ARM: fiq_debugger: Add help command

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

diff --git a/arch/arm/common/fiq_debugger.c b/arch/arm/common/fiq_debugger.c
index a97c9b2c197acf4dd50d4ac4c4e672f132b91244..f172c15f1d3e958c4e375f604da1413ab0533b0a 100644 (file)
--- a/arch/arm/common/fiq_debugger.c
+++ b/arch/arm/common/fiq_debugger.c
@@ -447,10 +447,35 @@ void dump_stacktrace(struct fiq_debugger_state *state,
                tail = user_backtrace(state, tail);
 }
 
+static void debug_help(struct fiq_debugger_state *state)
+{
+       debug_printf(state,     "FIQ Debugger commands:\n"
+                               " pc            PC status\n"
+                               " regs          Register dump\n"
+                               " allregs       Extended Register dump\n"
+                               " bt            Stack trace\n"
+                               " reboot        Reboot\n"
+                               " irqs          Interupt status\n"
+                               " kmsg          Kernel log\n"
+                               " version       Kernel version\n");
+       debug_printf(state,     " sleep         Allow sleep while in FIQ\n"
+                               " nosleep       Disable sleep while in FIQ\n"
+                               " console       Switch terminal to console\n"
+                               " cpu           Current CPU\n"
+                               " cpu <number>  Switch to CPU<number>\n");
+       if (!state->debug_busy) {
+               strcpy(state->debug_cmd, "help");
+               state->debug_busy = 1;
+               debug_force_irq(state);
+       }
+}
+
 static void debug_exec(struct fiq_debugger_state *state,
                        const char *cmd, unsigned *regs, void *svc_sp)
 {
-       if (!strcmp(cmd, "pc")) {
+       if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) {
+               debug_help(state);
+       } else if (!strcmp(cmd, "pc")) {
                debug_printf(state, " pc %08x cpsr %08x mode %s\n",
                        regs[15], regs[16], mode_name(regs[16]));
        } else if (!strcmp(cmd, "regs")) {