1 /* src/vm/jit/m68k/linux/md-os.c - linux specific 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 #include "vm/exceptions.h"
34 #include "vm/jit/asmpart.h"
35 #include "vm/signallocal.h"
39 /*#include <signal.h>*/
41 #include <sys/ucontext.h> /* has br0ken ucontext_t*/
44 * The glibc bundeled with my devels system ucontext.h differs with kernels ucontext.h. Not good.
45 * The following stuff is taken from 2.6.10 + freescale coldfire patches:
47 typedef struct actual_fpregset {
52 typedef struct actual_mcontext {
54 gregset_t gregs; /* 0...7 = %d0-%d7, 8...15 = %a0-%a7 */
55 actual_fpregset_t fpregs;
58 #define GREGS_ADRREG_OFF 8
60 typedef struct actual_ucontext {
61 unsigned long uc_flags;
62 struct actual_ucontext *uc_link;
64 struct actual_mcontext uc_mcontext;
65 unsigned long uc_filler[80];
66 sigset_t uc_sigmask; /* mask last for extensibility */
71 * linux specific initializations
77 act.sa_sigaction = md_signal_handler_sigill;
78 act.sa_flags = SA_NODEFER | SA_SIGINFO;
80 if (sigaction(SIGILL, &act, NULL) == -1) {
81 vm_abort("md_linux_init: Error registering signal handler");
85 /* md_signal_handler_sigsegv ******************************************
87 * Invoked when a Nullpointerexception occured, or when the vm
88 * crashes, hard to tell the difference.
89 **********************************************************************/
90 void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
94 uint32_t val, regval, off;
97 actual_mcontext_t *_mc;
98 actual_ucontext_t *_uc;
101 _uc = (actual_ucontext_t*)_p;
102 _mc = &_uc->uc_mcontext;
103 sp = _mc->gregs[R_SP];
104 xpc = _mc->gregs[R_PC];
105 opc = *(uint16_t*)xpc;
107 /* m68k uses a whole bunch of difficult to differ load instructions where null pointer check could occure */
108 /* the first two are 2*32bit sized */
111 if ((opc & ((2<<12) | (5<<3))) == ((2<<12) | (5<<3))) {
112 if (opc & (1<<6)) adrreg = true; /* M_XLD */
114 off = *(uint16_t*)(xpc+1);
115 } else if ((opc & ((2<<12) | (5<<6))) == ((2<<12) | (5<<6))) {
116 if (opc & (1<<3)) adrreg = true; /* M_XST */
117 val = (opc >> 9) & 0x0007;
118 off = *(uint16_t*)(xpc+1);
121 /*fprintf(stderr, "SEGV: short instructions %x\n", opc);
123 /* now check the 32 bit sized instructions */
124 if ((opc & (2<<3)) == (2<<3)) {
125 if (opc & (1<<6)) adrreg = true; /* M_L*X */
127 } else if ((opc & (2<<6)) == (2<<6)) {
128 if (opc & (1<<3)) adrreg = true; /* M_S*X */
129 val = (opc >> 9) & 0x0007;
131 vm_abort("md_signal_handler_sigsegv: unhandeled faulting opcode %x", opc);
135 /* val is now register number, adreg == true if it is an address regsiter */
136 regval = _mc->gregs[adrreg ? GREGS_ADRREG_OFF + val : val];
139 vm_abort("md_signal_handler_sigsegv: faulting address is not NULL: addr=%p", regval);
143 /*fprintf(stderr, "SEGV: sp=%x, xpc=%x, regval=%x\n", sp, xpc, regval);
146 /* Handle the type. */
148 p = signal_handle(EXCEPTION_HARDWARE_NULLPOINTER, regval, NULL, (void*)sp, (void*)xpc, (void*)xpc, _p);
150 _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (intptr_t) p;
151 _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (intptr_t) xpc;
152 _mc->gregs[R_PC] = (intptr_t) asm_handle_exception;
155 /* md_signal_handler_sigill *******************************************
157 * This handler is used to generate hardware exceptions.
158 * Type of exception derived from trap number.
159 * If an object is needed a tst instruction (2 byte long) has
160 * been created directly before the trap instruction (2 bytes long).
161 * the last 3 bit of this tst instruction contain the register number.
162 **********************************************************************/
163 void md_signal_handler_sigill(int sig, siginfo_t *siginfo, void *_p)
168 uint32_t val, regval;
170 actual_mcontext_t *_mc;
171 actual_ucontext_t *_uc;
173 _uc = (actual_ucontext_t*)_p;
174 xpc = (uint32_t)siginfo->si_addr;
176 if (siginfo->si_code == ILL_ILLOPC) {
177 vm_abort("md_signal_handler_sigill: the illegal instruction @ 0x%x, aborting", xpc);
179 if (siginfo->si_code != ILL_ILLTRP) {
180 vm_abort("md_signal_handler_sigill: Caught something not a trap");
183 opc = *(uint16_t*)(xpc-2);
185 assert( (opc&0xfff0) == 0x4e40 );
186 type = opc & 0x000f; /* filter trap number */
188 _mc = &_uc->uc_mcontext;
189 sp = _mc->gregs[R_SP];
191 /* Figure out in which register the object causing the exception resides for appropiate exceptions
194 case EXCEPTION_HARDWARE_ARITHMETIC:
195 case EXCEPTION_HARDWARE_EXCEPTION:
198 case EXCEPTION_HARDWARE_CLASSCAST:
199 regval = *(uint16_t*)(xpc-4);
200 assert( (regval&0xfff0) == 0x4a00 );
201 /* was in a address register */
202 regval = _mc->gregs[ GREGS_ADRREG_OFF + (regval & 0x7) ];
204 case EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS:
205 regval = *(uint16_t*)(xpc-4);
206 assert( (regval&0xfff0) == 0x4a00 );
207 /* was a data register */
208 regval = _mc->gregs[regval & 0x7];
210 case M68K_EXCEPTION_HARDWARE_NULLPOINTER:
211 type = EXCEPTION_HARDWARE_NULLPOINTER;
217 /*fprintf(stderr, "NEW HWE: sp=%x, xpc=%x, tpye=%x, regval=%x\n", sp, xpc, type, regval);
220 /* Handle the type. */
222 p = signal_handle(type, val, NULL, (void*)sp, (void*)xpc, (void*)xpc, _p);
224 _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP1] = (intptr_t) p;
225 _mc->gregs[GREGS_ADRREG_OFF + REG_ATMP2_XPC] = (intptr_t) xpc;
226 _mc->gregs[R_PC] = (intptr_t) asm_handle_exception;
229 /* md_signal_handler_sigusr1 ***************************************************
231 Signal handler for suspending threads.
233 *******************************************************************************/
235 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
236 void md_signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
243 _uc = (ucontext_t *) _p;
244 _mc = &_uc->uc_mcontext;
246 /* get the PC and SP for this thread */
247 pc = (u1 *) _mc->gregs[R_PC];
248 sp = (u1 *) _mc->gregs[R_SP];
250 /* now suspend the current thread */
251 threads_suspend_ack(pc, sp);
257 * These are local overrides for various environment variables in Emacs.
258 * Please do not remove this and leave it at the end of the file, where
259 * Emacs will automagically detect them.
260 * ---------------------------------------------------------------------
263 * indent-tabs-mode: t
267 * vim:noexpandtab:sw=4:ts=4: