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/* Fault handler information subroutine. NetBSD/Alpha version.
* Taken from gcc-3.3/boehm-gc/os_dep.c.
*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
* Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
/* Decodes the machine instruction which was responsible for the sending of the
SIGBUS signal. Luckily this is much easier than, say, on the PowerPC. */
static void *
get_fault_addr (struct sigcontext *scp)
{
unsigned int instr = *((unsigned int *)(scp->sc_pc));
unsigned long faultaddr;
/* Instructions which access memory have operands of the form ARG_MEM or
ARG_FMEM, consisting of
- a base register specification (PRB) in bits 20..16,
- a memory displacement (MDISP) in bits 15..0,
- an general register specification (RA) or a floating-point register
specification (FA) in bits 25..21.
See binutils-2.13.90.0.16/opcodes/alpha-opc.c. */
faultaddr = scp->sc_regs[(instr >> 16) & 0x1f];
faultaddr += (unsigned long) (long) (((int)instr << 16) >> 16);
return (void *) faultaddr;
}
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