e26110cfc6
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 <pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/*
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* QEMU Module Infrastructure
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*
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* Copyright IBM, Corp. 2009
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_MODULE_H
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#define QEMU_MODULE_H
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#include "qemu/osdep.h"
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#define DSO_STAMP_FUN glue(qemu_stamp, CONFIG_STAMP)
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#define DSO_STAMP_FUN_STR stringify(DSO_STAMP_FUN)
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#ifdef BUILD_DSO
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void DSO_STAMP_FUN(void);
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/* This is a dummy symbol to identify a loaded DSO as a QEMU module, so we can
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* distinguish "version mismatch" from "not a QEMU module", when the stamp
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* check fails during module loading */
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void qemu_module_dummy(void);
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#define module_init(function, type) \
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static void __attribute__((constructor)) do_qemu_init_ ## function(void) \
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{ \
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register_dso_module_init(function, type); \
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}
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#else
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/* This should not be used directly. Use block_init etc. instead. */
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#define module_init(function, type) \
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static void __attribute__((constructor)) do_qemu_init_ ## function(void) \
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{ \
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register_module_init(function, type); \
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}
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#endif
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typedef enum {
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MODULE_INIT_BLOCK,
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MODULE_INIT_MACHINE,
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MODULE_INIT_QAPI,
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MODULE_INIT_QOM,
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MODULE_INIT_MAX
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} module_init_type;
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#define block_init(function) module_init(function, MODULE_INIT_BLOCK)
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#define machine_init(function) module_init(function, MODULE_INIT_MACHINE)
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#define qapi_init(function) module_init(function, MODULE_INIT_QAPI)
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#define type_init(function) module_init(function, MODULE_INIT_QOM)
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void register_module_init(void (*fn)(void), module_init_type type);
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void register_dso_module_init(void (*fn)(void), module_init_type type);
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void module_call_init(module_init_type type);
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#endif
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