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@@ -1,1005 +0,0 @@
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-/*
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- * GDB stub.
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- *
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- * Migarte form linux to rt-thread by Wzyy2
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- * Original edition : KGDB stub
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- *
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- * File : gdb_stub.c
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- * This file is part of RT-Thread RTOS
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- * COPYRIGHT (C) 2006, RT-Thread Develop Team
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- *
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- * The license and distribution terms for this file may be
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- * found in the file LICENSE in this distribution or at
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- * http://www.rt-thread.org/license/LICENSE
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- *
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- * Change Logs:
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- * Date Author Notes
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- * 2014-07-04 Wzyy2 first version
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- *
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- * This file incorporates work covered by the following copyright and
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- * permission notice:
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- *
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- * KGDB stub.
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- *
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- * Maintainer: Jason Wessel <jason.wessel@windriver.com>
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- *
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- * Copyright (C) 2000-2001 VERITAS Software Corporation.
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- * Copyright (C) 2002-2004 Timesys Corporation
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- * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
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- * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
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- * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
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- * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
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- * Copyright (C) 2005-2008 Wind River Systems, Inc.
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- * Copyright (C) 2007 MontaVista Software, Inc.
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- * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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- *
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- * Contributors at various stages not listed above:
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- * Jason Wessel ( jason.wessel@windriver.com )
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- * George Anzinger <george@mvista.com>
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- * Anurekh Saxena (anurekh.saxena@timesys.com)
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- * Lake Stevens Instrument Division (Glenn Engel)
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- * Jim Kingdon, Cygnus Support.
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- *
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- * Original KGDB stub: David Grothe <dave@gcom.com>,
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- * Tigran Aivazian <tigran@sco.com>
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- *
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- * This file is licensed under the terms of the GNU General Public License
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- * version 2. This program is licensed "as is" without any warranty of any
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- * kind, whether express or implied.
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- */
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-#include <rtthread.h>
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-#include <rthw.h>
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-#include <string.h>
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-#include "gdb_stub.h"
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-
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-
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-struct gdb_state {
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- int signo;
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- int pass_exception;
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-}gs;
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-
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-/**
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- * gdb_connected - Is a host GDB connected to us?
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- */
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-int gdb_connected;
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-
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-
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-
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-/*
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- * Holds information about breakpoints in a kernel. These breakpoints are
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- * added and removed by gdb.
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- */
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-#if RT_GDB_HAVE_SWBP
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-static struct gdb_bkpt gdb_break[GDB_MAX_BREAKPOINTS] = {
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- [0 ... GDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
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-};
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-#endif
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-
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-
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-/* Storage for the registers, in GDB format. */
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-static unsigned long gdb_regs[(NUMREGBYTES +
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- sizeof(unsigned long) - 1) /
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-sizeof(unsigned long)];
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-
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-char remcom_in_buffer[BUFMAX];
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-char remcom_out_buffer[BUFMAX];
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-
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-
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-static const char hexchars[] = "0123456789abcdef";
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-
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-
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-//to call that there has been an error
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-void* volatile gdb_mem_fault_handler = (void *)0;
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-static long probe_kernel_write(void *dst, void *src, size_t size)
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-{
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- int i = 0;
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- char *dst_ptr = (char *)dst;
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- char *src_ptr = (char *)src;
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-
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- gdb_mem_fault_handler = &&err;
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-
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- for (i = 0; i<size; i++) {
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- *(dst_ptr++) = *(src_ptr++);
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- }
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-
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- gdb_mem_fault_handler = (void *)0;
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- return 0;
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-err:
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- gdb_mem_fault_handler = (void *)0;
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- return -1;
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-}
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-
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-/*
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- * GDB remote protocol parser:
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- */
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-static int hex(char ch)
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-{
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- if ((ch >= 'a') && (ch <= 'f'))
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- return ch - 'a' + 10;
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- if ((ch >= '0') && (ch <= '9'))
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- return ch - '0';
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- if ((ch >= 'A') && (ch <= 'F'))
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- return ch - 'A' + 10;
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- return -1;
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-}
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-
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-static char tohex(char c)
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-{
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- return hexchars[c & 15];
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-}
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-
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-/*
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- * Copy the binary array pointed to by buf into mem. Fix $, #, and
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- * 0x7d escaped with 0x7d. Return a pointer to the character after
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- * the last byte written.
