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/*
* This software is part of the SBCL system. See the README file for
* more information.
*
* This software is derived from the CMU CL system, which was
* written at Carnegie Mellon University and released into the
* public domain. The software is in the public domain and is
* provided with absolutely no warranty. See the COPYING and CREDITS
* files for more information.
*/
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <setjmp.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <signal.h>
#include <unistd.h>
#include "runtime.h"
#include "sbcl.h"
/* Almost all of this file can be skipped if we're not supporting LDB. */
#if defined(LISP_FEATURE_SB_LDB)
#include "print.h"
#include "arch.h"
#include "interr.h"
#include "gc.h"
#include "search.h"
#include "purify.h"
#include "globals.h"
#include "lispregs.h"
#include "interrupt.h"
#include "thread.h"
#include "genesis/static-symbols.h"
#include "genesis/primitive-objects.h"
/* When we need to do command input, we use this stream, which is not
* in general stdin, so that things will "work" (as well as being
* thrown into ldb can be considered "working":-) even in a process
* where standard input has been redirected to a file or pipe.
*
* (We could set up output to go to a special ldb_out stream for the
* same reason, but there's been no pressure for that so far.)
*
* The enter-the-ldb-monitor function is responsible for setting up
* this stream. */
static FILE *ldb_in = 0;
static int ldb_in_fd = -1;
typedef void cmd(char **ptr);
static cmd dump_cmd, print_cmd, quit_cmd, help_cmd;
static cmd flush_cmd, search_cmd, regs_cmd, exit_cmd;
static cmd print_context_cmd;
static cmd backtrace_cmd, purify_cmd, catchers_cmd;
static cmd grab_sigs_cmd;
static cmd kill_cmd;
static struct cmd {
char *cmd, *help;
void (*fn)(char **ptr);
} supported_cmds[] = {
{"help", "Display this help information.", help_cmd},
{"?", "(an alias for help)", help_cmd},
{"backtrace", "Backtrace up to N frames.", backtrace_cmd},
{"catchers", "Print a list of all the active catchers.", catchers_cmd},
{"context", "Print interrupt context number I.", print_context_cmd},
{"dump", "Dump memory starting at ADDRESS for COUNT words.", dump_cmd},
{"d", "(an alias for dump)", dump_cmd},
{"exit", "Exit this instance of the monitor.", exit_cmd},
{"flush", "Flush all temp variables.", flush_cmd},
/* (Classic CMU CL had a "gc" command here, which seems like a
* reasonable idea, but the code was stale (incompatible with
* gencgc) so I just flushed it. -- WHN 20000814 */
{"grab-signals", "Set the signal handlers to call LDB.", grab_sigs_cmd},
{"kill", "Kill ourself with signal number N (useful if running under gdb)",
kill_cmd},
{"purify", "Purify. (Caveat purifier!)", purify_cmd},
{"print", "Print object at ADDRESS.", print_cmd},
{"p", "(an alias for print)", print_cmd},
{"quit", "Quit.", quit_cmd},
{"regs", "Display current Lisp registers.", regs_cmd},
{"search", "Search for TYPE starting at ADDRESS for a max of COUNT words.", search_cmd},
{"s", "(an alias for search)", search_cmd},
{NULL, NULL, NULL}
};
static jmp_buf curbuf;
static int
visible(unsigned char c)
{
if (c < ' ' || c > '~')
return ' ';
else
return c;
}
static void
dump_cmd(char **ptr)
{
static char *lastaddr = 0;
static int lastcount = 20;
char *addr = lastaddr;
int count = lastcount, displacement;
if (more_p(ptr)) {
addr = parse_addr(ptr);
if (more_p(ptr))
count = parse_number(ptr);
}
if (count == 0) {
printf("COUNT must be non-zero.\n");
return;
}
lastcount = count;
if (count > 0)
displacement = 4;
else {
displacement = -4;
count = -count;
}
while (count-- > 0) {
#ifndef alpha
printf("0x%08lX: ", (unsigned long) addr);
#else
printf("0x%08X: ", (u32) addr);
#endif
if (is_valid_lisp_addr((os_vm_address_t)addr)) {
