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crash/gdb_interface.c
Dave Anderson 698b34dc23 Fix for the built-in "g" alias, which apparently has not worked 
correctly since crash-5.1.4.  Without the patch, if the "g" alias
and the first argument are separated by one space, then the first
first character of that argument would get stripped prior to being
passed to the embedded gdb module.
(anderson@redhat.com)
2014-04-30 15:43:10 -04:00

1028 lines
27 KiB
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/* gdb_interface.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2014 David Anderson
* Copyright (C) 2002-2014 Red Hat, Inc. All rights reserved.
*
* 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.
*/
#include "defs.h"
static void exit_after_gdb_info(void);
static int is_restricted_command(char *, ulong);
static void strip_redirection(char *);
int get_frame_offset(ulong);
int *gdb_output_format;
unsigned int *gdb_print_max;
int *gdb_prettyprint_structs;
int *gdb_prettyprint_arrays;
int *gdb_repeat_count_threshold;
int *gdb_stop_print_at_null;
unsigned int *gdb_output_radix;
static ulong gdb_user_print_option_address(char *);
/*
* Called from main() this routine sets up the call-back hook such that
* gdb's main() routine -- renamed gdb_main() -- will call back to
* our main_loop() after gdb initializes.
*/
void
gdb_main_loop(int argc, char **argv)
{
argc = 1;
if (pc->flags & SILENT) {
if (pc->flags & READNOW)
argv[argc++] = "--readnow";
argv[argc++] = "--quiet";
argv[argc++] = pc->namelist_debug ?
pc->namelist_debug :
(pc->debuginfo_file && (st->flags & CRC_MATCHES) ?
pc->debuginfo_file : pc->namelist);
} else {
if (pc->flags & READNOW)
argv[argc++] = "--readnow";
argv[argc++] = pc->namelist_debug ?
pc->namelist_debug :
(pc->debuginfo_file && (st->flags & CRC_MATCHES) ?
pc->debuginfo_file : pc->namelist);
}
if (CRASHDEBUG(1)) {
int i;
fprintf(fp, "gdb ");
for (i = 1; i < argc; i++)
fprintf(fp, "%s ", argv[i]);
fprintf(fp, "\n");
}
optind = 0;
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = main_loop;
#else
deprecated_command_loop_hook = main_loop;
#endif
gdb_main_entry(argc, argv);
}
/*
* Update any hooks that gdb has set.
*/
void
update_gdb_hooks(void)
{
#if defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = pc->flags & VERSION_QUERY ?
exit_after_gdb_info : main_loop;
target_new_objfile_hook = NULL;
#endif
#if defined(GDB_7_0) || defined(GDB_7_3_1) || defined(GDB_7_6)
deprecated_command_loop_hook = pc->flags & VERSION_QUERY ?
exit_after_gdb_info : main_loop;
#endif
}
void
gdb_readnow_warning(void)
{
if ((THIS_GCC_VERSION >= GCC(3,4,0)) && (THIS_GCC_VERSION < GCC(4,0,0))
&& !(pc->flags & READNOW)) {
fprintf(stderr,
"WARNING: Because this kernel was compiled with gcc version %d.%d.%d, certain\n"
" commands or command options may fail unless crash is invoked with\n"
" the \"--readnow\" command line option.\n\n",
kt->gcc_version[0],
kt->gcc_version[1],
kt->gcc_version[2]);
}
}
/*
* Used only by the -v command line option, get gdb to initialize itself
* with no arguments, print its version and GPL paragraph, and then call
* back to exit_after_gdb_info().
*/
void
display_gdb_banner(void)
{
optind = 0;
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = exit_after_gdb_info;
#else
deprecated_command_loop_hook = exit_after_gdb_info;
#endif
args[0] = "gdb";
args[1] = "-version";
gdb_main_entry(2, args);
}
static void
exit_after_gdb_info(void)
{
fprintf(fp, "\n");
clean_exit(0);
}
/*
* Stash a copy of the gdb version locally. This can be called before
* gdb gets initialized, so bypass gdb_interface().
*/
void
get_gdb_version(void)
{
struct gnu_request request;
if (!pc->gdb_version) {
request.command = GNU_VERSION;
gdb_command_funnel(&request); /* bypass gdb_interface() */
pc->gdb_version = request.buf;
}
}
void
gdb_session_init(void)
{
struct gnu_request *req;
int debug_data_pulled_in;
if (!have_partial_symbols() && !have_full_symbols())
no_debugging_data(FATAL);
/*
* Restore the SIGINT and SIGPIPE handlers, which got temporarily
* re-assigned by gdb. The SIGINT call also initializes GDB's
* SIGINT sigaction.
*/
SIGACTION(SIGINT, restart, &pc->sigaction, &pc->gdb_sigaction);
SIGACTION(SIGPIPE, SIG_IGN, &pc->sigaction, NULL);
if (!(pc->flags & DROP_CORE))
SIGACTION(SIGSEGV, restart, &pc->sigaction, NULL);
/*
* Set up pointers to gdb variables.
*/
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
gdb_output_format = &output_format;
gdb_print_max = &print_max;
gdb_prettyprint_structs = &prettyprint_structs;
gdb_prettyprint_arrays = &prettyprint_arrays;
gdb_repeat_count_threshold = &repeat_count_threshold;
gdb_stop_print_at_null = &stop_print_at_null;
gdb_output_radix = &output_radix;
#else
gdb_output_format = (int *)
gdb_user_print_option_address("output_format");
gdb_print_max = (unsigned int *)
gdb_user_print_option_address("print_max");
gdb_prettyprint_structs = (int *)
gdb_user_print_option_address("prettyprint_structs");
gdb_prettyprint_arrays = (int *)
gdb_user_print_option_address("prettyprint_arrays");
gdb_repeat_count_threshold = (int *)
gdb_user_print_option_address("repeat_count_threshold");
gdb_stop_print_at_null = (int *)
gdb_user_print_option_address("stop_print_at_null");
gdb_output_radix = (unsigned int *)
gdb_user_print_option_address("output_radix");
#endif
/*
* If the output radix is set via the --hex or --dec command line
* option, then pc->output_radix will be non-zero; otherwise use
* the gdb default.
*/
if (pc->output_radix) {
*gdb_output_radix = pc->output_radix;
*gdb_output_format = (*gdb_output_radix == 10) ? 0 : 'x';
}
switch (*gdb_output_radix)
{
case 10:
case 16:
pc->output_radix = *gdb_output_radix;
break;
default:
pc->output_radix = *gdb_output_radix = 10;
*gdb_output_format = 0;
}
*gdb_prettyprint_structs = 1;
*gdb_repeat_count_threshold = 0x7fffffff;
*gdb_print_max = 256;
#ifdef GDB_5_3
gdb_disassemble_from_exec = 0;
#endif
pc->flags |= GDB_INIT; /* set here so gdb_interface will work */
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = GETBUF(BUFSIZE);
/*
* Make sure the namelist has symbolic data. Later versions of
* gcc may require that debug data be pulled in by printing a
* static kernel data structure.
*/
debug_data_pulled_in = FALSE;
retry:
BZERO(req->buf, BUFSIZE);
req->command = GNU_GET_DATATYPE;
req->name = XEN_HYPER_MODE() ? "page_info" : "task_struct";
req->flags = GNU_RETURN_ON_ERROR;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED) {
if (XEN_HYPER_MODE())
no_debugging_data(WARNING); /* just bail out */
if (!debug_data_pulled_in) {
if (CRASHDEBUG(1))
error(INFO,
"gdb_session_init: pulling in debug data by accessing init_mm.mmap %s\n",
symbol_exists("sysfs_mount") ?