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- */
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-int gdb_ebin2mem(char *buf, char *mem, int count)
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-{
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- int err = 0;
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- char c;
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-
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- while (count-- > 0) {
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- c = *buf++;
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- if (c == 0x7d)
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- c = *buf++ ^ 0x20;
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-
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- err = probe_kernel_write(mem, &c, 1);
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- if (err)
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- break;
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-
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- mem++;
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- }
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-
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- return err;
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-}
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-
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-/*
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- * Convert the hex array pointed to by buf into binary to be placed in mem.
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- * Return a pointer to the character AFTER the last byte written.
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- * May return an error.
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- */
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-int gdb_hex2mem(char *buf, char *mem, int count)
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-{
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- char *tmp_raw;
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- char *tmp_hex;
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-
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- tmp_raw = buf + count * 2;
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-
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- tmp_hex = tmp_raw - 1;
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- while (tmp_hex >= buf) {
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- tmp_raw--;
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- *tmp_raw = hex(*tmp_hex--);
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- *tmp_raw |= hex(*tmp_hex--) << 4;
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- }
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-
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- return probe_kernel_write(mem, tmp_raw, count);
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-}
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-/*
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- * Convert the memory pointed to by mem into hex, placing result in buf.
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- * Return a pointer to the last char put in buf (null). May return an error.
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- */
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-int gdb_mem2hex(char *mem, char *buf, int count)
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-{
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- char *tmp = mem;
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- char ch;
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-
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- gdb_mem_fault_handler = &&err;
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-
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- while (count > 0) {
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- ch = *(tmp++);
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- *(buf++) = tohex((ch >> 4) & 0xf);
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- *(buf++) = tohex(ch & 0xf);
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-
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- count--;
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- }
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- *buf = 0;
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-
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- gdb_mem_fault_handler = (void *)0;
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- return 0;
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-err:
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- gdb_mem_fault_handler = (void *)0;
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- return -1;
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-}
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-
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-/*
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- * While we find nice hex chars, build a long_val.
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- * Return number of chars processed.
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- */
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-int gdb_hex2long(char **ptr, unsigned long *long_val)
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-{
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- int hex_val;
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- int num = 0;
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- int negate = 0;
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-
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- *long_val = 0;
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-
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- if (**ptr == '-') {
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- negate = 1;
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- (*ptr)++;
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- }
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- while (**ptr) {
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- hex_val = hex(**ptr);
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- if (hex_val < 0)
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- break;
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-
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- *long_val = (*long_val << 4) | hex_val;
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- num++;
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- (*ptr)++;
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- }
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-
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- if (negate)
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- *long_val = -*long_val;
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-
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- return num;
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-}
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-
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-/* Write memory due to an 'M' or 'X' packet. */
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-static int write_mem_msg(int binary)
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-{
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- char *ptr = &remcom_in_buffer[1];
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- unsigned long addr;
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- unsigned long length;
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- int err;
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-
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- if (gdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
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- gdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
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-#ifdef GDB_DATA_ACCESS
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- //accesses to areas not backed can cause error
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- if (gdb_permit_data_access(addr, length))
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- return -1;
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-#endif
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- if (binary)
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- err = gdb_ebin2mem(ptr, (char *)addr, length);
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- else
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- err = gdb_hex2mem(ptr, (char *)addr, length);
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- if (err)
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- return err;
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-#ifdef RT_GDB_ICACHE
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- if (CACHE_FLUSH_IS_SAFE)
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- gdb_flush_icache_range(addr, addr + length);
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-#endif
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- return 0;
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- }
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-
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- return -1;
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-}
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-
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-/*
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- * Send the packet in buffer.
