/* src/vm/jit/mips/md.c - machine dependent MIPS 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 4654 2006-03-19 19:46:11Z edwin $ */ #include "config.h" #include #include #include #include #include "vm/types.h" #include "toolbox/logging.h" #include "vm/global.h" #include "vm/jit/stacktrace.h" #include "vm/options.h" /* XXX debug */ #include "vm/jit/disass.h" /* XXX debug */ void docacheflush(u1 *p, long bytelen) { u1 *e = p + bytelen; long psize = sysconf(_SC_PAGESIZE); p -= (long) p & (psize - 1); e += psize - ((((long) e - 1) & (psize - 1)) + 1); bytelen = e-p; mprotect(p, bytelen, PROT_READ | PROT_WRITE | PROT_EXEC); } /* 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 MIPS the return address is located on the top of the stackframe */ /* XXX change this if we ever want to use 4-byte stackslots */ /* ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P)); */ ra = *((u1 **) (sp + framesize - 8)); return ra; } /* md_assembler_get_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). *******************************************************************************/ u1 *md_assembler_get_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr) { u4 mcode; s4 offset; u1 *pa; /* go back to the actual load instruction (3 instructions on MIPS) */ ra -= 3 * 4; /* get first instruction word on current PC */ mcode = *((u4 *) ra); /* check if we have 2 instructions (lui) */ if ((mcode >> 16) == 0x3c19) { /* XXX write a regression for this */ assert(0); /* get displacement of first instruction (lui) */ offset = (s4) (mcode << 16); /* get displacement of second instruction (daddiu) */ mcode = *((u4 *) (ra + 1 * 4)); assert((mcode >> 16) != 0x6739); offset += (s2) (mcode & 0x0000ffff); } else { /* get first instruction (ld) */ mcode = *((u4 *) ra); /* get the offset from the instruction */ offset = (s2) (mcode & 0x0000ffff); /* check for call with REG_METHODPTR: ld s8,x(t9) */ #if SIZEOF_VOID_P == 8 if ((mcode >> 16) == 0xdf3e) { #else if ((mcode >> 16) == 0x8f3e) { #endif /* in this case we use the passed method pointer */ pa = mptr + offset; } else { /* in the normal case we check for a `ld s8,x(s8)' instruction */ #if SIZEOF_VOID_P == 8 assert((mcode >> 16) == 0xdfde); #else assert((mcode >> 16) == 0x8fde); #endif /* and get the final data segment address */ pa = sfi->pv + offset; } } return pa; } /* md_codegen_findmethod ******************************************************* Machine code: 03c0f809 jalr s8 00000000 nop 27feff9c addiu s8,ra,-100 *******************************************************************************/ u1 *md_codegen_findmethod(u1 *ra) { u1 *pv; u4 mcode; s4 offset; /* get the offset of the instructions */ /* get first instruction word after jump */ mcode = *((u4 *) ra); /* check if we have 2 instructions (lui, daddiu) */ if ((mcode >> 16) == 0x3c19) { /* get displacement of first instruction (lui) */ offset = (s4) (mcode << 16); /* get displacement of second instruction (daddiu) */ mcode = *((u4 *) (ra + 1 * 4)); #if SIZEOF_VOID_P == 8 assert((mcode >> 16) == 0x6739); #else assert((mcode >> 16) == 0x2739); #endif offset += (s2) (mcode & 0x0000ffff); } else { /* get offset of first instruction (daddiu) */ mcode = *((u4 *) ra); #if SIZEOF_VOID_P == 8 assert((mcode >> 16) == 0x67fe); #else assert((mcode >> 16) == 0x27fe); #endif offset = (s2) (mcode & 0x0000ffff); } /* calculate PV via RA + offset */ pv = ra + offset; return pv; } /* md_cacheflush *************************************************************** Calls the system's function to flush the instruction and data cache. *******************************************************************************/ void md_cacheflush(u1 *addr, s4 nbytes) { cacheflush(addr, nbytes, BCACHE); } /* md_icacheflush ************************************************************** Calls the system's function to flush the instruction cache. *******************************************************************************/ void md_icacheflush(u1 *addr, s4 nbytes) { cacheflush(addr, nbytes, ICACHE); } /* md_dcacheflush ************************************************************** Calls the system's function to flush the data cache. *******************************************************************************/ void md_dcacheflush(u1 *addr, s4 nbytes) { cacheflush(addr, nbytes, DCACHE); } /* md_patch_replacement_point ************************************************** Patch the given replacement point. *******************************************************************************/ void md_patch_replacement_point(rplpoint *rp) { u8 mcode; /* save the current machine code */ mcode = *(u8*)rp->pc; /* write the new machine code */ *(u8*)(rp->pc) = rp->mcode; /* store saved mcode */ rp->mcode = mcode; { u1* u1ptr = rp->pc; DISASSINSTR(u1ptr); DISASSINSTR(u1ptr); fflush(stdout); } /* flush instruction cache */ md_icacheflush(rp->pc,2*4); } /* * 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: */