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645 lines
16 KiB
C
645 lines
16 KiB
C
/* Functions specific to running gdb native on IA-64 running
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GNU/Linux.
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Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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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,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include <signal.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include <sys/user.h>
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#include <asm/ptrace_offsets.h>
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#include <sys/procfs.h>
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* These must match the order of the register names.
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Some sort of lookup table is needed because the offsets associated
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with the registers are all over the board. */
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static int u_offsets[] =
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{
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/* general registers */
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-1, /* gr0 not available; i.e, it's always zero */
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PT_R1,
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PT_R2,
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PT_R3,
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PT_R4,
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PT_R5,
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PT_R6,
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PT_R7,
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PT_R8,
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PT_R9,
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PT_R10,
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PT_R11,
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PT_R12,
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PT_R13,
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PT_R14,
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PT_R15,
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PT_R16,
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PT_R17,
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PT_R18,
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PT_R19,
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PT_R20,
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PT_R21,
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PT_R22,
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PT_R23,
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PT_R24,
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PT_R25,
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PT_R26,
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PT_R27,
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PT_R28,
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PT_R29,
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PT_R30,
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PT_R31,
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/* gr32 through gr127 not directly available via the ptrace interface */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* Floating point registers */
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-1, -1, /* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
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PT_F2,
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PT_F3,
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PT_F4,
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PT_F5,
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PT_F6,
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PT_F7,
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PT_F8,
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PT_F9,
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PT_F10,
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PT_F11,
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PT_F12,
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PT_F13,
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PT_F14,
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PT_F15,
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PT_F16,
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PT_F17,
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PT_F18,
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PT_F19,
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PT_F20,
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PT_F21,
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PT_F22,
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PT_F23,
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PT_F24,
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PT_F25,
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PT_F26,
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PT_F27,
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PT_F28,
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PT_F29,
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PT_F30,
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PT_F31,
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PT_F32,
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PT_F33,
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PT_F34,
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PT_F35,
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PT_F36,
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PT_F37,
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PT_F38,
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PT_F39,
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PT_F40,
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PT_F41,
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PT_F42,
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PT_F43,
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PT_F44,
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PT_F45,
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PT_F46,
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PT_F47,
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PT_F48,
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PT_F49,
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PT_F50,
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PT_F51,
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PT_F52,
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PT_F53,
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PT_F54,
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PT_F55,
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PT_F56,
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PT_F57,
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PT_F58,
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PT_F59,
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PT_F60,
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PT_F61,
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PT_F62,
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PT_F63,
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PT_F64,
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PT_F65,
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PT_F66,
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PT_F67,
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PT_F68,
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PT_F69,
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PT_F70,
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PT_F71,
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PT_F72,
