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From: Julian Dolby <dolby@csag-226-8.UCSD.EDU> Enclosed below are diffs against the cvs repository as of Feb 12; aside from minor changes like using different include files (e.g. validate.h instead of x86-validate.h in Linux-os.c) and adding alpha-linux specifics unix-glibc2.lisp, there are two code changes. The first is to signal handling. I had to put the POSIX-SIGS ifdefs into places used by alpha but not by x86, and I ifdef'ed out most of the linux #define kludges for signals for alpha linux, since alpha linux uses OSF/1 signals rather than linux ones. The second is that the trick of or'ing 2 into the reg_ALLOC address to cause faults does not work on alpha linux since the kernel traps and handles the unaligned access; I did not find a way to change that kernel behavior, so I changed the code to or (1<<63) into the address to cause a seg fault, and then check, in the seg fault handler, to see if the high-order address bits are set. One change I made is to the memory layout (lisp/alpha-validate.h and compiler/alpha/parms.lisp); that change is not needed to make lisp run on alpha linux, but is there because I wanted more heap space.
pw authoredFrom: Julian Dolby <dolby@csag-226-8.UCSD.EDU> Enclosed below are diffs against the cvs repository as of Feb 12; aside from minor changes like using different include files (e.g. validate.h instead of x86-validate.h in Linux-os.c) and adding alpha-linux specifics unix-glibc2.lisp, there are two code changes. The first is to signal handling. I had to put the POSIX-SIGS ifdefs into places used by alpha but not by x86, and I ifdef'ed out most of the linux #define kludges for signals for alpha linux, since alpha linux uses OSF/1 signals rather than linux ones. The second is that the trick of or'ing 2 into the reg_ALLOC address to cause faults does not work on alpha linux since the kernel traps and handles the unaligned access; I did not find a way to change that kernel behavior, so I changed the code to or (1<<63) into the address to cause a seg fault, and then check, in the seg fault handler, to see if the high-order address bits are set. One change I made is to the memory layout (lisp/alpha-validate.h and compiler/alpha/parms.lisp); that change is not needed to make lisp run on alpha linux, but is there because I wanted more heap space.
monitor.c 11.99 KiB
/* $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/monitor.c,v 1.10 1999/02/20 15:54:44 pw Exp $ */
#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 "lisp.h"
#include "internals.h"
#include "globals.h"
#include "vars.h"
#include "parse.h"
#include "os.h"
#include "interrupt.h"
#include "lispregs.h"
#include "monitor.h"
#include "print.h"
#include "arch.h"
#include "gc.h"
#include "search.h"
#include "purify.h"
extern boolean isatty(int fd);
typedef void cmd(char **ptr);
static cmd call_cmd, dump_cmd, print_cmd, quit, help;
static cmd flush_cmd, search_cmd, regs_cmd, exit_cmd;
static cmd gc_cmd, print_context_cmd;
static cmd backtrace_cmd, purify_cmd, catchers_cmd;
static cmd grab_sigs_cmd;
static struct cmd {
char *cmd, *help;
void (*fn)(char **ptr);
} Cmds[] = {
{"help", "Display this info", help},
{"?", NULL, help},
{"backtrace", "backtrace up to N frames", backtrace_cmd},
{"call", "call FUNCTION with ARG1, ARG2, ...", call_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", NULL, dump_cmd},
{"exit", "Exit this instance of the monitor.", exit_cmd},
{"flush", "flush all temp variables.", flush_cmd},
{"gc", "collect garbage (caveat collector).", gc_cmd},
{"grab-signals", "Set the signal handlers to call LDB.", grab_sigs_cmd},
{"purify", "purify (caveat purifier).", purify_cmd},
{"print", "print object at ADDRESS.", print_cmd},
{"p", NULL, print_cmd},
{"quit", "quit.", quit},
{"regs", "display current lisp regs.", regs_cmd},
{"search", "search for TYPE starting at ADDRESS for a max of COUNT words.", search_cmd},
{"s", NULL, search_cmd},
{NULL, NULL, NULL}
};
static jmp_buf curbuf;
static int visable(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 (valid_addr((os_vm_address_t)addr)) {
#ifndef alpha
unsigned long *lptr = (unsigned long *)addr;
#else
u32 *lptr = (unsigned long *)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], visable(cptr[0]), visable(cptr[1]), visable(cptr[2]), visable(cptr[3]));
}
else
printf("invalid address\n");
addr += displacement;
}
lastaddr = addr;
}
static void print_cmd(char **ptr)
{
lispobj obj = parse_lispobj(ptr);
