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gdbstub: don't fail on vCont; C04:0; c packets

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The thread-id of 0 means any CPU but we then ignore the fact we find
the first_cpu in this case who can have an index of 0. Instead of
bailing out just test if we have managed to match up thread-id to a
CPU.

Otherwise you get:
  gdb_handle_packet: command='vCont;C04:0;c'
  put_packet: reply='E22'

The actual reason for gdb sending vCont;C04:0;c was fixed in a
previous commit where we ensure the first_cpu's tid is correctly
reported to gdb however we should still behave correctly next time it
does send 0.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Message-Id: <20170712105216.747-5-alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Bennée 2017-07-12 11:52:16 +01:00 committed by Paolo Bonzini
parent bd88c780e6
commit 5a6a1ad181
1 changed files with 5 additions and 12 deletions
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17
gdbstub.c
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@ -938,23 +938,16 @@ static int gdb_handle_vcont(GDBState *s, const char *p)
if (res) {
goto out;
}
idx = tmp;
/* 0 means any thread, so we pick the first valid CPU */
if (!idx) {
idx = cpu_gdb_index(first_cpu);
}
/*
* If we are in user mode, the thread specified is actually a
* thread id, and not an index. We need to find the actual
* CPU first, and only then we can use its index.
*/
cpu = find_cpu(idx);
/* 0 means any thread, so we pick the first valid CPU */
cpu = tmp ? find_cpu(tmp) : first_cpu;
/* invalid CPU/thread specified */
if (!idx || !cpu) {
if (!cpu) {
res = -EINVAL;
goto out;
}
/* only use if no previous match occourred */
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;