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This addresses PR gdb/27525. The lnia and other variations
of the addpcis instruction write the value of the NIA into a target register.
If we are single-stepping across a breakpoint, the instruction is executed
from a displaced location, and thusly the written value of the PC/NIA
will be incorrect. The changes here will measure the displacement
offset, and adjust the target register value to compensate.
YYYY-MM-DD Will Schmidt <will_schmidt@vnet.ibm.com>
gdb/ChangeLog:
* rs6000-tdep.c (ppc_displaced_step_fixup): Update to handle
the addpcis/lnia instruction.
gdb/testsuite/ChangeLog:
* gdb.arch/powerpc-addpcis.exp: Testcase harness to
exercise single-stepping over subpcis,lnia,addpcis instructions
with displacement.
* gdb.arch/powerpc-addpcis.s: Testcase with stream
of addpcis/lnia/subpcis instructions.
* gdb.arch/powerpc-lnia.exp: Testcase harness to exercise
single-stepping over lnia instructions with displacement.
* gdb.arch/powerpc-lnia.s: Testcase with stream of
lnia instructions.
36 lines
1.2 KiB
ArmAsm
36 lines
1.2 KiB
ArmAsm
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2021 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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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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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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/* Test to confirm that gdb is properly single stepping over the
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displaced addpcis instruction. */
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.global main
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.type main,function
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# addpcis: the sum of NIA + ( D || 0x0000) is placed in RT.
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main:
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subpcis 3,+0x100 # /* set r3 */
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subpcis 4,+0x10 # /* set r4 */
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subpcis 5,+0x1 # /* set r5 */
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lnia 6 # /* set r6 */
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addpcis 7,+0x1 # /* set r7 */
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addpcis 8,+0x10 # /* set r8 */
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addpcis 9,+0x100 # /* set r9 */
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blr
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