d16461aeef
[description of this patch and ChangeLog entry by Joel Brobecker]
The recent implementation was questionable, and if it worked, it was
only by chance because the requested length is large enough that only
one read was sufficient. Note that the implementation before that
also made that assumption, in the form of only handling
TARGET_OBJECT_UNWIND_TABLE xfer requests when offset was zero.
gdb/ChangeLog:
* ia64-linux-nat.c (ia64_linux_xfer_partial): Reimplement
handling of object == TARGET_OBJECT_UNWIND_TABLE.
936 lines
24 KiB
C
936 lines
24 KiB
C
/* Functions specific to running gdb native on IA-64 running
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GNU/Linux.
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Copyright (C) 1999-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include <string.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 "ia64-tdep.h"
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#include "linux-nat.h"
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#include <signal.h>
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#include <sys/ptrace.h>
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#include "gdb_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/syscall.h>
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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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PT_AR_EC,
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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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static CORE_ADDR
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ia64_register_addr (struct gdbarch *gdbarch, int regno)
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{
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CORE_ADDR addr;
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if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
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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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static int
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ia64_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
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{
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return regno < 0
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|| regno >= gdbarch_num_regs (gdbarch)
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|| u_offsets[regno] == -1;
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}
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static int
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ia64_cannot_store_register (struct gdbarch *gdbarch, 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
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|| regno >= gdbarch_num_regs (gdbarch)
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|| 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 (struct regcache *regcache, const gregset_t *gregsetp)
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{
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int regi;
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const greg_t *regp = (const 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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regcache_raw_supply (regcache, regi, 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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regcache_raw_supply (regcache, IA64_PR_REGNUM, regp + 33);
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for (regi = IA64_BR0_REGNUM; regi <= IA64_BR7_REGNUM; regi++)
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{
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regcache_raw_supply (regcache, regi,
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regp + 34 + (regi - IA64_BR0_REGNUM));
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}
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regcache_raw_supply (regcache, IA64_IP_REGNUM, regp + 42);
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regcache_raw_supply (regcache, IA64_CFM_REGNUM, regp + 43);
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regcache_raw_supply (regcache, IA64_PSR_REGNUM, regp + 44);
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regcache_raw_supply (regcache, IA64_RSC_REGNUM, regp + 45);
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regcache_raw_supply (regcache, IA64_BSP_REGNUM, regp + 46);
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regcache_raw_supply (regcache, IA64_BSPSTORE_REGNUM, regp + 47);
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regcache_raw_supply (regcache, IA64_RNAT_REGNUM, regp + 48);