"and syfs_mount" : "");
debug_data_pulled_in = TRUE;
req->command = GNU_PASS_THROUGH;
req->flags = GNU_RETURN_ON_ERROR|GNU_NO_READMEM;
req->name = NULL;
if (symbol_exists("sysfs_mount"))
sprintf(req->buf, "print sysfs_mount, init_mm.mmap");
else
sprintf(req->buf, "print init_mm.mmap");
gdb_interface(req);
if (!(req->flags & GNU_COMMAND_FAILED))
goto retry;
}
no_debugging_data(WARNING);
}
if (pc->flags & KERNEL_DEBUG_QUERY) {
fprintf(fp, "\n%s: %s: contains debugging data\n\n",
pc->program_name, pc->namelist);
if (REMOTE())
remote_exit();
clean_exit(0);
}
/*
* Set up any pre-ordained gdb settings here that can't be
* accessed directly.
*/
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set height 0");
gdb_interface(req);
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set width 0");
gdb_interface(req);
/*
* Patch gdb's symbol values with the correct values from either
* the System.map or non-debug vmlinux, whichever is in effect.
*/
if ((pc->flags & SYSMAP) || (kt->flags & (RELOC_SET|RELOC_FORCE)) ||
(pc->namelist_debug && !pc->debuginfo_file)) {
req->command = GNU_PATCH_SYMBOL_VALUES;
req->flags = GNU_RETURN_ON_ERROR;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED)
error(FATAL, "patching of gdb symbol values failed\n");
} else if (!(pc->flags & SILENT))
fprintf(fp, "\n");
FREEBUF(req->buf);
FREEBUF(req);
}
/*
* Quickest way to gdb -- just pass a command string to pass through.
*/
int
gdb_pass_through(char *cmd, FILE *fptr, ulong flags)
{
struct gnu_request *req;
int retval;
if (CRASHDEBUG(1))
console("gdb_pass_through: [%s]\n", cmd);
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = cmd;
if (fptr)
req->fp = fptr;
req->command = GNU_PASS_THROUGH;
req->flags = flags;
gdb_interface(req);
if ((req->flags & (GNU_RETURN_ON_ERROR|GNU_COMMAND_FAILED)) ==
(GNU_RETURN_ON_ERROR|GNU_COMMAND_FAILED))
retval = FALSE;
else
retval = TRUE;
FREEBUF(req);
return retval;
}
/*
* General purpose routine for passing commands to gdb. All gdb commands
* come through here, where they are passed to gdb_command_funnel().
*/
void
gdb_interface(struct gnu_request *req)
{
if (!(pc->flags & GDB_INIT))
error(FATAL, "gdb_interface: gdb not initialized?\n");
if (output_closed())
restart(0);
if (!req->fp) {
req->fp = ((pc->flags & RUNTIME) || (pc->flags2 & ALLOW_FP)) ?
fp : CRASHDEBUG(1) ? fp : pc->nullfp;
}
pc->cur_req = req;
pc->cur_gdb_cmd = req->command;
if (req->flags & GNU_RETURN_ON_ERROR) {
error_hook = gdb_error_hook;
if (setjmp(pc->gdb_interface_env)) {
pc->last_gdb_cmd = pc->cur_gdb_cmd;
pc->cur_gdb_cmd = 0;
pc->cur_req = NULL;
req->flags |= GNU_COMMAND_FAILED;
pc->flags &= ~IN_GDB;
return;
}
} else
error_hook = NULL;
if (CRASHDEBUG(2))
dump_gnu_request(req, IN_GDB);
if (!(pc->flags & DROP_CORE))
SIGACTION(SIGSEGV, restart, &pc->sigaction, NULL);
else
SIGACTION(SIGSEGV, SIG_DFL, &pc->sigaction, NULL);
if (interruptible()) {
SIGACTION(SIGINT, pc->gdb_sigaction.sa_handler,
&pc->gdb_sigaction, NULL);
} else {
SIGACTION(SIGINT, SIG_IGN, &pc->sigaction, NULL);
SIGACTION(SIGPIPE, SIG_IGN, &pc->sigaction, NULL);
}
pc->flags |= IN_GDB;
gdb_command_funnel(req);
pc->flags &= ~IN_GDB;
SIGACTION(SIGINT, restart, &pc->sigaction, NULL);
SIGACTION(SIGSEGV, SIG_DFL, &pc->sigaction, NULL);
if (CRASHDEBUG(2))
dump_gnu_request(req, !IN_GDB);
error_hook = NULL;
pc->last_gdb_cmd = pc->cur_gdb_cmd;
pc->cur_gdb_cmd = 0;
pc->cur_req = NULL;
}
/*
* help -g output
*/
void
dump_gdb_data(void)
{
fprintf(fp, " prettyprint_arrays: %d\n", *gdb_prettyprint_arrays);
fprintf(fp, " prettyprint_structs: %d\n", *gdb_prettyprint_structs);
fprintf(fp, "repeat_count_threshold: %x\n", *gdb_repeat_count_threshold);
fprintf(fp, " stop_print_at_null: %d\n", *gdb_stop_print_at_null);
fprintf(fp, " print_max: %d\n", *gdb_print_max);
fprintf(fp, " output_radix: %d\n", *gdb_output_radix);
fprintf(fp, " output_format: ");
switch (*gdb_output_format)
{
case 'x':
fprintf(fp, "hex\n"); break;
case 'o':
fprintf(fp, "octal\n"); break;
case 0:
fprintf(fp, "decimal\n"); break;
}
}
void
dump_gnu_request(struct gnu_request *req, int in_gdb)
{
int others;
char buf[BUFSIZE];
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
console("%scommand: %d (%s)\n", in_gdb ? "GDB IN: " : "GDB OUT: ",
req->command, gdb_command_string(req->command, buf, TRUE));
console("buf: %lx ", req->buf);
if (req->buf && ascii_string(req->buf))
console(" \"%s\"", req->buf);
console("\n");
console("fp: %lx ", req->fp);
if (req->fp == pc->nullfp)
console("(pc->nullfp) ");
if (req->fp == pc->stdpipe)
console("(pc->stdpipe) ");
if (req->fp == pc->pipe)
console("(pc->pipe) ");
if (req->fp == pc->ofile)
console("(pc->ofile) ");
if (req->fp == pc->ifile)
console("(pc->ifile) ");
if (req->fp == pc->ifile_pipe)
console("(pc->ifile_pipe) ");
if (req->fp == pc->ifile_ofile)
console("(pc->ifile_ofile) ");
if (req->fp == pc->tmpfile)
console("(pc->tmpfile) ");
if (req->fp == pc->saved_fp)
console("(pc->saved_fp) ");
if (req->fp == pc->tmp_fp)
console("(pc->tmp_fp) ");
console("flags: %lx (", req->flags);
others = 0;
if (req->flags & GNU_PRINT_LINE_NUMBERS)
console("%sGNU_PRINT_LINE_NUMBERS", others++ ? "|" : "");
if (req->flags & GNU_FUNCTION_ONLY)
console("%sGNU_FUNCTION_ONLY", others++ ? "|" : "");
if (req->flags & GNU_PRINT_ENUMERATORS)
console("%sGNU_PRINT_ENUMERATORS", others++ ? "|" : "");
if (req->flags & GNU_RETURN_ON_ERROR)
console("%sGNU_RETURN_ON_ERROR", others++ ? "|" : "");
if (req->flags & GNU_FROM_TTY_OFF)
console("%sGNU_FROM_TTY_OFF", others++ ? "|" : "");
if (req->flags & GNU_NO_READMEM)
console("%sGNU_NO_READMEM", others++ ? "|" : "");
if (req->flags & GNU_VAR_LENGTH_TYPECODE)
console("%sGNU_VAR_LENGTH_TYPECODE", others++ ? "|" : "");
console(")\n");
console("addr: %lx ", req->addr);
console("addr2: %lx ", req->addr2);
