment = 2;
+   however, are all encompassed within the .text, .data or .bss sections
+   of the final output file.  We handle this by using different
+   subsegments within these main segments.
+   .tdata and .tbss sections only have one type of csects for now,
+   but it's better to follow the same construction like the others.  */
+
+struct ppc_xcoff_section ppc_xcoff_text_section;
+struct ppc_xcoff_section ppc_xcoff_data_section;
+struct ppc_xcoff_section ppc_xcoff_bss_section;
+struct ppc_xcoff_section ppc_xcoff_tdata_section;
+struct ppc_xcoff_section ppc_xcoff_tbss_section;
+
+/* Return true if the ppc_xcoff_section structure is already
+   initialized.  */
+static bfd_boolean
+ppc_xcoff_section_is_initialized (struct ppc_xcoff_section *section)
+{
+  return section->segment != NULL;
+}
 
-/* Linked list of csects in the data section.  */
-static symbolS *ppc_data_csects;
+/* Initialize a ppc_xcoff_section.
+   Dummy symbols are used to ensure the position of .text over .data
+   and .tdata.  These symbols won't be output.  */
+static void
+ppc_init_xcoff_section (struct ppc_xcoff_section *s, segT seg,
+			bfd_boolean need_dummy)
+{
+  s->segment = seg;
+  s->next_subsegment = 2;
+  if (need_dummy)
+    {
+      s->csects = symbol_make ("dummy\001");
+      symbol_get_tc (s->csects)->within = s->csects;
+    }
+}
 
 /* The current csect.  */
 static symbolS *ppc_current_csect;
@@ -1858,13 +1878,12 @@ md_begin (void)
 #ifdef OBJ_XCOFF
   ppc_coff_debug_section = coff_section_from_bfd_index (stdoutput, N_DEBUG);
 
-  /* Create dummy symbols to serve as initial csects.  This forces the
-     text csects to precede the data csects.  These symbols will not
-     be output.  */
-  ppc_text_csects = symbol_make ("dummy\001");
-  symbol_get_tc (ppc_text_csects)->within = ppc_text_csects;
-  ppc_data_csects = symbol_make ("dummy\001");
-  symbol_get_tc (ppc_data_csects)->within = ppc_data_csects;
+  /* Create XCOFF sections with .text in first, as it's creating dummy symbols
+     to serve as initial csects.  This forces the text csects to precede the
+     data csects.  These symbols will not be output.  */
+  ppc_init_xcoff_section (&ppc_xcoff_text_section, text_section, TRUE);
+  ppc_init_xcoff_section (&ppc_xcoff_data_section, data_section, TRUE);
+  ppc_init_xcoff_section (&ppc_xcoff_bss_section, bss_section, FALSE);
 #endif
 }
 
@@ -2674,6 +2693,16 @@ ppc_xcoff_suffix (char **str_p)
   static const struct map_bfd mapping[] = {
     MAP ("l",			BFD_RELOC_PPC_TOC16_LO),
     MAP ("u",			BFD_RELOC_PPC_TOC16_HI),
+    MAP32 ("ie",		BFD_RELOC_PPC_TLSIE),
+    MAP32 ("ld",		BFD_RELOC_PPC_TLSLD),
+    MAP32 ("le",		BFD_RELOC_PPC_TLSLE),
+    MAP32 ("m", 		BFD_RELOC_PPC_TLSM),
+    MAP32 ("ml",		BFD_RELOC_PPC_TLSML),
+    MAP64 ("ie",		BFD_RELOC_PPC64_TLSIE),
+    MAP64 ("ld",		BFD_RELOC_PPC64_TLSLD),
+    MAP64 ("le",		BFD_RELOC_PPC64_TLSLE),
+    MAP64 ("m", 		BFD_RELOC_PPC64_TLSM),
+    MAP64 ("ml",		BFD_RELOC_PPC64_TLSML),
   };
 
   if (*str++ != '@')
@@ -2726,6 +2755,24 @@ ppc_xcoff_fixup_addis (char *rt_e, char *d_e, char *ra_e)
   free (save_ra);
 }
 
+/* Support @ie, etc. on constants emitted via .short, .int etc.  */
+
+bfd_reloc_code_real_type
+ppc_xcoff_parse_cons (expressionS *exp, unsigned int nbytes)
+{
+  expression (exp);
+  if (nbytes >= 2 && *input_line_pointer == '@')
+    return ppc_xcoff_suffix (&input_line_pointer);
+
+  /* There isn't any @ symbol for default TLS relocations (R_TLS).  */
+  if (exp->X_add_symbol != NULL
+      && (symbol_get_tc (exp->X_add_symbol)->symbol_class == XMC_TL
+	  || symbol_get_tc (exp->X_add_symbol)->symbol_class == XMC_UL))
+      return (ppc_obj64 ? BFD_RELOC_PPC64_TLSGD: BFD_RELOC_PPC_TLSGD);
+
+  return BFD_RELOC_NONE;
+}
+
 #endif /* OBJ_XCOFF */
 
