hwstub_shell: add support for call and jump

Change-Id: Ie09d0db21831b79255da858bada7382a08ff4eef
Reviewed-on: http://gerrit.rockbox.org/1052
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
Tested: Marcin Bukat <marcin.bukat@gmail.com>

utils/hwstub/tools/hwstub_shell.cpp

@@ -206,6 +206,26 @@ int my_lua_writen(lua_State *state)
     return 0;
 }
 
+int my_lua_call(lua_State *state)
+{
+    int n = lua_gettop(state);
+    if(n != 1)
+        luaL_error(state, "call takes target address argument");
+
+    hwstub_call(g_hwdev, luaL_checkunsigned(state, 1));
+    return 0;
+}
+
+int my_lua_jump(lua_State *state)
+{
+    int n = lua_gettop(state);
+    if(n != 1)
+        luaL_error(state, "jump takes target address argument");
+
+    hwstub_jump(g_hwdev, luaL_checkunsigned(state, 1));
+    return 0;
+}
+
 int my_lua_printlog(lua_State *state)
 {
     print_log(g_hwdev);
@@ -329,6 +349,10 @@ bool my_lua_import_hwstub()
     lua_setfield(g_lua, -2, "write32");
     lua_pushcclosure(g_lua, my_lua_printlog, 0);
     lua_setfield(g_lua, -2, "print_log");
+    lua_pushcclosure(g_lua, my_lua_call, 0);
+    lua_setfield(g_lua, -2, "call");
+    lua_pushcclosure(g_lua, my_lua_jump, 0);
+    lua_setfield(g_lua, -2, "jump");
 
     lua_setfield(g_lua, -2, "dev");
 

utils/hwstub/tools/init.lua

@@ -40,6 +40,8 @@ do
     h:add("It contains some information about the device and the following methods.");
     h:add("* read8/16/32(a) reads a 8/16/32-bit integer at address a atomically");
     h:add("* write8/16/32(a, v) writes the 8/16/32-bit integer v at address a atomically");
+    h:add("* jump(a) jump to specified address");
+    h:add("* call(a) call function at specified address and return to hwstub");
     h:add("* print_log() prints the device log");
 
     h = HELP:create_topic("HW");

utils/hwstub/tools/lua/hwlib.lua

@@ -0,0 +1,27 @@
+HWLIB = {}
+
+local h = HELP:create_topic("HWLIB")
+h:add("This table contains helper functions for use inside hwstub_shell")
+
+local hh = h:create_topic("load_blob")
+hh:add("load_blob(filename, address) -- this function loads raw binary blob from the file filename")
+hh:add("                                at specified address in memory. No cache coherency is")
+hh:add("                                guaranteed")
+
+hh = h:create_topic("printf")
+hh:add("printf(s,...) -- this function is simple wrapper around string.format to emulate")
+hh:add("                 C printf() function")
+
+function HWLIB.load_blob(filename, address)
+    local f = assert(io.open(filename, "rb"))
+    local bytes = f:read("*all")
+    for b in string.gmatch(bytes, ".") do
+        DEV.write8(address, string.byte(b))
+        address = address + 1
+    end
+    io.close(f)
+end
+
+function HWLIB.printf(s,...)
+    return io.write(s:format(...))
+end

utils/hwstub/tools/lua/load.lua

@@ -10,4 +10,5 @@ elseif hwstub.dev.target.id == hwstub.dev.target.ATJ then
     require "atj"
 end
 
+require "hwlib"
 require "dumper"