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823b2395e4
On s390x-linux with target board unix/-m31, I run into:
...
(gdb) PASS: gdb.guile/scm-lazy-string.exp: bad length
print ptr^M
$1 = 0x804006b0 <error: Cannot access memory at address 0x804006b0>^M
(gdb) FAIL: gdb.guile/scm-lazy-string.exp: ptr: print ptr
...
A minimal example is:
...
$ gdb -q -batch -ex "set trace-commands on" -x gdb.in
+file scm-lazy-string
+break main
Breakpoint 1 at 0x4005d2: file scm-lazy-string.c, line 23.
+run
Breakpoint 1, main () at scm-lazy-string.c:23
23 const char *ptr = "pointer";
+step
24 const char array[] = "array";
+print ptr
$1 = 0x804006b0 <error: Cannot access memory at address 0x804006b0>
...
If we delete the breakpoint after running to it, we have instead the expected:
...
+delete
+step
24 const char array[] = "array";
+print ptr
$1 = 0x4006b0 "pointer"
...
The problem is in displaced stepping, forced by the presence of the breakpoint,
when stepping over this insn:
...
0x4005d2 <main+10> larl %r1,0x4006b0
...
With normal stepping we have:
...
(gdb) p /x $r1
$2 = 0x3ff004006b0
...
but with displaced stepping we have instead (note the 0x80000000 difference):
...
(gdb) p /x $r1
$1 = 0x3ff804006b0
(gdb)
...
The difference comes from this code in s390_displaced_step_fixup:
...
/* Handle LOAD ADDRESS RELATIVE LONG. */
else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
{
/* Update PC. */
regcache_write_pc (regs, from + insnlen);
/* Recompute output address in R1. */
regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
amode | (from + i2 * 2));
}
...
where the "amode |" adds the 0x80000000.
Fix this by removing the "amode |".
Tested on s390-linux, with native and target board unix/-m31.
Approved-By: Ulrich Weigand <uweigand@de.ibm.com>
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| bfd | ||
| binutils | ||
| config | ||
| contrib | ||
| cpu | ||
| elfcpp | ||
| etc | ||
| gas | ||
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| gnulib | ||
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| include | ||
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| libdecnumber | ||
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| zlib | ||
| .cvsignore | ||
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| ar-lib | ||
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| compile | ||
| config-ml.in | ||
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| config.rpath | ||
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| COPYING | ||
| COPYING3 | ||
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| depcomp | ||
| djunpack.bat | ||
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.