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gdbstub: add multiprocess support to 'D' packets 

'D' packets are used by GDB to detach from a process. In multiprocess
mode, the PID to detach from is sent in the request.

Signed-off-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20181207090135.7651-11-luc.michel@greensocs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Luc Michel 2019-01-07 15:23:46 +00:00 committed by Peter Maydell
parent 95567c2712
commit 546f3c676c
1 changed files with 53 additions and 7 deletions
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60
gdbstub.c
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@ -1047,6 +1047,24 @@ static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
}
}
static inline void gdb_cpu_breakpoint_remove_all(CPUState *cpu)
{
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
}
static void gdb_process_breakpoint_remove_all(const GDBState *s, GDBProcess *p)
{
CPUState *cpu = get_first_cpu_in_process(s, p);
while (cpu) {
gdb_cpu_breakpoint_remove_all(cpu);
cpu = gdb_next_cpu_in_process(s, cpu);
}
}
static void gdb_breakpoint_remove_all(void)
{
CPUState *cpu;
@ -1057,10 +1075,7 @@ static void gdb_breakpoint_remove_all(void)
}
CPU_FOREACH(cpu) {
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
gdb_cpu_breakpoint_remove_all(cpu);
}
}
@ -1339,9 +1354,40 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
exit(0);
case 'D':
/* Detach packet */
gdb_breakpoint_remove_all();
gdb_syscall_mode = GDB_SYS_DISABLED;
gdb_continue(s);
pid = 1;
if (s->multiprocess) {
unsigned long lpid;
if (*p != ';') {
put_packet(s, "E22");
break;
}
if (qemu_strtoul(p + 1, &p, 16, &lpid)) {
put_packet(s, "E22");
break;
}
pid = lpid;
}
process = gdb_get_process(s, pid);
gdb_process_breakpoint_remove_all(s, process);
process->attached = false;
if (pid == gdb_get_cpu_pid(s, s->c_cpu)) {
s->c_cpu = gdb_first_attached_cpu(s);
}
if (pid == gdb_get_cpu_pid(s, s->g_cpu)) {
s->g_cpu = gdb_first_attached_cpu(s);
}
if (s->c_cpu == NULL) {
/* No more process attached */
gdb_syscall_mode = GDB_SYS_DISABLED;
gdb_continue(s);
}
put_packet(s, "OK");
break;
case 's':