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- * Check for gdb connection if asked for.
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- */
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-static void put_packet(char *buffer)
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-{
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- unsigned char checksum;
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- int count;
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- char ch;
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-
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- /*
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- * $<packet info>#<checksum>.
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- */
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- while (1) {
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- gdb_io_ops.write_char('$');
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- checksum = 0;
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- count = 0;
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-
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- while ((ch = buffer[count])) {
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- gdb_io_ops.write_char(ch);
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- checksum += ch;
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- count++;
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- }
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-
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- gdb_io_ops.write_char('#');
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- gdb_io_ops.write_char(tohex((checksum >> 4) & 0xf));
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- gdb_io_ops.write_char(tohex(checksum & 0xf));
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-
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-
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- /* Now see what we get in reply. */
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- ch = gdb_io_ops.read_char();
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-
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- /* If we get an ACK, we are done. */
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- if (ch == '+')
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- return;
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-
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- /*
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- * If we get the start of another packet, this means
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- * that GDB is attempting to reconnect. We will NAK
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- * the packet being sent, and stop trying to send this
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- * packet.
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- */
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- if (ch == '$') {
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- gdb_io_ops.write_char('-');
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- if (gdb_io_ops.flush)
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- gdb_io_ops.flush();
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- return;
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- }
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- }
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-}
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-
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-/* scan for the sequence $<data>#<checksum> */
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-static void get_packet(char *buffer)
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-{
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- unsigned char checksum;
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- unsigned char xmitcsum;
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- int count;
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- char ch;
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-
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- do {
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- /*
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- * Spin and wait around for the start character, ignore all
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- * other characters:
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- */
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- while ((ch = (gdb_io_ops.read_char())) != '$')
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- /* nothing */;
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- gdb_connected = 1;
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- checksum = 0;
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- xmitcsum = -1;
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-
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- count = 0;
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-
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- /*
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- * now, read until a # or end of buffer is found:
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- */
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- while (count < (BUFMAX - 1)) {
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- ch = gdb_io_ops.read_char();
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- if (ch == '#')
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- break;
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- checksum = checksum + ch;
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- buffer[count] = ch;
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- count = count + 1;
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- }
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- buffer[count] = 0;
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-
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- if (ch == '#') {
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- xmitcsum = hex(gdb_io_ops.read_char()) << 4;
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- xmitcsum += hex(gdb_io_ops.read_char());
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-
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- if (checksum != xmitcsum)
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- /* failed checksum */
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- gdb_io_ops.write_char('-');
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- else
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- /* successful transfer */
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- gdb_io_ops.write_char('+');
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- if (gdb_io_ops.flush)
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- gdb_io_ops.flush();
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- }
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- } while (checksum != xmitcsum);
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-}
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-
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-static void error_packet(char *pkt, int error)
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-{
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- error = -error;
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- pkt[0] = 'E';
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- pkt[1] = tohex((error / 10));
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- pkt[2] = tohex((error % 10));
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- pkt[3] = '\0';
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-}
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-
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-#if RT_GDB_HAVE_SWBP
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-static int gdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
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-{
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- int err;
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-
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- err = probe_kernel_write((void *)saved_instr, (void *)addr, BREAK_INSTR_SIZE);
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- if (err)
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- return err;
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-
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- return probe_kernel_write((void *)addr, (void *)arch_gdb_ops.gdb_bpt_instr,
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- BREAK_INSTR_SIZE);
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-}
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-
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-static int gdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
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-{
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- return probe_kernel_write((void *)addr,
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- (void *)bundle, BREAK_INSTR_SIZE);
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-}
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-static int gdb_validate_break_address(unsigned long addr)
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-{
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- char tmp_variable[BREAK_INSTR_SIZE];
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- int err;
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- /* Validate setting the breakpoint and then removing it. In the
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- * remove fails, the kernel needs to emit a bad message because we
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- * are deep trouble not being able to put things back the way we
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- * found them.
