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| Current File : //usr/src/contrib/gdb/gdb/ppc-bdm.c |
/* Remote target communications for the Macraigor Systems BDM Wiggler
talking to a Motorola PPC 8xx ADS board
Copyright 1996, 1997, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "gdbcore.h"
#include "gdb_string.h"
#include <fcntl.h>
#include "frame.h"
#include "inferior.h"
#include "bfd.h"
#include "symfile.h"
#include "target.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
#include <sys/types.h>
#include "serial.h"
#include "ocd.h"
#include "ppc-tdep.h"
#include "regcache.h"
static void bdm_ppc_open (char *name, int from_tty);
static ptid_t bdm_ppc_wait (ptid_t ptid,
struct target_waitstatus *target_status);
static void bdm_ppc_fetch_registers (int regno);
static void bdm_ppc_store_registers (int regno);
extern struct target_ops bdm_ppc_ops; /* Forward decl */
/*#define BDM_NUM_REGS 71 */
#define BDM_NUM_REGS 24
#define BDM_REGMAP \
2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
\
2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
\
26, /* pc (SRR0 (SPR 26)) */ \
2146, /* ps (MSR) */ \
2144, /* cnd (CR) */ \
8, /* lr (SPR 8) */ \
9, /* cnt (CTR (SPR 9)) */ \
1, /* xer (SPR 1) */ \
0, /* mq (SPR 0) */
char nowatchdog[4] =
{0xff, 0xff, 0xff, 0x88};
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
static void
bdm_ppc_open (char *name, int from_tty)
{
CORE_ADDR watchdogaddr = 0xff000004;
ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
/* We want interrupts to drop us into debugging mode. */
/* Modify the DER register to accomplish this. */
ocd_write_bdm_register (149, 0x20024000);
/* Disable watchdog timer on the board */
ocd_write_bytes (watchdogaddr, nowatchdog, 4);
}
/* Wait until the remote machine stops, then return,
storing status in STATUS just as `wait' would.
Returns "pid" (though it's not clear what, if anything, that
means in the case of this target). */
static ptid_t
bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
{
int stop_reason;
target_status->kind = TARGET_WAITKIND_STOPPED;
stop_reason = ocd_wait ();
if (stop_reason)
{
target_status->value.sig = TARGET_SIGNAL_INT;
return inferior_ptid;
}
target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
#if 0
{
unsigned long ecr, der;
ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
der = ocd_read_bdm_register (149); /* Read the debug enables register */
fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
}
#endif
return inferior_ptid;
}
static int bdm_regmap[] =
{BDM_REGMAP};
/* Read the remote registers into regs.
Fetch register REGNO, or all registers if REGNO == -1
The Wiggler uses the following codes to access the registers:
0 -> 1023 SPR 0 -> 1023
0 - SPR 0 - MQ
1 - SPR 1 - XER
8 - SPR 8 - LR
9 - SPR 9 - CTR (known as cnt in GDB)
26 - SPR 26 - SRR0 - pc
1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
2048 -> 2079 R0 -> R31
2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
2144 CR (known as cnd in GDB)
2145 FPCSR
2146 MSR (known as ps in GDB)
*/
static void
bdm_ppc_fetch_registers (int regno)
{
int i;
unsigned char *regs, *beginregs, *endregs, *almostregs;
unsigned char midregs[32];
unsigned char mqreg[1];
int first_regno, last_regno;
int first_bdm_regno, last_bdm_regno;
int reglen, beginreglen, endreglen;
#if 1
for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
{
midregs[i] = -1;
}
mqreg[0] = -1;
#endif
if (regno == -1)
{
first_regno = 0;
last_regno = NUM_REGS - 1;
first_bdm_regno = 0;
last_bdm_regno = BDM_NUM_REGS - 1;
}
else
{
first_regno = regno;
last_regno = regno;
first_bdm_regno = bdm_regmap[regno];
last_bdm_regno = bdm_regmap[regno];
}
if (first_bdm_regno == -1)
{
supply_register (first_regno, NULL);
return; /* Unsupported register */
}
#if 1
/* Can't ask for floating point regs on ppc 8xx, also need to
avoid asking for the mq register. */
if (first_regno == last_regno) /* only want one reg */
{
/* printf("Asking for register %d\n", first_regno); */
/* if asking for an invalid register */
if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
|| (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
|| ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
{
/* printf("invalid reg request!\n"); */
supply_register (first_regno, NULL);
return; /* Unsupported register */
}
else
{
regs = ocd_read_bdm_registers (first_bdm_regno,
last_bdm_regno, ®len);
}
}
else
/* want all regs */
{
/* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
beginregs = ocd_read_bdm_registers (first_bdm_regno,
FP0_REGNUM - 1, &beginreglen);
endregs = (strcat (midregs,
ocd_read_bdm_registers (FPLAST_REGNUM + 1,
last_bdm_regno - 1, &endreglen)));
almostregs = (strcat (beginregs, endregs));
regs = (strcat (almostregs, mqreg));
reglen = beginreglen + 32 + endreglen + 1;
}
#endif
#if 0
regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
#endif
for (i = first_regno; i <= last_regno; i++)
{
int bdm_regno, regoffset;
bdm_regno = bdm_regmap[i];
if (bdm_regno != -1)
{
regoffset = bdm_regno - first_bdm_regno;
if (regoffset >= reglen / 4)
continue;
supply_register (i, regs + 4 * regoffset);
}
else
supply_register (i, NULL); /* Unsupported register */
}
}
/* Store register REGNO, or all registers if REGNO == -1, from the contents
of REGISTERS. FIXME: ignores errors. */
static void
bdm_ppc_store_registers (int regno)
{
int i;
int first_regno, last_regno;
int first_bdm_regno, last_bdm_regno;
if (regno == -1)
{
first_regno = 0;
last_regno = NUM_REGS - 1;
first_bdm_regno = 0;
last_bdm_regno = BDM_NUM_REGS - 1;
}
else
{
first_regno = regno;
last_regno = regno;
first_bdm_regno = bdm_regmap[regno];
last_bdm_regno = bdm_regmap[regno];
}
if (first_bdm_regno == -1)
return; /* Unsupported register */
for (i = first_regno; i <= last_regno; i++)
{
int bdm_regno;
bdm_regno = bdm_regmap[i];
/* only attempt to write if it's a valid ppc 8xx register */
/* (need to avoid FP regs and MQ reg) */
if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
&& (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
&& ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
{
/* printf("write valid reg %d\n", bdm_regno); */
ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
}
/*
else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
else
printf("don't write invalid reg %d\n", bdm_regno);
*/
}
}
/* Define the target subroutine names */
struct target_ops bdm_ppc_ops;
static void
init_bdm_ppc_ops (void)
{
bdm_ppc_ops.to_shortname = "ocd";
bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\
specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
a wiggler, specify wiggler and then the port it is connected to\n\
(e.g. wiggler lpt1)."; /* to_doc */
bdm_ppc_ops.to_open = bdm_ppc_open;
bdm_ppc_ops.to_close = ocd_close;
bdm_ppc_ops.to_detach = ocd_detach;
bdm_ppc_ops.to_resume = ocd_resume;
bdm_ppc_ops.to_wait = bdm_ppc_wait;
bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
bdm_ppc_ops.to_files_info = ocd_files_info;
bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
bdm_ppc_ops.to_kill = ocd_kill;
bdm_ppc_ops.to_load = ocd_load;
bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
bdm_ppc_ops.to_stop = ocd_stop;
bdm_ppc_ops.to_stratum = process_stratum;
bdm_ppc_ops.to_has_all_memory = 1;
bdm_ppc_ops.to_has_memory = 1;
bdm_ppc_ops.to_has_stack = 1;
bdm_ppc_ops.to_has_registers = 1;
bdm_ppc_ops.to_has_execution = 1;
bdm_ppc_ops.to_magic = OPS_MAGIC;
} /* init_bdm_ppc_ops */
extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
void
_initialize_bdm_ppc (void)
{
init_bdm_ppc_ops ();
add_target (&bdm_ppc_ops);
}