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gdb_interface.c
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gdb_interface.c
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/* gdb_interface.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2015,2018 David Anderson
* Copyright (C) 2002-2015,2018 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("member_main_type_name: %s\n", req->member_main_type_name);
console("member_main_type_tag_name: %s\n", req->member_main_type_tag_name);
console("member_target_type_name: %s\n", req->member_target_type_name);
console("member_target_type_tag_name: %s\n", req->member_target_type_tag_name);
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 GNU_GET_FUNCTION_RANGE:
sprintf(buf, "GNU_GET_FUNCTION_RANGE");
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);
}
}
if (kt->relocate &&
STRNEQ("disassemble", cmd) && STRNEQ(cmd, "disas"))
error(FATAL,
"the gdb \"disassemble\" command is prohibited because the kernel text\n"
"%swas relocated%s; use the crash \"dis\" command instead.\n",
space(strlen(pc->curcmd)+2), kt->flags2 & KASLR ? " by KASLR" : "");
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;
ulong readflags;
if (write)
return FALSE;
if (pc->cur_req->flags & GNU_NO_READMEM)
return TRUE;
readflags = pc->curcmd_flags & PARTIAL_READ_OK ?
RETURN_ON_ERROR|RETURN_PARTIAL : RETURN_ON_ERROR;
if (STREQ(pc->curcmd, "bpf") && pc->curcmd_private &&
(addr > (ulong)pc->curcmd_private))
readflags |= QUIET;
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", readflags));
switch (len)
{
case SIZEOF_8BIT:
if (STREQ(pc->curcmd, "bt")) {
if (readmem(addr, memtype, buf, SIZEOF_8BIT,
"gdb_readmem_callback", readflags))
return TRUE;
}
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", readflags))
return FALSE;
*p1 = locbuf[0];
if (memtype == KVADDR) {
p2 = (uint32_t *)locbuf;
text_value_cache(addr, *p2, 0);
}
return TRUE;
case SIZEOF_32BIT:
if (STREQ(pc->curcmd, "bt")) {
if (readmem(addr, memtype, buf, SIZEOF_32BIT,
"gdb_readmem_callback", readflags))
return TRUE;
}
if ((memtype == KVADDR) && text_value_cache(addr, 0, buf))
return TRUE;
if (!readmem(addr, memtype, buf, SIZEOF_32BIT,
"gdb_readmem callback", readflags))
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", readflags));
}
/*
* 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;
}
/*