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The powerpc64le-linux ABI specifies that when a 128-bit DFP value is passed in a pair of floating-point registers, the first register holds the most-significant part of the value. This is as opposed to the usual rule on little-endian systems, where the first register would hold the least-significant part. This affects two places in GDB, the read/write routines for the 128-bit DFP pseudo-registers, and the function call / return sequence. For the former, current code already distinguishes between big- and little-endian targets, but gets the latter wrong. This is presumably because *GCC* also got it wrong, and GDB matches the old GCC behavior. But GCC is now fixed: http://gcc.gnu.org/ml/gcc-patches/2013-11/msg02145.html so GDB needs to be fixed too. (Old code shouldn't really be an issue since there is no code "out there" so far that uses dfp128 on little-endian ...) gdb/ChangeLog: * ppc-sysv-tdep.c (ppc64_sysv_abi_push_freg): Use correct order within a register pair holding a DFP 128-bit value on little-endian. (ppc64_sysv_abi_return_value_base): Likewise. * rs6000-tdep.c (dfp_pseudo_register_read): Likewise. (dfp_pseudo_register_write): Likewise. gdb/testsuite/ChangeLog: * gdb.arch/powerpc-d128-regs.exp: Enable on powerpc64*-*.
73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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# Copyright 2008-2014 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Please email any bugs, comments, and/or additions to this file to:
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# bug-gdb@gnu.org
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# Testcase for ppc decimal128 pseudo-registers.
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if ![istarget "powerpc64*-*"] then {
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verbose "Skipping powerpc Decimal128 pseudo-registers testcase."
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return
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}
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set testfile "powerpc-d128-regs"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {quiet debug}] != "" } {
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untested powerpc-d128-regs.exp
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return -1
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}
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# Start with a fresh gdb.
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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if { ![runto main] } then {
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fail "run to main"
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return
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}
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if [gdb_test "show arch" ".*currently powerpc:common.*" "Checking for PPC arch"] {
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return -1
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}
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gdb_test "next" ""
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for {set i 0} {$i < 16} {incr i 1} {
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gdb_test "set \$dl$i=d128" "" "Set dl$i register"
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gdb_test "print \$dl$i" "\\\$$decimal = 1\.2345678910" "Print dl$i register as DFP"
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gdb_test "info reg dl$i" \
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"dl$i\[ \]*1\.2345678910\[\t\]*\\(raw 0x2205800000000000000000049c5de09c\\)" \
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"Print dl$i register with the info reg command"
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gdb_test "info reg f[expr 2*$i]" \
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"f[expr 2*$i]\[ \]*8\.608957309287334e\-145\[\t\]*\\(raw 0x2205800000000000\\)" \
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"Testing lower half of dl$i register"
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gdb_test "info reg f[expr 2*$i+1]" \
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"f[expr 2*$i+1]\[ \]*9\.7841140127686122e\-314\[\t\]*\\(raw 0x000000049c5de09c\\)" \
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"Testing upper half of dl$i register"
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}
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