Initial revision

1 files changed, 387 insertions, 0 deletions

diff --git a/gdb/ppc-bdm.c b/gdb/ppc-bdm.c
new file mode 100644
index 00000000000..e6b6adfdd71
--- /dev/null
+++ b/gdb/ppc-bdm.c
@@ -0,0 +1,387 @@
+/* Remote target communications for the Macraigor Systems BDM Wiggler
+   talking to a Motorola PPC 8xx ADS board
+   Copyright 1996, 1997 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 "wait.h"
+#include "gdbcmd.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include <sys/types.h>
+#include <signal.h>
+#include "serial.h"
+#include "ocd.h"
+
+static void bdm_ppc_open PARAMS ((char *name, int from_tty));
+
+static int bdm_ppc_wait PARAMS ((int pid,
+				 struct target_waitstatus *target_status));
+
+static void bdm_ppc_fetch_registers PARAMS ((int regno));
+
+static void bdm_ppc_store_registers PARAMS ((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 (name, from_tty)
+     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 int
+bdm_ppc_wait (pid, target_status)
+     int pid;
+     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_pid;
+    }
+
+  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_pid;
+}
+
+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 (regno)
+     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 == MQ_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, &reglen);
+        }
+    }
+  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, &reglen);
+#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 (regno)
+     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 != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
+	{
+/*          printf("write valid reg %d\n", bdm_regno); */
+          ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
+        }
+/*
+      else if (i == MQ_REGNUM)
+        printf("don't write invalid reg %d (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_attach =   NULL;
+  bdm_ppc_ops.to_post_attach = NULL;
+  bdm_ppc_ops.to_require_attach = NULL;
+  bdm_ppc_ops.to_detach =   ocd_detach;
+  bdm_ppc_ops.to_require_detach = NULL;
+  bdm_ppc_ops.to_resume =   ocd_resume;	
+  bdm_ppc_ops.to_wait  =   bdm_ppc_wait;
+  bdm_ppc_ops.to_post_wait = NULL;
+  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_terminal_init  =   NULL;			
+  bdm_ppc_ops.to_terminal_inferior =   NULL;			
+  bdm_ppc_ops.to_terminal_ours_for_output =   NULL;		
+  bdm_ppc_ops.to_terminal_ours  =   NULL;			
+  bdm_ppc_ops.to_terminal_info  =   NULL;			
+  bdm_ppc_ops.to_kill  =   ocd_kill;		
+  bdm_ppc_ops.to_load  =   ocd_load;		
+  bdm_ppc_ops.to_lookup_symbol =   NULL;	
+  bdm_ppc_ops.to_create_inferior =   ocd_create_inferior;
+  bdm_ppc_ops.to_post_startup_inferior = NULL;
+  bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
+  bdm_ppc_ops.to_clone_and_follow_inferior = NULL;          
+  bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;  
+  bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
+  bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
+  bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
+  bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;                      
+  bdm_ppc_ops.to_has_forked = NULL;
+  bdm_ppc_ops.to_has_vforked = NULL;            
+  bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;            
+  bdm_ppc_ops.to_post_follow_vfork = NULL;
+  bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
+  bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
+  bdm_ppc_ops.to_has_execd = NULL;
+  bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
+  bdm_ppc_ops.to_has_exited = NULL;
+  bdm_ppc_ops.to_mourn_inferior =   ocd_mourn;	
+  bdm_ppc_ops.to_can_run  =   0;		
+  bdm_ppc_ops.to_notice_signals =   0;		
+  bdm_ppc_ops.to_thread_alive  =   ocd_thread_alive;
+  bdm_ppc_ops.to_stop  =   ocd_stop;
+  bdm_ppc_ops.to_pid_to_exec_file = NULL;
+  bdm_ppc_ops.to_core_file_to_sym_file = NULL; 		
+  bdm_ppc_ops.to_stratum =   process_stratum;		
+  bdm_ppc_ops.DONT_USE =   NULL;			
+  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_sections =   NULL;			
+  bdm_ppc_ops.to_sections_end =   NULL;			
+  bdm_ppc_ops.to_magic =   OPS_MAGIC ;			
+} /* init_bdm_ppc_ops */
+
+void
+_initialize_bdm_ppc ()
+{
+  init_bdm_ppc_ops() ;
+  add_target (&bdm_ppc_ops);
+}