------- Comment From emach...@br.ibm.com 2014-10-20 13:05 EDT------- Tested and verified as fixed with gdb 7.8-1ubuntu4. Thanks.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gdb in Ubuntu. https://bugs.launchpad.net/bugs/1367832 Title: gdbserver gets conditionals wrong on ppc64le Status in “gdb” package in Ubuntu: Fix Released Bug description: ---Problem Description--- Single stepping has issues with conditionals when debugging with gdbserver, taking the wrong path through the code. Machine Type = Power8 LE ---Steps to Reproduce--- ubuntu@ubuntu:~$ cat > test.c #include <stdio.h> #include <stdlib.h> typedef enum { Success = 0, Failure, } dev_status_t; dev_status_t getDeviceCount(int *countp) { *countp = 1; return Success; } int main(int argc, char **argv) { int count = 0; dev_status_t status = getDeviceCount(&count); if (status != Success) { printf("getDeviceCount returned %d\n", (int)status); printf("Result = FAIL\n"); exit(EXIT_FAILURE); } if (count == 0) { printf("There are no devices\n"); } else { printf("Detected %d device(s)\n", count); } exit(EXIT_SUCCESS); } ubuntu@ubuntu:~$ gcc -g test.c -o test ubuntu@ubuntu:~$ gdbserver :9999 ./test Process ./test created; pid = 25600 Listening on port 9999 Remote debugging from host 127.0.0.1 In another terminal, run gdb: ubuntu@ubuntu:~$ gdb ./test GNU gdb (Ubuntu 7.8-0ubuntu1) 7.8 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64le-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./test...done. (gdb) target remote :9999 Remote debugging using :9999 Reading symbols from /lib64/ld64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld64.so.2 Can't read symbols from system-supplied DSO at 0x3fffb7fa0000: File truncated 0x00003fffb7fc1a60 in ?? () from /lib64/ld64.so.2 (gdb) b main Breakpoint 1 at 0x100006d4: file test.c, line 17. (gdb) cont Continuing. Breakpoint 1, main (argc=1, argv=0x3ffffffff088) at test.c:17 17 { (gdb) next 18 int count = 0; (gdb) next 19 dev_status_t status = getDeviceCount(&count); (gdb) next 21 if (status != Success) (gdb) next 23 printf("getDeviceCount returned %d\n", (int)status); (gdb) print status $1 = Success Notice the program took the wrong direction on if() block. ---uname output--- Linux ubuntu 3.16.0-14-generic #20-Ubuntu SMP Sat Sep 6 23:45:12 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux Userspace tool common name: gdbserver The root cause of this issue was a routine that collect/supply ptrace registers on gdbserver, originally developed for BE only. The attached patch against gdb 7.8-0ubuntu1 sources fixes this problem on gdbserver. It was already accepted and committed upstream: https://sourceware.org/ml/gdb-patches/2014-09/msg00181.html To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1367832/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
