/* src/vm/jit/alpha/md.c - machine dependent Alpha 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. */ #include "config.h" #include #include #if defined(__LINUX__) # include extern unsigned long ieee_get_fp_control(); extern void ieee_set_fp_control(unsigned long fp_control); #endif #include "vm/types.h" #include "vm/jit/alpha/md-abi.h" #include "vm/exceptions.h" #include "vm/stringlocal.h" #include "vm/jit/asmpart.h" #include "vm/jit/stacktrace.h" #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) #include "vmcore/options.h" /* XXX debug */ #include "vm/jit/disass.h" /* XXX debug */ #endif /* global variables ***********************************************************/ bool has_ext_instr_set = false; /* has instruction set extensions */ /* md_init ********************************************************************* Do some machine dependent initialization. *******************************************************************************/ void md_init(void) { /* check for extended instruction set */ has_ext_instr_set = !asm_md_init(); #if defined(__LINUX__) /* Linux on Digital Alpha needs an initialisation of the ieee floating point control for IEEE compliant arithmetic (option -mieee of GCC). Under Digital Unix this is done automatically. */ /* initialize floating point control */ ieee_set_fp_control(ieee_get_fp_control() & ~IEEE_TRAP_ENABLE_INV & ~IEEE_TRAP_ENABLE_DZE /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */ & ~IEEE_TRAP_ENABLE_OVF); #endif } /* 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 Alpha the return address is located on the top of the stackframe */ 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: a77bffb8 ldq pv,-72(pv) 6b5b4000 jsr (pv) INVOKEVIRTUAL: a7900000 ldq at,0(a0) a77c0000 ldq pv,0(at) 6b5b4000 jsr (pv) INVOKEINTERFACE: a7900000 ldq at,0(a0) a79cff98 ldq at,-104(at) a77c0018 ldq pv,24(at) 6b5b4000 jsr (pv) *******************************************************************************/ u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr) { u4 mcode; s4 offset; u1 *pa; /* patch address */ /* go back to the actual load instruction (2 instructions on Alpha) */ ra = ra - 2 * 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 (ldq) */ mcode = *((u4 *) ra); /* get the offset from the instruction */ offset = (s2) (mcode & 0x0000ffff); /* check for call with REG_METHODPTR: ldq pv,0(at) */ if ((mcode >> 16) == 0xa77c) { /* 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 { /* in the normal case we check for a `ldq pv,-72(pv)' instruction */ assert((mcode >> 16) == 0xa77b); /* and get the final data segment address */ pa = sfi->pv + offset; } } return pa; } /* md_codegen_get_pv_from_pc *************************************************** Machine code: 6b5b4000 jsr (pv) 277afffe ldah pv,-2(ra) 237ba61c lda pv,-23012(pv) *******************************************************************************/ u1 *md_codegen_get_pv_from_pc(u1 *ra) { u1 *pv; u4 mcode; s4 offset; pv = ra; /* get first instruction word after jump */ mcode = *((u4 *) ra); /* check if we have 2 instructions (ldah, lda) */ if ((mcode >> 16) == 0x277a) { /* get displacement of first instruction (ldah) */ offset = (s4) (mcode << 16); pv += offset; /* get displacement of second instruction (lda) */ mcode = *((u4 *) (ra + 1 * 4)); assert((mcode >> 16) == 0x237b); offset = (s2) (mcode & 0x0000ffff); pv += offset; } else { /* get displacement of first instruction (lda) */ assert((mcode >> 16) == 0x237a); offset = (s2) (mcode & 0x0000ffff); pv += 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_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) { 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 */ mcode = (0xa41f0000 | (EXCEPTION_HARDWARE_PATCHER)); /* write the new machine code */ *(u4*)(rp->pc) = 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: */