355 lines
10 KiB
C
355 lines
10 KiB
C
/* Remote target communications for the Macraigor Systems BDM Wiggler
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talking to a Motorola PPC 8xx ADS board
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Copyright 1996, 1997, 1998, 1999, 2000, 2001
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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 "gdbcore.h"
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#include "gdb_string.h"
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#include <fcntl.h>
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#include "frame.h"
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#include "inferior.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "target.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "gdb-stabs.h"
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#include <sys/types.h>
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#include "serial.h"
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#include "ocd.h"
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#include "ppc-tdep.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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static void bdm_ppc_open (char *name, int from_tty);
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static ptid_t bdm_ppc_wait (ptid_t ptid,
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struct target_waitstatus *target_status);
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static void bdm_ppc_fetch_registers (int regno);
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static void bdm_ppc_store_registers (int regno);
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extern struct target_ops bdm_ppc_ops; /* Forward decl */
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/*#define BDM_NUM_REGS 71 */
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#define BDM_NUM_REGS 24
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#define BDM_REGMAP \
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2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
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2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
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2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
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2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
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\
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2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
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2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
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2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
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2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
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\
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26, /* pc (SRR0 (SPR 26)) */ \
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2146, /* ps (MSR) */ \
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2144, /* cnd (CR) */ \
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8, /* lr (SPR 8) */ \
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9, /* cnt (CTR (SPR 9)) */ \
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1, /* xer (SPR 1) */ \
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0, /* mq (SPR 0) */
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char nowatchdog[4] =
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{0xff, 0xff, 0xff, 0x88};
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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static void
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bdm_ppc_open (char *name, int from_tty)
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{
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CORE_ADDR watchdogaddr = 0xff000004;
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ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
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/* We want interrupts to drop us into debugging mode. */
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/* Modify the DER register to accomplish this. */
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ocd_write_bdm_register (149, 0x20024000);
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/* Disable watchdog timer on the board */
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ocd_write_bytes (watchdogaddr, nowatchdog, 4);
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}
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/* Wait until the remote machine stops, then return,
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storing status in STATUS just as `wait' would.
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Returns "pid" (though it's not clear what, if anything, that
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means in the case of this target). */
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static ptid_t
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bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
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{
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int stop_reason;
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target_status->kind = TARGET_WAITKIND_STOPPED;
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stop_reason = ocd_wait ();
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if (stop_reason)
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{
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target_status->value.sig = TARGET_SIGNAL_INT;
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return inferior_ptid;
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}
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target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
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#if 0
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{
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unsigned long ecr, der;
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ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
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der = ocd_read_bdm_register (149); /* Read the debug enables register */
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fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
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}
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#endif
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return inferior_ptid;
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}
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static int bdm_regmap[] =
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{BDM_REGMAP};
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/* Read the remote registers into regs.
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Fetch register REGNO, or all registers if REGNO == -1
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The Wiggler uses the following codes to access the registers:
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0 -> 1023 SPR 0 -> 1023
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0 - SPR 0 - MQ
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1 - SPR 1 - XER
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8 - SPR 8 - LR
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9 - SPR 9 - CTR (known as cnt in GDB)
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26 - SPR 26 - SRR0 - pc
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1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
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2048 -> 2079 R0 -> R31
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2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
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2144 CR (known as cnd in GDB)
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2145 FPCSR
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2146 MSR (known as ps in GDB)
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*/
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static void
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bdm_ppc_fetch_registers (int regno)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
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int i;
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unsigned char *regs;
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int first_regno, last_regno;
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int first_bdm_regno, last_bdm_regno;
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int reglen;
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if (regno == -1)
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{
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first_regno = 0;
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last_regno = NUM_REGS - 1;
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first_bdm_regno = 0;
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last_bdm_regno = BDM_NUM_REGS - 1;
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}
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else
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{
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first_regno = regno;
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last_regno = regno;
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first_bdm_regno = bdm_regmap[regno];
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last_bdm_regno = bdm_regmap[regno];
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}
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if (first_bdm_regno == -1)
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{
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supply_register (first_regno, NULL);
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return; /* Unsupported register */
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}
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/* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
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processors that lack floating point registers, and I don't have
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have the equipment to test it. So we'll leave that case for the
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next person who encounters it. */
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gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
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#if 1
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/* Can't ask for floating point regs on ppc 8xx, also need to
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avoid asking for the mq register. */
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if (first_regno == last_regno) /* only want one reg */
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{