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- */
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- err = gdb_arch_set_breakpoint(addr, tmp_variable);
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- if (err)
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- return err;
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- err = gdb_arch_remove_breakpoint(addr, tmp_variable);
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- if (err)
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- rt_kprintf("GDB: Critical breakpoint error,memory destroyed at: %08x \n", addr);
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- return err;
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-}
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-
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-/*
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- * Some architectures need cache flushes when we set/clear a
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- * breakpoint:
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- */
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-static void gdb_flush_swbreak_addr(unsigned long addr)
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-{
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- if (!CACHE_FLUSH_IS_SAFE)
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- return;
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-
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- /* Force flush instruction cache if it was outside the mm */
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- gdb_flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
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-}
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-
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-/*
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- * SW breakpoint management:
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- */
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-static int gdb_activate_sw_breakpoints(void)
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-{
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- unsigned long addr;
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- int error = 0;
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- int i;
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-
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- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
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|
|
- if (gdb_break[i].state != BP_SET)
|
|
|
- continue;
|
|
|
-
|
|
|
- addr = gdb_break[i].bpt_addr;
|
|
|
- error = gdb_arch_set_breakpoint(addr,
|
|
|
- (char *)(gdb_break[i].saved_instr));
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
-
|
|
|
- gdb_flush_swbreak_addr(addr);
|
|
|
- gdb_break[i].state = BP_ACTIVE;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int gdb_set_sw_break(unsigned long addr)
|
|
|
-{
|
|
|
- int err = gdb_validate_break_address(addr);
|
|
|
- int breakno = -1;
|
|
|
- int i;
|
|
|
-
|
|
|
- if (err)
|
|
|
- return err;
|
|
|
-
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if ((gdb_break[i].state == BP_SET) &&
|
|
|
- (gdb_break[i].bpt_addr == addr))
|
|
|
- return -1;
|
|
|
- }
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if (gdb_break[i].state == BP_REMOVED) {
|
|
|
- breakno = i;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (breakno == -1) {
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if (gdb_break[i].state == BP_UNDEFINED) {
|
|
|
- breakno = i;
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (breakno == -1)
|
|
|
- return -1;
|
|
|
-
|
|
|
- gdb_break[breakno].state = BP_SET;
|
|
|
- gdb_break[breakno].type = BP_BREAKPOINT;
|
|
|
- gdb_break[breakno].bpt_addr = addr;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int gdb_deactivate_sw_breakpoints(void)