print(obj);
}
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(ibmrt) && !defined(i386)
printf("BSP\t=\t0x%08X\n", (unsigned long)current_binding_stack_pointer);
#endif
#ifdef i386
printf("BSP\t=\t0x%08X\n", SymbolValue(BINDING_STACK_POINTER));
#endif
printf("DYNAMIC\t=\t0x%08lX\n", (unsigned long)current_dynamic_space);
#if defined(ibmrt) || defined(i386)
printf("ALLOC\t=\t0x%08lX\n", SymbolValue(ALLOCATION_POINTER));
printf("TRIGGER\t=\t0x%08lX\n", SymbolValue(INTERNAL_GC_TRIGGER));
#else
printf("ALLOC\t=\t0x%08X\n",
(unsigned long)current_dynamic_space_free_pointer);
printf("TRIGGER\t=\t0x%08X\n", (unsigned long)current_auto_gc_trigger);
#endif
printf("STATIC\t=\t0x%08lX\n", SymbolValue(STATIC_SPACE_FREE_POINTER));
printf("RDONLY\t=\t0x%08lX\n", SymbolValue(READ_ONLY_SPACE_FREE_POINTER));
#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 *)PTR((long)parse_addr(ptr));
if (more_p(ptr)) {
count = parse_number(ptr);
}
else {
/* Speced value and address, but no count. Only one. */
count = -1;
}
}
else {
/* Speced a value, but no address, so search same range. */
addr = start;
count = lastcount;
}
}
else {
/* Speced 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 (TypeOf(obj) == type_FunctionHeader)
print((long)addr | type_FunctionPointer);
else if (LowtagOf(obj) == type_OtherImmediate0 || LowtagOf(obj) == type_OtherImmediate1)
print((lispobj)addr | type_OtherPointer);
else
print((lispobj)addr);
if (count == -1)
return;
}
}
static void call_cmd(char **ptr)
{
lispobj thing = parse_lispobj(ptr), function, result, cons, args[3];
int numargs;
if (LowtagOf(thing) == type_OtherPointer) {
switch (TypeOf(*(lispobj *)(thing-type_OtherPointer))) {
case type_SymbolHeader:
for (cons = SymbolValue(INITIAL_FDEFN_OBJECTS);
cons != NIL;
cons = CONS(cons)->cdr) {
if (FDEFN(CONS(cons)->car)->name == thing) {
thing = CONS(cons)->car;
goto fdefn;
}
}
printf("symbol 0x%08lx is undefined.\n", thing);
return;
case type_Fdefn:
fdefn:
function = FDEFN(thing)->function;
if (function == NIL) {
printf("fdefn 0x%08lx is undefined.\n", thing);
return;
}
break;
default:
printf(
"0x%08lx is not a function pointer, symbol, or fdefn object.\n",
thing);
return;
}
}
else if (LowtagOf(thing) != type_FunctionPointer) {
printf("0x%08lx is not a function pointer, symbol, or fdefn object.\n",
thing);
return;
}
else
function = thing;
numargs = 0;
while (more_p(ptr)) {
if (numargs >= 3) {
printf("Too many arguments. 3 at most.\n");
return;
}
args[numargs++] = parse_lispobj(ptr);
}
switch (numargs) {
case 0:
result = funcall0(function);
break;
case 1:
result = funcall1(function, args[0]);
break;
case 2:
result = funcall2(function, args[0], args[1]);
break;
case 3:
result = funcall3(function, args[0], args[1], args[2]);
break;
}
print(result);
}
static void flush_cmd(char **ptr)
{
flush_vars();
}
static void quit(char **ptr)
{
char buf[10];
printf("Really quit? [y] ");
fflush(stdout);
fgets(buf, sizeof(buf), stdin);
if (buf[0] == 'y' || buf[0] == 'Y' || buf[0] == '\n')
exit(0);
}
static void help(char **ptr)
{
struct cmd *cmd;
for (cmd = 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 = TRUE;
}
static void gc_cmd(char **ptr)
{
collect_garbage();
}
static void purify_cmd(char **ptr)
{
purify(NIL, NIL);
}
static void print_context(struct sigcontext *context)
{
int i;
for (i = 0; i < NREGS; i++) {
printf("%s:\t", lisp_register_names[i]);
#ifdef i386
brief_print((lispobj) SC_REG(context, i*2));
#else
brief_print((lispobj) SC_REG(context, i));
#endif
}
printf("PC:\t\t 0x%08lx\n", SC_PC(context));
}
static void print_context_cmd(char **ptr)
{
int free;
free = SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX)>>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(lisp_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(lisp_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;
catch = (struct catch_block *)SymbolValue(CURRENT_CATCH_BLOCK);
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),
component_ptr_from_pc(catch->entry_pc) + type_OtherPointer,
catch->entry_pc);
#endif
brief_print((lispobj)catch->tag);
catch = (struct catch_block *) 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;
while (!done) {
printf("ldb> ");
fflush(stdout);
line = fgets(buf, sizeof(buf), stdin);
if (line == NULL) {
if (isatty(0)) {
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 = 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 = FALSE;
bcopy(oldbuf, curbuf, sizeof(curbuf));
}
void throw_to_monitor()
{
longjmp(curbuf, 1);
}