1 /* src/vm/jit/alpha/md.c - machine dependent Alpha functions
3 Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
4 C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5 E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6 J. Wenninger, Institut f. Computersprachen - TU Wien
8 This file is part of CACAO.
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License as
12 published by the Free Software Foundation; either version 2, or (at
13 your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
33 #if defined(__LINUX__)
36 extern unsigned long ieee_get_fp_control();
37 extern void ieee_set_fp_control(unsigned long fp_control);
42 #include "vm/jit/alpha/md-abi.h"
44 #include "vm/exceptions.h"
45 #include "vm/stringlocal.h"
47 #include "vm/jit/asmpart.h"
48 #include "vm/jit/stacktrace.h"
50 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER)
51 #include "vmcore/options.h" /* XXX debug */
52 #include "vm/jit/disass.h" /* XXX debug */
56 /* global variables ***********************************************************/
58 bool has_ext_instr_set = false; /* has instruction set extensions */
61 /* md_init *********************************************************************
63 Do some machine dependent initialization.
65 *******************************************************************************/
69 /* check for extended instruction set */
71 has_ext_instr_set = !asm_md_init();
73 #if defined(__LINUX__)
74 /* Linux on Digital Alpha needs an initialisation of the ieee
75 floating point control for IEEE compliant arithmetic (option
76 -mieee of GCC). Under Digital Unix this is done
79 /* initialize floating point control */
81 ieee_set_fp_control(ieee_get_fp_control()
82 & ~IEEE_TRAP_ENABLE_INV
83 & ~IEEE_TRAP_ENABLE_DZE
84 /* & ~IEEE_TRAP_ENABLE_UNF we dont want underflow */
85 & ~IEEE_TRAP_ENABLE_OVF);
90 /* md_stacktrace_get_returnaddress *********************************************
92 Returns the return address of the current stackframe, specified by
93 the passed stack pointer and the stack frame size.
95 *******************************************************************************/
97 u1 *md_stacktrace_get_returnaddress(u1 *sp, u4 framesize)
101 /* on Alpha the return address is located on the top of the stackframe */
103 ra = *((u1 **) (sp + framesize - SIZEOF_VOID_P));
109 /* md_get_method_patch_address *************************************************
111 Gets the patch address of the currently compiled method. The offset
112 is extracted from the load instruction(s) before the jump and added
113 to the right base address (PV or REG_METHODPTR).
115 INVOKESTATIC/SPECIAL:
117 a77bffb8 ldq pv,-72(pv)
122 a7900000 ldq at,0(a0)
123 a77c0000 ldq pv,0(at)
128 a7900000 ldq at,0(a0)
129 a79cff98 ldq at,-104(at)
130 a77c0018 ldq pv,24(at)
133 *******************************************************************************/
135 u1 *md_get_method_patch_address(u1 *ra, stackframeinfo *sfi, u1 *mptr)
139 u1 *pa; /* patch address */
141 /* go back to the actual load instruction (2 instructions on Alpha) */
145 /* get first instruction word on current PC */
147 mcode = *((u4 *) ra);
149 /* check if we have 2 instructions (lui) */
151 if ((mcode >> 16) == 0x3c19) {
152 /* XXX write a regression for this */
155 /* get displacement of first instruction (lui) */
157 offset = (s4) (mcode << 16);
159 /* get displacement of second instruction (daddiu) */
161 mcode = *((u4 *) (ra + 1 * 4));
163 assert((mcode >> 16) == 0x6739);
165 offset += (s2) (mcode & 0x0000ffff);
168 /* get first instruction (ldq) */
170 mcode = *((u4 *) ra);
172 /* get the offset from the instruction */
174 offset = (s2) (mcode & 0x0000ffff);
176 /* check for call with REG_METHODPTR: ldq pv,0(at) */
178 if ((mcode >> 16) == 0xa77c) {
179 /* in this case we use the passed method pointer */
181 /* return NULL if no mptr was specified (used for replacement) */
189 /* in the normal case we check for a `ldq pv,-72(pv)' instruction */
191 assert((mcode >> 16) == 0xa77b);
193 /* and get the final data segment address */
195 pa = sfi->pv + offset;
203 /* md_codegen_get_pv_from_pc ***************************************************
208 277afffe ldah pv,-2(ra)
209 237ba61c lda pv,-23012(pv)
211 *******************************************************************************/
213 u1 *md_codegen_get_pv_from_pc(u1 *ra)
221 /* get first instruction word after jump */
223 mcode = *((u4 *) ra);
225 /* check if we have 2 instructions (ldah, lda) */
227 if ((mcode >> 16) == 0x277a) {
228 /* get displacement of first instruction (ldah) */
230 offset = (s4) (mcode << 16);
233 /* get displacement of second instruction (lda) */
235 mcode = *((u4 *) (ra + 1 * 4));
237 assert((mcode >> 16) == 0x237b);
239 offset = (s2) (mcode & 0x0000ffff);
243 /* get displacement of first instruction (lda) */
245 assert((mcode >> 16) == 0x237a);
247 offset = (s2) (mcode & 0x0000ffff);
255 /* md_cacheflush ***************************************************************
257 Calls the system's function to flush the instruction and data
260 *******************************************************************************/
262 void md_cacheflush(u1 *addr, s4 nbytes)
264 asm_cacheflush(addr, nbytes);
268 /* md_icacheflush **************************************************************
270 Calls the system's function to flush the instruction cache.
272 *******************************************************************************/
274 void md_icacheflush(u1 *addr, s4 nbytes)
276 asm_cacheflush(addr, nbytes);
280 /* md_patch_replacement_point **************************************************
282 Patch the given replacement point.
284 *******************************************************************************/
286 #if defined(ENABLE_REPLACEMENT)
287 void md_patch_replacement_point(codeinfo *code, s4 index, rplpoint *rp, u1 *savedmcode)
292 /* restore the patched-over instruction */
293 *(u4*)(rp->pc) = *(u4*)(savedmcode);
296 /* save the current machine code */
297 *(u4*)(savedmcode) = *(u4*)(rp->pc);
299 /* build the machine code for the patch */
300 mcode = (0xa41f0000 | (EXCEPTION_HARDWARE_PATCHER));
302 /* write the new machine code */
303 *(u4*)(rp->pc) = mcode;
306 #if !defined(NDEBUG) && defined(ENABLE_DISASSEMBLER) && 0
314 /* flush instruction cache */
315 md_icacheflush(rp->pc,4);
317 #endif /* defined(ENABLE_REPLACEMENT) */
321 * These are local overrides for various environment variables in Emacs.
322 * Please do not remove this and leave it at the end of the file, where
323 * Emacs will automagically detect them.
324 * ---------------------------------------------------------------------
327 * indent-tabs-mode: t
331 * vim:noexpandtab:sw=4:ts=4: