/* src/vm/jit/i386/linux/md-os.c - machine dependent i386 Linux functions Copyright (C) 1996-2005, 2006, 2007, 2008 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO Copyright (C) 2009 Theobroma Systems Ltd. This file is part of CACAO. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #define _GNU_SOURCE /* include REG_ defines from ucontext.h */ #include "config.h" #include #include #include "vm/types.h" #include "vm/jit/i386/codegen.h" #include "vm/jit/i386/md.h" #include "threads/thread.hpp" #include "vm/signallocal.hpp" #include "vm/jit/executionstate.h" #include "vm/jit/trap.hpp" /** * Signal handler for hardware exceptions. */ void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p) { ucontext_t* _uc = (ucontext_t *) _p; mcontext_t* _mc = &_uc->uc_mcontext; void* xpc = (void*) _mc->gregs[REG_EIP]; // Handle the trap. trap_handle(TRAP_SIGSEGV, xpc, _p); } /** * Signal handler for hardware divide by zero (ArithmeticException) * check. */ void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p) { ucontext_t* _uc = (ucontext_t *) _p; mcontext_t* _mc = &_uc->uc_mcontext; void* xpc = (void*) _mc->gregs[REG_EIP]; // Handle the trap. trap_handle(TRAP_SIGFPE, xpc, _p); } /** * Signal handler for hardware patcher traps (ud2). */ void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p) { ucontext_t* _uc = (ucontext_t *) _p; mcontext_t* _mc = &_uc->uc_mcontext; void* xpc = (void*) _mc->gregs[REG_EIP]; // Handle the trap. trap_handle(TRAP_SIGILL, xpc, _p); } /* md_signal_handler_sigusr1 *************************************************** Signal handler for suspending threads. *******************************************************************************/ #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO) void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; mcontext_t *_mc; u1 *pc; u1 *sp; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; /* get the PC and SP for this thread */ pc = (u1 *) _mc->gregs[REG_EIP]; sp = (u1 *) _mc->gregs[REG_ESP]; /* now suspend the current thread */ threads_suspend_ack(pc, sp); } #endif /* md_signal_handler_sigusr2 *************************************************** Signal handler for profiling sampling. *******************************************************************************/ #if defined(ENABLE_THREADS) void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p) { threadobject *t; ucontext_t *_uc; mcontext_t *_mc; u1 *pc; t = THREADOBJECT; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; pc = (u1 *) _mc->gregs[REG_EIP]; t->pc = pc; } #endif /* md_executionstate_read ****************************************************** Read the given context into an executionstate for Replacement. *******************************************************************************/ void md_executionstate_read(executionstate_t *es, void *context) { ucontext_t *_uc; mcontext_t *_mc; s4 i; _uc = (ucontext_t *) context; _mc = &_uc->uc_mcontext; /* read special registers */ es->pc = (u1 *) _mc->gregs[REG_EIP]; es->sp = (u1 *) _mc->gregs[REG_ESP]; es->pv = NULL; /* pv must be looked up via AVL tree */ /* read integer registers */ for (i = 0; i < INT_REG_CNT; i++) es->intregs[i] = _mc->gregs[REG_EAX - i]; /* read float registers */ for (i = 0; i < FLT_REG_CNT; i++) es->fltregs[i] = 0xdeadbeefdeadbeefULL; } /* md_executionstate_write ***************************************************** Write the given executionstate back to the context for Replacement. *******************************************************************************/ void md_executionstate_write(executionstate_t *es, void *context) { ucontext_t *_uc; mcontext_t *_mc; s4 i; _uc = (ucontext_t *) context; _mc = &_uc->uc_mcontext; /* write integer registers */ for (i = 0; i < INT_REG_CNT; i++) _mc->gregs[REG_EAX - i] = es->intregs[i]; /* write special registers */ _mc->gregs[REG_EIP] = (ptrint) es->pc; _mc->gregs[REG_ESP] = (ptrint) es->sp; } /* * These are local overrides for various environment variables in Emacs. * Please do not remove this and leave it at the end of the file, where * Emacs will automagically detect them. * --------------------------------------------------------------------- * Local variables: * mode: c * indent-tabs-mode: t * c-basic-offset: 4 * tab-width: 4 * End: */