 #if defined (OBJ_XCOFF) || defined (OBJ_ELF)
@@ -3052,6 +3099,10 @@ fixup_size (bfd_reloc_code_real_type reloc, bfd_boolean *pc_relative)
     case BFD_RELOC_PPC_TLS:
     case BFD_RELOC_PPC_TLSGD:
     case BFD_RELOC_PPC_TLSLD:
+    case BFD_RELOC_PPC_TLSLE:
+    case BFD_RELOC_PPC_TLSIE:
+    case BFD_RELOC_PPC_TLSM:
+    case BFD_RELOC_PPC_TLSML:
     case BFD_RELOC_PPC_VLE_HA16A:
     case BFD_RELOC_PPC_VLE_HA16D:
     case BFD_RELOC_PPC_VLE_HI16A:
@@ -3111,6 +3162,12 @@ fixup_size (bfd_reloc_code_real_type reloc, bfd_boolean *pc_relative)
     case BFD_RELOC_PPC64_TPREL34:
     case BFD_RELOC_PPC64_DTPREL34:
     case BFD_RELOC_PPC64_TOC:
+    case BFD_RELOC_PPC64_TLSGD:
+    case BFD_RELOC_PPC64_TLSLD:
+    case BFD_RELOC_PPC64_TLSLE:
+    case BFD_RELOC_PPC64_TLSIE:
+    case BFD_RELOC_PPC64_TLSM:
+    case BFD_RELOC_PPC64_TLSML:
       size = 8;
       break;
 
@@ -4205,7 +4262,9 @@ static bfd_boolean ppc_stab_symbol;
 /* The .comm and .lcomm pseudo-ops for XCOFF.  XCOFF puts common
    symbols in the .bss segment as though they were local common
    symbols, and uses a different smclas.  The native Aix 4.3.3 assembler
-   aligns .comm and .lcomm to 4 bytes.  */
+   aligns .comm and .lcomm to 4 bytes.
+   Symbols having a XMC_UL storage class are uninialized thread-local
+   data.  */
 
 static void
 ppc_comm (int lcomm)
@@ -4220,6 +4279,7 @@ ppc_comm (int lcomm)
   symbolS *lcomm_sym = NULL;
   symbolS *sym;
   char *pfrag;
+  struct ppc_xcoff_section *section;
 
   endc = get_symbol_name (&name);
   end_name = input_line_pointer;
@@ -4312,7 +4372,23 @@ ppc_comm (int lcomm)
       return;
     }
 
-  record_alignment (bss_section, align);
+  if (symbol_get_tc (sym)->symbol_class == XMC_UL
+      || (lcomm && symbol_get_tc (lcomm_sym)->symbol_class == XMC_UL))
+    {
+      section = &ppc_xcoff_tbss_section;
+      if (!ppc_xcoff_section_is_initialized (section))
+	{
+	  ppc_init_xcoff_section (section,
+				  subseg_new (".tbss", 0), FALSE);
+	  bfd_set_section_flags (section->segment,
+				 SEC_ALLOC | SEC_THREAD_LOCAL);
+	  seg_info (section->segment)->bss = 1;
+	}
+    }
+  else
+    section = &ppc_xcoff_bss_section;
+
+  record_alignment (section->segment, align);
 
   if (! lcomm
       || ! S_IS_DEFINED (lcomm_sym))
@@ -4333,14 +4409,14 @@ ppc_comm (int lcomm)
 	  def_size = 0;
 	}
 
-      subseg_set (bss_section, 1);
+      subseg_set (section->segment, 1);
       frag_align (align, 0, 0);
 