console("count: %ld\n", req->count);
if ((ulong)req->name > (ulong)PATCH_KERNEL_SYMBOLS_STOP)
console("name: \"%s\" ", req->name);
else
console("name: %lx ", (ulong)req->name);
console("length: %ld ", req->length);
console("typecode: %d\n", req->typecode);
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1) || defined(GDB_7_0)
console("typename: %s\n", req->typename);
#else
console("type_name: %s\n", req->type_name);
#endif
console("target_typename: %s\n", req->target_typename);
console("target_length: %ld ", req->target_length);
console("target_typecode: %d ", req->target_typecode);
console("is_typedef: %d ", req->is_typedef);
console("member: \"%s\" ", req->member);
console("member_offset: %ld\n", req->member_offset);
console("member_length: %ld\n", req->member_length);
console("member_typecode: %d\n", req->member_typecode);
console("value: %lx ", req->value);
console("tagname: \"%s\" ", req->tagname);
console("pc: %lx ", req->pc);
if (is_kernel_text(req->pc))
console("(%s)", value_to_symstr(req->pc, buf, 0));
console("\n");
console("sp: %lx ", req->sp);
console("ra: %lx ", req->ra);
console("frame: %ld ", req->frame);
console("prevsp: %lx\n", req->prevsp);
console("prevpc: %lx ", req->prevpc);
console("lastsp: %lx ", req->lastsp);
console("task: %lx ", req->task);
console("debug: %lx\n", req->debug);
console("\n");
}
char *
gdb_command_string(int cmd, char *buf, int live)
{
switch (cmd)
{
case GNU_PASS_THROUGH:
sprintf(buf, "GNU_PASS_THROUGH");
break;
case GNU_DATATYPE_INIT:
sprintf(buf, "GNU_DATATYPE_INIT");
break;
case GNU_DISASSEMBLE:
sprintf(buf, "GNU_DISASSEMBLE");
break;
case GNU_GET_LINE_NUMBER:
sprintf(buf, "GNU_GET_LINE_NUMBER");
break;
case GNU_GET_DATATYPE:
if (live)
sprintf(buf, "GNU_GET_DATATYPE[%s]",
pc->cur_req->name ? pc->cur_req->name : "?");
else
sprintf(buf, "GNU_GET_DATATYPE");
break;
case GNU_STACK_TRACE:
sprintf(buf, "GNU_STACK_TRACE");
break;
case GNU_ALPHA_FRAME_OFFSET:
sprintf(buf, "GNU_ALPHA_FRAME_OFFSET");
break;
case GNU_COMMAND_EXISTS:
sprintf(buf, "GNU_COMMAND_EXISTS");
break;
case GNU_FUNCTION_NUMARGS:
sprintf(buf, "GNU_FUNCTION_NUMARGS");
break;
case GNU_RESOLVE_TEXT_ADDR:
sprintf(buf, "GNU_RESOLVE_TEXT_ADDR");
break;
case GNU_DEBUG_COMMAND:
sprintf(buf, "GNU_DEBUG_COMMAND");
break;
case GNU_ADD_SYMBOL_FILE:
sprintf(buf, "GNU_ADD_SYMBOL_FILE");
break;
case GNU_DELETE_SYMBOL_FILE:
sprintf(buf, "GNU_DELETE_SYMBOL_FILE");
break;
case GNU_VERSION:
sprintf(buf, "GNU_VERSION");
break;
case GNU_GET_SYMBOL_TYPE:
sprintf(buf, "GNU_GET_SYMBOL_TYPE");
break;
case GNU_PATCH_SYMBOL_VALUES:
sprintf(buf, "GNU_PATCH_SYMBOL_VALUES");
break;
case GNU_USER_PRINT_OPTION:
sprintf(buf, "GNU_USER_PRINT_OPTION");
break;
case GNU_SET_CRASH_BLOCK:
sprintf(buf, "GNU_SET_CRASH_BLOCK");
break;
case 0:
buf[0] = NULLCHAR;
break;
default:
sprintf(buf, "(?)\n");
break;
}
return buf;
}
/*
* Restore known gdb state.
