mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-19 07:13:40 +08:00
f26a32876b
It is possible to create shared libraries on PowerPC using -ftls-model=inital-exec or -ftls-model=local-exec. The first is half reasonable, getting you a shared library that can't be dlopen'd but otherwise is reasonable. The second is quite bad. Not only do you lose being able to dlopen, the library also has dynamic text relocations. Worse, the TPREL16_LO, TPREL16_HA and other TPREL16 dynamic relocs emitted were wrong, resulting in wrong values being applied by ld.so. Using the first TLS section symbol in dynamic relocations for local TLS symbols doesn't work. It's wrong because TLS symbols used by TLS relocs have values relative to the TLS segment, whereas the TLS section symbols are addresses. This patch instead uses a symbol index of zero which is used elsewhere by PowerPC on dynamic TLS relocs. It's not strictly ABI compliant to use a non-TLS symbol with TLS relocs but symbol index zero can be interpreted as "no symbol". Not using the first TLS section symbol means it doesn't need to be dynamic. The patch also fixes a further problem with PowerPC32 dynamic TPREL16* relocs, which shouldn't have the symbol value in the addend as we do for non-TLS symbols. bfd/ * elflink.c (_bfd_elf_omit_section_dynsym_default): Don't keep tls_sec. (_bfd_elf_init_1_index_section): Prefer not using TLS sections. (_bfd_elf_init_2_index_sections): Likewise. * elf64-ppc.c (ppc64_elf_relocate_section): When emitting dynamic relocations for local TLS symbols, use STN_UNDEF as the relocation symbol. * elf32-ppc.c (ppc_elf_relocate_section): Likewise, and don't leave TLS symbol value in the addend. ld/ * testsuite/ld-powerpc/tlsso.r: Update. * testsuite/ld-powerpc/tlsso32.g: Update. * testsuite/ld-powerpc/tlsso32.r: Update. * testsuite/ld-powerpc/tlstocso.r: Update. * testsuite/ld-cris/tls-dso-dtpoffd2.d: Update. * testsuite/ld-cris/tls-dso-dtpoffd4.d: Update. * testsuite/ld-cris/tls-dso-tpoffgotcomm1.d: Update. * testsuite/ld-cris/tls-gd-1.d: Update. * testsuite/ld-cris/tls-gd-1h.d: Update. * testsuite/ld-cris/tls-gd-2.d: Update. * testsuite/ld-cris/tls-gd-2h.d: Update. * testsuite/ld-cris/tls-ie-10.d: Update. * testsuite/ld-cris/tls-ie-11.d: Update. * testsuite/ld-cris/tls-ie-8.d: Update. * testsuite/ld-cris/tls-ie-9.d: Update. * testsuite/ld-cris/tls-js1.d: Update. * testsuite/ld-cris/tls-ld-4.d: Update. * testsuite/ld-cris/tls-ld-5.d: Update. * testsuite/ld-cris/tls-ld-6.d: Update. * testsuite/ld-cris/tls-ld-7.d: Update. * testsuite/ld-cris/tls-ldgd-14.d: Update. * testsuite/ld-cris/tls-ldgd-15.d: Update. * testsuite/ld-cris/tls-ldgdx-14.d: Update. * testsuite/ld-cris/tls-ldgdx-15.d: Update. * testsuite/ld-cris/tls-local-54.d: Update. * testsuite/ld-cris/tls-local-60.d: Update. * testsuite/ld-cris/tls-local-61.d: Update. * testsuite/ld-cris/tls-local-63.d: Update. * testsuite/ld-cris/tls-local-64.d: Update. * testsuite/ld-cris/tls-ok-30.d: Update. * testsuite/ld-cris/tls-ok-32.d: Update. * testsuite/ld-cris/tls-ok-34.d: Update. * testsuite/ld-mips-elf/tls-multi-got-1.got: Update. * testsuite/ld-mips-elf/tls-multi-got-1.r: Update. * testsuite/ld-mips-elf/tlsdyn-pie-o32.d: Update. * testsuite/ld-mips-elf/tlsdyn-pie-o32.got: Update. * testsuite/ld-mips-elf/tlslib-o32-hidden.got: Update. * testsuite/ld-mips-elf/tlslib-o32-ver.got: Update. * testsuite/ld-mips-elf/tlslib-o32.got: Update. * testsuite/ld-s390/tlspic.rd: Update. * testsuite/ld-s390/tlspic_64.rd: Update. * testsuite/ld-sparc/tlssunnopic32.rd: Update. * testsuite/ld-sparc/tlssunnopic64.rd: Update. * testsuite/ld-sparc/tlssunpic32.rd: Update. * testsuite/ld-sparc/tlssunpic64.rd: Update.
33 lines
1.3 KiB
Makefile
33 lines
1.3 KiB
Makefile
#source: dsov32-1.s
|
|
#source: tls-ld-4.s
|
|
#source: dsov32-2.s
|
|
#source: expdyn1.s
|
|
#source: tls-hx.s
|
|
#source: dso-1.s
|
|
#as: --pic --no-underscore --em=criself --march=v32
|
|
#ld: --shared -m crislinux --hash-style=sysv
|
|
#readelf: -a
|
|
|
|
# DSO with a R_CRIS_16_DTPREL and a R_CRIS_32_PLT_PCREL. The .got.plt
|
|
# byte index (a) and .rela.plt item index (b) are in sync as b=a/4-3
|
|
# *except* when there's a R_CRIS_DTPMOD, because while the relocated
|
|
# contents goes in .got.plt, the relocation goes in .rela.got, not
|
|
# .rela.plt. And, it'd cover 8 bytes in .got.plt, not 4 bytes.
|
|
# Making sure .rela.plt has the right contents; no R_CRIS_NONE entries.
|
|
|
|
#...
|
|
.* .got[ ]+PROGBITS[ ]+0+22e4 0+2e4 0+20 04 WA 0 0 4
|
|
#...
|
|
Relocation section '\.rela\.dyn' at offset .* contains 2 entries:
|
|
Offset Info Type Sym\.Value Sym\. Name \+ Addend
|
|
000022f0 0000001e R_CRIS_DTPMOD +0
|
|
00002300 0000040a R_CRIS_GLOB_DAT 00002304 expobj \+ 0
|
|
|
|
Relocation section '\.rela\.plt' at offset .* contains 2 entries:
|
|
Offset Info Type Sym\.Value Sym\. Name \+ Addend
|
|
000022f8 0000020b R_CRIS_JUMP_SLOT 00000232 dsofn4 \+ 0
|
|
000022fc 0000080b R_CRIS_JUMP_SLOT 0000024a dsofn \+ 0
|
|
|
|
The decoding of unwind sections for machine type Axis Communications 32-bit embedded processor is not currently supported.
|
|
#pass
|