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, 156 insertions, 0 deletions

diff --git a/ld/testsuite/ld-i386/tlsbin2-nacl.rd b/ld/testsuite/ld-i386/tlsbin2-nacl.rd
new file mode 100644
index 0000000..b23bfe0
--- /dev/null
+++ b/ld/testsuite/ld-i386/tlsbin2-nacl.rd
@@ -0,0 +1,156 @@
+#source: tlsbinpic2.s
+#source: tlsbin.s
+#as: --32
+#ld: -melf_i386_nacl tmpdir/libtlslib.so --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 +PROGBITS +0+20000 .*
+ +\[[ 0-9]+\] \.interp +.*
+ +\[[ 0-9]+\] \.hash +.*
+ +\[[ 0-9]+\] \.dynsym +.*
+ +\[[ 0-9]+\] \.dynstr +.*
+ +\[[ 0-9]+\] \.rel.dyn +.*
+ +\[[ 0-9]+\] \.tdata +PROGBITS +0*10031000 [0-9a-f]+ 000060 00 WAT +0 +0 4096
+ +\[[ 0-9]+\] \.tbss +NOBITS +[0-9a-f]+ [0-9a-f]+ 000040 00 WAT +0 +0 +1
+ +\[[ 0-9]+\] \.dynamic +DYNAMIC +0*10031060 .*
+ +\[[ 0-9]+\] \.got +PROGBITS +0*100310e0 .*
+ +\[[ 0-9]+\] \.got\.plt +PROGBITS +0*10031108 .*
+ +\[[ 0-9]+\] \.shstrtab +.*
+ +\[[ 0-9]+\] \.symtab +.*
+ +\[[ 0-9]+\] \.strtab +.*
+Key to Flags:
+#...
+
+Elf file type is EXEC \(Executable file\)
+Entry point 0x0*20188
+There are [0-9]+ program headers, starting at offset [0-9]+
+
+Program Headers:
+ +Type +Offset +VirtAddr +PhysAddr +FileSiz +MemSiz +Flg Align
+ +PHDR.*
+ +INTERP.*
+.*Requesting program interpreter.*
+ +LOAD.*
+ +LOAD.*
+ +LOAD.*
+ +DYNAMIC.*
+ +TLS +0x[0-9a-f]+ 0x[0-9a-f]+ 0x[0-9a-f]+ 0x0+60 0x0+a0 R +0x1000
+
+ Section to Segment mapping:
+ +Segment Sections...
+ +00 +
+ +01 +.interp *
+ +02 +.text *
+ +03 +.interp .hash .dynsym .dynstr .rel.dyn *
+ +04 +.tdata .dynamic .got .got.plt *
+ +05 +.dynamic *
+ +06 +.tdata .tbss *
+
+Relocation section '.rel.dyn' at offset 0x[0-9a-f]+ contains 10 entries:
+ Offset +Info +Type +Sym.Value +Sym. Name
+[0-9a-f ]+R_386_TLS_TPOFF +0+ +sG3
+[0-9a-f ]+R_386_TLS_TPOFF +0+ +sG5
+[0-9a-f ]+R_386_TLS_TPOFF +0+ +sG7
+[0-9a-f ]+R_386_TLS_TPOFF32 0+ +sG2
+[0-9a-f ]+R_386_TLS_TPOFF32 0+ +sG4
+[0-9a-f ]+R_386_TLS_TPOFF +0+ +sG4
+[0-9a-f ]+R_386_TLS_TPOFF32 0+ +sG6
+[0-9a-f ]+R_386_TLS_TPOFF32 0+ +sG1
+[0-9a-f ]+R_386_TLS_TPOFF +0+ +sG8
+[0-9a-f ]+R_386_GLOB_DAT +[0-9a-f]+ +___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+ +0 +TLS +GLOBAL +DEFAULT +UND sG3
+ +[0-9]+: 0+ +0 +TLS +GLOBAL +DEFAULT +UND sG5
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+ +[0-9]+: 0+ +0 +TLS +GLOBAL +DEFAULT +UND sG1
+ +[0-9]+: [0-9a-f]+ +0 +NOTYPE +GLOBAL +DEFAULT +11 _edata
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+ +[0-9]+: [0-9a-f]+ +0 +FUNC +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 *
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+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +6 *
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+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +8 *
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+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +10 *
+ +[0-9]+: [0-9a-f]+ +0 +SECTION +LOCAL +DEFAULT +11 *
+.* FILE +LOCAL +DEFAULT +ABS tmpdir/tlsbinpic2.o
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