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gdbstub/linux-user: support debugging over a unix socket

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While debugging over TCP is fairly straightforward now we have test
cases that want to orchestrate via make and currently a parallel build
fails as two processes can't use the same listening port. While system
emulation offers a wide cornucopia of connection methods thanks to the
chardev abstraction we are a little more limited for linux user.
Thankfully the programming API for a TCP socket and a local UNIX
socket is pretty much the same once it's set up.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200430190122.4592-7-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2020-04-30 20:01:19 +01:00
parent e0a1e20847
commit fcedd92086
4 changed files with 106 additions and 31 deletions
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12
linux-user/main.c
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@ -51,7 +51,7 @@ char *exec_path;
int singlestep;
static const char *argv0;
static int gdbstub_port;
static const char *gdbstub;
static envlist_t *envlist;
static const char *cpu_model;
static const char *cpu_type;
@ -310,7 +310,7 @@ static void handle_arg_seed(const char *arg)
static void handle_arg_gdb(const char *arg)
{
gdbstub_port = atoi(arg);
gdbstub = g_strdup(arg);
}
static void handle_arg_uname(const char *arg)
@ -861,10 +861,10 @@ int main(int argc, char **argv, char **envp)
target_cpu_copy_regs(env, regs);
if (gdbstub_port) {
if (gdbserver_start(gdbstub_port) < 0) {
fprintf(stderr, "qemu: could not open gdbserver on port %d\n",
gdbstub_port);
if (gdbstub) {
if (gdbserver_start(gdbstub) < 0) {
fprintf(stderr, "qemu: could not open gdbserver on %s\n",
gdbstub);
exit(EXIT_FAILURE);
}
gdb_handlesig(cpu, 0);