From e26110cfc67d48331a76e9b1e6f7fed7569e1ab3 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Mon, 10 Feb 2014 14:48:57 +0800 Subject: module: implement module loading This patch adds loading, stamp checking and initialization of modules. The init function of dynamic module is no longer directly called as __attribute__((constructor)) in static linked version, it is called only after passed the checking of presense of stamp symbol: qemu_stamp_$RELEASEHASH where $RELEASEHASH is generated by hashing version strings and content of configure script. With this, modules built from a different tree/version/configure will not be loaded. The module loading code requires gmodule-2.0. Modules are searched under - CONFIG_MODDIR - executable folder (to allow running qemu-{img,io} in the build directory) - ../ of executable folder (to allow running system emulator in the build directory) Modules are linked under their subdir respectively, then copied to top level of build directory for above convinience, e.g.: $(BUILD_DIR)/block/curl.so -> $(BUILD_DIR)/block-curl.so Signed-off-by: Paolo Bonzini Signed-off-by: Fam Zheng Signed-off-by: Paolo Bonzini --- include/qemu/module.h | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'include/qemu/module.h') diff --git a/include/qemu/module.h b/include/qemu/module.h index c4ccd57..72d9498 100644 --- a/include/qemu/module.h +++ b/include/qemu/module.h @@ -14,11 +14,31 @@ #ifndef QEMU_MODULE_H #define QEMU_MODULE_H +#include "qemu/osdep.h" + +#define DSO_STAMP_FUN glue(qemu_stamp, CONFIG_STAMP) +#define DSO_STAMP_FUN_STR stringify(DSO_STAMP_FUN) + +#ifdef BUILD_DSO +void DSO_STAMP_FUN(void); +/* This is a dummy symbol to identify a loaded DSO as a QEMU module, so we can + * distinguish "version mismatch" from "not a QEMU module", when the stamp + * check fails during module loading */ +void qemu_module_dummy(void); + +#define module_init(function, type) \ +static void __attribute__((constructor)) do_qemu_init_ ## function(void) \ +{ \ + register_dso_module_init(function, type); \ +} +#else /* This should not be used directly. Use block_init etc. instead. */ #define module_init(function, type) \ -static void __attribute__((constructor)) do_qemu_init_ ## function(void) { \ +static void __attribute__((constructor)) do_qemu_init_ ## function(void) \ +{ \ register_module_init(function, type); \ } +#endif typedef enum { MODULE_INIT_BLOCK, @@ -34,6 +54,7 @@ typedef enum { #define type_init(function) module_init(function, MODULE_INIT_QOM) void register_module_init(void (*fn)(void), module_init_type type); +void register_dso_module_init(void (*fn)(void), module_init_type type); void module_call_init(module_init_type type); -- cgit v1.1