2001-05-20 20:31:50 +00:00
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/*
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* sigsegv.cpp - SIGSEGV signals support
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*
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* Derived from Bruno Haible's work on his SIGSEGV library for clisp
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* <http://clisp.sourceforge.net/>
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*
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* Basilisk II (C) 1997-2001 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <signal.h>
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#include "sigsegv.h"
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// Return value type of a signal handler (standard type if not defined)
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#ifndef RETSIGTYPE
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#define RETSIGTYPE void
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#endif
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// Type of the system signal handler
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typedef RETSIGTYPE (*signal_handler)(int);
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// User's SIGSEGV handler
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static sigsegv_handler_t sigsegv_user_handler = 0;
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// Actual SIGSEGV handler installer
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static bool sigsegv_do_install_handler(int sig);
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/*
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* OS-dependant SIGSEGV signals support section
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*/
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#if HAVE_SIGINFO_T
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// Generic extended signal handler
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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2001-07-07 09:12:15 +00:00
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, siginfo_t *sip, void *scp
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2001-05-20 20:31:50 +00:00
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#define SIGSEGV_FAULT_ADDRESS sip->si_addr
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2001-07-07 09:12:15 +00:00
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#if defined(__linux__)
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#if (defined(ia64) || defined(__ia64__))
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#define SIGSEGV_FAULT_INSTRUCTION (((struct sigcontext *)scp)->sc_ip & ~0x3ULL) /* slot number is in bits 0 and 1 */
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#endif
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#endif
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2001-05-20 20:31:50 +00:00
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#endif
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#if HAVE_SIGCONTEXT_SUBTERFUGE
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// Linux kernels prior to 2.4 ?
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#if defined(__linux__)
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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#if (defined(i386) || defined(__i386__))
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#include <asm/sigcontext.h>
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext scs
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#define SIGSEGV_FAULT_ADDRESS scs.cr2
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#define SIGSEGV_FAULT_INSTRUCTION scs.eip
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#endif
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#if (defined(sparc) || defined(__sparc__))
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#include <asm/sigcontext.h>
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2001-07-07 09:12:15 +00:00
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp, char *addr
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2001-05-20 20:31:50 +00:00
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#define SIGSEGV_FAULT_ADDRESS addr
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#endif
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#if (defined(powerpc) || defined(__powerpc__))
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#include <asm/sigcontext.h>
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2001-06-26 22:35:42 +00:00
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, struct sigcontext *scp
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2001-05-20 20:31:50 +00:00
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#define SIGSEGV_FAULT_ADDRESS scp->regs->dar
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#define SIGSEGV_FAULT_INSTRUCTION scp->regs->nip
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#endif
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2001-06-26 22:35:42 +00:00
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#if (defined(alpha) || defined(__alpha__))
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#include <asm/sigcontext.h>
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
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#define SIGSEGV_FAULT_INSTRUCTION scp->sc_pc
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// From Boehm's GC 6.0alpha8
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static sigsegv_address_t get_fault_address(struct sigcontext *scp)
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{
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unsigned int instruction = *((unsigned int *)(scp->sc_pc));
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unsigned long fault_address = scp->sc_regs[(instruction >> 16) & 0x1f];
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fault_address += (signed long)(signed short)(instruction & 0xffff);
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return (sigsegv_address_t)fault_address;
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}
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#endif
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2001-05-20 20:31:50 +00:00
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#endif
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// Irix 5 or 6 on MIPS
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#if (defined(sgi) || defined(__sgi)) && (defined(SYSTYPE_SVR4) || defined(__SYSTYPE_SVR4))
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS scp->sc_badvaddr
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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#endif
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// OSF/1 on Alpha
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#if defined(__osf__)
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS scp->sc_traparg_a0
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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#endif
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// AIX
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#if defined(_AIX)
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS scp->sc_jmpbuf.jmp_context.o_vaddr
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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#endif
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// NetBSD or FreeBSD
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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#if (defined(m68k) || defined(__m68k__))
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#include <m68k/frame.h>
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS ({ \
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struct sigstate { \
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int ss_flags; \
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struct frame ss_frame; \
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}; \
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struct sigstate *state = (struct sigstate *)scp->sc_ap; \
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char *fault_addr; \
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switch (state->ss_frame.f_format) { \
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case 7: /* 68040 access error */ \
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/* "code" is sometimes unreliable (i.e. contains NULL or a bogus address), reason unknown */ \
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fault_addr = state->ss_frame.f_fmt7.f_fa; \
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break; \
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default: \
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fault_addr = (char *)code; \
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break; \
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} \
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fault_addr; \
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})
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGSEGV)
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#else
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, void *scp, char *addr
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#define SIGSEGV_FAULT_ADDRESS addr
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
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#endif
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#endif
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2001-06-26 22:35:42 +00:00
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// MacOS X
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#if defined(__APPLE__) && defined(__MACH__)
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#if (defined(ppc) || defined(__ppc__))
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#define SIGSEGV_FAULT_HANDLER_ARGLIST int sig, int code, struct sigcontext *scp
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#define SIGSEGV_FAULT_ADDRESS get_fault_address(scp)
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#define SIGSEGV_FAULT_INSTRUCTION scp->sc_ir
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#define SIGSEGV_ALL_SIGNALS FAULT_HANDLER(SIGBUS)
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// From Boehm's GC 6.0alpha8
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#define EXTRACT_OP1(iw) (((iw) & 0xFC000000) >> 26)
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#define EXTRACT_OP2(iw) (((iw) & 0x000007FE) >> 1)
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#define EXTRACT_REGA(iw) (((iw) & 0x001F0000) >> 16)
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#define EXTRACT_REGB(iw) (((iw) & 0x03E00000) >> 21)
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#define EXTRACT_REGC(iw) (((iw) & 0x0000F800) >> 11)
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#define EXTRACT_DISP(iw) ((short *) &(iw))[1]
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static sigsegv_address_t get_fault_address(struct sigcontext *scp)
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{
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unsigned int instr = *((unsigned int *) scp->sc_ir);
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unsigned int * regs = &((unsigned int *) scp->sc_regs)[2];
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int disp = 0, tmp;
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unsigned int baseA = 0, baseB = 0;
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unsigned int addr, alignmask = 0xFFFFFFFF;
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switch(EXTRACT_OP1(instr)) {
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case 38: /* stb */
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case 39: /* stbu */
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case 54: /* stfd */
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case 55: /* stfdu */
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case 52: /* stfs */
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case 53: /* stfsu */
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case 44: /* sth */
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case 45: /* sthu */
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case 47: /* stmw */
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case 36: /* stw */
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case 37: /* stwu */
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tmp = EXTRACT_REGA(instr);
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if(tmp > 0)
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baseA = regs[tmp];
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disp = EXTRACT_DISP(instr);
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break;
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case 31:
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switch(EXTRACT_OP2(instr)) {
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case 86: /* dcbf */
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case 54: /* dcbst */
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case 1014: /* dcbz */
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case 247: /* stbux */
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case 215: /* stbx */
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case 759: /* stfdux */
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case 727: /* stfdx */
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case 983: /* stfiwx */
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case 695: /* stfsux */
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case 663: /* stfsx */
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case 918: /* sthbrx */
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case 439: /* sthux */
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case 407: /* sthx */
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case 661: /* stswx */
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case 662: /* stwbrx */
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case 150: /* stwcx. */
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case 183: /* stwux */
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case 151: /* stwx */
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case 135: /* stvebx */
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case 167: /* stvehx */
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case 199: /* stvewx */
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case 231: /* stvx */
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case 487: /* stvxl */
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tmp = EXTRACT_REGA(instr);
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if(tmp > 0)
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baseA = regs[tmp];
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baseB = regs[EXTRACT_REGC(instr)];
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/* determine Altivec alignment mask */
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switch(EXTRACT_OP2(instr)) {
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case 167: /* stvehx */
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alignmask = 0xFFFFFFFE;
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break;
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case 199: /* stvewx */
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alignmask = 0xFFFFFFFC;
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break;
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case 231: /* stvx */
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alignmask = 0xFFFFFFF0;
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break;
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case 487: /* stvxl */
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alignmask = 0xFFFFFFF0;
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break;
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}
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break;
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case 725: /* stswi */
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tmp = EXTRACT_REGA(instr);
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if(tmp > 0)
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baseA = regs[tmp];
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break;
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default: /* ignore instruction */
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return 0;
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break;
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}
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break;
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default: /* ignore instruction */
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return 0;
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break;
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}
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addr = (baseA + baseB) + disp;
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addr &= alignmask;
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return (sigsegv_address_t)addr;
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}
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#endif
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#endif
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2001-05-20 20:31:50 +00:00
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#endif
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// Fallbacks
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#ifndef SIGSEGV_FAULT_INSTRUCTION
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#define SIGSEGV_FAULT_INSTRUCTION SIGSEGV_INVALID_PC
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#endif
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2001-05-21 03:21:54 +00:00
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// SIGSEGV recovery supported ?
