/* src/vm/jit/x86_64/linux/md-os.c - machine dependent x86_64 Linux functions Copyright (C) 2007 R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger, Institut f. Computersprachen - TU Wien 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 "config.h" #include #include #include #include #include "vm/types.h" #include "vm/jit/x86_64/codegen.h" #include "vm/jit/x86_64/md.h" #include "threads/threads-common.h" #include "vm/builtin.h" #include "vm/exceptions.h" #include "vm/signallocal.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" /* md_signal_handler_sigsegv *************************************************** Signal handler for hardware exception. *******************************************************************************/ void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; mcontext_t *_mc; void *pv; u1 *sp; u1 *ra; u1 *xpc; u1 opc; u1 mod; u1 rm; s4 d; s4 disp; int type; intptr_t val; void *p; java_object_t *o; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ pv = NULL; /* is resolved during stackframeinfo creation */ sp = (u1 *) _mc->gregs[REG_RSP]; xpc = (u1 *) _mc->gregs[REG_RIP]; ra = xpc; /* return address is equal to XPC */ #if 0 /* check for StackOverflowException */ threads_check_stackoverflow(sp); #endif /* get exception-throwing instruction */ opc = M_ALD_MEM_GET_OPC(xpc); mod = M_ALD_MEM_GET_MOD(xpc); rm = M_ALD_MEM_GET_RM(xpc); /* for values see emit_mov_mem_reg and emit_mem */ if ((opc == 0x8b) && (mod == 0) && (rm == 4)) { /* this was a hardware-exception */ d = M_ALD_MEM_GET_REG(xpc); disp = M_ALD_MEM_GET_DISP(xpc); /* we use the exception type as load displacement */ type = disp; /* XXX FIX ME! */ /* ATTENTION: The _mc->gregs layout is even worse than on i386! See /usr/include/sys/ucontext.h. We need a switch-case here... */ switch (d) { case 0: /* REG_RAX == 13 */ d = REG_RAX; break; case 1: /* REG_RCX == 14 */ d = REG_RCX; break; case 2: /* REG_RDX == 12 */ d = REG_RDX; break; case 3: /* REG_RBX == 11 */ d = REG_RBX; break; case 4: /* REG_RSP == 15 */ d = REG_RSP; break; case 5: /* REG_RBP == 10 */ d = REG_RBP; break; case 6: /* REG_RSI == 9 */ d = REG_RSI; break; case 7: /* REG_RDI == 8 */ d = REG_RDI; break; case 8: /* REG_R8 == 0 */ case 9: /* REG_R9 == 1 */ case 10: /* REG_R10 == 2 */ case 11: /* REG_R11 == 3 */ case 12: /* REG_R12 == 4 */ case 13: /* REG_R13 == 5 */ case 14: /* REG_R14 == 6 */ case 15: /* REG_R15 == 7 */ d = d - 8; break; } val = _mc->gregs[d]; if (type == EXCEPTION_HARDWARE_COMPILER) { /* The PV from the compiler stub is equal to the XPC. */ pv = xpc; /* We use a framesize of zero here because the call pushed the return addres onto the stack. */ ra = md_stacktrace_get_returnaddress(sp, 0); /* Skip the RA on the stack. */ sp = sp + 1 * SIZEOF_VOID_P; /* The XPC is the RA minus 1, because the RA points to the instruction after the call. */ xpc = ra - 3; } } else { /* this was a normal NPE */ type = EXCEPTION_HARDWARE_NULLPOINTER; val = 0; } /* Handle the type. */ p = signal_handle(type, val, pv, sp, ra, xpc, _p); /* Set registers. */ if (type == EXCEPTION_HARDWARE_COMPILER) { if (p == NULL) { o = builtin_retrieve_exception(); _mc->gregs[REG_RSP] = (uintptr_t) sp; /* Remove RA from stack. */ _mc->gregs[REG_RAX] = (uintptr_t) o; _mc->gregs[REG_R10] = (uintptr_t) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (uintptr_t) asm_handle_exception; } else { _mc->gregs[REG_RIP] = (uintptr_t) p; } } else { _mc->gregs[REG_RAX] = (uintptr_t) p; _mc->gregs[REG_R10] = (uintptr_t) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (uintptr_t) asm_handle_exception; } } /* md_signal_handler_sigfpe **************************************************** ArithmeticException signal handler for hardware divide by zero check. *******************************************************************************/ void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; mcontext_t *_mc; u1 *pv; u1 *sp; u1 *ra; u1 *xpc; int type; intptr_t val; void *p; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ pv = NULL; sp = (u1 *) _mc->gregs[REG_RSP]; xpc = (u1 *) _mc->gregs[REG_RIP]; ra = xpc; /* return address is equal to xpc */ /* this is an ArithmeticException */ type = EXCEPTION_HARDWARE_ARITHMETIC; val = 0; /* Handle the type. */ p = signal_handle(type, val, pv, sp, ra, xpc, _p); /* set registers */ _mc->gregs[REG_RAX] = (intptr_t) p; _mc->gregs[REG_R10] = (intptr_t) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (intptr_t) asm_handle_exception; } /* md_signal_handler_sigill **************************************************** Signal handler for patchers. *******************************************************************************/ void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p) { ucontext_t *_uc; mcontext_t *_mc; u1 *pv; u1 *sp; u1 *ra; u1 *xpc; int type; intptr_t val; void *p; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ pv = NULL; sp = (u1 *) _mc->gregs[REG_RSP]; xpc = (u1 *) _mc->gregs[REG_RIP]; ra = xpc; /* return address is equal to xpc */ /* This is a patcher. */ type = EXCEPTION_HARDWARE_PATCHER; val = 0; /* Handle the type. */ p = signal_handle(type, val, pv, sp, ra, xpc, _p); /* set registers */ if (p != NULL) { _mc->gregs[REG_RAX] = (intptr_t) p; _mc->gregs[REG_R10] = (intptr_t) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (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; mcontext_t *_mc; u1 *pc; u1 *sp; _uc = (ucontext_t *) _p; _mc = &_uc->uc_mcontext; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ /* get the PC and SP for this thread */ pc = (u1 *) _mc->gregs[REG_RIP]; sp = (u1 *) _mc->gregs[REG_RSP]; /* 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; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ pc = (u1 *) _mc->gregs[REG_RIP]; t->pc = pc; } #endif /* md_replace_executionstate_read ********************************************** Read the given context into an executionstate for Replacement. *******************************************************************************/ #if defined(ENABLE_REPLACEMENT) void md_replace_executionstate_read(executionstate_t *es, void *context) { ucontext_t *_uc; mcontext_t *_mc; s4 i; s4 d; _uc = (ucontext_t *) context; _mc = &_uc->uc_mcontext; /* read special registers */ es->pc = (u1 *) _mc->gregs[REG_RIP]; es->sp = (u1 *) _mc->gregs[REG_RSP]; es->pv = NULL; /* read integer registers */ for (i = 0; i < INT_REG_CNT; i++) { /* XXX FIX ME! */ switch (i) { case 0: /* REG_RAX == 13 */ d = REG_RAX; break; case 1: /* REG_RCX == 14 */ d = REG_RCX; break; case 2: /* REG_RDX == 12 */ d = REG_RDX; break; case 3: /* REG_RBX == 11 */ d = REG_RBX; break; case 4: /* REG_RSP == 15 */ d = REG_RSP; break; case 5: /* REG_RBP == 10 */ d = REG_RBP; break; case 6: /* REG_RSI == 9 */ d = REG_RSI; break; case 7: /* REG_RDI == 8 */ d = REG_RDI; break; case 8: /* REG_R8 == 0 */ case 9: /* REG_R9 == 1 */ case 10: /* REG_R10 == 2 */ case 11: /* REG_R11 == 3 */ case 12: /* REG_R12 == 4 */ case 13: /* REG_R13 == 5 */ case 14: /* REG_R14 == 6 */ case 15: /* REG_R15 == 7 */ d = i - 8; break; } es->intregs[i] = _mc->gregs[d]; } /* read float registers */ for (i = 0; i < FLT_REG_CNT; i++) es->fltregs[i] = 0xdeadbeefdeadbeefL; } #endif /* md_replace_executionstate_write ********************************************* Write the given executionstate back to the context for Replacement. *******************************************************************************/ #if defined(ENABLE_REPLACEMENT) void md_replace_executionstate_write(executionstate_t *es, void *context) { ucontext_t *_uc; mcontext_t *_mc; s4 i; s4 d; _uc = (ucontext_t *) context; _mc = &_uc->uc_mcontext; /* write integer registers */ for (i = 0; i < INT_REG_CNT; i++) { /* XXX FIX ME! */ switch (i) { case 0: /* REG_RAX == 13 */ d = REG_RAX; break; case 1: /* REG_RCX == 14 */ d = REG_RCX; break; case 2: /* REG_RDX == 12 */ d = REG_RDX; break; case 3: /* REG_RBX == 11 */ d = REG_RBX; break; case 4: /* REG_RSP == 15 */ d = REG_RSP; break; case 5: /* REG_RBP == 10 */ d = REG_RBP; break; case 6: /* REG_RSI == 9 */ d = REG_RSI; break; case 7: /* REG_RDI == 8 */ d = REG_RDI; break; case 8: /* REG_R8 == 0 */ case 9: /* REG_R9 == 1 */ case 10: /* REG_R10 == 2 */ case 11: /* REG_R11 == 3 */ case 12: /* REG_R12 == 4 */ case 13: /* REG_R13 == 5 */ case 14: /* REG_R14 == 6 */ case 15: /* REG_R15 == 7 */ d = i - 8; break; } _mc->gregs[d] = es->intregs[i]; } /* write special registers */ _mc->gregs[REG_RIP] = (ptrint) es->pc; _mc->gregs[REG_RSP] = (ptrint) es->sp; } #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) { mcontext_t *_mc; u1 *pc; u1 *npc; _mc = &_uc->uc_mcontext; /* ATTENTION: Don't use CACAO's internal REG_* defines as they are different to the ones in . */ pc = (u1 *) _mc->gregs[REG_RIP]; npc = critical_find_restart_point(pc); if (npc != NULL) _mc->gregs[REG_RIP] = (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: * vim:noexpandtab:sw=4:ts=4: */