hwstub: implement EXEC command over net

Apparently I completely forgot to implement it so using hwstub over net would
just fail all EXEC commands :-s

Change-Id: I0d0506cbbce9b86c9a4f19036dacc922d1e51338

utils/hwstub/include/hwstub_protocol.h

@@ -315,4 +315,11 @@ struct hwstub_exec_req_t
  * Receive: no data
  */
 
+/**
+ * HWSERVER_EXEC:
+ * Execute code.
+ * Send: args[0] = handle ID, args[1] = addr, args[2] = flags, no data
+ * Receive: no data
+ */
+
 #endif /* __HWSTUB_PROTOCOL__ */

utils/hwstub/lib/hwstub_net.cpp

@@ -714,9 +714,25 @@ error handle::get_dev_log(void *buf, size_t& buf_sz)
 
 error handle::exec_dev(uint32_t addr, uint16_t flags)
 {
-    (void) addr;
+    std::shared_ptr<hwstub::context> hctx = get_device()->get_context();
-    (void) flags;
+    if(!hctx)
-    return error::DUMMY;
+        return error::NO_CONTEXT;
+
+    context *ctx = dynamic_cast<context*>(hctx.get());
+    ctx->debug() << "[net::handle] --> EXEC(" << m_handle_id << ",0x" << std::hex
+        << addr << ", 0x" << std::hex << flags << ")\n";
+    uint32_t args[HWSTUB_NET_ARGS] = {0};
+    args[0] = m_handle_id;
+    args[1] = addr;
+    args[2] = flags;
+    error err = ctx->send_cmd(HWSERVER_EXEC, args, nullptr, 0, nullptr, nullptr);
+    if(err != error::SUCCESS)
+    {
+        ctx->debug() << "[net::handle] <-- EXEC failed: " << error_string(err) << "\n";
+        return err;
+    }
+    ctx->debug() << "[net::handle] <-- EXEC\n";
+    return error::SUCCESS;
 }
 
 error handle::status() const
@@ -1200,6 +1216,33 @@ error server::handle_cmd(client_state *state, uint32_t cmd, uint32_t args[HWSTUB
         debug() << "[net::srv::cmd] <-- WRITE\n";
         return error::SUCCESS;
     }
+    /* HWSERVER_EXEC */
+    else if(cmd == HWSERVER_EXEC)
+    {
+        uint32_t hid = args[0];
+        uint32_t addr = args[1];
+        uint32_t flags = args[2];
+        debug() << "[net::srv::cmd] --> EXEC(" << hid << ",0x" << std::hex << addr << ","
+            << "0x" << std::hex << flags << ")\n";
+        /* check ID is valid */
+        auto it = state->handle_map.find(hid);
+        if(it == state->handle_map.end())
+        {
+            debug() << "[net::srv::cmd] unknown handle ID\n";
+            debug() << "[net::srv::cmd] <-- EXEC (error)\n";
+            return error::ERROR;
+        }
+        /* exec */
+        error err = it->second->exec(addr, flags);
+        if(err != error::SUCCESS)
+        {
+            debug() << "[net::srv::cmd] cannot write: " << error_string(err) << "\n";
+            debug() << "[net::srv::cmd] <-- EXEC (error)\n";
+            return err;
+        }
+        debug() << "[net::srv::cmd] <-- EXEC\n";
+        return error::SUCCESS;
+    }
     else
     {
         debug() << "[net::srv::cmd] <-> unknown cmd (0x" << std::hex << cmd << ")\n";

utils/hwstub/tools/hwstub_load.cpp

@@ -113,6 +113,8 @@ void usage(void)
     printf("  --type/-t <t>   Override file type\n");
     printf("  --dev/-d <uri>  Device URI (see below)\n");
     printf("  --verbose/-v    Display debug output\n");
+    printf("  --noload        Skip loading stage and only execute the given address\n");
+    printf("  --noexec        Skip execute stage and only load data the given address\n");
     printf("file types:\n");
     printf("  raw      Load a raw binary blob\n");
     printf("  rockbox  Load a rockbox image produced by scramble\n");
@@ -129,8 +131,9 @@ int main(int argc, char **argv)
 {
     bool quiet = false;
     enum image_type_t type = IT_DETECT;
-    const char *uri = "usb:";
     bool verbose = false;
+    const char *uri = hwstub::uri::default_uri().full_uri().c_str();
+    bool no_load = false, no_exec = false;
 
     // parse command line
     while(1)
@@ -142,10 +145,12 @@ int main(int argc, char **argv)
             {"type", required_argument, 0, 't'},
             {"dev", required_argument, 0, 'd'},
             {"verbose", no_argument, 0, 'v'},
+            {"noload", no_argument, 0, 'e'},
+            {"noexec", no_argument, 0, 'l'},
             {0, 0, 0, 0}
         };
 
-        int c = getopt_long(argc, argv, "?qt:d:v", long_options, NULL);
+        int c = getopt_long(argc, argv, "?qt:d:elv", long_options, NULL);
         if(c == -1)
             break;
         switch(c)
@@ -176,6 +181,11 @@ int main(int argc, char **argv)
                 break;
             case 'v':
                 verbose = true;
+            case 'e':
+                no_load = true;
+                break;
+            case 'l':
+                no_exec = true;
                 break;
             default:
                 abort();
@@ -266,6 +276,9 @@ int main(int argc, char **argv)
         return 1;
     }
 
+    /* load */
+    if(!no_load)
+    {
         size_t out_size = size;
         ret = hwdev->write(addr, buffer, out_size, false);
         if(ret != hwstub::error::SUCCESS || out_size != size)
@@ -274,7 +287,22 @@ int main(int argc, char **argv)
                 out_size, size);
             goto Lerr;
         }
-    hwdev->exec(addr, HWSTUB_EXEC_JUMP);
+    }
+    else
+        printf("Skip load as requested\n");
+
+    /* exec */
+    if(!no_exec)
+    {
+        ret = hwdev->exec(addr, HWSTUB_EXEC_JUMP);
+        if(ret != hwstub::error::SUCCESS)
+        {
+            fprintf(stderr, "Exec failed: %s\n", error_string(ret).c_str());
+            goto Lerr;
+        }
+    }
+    else
+        printf("Skip exec as requested\n");
 
     return 0;