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regcache_raw_supply (regcache, IA64_CCV_REGNUM, regp + 49);
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regcache_raw_supply (regcache, IA64_UNAT_REGNUM, regp + 50);
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regcache_raw_supply (regcache, IA64_FPSR_REGNUM, regp + 51);
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regcache_raw_supply (regcache, IA64_PFS_REGNUM, regp + 52);
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regcache_raw_supply (regcache, IA64_LC_REGNUM, regp + 53);
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regcache_raw_supply (regcache, IA64_EC_REGNUM, regp + 54);
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}
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void
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fill_gregset (const struct regcache *regcache, 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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regcache_raw_collect (regcache, _regi_, regp + _idx_)
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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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|
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void
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supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
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{
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int regi;
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const char *from;
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const gdb_byte f_zero[16] = { 0 };
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const gdb_byte f_one[16] =
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{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
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|
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/* Kernel generated cores have fr1==0 instead of 1.0. Older GDBs
|
|
did the same. So ignore whatever might be recorded in fpregset_t
|
|
for fr0/fr1 and always supply their expected values. */
|
|
|
|
/* fr0 is always read as zero. */
|
|
regcache_raw_supply (regcache, IA64_FR0_REGNUM, f_zero);
|
|
/* fr1 is always read as one (1.0). */
|
|
regcache_raw_supply (regcache, IA64_FR1_REGNUM, f_one);
|
|
|
|
for (regi = IA64_FR2_REGNUM; regi <= IA64_FR127_REGNUM; regi++)
|
|
{
|
|
from = (const char *) &((*fpregsetp)[regi - IA64_FR0_REGNUM]);
|
|
regcache_raw_supply (regcache, regi, from);
|
|
}
|
|
}
|
|
|
|
/* Given a pointer to a floating point register set in /proc format
|
|
(fpregset_t *), update the register specified by REGNO from gdb's idea
|
|
of the current floating point register set. If REGNO is -1, update
|
|
them all. */
|
|
|
|
void
|
|
fill_fpregset (const struct regcache *regcache,
|
|
fpregset_t *fpregsetp, int regno)
|
|
{
|
|
int regi;
|
|
|
|
for (regi = IA64_FR0_REGNUM; regi <= IA64_FR127_REGNUM; regi++)
|
|
{
|
|
if ((regno == -1) || (regno == regi))
|
|
regcache_raw_collect (regcache, regi,
|
|
&((*fpregsetp)[regi - IA64_FR0_REGNUM]));
|
|
}
|
|
}
|
|
|
|
#define IA64_PSR_DB (1UL << 24)
|
|
#define IA64_PSR_DD (1UL << 39)
|
|
|
|
static void
|
|
enable_watchpoints_in_psr (ptid_t ptid)
|
|
{
|
|
struct regcache *regcache = get_thread_regcache (ptid);
|
|
ULONGEST psr;
|
|
|
|
regcache_cooked_read_unsigned (regcache, IA64_PSR_REGNUM, &psr);
|
|
if (!(psr & IA64_PSR_DB))
|
|
{
|
|
psr |= IA64_PSR_DB; /* Set the db bit - this enables hardware
|
|
watchpoints and breakpoints. */
|
|
regcache_cooked_write_unsigned (regcache, IA64_PSR_REGNUM, psr);
|
|
}
|
|
}
|
|
|
|
static long debug_registers[8];
|
|
|
|
static void
|
|
store_debug_register (ptid_t ptid, int idx, long val)
|
|
{
|
|
int tid;
|
|
|
|
tid = ptid_get_lwp (ptid);
|
|
if (tid == 0)
|
|
tid = ptid_get_pid (ptid);
|
|
|
|
(void) ptrace (PT_WRITE_U, tid, (PTRACE_TYPE_ARG3) (PT_DBR + 8 * idx), val);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int
|
|
ia64_linux_insert_watchpoint (struct target_ops *self,
|
|
CORE_ADDR addr, int len, int rw,
|
|
struct expression *cond)
|
|
{
|
|
struct lwp_info *lp;
|
|
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++)
|
|
{
|
|
dbr_mask = debug_registers[idx * 2 + 1];
|
|
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;
|
|
}
|
|
|
|
debug_registers[2 * idx] = dbr_addr;
|
|
debug_registers[2 * idx + 1] = dbr_mask;
|
|
ALL_LWPS (lp)
|
|
{
|
|
store_debug_register_pair (lp->ptid, idx, &dbr_addr, &dbr_mask);
|
|
enable_watchpoints_in_psr (lp->ptid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ia64_linux_remove_watchpoint (struct target_ops *self,
|
|
CORE_ADDR addr, int len, int type,
|
|
struct expression *cond)
|
|
{
|
|