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PT_F73,
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PT_F74,
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PT_F75,
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PT_F76,
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PT_F77,
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PT_F78,
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PT_F79,
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PT_F80,
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PT_F81,
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PT_F82,
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PT_F83,
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PT_F84,
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PT_F85,
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PT_F86,
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PT_F87,
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PT_F88,
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PT_F89,
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PT_F90,
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PT_F91,
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PT_F92,
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PT_F93,
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PT_F94,
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PT_F95,
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PT_F96,
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PT_F97,
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PT_F98,
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PT_F99,
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PT_F100,
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PT_F101,
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PT_F102,
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PT_F103,
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PT_F104,
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PT_F105,
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PT_F106,
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PT_F107,
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PT_F108,
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PT_F109,
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PT_F110,
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PT_F111,
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PT_F112,
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PT_F113,
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PT_F114,
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PT_F115,
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PT_F116,
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PT_F117,
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PT_F118,
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PT_F119,
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PT_F120,
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PT_F121,
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PT_F122,
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PT_F123,
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PT_F124,
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PT_F125,
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PT_F126,
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PT_F127,
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/* predicate registers - we don't fetch these individually */
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* branch registers */
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PT_B0,
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PT_B1,
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PT_B2,
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PT_B3,
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PT_B4,
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PT_B5,
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PT_B6,
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PT_B7,
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/* virtual frame pointer and virtual return address pointer */
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-1, -1,
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/* other registers */
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PT_PR,
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PT_CR_IIP, /* ip */
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PT_CR_IPSR, /* psr */
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PT_CFM, /* cfm */
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/* kernel registers not visible via ptrace interface (?) */
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* hole */
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-1, -1, -1, -1, -1, -1, -1, -1,
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PT_AR_RSC,
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PT_AR_BSP,
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PT_AR_BSPSTORE,
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PT_AR_RNAT,
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-1,
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-1, /* Not available: FCR, IA32 floating control register */
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-1, -1,
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-1, /* Not available: EFLAG */
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-1, /* Not available: CSD */
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-1, /* Not available: SSD */
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-1, /* Not available: CFLG */
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-1, /* Not available: FSR */
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-1, /* Not available: FIR */
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-1, /* Not available: FDR */
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-1,
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PT_AR_CCV,
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-1, -1, -1,
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PT_AR_UNAT,
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-1, -1, -1,
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PT_AR_FPSR,
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-1, -1, -1,
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-1, /* Not available: ITC */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1,
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PT_AR_PFS,
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PT_AR_LC,
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-1, /* Not available: EC, the Epilog Count register */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1,
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/* nat bits - not fetched directly; instead we obtain these bits from
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either rnat or unat or from memory. */
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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};
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CORE_ADDR
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register_addr (int regno, CORE_ADDR blockend)
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{
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CORE_ADDR addr;
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if (regno < 0 || regno >= NUM_REGS)
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error ("Invalid register number %d.", regno);
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if (u_offsets[regno] == -1)
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addr = 0;
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else
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addr = (CORE_ADDR) u_offsets[regno];
