/* src/vm/jit/arm/linux/md-os.c - machine dependent ARM Linux functions Copyright (C) 1996-2005, 2006, 2007, 2008 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO 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. */ #include "config.h" #include #include #include "vm/types.h" #include "vm/jit/disass.h" #include "vm/jit/arm/md-abi.h" #define ucontext broken_glibc_ucontext #define ucontext_t broken_glibc_ucontext_t #include #undef ucontext #undef ucontext_t typedef struct ucontext { unsigned long uc_flags; struct ucontext *uc_link; stack_t uc_stack; struct sigcontext uc_mcontext; sigset_t uc_sigmask; } ucontext_t; #define scontext_t struct sigcontext #include "threads/thread.h" #include "vm/exceptions.h" #include "vm/signallocal.h" #include "vm/stringlocal.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" /* md_signal_handler_sigsegv *************************************************** Signal handler for hardware exceptions. *******************************************************************************/ void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; scontext_t *_sc; u1 *pv; u1 *sp; u1 *ra; u1 *xpc; u4 mcode; intptr_t addr; int type; intptr_t val; void *p; _uc = (ucontext_t*) _p; _sc = &_uc->uc_mcontext; /* ATTENTION: glibc included messed up kernel headers we needed a workaround for the ucontext structure. */ pv = (u1 *) _sc->arm_ip; sp = (u1 *) _sc->arm_sp; ra = (u1 *) _sc->arm_lr; /* this is correct for leafs */ xpc = (u1 *) _sc->arm_pc; /* get exception-throwing instruction */ if (xpc == NULL) vm_abort("md_signal_handler_sigsegv: the program counter is NULL"); mcode = *((s4 *) xpc); /* this is a NullPointerException */ addr = *((s4 *) _sc + OFFSET(scontext_t, arm_r0)/4 + ((mcode >> 16) & 0x0f)); type = EXCEPTION_HARDWARE_NULLPOINTER; val = 0; if (addr != 0) vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", addr); /* Handle the type. */ p = signal_handle(type, val, pv, sp, ra, xpc, _p); /* set registers */ _sc->arm_r10 = (intptr_t) p; _sc->arm_fp = (intptr_t) xpc; _sc->arm_pc = (intptr_t) asm_handle_exception; } /* md_signal_handler_sigill **************************************************** Illegal Instruction signal handler for hardware exception checks. *******************************************************************************/ void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; scontext_t *_sc; u1 *pv; u1 *sp; u1 *ra; u1 *xpc; u4 mcode; int type; intptr_t val; void *p; _uc = (ucontext_t*) _p; _sc = &_uc->uc_mcontext; /* ATTENTION: glibc included messed up kernel headers we needed a workaround for the ucontext structure. */ pv = (u1 *) _sc->arm_ip; sp = (u1 *) _sc->arm_sp; ra = (u1 *) _sc->arm_lr; /* this is correct for leafs */ xpc = (u1 *) _sc->arm_pc; /* get exception-throwing instruction */ mcode = *((u4 *) xpc); /* check for undefined instruction we use */ if ((mcode & 0x0ff000f0) != 0x07f000f0) { log_println("md_signal_handler_sigill: unknown illegal instruction: inst=%x", mcode); #if defined(ENABLE_DISASSEMBLER) DISASSINSTR(xpc); #endif assert(0); } type = (mcode >> 8) & 0x0fff; val = *((s4 *) _sc + OFFSET(scontext_t, arm_r0)/4 + (mcode & 0x0f)); /* Handle the type. */ p = signal_handle(type, val, pv, sp, ra, xpc, _p); /* set registers if we have an exception, continue execution otherwise (this is needed for patchers to work) */ if (p != NULL) { _sc->arm_r10 = (intptr_t) p; _sc->arm_fp = (intptr_t) xpc; _sc->arm_pc = (intptr_t) asm_handle_exception; } } /* 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; scontext_t *_sc; u1 *pc; u1 *sp; _uc = (ucontext_t *) _p; _sc = &_uc->uc_mcontext; /* get the PC and SP for this thread */ pc = (u1 *) _sc->arm_pc; sp = (u1 *) _sc->arm_sp; /* 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 *thread; ucontext_t *_uc; scontext_t *_sc; u1 *pc; thread = THREADOBJECT; _uc = (ucontext_t*) _p; _sc = &_uc->uc_mcontext; pc = (u1 *) _sc->arm_pc; thread->pc = pc; } #endif /* md_critical_section_restart ************************************************* Search the critical sections tree for a matching section and set the PC to the restart point, if necessary. *******************************************************************************/ #if defined(ENABLE_THREADS) void md_critical_section_restart(ucontext_t *_uc) { scontext_t *_sc; u1 *pc; u1 *npc; _sc = &_uc->uc_mcontext; pc = (u1 *) _sc->arm_pc; npc = critical_find_restart_point(pc); if (npc != NULL) _sc->arm_pc = (ptrint) npc; } #endif /* * 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: */