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++)
|
|
{
|
|
dbr_addr = debug_registers[2 * idx];
|
|
dbr_mask = debug_registers[2 * idx + 1];
|
|
if ((dbr_mask & (0x3UL << 62)) && addr == (CORE_ADDR) dbr_addr)
|
|
{
|
|
struct lwp_info *lp;
|
|
|
|
debug_registers[2 * idx] = 0;
|
|
debug_registers[2 * idx + 1] = 0;
|
|
dbr_addr = 0;
|
|
dbr_mask = 0;
|
|
|
|
ALL_LWPS (lp)
|
|
store_debug_register_pair (lp->ptid, idx, &dbr_addr, &dbr_mask);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
ia64_linux_new_thread (struct lwp_info *lp)
|
|
{
|
|
int i, any;
|
|
|
|
any = 0;
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
if (debug_registers[i] != 0)
|
|
any = 1;
|
|
store_debug_register (lp->ptid, i, debug_registers[i]);
|
|
}
|
|
|
|
if (any)
|
|
enable_watchpoints_in_psr (lp->ptid);
|
|
}
|
|
|
|
static int
|
|
ia64_linux_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
|
|
{
|
|
CORE_ADDR psr;
|
|
siginfo_t siginfo;
|
|
struct regcache *regcache = get_current_regcache ();
|
|
|
|
if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))
|
|
return 0;
|
|
|
|
if (siginfo.si_signo != SIGTRAP
|
|
|| (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
|
|
return 0;
|
|
|
|
regcache_cooked_read_unsigned (regcache, IA64_PSR_REGNUM, &psr);
|
|
psr |= IA64_PSR_DD; /* Set the dd bit - this will disable the watchpoint
|
|
for the next instruction. */
|
|
regcache_cooked_write_unsigned (regcache, IA64_PSR_REGNUM, psr);
|
|
|
|
*addr_p = (CORE_ADDR) siginfo.si_addr;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
ia64_linux_stopped_by_watchpoint (struct target_ops *ops)
|
|
{
|
|
CORE_ADDR addr;
|
|
return ia64_linux_stopped_data_address (ops, &addr);
|
|
}
|
|
|
|
static int
|
|
ia64_linux_can_use_hw_breakpoint (struct target_ops *self,
|
|
int type, int cnt, int othertype)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Fetch register REGNUM from the inferior. */
|
|
|
|
static void
|
|
ia64_linux_fetch_register (struct regcache *regcache, int regnum)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
CORE_ADDR addr;
|
|
size_t size;
|
|
PTRACE_TYPE_RET *buf;
|
|
int pid, i;
|
|
|
|
/* r0 cannot be fetched but is always zero. */
|
|
if (regnum == IA64_GR0_REGNUM)
|
|
{
|
|
const gdb_byte zero[8] = { 0 };
|
|
|
|
gdb_assert (sizeof (zero) == register_size (gdbarch, regnum));
|
|
regcache_raw_supply (regcache, regnum, zero);
|
|
return;
|
|
}
|
|
|
|
/* fr0 cannot be fetched but is always zero. */
|
|
if (regnum == IA64_FR0_REGNUM)
|
|
{
|
|
const gdb_byte f_zero[16] = { 0 };
|
|
|
|
gdb_assert (sizeof (f_zero) == register_size (gdbarch, regnum));
|
|
regcache_raw_supply (regcache, regnum, f_zero);
|
|
return;
|
|
}
|
|
|
|
/* fr1 cannot be fetched but is always one (1.0). */
|
|
if (regnum == IA64_FR1_REGNUM)
|
|
{
|
|
const gdb_byte f_one[16] =
|
|
{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
|
|
|
|
gdb_assert (sizeof (f_one) == register_size (gdbarch, regnum));
|
|
regcache_raw_supply (regcache, regnum, f_one);
|
|
return;
|
|
}
|
|
|
|
if (ia64_cannot_fetch_register (gdbarch, regnum))
|
|
{
|
|
regcache_raw_supply (regcache, regnum, NULL);
|
|
return;
|
|
}
|
|
|
|
/* Cater for systems like GNU/Linux, that implement threads as
|
|
separate processes. */
|
|
pid = ptid_get_lwp (inferior_ptid);
|
|
if (pid == 0)
|
|
pid = ptid_get_pid (inferior_ptid);
|
|
|
|
/* This isn't really an address, but ptrace thinks of it as one. */
|
|
addr = ia64_register_addr (gdbarch, regnum);
|
|
size = register_size (gdbarch, regnum);
|
|
|
|
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
|
buf = alloca (size);
|
|
|
|
/* Read the register contents from the inferior a chunk at a time. */
|
|
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
|
{
|
|
errno = 0;
|
|
buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)addr, 0);
|
|
if (errno != 0)
|
|
error (_("Couldn't read register %s (#%d): %s."),
|
|
gdbarch_register_name (gdbarch, regnum),
|
|
regnum, safe_strerror (errno));
|
|
|
|
addr += sizeof (PTRACE_TYPE_RET);
|
|
}
|
|
regcache_raw_supply (regcache, regnum, buf);
|
|
}
|
|
|
|
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
|
for all registers. */
|
|
|
|
static void
|
|
ia64_linux_fetch_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regnum)
|
|
{
|
|
if (regnum == -1)
|
|
for (regnum = 0;
|
|
regnum < gdbarch_num_regs (get_regcache_arch (regcache));
|
|
regnum++)
|
|
ia64_linux_fetch_register (regcache, regnum);
|
|
else
|
|
ia64_linux_fetch_register (regcache, regnum);
|
|
}
|
|
|
|
/* Store register REGNUM into the inferior. */
|
|
|
|
static void
|
|
ia64_linux_store_register (const struct regcache *regcache, int regnum)
|
|
{
|
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
|
CORE_ADDR addr;
|
|
size_t size;
|
|
PTRACE_TYPE_RET *buf;
|