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return addr;
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}
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int ia64_cannot_fetch_register (regno)
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int regno;
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{
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return regno < 0 || regno >= NUM_REGS || u_offsets[regno] == -1;
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}
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int ia64_cannot_store_register (regno)
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int regno;
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{
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/* Rationale behind not permitting stores to bspstore...
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The IA-64 architecture provides bspstore and bsp which refer
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memory locations in the RSE's backing store. bspstore is the
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next location which will be written when the RSE needs to write
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to memory. bsp is the address at which r32 in the current frame
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would be found if it were written to the backing store.
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The IA-64 architecture provides read-only access to bsp and
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read/write access to bspstore (but only when the RSE is in
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the enforced lazy mode). It should be noted that stores
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to bspstore also affect the value of bsp. Changing bspstore
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does not affect the number of dirty entries between bspstore
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and bsp, so changing bspstore by N words will also cause bsp
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to be changed by (roughly) N as well. (It could be N-1 or N+1
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depending upon where the NaT collection bits fall.)
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OTOH, the Linux kernel provides read/write access to bsp (and
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currently read/write access to bspstore as well). But it
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is definitely the case that if you change one, the other
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will change at the same time. It is more useful to gdb to
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be able to change bsp. So in order to prevent strange and
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undesirable things from happening when a dummy stack frame
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is popped (after calling an inferior function), we allow
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bspstore to be read, but not written. (Note that popping
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a (generic) dummy stack frame causes all registers that
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were previously read from the inferior process to be written
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back.) */
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return regno < 0 || regno >= NUM_REGS || u_offsets[regno] == -1
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|| regno == IA64_BSPSTORE_REGNUM;
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}
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void
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supply_gregset (gregset_t *gregsetp)
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{
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int regi;
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greg_t *regp = (greg_t *) gregsetp;
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for (regi = IA64_GR0_REGNUM; regi <= IA64_GR31_REGNUM; regi++)
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{
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supply_register (regi, (char *) (regp + (regi - IA64_GR0_REGNUM)));
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}
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/* FIXME: NAT collection bits are at index 32; gotta deal with these
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somehow... */
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supply_register (IA64_PR_REGNUM, (char *) (regp + 33));
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for (regi = IA64_BR0_REGNUM; regi <= IA64_BR7_REGNUM; regi++)
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{
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supply_register (regi, (char *) (regp + 34 + (regi - IA64_BR0_REGNUM)));
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}
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supply_register (IA64_IP_REGNUM, (char *) (regp + 42));
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supply_register (IA64_CFM_REGNUM, (char *) (regp + 43));
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supply_register (IA64_PSR_REGNUM, (char *) (regp + 44));
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supply_register (IA64_RSC_REGNUM, (char *) (regp + 45));
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supply_register (IA64_BSP_REGNUM, (char *) (regp + 46));
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supply_register (IA64_BSPSTORE_REGNUM, (char *) (regp + 47));
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supply_register (IA64_RNAT_REGNUM, (char *) (regp + 48));
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supply_register (IA64_CCV_REGNUM, (char *) (regp + 49));
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supply_register (IA64_UNAT_REGNUM, (char *) (regp + 50));
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supply_register (IA64_FPSR_REGNUM, (char *) (regp + 51));
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supply_register (IA64_PFS_REGNUM, (char *) (regp + 52));
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supply_register (IA64_LC_REGNUM, (char *) (regp + 53));
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supply_register (IA64_EC_REGNUM, (char *) (regp + 54));
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}
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void
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fill_gregset (gregset_t *gregsetp, int regno)
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{
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int regi;
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greg_t *regp = (greg_t *) gregsetp;
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#define COPY_REG(_idx_,_regi_) \
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if ((regno == -1) || regno == _regi_) \
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memcpy (regp + _idx_, ®isters[REGISTER_BYTE (_regi_)], \
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REGISTER_RAW_SIZE (_regi_))
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for (regi = IA64_GR0_REGNUM; regi <= IA64_GR31_REGNUM; regi++)
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{
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COPY_REG (regi - IA64_GR0_REGNUM, regi);
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}
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/* FIXME: NAT collection bits at index 32? */
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COPY_REG (33, IA64_PR_REGNUM);
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for (regi = IA64_BR0_REGNUM; regi <= IA64_BR7_REGNUM; regi++)
