Support x86-64 TLS code sequences without PLT
authorH.J. Lu <hjl.tools@gmail.com>
Mon, 6 Jun 2016 18:06:55 +0000 (11:06 -0700)
committerH.J. Lu <hjl.tools@gmail.com>
Mon, 6 Jun 2016 18:07:16 +0000 (11:07 -0700)
commite2cbcd9156d1606a9f2153aecd93a89fe6e29180
treecec6f8df1fc2f76e2bd1daeba8979ecac5580f19
parent67cb102be0846384ebe3c17ca19669deee2cdda8
Support x86-64 TLS code sequences without PLT

We can generate x86-64 TLS code sequences for general and local dynamic
models without PLT, which uses indirect call via GOT:

call *__tls_get_addr@GOTPCREL(%rip)

instead of direct call:

call __tls_get_addr[@PLT]

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, one 0x66 prefix before call instruction is
removed 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
4 0x66 prefixes, instead of 3, before mov instruction in 64-bit and
generate a 5-byte nop, instead of 4-byte, before mov instruction in
32-bit.  Since linker may convert

call *__tls_get_addr@GOTPCREL(%rip)

to

addr32 call __tls_get_addr

when producing static executable, both patterns are recognized.

bfd/

* elf64-x86-64.c (elf_x86_64_link_hash_entry): Add tls_get_addr.
(elf_x86_64_link_hash_newfunc): Initialize tls_get_addr to 2.
(elf_x86_64_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_x86_64_convert_load_reloc): Always use addr32 prefix for
indirect __tls_get_addr call via GOT.
(elf_x86_64_relocate_section): Handle GD->LE, GD->IE and LD->LE
transitions with indirect call and direct call with the addr32
prefix.

ld/

* testsuite/ld-x86-64/pass.out: New file.
* testsuite/ld-x86-64/tls-def1.c: Likewise.
* testsuite/ld-x86-64/tls-gd1.S: Likewise.
* testsuite/ld-x86-64/tls-ld1.S: Likewise.
* testsuite/ld-x86-64/tls-main1.c: Likewise.
* testsuite/ld-x86-64/tls.exp: Likewise.
* testsuite/ld-x86-64/tlsbin2-nacl.rd: Likewise.
* testsuite/ld-x86-64/tlsbin2.dd: Likewise.
* testsuite/ld-x86-64/tlsbin2.rd: Likewise.
* testsuite/ld-x86-64/tlsbin2.sd: Likewise.
* testsuite/ld-x86-64/tlsbin2.td: Likewise.
* testsuite/ld-x86-64/tlsbinpic2.s: Likewise.
* testsuite/ld-x86-64/tlsgd10.dd: Likewise.
* testsuite/ld-x86-64/tlsgd10.s: Likewise.
* testsuite/ld-x86-64/tlsgd11.dd: Likewise.
* testsuite/ld-x86-64/tlsgd11.s: Likewise.
* testsuite/ld-x86-64/tlsgd12.d: Likewise.
* testsuite/ld-x86-64/tlsgd12.s: Likewise.
* testsuite/ld-x86-64/tlsgd13.d: Likewise.
* testsuite/ld-x86-64/tlsgd13.s: Likewise.
* testsuite/ld-x86-64/tlsgd14.dd: Likewise.
* testsuite/ld-x86-64/tlsgd14.s: Likewise.
* testsuite/ld-x86-64/tlsgd5c.s: Likewise.
* testsuite/ld-x86-64/tlsgd6c.s: Likewise.
* testsuite/ld-x86-64/tlsgd9.dd: Likewise.
* testsuite/ld-x86-64/tlsgd9.s: Likewise.
* testsuite/ld-x86-64/tlsld4.dd: Likewise.
* testsuite/ld-x86-64/tlsld4.s: Likewise.
* testsuite/ld-x86-64/tlsld5.dd: Likewise.
* testsuite/ld-x86-64/tlsld5.s: Likewise.
* testsuite/ld-x86-64/tlsld6.dd: Likewise.
* testsuite/ld-x86-64/tlsld6.s: Likewise.
* testsuite/ld-x86-64/tlspic2-nacl.rd: Likewise.
* testsuite/ld-x86-64/tlspic2.dd: Likewise.
* testsuite/ld-x86-64/tlspic2.rd: Likewise.
* testsuite/ld-x86-64/tlspic2.sd: Likewise.
* testsuite/ld-x86-64/tlspic2.td: Likewise.
* testsuite/ld-x86-64/tlspic3.s: Likewise.
* testsuite/ld-x86-64/tlspie2.s: Likewise.
* testsuite/ld-x86-64/tlspie2a.d: Likewise.
* testsuite/ld-x86-64/tlspie2b.d: Likewise.
* testsuite/ld-x86-64/tlspie2c.d: Likewise.
* testsuite/ld-x86-64/tlsgd5.dd: Updated.
* testsuite/ld-x86-64/tlsgd6.dd: Likewise.
* testsuite/ld-x86-64/x86-64.exp: Run libtlspic2.so, tlsbin2,
tlsgd5b, tlsgd6b, tlsld4, tlsld5, tlsld6, tlsgd9, tlsgd10,
tlsgd11, tlsgd14, tlsgd12, tlsgd13, tlspie2a, tlspie2b and
tlspie2c.
48 files changed:
bfd/ChangeLog
bfd/elf64-x86-64.c
ld/ChangeLog
ld/testsuite/ld-x86-64/pass.out [new file with mode: 0644]
ld/testsuite/ld-x86-64/tls-def1.c [new file with mode: 0644]
ld/testsuite/ld-x86-64/tls-gd1.S [new file with mode: 0644]
ld/testsuite/ld-x86-64/tls-ld1.S [new file with mode: 0644]
ld/testsuite/ld-x86-64/tls-main1.c [new file with mode: 0644]
ld/testsuite/ld-x86-64/tls.exp [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbin2-nacl.rd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbin2.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbin2.rd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbin2.sd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbin2.td [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsbinpic2.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd10.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd10.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd11.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd11.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd12.d [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd12.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd13.d [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd13.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd14.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd14.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd5.dd
ld/testsuite/ld-x86-64/tlsgd5c.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd6.dd
ld/testsuite/ld-x86-64/tlsgd6c.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd9.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsgd9.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld4.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld4.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld5.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld5.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld6.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlsld6.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic2-nacl.rd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic2.dd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic2.rd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic2.sd [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic2.td [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspic3.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspie2.s [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspie2a.d [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspie2b.d [new file with mode: 0644]
ld/testsuite/ld-x86-64/tlspie2c.d [new file with mode: 0644]
ld/testsuite/ld-x86-64/x86-64.exp