#ifndef alpha
unsigned long *lptr = (unsigned long *)addr;
#else
u32 *lptr = (u32 *)addr;
#endif
unsigned short *sptr = (unsigned short *)addr;
unsigned char *cptr = (unsigned char *)addr;
printf("0x%08lx 0x%04x 0x%04x 0x%02x 0x%02x 0x%02x 0x%02x %c%c%c%c\n", lptr[0], sptr[0], sptr[1], cptr[0], cptr[1], cptr[2], cptr[3], visible(cptr[0]), visible(cptr[1]), visible(cptr[2]), visible(cptr[3]));
}
else
printf("invalid Lisp-level address\n");
addr += displacement;
}
lastaddr = addr;
}
static void
print_cmd(char **ptr)
{
lispobj obj = parse_lispobj(ptr);
print(obj);
}
static void
kill_cmd(char **ptr)
{
kill(getpid(), parse_number(ptr));
}
static void
regs_cmd(char **ptr)
{
printf("CSP\t=\t0x%08lX\n", (unsigned long)current_control_stack_pointer);
printf("FP\t=\t0x%08lX\n", (unsigned long)current_control_frame_pointer);
#if !defined(__i386__)
printf("BSP\t=\t0x%08X\n", (unsigned long)current_binding_stack_pointer);
#endif
#if 0
#ifdef __i386__
printf("BSP\t=\t0x%08lx\n",
(unsigned long)SymbolValue(BINDING_STACK_POINTER));
#endif
printf("DYNAMIC\t=\t0x%08lx\n", (unsigned long)DYNAMIC_SPACE_START);
#if defined(__i386__)
printf("ALLOC\t=\t0x%08lx\n",
(unsigned long)SymbolValue(ALLOCATION_POINTER));
#else
printf("ALLOC\t=\t0x%08X\n",
(unsigned long)dynamic_space_free_pointer);
printf("TRIGGER\t=\t0x%08lx\n", (unsigned long)current_auto_gc_trigger);
#endif
printf("STATIC\t=\t0x%08lx\n",
(unsigned long)SymbolValue(STATIC_SPACE_FREE_POINTER));
printf("RDONLY\t=\t0x%08lx\n",
(unsigned long)SymbolValue(READ_ONLY_SPACE_FREE_POINTER));
#endif /* 0 */
#ifdef MIPS
printf("FLAGS\t=\t0x%08x\n", current_flags_register);
#endif
}
static void
search_cmd(char **ptr)
{
static int lastval = 0, lastcount = 0;
static lispobj *start = 0, *end = 0;
int val, count;
lispobj *addr, obj;
if (more_p(ptr)) {
val = parse_number(ptr);
if (val < 0 || val > 0xff) {
printf("can only search for single bytes\n");
return;
}
if (more_p(ptr)) {
addr = (lispobj *)native_pointer((long)parse_addr(ptr));
if (more_p(ptr)) {
count = parse_number(ptr);
}
else {
/* Specified value and address, but no count. Only one. */
count = -1;
}
}
else {
/* Specified a value, but no address, so search same range. */
addr = start;
count = lastcount;
}
}
else {
/* Specified nothing, search again for val. */
val = lastval;
addr = end;
count = lastcount;
}
lastval = val;
start = end = addr;
lastcount = count;
printf("searching for 0x%x at 0x%08lX\n", val, (unsigned long)end);
while (search_for_type(val, &end, &count)) {
printf("found 0x%x at 0x%08lX:\n", val, (unsigned long)end);
obj = *end;
addr = end;
end += 2;
if (widetag_of(obj) == SIMPLE_FUN_HEADER_WIDETAG) {
print((long)addr | FUN_POINTER_LOWTAG);
} else if (lowtag_of(obj) == OTHER_IMMEDIATE_0_LOWTAG ||
lowtag_of(obj) == OTHER_IMMEDIATE_1_LOWTAG) {
print((lispobj)addr | OTHER_POINTER_LOWTAG);
} else {
print((lispobj)addr);
} if (count == -1) {
return;
}
}
}
/* (There used to be call_cmd() here, to call known-at-cold-init-time
* Lisp functions from ldb, but it bitrotted and was deleted in
* sbcl-0.7.5.1. See older CVS versions if you want to resuscitate
* it.) */
static void
flush_cmd(char **ptr)
{
flush_vars();
}
static void
quit_cmd(char **ptr)
{
char buf[10];
printf("Really quit? [y] ");
fflush(stdout);
fgets(buf, sizeof(buf), ldb_in);
if (buf[0] == 'y' || buf[0] == 'Y' || buf[0] == '\n')
exit(1);
}
static void
help_cmd(char **ptr)
{
struct cmd *cmd;
for (cmd = supported_cmds; cmd->cmd != NULL; cmd++)
if (cmd->help != NULL)
printf("%s\t%s\n", cmd->cmd, cmd->help);
}
static int done;
static void
exit_cmd(char **ptr)
{
done = 1;
}
static void
purify_cmd(char **ptr)
{
purify(NIL, NIL);
}
static void
print_context(os_context_t *context)
{
int i;
for (i = 0; i < NREGS; i++) {
printf("%s:\t", lisp_register_names[i]);