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{
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COPY_REG (34 + (regi - IA64_BR0_REGNUM), regi);
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}
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COPY_REG (42, IA64_IP_REGNUM);
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COPY_REG (43, IA64_CFM_REGNUM);
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COPY_REG (44, IA64_PSR_REGNUM);
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COPY_REG (45, IA64_RSC_REGNUM);
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COPY_REG (46, IA64_BSP_REGNUM);
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COPY_REG (47, IA64_BSPSTORE_REGNUM);
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COPY_REG (48, IA64_RNAT_REGNUM);
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COPY_REG (49, IA64_CCV_REGNUM);
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COPY_REG (50, IA64_UNAT_REGNUM);
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COPY_REG (51, IA64_FPSR_REGNUM);
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COPY_REG (52, IA64_PFS_REGNUM);
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COPY_REG (53, IA64_LC_REGNUM);
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COPY_REG (54, IA64_EC_REGNUM);
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}
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/* Given a pointer to a floating point register set in /proc format
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(fpregset_t *), unpack the register contents and supply them as gdb's
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idea of the current floating point register values. */
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void
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supply_fpregset (fpregset_t *fpregsetp)
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{
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register int regi;
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char *from;
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for (regi = IA64_FR0_REGNUM; regi <= IA64_FR127_REGNUM; regi++)
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{
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from = (char *) &((*fpregsetp)[regi - IA64_FR0_REGNUM]);
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supply_register (regi, from);
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}
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}
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/* Given a pointer to a floating point register set in /proc format
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(fpregset_t *), update the register specified by REGNO from gdb's idea
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of the current floating point register set. If REGNO is -1, update
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them all. */
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void
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fill_fpregset (fpregset_t *fpregsetp, int regno)
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{
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int regi;
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char *to;
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char *from;
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for (regi = IA64_FR0_REGNUM; regi <= IA64_FR127_REGNUM; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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from = (char *) ®isters[REGISTER_BYTE (regi)];
|
|
to = (char *) &((*fpregsetp)[regi - IA64_FR0_REGNUM]);
|
|
memcpy (to, from, REGISTER_RAW_SIZE (regi));
|
|
}
|
|
}
|
|
}
|
|
|
|
#define IA64_PSR_DB (1UL << 24)
|
|
#define IA64_PSR_DD (1UL << 39)
|
|
|
|
static void
|
|
enable_watchpoints_in_psr (ptid_t ptid)
|
|
{
|
|
CORE_ADDR psr;
|
|
|
|
psr = read_register_pid (IA64_PSR_REGNUM, ptid);
|
|
if (!(psr & IA64_PSR_DB))
|
|
{
|
|
psr |= IA64_PSR_DB; /* Set the db bit - this enables hardware
|
|
watchpoints and breakpoints. */
|
|
write_register_pid (IA64_PSR_REGNUM, psr, ptid);
|
|
}
|
|
}
|
|
|
|
static long
|
|
fetch_debug_register (ptid_t ptid, int idx)
|
|
{
|
|
long val;
|
|
int tid;
|
|
|
|
tid = TIDGET (ptid);
|
|
if (tid == 0)
|
|
tid = PIDGET (ptid);
|
|
|
|
val = ptrace (PT_READ_U, tid, (PTRACE_ARG3_TYPE) (PT_DBR + 8 * idx), 0);
|
|
|
|
return val;
|
|
}
|
|
|
|
static void
|
|
store_debug_register (ptid_t ptid, int idx, long val)
|
|
{
|
|
int tid;
|
|
|
|
tid = TIDGET (ptid);
|
|
if (tid == 0)
|
|
tid = PIDGET (ptid);
|
|
|
|
(void) ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) (PT_DBR + 8 * idx), val);
|
|
}
|
|
|
|
static void
|
|
fetch_debug_register_pair (ptid_t ptid, int idx, long *dbr_addr, long *dbr_mask)
|
|
{
|
|
if (dbr_addr)
|
|
*dbr_addr = fetch_debug_register (ptid, 2 * idx);
|
|
if (dbr_mask)
|
|
*dbr_mask = fetch_debug_register (ptid, 2 * idx + 1);
|
|
}
|
|
|
|
static void
|
|
store_debug_register_pair (ptid_t ptid, int idx, long *dbr_addr, long *dbr_mask)
|
|
{
|
|
if (dbr_addr)
|
|
store_debug_register (ptid, 2 * idx, *dbr_addr);
|
|
if (dbr_mask)
|
|
store_debug_register (ptid, 2 * idx + 1, *dbr_mask);
|
|
}
|
|
|
|
static int
|
|
is_power_of_2 (int val)
|
|
{
|
|
int i, onecount;
|
|
|
|
onecount = 0;
|
|
for (i = 0; i < 8 * sizeof (val); i++)
|
|
if (val & (1 << i))
|
|
onecount++;
|
|
|
|
return onecount <= 1;
|
|
}
|
|
|
|
int
|
|
ia64_linux_insert_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int rw)
|
|
{
|
|
int idx;
|
|
long dbr_addr, dbr_mask;
|
|
int max_watchpoints = 4;
|
|
|
|
if (len <= 0 || !is_power_of_2 (len))
|
|
return -1;
|
|
|
|
for (idx = 0; idx < max_watchpoints; idx++)
|
|
{
|
|
fetch_debug_register_pair (ptid, idx, NULL, &dbr_mask);
|
|
if ((dbr_mask & (0x3UL << 62)) == 0)
|
|
{
|
|
/* Exit loop if both r and w bits clear */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (idx == max_watchpoints)
|
|
return -1;
|
|
|
|
dbr_addr = (long) addr;
|
|
dbr_mask = (~(len - 1) & 0x00ffffffffffffffL); /* construct mask to match */
|
|
dbr_mask |= 0x0800000000000000L; /* Only match privilege level 3 */
|
|
switch (rw)
|
|
{
|
|
case hw_write:
|
|
dbr_mask |= (1L << 62); /* Set w bit */
|
|
break;
|
|
case hw_read:
|
|
dbr_mask |= (1L << 63); /* Set r bit */
|
|
break;
|
|
case hw_access:
|
|
dbr_mask |= (3L << 62); /* Set both r and w bits */
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
store_debug_register_pair (ptid, idx, &dbr_addr, &dbr_mask);
|
|
enable_watchpoints_in_psr (ptid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ia64_linux_remove_watchpoint (ptid_t ptid, CORE_ADDR addr, int len)
|
|
{
|
|
int idx;
|
|
long dbr_addr, dbr_mask;
|
|
int max_watchpoints = 4;
|
|
|
|
if (len <= 0 || !is_power_of_2 (len))
|
|
return -1;
|
|
|
|
for (idx = 0; idx < max_watchpoints; idx++)
|
|
{
|
|
fetch_debug_register_pair (ptid, idx, &dbr_addr, &dbr_mask);
|
|
if ((dbr_mask & (0x3UL << 62)) && addr == (CORE_ADDR) dbr_addr)
|
|
{
|
|
dbr_addr = 0;
|
|
dbr_mask = 0;
|
|
store_debug_register_pair (ptid, idx, &dbr_addr, &dbr_mask);
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
CORE_ADDR
|
|
ia64_linux_stopped_by_watchpoint (ptid_t ptid)
|
|
{
|
|
CORE_ADDR psr;
|
|
int tid;
|
|
struct siginfo siginfo;
|
|
|
|
tid = TIDGET(ptid);
|
|
if (tid == 0)
|
|
tid = PIDGET (ptid);
|
|
|
|
errno = 0;
|
|
ptrace (PTRACE_GETSIGINFO, tid, (PTRACE_ARG3_TYPE) 0, &siginfo);
|
|
|
|
if (errno != 0 || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
|
|
return 0;
|
|
|
|
psr = read_register_pid (IA64_PSR_REGNUM, ptid);
|
|
psr |= IA64_PSR_DD; /* Set the dd bit - this will disable the watchpoint
|
|
for the next instruction */
|
|
write_register_pid (IA64_PSR_REGNUM, psr, ptid);
|
|
|
|
return (CORE_ADDR) siginfo.si_addr;
|
|
}
|