       symbol_set_frag (def_sym, frag_now);
       pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, def_sym,
 			def_size, (char *) NULL);
       *pfrag = 0;
-      S_SET_SEGMENT (def_sym, bss_section);
+      S_SET_SEGMENT (def_sym, section->segment);
       symbol_get_tc (def_sym)->align = align;
     }
   else if (lcomm)
@@ -4356,7 +4432,7 @@ ppc_comm (int lcomm)
   if (lcomm)
     {
       /* Make sym an offset from lcomm_sym.  */
-      S_SET_SEGMENT (sym, bss_section);
+      S_SET_SEGMENT (sym, section->segment);
       symbol_set_frag (sym, symbol_get_frag (lcomm_sym));
       S_SET_VALUE (sym, symbol_get_frag (lcomm_sym)->fr_offset);
       symbol_get_frag (lcomm_sym)->fr_offset += size;
@@ -4414,7 +4490,7 @@ ppc_change_csect (symbolS *sym, offsetT align)
     subseg_set (S_GET_SEGMENT (sym), symbol_get_tc (sym)->subseg);
   else
     {
-      symbolS **list_ptr;
+      struct ppc_xcoff_section *section;
       int after_toc;
       int hold_chunksize;
       symbolS *list;
@@ -4436,10 +4512,7 @@ ppc_change_csect (symbolS *sym, offsetT align)
 	case XMC_SV:
 	case XMC_TI:
 	case XMC_TB:
-	  S_SET_SEGMENT (sym, text_section);
-	  symbol_get_tc (sym)->subseg = ppc_text_subsegment;
-	  ++ppc_text_subsegment;
-	  list_ptr = &ppc_text_csects;
+	  section = &ppc_xcoff_text_section;
 	  is_code = 1;
 	  break;
 	case XMC_RW:
@@ -4448,21 +4521,48 @@ ppc_change_csect (symbolS *sym, offsetT align)
 	case XMC_TE:
 	case XMC_DS:
 	case XMC_UA:
-	case XMC_BS:
 	case XMC_UC:
+	  section = &ppc_xcoff_data_section;
 	  if (ppc_toc_csect != NULL
 	      && (symbol_get_tc (ppc_toc_csect)->subseg + 1
-		  == ppc_data_subsegment))
+		  == section->next_subsegment))
 	    after_toc = 1;
-	  S_SET_SEGMENT (sym, data_section);
-	  symbol_get_tc (sym)->subseg = ppc_data_subsegment;
-	  ++ppc_data_subsegment;
-	  list_ptr = &ppc_data_csects;
+	  break;
+	case XMC_BS:
+	  section = &ppc_xcoff_bss_section;
+	  break;
+	case XMC_TL:
+	  section = &ppc_xcoff_tdata_section;
+	  /* Create .tdata section if not yet done.  */
+	  if (!ppc_xcoff_section_is_initialized (section))
+	    {
+	      ppc_init_xcoff_section (section, subseg_new (".tdata", 0),
+					TRUE);
+	      bfd_set_section_flags (section->segment, SEC_ALLOC
+				     | SEC_LOAD | SEC_RELOC | SEC_DATA
+				     | SEC_THREAD_LOCAL);
+	    }
+	  break;
+	case XMC_UL:
+	  section = &ppc_xcoff_tbss_section;
+	  /* Create .tbss section if not yet done.  */
+	  if (!ppc_xcoff_section_is_initialized (section))
+	    {
+	      ppc_init_xcoff_section (section, subseg_new (".tbss", 0),
+				      FALSE);
+	      bfd_set_section_flags (section->segment, SEC_ALLOC |
+				     SEC_THREAD_LOCAL);
+	      seg_info (section->segment)->bss = 1;
+	    }
 	  break;
 	default:
 	  abort ();
 	}
 
+      S_SET_SEGMENT (sym, section->segment);
+      symbol_get_tc (sym)->subseg = section->next_subsegment;
+      ++section->next_subsegment;
+
       /* We set the obstack chunk size to a small value before
 	 changing subsegments, so that we don't use a lot of memory
 	 space for what may be a small section.  */
@@ -4490,7 +4590,7 @@ ppc_change_csect (symbolS *sym, offsetT align)
       symbol_get_tc (sym)->output = 1;
       symbol_get_tc (sym)->within = sym;
 
-      for (list = *list_ptr;
+      for (list = section->csects;
 	   symbol_get_tc (list)->next != (symbolS *) NULL;
 	   list = symbol_get_tc (list)->next)
 	;
@@ -5329,8 +5429,8 @@ ppc_toc (int ignore ATTRIBUTE_UNUSED)
       symbolS *sym;
       symbolS *list;
 
-      subseg = ppc_data_subsegment;
-      ++ppc_data_subsegment;
+      subseg = ppc_xcoff_data_section.next_subsegment;
+      ++ppc_xcoff_data_section.next_subsegment;
 
       subseg_new (segment_name (data_section), subseg);
       ppc_toc_frag = frag_now;
@@ -5345,7 +5445,7 @@ ppc_toc (int ignore ATTRIBUTE_UNUSED)
 
       ppc_toc_csect = sym;
 
