diff options
| author | Pedro Alves <palves@redhat.com> | 2016-03-15 16:33:04 +0000 |
|---|---|---|
| committer | Pedro Alves <palves@redhat.com> | 2016-03-15 16:33:04 +0000 |
| commit | 16b4184277c4ad5b4a20278060fd3f6259d1ed49 (patch) | |
| tree | 7dabff235810866e3eaaa237b899bb0f2cc33c27 /gdb/linux-tdep.c | |
| parent | 2a60e18f8fe3bf9512671e02b39acacb484bb8c6 (diff) | |
| download | gdb-16b4184277c4ad5b4a20278060fd3f6259d1ed49.zip gdb-16b4184277c4ad5b4a20278060fd3f6259d1ed49.tar.gz gdb-16b4184277c4ad5b4a20278060fd3f6259d1ed49.tar.bz2 | |
Fix PR gdb/19676: Disable displaced stepping if /proc not mounted
On GNU/Linux archs that support displaced stepping, if /proc is not
mounted, GDB gets stuck not able to step past breakpoints:
(gdb) c
Continuing.
dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
2163 LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
Cannot find AT_ENTRY auxiliary vector entry.
(gdb) c
Continuing.
dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
2163 LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
Cannot find AT_ENTRY auxiliary vector entry.
(gdb)
That's because GDB can't figure out where the scratch pad is.
This is a regression introduced by the earlier changes to make the
Linux native target always work in non-stop mode.
This commit makes GDB detect the case and fallback to stepping over
breakpoints in-line.
gdb/ChangeLog:
2016-03-15 Pedro Alves <palves@redhat.com>
PR gdb/19676
* infrun.c (displaced_step_prepare): Also disable displaced
stepping on NOT_SUPPORTED_ERROR.
* linux-tdep.c (linux_displaced_step_location): If reading auxv
fails, throw NOT_SUPPORTED_ERROR instead of generic error.
Diffstat (limited to 'gdb/linux-tdep.c')
| -rw-r--r-- | gdb/linux-tdep.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c index 555c302..f197aa7 100644 --- a/gdb/linux-tdep.c +++ b/gdb/linux-tdep.c @@ -2426,7 +2426,8 @@ linux_displaced_step_location (struct gdbarch *gdbarch) location. The auxiliary vector gets us the PowerPC-side entry point address instead. */ if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0) - error (_("Cannot find AT_ENTRY auxiliary vector entry.")); + throw_error (NOT_SUPPORTED_ERROR, + _("Cannot find AT_ENTRY auxiliary vector entry.")); /* Make certain that the address points at real code, and not a function descriptor. */ |