7f03bd92e3
The ppc64 displaced step code can't handle atomic sequences. Fallback to stepping over the breakpoint in-line if we detect one. gdb/ChangeLog: 2015-08-07 Pedro Alves <palves@redhat.com> * infrun.c (displaced_step_prepare_throw): Return -1 if gdbarch_displaced_step_copy_insn returns NULL. Update intro comment. * rs6000-tdep.c (LWARX_MASK, LWARX_INSTRUCTION, LDARX_INSTRUCTION) (STWCX_MASK, STWCX_INSTRUCTION, STDCX_INSTRUCTION): Move higher up in file. (ppc_displaced_step_copy_insn): New function. (ppc_displaced_step_fixup): Update comment. (rs6000_gdbarch_init): Install ppc_displaced_step_copy_insn as gdbarch_displaced_step_copy_insn hook. * gdbarch.sh (displaced_step_copy_insn): Document what happens on NULL return. * gdbarch.h: Regenerate. gdb/testsuite/ChangeLog: 2015-08-07 Pedro Alves <palves@redhat.com> * gdb.arch/ppc64-atomic-inst.exp (do_test): New procedure, move tests here. (top level): Run do_test with and without displaced stepping.
72 lines
2.2 KiB
Text
72 lines
2.2 KiB
Text
# Copyright 2008-2015 Free Software Foundation, Inc.
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#
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# This file is part of the gdb testsuite.
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# Test single stepping through atomic sequences beginning with
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# a lwarx/ldarx instruction and ending with a stwcx/stdcx
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# instruction.
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if {![istarget "powerpc*"] || ![is_lp64_target]} {
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verbose "Skipping testing of powerpc64 single stepping over atomic sequences."
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return
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}
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standard_testfile .S
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if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug quiet}] } {
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return -1
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}
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# The test proper. DISPLACED is true if we should try with displaced
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# stepping.
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proc do_test { displaced } {
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global decimal hex
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if ![runto_main] then {
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untested "could not run to main"
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return -1
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}
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gdb_test_no_output "set displaced-stepping $displaced"
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set bp1 [gdb_get_line_number "lwarx"]
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gdb_breakpoint "$bp1" "Breakpoint $decimal at $hex" \
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"Set the breakpoint at the start of the lwarx/stwcx sequence"
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set bp2 [gdb_get_line_number "ldarx"]
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gdb_breakpoint "$bp2" "Breakpoint $decimal at $hex" \
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"Set the breakpoint at the start of the ldarx/stdcx sequence"
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gdb_test continue "Continuing.*Breakpoint $decimal.*" \
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"Continue until lwarx/stwcx start breakpoint"
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gdb_test nexti "bne.*1b" \
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"Step through the lwarx/stwcx sequence"
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gdb_test continue "Continuing.*Breakpoint $decimal.*" \
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"Continue until ldarx/stdcx start breakpoint"
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gdb_test nexti "bne.*1b" \
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"Step through the ldarx/stdcx sequence"
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}
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foreach displaced { "off" "on" } {
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with_test_prefix "displaced=$displaced" {
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do_test $displaced
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}
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}
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