--- /dev/null
+/* Kernel Object Display facility for Cisco
+ Copyright 1999 Free Software Foundation, Inc.
+
+ Written by Tom Tromey <tromey@cygnus.com>.
+
+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 "gdb_string.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+/* Define this to turn off communication with target. */
+/* #define FAKE_PACKET */
+
+/* Size of buffer used for remote communication. */
+#define PBUFSIZ 400
+
+/* Pointers to gdb callbacks. */
+static void (*gdb_kod_display) (char *);
+static void (*gdb_kod_query) (char *, char *, int *);
+
+\f
+
+/* Initialize and return library name and version.
+ The gdb side of KOD, kod.c, passes us two functions: one for
+ displaying output (presumably to the user) and the other for
+ querying the target. */
+char *
+cisco_kod_open (char *arg,
+ void (*display_func) (char *),
+ void (*query_func) (char *, char *, int *))
+{
+ char buffer[PBUFSIZ];
+ int bufsiz = PBUFSIZ;
+ int i, count;
+
+ gdb_kod_display = display_func;
+ gdb_kod_query = query_func;
+
+ /* Get the OS info, and check the version field. This is the stub
+ version, which we use to see whether we will understand what
+ comes back. This is lame, but the `qKoL' request doesn't
+ actually provide enough configurability.
+
+ Right now the only defined version number is `0.0.0'.
+ This stub supports qKoI and the `a' (any) object requests qKaL
+ and qKaI. Each `a' object is returned as a 4-byte integer ID.
+ An info request on an object returns a pair of 4-byte integers;
+ the first is the object pointer and the second is the thread ID. */
+
+#ifndef FAKE_PACKET
+ (*gdb_kod_query) ("oI;", buffer, &bufsiz);
+#else
+ strcpy (buffer, "Cisco IOS/Classic/13.4 0.0.0");
+#endif
+
+ count = 2;
+ for (i = 0; count && buffer[i] != '\0'; ++i)
+ {
+ if (buffer[i] == ' ')
+ --count;
+ }
+
+ if (buffer[i] == '\0')
+ error ("Remote returned malformed packet\n");
+ if (strcmp (&buffer[i], "0.0.0"))
+ error ("Remote returned unknown stub version: %s\n", &buffer[i]);
+
+ /* Return name, version, and description. I hope we have enough
+ space. */
+ return (strdup ("gdbkodcisco v0.0.0 - Cisco Kernel Object Display"));
+}
+
+/* Close the connection. */
+void
+cisco_kod_close ()
+{
+}
+
+/* Print a "bad packet" message. */
+static void
+bad_packet ()
+{
+ (*gdb_kod_display) ("Remote target returned malformed packet.\n");
+}
+
+/* Print information about currently known kernel objects.
+ We currently ignore the argument. There is only one mode of
+ querying the Cisco kernel: we ask for a dump of everything, and
+ it returns it. */
+void
+cisco_kod_request (char *arg, int from_tty)
+{
+ char buffer[PBUFSIZ], command[PBUFSIZ];
+ int done = 0, i;
+ int fail = 0;
+
+ char **sync_ids;
+ int sync_len = 0;
+ int sync_next = 0;
+ char *prev_id = NULL;
+
+ if (! arg || strcmp (arg, "any"))
+ {
+ /* "Top-level" command. This is really silly, but it also seems
+ to be how KOD is defined. */
+ /* Even sillier is the fact that this first line must start
+ with the word "List". See kod.tcl. */
+ (*gdb_kod_display) ("List of Cisco Kernel Objects\n");
+ (*gdb_kod_display) ("Object\tDescription\n");
+ (*gdb_kod_display) ("any\tAny and all objects\n");
+ return;
+ }
+
+ while (! done)
+ {
+ int off = 0; /* Where we are in the string. */
+ long count; /* Number of objects in this packet. */
+ int bufsiz = PBUFSIZ;
+ char *s_end;
+
+ strcpy (command, "aL");
+ if (prev_id)
+ {
+ strcat (command, ",");
+ strcat (command, prev_id);
+ }
+ strcat (command, ";");
+
+#ifndef FAKE_PACKET
+ /* We talk to the target by calling through the query function
+ passed to us when we were initialized. */
+ (*gdb_kod_query) (command, buffer, &bufsiz);
+#else
+ /* Fake up a multi-part packet. */
+ if (! strncmp (&command[3], "a500005a", 8))
+ strcpy (buffer, "KAL,01,1,f500005f;f500005f;");
+ else
+ strcpy (buffer, "KAL,02,0,a500005a;a500005a;de02869f;");
+#endif
+
+ /* Empty response is an error. */
+ if (strlen (buffer) == 0)
+ {
+ (*gdb_kod_display) ("Remote target did not recognize kernel object query command.\n");
+ fail = 1;
+ break;
+ }
+
+ /* If we don't get a `K' response then the buffer holds the
+ target's error message. */
+ if (buffer[0] != 'K')
+ {
+ (*gdb_kod_display) (buffer);
+ fail = 1;
+ break;
+ }
+
+ /* Make sure we get the response we expect. */
+ if (strncmp (buffer, "KAL,", 4))
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ off += 4;
+
+ /* Parse out the count. We expect to convert exactly two
+ characters followed by a comma. */
+ count = strtol (&buffer[off], &s_end, 16);
+ if (s_end - &buffer[off] != 2 || buffer[off + 2] != ',')
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ off += 3;
+
+ /* Parse out the `done' flag. */
+ if ((buffer[off] != '0' && buffer[off] != '1')
+ || buffer[off + 1] != ',')
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ done = buffer[off] == '1';
+ off += 2;
+
+ /* Id of the last item; we might this to construct the next
+ request. */
+ prev_id = &buffer[off];
+ if (strlen (prev_id) < 8 || buffer[off + 8] != ';')
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ buffer[off + 8] = '\0';
+ off += 9;
+
+ if (sync_len == 0)
+ sync_ids = (char **) xmalloc (count * sizeof (char *));
+ else
+ sync_ids = (char **) xrealloc (sync_ids,
+ (sync_len + count) * sizeof (char *));
+ sync_len += count;
+
+ for (i = 0; i < count; ++i)
+ {
+ if (strlen (&buffer[off]) < 8 || buffer[off + 8] != ';')
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ buffer[off + 8] = '\0';
+ sync_ids[sync_next++] = xstrdup (&buffer[off]);
+ off += 9;
+ }
+
+ if (buffer[off] != '\0')
+ {
+ bad_packet ();
+ fail = 1;
+ break;
+ }
+ }
+
+ /* We've collected all the sync object IDs. Now query to get the
+ specific information, and arrange to print this info. */
+ if (! fail)
+ {
+ (*gdb_kod_display) ("Object ID\tObject Pointer\tThread ID\n");
+
+ for (i = 0; i < sync_next; ++i)
+ {
+ int off = 0;
+ int bufsiz = PBUFSIZ;
+
+ /* For now assume a query can be accomplished in a single
+ transaction. This is implied in the protocol document.
+ See comments above, and the KOD protocol document, to
+ understand the parsing of the return value. */
+ strcpy (command, "aI,");
+ strcat (command, sync_ids[i]);
+ strcat (command, ";");
+
+#ifndef FAKE_PACKET
+ (*gdb_kod_query) (command, buffer, &bufsiz);
+#else
+ strcpy (buffer, "KAI,");
+ strcat (buffer, sync_ids[i]);
+ strcat (buffer, ",ffef00a0,cd00123d;");
+#endif
+
+ if (strlen (buffer) == 0)
+ {
+ (*gdb_kod_display) ("Remote target did not recognize KOD command.\n");
+ break;
+ }
+
+ if (strncmp (buffer, "KAI,", 4))
+ {
+ bad_packet ();
+ break;
+ }
+ off += 4;
+
+ if (strncmp (&buffer[off], sync_ids[i], 8)
+ || buffer[off + 8] != ',')
+ {
+ bad_packet ();
+ break;
+ }
+ off += 9;
+
+ /* Extract thread id and sync object pointer. */
+ if (strlen (&buffer[off]) != 2 * 8 + 2
+ || buffer[off + 8] != ','
+ || buffer[off + 17] != ';')
+ {
+ bad_packet ();
+ break;
+ }
+
+ buffer[off + 8] = '\0';
+ buffer[off + 17] = '\0';
+
+ /* Display the result. */
+ (*gdb_kod_display) (sync_ids[i]);
+ (*gdb_kod_display) ("\t");
+ (*gdb_kod_display) (&buffer[off]);
+ (*gdb_kod_display) ("\t");
+ (*gdb_kod_display) (&buffer[off + 9]);
+ (*gdb_kod_display) ("\n");
+ }
+ }
+
+ /* Free memory. */
+ for (i = 0; i < sync_next; ++i)
+ free (sync_ids[i]);
+ free (sync_ids);
+}
--- /dev/null
+/* Kernel Object Display generic routines and callbacks
+ Copyright 1998, 1999 Free Software Foundation, Inc.
+
+ Written by Fernando Nasser <fnasser@cygnus.com> for Cygnus Solutions.
+
+ 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 "command.h"
+#include "gdbcmd.h"
+#include "target.h"
+#include "gdb_string.h"
+
+/* Prototypes for exported functions. */
+void _initialize_kod (void);
+
+/* Prototypes for local functions. */
+static void show_kod (char *, int);
+static void info_kod_command (char *, int);
+static void load_kod_library (char *);
+
+/* Prototypes for callbacks. These are passed into the KOD modules. */
+static void gdb_kod_display (char *);
+static void gdb_kod_query (char *, char *, int *);
+
+/* These functions are imported from the KOD module.
+
+ gdb_kod_open - initiates the KOD connection to the remote. The
+ first argument is the display function the module should use to
+ communicate with the user. The second argument is the query
+ function the display should use to communicate with the target.
+ This should call error() if there is an error. Otherwise it should
+ return a malloc()d string of the form:
+
+ NAME VERSION - DESCRIPTION
+
+ Neither NAME nor VERSION should contain a hyphen.
+
+
+ gdb_kod_request - This is used when the user enters an "info
+ <module>" request. The remaining arguments are passed as the first
+ argument. The second argument is the standard `from_tty'
+ argument.
+
+
+ gdb_kod_close - This is called when the KOD connection to the
+ remote should be terminated. */
+
+static char *(*gdb_kod_open) (void *, void *);
+static void (*gdb_kod_request) (char *, int);
+static void (*gdb_kod_close) ();
+
+
+/* Name of inferior's operating system. */
+char *operating_system;
+
+/* We save a copy of the OS so that we can properly reset when
+ switching OS's. */
+static char *old_operating_system;
+
+/* Functions imported from the library for all supported OSes.
+ FIXME: we really should do something better, such as dynamically
+ loading the KOD modules. */
+extern char *ecos_kod_open (void *, void *);
+extern void ecos_kod_request (char *, int);
+extern void ecos_kod_close ();
+extern char *cisco_kod_open (void *, void *);
+extern void cisco_kod_request (char *, int);
+extern void cisco_kod_close ();
+
+
+/* Print a line of data generated by the module. */
+
+static void
+gdb_kod_display (char *arg)
+{
+ printf_filtered ("%s", arg);
+}
+
+/* Queries the target on behalf of the module. */
+
+static void
+gdb_kod_query (char *arg, char *result, int *maxsiz)
+{
+ int bufsiz = 0;
+
+ /* Check if current target has remote_query capabilities.
+ If not, it does not have kod either. */
+ if (! current_target.to_query)
+ {
+ strcpy (result,
+ "ERR: Kernel Object Display not supported by current target\n");
+ return;
+ }
+
+ /* Just get the maximum buffer size. */
+ target_query ((int) 'K', 0, 0, &bufsiz);
+
+ /* Check if *we* were called just for getting the buffer size. */
+ if (*maxsiz == 0)
+ {
+ *maxsiz = bufsiz;
+ strcpy (result, "OK");
+ return;
+ }
+
+ /* Check if caller can handle a buffer this large, if not, adjust. */
+ if (bufsiz > *maxsiz)
+ bufsiz = *maxsiz;
+
+ /* See if buffer can hold the query (usually it can, as the query is
+ short). */
+ if (strlen (arg) >= bufsiz)
+ error ("kod: query argument too long");
+
+ /* Send actual request. */
+ if (target_query ((int) 'K', arg, result, &bufsiz))
+ strcpy (result, "ERR: remote query failed");
+}
+
+/* Print name of kod command after selecting the appropriate kod
+ formatting library module. As a side effect we create a new "info"
+ subcommand which is what the user actually uses to query the OS. */
+
+static void
+kod_set_os (char *arg, int from_tty, struct cmd_list_element *command)
+{
+ char *p;
+
+ if (command->type != set_cmd)
+ return;
+
+ /* If we had already had an open OS, close it. */
+ if (gdb_kod_close)
+ (*gdb_kod_close) ();
+
+ /* Also remove the old OS's command. */
+ if (old_operating_system)
+ {
+ delete_cmd (old_operating_system, &infolist);
+ free (old_operating_system);
+ }
+ old_operating_system = strdup (operating_system);
+
+ if (! operating_system || ! *operating_system)
+ {
+ /* If user set operating system to empty, we want to forget we
+ had a module open. Setting these variables is just nice for
+ debugging and clarity. */
+ gdb_kod_open = NULL;
+ gdb_kod_request = NULL;
+ gdb_kod_close = NULL;
+ }
+ else
+ {
+ char *kodlib;
+
+ load_kod_library (operating_system);
+
+ kodlib = (*gdb_kod_open) (gdb_kod_display, gdb_kod_query);
+
+ /* Add kod related info commands to gdb. */
+ add_info (operating_system, info_kod_command,
+ "Displays information about Kernel Objects.");
+
+ p = strrchr (kodlib, '-');
+ if (p != NULL)
+ p++;
+ else
+ p = "Unknown KOD library";
+ printf_filtered ("%s - %s\n", operating_system, p);
+
+ free (kodlib);
+ }
+}
+
+/* Print information about currently known kernel objects of the
+ specified type or a list of all known kernel object types if
+ argument is empty. */
+
+static void
+info_kod_command (char *arg, int from_tty)
+{
+ (*gdb_kod_request) (arg, from_tty);
+}
+
+/* Print name of kod command after selecting the appropriate kod
+ formatting library module. */
+
+static void
+load_kod_library (char *lib)
+{
+#if 0
+ /* FIXME: Don't have the eCos code here. */
+ if (! strcmp (lib, "ecos"))
+ {
+ gdb_kod_open = ecos_kod_open;
+ gdb_kod_request = ecos_kod_request;
+ gdb_kod_close = ecos_kod_close;
+ }
+ else
+#endif /* 0 */
+ if (! strcmp (lib, "cisco"))
+ {
+ gdb_kod_open = cisco_kod_open;
+ gdb_kod_request = cisco_kod_request;
+ gdb_kod_close = cisco_kod_close;
+ }
+ else
+ error ("Unknown operating system: %s\n", operating_system);
+}
+
+void
+_initialize_kod ()
+{
+ struct cmd_list_element *c;
+
+ c = add_set_cmd ("os", no_class, var_string,
+ (char *) &operating_system,
+ "Set operating system",
+ &setlist);
+ c->function.sfunc = kod_set_os;
+ add_show_from_set (c, &showlist);
+}
--- /dev/null
+/* Remote debugging interface to Motorola picobug monitor for gdb,
+ the GNU debugger.
+ Copyright 1999 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 "target.h"
+#include "monitor.h"
+#include "gdb_string.h"
+
+/* Functions used only in this file. */
+
+static void init_picobug_cmds (void);
+
+
+/* Functions exported from this file. */
+
+void _initialize_picobug_rom (void);
+
+void picobug_open (char *args, int from_tty);
+
+int picobug_dumpregs (void);
+
+
+static char *picobug_inits[] =
+{"\r", NULL};
+
+static struct target_ops picobug_ops;
+static struct monitor_ops picobug_cmds;
+
+/* Picobug only supports a subset of registers from MCore. In reality,
+ it doesn't support ss1, either. */
+/* *INDENT-OFF* */
+static char *picobug_regnames[] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ "psr", "vbr", "epsr", "fpsr", "epc", "fpc", 0, "ss1",
+ "ss2", "ss3", "ss4", 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ "pc" };
+/* *INDENT-ON* */
+
+
+
+void
+picobug_open (char *args, int from_tty)
+{
+ monitor_open (args, &picobug_cmds, from_tty);
+}
+/* *INDENT-OFF* */
+/* We choose to write our own dumpregs routine, since the output of
+ the register dumping is rather difficult to encapsulate in a
+ regexp:
+
+picobug> rd
+ pc 2f00031e epc 2f00031e fpc 00000000
+ psr 80000101 epsr 80000101 fpsr 00000000
+ss0-ss4 bad0beef 00000000 00000000 00000000 00000000 vbr 30005c00
+ r0-r7 2f0fff4c 00000090 00000001 00000002 00000003 00000004 00000005 00000006
+ r8-r15 2f0fff64 00000000 00000000 00000000 00000000 00000000 00000000 2f00031e */
+/* *INDENT-ON* */
+
+
+
+int
+picobug_dumpregs ()
+{
+ char buf[1024];
+ int resp_len;
+ char *p;
+
+ /* Send the dump register command to the monitor and
+ get the reply. */
+ monitor_printf (picobug_cmds.dump_registers);
+ resp_len = monitor_expect_prompt (buf, sizeof (buf));
+
+ p = strtok (buf, " \t\r\n");
+ while (p)
+ {
+ if (strchr (p, '-'))
+ {
+ /* got a range. either r0-r7, r8-r15 or ss0-ss4 */
+ if (STREQN (p, "r0", 2) || STREQN (p, "r8", 2))
+ {
+ int rn = (p[1] == '0' ? 0 : 8);
+ int i = 0;
+
+ /* Get the next 8 values and record them. */
+ while (i < 8)
+ {
+ p = strtok (NULL, " \t\r\n");
+ if (p)
+ monitor_supply_register (rn + i, p);
+ i++;
+ }
+ }
+ else if (STREQN (p, "ss", 2))
+ {
+ /* get the next five values, ignoring the first */
+ int rn;
+ p = strtok (NULL, " \t\r\n");
+ for (rn = 39; rn < 43; rn++)
+ {
+ p = strtok (NULL, " \t\r\n");
+ if (p)
+ monitor_supply_register (rn, p);
+ }
+ }
+ else
+ {
+ break;
+ }
+ }
+ else
+ {
+ /* Simple register type, paired */
+ char *name = p;
+ int i;
+
+ /* Get and record value */
+ p = strtok (NULL, " \t\r\n");
+ if (p)
+ {
+ for (i = 0; i < NUM_REGS; i++)
+ {
+ if (picobug_regnames[i] && STREQ (picobug_regnames[i], name))
+ break;
+ }
+
+ if (i <= NUM_REGS)
+ monitor_supply_register (i, p);
+ }
+ }
+ p = strtok (NULL, " \t\r\n");
+ }
+
+ return 0;
+}
+
+static void
+init_picobug_cmds (void)
+{
+ picobug_cmds.flags = MO_GETMEM_NEEDS_RANGE | MO_CLR_BREAK_USES_ADDR | MO_PRINT_PROGRAM_OUTPUT;
+
+ picobug_cmds.init = picobug_inits; /* Init strings */
+ picobug_cmds.cont = "g\n"; /* continue command */
+ picobug_cmds.step = "s\n"; /* single step */
+ picobug_cmds.set_break = "br %x\n"; /* set a breakpoint */
+ picobug_cmds.clr_break = "nobr %x\n"; /* clear a breakpoint */
+ picobug_cmds.clr_all_break = "nobr\n"; /* clear all breakpoints */
+ picobug_cmds.setmem.cmdb = "mm %x %x ;b\n"; /* setmem.cmdb (addr, value) */
+ picobug_cmds.setmem.cmdw = "mm %x %x ;h\n"; /* setmem.cmdw (addr, value) */
+ picobug_cmds.setmem.cmdl = "mm %x %x ;w\n"; /* setmem.cmdl (addr, value) */
+ picobug_cmds.getmem.cmdb = "md %x %x\n"; /* getmem.cmdb (start addr, end addr) */
+ picobug_cmds.getmem.resp_delim = ":"; /* getmem.resp_delim */
+ picobug_cmds.setreg.cmd = "rm %s %x\n"; /* setreg.cmd (name, value) */
+ picobug_cmds.getreg.cmd = "rd %s\n"; /* getreg.cmd (name) */
+ picobug_cmds.getreg.resp_delim = ":"; /* getreg.resp_delim */
+ picobug_cmds.dump_registers = "rd\n"; /* dump_registers */
+ picobug_cmds.dumpregs = picobug_dumpregs; /* dump registers parser */
+ picobug_cmds.load = "lo\n"; /* download command */
+ picobug_cmds.prompt = "picobug> "; /* monitor command prompt */
+ picobug_cmds.line_term = "\n"; /* end-of-line terminator */
+ picobug_cmds.target = &picobug_ops; /* target operations */
+ picobug_cmds.stopbits = SERIAL_1_STOPBITS; /* number of stop bits */
+ picobug_cmds.regnames = picobug_regnames; /* registers names */
+ picobug_cmds.num_breakpoints = 20; /* number of breakpoints */
+ picobug_cmds.magic = MONITOR_OPS_MAGIC; /* magic */
+}
+
+void
+_initialize_picobug_rom ()
+{
+ int i;
+
+ /* Initialize m32r RevC monitor target */
+ init_picobug_cmds ();
+ init_monitor_ops (&picobug_ops);
+ picobug_ops.to_shortname = "picobug";
+ picobug_ops.to_longname = "picobug monitor";
+ picobug_ops.to_doc = "Debug via the picobug monitor.\n\
+Specify the serial device it is connected to (e.g. /dev/ttya).";
+ picobug_ops.to_open = picobug_open;
+
+ add_target (&picobug_ops);
+}
--- /dev/null
+/* Target-machine dependent code for Motorola MCore for GDB, the GNU debugger
+ Copyright (C) 1999 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 "frame.h"
+#include "symtab.h"
+#include "value.h"
+#include "gdbcmd.h"
+
+/* Functions declared and used only in this file */
+
+static CORE_ADDR mcore_analyze_prologue (struct frame_info *fi, CORE_ADDR pc, int skip_prologue);
+
+static struct frame_info *analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame);
+
+static int get_insn (CORE_ADDR pc);
+
+/* Functions exported from this file */
+
+int mcore_use_struct_convention (int gcc_p, struct type *type);
+
+void _initialize_mcore (void);
+
+void mcore_init_extra_frame_info (struct frame_info *fi);
+
+CORE_ADDR mcore_frame_saved_pc (struct frame_info *fi);
+
+CORE_ADDR mcore_find_callers_reg (struct frame_info *fi, int regnum);
+
+CORE_ADDR mcore_frame_args_address (struct frame_info *fi);
+
+CORE_ADDR mcore_frame_locals_address (struct frame_info *fi);
+
+void mcore_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset);
+
+CORE_ADDR mcore_push_return_address (CORE_ADDR pc, CORE_ADDR sp);
+
+CORE_ADDR mcore_push_arguments (int nargs, value_ptr * args, CORE_ADDR sp,
+ unsigned char struct_return, CORE_ADDR struct_addr);
+
+void mcore_pop_frame (struct frame_info *fi);
+
+CORE_ADDR mcore_skip_prologue (CORE_ADDR pc);
+
+CORE_ADDR mcore_frame_chain (struct frame_info *fi);
+
+unsigned char *mcore_breakpoint_from_pc (CORE_ADDR * bp_addr, int *bp_size);
+
+int mcore_use_struct_convention (int gcc_p, struct type *type);
+
+void mcore_store_return_value (struct type *type, char *valbuf);
+
+CORE_ADDR mcore_extract_struct_value_address (char *regbuf);
+
+void mcore_extract_return_value (struct type *type, char *regbuf, char *valbuf);
+
+#ifdef MCORE_DEBUG
+int mcore_debug = 0;
+#endif
+
+/* The registers of the Motorola MCore processors */
+/* *INDENT-OFF* */
+char *mcore_register_names[] =
+{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "ar0", "ar1", "ar2", "ar3", "ar4", "ar5", "ar6", "ar7",
+ "ar8", "ar9", "ar10", "ar11", "ar12", "ar13", "ar14", "ar15",
+ "psr", "vbr", "epsr", "fpsr", "epc", "fpc", "ss0", "ss1",
+ "ss2", "ss3", "ss4", "gcr", "gsr", "cr13", "cr14", "cr15",
+ "cr16", "cr17", "cr18", "cr19", "cr20", "cr21", "cr22", "cr23",
+ "cr24", "cr25", "cr26", "cr27", "cr28", "cr29", "cr30", "cr31",
+ "pc" };
+/* *INDENT-ON* */
+
+
+
+/* Additional info that we use for managing frames */
+struct frame_extra_info
+ {
+ /* A generic status word */
+ int status;
+
+ /* Size of this frame */
+ int framesize;
+
+ /* The register that is acting as a frame pointer, if
+ it is being used. This is undefined if status
+ does not contain the flag MY_FRAME_IN_FP. */
+ int fp_regnum;
+ };
+
+/* frame_extra_info status flags */
+
+/* The base of the current frame is actually in the stack pointer.
+ This happens when there is no frame pointer (MCore ABI does not
+ require a frame pointer) or when we're stopped in the prologue or
+ epilogue itself. In these cases, mcore_analyze_prologue will need
+ to update fi->frame before returning or analyzing the register
+ save instructions. */
+#define MY_FRAME_IN_SP 0x1
+
+/* The base of the current frame is in a frame pointer register.
+ This register is noted in frame_extra_info->fp_regnum.
+
+ Note that the existance of an FP might also indicate that the
+ function has called alloca. */
+#define MY_FRAME_IN_FP 0x2
+
+/* This flag is set to indicate that this frame is the top-most
+ frame. This tells frame chain not to bother trying to unwind
+ beyond this frame. */
+#define NO_MORE_FRAMES 0x4
+
+/* Instruction macros used for analyzing the prologue */
+#define IS_SUBI0(x) (((x) & 0xfe0f) == 0x2400) /* subi r0,oimm5 */
+#define IS_STM(x) (((x) & 0xfff0) == 0x0070) /* stm rf-r15,r0 */
+#define IS_STWx0(x) (((x) & 0xf00f) == 0x9000) /* stw rz,(r0,disp) */
+#define IS_STWxy(x) (((x) & 0xf000) == 0x9000) /* stw rx,(ry,disp) */
+#define IS_MOVx0(x) (((x) & 0xfff0) == 0x1200) /* mov rn,r0 */
+#define IS_LRW1(x) (((x) & 0xff00) == 0x7100) /* lrw r1,literal */
+#define IS_MOVI1(x) (((x) & 0xf80f) == 0x6001) /* movi r1,imm7 */
+#define IS_BGENI1(x) (((x) & 0xfe0f) == 0x3201) /* bgeni r1,imm5 */
+#define IS_BMASKI1(x) (((x) & 0xfe0f) == 0x2C01) /* bmaski r1,imm5 */
+#define IS_ADDI1(x) (((x) & 0xfe0f) == 0x2001) /* addi r1,oimm5 */
+#define IS_SUBI1(x) (((x) & 0xfe0f) == 0x2401) /* subi r1,oimm5 */
+#define IS_RSUBI1(x) (((x) & 0xfe0f) == 0x2801) /* rsubi r1,imm5 */
+#define IS_NOT1(x) (((x) & 0xffff) == 0x01f1) /* not r1 */
+#define IS_ROTLI1(x) (((x) & 0xfe0f) == 0x3801) /* rotli r1,imm5 */
+#define IS_BSETI1(x) (((x) & 0xfe0f) == 0x3401) /* bseti r1,imm5 */
+#define IS_BCLRI1(x) (((x) & 0xfe0f) == 0x3001) /* bclri r1,imm5 */
+#define IS_IXH1(x) (((x) & 0xffff) == 0x1d11) /* ixh r1,r1 */
+#define IS_IXW1(x) (((x) & 0xffff) == 0x1511) /* ixw r1,r1 */
+#define IS_SUB01(x) (((x) & 0xffff) == 0x0510) /* subu r0,r1 */
+#define IS_RTS(x) (((x) & 0xffff) == 0x00cf) /* jmp r15 */
+
+#define IS_R1_ADJUSTER(x) \
+ (IS_ADDI1(x) || IS_SUBI1(x) || IS_ROTLI1(x) || IS_BSETI1(x) \
+ || IS_BCLRI1(x) || IS_RSUBI1(x) || IS_NOT1(x) \
+ || IS_IXH1(x) || IS_IXW1(x))
+\f
+
+#ifdef MCORE_DEBUG
+static void
+mcore_dump_insn (char *commnt, CORE_ADDR pc, int insn)
+{
+ if (mcore_debug)
+ {
+ printf_filtered ("MCORE: %s %08x %08x ",
+ commnt, (unsigned int) pc, (unsigned int) insn);
+ (*tm_print_insn) (pc, &tm_print_insn_info);
+ printf_filtered ("\n");
+ }
+}
+#define mcore_insn_debug(args) { if (mcore_debug) printf_filtered args; }
+#else /* !MCORE_DEBUG */
+#define mcore_dump_insn(a,b,c) {}
+#define mcore_insn_debug(args) {}
+#endif
+
+/* Given the address at which to insert a breakpoint (BP_ADDR),
+ what will that breakpoint be?
+
+ For MCore, we have a breakpoint instruction. Since all MCore
+ instructions are 16 bits, this is all we need, regardless of
+ address. bpkt = 0x0000 */
+
+unsigned char *
+mcore_breakpoint_from_pc (CORE_ADDR * bp_addr, int *bp_size)
+{
+ static char breakpoint[] =
+ {0x00, 0x00};
+ *bp_size = 2;
+ return breakpoint;
+}
+
+/* Helper function for several routines below. This funtion simply
+ sets up a fake, aka dummy, frame (not a _call_ dummy frame) that
+ we can analyze with mcore_analyze_prologue. */
+
+static struct frame_info *
+analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame)
+{
+ static struct frame_info *dummy = NULL;
+
+ if (dummy == NULL)
+ {
+ dummy = (struct frame_info *) xmalloc (sizeof (struct frame_info));
+ dummy->saved_regs = (CORE_ADDR *) xmalloc (SIZEOF_FRAME_SAVED_REGS);
+ dummy->extra_info =
+ (struct frame_extra_info *) xmalloc (sizeof (struct frame_extra_info));
+ }
+
+ dummy->next = NULL;
+ dummy->prev = NULL;
+ dummy->pc = pc;
+ dummy->frame = frame;
+ dummy->extra_info->status = 0;
+ dummy->extra_info->framesize = 0;
+ memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS);
+ mcore_analyze_prologue (dummy, 0, 0);
+ return dummy;
+}
+
+/* Function prologues on the Motorol MCore processors consist of:
+
+ - adjustments to the stack pointer (r1 used as scratch register)
+ - store word/multiples that use r0 as the base address
+ - making a copy of r0 into another register (a "frame" pointer)
+
+ Note that the MCore really doesn't have a real frame pointer.
+ Instead, the compiler may copy the SP into a register (usually
+ r8) to act as an arg pointer. For our target-dependent purposes,
+ the frame info's "frame" member will be the beginning of the
+ frame. The SP could, in fact, point below this.
+
+ The prologue ends when an instruction fails to meet either of
+ the first two criteria or when an FP is made. We make a special
+ exception for gcc. When compiling unoptimized code, gcc will
+ setup stack slots. We need to make sure that we skip the filling
+ of these stack slots as much as possible. This is only done
+ when SKIP_PROLOGUE is set, so that it does not mess up
+ backtraces. */
+
+/* Analyze the prologue of frame FI to determine where registers are saved,
+ the end of the prologue, etc. Return the address of the first line
+ of "real" code (i.e., the end of the prologue). */
+
+static CORE_ADDR
+mcore_analyze_prologue (struct frame_info *fi, CORE_ADDR pc, int skip_prologue)
+{
+ CORE_ADDR func_addr, func_end, addr, stop;
+ CORE_ADDR stack_size;
+ int insn, rn;
+ int status, fp_regnum, flags;
+ int framesize;
+ int register_offsets[NUM_REGS];
+ char *name;
+
+ /* If provided, use the PC in the frame to look up the
+ start of this function. */
+ pc = (fi == NULL ? pc : fi->pc);
+
+ /* Find the start of this function. */
+ status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
+
+ /* If the start of this function could not be found or if the debbuger
+ is stopped at the first instruction of the prologue, do nothing. */
+ if (status == 0)
+ return pc;
+
+ /* If the debugger is entry function, give up. */
+ if (func_addr == entry_point_address ())
+ {
+ if (fi != NULL)
+ fi->extra_info->status |= NO_MORE_FRAMES;
+ return pc;
+ }
+
+ /* At the start of a function, our frame is in the stack pointer. */
+ flags = MY_FRAME_IN_SP;
+
+ /* Start decoding the prologue. We start by checking two special cases:
+
+ 1. We're about to return
+ 2. We're at the first insn of the prologue.
+
+ If we're about to return, our frame has already been deallocated.
+ If we are stopped at the first instruction of a prologue,
+ then our frame has not yet been set up. */
+
+ /* Get the first insn from memory (all MCore instructions are 16 bits) */
+ mcore_insn_debug (("MCORE: starting prologue decoding\n"));
+ insn = get_insn (pc);
+ mcore_dump_insn ("got 1: ", pc, insn);
+
+ /* Check for return. */
+ if (fi != NULL && IS_RTS (insn))
+ {
+ mcore_insn_debug (("MCORE: got jmp r15"));
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
+
+ /* Check for first insn of prologue */
+ if (fi != NULL && fi->pc == func_addr)
+ {
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
+
+ /* Figure out where to stop scanning */
+ stop = (fi ? fi->pc : func_end);
+
+ /* Don't walk off the end of the function */
+ stop = (stop > func_end ? func_end : stop);
+
+ /* REGISTER_OFFSETS will contain offsets, from the top of the frame
+ (NOT the frame pointer), for the various saved registers or -1
+ if the register is not saved. */
+ for (rn = 0; rn < NUM_REGS; rn++)
+ register_offsets[rn] = -1;
+
+ /* Analyze the prologue. Things we determine from analyzing the
+ prologue include:
+ * the size of the frame
+ * where saved registers are located (and which are saved)
+ * FP used? */
+ mcore_insn_debug (("MCORE: Scanning prologue: func_addr=0x%x, stop=0x%x\n",
+ (unsigned int) func_addr, (unsigned int) stop));
+
+ framesize = 0;
+ for (addr = func_addr; addr < stop; addr += 2)
+ {
+ /* Get next insn */
+ insn = get_insn (addr);
+ mcore_dump_insn ("got 2: ", addr, insn);
+
+ if (IS_SUBI0 (insn))
+ {
+ int offset = 1 + ((insn >> 4) & 0x1f);
+ mcore_insn_debug (("MCORE: got subi r0,%d; contnuing\n", offset));
+ framesize += offset;
+ continue;
+ }
+ else if (IS_STM (insn))
+ {
+ /* Spill register(s) */
+ int offset;
+ int start_register;
+
+ /* BIG WARNING! The MCore ABI does not restrict functions
+ to taking only one stack allocation. Therefore, when
+ we save a register, we record the offset of where it was
+ saved relative to the current framesize. This will
+ then give an offset from the SP upon entry to our
+ function. Remember, framesize is NOT constant until
+ we're done scanning the prologue. */
+ start_register = (insn & 0xf);
+ mcore_insn_debug (("MCORE: got stm r%d-r15,(r0)\n", start_register));
+
+ for (rn = start_register, offset = 0; rn <= 15; rn++, offset += 4)
+ {
+ register_offsets[rn] = framesize - offset;
+ mcore_insn_debug (("MCORE: r%d saved at 0x%x (offset %d)\n", rn,
+ register_offsets[rn], offset));
+ }
+ mcore_insn_debug (("MCORE: continuing\n"));
+ continue;
+ }
+ else if (IS_STWx0 (insn))
+ {
+ /* Spill register: see note for IS_STM above. */
+ int imm;
+
+ rn = (insn >> 8) & 0xf;
+ imm = (insn >> 4) & 0xf;
+ register_offsets[rn] = framesize - (imm << 2);
+ mcore_insn_debug (("MCORE: r%d saved at offset 0x%x\n", rn, register_offsets[rn]));
+ mcore_insn_debug (("MCORE: continuing\n"));
+ continue;
+ }
+ else if (IS_MOVx0 (insn))
+ {
+ /* We have a frame pointer, so this prologue is over. Note
+ the register which is acting as the frame pointer. */
+ flags |= MY_FRAME_IN_FP;
+ flags &= ~MY_FRAME_IN_SP;
+ fp_regnum = insn & 0xf;
+ mcore_insn_debug (("MCORE: Found a frame pointer: r%d\n", fp_regnum));
+
+ /* If we found an FP, we're at the end of the prologue. */
+ mcore_insn_debug (("MCORE: end of prologue\n"));
+ if (skip_prologue)
+ continue;
+
+ /* If we're decoding prologue, stop here. */
+ addr += 2;
+ break;
+ }
+ else if (IS_STWxy (insn) && (flags & MY_FRAME_IN_FP) && ((insn & 0xf) == fp_regnum))
+ {
+ /* Special case. Skip over stack slot allocs, too. */
+ mcore_insn_debug (("MCORE: push arg onto stack.\n"));
+ continue;
+ }
+ else if (IS_LRW1 (insn) || IS_MOVI1 (insn)
+ || IS_BGENI1 (insn) || IS_BMASKI1 (insn))
+ {
+ int adjust = 0;
+ int offset = 0;
+ int insn2;
+
+ mcore_insn_debug (("MCORE: looking at large frame\n"));
+ if (IS_LRW1 (insn))
+ {
+ adjust =
+ read_memory_integer ((addr + 2 + ((insn & 0xff) << 2)) & 0xfffffffc, 4);
+ }
+ else if (IS_MOVI1 (insn))
+ adjust = (insn >> 4) & 0x7f;
+ else if (IS_BGENI1 (insn))
+ adjust = 1 << ((insn >> 4) & 0x1f);
+ else /* IS_BMASKI (insn) */
+ adjust = (1 << (adjust >> 4) & 0x1f) - 1;
+
+ mcore_insn_debug (("MCORE: base framesize=0x%x\n", adjust));
+
+ /* May have zero or more insns which modify r1 */
+ mcore_insn_debug (("MCORE: looking for r1 adjusters...\n"));
+ offset = 2;
+ insn2 = get_insn (addr + offset);
+ while (IS_R1_ADJUSTER (insn2))
+ {
+ int imm;
+
+ imm = (insn2 >> 4) & 0x1f;
+ mcore_dump_insn ("got 3: ", addr + offset, insn);
+ if (IS_ADDI1 (insn2))
+ {
+ adjust += (imm + 1);
+ mcore_insn_debug (("MCORE: addi r1,%d\n", imm + 1));
+ }
+ else if (IS_SUBI1 (insn2))
+ {
+ adjust -= (imm + 1);
+ mcore_insn_debug (("MCORE: subi r1,%d\n", imm + 1));
+ }
+ else if (IS_RSUBI1 (insn2))
+ {
+ adjust = imm - adjust;
+ mcore_insn_debug (("MCORE: rsubi r1,%d\n", imm + 1));
+ }
+ else if (IS_NOT1 (insn2))
+ {
+ adjust = ~adjust;
+ mcore_insn_debug (("MCORE: not r1\n"));
+ }
+ else if (IS_ROTLI1 (insn2))
+ {
+ adjust <<= imm;
+ mcore_insn_debug (("MCORE: rotli r1,%d\n", imm + 1));
+ }
+ else if (IS_BSETI1 (insn2))
+ {
+ adjust |= (1 << imm);
+ mcore_insn_debug (("MCORE: bseti r1,%d\n", imm));
+ }
+ else if (IS_BCLRI1 (insn2))
+ {
+ adjust &= ~(1 << imm);
+ mcore_insn_debug (("MCORE: bclri r1,%d\n", imm));
+ }
+ else if (IS_IXH1 (insn2))
+ {
+ adjust *= 3;
+ mcore_insn_debug (("MCORE: ix.h r1,r1\n"));
+ }
+ else if (IS_IXW1 (insn2))
+ {
+ adjust *= 5;
+ mcore_insn_debug (("MCORE: ix.w r1,r1\n"));
+ }
+
+ offset += 2;
+ insn2 = get_insn (addr + offset);
+ };
+
+ mcore_insn_debug (("MCORE: done looking for r1 adjusters\n"));
+
+ /* If the next insn adjusts the stack pointer, we keep everything;
+ if not, we scrap it and we've found the end of the prologue. */
+ if (IS_SUB01 (insn2))
+ {
+ addr += offset;
+ framesize += adjust;
+ mcore_insn_debug (("MCORE: found stack adjustment of 0x%x bytes.\n", adjust));
+ mcore_insn_debug (("MCORE: skipping to new address 0x%x\n", addr));
+ mcore_insn_debug (("MCORE: continuing\n"));
+ continue;
+ }
+
+ /* None of these instructions are prologue, so don't touch
+ anything. */
+ mcore_insn_debug (("MCORE: no subu r1,r0, NOT altering framesize.\n"));
+ break;
+ }
+
+ /* This is not a prologue insn, so stop here. */
+ mcore_insn_debug (("MCORE: insn is not a prologue insn -- ending scan\n"));
+ break;
+ }
+
+ mcore_insn_debug (("MCORE: done analyzing prologue\n"));
+ mcore_insn_debug (("MCORE: prologue end = 0x%x\n", addr));
+
+ /* Save everything we have learned about this frame into FI. */
+ if (fi != NULL)
+ {
+ fi->extra_info->framesize = framesize;
+ fi->extra_info->fp_regnum = fp_regnum;
+ fi->extra_info->status = flags;
+
+ /* Fix the frame pointer. When gcc uses r8 as a frame pointer,
+ it is really an arg ptr. We adjust fi->frame to be a "real"
+ frame pointer. */
+ if (fi->next == NULL)
+ {
+ if (fi->extra_info->status & MY_FRAME_IN_SP)
+ fi->frame = read_sp () + framesize;
+ else
+ fi->frame = read_register (fp_regnum) + framesize;
+ }
+
+ /* Note where saved registers are stored. The offsets in REGISTER_OFFSETS
+ are computed relative to the top of the frame. */
+ for (rn = 0; rn < NUM_REGS; rn++)
+ {
+ if (register_offsets[rn] >= 0)
+ {
+ fi->saved_regs[rn] = fi->frame - register_offsets[rn];
+ mcore_insn_debug (("Saved register %s stored at 0x%08x, value=0x%08x\n",
+ mcore_register_names[rn], fi->saved_regs[rn],
+ read_memory_integer (fi->saved_regs[rn], 4)));
+ }
+ }
+ }
+
+ /* Return addr of first non-prologue insn. */
+ return addr;
+}
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+ This will be used to create a new GDB frame struct, and then
+ INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. */
+
+CORE_ADDR
+mcore_frame_chain (struct frame_info * fi)
+{
+ struct frame_info *dummy;
+ CORE_ADDR callers_addr;
+
+ /* Analyze the prologue of this function. */
+ if (fi->extra_info->status == 0)
+ mcore_analyze_prologue (fi, 0, 0);
+
+ /* If mcore_analyze_prologue set NO_MORE_FRAMES, quit now. */
+ if (fi->extra_info->status & NO_MORE_FRAMES)
+ return 0;
+
+ /* Now that we've analyzed our prologue, we can start to ask
+ for information about our caller. The easiest way to do
+ this is to analyze our caller's prologue.
+
+ If our caller has a frame pointer, then we need to find
+ the value of that register upon entry to our frame.
+ This value is either in fi->saved_regs[rn] if it's saved,
+ or it's still in a register.
+
+ If our caller does not have a frame pointer, then his frame base
+ is <our base> + -<caller's frame size>. */
+ dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame);
+
+ if (dummy->extra_info->status & MY_FRAME_IN_FP)
+ {
+ int fp = dummy->extra_info->fp_regnum;
+
+ /* Our caller has a frame pointer. */
+ if (fi->saved_regs[fp] != 0)
+ {
+ /* The "FP" was saved on the stack. Don't forget to adjust
+ the "FP" with the framesize to get a real FP. */
+ callers_addr = read_memory_integer (fi->saved_regs[fp], REGISTER_SIZE)
+ + dummy->extra_info->framesize;
+ }
+ else
+ {
+ /* It's still in the register. Don't forget to adjust
+ the "FP" with the framesize to get a real FP. */
+ callers_addr = read_register (fp) + dummy->extra_info->framesize;
+ }
+ }
+ else
+ {
+ /* Our caller does not have a frame pointer. */
+ callers_addr = fi->frame + dummy->extra_info->framesize;
+ }
+
+ return callers_addr;
+}
+
+/* Skip the prologue of the function at PC. */
+
+CORE_ADDR
+mcore_skip_prologue (CORE_ADDR pc)
+{
+ CORE_ADDR func_addr, func_end;
+ struct symtab_and_line sal;
+
+ /* If we have line debugging information, then the end of the
+ prologue should the first assembly instruction of the first
+ source line */
+ if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ {
+ sal = find_pc_line (func_addr, 0);
+ if (sal.end && sal.end < func_end)
+ return sal.end;
+ }
+
+ return mcore_analyze_prologue (NULL, pc, 1);
+}
+
+/* Return the address at which function arguments are offset. */
+CORE_ADDR
+mcore_frame_args_address (struct frame_info * fi)
+{
+ return fi->frame - fi->extra_info->framesize;
+}
+
+CORE_ADDR
+mcore_frame_locals_address (struct frame_info * fi)
+{
+ return fi->frame - fi->extra_info->framesize;
+}
+
+/* Return the frame pointer in use at address PC. */
+
+void
+mcore_virtual_frame_pointer (CORE_ADDR pc, long *reg, long *offset)
+{
+ struct frame_info *dummy = analyze_dummy_frame (pc, 0);
+ if (dummy->extra_info->status & MY_FRAME_IN_SP)
+ {
+ *reg = SP_REGNUM;
+ *offset = 0;
+ }
+ else
+ {
+ *reg = dummy->extra_info->fp_regnum;
+ *offset = 0;
+ }
+}
+
+/* Find the value of register REGNUM in frame FI. */
+
+CORE_ADDR
+mcore_find_callers_reg (struct frame_info *fi, int regnum)
+{
+ for (; fi != NULL; fi = fi->next)
+ {
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return generic_read_register_dummy (fi->pc, fi->frame, regnum);
+ else if (fi->saved_regs[regnum] != 0)
+ return read_memory_integer (fi->saved_regs[regnum],
+ REGISTER_SIZE);
+ }
+
+ return read_register (regnum);
+}
+
+/* Find the saved pc in frame FI. */
+
+CORE_ADDR
+mcore_frame_saved_pc (struct frame_info * fi)
+{
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
+ else
+ return mcore_find_callers_reg (fi, PR_REGNUM);
+}
+\f
+/* INFERIOR FUNCTION CALLS */
+
+/* This routine gets called when either the user uses the "return"
+ command, or the call dummy breakpoint gets hit. */
+
+void
+mcore_pop_frame (struct frame_info *fi)
+{
+ int rn;
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ generic_pop_dummy_frame ();
+ else
+ {
+ /* Write out the PC we saved. */
+ write_register (PC_REGNUM, FRAME_SAVED_PC (fi));
+
+ /* Restore any saved registers. */
+ for (rn = 0; rn < NUM_REGS; rn++)
+ {
+ if (fi->saved_regs[rn] != 0)
+ {
+ ULONGEST value;
+
+ value = read_memory_unsigned_integer (fi->saved_regs[rn],
+ REGISTER_SIZE);
+ write_register (rn, value);
+ }
+ }
+
+ /* Actually cut back the stack. */
+ write_register (SP_REGNUM, FRAME_FP (fi));
+ }
+
+ /* Finally, throw away any cached frame information. */
+ flush_cached_frames ();
+}
+
+/* Setup arguments and PR for a call to the target. First six arguments
+ go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on to the stack.
+
+ * Types with lengths greater than REGISTER_SIZE may not be split
+ between registers and the stack, and they must start in an even-numbered
+ register. Subsequent args will go onto the stack.
+
+ * Structs may be split between registers and stack, left-aligned.
+
+ * If the function returns a struct which will not fit into registers (it's
+ more than eight bytes), we must allocate for that, too. Gdb will tell
+ us where this buffer is (STRUCT_ADDR), and we simply place it into
+ FIRST_ARGREG, since the MCORE treats struct returns (of less than eight
+ bytes) as hidden first arguments. */
+
+CORE_ADDR
+mcore_push_arguments (int nargs, value_ptr * args, CORE_ADDR sp,
+ unsigned char struct_return, CORE_ADDR struct_addr)
+{
+ int argreg;
+ int argnum;
+ struct stack_arg
+ {
+ int len;
+ char *val;
+ }
+ *stack_args;
+ int nstack_args = 0;
+
+ stack_args = (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg));
+
+ argreg = FIRST_ARGREG;
+
+ /* Align the stack. This is mostly a nop, but not always. It will be needed
+ if we call a function which has argument overflow. */
+ sp &= ~3;
+
+ /* If this function returns a struct which does not fit in the
+ return registers, we must pass a buffer to the function
+ which it can use to save the return value. */
+ if (struct_return)
+ write_register (argreg++, struct_addr);
+
+ /* FIXME: what about unions? */
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ char *val = (char *) VALUE_CONTENTS (args[argnum]);
+ int len = TYPE_LENGTH (VALUE_TYPE (args[argnum]));
+ struct type *type = VALUE_TYPE (args[argnum]);
+ int olen;
+
+ mcore_insn_debug (("MCORE PUSH: argreg=%d; len=%d; %s\n",
+ argreg, len, TYPE_CODE (type) == TYPE_CODE_STRUCT ? "struct" : "not struct"));
+ /* Arguments larger than a register must start in an even
+ numbered register. */
+ olen = len;
+
+ if (TYPE_CODE (type) != TYPE_CODE_STRUCT && len > REGISTER_SIZE && argreg % 2)
+ {
+ mcore_insn_debug (("MCORE PUSH: %d > REGISTER_SIZE: and %s is not even\n",
+ len, mcore_register_names[argreg]));
+ argreg++;
+ }
+
+ if ((argreg <= LAST_ARGREG && len <= (LAST_ARGREG - argreg + 1) * REGISTER_SIZE)
+ || (TYPE_CODE (type) == TYPE_CODE_STRUCT))
+ {
+ /* Something that will fit entirely into registers (or a struct
+ which may be split between registers and stack). */
+ mcore_insn_debug (("MCORE PUSH: arg %d going into regs\n", argnum));
+
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && olen < REGISTER_SIZE)
+ {
+ /* Small structs must be right aligned within the register,
+ the most significant bits are undefined. */
+ write_register (argreg, extract_unsigned_integer (val, len));
+ argreg++;
+ len = 0;
+ }
+
+ while (len > 0 && argreg <= LAST_ARGREG)
+ {
+ write_register (argreg, extract_unsigned_integer (val, REGISTER_SIZE));
+ argreg++;
+ val += REGISTER_SIZE;
+ len -= REGISTER_SIZE;
+ }
+
+ /* Any remainder for the stack is noted below... */
+ }
+ else if (TYPE_CODE (VALUE_TYPE (args[argnum])) != TYPE_CODE_STRUCT
+ && len > REGISTER_SIZE)
+ {
+ /* All subsequent args go onto the stack. */
+ mcore_insn_debug (("MCORE PUSH: does not fit into regs, going onto stack\n"));
+ argnum = LAST_ARGREG + 1;
+ }
+
+ if (len > 0)
+ {
+ /* Note that this must be saved onto the stack */
+ mcore_insn_debug (("MCORE PUSH: adding arg %d to stack\n", argnum));
+ stack_args[nstack_args].val = val;
+ stack_args[nstack_args].len = len;
+ nstack_args++;
+ }
+
+ }
+
+ /* We're done with registers and stack allocation. Now do the actual
+ stack pushes. */
+ while (nstack_args--)
+ {
+ sp -= stack_args[nstack_args].len;
+ write_memory (sp, stack_args[nstack_args].val, stack_args[nstack_args].len);
+ }
+
+ /* Return adjusted stack pointer. */
+ return sp;
+}
+
+/* Store the return address for the call dummy. For MCore, we've
+ opted to use generic call dummies, so we simply store the
+ CALL_DUMMY_ADDRESS into the PR register (r15). */
+
+CORE_ADDR
+mcore_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+ write_register (PR_REGNUM, CALL_DUMMY_ADDRESS ());
+ return sp;
+}
+
+/* Setting/getting return values from functions.
+
+ The Motorola MCore processors use r2/r3 to return anything
+ not larger than 32 bits. Everything else goes into a caller-
+ supplied buffer, which is passed in via a hidden first
+ argument.
+
+ For gdb, this leaves us two routes, based on what
+ USE_STRUCT_CONVENTION (mcore_use_struct_convention) returns.
+ If this macro returns 1, gdb will call STORE_STRUCT_RETURN and
+ EXTRACT_STRUCT_VALUE_ADDRESS.
+
+ If USE_STRUCT_CONVENTION retruns 0, then gdb uses STORE_RETURN_VALUE
+ and EXTRACT_RETURN_VALUE to store/fetch the functions return value. */
+
+/* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of
+ EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc
+ and TYPE is the type (which is known to be struct, union or array). */
+
+int
+mcore_use_struct_convention (int gcc_p, struct type *type)
+{
+ return (TYPE_LENGTH (type) > 8);
+}
+
+/* Where is the return value saved? For MCore, a pointer to
+ this buffer was passed as a hidden first argument, so
+ just return that address. */
+
+CORE_ADDR
+mcore_extract_struct_value_address (char *regbuf)
+{
+ return extract_address (regbuf + REGISTER_BYTE (FIRST_ARGREG), REGISTER_SIZE);
+}
+
+/* Given a function which returns a value of type TYPE, extract the
+ the function's return value and place the result into VALBUF.
+ REGBUF is the register contents of the target. */
+
+void
+mcore_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+{
+ /* Copy the return value (starting) in RETVAL_REGNUM to VALBUF. */
+ /* Only getting the first byte! if len = 1, we need the last byte of
+ the register, not the first. */
+ memcpy (valbuf, regbuf + REGISTER_BYTE (RETVAL_REGNUM) +
+ (TYPE_LENGTH (type) < 4 ? 4 - TYPE_LENGTH (type) : 0), TYPE_LENGTH (type));
+}
+
+/* Store the return value in VALBUF (of type TYPE) where the caller
+ expects to see it.
+
+ Values less than 32 bits are stored in r2, right justified and
+ sign or zero extended.
+
+ Values between 32 and 64 bits are stored in r2 (most
+ significant word) and r3 (least significant word, left justified).
+ Note that this includes structures of less than eight bytes, too. */
+
+void
+mcore_store_return_value (struct type *type, char *valbuf)
+{
+ int value_size;
+ int return_size;
+ int offset;
+ char *zeros;
+
+ value_size = TYPE_LENGTH (type);
+
+ /* Return value fits into registers. */
+ return_size = (value_size + REGISTER_SIZE - 1) & ~(REGISTER_SIZE - 1);
+ offset = REGISTER_BYTE (RETVAL_REGNUM) + (return_size - value_size);
+ zeros = alloca (return_size);
+ memset (zeros, 0, return_size);
+
+ write_register_bytes (REGISTER_BYTE (RETVAL_REGNUM), zeros, return_size);
+ write_register_bytes (offset, valbuf, value_size);
+}
+
+/* Initialize our target-dependent "stuff" for this newly created frame.
+
+ This includes allocating space for saved registers and analyzing
+ the prologue of this frame. */
+
+void
+mcore_init_extra_frame_info (struct frame_info *fi)
+{
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
+
+ frame_saved_regs_zalloc (fi);
+
+ fi->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+ fi->extra_info->status = 0;
+ fi->extra_info->framesize = 0;
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ {
+ /* We need to setup fi->frame here because run_stack_dummy gets it wrong
+ by assuming it's always FP. */
+ fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
+ }
+ else
+ mcore_analyze_prologue (fi, 0, 0);
+}
+
+/* Get an insturction from memory. */
+
+static int
+get_insn (CORE_ADDR pc)
+{
+ char buf[4];
+ int status = read_memory_nobpt (pc, buf, 2);
+ if (status != 0)
+ return 0;
+
+ return extract_unsigned_integer (buf, 2);
+}
+
+void
+_initialize_mcore_tdep ()
+{
+ extern int print_insn_mcore (bfd_vma, disassemble_info *);
+ tm_print_insn = print_insn_mcore;
+
+#ifdef MCORE_DEBUG
+ add_show_from_set (add_set_cmd ("mcoredebug", no_class,
+ var_boolean, (char *) &mcore_debug,
+ "Set mcore debugging.\n", &setlist),
+ &showlist);
+#endif
+}
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