*/
void
restore_gdb_sanity(void)
{
if (!(pc->flags & GDB_INIT))
return;
if (pc->output_radix) {
*gdb_output_radix = pc->output_radix;
*gdb_output_format = (*gdb_output_radix == 10) ? 0 : 'x';
}
*gdb_prettyprint_structs = 1; /* these may piss somebody off... */
*gdb_repeat_count_threshold = 0x7fffffff;
error_hook = NULL;
if (st->flags & ADD_SYMBOL_FILE) {
error(INFO,
"%s\n gdb add-symbol-file command failed\n",
st->current->mod_namelist);
delete_load_module(st->current->mod_base);
st->flags &= ~ADD_SYMBOL_FILE;
}
if (pc->cur_gdb_cmd) {
pc->last_gdb_cmd = pc->cur_gdb_cmd;
pc->cur_gdb_cmd = 0;
}
}
/*
* Check whether string in args[0] is a valid gdb command.
*/
int
is_gdb_command(int merge_orig_args, ulong flags)
{
int retval;
struct gnu_request *req;
if (!args[0])
return FALSE;
if (STREQ(args[0], "Q")) {
args[0] = "q";
return TRUE;
}
if (is_restricted_command(args[0], flags))
return FALSE;
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = GETBUF(strlen(args[0])+1);
req->command = GNU_COMMAND_EXISTS;
req->name = args[0];
req->flags = GNU_RETURN_ON_ERROR;
req->fp = pc->nullfp;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED)
retval = FALSE;
else
retval = req->value;
FREEBUF(req->buf);
FREEBUF(req);
if (retval && merge_orig_args) {
int i;
for (i = argcnt; i; i--)
args[i] = args[i-1];
args[0] = "gdb";
argcnt++;
}
return retval;
}
/*
* Check whether a command is on the gdb-prohibited list.
*/
static char *prohibited_list[] = {
"run", "r", "break", "b", "tbreak", "hbreak", "thbreak", "rbreak",
"watch", "rwatch", "awatch", "attach", "continue", "c", "fg", "detach",
"finish", "handle", "interrupt", "jump", "kill", "next", "nexti",
"signal", "step", "s", "stepi", "target", "thread", "until", "delete",
"clear", "disable", "enable", "condition", "ignore", "frame",
"select-frame", "f", "up", "down", "catch", "tcatch", "return",
"file", "exec-file", "core-file", "symbol-file", "load", "si", "ni",
"shell",
NULL /* must be last */
};
static char *restricted_list[] = {
"define", "document", "while", "if",
NULL /* must be last */
};
#define RESTRICTED_GDB_COMMAND \
"restricted gdb command: %s\n%s\"%s\" may only be used in a .gdbinit file or in a command file.\n%sThe .gdbinit file is read automatically during %s initialization.\n%sOther user-defined command files may be read interactively during\n%s%s runtime by using the gdb \"source\" command.\n"
static int
is_restricted_command(char *cmd, ulong flags)
{
int i;
char *newline;
for (i = 0; prohibited_list[i]; i++) {
if (STREQ(prohibited_list[i], cmd)) {
if (flags == RETURN_ON_ERROR)
return TRUE;
pc->curcmd = pc->program_name;
error(FATAL, "prohibited gdb command: %s\n", cmd);
}
}
for (i = 0; restricted_list[i]; i++) {
if (STREQ(restricted_list[i], cmd)) {
if (flags == RETURN_ON_ERROR)
return TRUE;
newline = space(strlen(pc->program_name)+2);
pc->curcmd = pc->program_name;
error(FATAL, RESTRICTED_GDB_COMMAND,
cmd, newline, cmd,
newline, pc->program_name,
newline, newline, pc->program_name);
}
}
return FALSE;
}
/*
* Remove pipe/redirection stuff from the end of the command line.
