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S390: Fix internal error with stackless inferior

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This fixes a GDB internal error that may occur when the inferior has no
valid stack pointer in r15.

gdb/testsuite/ChangeLog:

	* gdb.arch/s390-stackless.S: New.
	* gdb.arch/s390-stackless.exp: New.

gdb/ChangeLog:

	* s390-linux-tdep.c (s390_backchain_frame_unwind_cache): Avoid
	exception when attempting to access the inferior's backchain.
This commit is contained in:
Andreas Arnez 2016-03-01 12:43:55 +01:00
parent 020efce52a
commit f24894771e
5 changed files with 86 additions and 2 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2016-03-01 Andreas Arnez <arnez@linux.vnet.ibm.com>
* s390-linux-tdep.c (s390_backchain_frame_unwind_cache): Avoid
exception when attempting to access the inferior's backchain.
2016-02-29 Yao Qi <yao.qi@linaro.org>
* aarch64-linux-tdep.c (aarch64_canonicalize_syscall): Support

6
gdb/s390-linux-tdep.c
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@ -2180,7 +2180,7 @@ s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR backchain;
ULONGEST reg;
LONGEST sp;
LONGEST sp, tmp;
int i;
/* Set up ABI call-saved/call-clobbered registers. */
@ -2193,7 +2193,9 @@ s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
/* Get the backchain. */
reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
if (!safe_read_memory_integer (reg, word_size, byte_order, &tmp))
tmp = 0;
backchain = (CORE_ADDR) tmp;
/* A zero backchain terminates the frame chain. As additional
sanity check, let's verify that the spill slot for SP in the

5
gdb/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-03-01 Andreas Arnez <arnez@linux.vnet.ibm.com>
* gdb.arch/s390-stackless.S: New.
* gdb.arch/s390-stackless.exp: New.
2016-02-28 Iain Buclaw <ibuclaw@gdcproject.org>
* gdb.dlang/circular.c: New file.

33
gdb/testsuite/gdb.arch/s390-stackless.S Normal file
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@ -0,0 +1,33 @@
/* Copyright 2015-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
.text
.align 8
.globl main
.type main, @function
/* Ensure an invalid stack pointer and link register. Don't
use zero, since that may be handled specially. */
main: la %r15,3(0,0)
la %r14,1(0,0)
j 1f
.size main, .-main
/* Outside any function. */
.byte 0,1
1: st %r15,0(%r15)
br %r14

39
gdb/testsuite/gdb.arch/s390-stackless.exp Normal file
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@ -0,0 +1,39 @@
# Copyright 2016 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
if {![istarget "s390*-*-*"]} then {
verbose "Skipping s390 stackless test."
return
}
standard_testfile .S
if { [prepare_for_testing $testfile.exp $testfile $srcfile] } {
return -1
}
# Run until SIGSEGV.
gdb_run_cmd
set test "run until SIGSEGV"
gdb_test_multiple "" $test {
-re "Program received signal SIGSEGV.*$gdb_prompt $" {
pass $test
}
}
# Ensure that 'info registers' works properly and does not generate
# an internal-error.
gdb_test "info registers" "r0.*" "info registers"