/* src/vm/jit/m68k/linux/md-os.c - m68k linux specific 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 "vm/jit/m68k/md.h" #include "vm/jit/m68k/linux/md-abi.h" #include "vm/signallocal.h" #include "vm/vm.hpp" #include "vm/jit/asmpart.h" #include "vm/jit/trap.h" #include #include /*#include */ #include #include /* has br0ken ucontext_t*/ /* * The glibc bundeled with my devels system ucontext.h differs with kernels ucontext.h. Not good. * The following stuff is taken from 2.6.10 + freescale coldfire patches: */ typedef struct actual_fpregset { int f_fpcntl[3]; int f_fpregs[8*3]; } actual_fpregset_t; typedef struct actual_mcontext { int version; gregset_t gregs; /* 0...7 = %d0-%d7, 8...15 = %a0-%a7 */ actual_fpregset_t fpregs; } actual_mcontext_t; #define GREGS_ADRREG_OFF 8 typedef struct actual_ucontext { unsigned long uc_flags; struct actual_ucontext *uc_link; stack_t uc_stack; struct actual_mcontext uc_mcontext; unsigned long uc_filler[80]; sigset_t uc_sigmask; /* mask last for extensibility */ } actual_ucontext_t; /* md_signal_handler_sigsegv ****************************************** * * Invoked when a Nullpointerexception occured, or when the vm * crashes, hard to tell the difference. **********************************************************************/ void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p) { uint32_t xpc, sp; uint16_t opc; uint32_t val, regval, off; bool adrreg; void *p; actual_mcontext_t *_mc; actual_ucontext_t *_uc; int type; _uc = (actual_ucontext_t*)_p; _mc = &_uc->uc_mcontext; sp = _mc->gregs[R_SP]; xpc = _mc->gregs[R_PC]; opc = *(uint16_t*)xpc; /* m68k uses a whole bunch of difficult to differ load instructions where null pointer check could occure */ /* the first two are 2*32bit sized */ adrreg = false; off = 0; if ((opc & ((2<<12) | (5<<3))) == ((2<<12) | (5<<3))) { if (opc & (1<<6)) adrreg = true; /* M_XLD */ val = opc & 0x0007; off = *(uint16_t*)(xpc+1); } else if ((opc & ((2<<12) | (5<<6))) == ((2<<12) | (5<<6))) { if (opc & (1<<3)) adrreg = true; /* M_XST */ val = (opc >> 9) & 0x0007; off = *(uint16_t*)(xpc+1); } else { /*fprintf(stderr, "SEGV: short instructions %x\n", opc); */ /* now check the 32 bit sized instructions */ if ((opc & (2<<3)) == (2<<3)) { if (opc & (1<<6)) adrreg = true; /* M_L*X */ val = opc & 0x0007; } else if ((opc & (2<<6)) == (2<<6)) { if (opc & (1<<3)) adrreg = true; /* M_S*X */ val = (opc >> 9) & 0x0007; } else { vm_abort("md_signal_handler_sigsegv: unhandeled faulting opcode %x", opc); } } /* val is now register number, adreg == true if it is an address regsiter */ regval = _mc->gregs[adrreg ? GREGS_ADRREG_OFF + val : val]; type = regval; /* Handle the type. */ p = trap_handle(type, regval, NULL, (void*)sp, (void*)xpc, (void*)xpc, _p); _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (intptr_t) p; _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (intptr_t) xpc; _mc->gregs[R_PC] = (intptr_t) asm_handle_exception; } /* md_signal_handler_sigill ******************************************* * * This handler is used to generate hardware exceptions. * Type of exception derived from trap number. * If an object is needed a tst instruction (2 byte long) has * been created directly before the trap instruction (2 bytes long). * the last 3 bit of this tst instruction contain the register number. **********************************************************************/ void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p) { uint32_t xpc, sp, ra, pv; uint16_t opc; uint32_t type; uint32_t regval; void *p; actual_mcontext_t *_mc; actual_ucontext_t *_uc; _uc = (actual_ucontext_t*)_p; xpc = (uint32_t)siginfo->si_addr; pv = NULL; /* we have no pv */ ra = xpc; /* that is ture for most cases */ if (siginfo->si_code == ILL_ILLOPC) { vm_abort("md_signal_handler_sigill: the illegal instruction @ 0x%x, aborting", xpc); } if (siginfo->si_code != ILL_ILLTRP) { vm_abort("md_signal_handler_sigill: Caught something not a trap"); } opc = *(uint16_t*)(xpc-2); assert( (opc&0xfff0) == 0x4e40 ); type = opc & 0x000f; /* filter trap number */ _mc = &_uc->uc_mcontext; sp = _mc->gregs[R_SP]; /* Figure out in which register the object causing the exception resides for appropiate exceptions */ switch (type) { case TRAP_NullPointerException: case TRAP_ArithmeticException: case TRAP_CHECK_EXCEPTION: /* nothing */ break; case TRAP_ClassCastException: regval = *(uint16_t*)(xpc-4); assert( (regval&0xfff0) == 0x4a00 ); /* was in a address register */ regval = _mc->gregs[ GREGS_ADRREG_OFF + (regval & 0x7) ]; break; case TRAP_ArrayIndexOutOfBoundsException: regval = *(uint16_t*)(xpc-4); assert( (regval&0xfff0) == 0x4a00 ); /* was a data register */ regval = _mc->gregs[regval & 0x7]; break; case TRAP_COMPILER: regval = *(uint16_t*)(xpc-4); assert( (regval&0xfff0) == 0x4a00 ); /* was in a address register */ regval = _mc->gregs[ GREGS_ADRREG_OFF + (regval & 0x7) ]; pv = xpc-4; /* the compiler stub consists of 2 instructions */ ra = md_stacktrace_get_returnaddress(sp, 0); sp = sp + SIZEOF_VOID_P; xpc = ra - 2; break; case TRAP_PATCHER: xpc -= 2; ra = xpc; break; } /* Handle the trap. */ p = trap_handle(type, regval, pv, (void*)sp, (void*)ra, (void*)xpc, _p); switch (type) { case TRAP_COMPILER: if (p == NULL) { /* exception when compiling the method */ java_object_t *o = builtin_retrieve_exception(); _mc->gregs[R_SP] = sp; /* remove RA from stack */ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (uintptr_t) o; _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (uintptr_t) xpc; _mc->gregs[R_PC] = (uintptr_t) asm_handle_exception; } else { /* compilation ok, execute */ _mc->gregs[R_PC] = p; } break; case TRAP_PATCHER: if (p == NULL) { /* No exception while patching, continue. */ _mc->gregs[R_PC] = xpc; return; } /* fall-through in case of exception */ default: /* a normal exception with normal expcetion handling */ _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (uintptr_t) p; _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (uintptr_t) xpc; _mc->gregs[R_PC] = (uintptr_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; 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[R_PC]; sp = (u1 *) _mc->gregs[R_SP]; /* now suspend the current thread */ threads_suspend_ack(pc, sp); } #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: */