-      for (list = ppc_data_csects;
+      for (list = ppc_xcoff_data_section.csects;
 	   symbol_get_tc (list)->next != (symbolS *) NULL;
 	   list = symbol_get_tc (list)->next)
 	;
@@ -5711,12 +5811,16 @@ ppc_symbol_new_hook (symbolS *sym)
 	tc->symbol_class = XMC_TC0;
       else if (strcmp (s, "TE]") == 0)
 	tc->symbol_class = XMC_TE;
+      else if (strcmp (s, "TL]") == 0)
+	tc->symbol_class = XMC_TL;
       break;
     case 'U':
       if (strcmp (s, "UA]") == 0)
 	tc->symbol_class = XMC_UA;
       else if (strcmp (s, "UC]") == 0)
 	tc->symbol_class = XMC_UC;
+      else if (strcmp (s, "UL]") == 0)
+	tc->symbol_class = XMC_UL;
       break;
     case 'X':
       if (strcmp (s, "XO]") == 0)
@@ -5858,12 +5962,15 @@ ppc_frob_symbol (symbolS *sym)
 	    }
 	  a->x_csect.x_smtyp = (symbol_get_tc (sym)->align << 3) | XTY_SD;
 	}
-      else if (S_GET_SEGMENT (sym) == bss_section)
+      else if (S_GET_SEGMENT (sym) == bss_section
+	       || S_GET_SEGMENT (sym) == ppc_xcoff_tbss_section.segment)
 	{
 	  /* This is a common symbol.  */
 	  a->x_csect.x_scnlen.l = symbol_get_frag (sym)->fr_offset;
 	  a->x_csect.x_smtyp = (symbol_get_tc (sym)->align << 3) | XTY_CM;
-	  if (S_IS_EXTERNAL (sym))
+	  if (S_GET_SEGMENT (sym) == ppc_xcoff_tbss_section.segment)
+	    symbol_get_tc (sym)->symbol_class = XMC_UL;
+	  else if (S_IS_EXTERNAL (sym))
 	    symbol_get_tc (sym)->symbol_class = XMC_RW;
 	  else
 	    symbol_get_tc (sym)->symbol_class = XMC_BS;
@@ -5917,9 +6024,11 @@ ppc_frob_symbol (symbolS *sym)
 	  /* This is a normal symbol definition.  x_scnlen is the
 	     symbol index of the containing csect.  */
 	  if (S_GET_SEGMENT (sym) == text_section)
-	    csect = ppc_text_csects;
+	    csect = ppc_xcoff_text_section.csects;
 	  else if (S_GET_SEGMENT (sym) == data_section)
-	    csect = ppc_data_csects;
+	    csect = ppc_xcoff_data_section.csects;
+	  else if (S_GET_SEGMENT (sym) == ppc_xcoff_tdata_section.segment)
+	    csect = ppc_xcoff_tdata_section.csects;
 	  else
 	    abort ();
 
@@ -6201,6 +6310,7 @@ ppc_fix_adjustable (fixS *fix)
       && tc->symbol_class != XMC_TC
       && tc->symbol_class != XMC_TE
       && symseg != bss_section
+      && symseg != ppc_xcoff_tbss_section.segment
       /* Don't adjust if this is a reloc in the toc section.  */
       && (symseg != data_section
 	  || ppc_toc_csect == NULL
@@ -7134,6 +7244,37 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg)
 #endif
 
 #ifdef OBJ_XCOFF
+	case BFD_RELOC_PPC_TLSGD:
+	case BFD_RELOC_PPC_TLSLD:
+	case BFD_RELOC_PPC_TLSLE:
+	case BFD_RELOC_PPC_TLSIE:
+	case BFD_RELOC_PPC_TLSM:
+	case BFD_RELOC_PPC64_TLSGD:
+	case BFD_RELOC_PPC64_TLSLD:
+	case BFD_RELOC_PPC64_TLSLE:
+	case BFD_RELOC_PPC64_TLSIE:
+	case BFD_RELOC_PPC64_TLSM:
+	  gas_assert (fixP->fx_addsy != NULL);
+	  S_SET_THREAD_LOCAL (fixP->fx_addsy);
+	  fieldval = 0;
+	  break;
+
+	  /* TLSML relocations are targeting a XMC_TC symbol named
+	     "_$TLSML". We can't check earlier because the relocation
+	     can target any symbol name which will be latter .rename
+	     to "_$TLSML".  */
+	case BFD_RELOC_PPC_TLSML:
+	case BFD_RELOC_PPC64_TLSML:
+	  gas_assert (fixP->fx_addsy != NULL);
+	  if (strcmp (symbol_get_tc (fixP->fx_addsy)->real_name, "_$TLSML") != 0)
+	    {
+	      as_bad_where (fixP->fx_file, fixP->fx_line,
+			    _("R_TLSML relocation doesn't target a "
+			      "symbol named \"_$TLSML\". %s"), S_GET_NAME(fixP->fx_addsy));
+	    }
+	  fieldval = 0;
+	  break;
+
 	case BFD_RELOC_NONE:
 #endif
 	case BFD_RELOC_CTOR:
diff --git a/gas/config/tc-ppc.h b/gas/config/tc-ppc.h
index 9e2f174..d38c7d4 100644
--- a/gas/config/tc-ppc.h
+++ b/gas/config/tc-ppc.h
@@ -189,6 +189,23 @@ do {								\
 extern void ppc_xcoff_end (void);
 #define md_end ppc_xcoff_end
 
+#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES)	\
+  ppc_xcoff_parse_cons (EXP, NBYTES)
+extern bfd_reloc_code_real_type ppc_xcoff_parse_cons (expressionS *,
+						    unsigned int);
+/* XCOFF format allows only few predefined sections. Gather all
+   information in a common structure.  */
+struct ppc_xcoff_section {
+  /* Main segment of the section.  */
+  segT segment;
+
+  /* Next subsegment to allocate within the segment.  */
+  subsegT next_subsegment;
+
+  /* Linked list of csects in the section.  */
+  symbolS *csects;
+};
+
 #endif /* OBJ_XCOFF */
 
