/* src/vm/jit/powerpc/md.c - machine dependent PowerPC functions Copyright (C) 1996-2005, 2006, 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. $Id: md.c 7596 2007-03-28 21:05:53Z twisti $ */ #include "config.h" #include #include "vm/types.h" #include "md-abi.h" #include "vm/jit/powerpc/codegen.h" #include "vm/global.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) # include "vm/jit/disass.h" /* XXX debug */ # include "vmcore/options.h" /* XXX debug */ #endif /* md_init ********************************************************************* Do some machine dependent initialization. *******************************************************************************/ void md_init(void) { /* nothing to do */ } /* 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 PowerPC the return address is located in the linkage area */ ra = *((u1 **) (sp + framesize + LA_LR_OFFSET)); 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: 81adffd4 lwz r13,-44(r13) 7da903a6 mtctr r13 4e800421 bctrl INVOKEVIRTUAL: 81830000 lwz r12,0(r3) 81ac0000 lwz r13,0(r12) 7da903a6 mtctr r13 4e800421 bctrl INVOKEINTERFACE: 81830000 lwz r12,0(r3) 818c0000 lwz r12,0(r12) 81ac0000 lwz r13,0(r12) 7da903a6 mtctr r13 4e800421 bctrl *******************************************************************************/ u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr) { u4 mcode; s4 offset; u1 *pa; /* go back to the actual load instruction (3 instructions) */ ra = ra - 3 * 4; /* get first instruction word (lwz) */ mcode = *((u4 *) ra); /* check if we have 2 instructions (addis, addi) */ if ((mcode >> 16) == 0x3c19) { /* XXX write a regression for this */ assert(0); /* get displacement of first instruction (addis) */ offset = (s4) (mcode << 16); /* get displacement of second instruction (addi) */ mcode = *((u4 *) (ra + 1 * 4)); assert((mcode >> 16) != 0x6739); offset += (s2) (mcode & 0x0000ffff); } else { /* get the offset from the instruction */ offset = (s2) (mcode & 0x0000ffff); /* check for load from PV */ if ((mcode >> 16) == 0x81ad) { /* get the final data segment address */ pa = sfi->pv + offset; } else if ((mcode >> 16) == 0x81ac) { /* in this case we use the passed method pointer */ /* return NULL if no mptr was specified (used for replacement) */ if (mptr == NULL) return NULL; pa = mptr + offset; } else { /* catch any problems */ assert(0); } } return pa; } /* md_codegen_get_pv_from_pc *************************************************** Machine code: 7d6802a6 mflr r11 39abffe0 addi r13,r11,-32 or 7d6802a6 mflr r11 3dabffff addis r13,r11,-1 39ad68b0 addi r13,r13,26800 *******************************************************************************/ u1 *md_codegen_get_pv_from_pc(u1 *ra) { u1 *pv; u4 mcode; s4 offset; /* get first instruction word after jump */ mcode = *((u4 *) (ra + 1 * 4)); /* check if we have 2 instructions (addis, addi) */ if ((mcode >> 16) == 0x3dab) { /* get displacement of first instruction (addis) */ offset = (s4) (mcode << 16); /* get displacement of second instruction (addi) */ mcode = *((u4 *) (ra + 2 * 4)); /* check for addi instruction */ assert((mcode >> 16) == 0x39ad); offset += (s2) (mcode & 0x0000ffff); } else { /* check for addi instruction */ assert((mcode >> 16) == 0x39ab); /* get offset of first instruction (addi) */ 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) { asm_cacheflush(addr, nbytes); } /* md_icacheflush ************************************************************** Calls the system's function to flush the instruction cache. *******************************************************************************/ void md_icacheflush(u1 *addr, s4 nbytes) { asm_cacheflush(addr, nbytes); } /* md_dcacheflush ************************************************************** Calls the system's function to flush the data cache. *******************************************************************************/ void md_dcacheflush(u1 *addr, s4 nbytes) { asm_cacheflush(addr, nbytes); } /* md_patch_replacement_point ************************************************** Patch the given replacement point. *******************************************************************************/ #if defined(ENABLE_REPLACEMENT) void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode) { s4 disp; u4 mcode; if (index < 0) { /* restore the patched-over instruction */ *(u4*)(rp->pc) = *(u4*)(savedmcode); } else { /* save the current machine code */ *(u4*)(savedmcode) = *(u4*)(rp->pc); /* build the machine code for the patch */ disp = ((u4*)code->replacementstubs - (u4*)rp->pc) + index * REPLACEMENT_STUB_SIZE - 1; mcode = (18 << 26) | ((((disp) * 4) + 4) & M_BMASK); /* write the new machine code */ *(u4*)(rp->pc) = (u4) mcode; } #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0 { u1* u1ptr = rp->pc; DISASSINSTR(u1ptr); fflush(stdout); } #endif /* flush instruction cache */ md_icacheflush(rp->pc,4); } #endif /* defined(ENABLE_REPLACEMENT) */ /* * 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: */