|
int pid, i;
|
|
|
|
if (ia64_cannot_store_register (gdbarch, regnum))
|
|
return;
|
|
|
|
/* Cater for systems like GNU/Linux, that implement threads as
|
|
separate processes. */
|
|
pid = ptid_get_lwp (inferior_ptid);
|
|
if (pid == 0)
|
|
pid = ptid_get_pid (inferior_ptid);
|
|
|
|
/* This isn't really an address, but ptrace thinks of it as one. */
|
|
addr = ia64_register_addr (gdbarch, regnum);
|
|
size = register_size (gdbarch, regnum);
|
|
|
|
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
|
buf = alloca (size);
|
|
|
|
/* Write the register contents into the inferior a chunk at a time. */
|
|
regcache_raw_collect (regcache, regnum, buf);
|
|
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
|
{
|
|
errno = 0;
|
|
ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)addr, buf[i]);
|
|
if (errno != 0)
|
|
error (_("Couldn't write register %s (#%d): %s."),
|
|
gdbarch_register_name (gdbarch, regnum),
|
|
regnum, safe_strerror (errno));
|
|
|
|
addr += sizeof (PTRACE_TYPE_RET);
|
|
}
|
|
}
|
|
|
|
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
|
this for all registers. */
|
|
|
|
static void
|
|
ia64_linux_store_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regnum)
|
|
{
|
|
if (regnum == -1)
|
|
for (regnum = 0;
|
|
regnum < gdbarch_num_regs (get_regcache_arch (regcache));
|
|
regnum++)
|
|
ia64_linux_store_register (regcache, regnum);
|
|
else
|
|
ia64_linux_store_register (regcache, regnum);
|
|
}
|
|
|
|
|
|
static target_xfer_partial_ftype *super_xfer_partial;
|
|
|
|
/* Implement the to_xfer_partial target_ops method. */
|
|
|
|
static enum target_xfer_status
|
|
ia64_linux_xfer_partial (struct target_ops *ops,
|
|
enum target_object object,
|
|
const char *annex,
|
|
gdb_byte *readbuf, const gdb_byte *writebuf,
|
|
ULONGEST offset, ULONGEST len,
|
|
ULONGEST *xfered_len)
|
|
{
|
|
if (object == TARGET_OBJECT_UNWIND_TABLE && readbuf != NULL)
|
|
{
|
|
static long gate_table_size;
|
|
gdb_byte *tmp_buf;
|
|
long res;
|
|
|
|
/* Probe for the table size once. */
|
|
if (gate_table_size == 0)
|
|
gate_table_size = syscall (__NR_getunwind, NULL, 0);
|
|
if (gate_table_size < 0)
|
|
return TARGET_XFER_E_IO;
|
|
|
|
if (offset >= gate_table_size)
|
|
return TARGET_XFER_EOF;
|
|
|
|
tmp_buf = alloca (gate_table_size);
|
|
res = syscall (__NR_getunwind, tmp_buf, gate_table_size);
|
|
if (res < 0)
|
|
return TARGET_XFER_E_IO;
|
|
gdb_assert (res == gate_table_size);
|
|
|
|
if (offset + len > gate_table_size)
|
|
len = gate_table_size - offset;
|
|
|
|
memcpy (readbuf, tmp_buf + offset, len);
|
|
*xfered_len = len;
|
|
return TARGET_XFER_OK;
|
|
}
|
|
|
|
return super_xfer_partial (ops, object, annex, readbuf, writebuf,
|
|
offset, len, xfered_len);
|
|
}
|
|
|
|
/* For break.b instruction ia64 CPU forgets the immediate value and generates
|
|
SIGILL with ILL_ILLOPC instead of more common SIGTRAP with TRAP_BRKPT.
|
|
ia64 does not use gdbarch_decr_pc_after_break so we do not have to make any
|
|
difference for the signals here. */
|
|
|
|
static int
|
|
ia64_linux_status_is_event (int status)
|
|
{
|
|
return WIFSTOPPED (status) && (WSTOPSIG (status) == SIGTRAP
|
|
|| WSTOPSIG (status) == SIGILL);
|
|
}
|
|
|
|
void _initialize_ia64_linux_nat (void);
|
|
|
|
void
|
|
_initialize_ia64_linux_nat (void)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
/* Fill in the generic GNU/Linux methods. */
|
|
t = linux_target ();
|
|
|
|
/* Override the default fetch/store register routines. */
|
|
t->to_fetch_registers = ia64_linux_fetch_registers;
|
|
t->to_store_registers = ia64_linux_store_registers;
|
|
|
|
/* Override the default to_xfer_partial. */
|
|
super_xfer_partial = t->to_xfer_partial;
|
|
t->to_xfer_partial = ia64_linux_xfer_partial;
|
|
|
|
/* Override watchpoint routines. */
|
|
|
|
/* The IA-64 architecture can step over a watch point (without triggering
|
|
it again) if the "dd" (data debug fault disable) bit in the processor
|
|
status word is set.
|
|
|
|
This PSR bit is set in ia64_linux_stopped_by_watchpoint when the
|
|
code there has determined that a hardware watchpoint has indeed
|
|
been hit. The CPU will then be able to execute one instruction
|
|
without triggering a watchpoint. */
|
|
|
|
t->to_have_steppable_watchpoint = 1;
|
|
t->to_can_use_hw_breakpoint = ia64_linux_can_use_hw_breakpoint;
|
|
t->to_stopped_by_watchpoint = ia64_linux_stopped_by_watchpoint;
|
|
t->to_stopped_data_address = ia64_linux_stopped_data_address;
|
|
t->to_insert_watchpoint = ia64_linux_insert_watchpoint;
|
|
t->to_remove_watchpoint = ia64_linux_remove_watchpoint;
|
|
|
|
/* Register the target. */
|
|
linux_nat_add_target (t);
|
|
linux_nat_set_new_thread (t, ia64_linux_new_thread);
|
|
linux_nat_set_status_is_event (t, ia64_linux_status_is_event);
|
|
}
|