 #define tc_new_dot_label(sym) ppc_new_dot_label (sym)
diff --git a/include/ChangeLog b/include/ChangeLog
index c736323..3a40b16 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,5 +1,17 @@
 2021-03-12  Clément Chigot  <clement.chigot@atos.net>
 
+	* 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.
+
+2021-03-12  Clément Chigot  <clement.chigot@atos.net>
+
 	* coff/xcoff.h (R_RTB): Remove.
 	(R_TRL): Fix value.
 
diff --git a/include/coff/internal.h b/include/coff/internal.h
index 1655181..1b5b45c 100644
--- a/include/coff/internal.h
+++ b/include/coff/internal.h
@@ -263,8 +263,13 @@ struct internal_aouthdr
   short o_algndata;		/* max alignment for data	*/
   short o_modtype;		/* Module type field, 1R,RE,RO	*/
   short o_cputype;		/* Encoded CPU type		*/
-  bfd_vma o_maxstack;	/* max stack size allowed.	*/
-  bfd_vma o_maxdata;	/* max data size allowed.	*/
+  bfd_vma o_maxstack;		/* max stack size allowed.	*/
+  bfd_vma o_maxdata;		/* max data size allowed.	*/
+  char o_flags;			/* Flags and TLS alignment	*/
+  short o_sntdata;		/* section number for tdata	*/
+  short o_sntbss;		/* section number for tbss	*/
+  short o_x64flags;		/* XCOFF64 flags		*/
+
 
   /* ECOFF stuff */
   bfd_vma bss_start;		/* Base of bss section.		*/
diff --git a/include/coff/rs6000.h b/include/coff/rs6000.h
index 280a81f..ff2de53 100644
--- a/include/coff/rs6000.h
+++ b/include/coff/rs6000.h
@@ -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;
 
diff --git a/include/coff/rs6k64.h b/include/coff/rs6k64.h
index 1faf8e5..53adf4b 100644
--- a/include/coff/rs6k64.h
+++ b/include/coff/rs6k64.h
@@ -39,32 +39,38 @@ struct external_filehdr
 
 /********************** AOUT "OPTIONAL HEADER" **********************/
 
-typedef struct 
+typedef struct
 {
-  unsigned char	magic[2];		/* type of file			*/
-  unsigned char	vstamp[2];		/* version stamp		*/
-  unsigned char	o_debugger[4];		/* reserved 			*/
-  unsigned char	text_start[8];		/* base of text used for this file */
-  unsigned char	data_start[8];		/* base of data used for this file */
-  unsigned char	o_toc[8];		/* 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 magic[2];		/* type of file			*/
+  unsigned char vstamp[2];		/* version stamp		*/
+  unsigned char o_debugger[4];		/* reserved			*/
+  unsigned char text_start[8];		/* base of text used for this file */
+  unsigned char data_start[8];		/* base of data used for this file */
+  unsigned char o_toc[8];		/* 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_resv2[4];		/* reserved 			*/
-  unsigned char	tsize[8];		/* text size bytes, padded to FW bdry */
-  unsigned char	dsize[8];		/* initialized data "  "	*/
-  unsigned char	bsize[8];		/* uninitialized data "   "	*/
-  unsigned char	entry[8];		/* entry pt.			*/
-  unsigned char	o_maxstack[8];		/* max stack size (??) 		*/
-  unsigned char o_maxdata[8];		/* max data size (??) 		*/
-  unsigned char	o_resv3[16];		/* 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 tsize[8];		/* text size bytes, padded to FW bdry */
+  unsigned char dsize[8];		/* initialized data "  "	*/
+  unsigned char bsize[8];		/* uninitialized data "	  "	*/
+  unsigned char entry[8];		/* entry pt.			*/
+  unsigned char o_maxstack[8];		/* max stack size (??)		*/
+  unsigned char o_maxdata[8];		/* max data size (??)		*/
+  unsigned char o_sntdata[2];		/* section number of .tdata section */
+  unsigned char o_sntbss[2];		/* section number of .tbss section */
+  unsigned char o_x64flags[2];		/* XCOFF64 flags */
+  unsigned char o_resv3[10];		/* reserved			*/
 }
 AOUTHDR;
 
diff --git a/include/coff/xcoff.h b/include/coff/xcoff.h
index 36651d4..05e9160 100644
--- a/include/coff/xcoff.h
+++ b/include/coff/xcoff.h
@@ -46,6 +46,8 @@
 #define _TEXT	".text"
 #define _DATA	".data"
 #define _BSS	".bss"
+#define _TDATA	".tdata"
+#define _TBSS	".tbss"
 #define _PAD	".pad"
 #define _LOADER	".loader"
 #define _EXCEPT ".except"
@@ -93,8 +95,19 @@
 #define	RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
 #define	RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
 
