PowerPC64 tls_get_addr_desc static support

This provides a linker generated __tls_get_addr_desc wrapper function
preserving registers around a __tls_get_addr call.  The idea being to
support __tls_get_addr_desc without requiring a glibc update.

bfd/
	* elf64-ppc.c (struct ppc_link_hash_table): Add tga_group.
	(ppc64_elf_archive_symbol_lookup): Extract __tls_get_addr_opt for
	__tls_get_addr_desc.
	(ppc64_elf_size_stubs): Add section for linker generated
	__tls_get_addr_desc wrapper function.  Loop at least once if
	generating this function.
	(emit_tga_desc, emit_tga_desc_eh_frame): New functions.
	(ppc64_elf_build_stubs): Generate __tls_get_addr_desc.
ld/
	* testsuite/ld-powerpc/tlsdesc3.d,
	* testsuite/ld-powerpc/tlsdesc3.wf,
	* testsuite/ld-powerpc/tlsdesc4.d,
	* testsuite/ld-powerpc/tlsdesc4.s,
	* testsuite/ld-powerpc/tlsdesc4.wf: New tests.
	* testsuite/ld-powerpc/powerpc.exp: Run them.

7 files changed, 209 insertions, 0 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index edfc090..b196d21 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,5 +1,14 @@
 2020-01-22  Alan Modra  <amodra@gmail.com>
 
+	* testsuite/ld-powerpc/tlsdesc3.d,
+	* testsuite/ld-powerpc/tlsdesc3.wf,
+	* testsuite/ld-powerpc/tlsdesc4.d,
+	* testsuite/ld-powerpc/tlsdesc4.s,
+	* testsuite/ld-powerpc/tlsdesc4.wf: New tests.
+	* testsuite/ld-powerpc/powerpc.exp: Run them.
+
+2020-01-22  Alan Modra  <amodra@gmail.com>
+
 	* emultempl/ppc64elf.em (ppc64_opt, PARSE_AND_LIST_LONGOPTS),
 	(PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_ARGS_CASES): Support
 	--tls-get-addr-regsave and --no-tls-get-addr-regsave.
diff --git a/ld/testsuite/ld-powerpc/powerpc.exp b/ld/testsuite/ld-powerpc/powerpc.exp
index d50846c..94b2fac 100644
--- a/ld/testsuite/ld-powerpc/powerpc.exp
+++ b/ld/testsuite/ld-powerpc/powerpc.exp
@@ -280,6 +280,12 @@ set ppc64elftests {
     {"TLSdesc2" "-melf64ppc -shared --hash-style=both --no-plt-localentry tmpdir/tlsdll.so" "" "-a64"  {tlsdesc.s}
      {{objdump -dr tlsdesc2.d} {readelf -wf tlsdesc2.wf}}
      "tlsdesc2"}
+    {"TLSdesc3" "-melf64ppc --no-tls-optimize tmpdir/tlsdll.o" "" "-a64"  {tlsdesc.s}
+     {{objdump -dr tlsdesc3.d} {readelf -wf tlsdesc3.wf}}
+     "tlsdesc3"}
+    {"TLSdesc4" "-melf64ppc --no-tls-optimize tmpdir/tlsdll.o" "" "-a64"  {tlsdesc4.s}
+     {{objdump -dr tlsdesc4.d} {readelf -wf tlsdesc4.wf}}
+     "tlsdesc4"}
     {"sym@tocbase" "-shared -melf64ppc" "" "-a64" {symtocbase-1.s symtocbase-2.s}
 	{{objdump -dj.data symtocbase.d}} "symtocbase.so"}
     {"TOC opt" "-melf64ppc" "" "-a64"  {tocopt.s}
diff --git a/ld/testsuite/ld-powerpc/tlsdesc3.d b/ld/testsuite/ld-powerpc/tlsdesc3.d
new file mode 100644
index 0000000..360dcff
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc3.d
@@ -0,0 +1,38 @@
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+10000100 <__tls_get_addr_desc>:
+.*:	(7c 08 02 a6|a6 02 08 7c) 	mflr    r0
+.*:	(f8 01 00 10|10 00 01 f8) 	std     r0,16\(r1\)
+.*:	(f8 81 ff c0|c0 ff 81 f8) 	std     r4,-64\(r1\)
+.*:	(f8 a1 ff c8|c8 ff a1 f8) 	std     r5,-56\(r1\)
+.*:	(f8 c1 ff d0|d0 ff c1 f8) 	std     r6,-48\(r1\)
+.*:	(f8 e1 ff d8|d8 ff e1 f8) 	std     r7,-40\(r1\)
+.*:	(f9 01 ff e0|e0 ff 01 f9) 	std     r8,-32\(r1\)
