/* src/vm/jit/mips/linux/md-os.c - machine dependent MIPS 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 /* required for _MIPS_SIM_ABI* defines (before signal.h) */ #include #include #include #include "vm/types.h" #include "vm/jit/mips/codegen.h" #include "vm/jit/mips/md.h" #include "vm/jit/mips/md-abi.h" #include "mm/gc-common.h" #include "mm/memory.h" #include "vm/exceptions.h" #include "vm/signallocal.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" #include "vm/jit/trap.h" /* md_init ********************************************************************* Do some machine dependent initialization. *******************************************************************************/ void md_init(void) { /* The Boehm GC initialization blocks the SIGSEGV signal. So we do a dummy allocation here to ensure that the GC is initialized. */ #if defined(ENABLE_GC_BOEHM) (void) GCNEW(int); #endif #if 0 /* Turn off flush-to-zero */ { union fpc_csr n; n.fc_word = get_fpc_csr(); n.fc_struct.flush = 0; set_fpc_csr(n.fc_word); } #endif } /* md_signal_handler_sigsegv *************************************************** NullPointerException signal handler for hardware null pointer check. *******************************************************************************/ void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; mcontext_t *_mc; greg_t *_gregs; u1 *pv; u1 *sp; u1 *ra; u1 *xpc; unsigned int cause; u4 mcode; int d; int s1; int16_t disp; intptr_t val; intptr_t addr; int type; void *p; _uc = (struct ucontext *) _p; _mc = &_uc->uc_mcontext; #if defined(__UCLIBC__) _gregs = _mc->gpregs; #else _gregs = _mc->gregs; #endif /* In glibc's ucontext.h the registers are defined as long long, even for MIPS32, so we cast them. This is not the case for uClibc. */ pv = (u1 *) (ptrint) _gregs[REG_PV]; sp = (u1 *) (ptrint) _gregs[REG_SP]; ra = (u1 *) (ptrint) _gregs[REG_RA]; /* this is correct for leafs */ #if !defined(__UCLIBC__) # if ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 5)) /* NOTE: We only need this for pre glibc-2.5. */ xpc = (u1 *) (ptrint) _mc->pc; /* get the cause of this exception */ cause = _mc->cause; /* check the cause to find the faulting instruction */ /* TODO: use defines for that stuff */ switch (cause & 0x0000003c) { case 0x00000008: /* TLBL: XPC is ok */ break; case 0x00000010: /* AdEL: XPC is of the following instruction */ xpc = xpc - 4; break; } # else xpc = (u1 *) (ptrint) _mc->pc; # endif #else xpc = (u1 *) (ptrint) _gregs[CTX_EPC]; #endif /* get exception-throwing instruction */ mcode = *((u4 *) xpc); d = M_ITYPE_GET_RT(mcode); s1 = M_ITYPE_GET_RS(mcode); disp = M_ITYPE_GET_IMM(mcode); /* check for special-load */ if (s1 == REG_ZERO) { /* we use the exception type as load displacement */ type = disp; val = _gregs[d]; if (type == TRAP_COMPILER) { /* The XPC is the RA minus 4, because the RA points to the instruction after the call. */ xpc = ra - 4; } } else { /* This is a normal NPE: addr must be NULL and the NPE-type define is 0. */ addr = _gregs[s1]; type = (int) addr; val = 0; } /* Handle the trap. */ p = trap_handle(type, val, pv, sp, ra, xpc, _p); /* Set registers. */ switch (type) { case TRAP_COMPILER: if (p != NULL) { _gregs[REG_PV] = (uintptr_t) p; #if defined(__UCLIBC__) _gregs[CTX_EPC] = (uintptr_t) p; #else _mc->pc = (uintptr_t) p; #endif break; } /* Get and set the PV from the parent Java method. */ pv = md_codegen_get_pv_from_pc(ra); _gregs[REG_PV] = (uintptr_t) pv; /* Get the exception object. */ p = builtin_retrieve_exception(); assert(p != NULL); /* fall-through */ case TRAP_PATCHER: if (p == NULL) { /* We set the PC again because the cause may have changed the XPC. */ #if defined(__UCLIBC__) _gregs[CTX_EPC] = (uintptr_t) xpc; #else _mc->pc = (uintptr_t) xpc; #endif break; } /* fall-through */ default: _gregs[REG_ITMP1_XPTR] = (uintptr_t) p; _gregs[REG_ITMP2_XPC] = (uintptr_t) xpc; #if defined(__UCLIBC__) _gregs[CTX_EPC] = (uintptr_t) asm_handle_exception; #else _mc->pc = (uintptr_t) asm_handle_exception; #endif } } /* md_signal_handler_sigusr2 *************************************************** DOCUMENT ME *******************************************************************************/ void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p) { } /* 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) { mcontext_t *_mc; u1 *pc; u1 *npc; _mc = &_uc->uc_mcontext; #if defined(__UCLIBC__) pc = (u1 *) (ptrint) _mc->gpregs[CTX_EPC]; #else pc = (u1 *) (ptrint) _mc->pc; #endif npc = critical_find_restart_point(pc); if (npc != NULL) { #if defined(__UCLIBC__) _mc->gpregs[CTX_EPC] = (ptrint) npc; #else _mc->pc = (ptrint) npc; #endif } } #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: * vim:noexpandtab:sw=4:ts=4: */