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| 1 /* |
| 2 * Copyright 2014 The Chromium Authors. All rights reserved. |
| 3 * Use of this source code is governed by a BSD-style license that can be |
| 4 * found in the LICENSE file. |
| 5 */ |
| 6 |
| 7 #include "native_client/src/untrusted/irt/irt.h" |
| 8 #include "ppapi/nacl_irt/irt_ppapi.h" |
| 9 #include "ppapi/native_client/src/shared/ppapi_proxy/ppruntime.h" |
| 10 #include "ppapi/native_client/src/untrusted/pnacl_irt_shim/pnacl_shim.h" |
| 11 |
| 12 /* |
| 13 * Defines a version of the version irt_ppapi_start and of the irt_ppapihook |
| 14 * that returns a shimmed GetInterface for PNaCl. |
| 15 * |
| 16 * The hook will be linked into the IRT but it is considered unstable, |
| 17 * should not use that IRT hook. Instead PNaCl nexes should embed the |
| 18 * irt_shim_ppapi_start and the shim functions directly into the nexe |
| 19 * for stability. |
| 20 */ |
| 21 |
| 22 static struct PP_StartFunctions user_start_functions; |
| 23 |
| 24 static int32_t shim_PPPInitializeModule(PP_Module module_id, |
| 25 PPB_GetInterface get_browser_intf) { |
| 26 /* Record the original PPB_GetInterface and provide a shimmed one. */ |
| 27 __set_real_Pnacl_PPBGetInterface(get_browser_intf); |
| 28 return (*user_start_functions.PPP_InitializeModule)(module_id, |
| 29 &__Pnacl_PPBGetInterface); |
| 30 } |
| 31 |
| 32 static void shim_PPPShutdownModule() { |
| 33 (*user_start_functions.PPP_ShutdownModule)(); |
| 34 } |
| 35 |
| 36 #if PNACL_SHIM_AOT |
| 37 /* |
| 38 * This will be overridden by the shim. |
| 39 */ |
| 40 int (*real_irt_ppapi_start)(const struct PP_StartFunctions *) = NULL; |
| 41 #else |
| 42 /* |
| 43 * Otherwise, when linking directly into the IRT, we can refer to the |
| 44 * real irt_ppapi_start. |
| 45 */ |
| 46 extern int irt_ppapi_start(const struct PP_StartFunctions *); |
| 47 static int (* const real_irt_ppapi_start)(const struct PP_StartFunctions *) = |
| 48 &irt_ppapi_start; |
| 49 #endif |
| 50 |
| 51 int irt_shim_ppapi_start(const struct PP_StartFunctions *funcs) { |
| 52 user_start_functions = *funcs; |
| 53 /* |
| 54 * Record the original PPP_GetInterface and provide a shimmed one |
| 55 * via wrapped_ppapi_methods. |
| 56 */ |
| 57 const struct PP_StartFunctions wrapped_ppapi_methods = { |
| 58 shim_PPPInitializeModule, |
| 59 shim_PPPShutdownModule, |
| 60 __Pnacl_PPPGetInterface |
| 61 }; |
| 62 __set_real_Pnacl_PPPGetInterface(user_start_functions.PPP_GetInterface); |
| 63 /* |
| 64 * Invoke the IRT's ppapi_start interface with the wrapped interface. |
| 65 */ |
| 66 return (*real_irt_ppapi_start)(&wrapped_ppapi_methods); |
| 67 } |
| 68 |
| 69 #if !PNACL_SHIM_AOT |
| 70 const struct nacl_irt_ppapihook nacl_irt_shim_ppapihook = { |
| 71 irt_shim_ppapi_start, |
| 72 PpapiPluginRegisterThreadCreator, |
| 73 }; |
| 74 #endif |
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