+.*:	(f9 21 ff e8|e8 ff 21 f9) 	std     r9,-24\(r1\)
+.*:	(f9 41 ff f0|f0 ff 41 f9) 	std     r10,-16\(r1\)
+.*:	(f9 61 ff f8|f8 ff 61 f9) 	std     r11,-8\(r1\)
+.*:	(f8 21 ff a1|a1 ff 21 f8) 	stdu    r1,-96\(r1\)
+.*:	(48 00 00 35|35 00 00 48) 	bl      .* <__tls_get_addr>
+.*:	(e8 81 00 20|20 00 81 e8) 	ld      r4,32\(r1\)
+.*:	(e8 a1 00 28|28 00 a1 e8) 	ld      r5,40\(r1\)
+.*:	(e8 c1 00 30|30 00 c1 e8) 	ld      r6,48\(r1\)
+.*:	(e8 e1 00 38|38 00 e1 e8) 	ld      r7,56\(r1\)
+.*:	(e9 01 00 40|40 00 01 e9) 	ld      r8,64\(r1\)
+.*:	(e9 21 00 48|48 00 21 e9) 	ld      r9,72\(r1\)
+.*:	(e9 41 00 50|50 00 41 e9) 	ld      r10,80\(r1\)
+.*:	(e9 61 00 58|58 00 61 e9) 	ld      r11,88\(r1\)
+.*:	(38 21 00 60|60 00 21 38) 	addi    r1,r1,96
+.*:	(e8 01 00 10|10 00 01 e8) 	ld      r0,16\(r1\)
+.*:	(7c 08 03 a6|a6 03 08 7c) 	mtlr    r0
+.*:	(4e 80 00 20|20 00 80 4e) 	blr
+
+0+10000160 <__tls_get_addr>:
+.*:	(4e 80 00 20|20 00 80 4e) 	blr
+
+0+10000164 <_start>:
+.*:	(38 62 80 08|08 80 62 38) 	addi    r3,r2,-32760
+.*:	(4b ff ff 99|99 ff ff 4b) 	bl      .* <__tls_get_addr_desc>
+.*:	(60 00 00 00|00 00 00 60) 	nop
diff --git a/ld/testsuite/ld-powerpc/tlsdesc3.wf b/ld/testsuite/ld-powerpc/tlsdesc3.wf
new file mode 100644
index 0000000..af5a6b4
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc3.wf
@@ -0,0 +1,43 @@
+Contents of the \.eh_frame section:
+
+0+ 0+10 0+ CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 65
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r1 ofs 0
+
+0+14 0+34 0+18 FDE cie=0+ pc=0+10000100\.\.0+10000160
+  DW_CFA_advance_loc: 44 to 0+1000012c
+  DW_CFA_def_cfa_offset: 96
+  DW_CFA_offset_extended_sf: r65 at cfa\+16
+  DW_CFA_offset: r4 at cfa-64
+  DW_CFA_offset: r5 at cfa-56
+  DW_CFA_offset: r6 at cfa-48
+  DW_CFA_offset: r7 at cfa-40
+  DW_CFA_offset: r8 at cfa-32
+  DW_CFA_offset: r9 at cfa-24
+  DW_CFA_offset: r10 at cfa-16
+  DW_CFA_offset: r11 at cfa-8
+  DW_CFA_advance_loc: 40 to 0+10000154
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_restore: r4
+  DW_CFA_restore: r5
+  DW_CFA_restore: r6
+  DW_CFA_restore: r7
+  DW_CFA_restore: r8
+  DW_CFA_restore: r9
+  DW_CFA_restore: r10
+  DW_CFA_restore: r11
+  DW_CFA_advance_loc: 8 to 0+1000015c
+  DW_CFA_restore_extended: r65
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+4c 0+10 0+50 FDE cie=0+ pc=0+10000164\.\.0+10000170
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
diff --git a/ld/testsuite/ld-powerpc/tlsdesc4.d b/ld/testsuite/ld-powerpc/tlsdesc4.d
new file mode 100644
index 0000000..eb162bb
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc4.d
@@ -0,0 +1,46 @@
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+10000100 <__tls_get_addr_desc>:
+.*:	(7c 08 02 a6|a6 02 08 7c) 	mflr    r0
+.*:	(f8 01 00 10|10 00 01 f8) 	std     r0,16\(r1\)
+.*:	(f8 81 ff c0|c0 ff 81 f8) 	std     r4,-64\(r1\)
+.*:	(f8 a1 ff c8|c8 ff a1 f8) 	std     r5,-56\(r1\)
+.*:	(f8 c1 ff d0|d0 ff c1 f8) 	std     r6,-48\(r1\)
+.*:	(f8 e1 ff d8|d8 ff e1 f8) 	std     r7,-40\(r1\)
+.*:	(f9 01 ff e0|e0 ff 01 f9) 	std     r8,-32\(r1\)
+.*:	(f9 21 ff e8|e8 ff 21 f9) 	std     r9,-24\(r1\)
+.*:	(f9 41 ff f0|f0 ff 41 f9) 	std     r10,-16\(r1\)