#ifdef __i386__
brief_print((lispobj)(*os_context_register_addr(context,
i*2)));
#else
brief_print((lispobj)(*os_context_register_addr(context,i)));
#endif
}
#ifdef DARWIN
printf("DAR:\t\t 0x%08lx\n", (unsigned long)(*os_context_register_addr(context, 41)));
printf("DSISR:\t\t 0x%08lx\n", (unsigned long)(*os_context_register_addr(context, 42)));
#endif
printf("PC:\t\t 0x%08lx\n",
(unsigned long)(*os_context_pc_addr(context)));
}
static void
print_context_cmd(char **ptr)
{
int free;
struct thread *thread=arch_os_get_current_thread();
free = SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,thread)>>2;
if (more_p(ptr)) {
int index;
index = parse_number(ptr);
if ((index >= 0) && (index < free)) {
printf("There are %d interrupt contexts.\n", free);
printf("printing context %d\n", index);
print_context(thread->interrupt_contexts[index]);
} else {
printf("There aren't that many/few contexts.\n");
printf("There are %d interrupt contexts.\n", free);
}
} else {
if (free == 0)
printf("There are no interrupt contexts!\n");
else {
printf("There are %d interrupt contexts.\n", free);
printf("printing context %d\n", free - 1);
print_context(thread->interrupt_contexts[free - 1]);
}
}
}
static void
backtrace_cmd(char **ptr)
{
void backtrace(int frames);
int n;
if (more_p(ptr))
n = parse_number(ptr);
else
n = 100;
printf("Backtrace:\n");
backtrace(n);
}
static void
catchers_cmd(char **ptr)
{
struct catch_block *catch;
struct thread *thread=arch_os_get_current_thread();
catch = (struct catch_block *)SymbolValue(CURRENT_CATCH_BLOCK,thread);
if (catch == NULL)
printf("There are no active catchers!\n");
else {
while (catch != NULL) {
#ifndef __i386__
printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
(unsigned long)catch, (unsigned long)(catch->current_uwp),
(unsigned long)(catch->current_cont),
catch->current_code,
catch->entry_pc);
#else
printf("0x%08lX:\n\tuwp: 0x%08lX\n\tfp: 0x%08lX\n\tcode: 0x%08lx\n\tentry: 0x%08lx\n\ttag: ",
(unsigned long)catch, (unsigned long)(catch->current_uwp),
(unsigned long)(catch->current_cont),
(unsigned long)component_ptr_from_pc((void*)catch->entry_pc) +
OTHER_POINTER_LOWTAG,
(unsigned long)catch->entry_pc);
#endif
brief_print((lispobj)catch->tag);
catch = catch->previous_catch;
}
}
}
static void
grab_sigs_cmd(char **ptr)
{
extern void sigint_init(void);
printf("Grabbing signals.\n");
sigint_init();
}
static void
sub_monitor(void)
{
struct cmd *cmd, *found;
char buf[256];
char *line, *ptr, *token;
int ambig;
if (!ldb_in) {
ldb_in = fopen("/dev/tty","r+");
ldb_in_fd = fileno(ldb_in);
}
while (!done) {
printf("ldb> ");
fflush(stdout);
line = fgets(buf, sizeof(buf), ldb_in);
if (line == NULL) {
if (isatty(ldb_in_fd)) {
putchar('\n');
continue;
}
else {
fprintf(stderr, "\nEOF on something other than a tty.\n");
exit(0);
}
}
ptr = line;
if ((token = parse_token(&ptr)) == NULL)
continue;
ambig = 0;
found = NULL;
for (cmd = supported_cmds; cmd->cmd != NULL; cmd++) {
if (strcmp(token, cmd->cmd) == 0) {
found = cmd;
ambig = 0;
break;
}
else if (strncmp(token, cmd->cmd, strlen(token)) == 0) {
if (found)
ambig = 1;
else
found = cmd;
}
}
if (ambig)
printf("``%s'' is ambiguous.\n", token);
else if (found == NULL)
printf("unknown command: ``%s''\n", token);
else {
reset_printer();
(*found->fn)(&ptr);
}
}
}
void
ldb_monitor()
{
jmp_buf oldbuf;
bcopy(curbuf, oldbuf, sizeof(oldbuf));
printf("LDB monitor\n");
setjmp(curbuf);
sub_monitor();
done = 0;
bcopy(oldbuf, curbuf, sizeof(curbuf));
}
void
throw_to_monitor()
{
longjmp(curbuf, 1);
}
#endif /* defined(LISP_FEATURE_SB_LDB) */
/* what we do when things go badly wrong at a low level */
void
monitor_or_something()
{
#if defined(LISP_FEATURE_SB_LDB)
ldb_monitor();
#else
fprintf(stderr, "There's no LDB in this build; exiting.\n");
exit(1);
#endif
}