-/* XCOFF relocation types.  
-   The relocations are described in the function  
+/* Flags for aouthdr o_flags */
+#define RS6K_AOUTHDR_TLS_LE    0x80  /* TLS local-exec code was generated */
+#define RS6K_AOUTHDR_RAS       0x40  /* kernel module is key & recovery safe */
+#define RS6K_AOUTHDR_ALGNTDATA 0xf   /* TLS alignment */
+
+/* Flags for aouthdr o_x64flags */
+#define RS6K_AOUTHDR_SHR_SYMTAB  0x8000
+#define RS6K_AOUTHDR_FORK_POLICY 0x4000
+#define RS6K_AOUTHDR_FORK_COR    0x2000
+
+
+/* XCOFF relocation types.
+   The relocations are described in the function
    xcoff[64]_ppc_relocate_section in coff64-rs6000.c and coff-rs6000.c  */
 
 #define R_POS    (0x00)
@@ -171,7 +184,7 @@
 #define	XMC_SV3264 18		/* Read-only 32 or 64 bit supervisor call */
 /*                19   ??? */
 #define XMC_TL     20          /* Read-write initialized TLS data */
-#define XMC_TU     21          /* Read-write uninitialized TLS data */
+#define XMC_UL     21          /* Read-write uninitialized TLS data */
 #define XMC_TE     22          /* Same as XMC_TC but mapped after it */
 
 /* The ldhdr structure.  This appears at the start of the .loader
diff --git a/ld/ChangeLog b/ld/ChangeLog
index 024ea0d..35c5e20 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,5 +1,20 @@
 2021-03-12  Clément Chigot  <clement.chigot@atos.net>
 
+	* 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.
+
+2021-03-12  Clément Chigot  <clement.chigot@atos.net>
+
 	* scripttempl/aix.sc: Add .te to .data section.
 	* testsuite/ld-powerpc/aix52.exp: Add test structure for AIX7+.
 	Add aix-largetoc-1 test.
diff --git a/ld/emultempl/aix.em b/ld/emultempl/aix.em
index d578b6e..e098f2a 100644
--- a/ld/emultempl/aix.em
+++ b/ld/emultempl/aix.em
@@ -969,6 +969,44 @@ gld${EMULATION_NAME}_before_allocation (void)
 	  sec->flags |= SEC_KEEP;
       }
 
+  /* Make sure .tdata is removed if empty, even with -r flag.
+     .tdata is always being generated because its size is needed
+     to cumpute .data address.  */
+  if (bfd_link_relocatable (&link_info))
+    {
+      static const char *const thread_sections[] = {
+	".tdata",
+	".tbss"
+      };
+
+      /* Run lang_size_sections (if not already done).  */
+      if (expld.phase != lang_mark_phase_enum)
+	{
+	  expld.phase = lang_mark_phase_enum;
+	  expld.dataseg.phase = exp_seg_none;
+	  one_lang_size_sections_pass (NULL, FALSE);
+	  lang_reset_memory_regions ();
+	}
+
+      for (i = 0; i < ARRAY_SIZE (thread_sections); i++)
+	{
+	  asection *sec;
+
+	  sec = bfd_get_section_by_name (link_info.output_bfd,
+					 thread_sections[i]);
+
+	  if (sec != NULL && sec->rawsize == 0
+	      && (sec->flags & SEC_KEEP) == 0
+	      && !bfd_section_removed_from_list (link_info.output_bfd,
+						 sec))
+	    {
+	      sec->flags |= SEC_EXCLUDE;
+	      bfd_section_list_remove (link_info.output_bfd, sec);
+	      link_info.output_bfd->section_count--;
+	    }
+	}
+    }
+
   before_allocation_default ();
 }
 
diff --git a/ld/scripttempl/aix.sc b/ld/scripttempl/aix.sc
index aa129d9..3e4d7c0 100644
--- a/ld/scripttempl/aix.sc
+++ b/ld/scripttempl/aix.sc
@@ -37,7 +37,35 @@ SECTIONS
     ${RELOCATING+PROVIDE (_etext = .);}
   }
 
