/* src/vm/jit/x86_64/md.c - machine dependent x86_64 Linux functions Copyright (C) 1996-2005, 2006 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. Contact: cacao@cacaojvm.org Authors: Christian Thalinger Changes: Edwin Steiner $Id: md.c 7283 2007-02-04 19:41:14Z pm $ */ #define REG_RSP 0 #define REG_RIP 0 #define REG_RAX 0 #define REG_R10 0 #define REG_ITMP2 0 #define REG_RIP 0 #define REG_RSP 0 #define REG_RIP 0 #define REG_RAX 0 #define REG_R10 0 #define REG_ITMP2 0 #define REG_RIP 0 #define REG_METHODPTR 0 #define _GNU_SOURCE #include "config.h" #include #include #include #include "vm/jit/s390/md-abi.h" #if defined(ENABLE_THREADS) # include "threads/native/threads.h" #endif #include "vm/exceptions.h" #include "vm/signallocal.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) #include "vm/options.h" /* XXX debug */ #include "vm/jit/disass.h" /* XXX debug */ #endif #include #define OOPS() assert(0); /* md_init ********************************************************************* Do some machine dependent initialization. *******************************************************************************/ void md_init(void) { /* nothing to do */ } /* 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; u1 *sp; u1 *ra; u1 *xpc; _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 . */ 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 _mc->gregs[REG_RAX] = (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc); _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (ptrint) 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 *sp; u1 *ra; u1 *xpc; _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 . */ sp = (u1 *) _mc->gregs[REG_RSP]; xpc = (u1 *) _mc->gregs[REG_RIP]; ra = xpc; /* return address is equal to xpc */ _mc->gregs[REG_RAX] = (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc); _mc->gregs[REG_R10] = (ptrint) xpc; /* REG_ITMP2_XPC */ _mc->gregs[REG_RIP] = (ptrint) asm_handle_exception; } /* 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 #if defined(ENABLE_THREADS) void thread_restartcriticalsection(ucontext_t *_uc) { mcontext_t *_mc; void *pc; _mc = &_uc->uc_mcontext; pc = critical_find_restart_point((void *) _mc->gregs[REG_RIP]); if (pc != NULL) _mc->gregs[REG_RIP] = (ptrint) pc; } #endif /* md_codegen_patch_branch ***************************************************** Back-patches a branch instruction. *******************************************************************************/ void md_codegen_patch_branch(codegendata *cd, s4 branchmpc, s4 targetmpc) { s4 *mcodeptr; s4 disp; /* branch displacement */ /* calculate the patch position */ mcodeptr = (s4 *) (cd->mcodebase + branchmpc); /* Calculate the branch displacement. */ disp = targetmpc - branchmpc; disp += 4; /* size of branch */ disp /= 2; /* specified in halfwords */ /* TODO check for overflow */ /* patch the branch instruction before the mcodeptr */ mcodeptr[-1] |= (disp & 0xFFFF); } /* md_stacktrace_get_returnaddress ********************************************* Returns the return address of the current stackframe, specified by the passed stack pointer and the stack frame size. *******************************************************************************/ u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize) { u1 *ra; /* on S390 the return address is located on the top of the stackframe */ /* TODO is this true? hope so, copyed from alpha */ ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); return ra; } /* md_get_method_patch_address ************************************************* Gets the patch address of the currently compiled method. The offset is extracted from the load instruction(s) before the jump and added to the right base address (PV or REG_METHODPTR). INVOKESTATIC/SPECIAL: 0x7748d7b2: a7 18 ff d4 lhi %r1,-44 (load dseg offset) 0x7748d7b6: 58 d1 d0 00 l %r13,0(%r1,%r13) (load pv) 0x7748d7ba: 0d ed basr %r14,%r13 (jump to pv) INVOKEVIRTUAL: 0x7748d82a: 58 c0 20 00 l %r12,0(%r2) (load mptr) 0x7748d82e: 58 d0 c0 00 l %r13,0(%r12) (load pv from mptr) 0x7748d832: 0d ed basr %r14,%r13 (jump to pv) INVOKEINTERFACE: last 2 instructions the same as in invokevirtual *******************************************************************************/ u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr) { u1 base; s4 offset; u1 *pa; /* patch address */ /* go back to the load before the call instruction */ ra = ra - 2 /* sizeof bcr */ - 4 /* sizeof l */; /* get the base register of the load */ base = ra[2] >> 4; /* check for the different calls */ if (base == 0xd) { /* pv relative */ /* INVOKESTATIC/SPECIAL */ /* the offset is in the load before the load */ offset = *((s2 *) (ra - 2)); /* add the offset to the procedure vector */ pa = sfi->pv + offset; } else if (base == 0xc) { /* mptr relative */ /* INVOKEVIRTUAL/INTERFACE */ offset = *((u2 *)(ra + 2)) & 0xFFF; /* add offset to method pointer */ pa = mptr + offset; } else { /* catch any problems */ assert(0); } return pa; } /* md_codegen_get_pv_from_pc *************************************************** On this architecture just a wrapper function to codegen_get_pv_from_pc. *******************************************************************************/ u1 *md_codegen_get_pv_from_pc(u1 *ra) { u1 *pv; /* Get the start address of the function which contains this address from the method table. */ pv = codegen_get_pv_from_pc(ra); return pv; } /* md_cacheflush *************************************************************** Calls the system's function to flush the instruction and data cache. *******************************************************************************/ void md_cacheflush(u1 *addr, s4 nbytes) { /* do nothing */ } /* md_icacheflush ************************************************************** Calls the system's function to flush the instruction cache. *******************************************************************************/ void md_icacheflush(u1 *addr, s4 nbytes) { /* do nothing */ } /* md_dcacheflush ************************************************************** Calls the system's function to flush the data cache. *******************************************************************************/ void md_dcacheflush(u1 *addr, s4 nbytes) { /* do nothing */ } /* md_patch_replacement_point ************************************************** Patch the given replacement point. *******************************************************************************/ #if 0 void md_patch_replacement_point(rplpoint *rp) { u8 mcode; /* XXX this is probably unsafe! */ /* save the current machine code */ mcode = *(u8*)rp->pc; /* write spinning instruction */ *(u2*)(rp->pc) = 0xebfe; /* write 5th byte */ rp->pc[4] = (rp->mcode >> 32); /* write first word */ *(u4*)(rp->pc) = (u4) rp->mcode; /* store saved mcode */ rp->mcode = mcode; #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) { u1* u1ptr = rp->pc; DISASSINSTR(u1ptr); fflush(stdout); } #endif /* XXX if required asm_cacheflush(rp->pc,8); */ } #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: */