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-rw-r--r--gdb/ChangeLog34
-rw-r--r--gdb/d10v-tdep.c311
2 files changed, 321 insertions, 24 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d952905..7692c0c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+start-sanitize-d10v
+Thu Dec 5 23:30:44 1996 Stan Shebs <shebs@andros.cygnus.com>
+
+ * d10v-tdep.c: Add support for examination and interpretation
+ of instruction trace buffer.
+ (trace, untrace, info trace, tdisassemble): New commands.
+
+end-sanitize-d10v
Thu Dec 5 14:06:23 1996 Doug Evans <dje@canuck.cygnus.com>
* config/sparc/tm-sparclet.h (TARGET_BYTE_ORDER): Undef.
@@ -8,9 +16,7 @@ Thu Dec 5 14:06:23 1996 Doug Evans <dje@canuck.cygnus.com>
Wed Dec 4 16:34:05 1996 Geoffrey Noer <noer@cygnus.com>
- * config/mn10300/mn10300.mt
- * config/mn10300/tm-mn10300.h: new config files for mn10300
- processor
+ * config/mn10300/mn10300.mt, config/mn10300/tm-mn10300.h: New.
Tue Dec 3 13:02:08 1996 Fred Fish <fnf@ninemoons.com>
@@ -29,11 +35,11 @@ Tue Dec 3 11:38:14 1996 Michael Snyder <msnyder@cleaver.cygnus.com>
code for generic call_dummy frames.
* config/h8300/tm-h8300.h: turn on USE_GENERIC_DUMMY_FRAMES
start-sanitize-m32r
- * config/m32r/tm-m32r.h: turn on USE_GENERIC_DUMMY_FRAMES
+ * config/m32r/tm-m32r.h: Ditto.
end-sanitize-m32r
- * config/sh/tm-sh.h: turn on USE_GENERIC_DUMMY_FRAMES
+ * config/sh/tm-sh.h: Ditto.
start-sanitize-v850
- * config/v850/tm-v850.h: turn on USE_GENERIC_DUMMY_FRAMES
+ * config/v850/tm-v850.h: Ditto.
end-sanitize-v850
Sun Dec 1 00:41:47 1996 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
@@ -43,7 +49,7 @@ Sun Dec 1 00:41:47 1996 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
Sun Dec 1 00:40:46 1996 Geoffrey Noer <noer@cygnus.com>
- * configure.tgt: add new mn10300 entry
+ * configure.tgt: Add new mn10300 entry.
Sun Dec 1 00:18:59 1996 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
@@ -255,18 +261,14 @@ Thu Nov 28 00:46:24 1996 Peter Schauer (pes@regent.e-technik.tu-muenchen.de)
Wed Nov 27 11:29:06 1996 Michael Snyder <msnyder@cleaver.cygnus.com>
- * blockframe.c: ...Remove old-style CALL_DUMMY code...
- * h8300-tdep.c: ditto
- * config/h8300/tm-h8300.h: ditto
+ * blockframe.c: Remove old-style CALL_DUMMY code.
+ * h8300-tdep.c, config/h8300/tm-h8300.h: Ditto.
start-sanitize-m32r
- * m32r-tdep.c: ditto
- * config/m32r/tm-m32r.h: ditto
+ * m32r-tdep.c, config/m32r/tm-m32r.h: Ditto.
end-sanitize-m32r
- * sh-tdep.c: ditto
- * config/sh/tm-sh.h: ditto
+ * sh-tdep.c, config/sh/tm-sh.h: Ditto.
start-sanitize-v850
- * v850-tdep.c: ditto
- * config/v850/tm-v850.h: ditto
+ * v850-tdep.c, config/v850/tm-v850.h: Ditto.
end-sanitize-v850
Wed Nov 27 10:32:14 1996 Michael Snyder <msnyder@cleaver.cygnus.com>
diff --git a/gdb/d10v-tdep.c b/gdb/d10v-tdep.c
index 3ac0572..790a153 100644
--- a/gdb/d10v-tdep.c
+++ b/gdb/d10v-tdep.c
@@ -436,13 +436,6 @@ show_regs (args, from_tty)
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;
@@ -651,5 +644,307 @@ d10v_extract_return_value (valtype, regbuf, valbuf)
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,
+ and 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;
+
+static int trace_display;
+
+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;
+
+ 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]);
+ }
+
+ 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;
+
+#if 0
+ printf_filtered("Last pc is %x, is now %x\n",
+ last_pc, read_register (PC_REGNUM));
+#endif
+
+ /* 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;
+#if 0
+ trace_seg = (trace_word >> 16) & 0xff;
+ trace_cnt = (trace_word >> 24) & 0xff;
+ printf_filtered("Trace word at %x is %x %x %x\n", last_trace,
+ trace_cnt, trace_seg, trace_addr);
+#endif
+ 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 0
+ for (i = 0; i < trace_data.size; ++i)
+ {
+ printf_filtered("%d insns after %x\n",
+ trace_data.counts[i], trace_data.addrs[i]);
+ }
+#endif
+
+ 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);
+ }
+
+ printf_filtered ("Dump of trace ");
+ printf_filtered ("from ");
+ print_address_numeric (low, 1, gdb_stdout);
+ printf_filtered (" to ");
+ print_address_numeric (high, 1, gdb_stdout);
+ printf_filtered (":\n");
+
+ 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;
+ CORE_ADDR next_address;
+
+ for (i = low; i < high; ++i)
+ {
+ next_address = trace_data.addrs[i];
+ count = trace_data.counts[i];
+ while (count-- > 0)
+ {
+ QUIT;
+ 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);
+ }
+ }
}
+
+void
+_initialize_d10v_tdep ()
+{
+ tm_print_insn = print_insn_d10v;
+
+ 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);
+
+}
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