-  . = ALIGN (ALIGN (0x10000000) + (. & 0xfff), 32);
+  /* .tdata and .tbss addresses are representing the offset from
+     the TLS pointer. It starts at -0x7800 for 64bit and -0x7c00
+     for 32bit.
+     TODO: 32bit should have -0x7c00 but it works like this for
+     now.
+     The other particularity is that they must be before .data
+     sections. But .data must be aligned correctly as if the
+     addresses were contiguous. This means that the correct
+     address must be restored, taking into account: the size of
+     .text, its alignment 2^5, the size of .tdata and its
+     aligment 2^4.  */
+  .tdata -0x7800 : {
+    *(.tdata)
+    *(.tl)
+  }
+
+  .tbss : {
+    *(.tbss)
+    *(.ul)
+  }
+
+  . = ${RELOCATING+(ALIGN (0x10000000 + SIZEOF_HEADERS, 32)) + }SIZEOF(.text);
+  . = ALIGN (.,32);
+  . = . + SIZEOF(.tdata);
+  . = ALIGN (.,16);
+
+  /* .data starting address must be in a different segment than
+     the .text addresses. Thus, 0x10000000 is added.  */
+  . = ALIGN (0x10000000) + (. & 0xfff);
   .data . : {
     ${RELOCATING+PROVIDE (_data = .);}
     *(.data)
diff --git a/ld/testsuite/ld-powerpc/aix-tls-reloc-32.d b/ld/testsuite/ld-powerpc/aix-tls-reloc-32.d
new file mode 100644
index 0000000..5103de5
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-reloc-32.d
@@ -0,0 +1,35 @@
+#source: aix-tls-reloc.s
+#as: -a32
+#ld: -b32 -shared -bE:aix-tls-reloc.ex
+#objdump: -dr
+#target: [is_xcoff_format]
+
+.*
+
+Disassembly of section \.text:
+
+.* <\.foo>:
+.*:	80 82 00 00 	l       r4,0\(r2\)
+.*: R_TOC	gd-.*
+.*:	80 62 00 04 	l       r3,4\(r2\)
+.*: R_TOC	.gd-.*
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__tls_get_addr
+.*:	80 62 00 0c 	l       r3,12\(r2\)
+.*: R_TOC	_\$TLSML-.*
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__tls_get_mod
+.*:	80 82 00 08 	l       r4,8\(r2\)
+.*: R_TOC	ld-.*
+.*:	7c a3 22 14 	cax     r5,r3,r4
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__get_tpointer
+.*:	80 82 00 10 	l       r4,16\(r2\)
+.*: R_TOC	ie-.*
+.*:	7c a3 22 14 	cax     r5,r3,r4
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__get_tpointer
+.*:	80 82 00 14 	l       r4,20\(r2\)
+.*: R_TOC	le-.*
+.*:	7c a3 22 14 	cax     r5,r3,r4
+.*
diff --git a/ld/testsuite/ld-powerpc/aix-tls-reloc-64.d b/ld/testsuite/ld-powerpc/aix-tls-reloc-64.d
new file mode 100644
index 0000000..71f6302
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-reloc-64.d
@@ -0,0 +1,31 @@
+#source: aix-tls-reloc.s
+#as: -a32
+#ld: -b32 -shared -bE:aix-tls-reloc.ex
+#objdump: -dr
+#target: [is_xcoff_format]
+
+.*
+
+Disassembly of section \.text:
+
+.* <\.foo>:
+.*:	e8 82 00 00 	ld      r4,0\(r2\)
+.*: R_TOC	gd-.*
+.*:	e8 62 00 08 	ld      r3,8\(r2\)
+.*: R_TOC	.gd-.*
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__tls_get_addr
+.*:	e8 62 00 18 	ld      r3,24\(r2\)
+.*: R_TOC	_\$TLSML-.*
+.*:	48 00 00 03 	bla     0 <\.foo-.*>
+.*: R_BA_26	__tls_get_mod
+.*:	80 82 00 10 	lwz     r4,16\(r2\)
+.*: R_TOC	ld-.*
+.*:	7c a3 22 14 	add     r5,r3,r4
+.*:	e8 82 00 20 	ld      r4,32\(r2\)
+.*: R_TOC	ie-.*
+.*:	7c a4 6a 14 	add     r5,r4,r13
+.*:	e8 82 00 28 	ld      r4,40\(r2\)
+.*: R_TOC	le-.*
+.*:	7c a3 6a 14 	add     r5,r3,r13
+.*
diff --git a/ld/testsuite/ld-powerpc/aix-tls-reloc.ex b/ld/testsuite/ld-powerpc/aix-tls-reloc.ex
new file mode 100644
index 0000000..257cc56
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-reloc.ex
@@ -0,0 +1 @@
+foo
diff --git a/ld/testsuite/ld-powerpc/aix-tls-reloc.s b/ld/testsuite/ld-powerpc/aix-tls-reloc.s
new file mode 100644
index 0000000..62ef73c
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-reloc.s
