aboutsummaryrefslogtreecommitdiff
path: root/gold
diff options
context:
space:
mode:
authorAlan Modra <amodra@gmail.com>2014-06-03 10:55:29 +0930
committerAlan Modra <amodra@gmail.com>2014-06-03 10:55:29 +0930
commit397998fc32a34d3c8993ef46da45c3957a4dd402 (patch)
tree2dba3305c8567097b13505879d970299d2b9ad08 /gold
parent61f5c66f62502f33e1f2441a043bd29bb3ad6ea5 (diff)
downloadgdb-397998fc32a34d3c8993ef46da45c3957a4dd402.zip
gdb-397998fc32a34d3c8993ef46da45c3957a4dd402.tar.gz
gdb-397998fc32a34d3c8993ef46da45c3957a4dd402.tar.bz2
Support fusion for ELFv2 stubs
Power8 fuses addis,addi and addis,ld sequences when the target of the addis is the same as the addi/ld. Thus addis r12,r2,xxx@ha addi r12,r12,xxx@l / ld r12,xxx@l(r12) is faster than addis r11,r2,xxx@ha addi r12,r11,xxx@l / ld r12,xxx@l(r11) So use the form that allows fusion in plt call and branch stubs. bfd/ * elf64-ppc.c (ADDIS_R12_R2): Define. (build_plt_stub): Support fusion on ELFv2 stub. (ppc_build_one_stub): Likewise for plt branch stubs. gold/ * powerpc.cc (addis_12_2): Define. (Stub_table::do_write): Support fusion on ELFv2 stubs. ld/testsuite/ * ld-powerpc/elfv2exe.d: Update for changed plt call stubs. gdb/ * ppc64-tdep.c (ppc64_standard_linkage8): New. (ppc64_skip_trampoline_code): Recognise ELFv2 stub supporting fusion.
Diffstat (limited to 'gold')
-rw-r--r--gold/ChangeLog5
-rw-r--r--gold/powerpc.cc23
2 files changed, 22 insertions, 6 deletions
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 0bde6a1..5e15f5e 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,5 +1,10 @@
2014-06-03 Alan Modra <amodra@gmail.com>
+ * powerpc.cc (addis_12_2): Define.
+ (Stub_table::do_write): Support fusion on ELFv2 stubs.
+
+2014-06-03 Alan Modra <amodra@gmail.com>
+
* testsuite/plugin_test.c (parse_readelf_line): Skip non-visibility
st_other output.
diff --git a/gold/powerpc.cc b/gold/powerpc.cc
index 1078017..bd3994a 100644
--- a/gold/powerpc.cc
+++ b/gold/powerpc.cc
@@ -3077,6 +3077,7 @@ static const uint32_t addis_3_13 = 0x3c6d0000;
static const uint32_t addis_11_2 = 0x3d620000;
static const uint32_t addis_11_11 = 0x3d6b0000;
static const uint32_t addis_11_30 = 0x3d7e0000;
+static const uint32_t addis_12_2 = 0x3d820000;
static const uint32_t addis_12_12 = 0x3d8c0000;
static const uint32_t b = 0x48000000;
static const uint32_t bcl_20_31 = 0x429f0005;
@@ -4210,10 +4211,20 @@ Stub_table<size, big_endian>::do_write(Output_file* of)
{
write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc());
p += 4;
- write_insn<big_endian>(p, addis_11_2 + ha(off));
- p += 4;
- write_insn<big_endian>(p, ld_12_11 + l(off));
- p += 4;
+ if (plt_load_toc)
+ {
+ write_insn<big_endian>(p, addis_11_2 + ha(off));
+ p += 4;
+ write_insn<big_endian>(p, ld_12_11 + l(off));
+ p += 4;
+ }
+ else
+ {
+ write_insn<big_endian>(p, addis_12_2 + ha(off));
+ p += 4;
+ write_insn<big_endian>(p, ld_12_12 + l(off));
+ p += 4;
+ }
if (plt_load_toc
&& ha(off + 8 + 8 * static_chain) != ha(off))
{
@@ -4312,8 +4323,8 @@ Stub_table<size, big_endian>::do_write(Output_file* of)
}
else
{
- write_insn<big_endian>(p, addis_11_2 + ha(brltoff)), p += 4;
- write_insn<big_endian>(p, ld_12_11 + l(brltoff)), p += 4;
+ write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4;
+ write_insn<big_endian>(p, ld_12_12 + l(brltoff)), p += 4;
}
write_insn<big_endian>(p, mtctr_12), p += 4;
write_insn<big_endian>(p, bctr);