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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-06-08 11:59:47 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-06-08 12:01:50 -0700 |
| commit | 6eaa7fb59b32beaca017abf139a67bbe87592d9b (patch) | |
| tree | 41d99fa60a1380cb5acc9290a014508f2852859b /ld/testsuite/ld-i386/tlspie3c.d | |
| parent | 010bc3ce6c651455e3a27c0857021c228780523c (diff) | |
| download | gdb-6eaa7fb59b32beaca017abf139a67bbe87592d9b.zip gdb-6eaa7fb59b32beaca017abf139a67bbe87592d9b.tar.gz gdb-6eaa7fb59b32beaca017abf139a67bbe87592d9b.tar.bz2 | |
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.
Diffstat (limited to 'ld/testsuite/ld-i386/tlspie3c.d')
| -rw-r--r-- | ld/testsuite/ld-i386/tlspie3c.d | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/ld/testsuite/ld-i386/tlspie3c.d b/ld/testsuite/ld-i386/tlspie3c.d new file mode 100644 index 0000000..aa02f57 --- /dev/null +++ b/ld/testsuite/ld-i386/tlspie3c.d @@ -0,0 +1,37 @@ +#source: tlspie3.s +#as: --32 -mrelax-relocations=yes +#ld: -melf_i386 -pie -z call-nop=suffix-nop +#objdump: -dwr + +.*: +file format .* + + +Disassembly of section .text: + +[0-9a-f]+ <___tls_get_addr>: +[ ]*[a-f0-9]+: c3 ret + +[0-9a-f]+ <_start>: +[ ]*[a-f0-9]+: 55 push %ebp +[ ]*[a-f0-9]+: 89 e5 mov %esp,%ebp +[ ]*[a-f0-9]+: 56 push %esi +[ ]*[a-f0-9]+: 53 push %ebx +[ ]*[a-f0-9]+: e8 00 00 00 00 call [0-9a-f]+ .* +[ ]*[a-f0-9]+: 5b pop %ebx +[ ]*[a-f0-9]+: 81 c3 ([0-9a-f]{2} ){4}[ ]+add \$0x[0-9a-f]+,%ebx +[ ]*[a-f0-9]+: 65 8b 35 f0 ff ff ff mov %gs:0xfffffff0,%esi +[ ]*[a-f0-9]+: 65 03 35 ec ff ff ff add %gs:0xffffffec,%esi +[ ]*[a-f0-9]+: c7 c0 f4 ff ff ff mov \$0xfffffff4,%eax +[ ]*[a-f0-9]+: 65 03 30 add %gs:\(%eax\),%esi +[ ]*[a-f0-9]+: 65 a1 00 00 00 00 mov %gs:0x0,%eax +[ ]*[a-f0-9]+: 8d b6 00 00 00 00 lea 0x0\(%esi\),%esi +[ ]*[a-f0-9]+: 03 30 add \(%eax\),%esi +[ ]*[a-f0-9]+: 65 a1 00 00 00 00 mov %gs:0x0,%eax +[ ]*[a-f0-9]+: 81 e8 04 00 00 00 sub \$0x4,%eax +[ ]*[a-f0-9]+: 03 30 add \(%eax\),%esi +[ ]*[a-f0-9]+: 89 f0 mov %esi,%eax +[ ]*[a-f0-9]+: 5b pop %ebx +[ ]*[a-f0-9]+: 5e pop %esi +[ ]*[a-f0-9]+: c9 leave +[ ]*[a-f0-9]+: c3 ret +#pass |