4a7e075c3f
I see the following test fail in arm-linux with -marm and -fomit-frame-pointer, step callee () at /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/step-reverse.c:27 27 } /* RETURN FROM CALLEE */ (gdb) step main () at /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/step-reverse.c:58 58 callee(); /* STEP INTO THIS CALL */ (gdb) FAIL: gdb.reverse/step-precsave.exp: reverse step into fn call As we can see, the "step" has already stepped into the function callee, but in the last line. The second "step" attempts to step to function body, but it goes out of callee, which isn't expected. The program is compiled with -marm and -fomit-frame-pointer, the function callee is prologue-less, because nothing needs to be saved on stack, (gdb) disassemble callee Dump of assembler code for function callee: 0x00010680 <+0>: movw r3, #2364 ; 0x93c 0x00010684 <+4>: movt r3, #2 0x00010688 <+8>: ldr r3, [r3] 0x0001068c <+12>: add r2, r3, #1 0x00010690 <+16>: movw r3, #2364 ; 0x93c 0x00010694 <+20>: movt r3, #2 0x00010698 <+24>: str r2, [r3] 0x0001069c <+28>: mov r3, #0 0x000106a0 <+32>: mov r0, r3 0x000106a4 <+36>: bx lr program stops at the 0x106a0 (passed the epilogue) after the first "step". When second "step" is executed, the stepping range is [0x10680-0x106a0], which starts from the first instruction of function callee (because it doesn't have prologue). infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=0, current thread [LWP 2461] at 0x1069c^M infrun: prepare_to_wait^M infrun: target_wait (-1.0.0, status) =^M infrun: 2461.2461.0 [LWP 2461],^M infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP^M infrun: TARGET_WAITKIND_STOPPED^M infrun: stop_pc = 0x10698^M infrun: stepping inside range [0x10680-0x106a0] When program goes out of the range, it stops at the caller of callee, and test fails. IOW, if function callee has prologue, the stepping range won't start from the first instruction of the function, and program stops at the prologue and test passes. IMO, GDB does nothing wrong, but test shouldn't expect the program stops in callee after the second "step". I decide to fix test rather than GDB. In this patch, I change to test to do one "step", and check the program is still in callee, then, do multiple "step" until program goes out of the callee. gdb/testsuite: 2016-04-22 Yao Qi <yao.qi@linaro.org> * gdb.reverse/step-precsave.exp: Do one step and test program stops in "callee" and do multiple steps until program goes out of "callee". * gdb.reverse/step-reverse.exp: Likewise. |
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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.