/* * Copyright (c) 2018, 2020 Ariadne Conill * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * This software is provided 'as is' and without any warranty, express or * implied. In no event shall the authors be liable for any damages arising * from the use of this software. */ #include "defs.h" FUNC(libucontext_trampoline) /* get the proper context into position and test for NULL */ leal (%esp,%ebx,4), %esp cmpl $0, (%esp) /* restore global offset table, exit@plt and libucontext_setcontext@plt need this */ call __i686_get_pc_thunk_bx addl $_GLOBAL_OFFSET_TABLE_, %ebx /* if we have no linked context, lets get out of here */ je no_linked_context /* call setcontext to switch to the linked context */ call libucontext_setcontext@plt movl %eax, (%esp) no_linked_context: /* we are returning into a null context, it seems, so maybe we should exit */ call exit@plt /* something is really hosed, call hlt to force termination */ hlt __i686_get_pc_thunk_bx: mov (%esp), %ebx ret END(libucontext_trampoline)