+.*:	(f9 61 ff f8|f8 ff 61 f9) 	std     r11,-8\(r1\)
+.*:	(f8 21 ff a1|a1 ff 21 f8) 	stdu    r1,-96\(r1\)
+.*:	(48 00 00 35|35 00 00 48) 	bl      .* <__tls_get_addr>
+.*:	(e8 81 00 20|20 00 81 e8) 	ld      r4,32\(r1\)
+.*:	(e8 a1 00 28|28 00 a1 e8) 	ld      r5,40\(r1\)
+.*:	(e8 c1 00 30|30 00 c1 e8) 	ld      r6,48\(r1\)
+.*:	(e8 e1 00 38|38 00 e1 e8) 	ld      r7,56\(r1\)
+.*:	(e9 01 00 40|40 00 01 e9) 	ld      r8,64\(r1\)
+.*:	(e9 21 00 48|48 00 21 e9) 	ld      r9,72\(r1\)
+.*:	(e9 41 00 50|50 00 41 e9) 	ld      r10,80\(r1\)
+.*:	(e9 61 00 58|58 00 61 e9) 	ld      r11,88\(r1\)
+.*:	(38 21 00 60|60 00 21 38) 	addi    r1,r1,96
+.*:	(e8 01 00 10|10 00 01 e8) 	ld      r0,16\(r1\)
+.*:	(7c 08 03 a6|a6 03 08 7c) 	mtlr    r0
+.*:	(4e 80 00 20|20 00 80 4e) 	blr
+
+0+10000160 <__tls_get_addr>:
+.*:	(4e 80 00 20|20 00 80 4e) 	blr
+
+0+10000164 <_start>:
+.*:	(38 62 80 08|08 80 62 38) 	addi    r3,r2,-32760
+.*:	(4b ff ff 99|99 ff ff 4b) 	bl      .* <__tls_get_addr_desc>
+.*:	(60 00 00 00|00 00 00 60) 	nop
+	\.\.\.
+
+0+12000100 <.*\.long_branch\.__tls_get_addr_desc>:
+.*:	(4a 00 00 00|00 00 00 4a) 	b       .* <__tls_get_addr_desc>
+	\.\.\.
+.*:	(38 62 80 08|08 80 62 38) 	addi    r3,r2,-32760
+.*:	(4b ff ff dd|dd ff ff 4b) 	bl      .* <.*\.long_branch\.__tls_get_addr_desc>
+.*:	(60 00 00 00|00 00 00 60) 	nop
diff --git a/ld/testsuite/ld-powerpc/tlsdesc4.s b/ld/testsuite/ld-powerpc/tlsdesc4.s
new file mode 100644
index 0000000..6dc3082
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc4.s
@@ -0,0 +1,18 @@
+ .text
+ .globl _start
+_start:
+ .cfi_startproc
+ addi 3,2,gd@got@tlsgd
+ bl __tls_get_addr_desc(gd@tlsgd)
+ nop
+ .cfi_endproc
+
+ .section .text.pad1,"ax"
+ .space 0x1ffff90
+
+ .section .text.far,"ax"
+ .cfi_startproc
+ addi 3,2,gd@got@tlsgd
+ bl __tls_get_addr_desc(gd@tlsgd)
+ nop
+ .cfi_endproc
diff --git a/ld/testsuite/ld-powerpc/tlsdesc4.wf b/ld/testsuite/ld-powerpc/tlsdesc4.wf
new file mode 100644
index 0000000..8d24979
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/tlsdesc4.wf
@@ -0,0 +1,49 @@
+Contents of the \.eh_frame section:
+
+0+ 0+10 0+ CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 65
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r1 ofs 0
+
+0+14 0+34 0+18 FDE cie=0+ pc=0+10000100..0+10000160
+  DW_CFA_advance_loc: 44 to 0+1000012c
+  DW_CFA_def_cfa_offset: 96
+  DW_CFA_offset_extended_sf: r65 at cfa\+16
+  DW_CFA_offset: r4 at cfa-64
+  DW_CFA_offset: r5 at cfa-56
+  DW_CFA_offset: r6 at cfa-48
+  DW_CFA_offset: r7 at cfa-40
+  DW_CFA_offset: r8 at cfa-32
+  DW_CFA_offset: r9 at cfa-24
+  DW_CFA_offset: r10 at cfa-16
+  DW_CFA_offset: r11 at cfa-8
+  DW_CFA_advance_loc: 40 to 0+10000154
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_restore: r4
+  DW_CFA_restore: r5
+  DW_CFA_restore: r6
+  DW_CFA_restore: r7
+  DW_CFA_restore: r8
+  DW_CFA_restore: r9
+  DW_CFA_restore: r10
+  DW_CFA_restore: r11
+  DW_CFA_advance_loc: 8 to 0+1000015c
+  DW_CFA_restore_extended: r65
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+4c 0+10 0+50 FDE cie=0+ pc=0+10000164..0+10000170
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+60 0+10 0+64 FDE cie=0+ pc=0+12000120..0+1200012c
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+