@@ -0,0 +1,65 @@
+  .globl bar[TL]
+  .csect bar[TL]
+  .long 1
+
+  .toc
+  .tc gd[TC],bar[TL]
+  .tc .gd[TC],bar[TL]@m
+  .tc ld[TC],bar[TL]@ld
+  .tc mh[TC],mh[TC]@ml
+  .tc ie[TC],bar[TL]@ie
+  .tc le[TC],bar[TL]@le
+
+  .globl foo
+  .globl .foo
+  .csect foo[DS],3
+foo:
+  .if size == 32
+  .long	.foo, TOC[tc0], 0
+  .else
+  .llong .foo, TOC[tc0], 0
+  .endif
+
+  .csect foo[PR]
+.foo:
+  #GD
+  .if size == 32
+  lwz 4, gd[TC](2)
+  lwz 3, .gd[TC](2)
+  .else
+  ld 4, gd[TC](2)
+  ld 3, .gd[TC](2)
+  .endif
+  bla __tls_get_addr
+
+  #LD
+  .if size == 32
+  lwz 3, mh[TC](2)
+  .else
+  ld 3, mh[TC](2)
+  .endif
+  bla __tls_get_mod
+  lwz 4, ld[TC](2)
+  add 5,3,4
+
+  #IE
+  .if size == 32
+  bla __get_tpointer
+  lwz 4, ie[TC](2)
+  add 5,3,4
+  .else
+  ld 4, ie[TC](2)
+  add 5,4,13
+  .endif
+
+  #LE
+  .if size == 32
+  bla __get_tpointer
+  lwz 4, le[TC](2)
+  add 5,3,4
+  .else
+  ld 4, le[TC](2)
+  add 5,3,13
+  .endif
+
+.rename mh[TC], "_$TLSML" # Symbol for the module handle
diff --git a/ld/testsuite/ld-powerpc/aix-tls-section-32.d b/ld/testsuite/ld-powerpc/aix-tls-section-32.d
new file mode 100644
index 0000000..16b9686
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-section-32.d
@@ -0,0 +1,15 @@
+#source: aix-tls-section.s
+#as: -a32
+#ld: -b32 -shared -bE:aix-tls-section.ex
+#objdump: -hw
+#target: [is_xcoff_format]
+
+.*
+
+Sections:
+.*
+  0 \.text         .*  .*  .*  .*  .*  ALLOC, LOAD, CODE
+  1 \.tdata        00000008  ffff8800  ffff8800  .*  .*  CONTENTS, ALLOC, LOAD, DATA, THREAD_LOCAL
+  2 \.tbss         00000008  ffff8808  ffff8808  .*  .*  ALLOC, THREAD_LOCAL
+  3 \.data         .*  .*  .*  .*  .*  ALLOC, LOAD, DATA
+#...
diff --git a/ld/testsuite/ld-powerpc/aix-tls-section-64.d b/ld/testsuite/ld-powerpc/aix-tls-section-64.d
new file mode 100644
index 0000000..dceeaaf
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-section-64.d
@@ -0,0 +1,15 @@
+#source: aix-tls-section.s
+#as: -a64
+#ld: -b64 -shared -bE:aix-tls-section.ex
+#objdump: -hw
+#target: [is_xcoff_format]
+
+.*
+
+Sections\:
+.*
+  0 \.text         .*  .*  .*  .*  .*  ALLOC, LOAD, CODE
+  1 \.tdata        00000008  ffffffffffff8800  ffffffffffff8800  .*  .*  CONTENTS, ALLOC, LOAD, DATA, THREAD_LOCAL
+  2 \.tbss         00000008  ffffffffffff8808  ffffffffffff8808  .*  .*  ALLOC, THREAD_LOCAL
+  3 \.data         .* .* .*  .*  .*  ALLOC, LOAD, DATA
+#...
diff --git a/ld/testsuite/ld-powerpc/aix-tls-section.ex b/ld/testsuite/ld-powerpc/aix-tls-section.ex
new file mode 100644
index 0000000..3bd1f0e
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-section.ex
@@ -0,0 +1,2 @@
+foo
+bar
diff --git a/ld/testsuite/ld-powerpc/aix-tls-section.s b/ld/testsuite/ld-powerpc/aix-tls-section.s
new file mode 100644
index 0000000..30c328f
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/aix-tls-section.s
@@ -0,0 +1,8 @@
+  /* .tbss */
+  .comm foo[UL],8
+  .lcomm foo2_l,8,foo2[UL]
+
+  /* .tdata */
+  .globl bar[TL]
+  .csect bar[TL]
+  .long 1
diff --git a/ld/testsuite/ld-powerpc/aix52.exp b/ld/testsuite/ld-powerpc/aix52.exp
index 3dfbae0..0e68b6a 100644
--- a/ld/testsuite/ld-powerpc/aix52.exp
+++ b/ld/testsuite/ld-powerpc/aix52.exp
@@ -275,6 +275,16 @@ set aix7tests {
 	"" {aix-largetoc-1.s}
 	{{objdump -dr aix-largetoc-1-SIZE.d}}
 	"aix-largetoc-1.so"}
+
+    {"TLS relocations" "-shared -bE:aix-tls-reloc.ex"
+	"" {aix-tls-reloc.s}
+	{{objdump -dr aix-tls-reloc-SIZE.d}}
+	"aix-tls-reloc.so"}
+
+    {"TLS section" "-shared -bE:aix-tls-section.ex"
+	"" {aix-tls-section.s}
+	{{objdump -hw aix-tls-section-SIZE.d}}
+	"aix-tls-section.so"}
 }
 
 foreach test $aix7tests {