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Disabling hardware single step in gdbserver

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This patch gives gdbserver the ability to omit the 's' reply to
'vCont?'.  This tells gdb that hardware single-step is definitely not
supported, causing it to fall back to using software single-step.
This is useful for testing the earlier change to
maybe_software_singlestep.

Approved-By: Andrew Burgess <aburgess@redhat.com>
This commit is contained in:
Tom Tromey
2023-06-07 09:32:46 -06:00
parent 14de1447c9
commit 1b34c1e50d
2 changed files with 9 additions and 4 deletions
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12
gdbserver/server.cc
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@@ -143,6 +143,7 @@ unsigned long signal_pid;
in gdbserver, for the sake of testing GDB against stubs that don't
support them. */
bool disable_packet_vCont;
bool disable_packet_vCont_step;
bool disable_packet_Tthread;
bool disable_packet_qC;
bool disable_packet_qfThreadInfo;
@@ -3538,9 +3539,10 @@ handle_v_requests (char *own_buf, int packet_len, int *new_packet_len)
{
strcpy (own_buf, "vCont;c;C;t");
if (target_supports_hardware_single_step ()
|| target_supports_software_single_step ()
|| !cs.vCont_supported)
if (!disable_packet_vCont_step
&& (target_supports_hardware_single_step ()
|| target_supports_software_single_step ()
|| !cs.vCont_supported))
{
/* If target supports single step either by hardware or by
software, add actions s and S to the list of supported
@@ -3873,7 +3875,7 @@ gdbserver_usage (FILE *stream)
" --disable-packet=OPT1[,OPT2,...]\n"
" Disable support for RSP packets or features.\n"
" Options:\n"
" vCont, T, Tthread, qC, qfThreadInfo and \n"
" vCont, vConts, T, Tthread, qC, qfThreadInfo and\n"
" threads (disable all threading packets).\n"
"\n"
"For more information, consult the GDB manual (available as on-line \n"
@@ -4293,6 +4295,8 @@ captured_main (int argc, char *argv[])
{
if (strcmp ("vCont", tok) == 0)
disable_packet_vCont = true;
else if (strcmp ("vConts", tok) == 0)
disable_packet_vCont_step = true;
else if (strcmp ("Tthread", tok) == 0)
disable_packet_Tthread = true;
else if (strcmp ("qC", tok) == 0)