mirror of
https://github.com/scummvm/scummvm.git
synced 2026-06-20 05:45:29 +00:00
Miro Kropacek
e09b9dfad6
Atari's mintelf platform has ELF support but its libc does not provide
__cxa_atexit / __cxa_finalize, so -fuse-cxa-atexit cannot be used out of
the box. Add a minimal shim (plus a __dso_handle definition for the main
executable) so plugins can register and finalize their function-local
static destructors per DSO on unload.
Note: earlier version ran __cxa_finalize from the host via
findSymbol("__dso_handle"). That works as long as exactly one
__dso_handle ends up in the plugin's symtab (the plugin's own).
When the main binary also defines __dso_handle (so the host's
function-local statics can link with -fuse-cxa-atexit), it breaks: the
plugin link uses --just-symbols=<main binary> and imports that as a
second __dso_handle, and findSymbol can then return the host-imported
one instead of the plugin's own. The two addresses differ, so
__cxa_finalize matches nothing.
The plugin-side helper avoids the ambiguity on every target by using
whichever __dso_handle the plugin's own code already resolved against --
the same one embedded in its __cxa_atexit calls. (PSP2's plugin runtime
has always called __cxa_finalize from inside the plugin for the same
reason; see backends/plugins/psp2/plugin.cpp.)
11 lines
180 B
Plaintext
11 lines
180 B
Plaintext
PLUGIN_getBuildDate
|
|
PLUGIN_getVersion
|
|
PLUGIN_getType
|
|
PLUGIN_getTypeVersion
|
|
PLUGIN_getObject
|
|
PLUGIN_finalize
|
|
___plugin_ctors
|
|
___plugin_ctors_end
|
|
___plugin_dtors
|
|
___plugin_dtors_end
|