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/* printf("Asking for register %d\n", first_regno); */
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/* if asking for an invalid register */
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if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
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|| (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
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|| ((first_regno >= tdep->ppc_fp0_regnum)
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&& (first_regno < tdep->ppc_fp0_regnum + ppc_num_fprs)))
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{
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/* printf("invalid reg request!\n"); */
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supply_register (first_regno, NULL);
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return; /* Unsupported register */
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}
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else
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{
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regs = ocd_read_bdm_registers (first_bdm_regno,
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last_bdm_regno, ®len);
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}
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}
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else
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internal_error (__FILE__, __LINE__,
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"ppc_bdm_fetch_registers: "
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"'all registers' case not implemented");
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#endif
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#if 0
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regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
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#endif
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for (i = first_regno; i <= last_regno; i++)
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{
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int bdm_regno, regoffset;
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bdm_regno = bdm_regmap[i];
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if (bdm_regno != -1)
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{
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regoffset = bdm_regno - first_bdm_regno;
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if (regoffset >= reglen / 4)
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continue;
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supply_register (i, regs + 4 * regoffset);
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}
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else
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supply_register (i, NULL); /* Unsupported register */
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}
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}
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/* Store register REGNO, or all registers if REGNO == -1, from the contents
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of REGISTERS. FIXME: ignores errors. */
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static void
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bdm_ppc_store_registers (int regno)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
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int i;
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int first_regno, last_regno;
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int first_bdm_regno, last_bdm_regno;
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if (regno == -1)
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{
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first_regno = 0;
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last_regno = NUM_REGS - 1;
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first_bdm_regno = 0;
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last_bdm_regno = BDM_NUM_REGS - 1;
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}
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else
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{
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first_regno = regno;
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last_regno = regno;
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first_bdm_regno = bdm_regmap[regno];
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last_bdm_regno = bdm_regmap[regno];
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}
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if (first_bdm_regno == -1)
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return; /* Unsupported register */
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/* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
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processors that lack floating point registers, and I don't have
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have the equipment to test it. So we'll leave that case for the
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next person who encounters it. */
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gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
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for (i = first_regno; i <= last_regno; i++)
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{
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int bdm_regno;
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bdm_regno = bdm_regmap[i];
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/* only attempt to write if it's a valid ppc 8xx register */
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/* (need to avoid FP regs and MQ reg) */
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if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
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&& (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
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&& ((i < tdep->ppc_fp0_regnum)
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|| (i >= tdep->ppc_fp0_regnum + ppc_num_fprs)))
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{
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/* printf("write valid reg %d\n", bdm_regno); */
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ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
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}
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/*
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else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
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printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
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else
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printf("don't write invalid reg %d\n", bdm_regno);
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*/
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}
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}
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/* Define the target subroutine names */
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struct target_ops bdm_ppc_ops;
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static void
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init_bdm_ppc_ops (void)
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{
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bdm_ppc_ops.to_shortname = "ocd";
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bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
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bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\
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specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
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a wiggler, specify wiggler and then the port it is connected to\n\
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(e.g. wiggler lpt1)."; /* to_doc */
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bdm_ppc_ops.to_open = bdm_ppc_open;
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bdm_ppc_ops.to_close = ocd_close;
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bdm_ppc_ops.to_detach = ocd_detach;
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bdm_ppc_ops.to_resume = ocd_resume;
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bdm_ppc_ops.to_wait = bdm_ppc_wait;
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bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
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bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
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bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
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bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
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bdm_ppc_ops.to_files_info = ocd_files_info;
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bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
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bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
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bdm_ppc_ops.to_kill = ocd_kill;
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bdm_ppc_ops.to_load = ocd_load;
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bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
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bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
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bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
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bdm_ppc_ops.to_stop = ocd_stop;
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bdm_ppc_ops.to_stratum = process_stratum;
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bdm_ppc_ops.to_has_all_memory = 1;
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bdm_ppc_ops.to_has_memory = 1;
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bdm_ppc_ops.to_has_stack = 1;
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bdm_ppc_ops.to_has_registers = 1;
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bdm_ppc_ops.to_has_execution = 1;
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bdm_ppc_ops.to_magic = OPS_MAGIC;
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} /* init_bdm_ppc_ops */
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extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
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void
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_initialize_bdm_ppc (void)
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{
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init_bdm_ppc_ops ();
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add_target (&bdm_ppc_ops);
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}
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