*/
static void
strip_redirection(char *buf)
{
char *p1, *p2;
p1 = strstr_rightmost(buf, args[argcnt-1]);
p2 = p1 + strlen(args[argcnt-1]);
console("strip_redirection: [%s]\n", p2);
if ((p1 = strpbrk(p2, "|!>")))
*p1 = NULLCHAR;
strip_ending_whitespace(buf);
}
/*
* Command for passing strings directly to gdb.
*/
void
cmd_gdb(void)
{
char buf[BUFSIZE];
char **argv;
argv = STREQ(args[0], "gdb") ? &args[1] : &args[0];
if (*argv == NULL)
cmd_usage(pc->curcmd, SYNOPSIS);
if (STREQ(*argv, "set") && argv[1]) {
/*
* Intercept set commands in case something has to be done
* here or elsewhere.
*/
if (STREQ(argv[1], "gdb")) {
cmd_set();
return;
}
if (STREQ(argv[1], "output-radix") && argv[2])
pc->output_radix = stol(argv[2], FAULT_ON_ERROR, NULL);
}
/*
* If the command is not restricted, pass it on.
*/
if (!is_restricted_command(*argv, FAULT_ON_ERROR)) {
if (STREQ(pc->command_line, "gdb")) {
strcpy(buf, first_space(pc->orig_line));
strip_beginning_whitespace(buf);
} else
strcpy(buf, pc->orig_line);
if (pc->redirect & (REDIRECT_TO_FILE|REDIRECT_TO_PIPE))
strip_redirection(buf);
if (!gdb_pass_through(buf, NULL, GNU_RETURN_ON_ERROR))
error(INFO, "gdb request failed: %s\n", buf);
}
}
/*
* The gdb target_xfer_memory() has a hook installed to re-route
* all memory accesses back here; reads of 1 or 4 bytes come primarily
* from text disassembly requests, and are diverted to the text cache.
*/
int
gdb_readmem_callback(ulong addr, void *buf, int len, int write)
{
char locbuf[SIZEOF_32BIT], *p1;
uint32_t *p2;
int memtype;
if (write)
return FALSE;
if (pc->cur_req->flags & GNU_NO_READMEM)
return TRUE;
if (pc->curcmd_flags & MEMTYPE_UVADDR)
memtype = UVADDR;
else if (pc->curcmd_flags & MEMTYPE_FILEADDR)
memtype = FILEADDR;
else if (!IS_KVADDR(addr)) {
if (STREQ(pc->curcmd, "gdb") &&
STRNEQ(pc->cur_req->buf, "x/")) {
memtype = UVADDR;
} else {
if (CRASHDEBUG(1))
console("gdb_readmem_callback: %lx %d FAILED\n",
addr, len);
return FALSE;
}
} else
memtype = KVADDR;
if (CRASHDEBUG(1))
console("gdb_readmem_callback[%d]: %lx %d\n",
memtype, addr, len);
if (memtype == FILEADDR)
return(readmem(pc->curcmd_private, memtype, buf, len,
"gdb_readmem_callback", RETURN_ON_ERROR));
switch (len)
{
case SIZEOF_8BIT:
p1 = (char *)buf;
if ((memtype == KVADDR) &&
text_value_cache_byte(addr, (unsigned char *)p1))
return TRUE;
if (!readmem(addr, memtype, locbuf, SIZEOF_32BIT,
"gdb_readmem_callback", RETURN_ON_ERROR))
return FALSE;
*p1 = locbuf[0];
if (memtype == KVADDR) {
p2 = (uint32_t *)locbuf;
text_value_cache(addr, *p2, 0);
}
return TRUE;
case SIZEOF_32BIT:
if ((memtype == KVADDR) && text_value_cache(addr, 0, buf))
return TRUE;
if (!readmem(addr, memtype, buf, SIZEOF_32BIT,
"gdb_readmem callback", RETURN_ON_ERROR))
return FALSE;
if (memtype == KVADDR)
text_value_cache(addr,
(uint32_t)*((uint32_t *)buf), NULL);
return TRUE;
}
return(readmem(addr, memtype, buf, len,
"gdb_readmem_callback", RETURN_ON_ERROR));
}
/*
* Machine-specific line-number pc section range verifier.
