1 /* src/vm/jit/sparc64/linux/md-os.c - machine dependent SPARC Linux functions
3 Copyright (C) 1996-2005, 2006 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
25 $Id: md-os.c 7363 2007-02-15 14:57:04Z twisti $
37 #include "vm/jit/sparc64/codegen.h"
38 #include "vm/jit/sparc64/md-abi.h"
40 #include "vm/exceptions.h"
41 #include "vm/signallocal.h"
42 #include "vm/stringlocal.h"
43 #include "vm/jit/asmpart.h"
44 #include "vm/jit/stacktrace.h"
47 typedef struct sigcontext sigcontext;
49 ptrint md_get_reg_from_context(sigcontext *ctx, u4 rindex)
55 /* return 0 for REG_ZERO */
63 /* register is in global or out range, available in context */
65 val = ctx->sigc_regs.u_regs[rindex];
70 /* register is local or in, need to fetch from regsave area on stack */
72 window = ctx->sigc_regs.u_regs[REG_SP] + BIAS;
73 val = window[rindex - 16];
81 /* md_signal_handler_sigsegv ***************************************************
83 NullPointerException signal handler for hardware null pointer
86 *******************************************************************************/
88 void md_signal_handler_sigsegv(int sig, siginfo_t *info , void *_p)
106 java_objectheader *e;
108 ctx = (sigcontext *) info;
111 pv = (u1 *) md_get_reg_from_context(ctx, REG_PV_CALLEE);
112 sp = (u1 *) md_get_reg_from_context(ctx, REG_SP);
113 ra = (u1 *) md_get_reg_from_context(ctx, REG_RA_CALLEE); /* this is correct for leafs */
114 xpc = (u1 *) ctx->sigc_regs.tpc;
116 /* get exception-throwing instruction */
118 mcode = *((u4 *) xpc);
120 d = M_OP3_GET_RD(mcode);
121 s1 = M_OP3_GET_RS(mcode);
122 disp = M_OP3_GET_IMM(mcode);
124 /* flush register windows? */
126 val = md_get_reg_from_context(ctx, d);
128 /* check for special-load */
130 if (s1 == REG_ZERO) {
131 /* we use the exception type as load displacement */
136 /* This is a normal NPE: addr must be NULL and the NPE-type
139 addr = md_get_reg_from_context(ctx, s1);
144 e = exceptions_new_hardware_exception(pv, sp, ra, xpc, type, val);
148 ctx->sigc_regs.u_regs[REG_ITMP2_XPTR] = (ptrint) e;
149 ctx->sigc_regs.u_regs[REG_ITMP3_XPC] = (ptrint) xpc;
150 ctx->sigc_regs.tpc = (ptrint) asm_handle_exception;
151 ctx->sigc_regs.tnpc = (ptrint) asm_handle_exception + 4;
155 #if defined(USE_THREADS) && defined(NATIVE_THREADS)
156 void thread_restartcriticalsection(ucontext_t *_uc)
161 _mc = &_uc->uc_mcontext;
163 critical = thread_checkcritical((void *) _mc->sc_pc);
166 _mc->sc_pc = (ptrint) critical;
171 /* md_icacheflush **************************************************************
173 Calls the system's function to flush the instruction cache.
175 *******************************************************************************/
177 void md_icacheflush(u1 *addr, s4 nbytes)
183 /* zero the least significant 3 bits to align on a 64-bit boundary */
184 addr = (u1 *) (((ptrint) addr) & -8l);
200 * These are local overrides for various environment variables in Emacs.
201 * Please do not remove this and leave it at the end of the file, where
202 * Emacs will automagically detect them.
203 * ---------------------------------------------------------------------
206 * indent-tabs-mode: t
210 * vim:noexpandtab:sw=4:ts=4: