-/* Target-dependent code for MItsubishi D10V, for GDB.
- Copyright (C) 1996 Free Software Foundation, Inc.
+/* Target-dependent code for Mitsubishi D10V, for GDB.
+ Copyright (C) 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 "symfile.h"
#include "objfiles.h"
-void d10v_frame_find_saved_regs PARAMS ((struct frame_info *fi, struct frame_saved_regs *fsr));
+void d10v_frame_find_saved_regs PARAMS ((struct frame_info *fi,
+ struct frame_saved_regs *fsr));
static void d10v_pop_dummy_frame PARAMS ((struct frame_info *fi));
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
+/* Discard from the stack the innermost frame, restoring all saved
+ registers. */
void
d10v_pop_frame ()
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
{
sal = find_pc_line (func_addr, 0);
- if (sal.end < func_end)
+ if ( sal.end && sal.end < func_end)
return sal.end;
}
printf_filtered ("A0-A1 %010llx %010llx\n",num1, num2);
}
-void
-_initialize_d10v_tdep ()
-{
- tm_print_insn = print_insn_d10v;
- add_com ("regs", class_vars, show_regs, "Print all registers");
-}
-
static CORE_ADDR
d10v_xlate_addr (addr)
int addr;
char regbuf[REGISTER_BYTES];
char *valbuf;
{
- memcpy (valbuf, regbuf + REGISTER_BYTE (2), TYPE_LENGTH (valtype));
+ memcpy (valbuf, regbuf + REGISTER_BYTE (2), TYPE_LENGTH (valtype));
+}
+
+/* The following code implements access to, and display of, the D10V's
+ instruction trace buffer. The buffer consists of 64K or more
+ 4-byte words of data, of which each words includes an 8-bit count,
+ an 8-bit segment number, and a 16-bit instruction address.
+
+ In theory, the trace buffer is continuously capturing instruction
+ data that the CPU presents on its "debug bus", but in practice, the
+ ROMified GDB stub only enables tracing when it continues or steps
+ the program, and stops tracing when the program stops; so it
+ actually works for GDB to read the buffer counter out of memory and
+ then read each trace word. The counter records where the tracing
+ stops, but there is no record of where it started, so we remember
+ the PC when we resumed and then search backwards in the trace
+ buffer for a word that includes that address. This is not perfect,
+ because you will miss trace data if the resumption PC is the target
+ of a branch. (The value of the buffer counter is semi-random, any
+ trace data from a previous program stop is gone.) */
+
+/* The address of the last word recorded in the trace buffer. */
+
+#define DBBC_ADDR (0xd80000)
+
+/* The base of the trace buffer, at least for the "Board_0". */
+
+#define TRACE_BUFFER_BASE (0xf40000)
+
+static void trace_command PARAMS ((char *, int));
+
+static void untrace_command PARAMS ((char *, int));
+
+static void trace_info PARAMS ((char *, int));
+
+static void tdisassemble_command PARAMS ((char *, int));
+
+static void display_trace PARAMS ((int, int));
+
+/* True when instruction traces are being collected. */
+
+static int tracing;
+
+/* Remembered PC. */
+
+static CORE_ADDR last_pc;
+
+/* True when trace output should be displayed whenever program stops. */
+
+static int trace_display;
+
+/* True when trace listing should include source lines. */
+
+static int default_trace_show_source = 1;
+
+struct trace_buffer {
+ int size;
+ short *counts;
+ CORE_ADDR *addrs;
+} trace_data;
+
+static void
+trace_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ /* Clear the host-side trace buffer, allocating space if needed. */
+ trace_data.size = 0;
+ if (trace_data.counts == NULL)
+ trace_data.counts = (short *) xmalloc (65536 * sizeof(short));
+ if (trace_data.addrs == NULL)
+ trace_data.addrs = (CORE_ADDR *) xmalloc (65536 * sizeof(CORE_ADDR));
+
+ tracing = 1;
+
+ printf_filtered ("Tracing is now on.\n");
+}
+
+static void
+untrace_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ tracing = 0;
+
+ printf_filtered ("Tracing is now off.\n");
+}
+
+static void
+trace_info (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ int i;
+
+ if (trace_data.size)
+ {
+ printf_filtered ("%d entries in trace buffer:\n", trace_data.size);
+
+ for (i = 0; i < trace_data.size; ++i)
+ {
+ printf_filtered ("%d: %d instruction%s at 0x%x\n",
+ i, trace_data.counts[i],
+ (trace_data.counts[i] == 1 ? "" : "s"),
+ trace_data.addrs[i]);
+ }
+ }
+ else
+ printf_filtered ("No entries in trace buffer.\n");
+
+ printf_filtered ("Tracing is currently %s.\n", (tracing ? "on" : "off"));
+}
+
+/* Print the instruction at address MEMADDR in debugged memory,
+ on STREAM. Returns length of the instruction, in bytes. */
+
+static int
+print_insn (memaddr, stream)
+ CORE_ADDR memaddr;
+ GDB_FILE *stream;
+{
+ /* If there's no disassembler, something is very wrong. */
+ if (tm_print_insn == NULL)
+ abort ();
+
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ tm_print_insn_info.endian = BFD_ENDIAN_BIG;
+ else
+ tm_print_insn_info.endian = BFD_ENDIAN_LITTLE;
+ return (*tm_print_insn) (memaddr, &tm_print_insn_info);
+}
+
+void
+d10v_eva_prepare_to_trace ()
+{
+ if (!tracing)
+ return;
+
+ last_pc = read_register (PC_REGNUM);
}
+
+/* Collect trace data from the target board and format it into a form
+ more useful for display. */
+
+void
+d10v_eva_get_trace_data ()
+{
+ int count, i, j, oldsize;
+ int trace_addr, trace_seg, trace_cnt, next_cnt;
+ unsigned int last_trace, trace_word, next_word;
+ unsigned int *tmpspace;
+
+ if (!tracing)
+ return;
+
+ tmpspace = xmalloc (65536 * sizeof(unsigned int));
+
+ last_trace = read_memory_unsigned_integer (DBBC_ADDR, 2) << 2;
+
+ /* Collect buffer contents from the target, stopping when we reach
+ the word recorded when execution resumed. */
+
+ count = 0;
+ while (last_trace > 0)
+ {
+ QUIT;
+ trace_word =
+ read_memory_unsigned_integer (TRACE_BUFFER_BASE + last_trace, 4);
+ trace_addr = trace_word & 0xffff;
+ last_trace -= 4;
+ /* Ignore an apparently nonsensical entry. */
+ if (trace_addr == 0xffd5)
+ continue;
+ tmpspace[count++] = trace_word;
+ if (trace_addr == last_pc)
+ break;
+ if (count > 65535)
+ break;
+ }
+
+ /* Move the data to the host-side trace buffer, adjusting counts to
+ include the last instruction executed and transforming the address
+ into something that GDB likes. */
+
+ for (i = 0; i < count; ++i)
+ {
+ trace_word = tmpspace[i];
+ next_word = ((i == 0) ? 0 : tmpspace[i - 1]);
+ trace_addr = trace_word & 0xffff;
+ next_cnt = (next_word >> 24) & 0xff;
+ j = trace_data.size + count - i - 1;
+ trace_data.addrs[j] = (trace_addr << 2) + 0x1000000;
+ trace_data.counts[j] = next_cnt + 1;
+ }
+
+ oldsize = trace_data.size;
+ trace_data.size += count;
+
+ free (tmpspace);
+
+ if (trace_display)
+ display_trace (oldsize, trace_data.size);
+}
+
+static void
+tdisassemble_command (arg, from_tty)
+ char *arg;
+ int from_tty;
+{
+ int i, count;
+ CORE_ADDR low, high;
+ char *space_index;
+
+ if (!arg)
+ {
+ low = 0;
+ high = trace_data.size;
+ }
+ else if (!(space_index = (char *) strchr (arg, ' ')))
+ {
+ low = parse_and_eval_address (arg);
+ high = low + 5;
+ }
+ else
+ {
+ /* Two arguments. */
+ *space_index = '\0';
+ low = parse_and_eval_address (arg);
+ high = parse_and_eval_address (space_index + 1);
+ if (high < low)
+ high = low;
+ }
+
+ printf_filtered ("Dump of trace from %d to %d:\n", low, high);
+
+ display_trace (low, high);
+
+ printf_filtered ("End of trace dump.\n");
+ gdb_flush (gdb_stdout);
+}
+
+static void
+display_trace (low, high)
+ int low, high;
+{
+ int i, count, trace_show_source, first, suppress;
+ CORE_ADDR next_address;
+
+ trace_show_source = default_trace_show_source;
+ if (!have_full_symbols () && !have_partial_symbols())
+ {
+ trace_show_source = 0;
+ printf_filtered ("No symbol table is loaded. Use the \"file\" command.\n");
+ printf_filtered ("Trace will not display any source.\n");
+ }
+
+ first = 1;
+ suppress = 0;
+ for (i = low; i < high; ++i)
+ {
+ next_address = trace_data.addrs[i];
+ count = trace_data.counts[i];
+ while (count-- > 0)
+ {
+ QUIT;
+ if (trace_show_source)
+ {
+ struct symtab_and_line sal, sal_prev;
+
+ sal_prev = find_pc_line (next_address - 4, 0);
+ sal = find_pc_line (next_address, 0);
+
+ if (sal.symtab)
+ {
+ if (first || sal.line != sal_prev.line)
+ print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
+ suppress = 0;
+ }
+ else
+ {
+ if (!suppress)
+ /* FIXME-32x64--assumes sal.pc fits in long. */
+ printf_filtered ("No source file for address %s.\n",
+ local_hex_string((unsigned long) sal.pc));
+ suppress = 1;
+ }
+ }
+ first = 0;
+ print_address (next_address, gdb_stdout);
+ printf_filtered (":");
+ printf_filtered ("\t");
+ wrap_here (" ");
+ next_address = next_address + print_insn (next_address, gdb_stdout);
+ printf_filtered ("\n");
+ gdb_flush (gdb_stdout);
+ }
+ }
+}
+
+extern void (*target_resume_hook) PARAMS ((void));
+extern void (*target_wait_loop_hook) PARAMS ((void));
+
+void
+_initialize_d10v_tdep ()
+{
+ tm_print_insn = print_insn_d10v;
+
+ target_resume_hook = d10v_eva_prepare_to_trace;
+ target_wait_loop_hook = d10v_eva_get_trace_data;
+
+ add_com ("regs", class_vars, show_regs, "Print all registers");
+
+ add_com ("trace", class_support, trace_command,
+ "Enable tracing of instruction execution.");
+
+ add_com ("untrace", class_support, untrace_command,
+ "Disable tracing of instruction execution.");
+
+ add_com ("tdisassemble", class_vars, tdisassemble_command,
+ "Disassemble the trace buffer.\n\
+Two optional arguments specify a range of trace buffer entries\n\
+as reported by info trace (NOT addresses!).");
+
+ add_info ("trace", trace_info,
+ "Display info about the trace data buffer.");
+
+ add_show_from_set (add_set_cmd ("tracedisplay", no_class,
+ var_integer, (char *)&trace_display,
+ "Set automatic display of trace.\n", &setlist),
+ &showlist);
+ add_show_from_set (add_set_cmd ("tracesource", no_class,
+ var_integer, (char *)&default_trace_show_source,
+ "Set display of source code with trace.\n", &setlist),
+ &showlist);
+
+}
projects / binutils.git / blobdiff