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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.
38 lines
1.4 KiB
D
38 lines
1.4 KiB
D
#source: tlspie3.s
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#as: --32 -mrelax-relocations=yes
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#ld: -melf_i386 -pie
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#objdump: -dwr
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.*: +file format .*
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Disassembly of section .text:
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[0-9a-f]+ <___tls_get_addr>:
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[ ]*[a-f0-9]+: c3 ret
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[0-9a-f]+ <_start>:
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[ ]*[a-f0-9]+: 55 push %ebp
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[ ]*[a-f0-9]+: 89 e5 mov %esp,%ebp
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[ ]*[a-f0-9]+: 56 push %esi
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[ ]*[a-f0-9]+: 53 push %ebx
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[ ]*[a-f0-9]+: e8 00 00 00 00 call [0-9a-f]+ .*
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[ ]*[a-f0-9]+: 5b pop %ebx
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[ ]*[a-f0-9]+: 81 c3 ([0-9a-f]{2} ){4}[ ]+add \$0x[0-9a-f]+,%ebx
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[ ]*[a-f0-9]+: 65 8b 35 f0 ff ff ff mov %gs:0xfffffff0,%esi
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[ ]*[a-f0-9]+: 65 03 35 ec ff ff ff add %gs:0xffffffec,%esi
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[ ]*[a-f0-9]+: c7 c0 f4 ff ff ff mov \$0xfffffff4,%eax
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[ ]*[a-f0-9]+: 65 03 30 add %gs:\(%eax\),%esi
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[ ]*[a-f0-9]+: 65 a1 00 00 00 00 mov %gs:0x0,%eax
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[ ]*[a-f0-9]+: 8d b6 00 00 00 00 lea 0x0\(%esi\),%esi
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[ ]*[a-f0-9]+: 03 30 add \(%eax\),%esi
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[ ]*[a-f0-9]+: 65 a1 00 00 00 00 mov %gs:0x0,%eax
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[ ]*[a-f0-9]+: 81 e8 04 00 00 00 sub \$0x4,%eax
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[ ]*[a-f0-9]+: 03 30 add \(%eax\),%esi
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[ ]*[a-f0-9]+: 89 f0 mov %esi,%eax
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[ ]*[a-f0-9]+: 5b pop %ebx
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[ ]*[a-f0-9]+: 5e pop %esi
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[ ]*[a-f0-9]+: c9 leave
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[ ]*[a-f0-9]+: c3 ret
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#pass
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