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| author | Alan Modra <amodra@gmail.com> | 2014-01-30 08:26:02 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2014-02-03 20:24:20 +1030 |
| commit | 5446cbdf82892a800ed7eef563a795e75223ec52 (patch) | |
| tree | 5abcadcfcfd715515d8c13b7905a03626004ef2c /bfd/section.c | |
| parent | 8effdc96dc110ef0bcd256bdc026d56d373c2e11 (diff) | |
| download | gdb-5446cbdf82892a800ed7eef563a795e75223ec52.zip gdb-5446cbdf82892a800ed7eef563a795e75223ec52.tar.gz gdb-5446cbdf82892a800ed7eef563a795e75223ec52.tar.bz2 | |
ppc476 icache bug workaround
This implements a work-around for an icache bug on 476 that can cause
execution of stale instructions when control falls through from one
page to the next. The idea is to prevent such fall-through by
replacing the last instruction on a page with a branch to a patch
area containing the instruction, then branch to the next page.
The patch also fixes a number of bugs in the existing support for long
branch trampolines.
bfd/
* elf32-ppc.c (struct ppc_elf_link_hash_table): Add params.
Delete emit_stub_syms, no_tls_get_addr_opt. Update all uses.
(ppc_elf_link_params): New function.
(ppc_elf_create_glink): Align .glink to 64 bytes for ppc476
workaround.
(ppc_elf_select_plt_layout): Remove plt_style and emit_stub_syms
parameters. Use htab->params instead.
(ppc_elf_tls_setup): Remove no_tls_get_addr_opt parameter.
(ppc_elf_size_dynamic_sections): Align __glink_PLTresolve to
64 bytes for ppc476 workaround.
(struct ppc_elf_relax_info): New.
(ppc_elf_relax_section): Exclude linker created sections and
those too small to hold one instruction. Don't add another
branch around trampolines on later relax passes. Don't
generate trampolines for undefined symbols when !relocatable,
nor for plugin symbols. Allocate space for ppc476 workaround
patch area. Free fixups on error return path.
(ppc_elf_relocate_section): Handle ppc476 workaround patching.
* elf32-ppc.h (struct ppc_elf_params): New.
(ppc_elf_select_plt_layout, ppc_elf_tls_setup): Update prototype.
(ppc_elf_link_params): Declare.
* section.c (SEC_INFO_TYPE_TARGET): Define.
* bfd-in2.h: Regenerate.
ld/
* emultempl/ppc32elf.em (no_tls_get_addr_opt, emit_stub_syms)
plt_style): Delete. Adjust all refs to instead use..
(params): ..this. New variable.
(ppc_after_open_output): New function. Tweak params and pass to
ppc_elf_link_params.
(ppc_after_open): Adjust ppc_elf_select_plt_layout call.
(ppc_before_allocation): Adjust ppc_elf_tls_setup call. Enable
relaxation for ppc476 workaround.
(PARSE_AND_LIST_*): Add --{no-,}ppc476-workaround support.
(LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): Define.
Diffstat (limited to 'bfd/section.c')
| -rw-r--r-- | bfd/section.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/bfd/section.c b/bfd/section.c index a661228..d21df1c 100644 --- a/bfd/section.c +++ b/bfd/section.c @@ -388,6 +388,7 @@ CODE_FRAGMENT .#define SEC_INFO_TYPE_MERGE 2 .#define SEC_INFO_TYPE_EH_FRAME 3 .#define SEC_INFO_TYPE_JUST_SYMS 4 +.#define SEC_INFO_TYPE_TARGET 5 . . {* Nonzero if this section uses RELA relocations, rather than REL. *} . unsigned int use_rela_p:1; |