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#if defined(SIGSEGV_ALL_SIGNALS) && defined(SIGSEGV_FAULT_HANDLER_ARGLIST) && defined(SIGSEGV_FAULT_ADDRESS)
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#define HAVE_SIGSEGV_RECOVERY
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#endif
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2001-05-20 20:31:50 +00:00
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/*
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* SIGSEGV global handler
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*/
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2001-05-21 03:21:54 +00:00
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#ifdef HAVE_SIGSEGV_RECOVERY
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2001-05-20 20:31:50 +00:00
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static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
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{
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// Call user's handler and reinstall the global handler, if required
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if (sigsegv_user_handler((sigsegv_address_t)SIGSEGV_FAULT_ADDRESS, (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION)) {
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#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
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sigsegv_do_install_handler(sig);
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#endif
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}
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else {
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// FAIL: reinstall default handler for "safe" crash
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#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
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SIGSEGV_ALL_SIGNALS
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#undef FAULT_HANDLER
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}
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}
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2001-05-21 03:21:54 +00:00
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#endif
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2001-05-20 20:31:50 +00:00
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/*
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* SIGSEGV handler initialization
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*/
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#if defined(HAVE_SIGINFO_T)
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static bool sigsegv_do_install_handler(int sig)
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{
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// Setup SIGSEGV handler to process writes to frame buffer
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#ifdef HAVE_SIGACTION
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struct sigaction vosf_sa;
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sigemptyset(&vosf_sa.sa_mask);
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vosf_sa.sa_sigaction = sigsegv_handler;
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vosf_sa.sa_flags = SA_SIGINFO;
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return (sigaction(sig, &vosf_sa, 0) == 0);
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#else
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return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
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#endif
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}
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2001-05-21 03:21:54 +00:00
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#endif
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#if defined(HAVE_SIGCONTEXT_SUBTERFUGE)
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2001-05-20 20:31:50 +00:00
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static bool sigsegv_do_install_handler(int sig)
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{
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// Setup SIGSEGV handler to process writes to frame buffer
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#ifdef HAVE_SIGACTION
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struct sigaction vosf_sa;
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sigemptyset(&vosf_sa.sa_mask);
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vosf_sa.sa_handler = (signal_handler)sigsegv_handler;
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#if !EMULATED_68K && defined(__NetBSD__)
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sigaddset(&vosf_sa.sa_mask, SIGALRM);
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vosf_sa.sa_flags = SA_ONSTACK;
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#else
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vosf_sa.sa_flags = 0;
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#endif
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return (sigaction(sig, &vosf_sa, 0) == 0);
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#else
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return (signal(sig, (signal_handler)sigsegv_handler) != SIG_ERR);
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#endif
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}
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#endif
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bool sigsegv_install_handler(sigsegv_handler_t handler)
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{
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2001-05-21 03:21:54 +00:00
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#ifdef HAVE_SIGSEGV_RECOVERY
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2001-05-20 20:31:50 +00:00
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sigsegv_user_handler = handler;
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bool success = true;
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#define FAULT_HANDLER(sig) success = success && sigsegv_do_install_handler(sig);
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SIGSEGV_ALL_SIGNALS
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#undef FAULT_HANDLER
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return success;
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#else
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// FAIL: no siginfo_t nor sigcontext subterfuge is available
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return false;
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#endif
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}
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/*
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* SIGSEGV handler deinitialization
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*/
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void sigsegv_deinstall_handler(void)
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{
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2001-05-21 03:21:54 +00:00
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#ifdef HAVE_SIGSEGV_RECOVERY
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2001-05-20 20:31:50 +00:00
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sigsegv_user_handler = 0;
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#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
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SIGSEGV_ALL_SIGNALS
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#undef FAULT_HANDLER
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2001-05-21 03:21:54 +00:00
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#endif
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2001-05-20 20:31:50 +00:00
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}
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/*
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* Test program used for configure/test
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*/
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2001-06-26 22:35:42 +00:00
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#ifdef CONFIGURE_TEST_SIGSEGV_RECOVERY
|
2001-05-20 20:31:50 +00:00
|
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/mman.h>
|
2001-06-26 22:35:42 +00:00
|
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|
#include "vm_alloc.h"
|
2001-05-20 20:31:50 +00:00
|
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static int page_size;
|
2001-06-05 12:16:34 +00:00
|
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|
static volatile char * page = 0;
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|
|
static volatile int handler_called = 0;
|
2001-05-20 20:31:50 +00:00
|
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|
|
static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
|
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|
|
{
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|
|
handler_called++;
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|
|
if ((fault_address - 123) != page)
|
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|
|
exit(1);
|
2001-06-26 22:35:42 +00:00
|
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|
if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
|
2001-05-20 20:31:50 +00:00
|
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|
exit(1);
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|
|
return true;
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|
|
}
|
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|
|
|
int main(void)
|
|
|
|
{
|
2001-06-26 22:35:42 +00:00
|
|
|
if (vm_init() < 0)
|
2001-05-20 20:31:50 +00:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
page_size = getpagesize();
|
2001-06-26 22:35:42 +00:00
|
|
|
if ((page = (char *)vm_acquire(page_size)) == VM_MAP_FAILED)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (vm_protect((char *)page, page_size, VM_PAGE_READ) < 0)
|
2001-05-20 20:31:50 +00:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (!sigsegv_install_handler(sigsegv_test_handler))
|
|
|
|
return 1;
|
|
|
|
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|
|
page[123] = 45;
|
|
|
|
page[123] = 45;
|
|
|
|
|
|
|
|
if (handler_called != 1)
|
|
|
|
return 1;
|
|
|
|
|
2001-06-26 22:35:42 +00:00
|
|
|
vm_exit();
|
2001-05-20 20:31:50 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|