Support i386 TLS code sequences without PLT

We can generate i386 TLS code sequences for general and local dynamic
models without PLT, which uses indirect call via GOT:

call *___tls_get_addr@GOT(%reg)

where EBX register isn't required as GOT base, instead of direct call:

call ___tls_get_addr[@PLT]

which requires EBX register as GOT base.

Since direct call is 4-byte long and indirect call, is 5-byte long, the
extra one byte must be handled properly.

For general dynamic model, 7-byte lea instruction before call instruction
is replaced by 6-byte one to make room for indirect call.  For local
dynamic model, we simply use 5-byte indirect call.

TLS linker optimization is updated to recognize new instruction patterns.
For local dynamic model to local exec model transition, we generate
a 6-byte lea instruction as nop, instead of a 1-byte nop plus a 4-byte
lea instruction.  Since linker may convert

call ___tls_get_addr[@PLT]

to

addr32 call ____tls_get_addr

when producing static executable, both patterns are recognized.

bfd/

	* elf64-i386.c (elf_i386_link_hash_entry): Add tls_get_addr.
	(elf_i386_link_hash_newfunc): Initialize tls_get_addr to 2.
	(elf_i386_check_tls_transition): Check indirect call and direct
	call with the addr32 prefix for general and local dynamic models.
	Set the tls_get_addr feild.
	(elf_i386_convert_load_reloc): Always use addr32 prefix for
	indirect ___tls_get_addr call via GOT.
	(elf_i386_relocate_section): Handle GD->LE, GD->IE and LD->LE
	transitions with indirect call and direct call with the addr32
	prefix.

ld/

	* testsuite/ld-i386/i386.exp: Run libtlspic2.so, tlsbin2,
	tlsgd3, tlsld2, tlsgd4, tlspie3a, tlspie3b and tlspie3c.
	* testsuite/ld-i386/pass.out: New file.
	* testsuite/ld-i386/tls-def1.c: Likewise.
	* testsuite/ld-i386/tls-gd1.S: Likewise.
	* testsuite/ld-i386/tls-ld1.S: Likewise.
	* testsuite/ld-i386/tls-main1.c: Likewise.
	* testsuite/ld-i386/tls.exp: Likewise.
	* testsuite/ld-i386/tlsbin2-nacl.rd: Likewise.
	* testsuite/ld-i386/tlsbin2.dd: Likewise.
	* testsuite/ld-i386/tlsbin2.rd: Likewise.
	* testsuite/ld-i386/tlsbin2.sd: Likewise.
	* testsuite/ld-i386/tlsbin2.td: Likewise.
	* testsuite/ld-i386/tlsbinpic2.s: Likewise.
	* testsuite/ld-i386/tlsgd3.dd: Likewise.
	* testsuite/ld-i386/tlsgd3.s: Likewise.
	* testsuite/ld-i386/tlsgd4.d: Likewise.
	* testsuite/ld-i386/tlsgd4.s: Likewise.
	* testsuite/ld-i386/tlsld2.s: Likewise.
	* testsuite/ld-i386/tlspic2-nacl.rd: Likewise.
	* testsuite/ld-i386/tlspic2.dd: Likewise.
	* testsuite/ld-i386/tlspic2.rd: Likewise.
	* testsuite/ld-i386/tlspic2.sd: Likewise.
	* testsuite/ld-i386/tlspic2.td: Likewise.
	* testsuite/ld-i386/tlspic3.s: Likewise.
	* testsuite/ld-i386/tlspie3.s: Likewise.
	* testsuite/ld-i386/tlspie3a.d: Likewise.
	* testsuite/ld-i386/tlspie3b.d: Likewise.
	* testsuite/ld-i386/tlspie3c.d: Likewise.

1 files changed, 149 insertions, 0 deletions

diff --git a/ld/testsuite/ld-i386/tlspic2-nacl.rd b/ld/testsuite/ld-i386/tlspic2-nacl.rd
new file mode 100644
index 0000000..560e840
--- /dev/null
+++ b/ld/testsuite/ld-i386/tlspic2-nacl.rd
@@ -0,0 +1,149 @@
+#source: tlspic3.s
+#source: tlspic2.s
+#as: --32
+#ld: -shared -melf_i386_nacl --no-ld-generated-unwind-info
+#readelf: -Ssrl
+#target: i?86-*-nacl*
+
+There are [0-9]+ section headers, starting at offset 0x[0-9a-f]+:
+
+Section Headers:
+ +\[Nr\] Name +Type +Addr +Off +Size +ES Flg Lk Inf Al
+ +\[[ 0-9]+\] +NULL +0+ 0+ 0+ 0+ +0 +0 +0
+ +\[[ 0-9]+\] \.text +.*
+ +\[[ 0-9]+\] \.hash +.*
+ +\[[ 0-9]+\] \.dynsym +.*
+ +\[[ 0-9]+\] \.dynstr +.*
+ +\[[ 0-9]+\] \.rel.dyn +.*
+ +\[[ 0-9]+\] \.tdata +PROGBITS +[0-9a-f]+ [0-9a-f]+ 000060 00 WAT +0 +0 +1
+ +\[[ 0-9]+\] \.tbss +NOBITS +[0-9aa-f]+ [0-9a-f]+ 000020 00 WAT +0 +0 +1
+ +\[[ 0-9]+\] \.dynamic +.*
+ +\[[ 0-9]+\] \.got +.*
+ +\[[ 0-9]+\] \.got.plt +.*
+ +\[[ 0-9]+\] \.shstrtab +.*
+ +\[[ 0-9]+\] \.symtab +.*
+ +\[[ 0-9]+\] \.strtab +.*
+Key to Flags:
+#...
+
+Elf file type is DYN \(Shared object file\)
+Entry point 0x[0-9a-f]+
+There are [0-9]+ program headers, starting at offset [0-9]+
+
+Program Headers:
+ +Type +Offset +VirtAddr +PhysAddr +FileSiz +MemSiz +Flg Align
+ +LOAD.*
+ +LOAD.*
+ +LOAD.*
+ +DYNAMIC.*
+ +TLS +0x[0-9a-f]+ 0x[0-9a-f]+ 0x[0-9a-f]+ 0x0+60 0x0+80 R +0x1
+
+ Section to Segment mapping:
+ +Segment Sections...
+ +00 +.text *
+ +01 +.hash .dynsym .dynstr .rel.dyn *
+ +02 +.tdata .dynamic .got .got.plt *
+ +03 +.dynamic *
+ +04 +.tdata .tbss *
+
+Relocation section '.rel.dyn' at offset 0x[0-9a-f]+ contains 27 entries:
+ Offset +Info +Type +Sym.Value +Sym. Name
+[0-9a-f ]+R_386_TLS_DTPMOD3
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_DTPMOD3
+[0-9a-f ]+R_386_TLS_DTPMOD3
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_TPOFF *
+[0-9a-f ]+R_386_TLS_DTPMOD3
+[0-9a-f ]+R_386_TLS_TPOFF32
+[0-9a-f ]+R_386_TLS_TPOFF +0+8 +sg3
+[0-9a-f ]+R_386_TLS_TPOFF32 0+c +sg4
+[0-9a-f ]+R_386_TLS_TPOFF +0+c +sg4
+[0-9a-f ]+R_386_TLS_TPOFF +0+10 +sg5
+[0-9a-f ]+R_386_TLS_DTPMOD3 0+ +sg1
+[0-9a-f ]+R_386_TLS_DTPOFF3 0+ +sg1
+[0-9a-f ]+R_386_TLS_TPOFF32 0+4 +sg2
+[0-9a-f ]+R_386_GLOB_DAT +0+ +___tls_get_addr
+
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size +Type +Bind +Vis +Ndx +Name
+ +[0-9]+: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND *
+ +[0-9]+: 0+1c +0 +TLS +GLOBAL +DEFAULT +6 sg8
+ +[0-9]+: 0+8 +0 +TLS +GLOBAL +DEFAULT +6 sg3
+ +[0-9]+: 0+c +0 +TLS +GLOBAL +DEFAULT +6 sg4
+ +[0-9]+: 0+10 +0 +TLS +GLOBAL +DEFAULT +6 sg5
+ +[0-9]+: 0+ +0 +TLS +GLOBAL +DEFAULT +6 sg1
+ +[0-9]+: [0-9a-f]+ +0 +FUNC +GLOBAL +DEFAULT +1 fn1
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 __bss_start
+ +[0-9]+: 0+4 +0 +TLS +GLOBAL +DEFAULT +6 sg2
+ +[0-9]+: 0+14 +0 +TLS +GLOBAL +DEFAULT +6 sg6
+ +[0-9]+: 0+18 +0 +TLS +GLOBAL +DEFAULT +6 sg7
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 _edata
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 _end
+ +[0-9]+: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +UND ___tls_get_addr
+
+Symbol table '\.symtab' contains [0-9]+ entries:
+ +Num: +Value +Size +Type +Bind +Vis +Ndx +Name
+ +[0-9]+: 0+ +0 +NOTYPE +LOCAL +DEFAULT +UND *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +1 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +2 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +3 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +4 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +5 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +6 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +7 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +8 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +9 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +10 *
+.* FILE +LOCAL +DEFAULT +ABS tmpdir/tlspic3.o
+ +[0-9]+: 0+20 +0 +TLS +LOCAL +DEFAULT +6 sl1
+ +[0-9]+: 0+24 +0 +TLS +LOCAL +DEFAULT +6 sl2
+ +[0-9]+: 0+28 +0 +TLS +LOCAL +DEFAULT +6 sl3
+ +[0-9]+: 0+2c +0 +TLS +LOCAL +DEFAULT +6 sl4
+ +[0-9]+: 0+30 +0 +TLS +LOCAL +DEFAULT +6 sl5
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+ +[0-9]+: 0+38 +0 +TLS +LOCAL +DEFAULT +6 sl7
+ +[0-9]+: 0+3c +0 +TLS +LOCAL +DEFAULT +6 sl8
+.* FILE +LOCAL +DEFAULT +ABS 
+ +[0-9]+: 0+60 +0 +TLS +LOCAL +DEFAULT +7 sH1
+ +[0-9]+: [0-9a-f]+ +0 +OBJECT +LOCAL +DEFAULT +8 _DYNAMIC
+ +[0-9]+: 0+48 +0 +TLS +LOCAL +DEFAULT +6 sh3
+ +[0-9]+: 0+64 +0 +TLS +LOCAL +DEFAULT +7 sH2
+ +[0-9]+: 0+78 +0 +TLS +LOCAL +DEFAULT +7 sH7
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+ +[0-9]+: 0+68 +0 +TLS +LOCAL +DEFAULT +7 sH3
+ +[0-9]+: 0+50 +0 +TLS +LOCAL +DEFAULT +6 sh5
+ +[0-9]+: 0+70 +0 +TLS +LOCAL +DEFAULT +7 sH5
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+ +[0-9]+: 0+7c +0 +TLS +LOCAL +DEFAULT +7 sH8
+ +[0-9]+: 0+40 +0 +TLS +LOCAL +DEFAULT +6 sh1
+ +[0-9]+: [0-9a-f]+ +0 +OBJECT +LOCAL +DEFAULT +10 _GLOBAL_OFFSET_TABLE_
+ +[0-9]+: 0+44 +0 +TLS +LOCAL +DEFAULT +6 sh2
+ +[0-9]+: 0+54 +0 +TLS +LOCAL +DEFAULT +6 sh6
+ +[0-9]+: 0+1c +0 +TLS +GLOBAL +DEFAULT +6 sg8
+ +[0-9]+: 0+8 +0 +TLS +GLOBAL +DEFAULT +6 sg3
+ +[0-9]+: 0+c +0 +TLS +GLOBAL +DEFAULT +6 sg4
+ +[0-9]+: 0+10 +0 +TLS +GLOBAL +DEFAULT +6 sg5
+ +[0-9]+: 0+ +0 +TLS +GLOBAL +DEFAULT +6 sg1
+ +[0-9]+: [0-9a-f]+ +0 +FUNC +GLOBAL +DEFAULT +1 fn1
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 __bss_start
+ +[0-9]+: 0+4 +0 +TLS +GLOBAL +DEFAULT +6 sg2
+ +[0-9]+: 0+14 +0 +TLS +GLOBAL +DEFAULT +6 sg6
+ +[0-9]+: 0+18 +0 +TLS +GLOBAL +DEFAULT +6 sg7
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 _edata
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +10 _end
+ +[0-9]+: 0+ +0 +NOTYPE +GLOBAL +DEFAULT +UND ___tls_get_addr