From 48712b30609bb6020803bc8105c21a9c629cf7ce Mon Sep 17 00:00:00 2001 From: Stan Shebs Date: Fri, 6 Dec 1996 07:37:24 +0000 Subject: [PATCH] * d10v-tdep.c: Add support for examination and interpretation of instruction trace buffer. (trace, untrace, info trace, tdisassemble): New commands. --- gdb/ChangeLog | 34 ++++--- gdb/d10v-tdep.c | 311 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 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 + + * 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 * config/sparc/tm-sparclet.h (TARGET_BYTE_ORDER): Undef. @@ -8,9 +16,7 @@ Thu Dec 5 14:06:23 1996 Doug Evans Wed Dec 4 16:34:05 1996 Geoffrey Noer - * 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 @@ -29,11 +35,11 @@ Tue Dec 3 11:38:14 1996 Michael Snyder 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 - * 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 - * 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 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); + +} -- 2.7.4