*/
int
gdb_line_number_callback(ulong pc, ulong low, ulong high)
{
if (machdep->verify_line_number)
return machdep->verify_line_number(pc, low, high);
return TRUE;
}
/*
* Prevent gdb from trying to translate and print pointers
* that are not kernel virtual addresses.
*/
int
gdb_print_callback(ulong addr)
{
if (!addr)
return FALSE;
else
return IS_KVADDR(addr);
}
/*
* Used by gdb_interface() to catch gdb-related errors, if desired.
*/
void
gdb_error_hook(void)
{
char buf1[BUFSIZE];
char buf2[BUFSIZE];
int buffers;
if (CRASHDEBUG(2)) {
sprintf(buf2, "\n");
if (CRASHDEBUG(5) && (buffers = get_embedded()))
sprintf(buf2, "(%d buffer%s in use)\n",
buffers, buffers > 1 ? "s" : "");
fprintf(stderr, "%s: returned via gdb_error_hook %s",
gdb_command_string(pc->cur_gdb_cmd, buf1, TRUE), buf2);
console("%s: returned via gdb_error_hook %s",
gdb_command_string(pc->cur_gdb_cmd, buf1, TRUE), buf2);
}
#ifdef GDB_7_6
do_cleanups(all_cleanups());
#else
do_cleanups(NULL);
#endif
longjmp(pc->gdb_interface_env, 1);
}
/*
* gdb callback to access debug mode.
*/
int
gdb_CRASHDEBUG(ulong dval)
{
if (CRASHDEBUG(dval))
return TRUE;
return (pc->cur_req && (pc->cur_req->debug >= dval));
}
static ulong
gdb_user_print_option_address(char *name)
{
struct gnu_request request;
request.command = GNU_USER_PRINT_OPTION;
request.name = name;
gdb_command_funnel(&request);
return request.addr;
}
/*
* Try to set a crash scope block based upon the vaddr.
*/
int
gdb_set_crash_scope(ulong vaddr, char *arg)
{
struct gnu_request request, *req = &request;
char name[BUFSIZE];
struct load_module *lm;
if (!is_kernel_text(vaddr)) {
error(INFO, "invalid text address: %s\n", arg);
return FALSE;
}
if (module_symbol(vaddr, NULL, &lm, name, 0)) {
if (!(lm->mod_flags & MOD_LOAD_SYMS)) {
error(INFO, "attempting to find/load \"%s\" module debuginfo\n",
lm->mod_name);
if (!load_module_symbols_helper(lm->mod_name)) {
error(INFO, "cannot find/load \"%s\" module debuginfo\n",
lm->mod_name);
return FALSE;
}
}
}
req->command = GNU_SET_CRASH_BLOCK;
req->addr = vaddr;
req->flags = 0;
req->addr2 = 0;
gdb_command_funnel(req);
if (CRASHDEBUG(1))
fprintf(fp,
"gdb_set_crash_scope: %s addr: %lx block: %lx\n",
req->flags & GNU_COMMAND_FAILED ? "FAILED" : "OK",
req->addr, req->addr2);
if (req->flags & GNU_COMMAND_FAILED) {
error(INFO,
"gdb cannot find text block for address: %s\n", arg);
return FALSE;
}
return TRUE;
}
#ifndef ALPHA
/*
* Stub routine needed for resolution by non-alpha, modified gdb code.
*/
int
get_frame_offset(ulong pc)
{
return (error(FATAL,
"get_frame_offset: invalid request for non-alpha systems!\n"));
}
#endif /* !ALPHA */
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