|
|
|
-{
|
|
|
- unsigned long addr;
|
|
|
- int error = 0;
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if (gdb_break[i].state != BP_ACTIVE)
|
|
|
- continue;
|
|
|
- addr = gdb_break[i].bpt_addr;
|
|
|
- error = gdb_arch_remove_breakpoint(addr,
|
|
|
- (char *)(gdb_break[i].saved_instr));
|
|
|
- if (error)
|
|
|
- return error;
|
|
|
-
|
|
|
- gdb_flush_swbreak_addr(addr);
|
|
|
- gdb_break[i].state = BP_SET;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int gdb_remove_sw_break(unsigned long addr)
|
|
|
-{
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if ((gdb_break[i].state == BP_SET) &&
|
|
|
- (gdb_break[i].bpt_addr == addr)) {
|
|
|
- gdb_break[i].state = BP_REMOVED;
|
|
|
- return 0;
|
|
|
- }
|
|
|
- }
|
|
|
- return -1;
|
|
|
-}
|
|
|
-
|
|
|
-int gdb_isremovedbreak(unsigned long addr)
|
|
|
-{
|
|
|
- int i;
|
|
|
-
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if ((gdb_break[i].state == BP_REMOVED) &&
|
|
|
- (gdb_break[i].bpt_addr == addr))
|
|
|
- return 1;
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-static int remove_all_break()
|
|
|
-{
|
|
|
-#if RT_GDB_HAVE_SWBP
|
|
|
- unsigned long addr;
|
|
|
- int error=0;
|
|
|
- int i;
|
|
|
-
|
|
|
- /* Clear memory breakpoints. */
|
|
|
- for (i = 0; i < GDB_MAX_BREAKPOINTS; i++) {
|
|
|
- if (gdb_break[i].state != BP_ACTIVE)
|
|
|
- goto setundefined;
|
|
|
- addr = gdb_break[i].bpt_addr;
|
|
|
- error = gdb_arch_remove_breakpoint(addr,
|
|
|
- (char *)gdb_break[i].saved_instr);
|
|
|
- if (error)
|
|
|
- rt_kprintf("GDB: breakpoint remove failed: %lx\n",
|
|
|
- addr);
|
|
|
-setundefined:
|
|
|
- gdb_break[i].state = BP_UNDEFINED;
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
-#if RT_GDB_HAVE_HWBP
|
|
|
- /* Clear hardware breakpoints. */
|
|
|
- arch_gdb_ops.remove_all_hw_break();
|
|
|
-#endif
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static char gdbmsgbuf[BUFMAX + 1];
|
|
|
-static void gdb_msg_write(const char *s, int len)
|
|
|
-{
|
|
|
- char *bufptr;
|
|
|
- int wcount;
|
|
|
- int i;
|
|
|
-
|
|
|
- /* 'O'utput */
|
|
|
- gdbmsgbuf[0] = 'O';
|
|
|
-
|
|
|
- /* Fill and send buffers... */
|
|
|
- while (len > 0) {
|
|
|
- bufptr = gdbmsgbuf + 1;
|
|
|
-
|
|
|
- /* Calculate how many this time */
|
|
|
- if ((len << 1) > (BUFMAX - 2))
|
|
|
- wcount = (BUFMAX - 2) >> 1;
|
|
|
- else
|
|
|
- wcount = len;
|
|
|
-
|
|
|
- /* Pack in hex chars */
|
|
|
- for (i = 0; i < wcount; i++) {
|
|
|
- *(bufptr++) = tohex((s[i] >> 4) & 0xf);
|
|
|
- *(bufptr++) = tohex(s[i] & 0xf);
|
|
|
- }
|
|
|
- *bufptr = '\0';
|
|
|
-
|
|
|
- /* Move up */
|
|
|
- s += wcount;
|
|
|
- len -= wcount;
|
|
|
-
|
|
|
- /* Write packet */
|
|
|
- put_packet(gdbmsgbuf);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Return true if there is a valid gdb I/O module. Also if no
|
|
|
- * debugger is attached a message can be printed to the console about
|
|
|
- * waiting for the debugger to attach.
|
|
|
- *
|
|
|
- * The print_wait argument is only to be true when called from inside
|
|
|
- * the core gdb_handle_exception, because it will wait for the
|
|
|
- * debugger to attach.
|
|
|
- */
|
|
|
-static int gdb_io_ready(int print_wait)
|
|
|
-{
|
|
|
- if (!gdb_dev)
|
|
|
- return 0;
|
|
|
- if (gdb_connected)
|
|
|
- return 1;
|
|
|
- if (print_wait)
|
|
|
- rt_kprintf("GDB: Waiting for remote debugger\n");
|
|
|
- return 1;
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the '?' status packets */
|
|
|
-static void gdb_cmd_status(struct gdb_state *gs)
|
|
|
-{
|
|
|
- /*
|
|
|
- * We know that this packet is only sent
|
|
|
- * during initial connect. So to be safe,
|
|
|
- * we clear out our breakpoints now in case
|
|
|
- * GDB is reconnecting.
|
|
|
- */
|
|
|
- remove_all_break();
|
|
|
-
|
|
|
- remcom_out_buffer[0] = 'S';
|
|
|
- remcom_out_buffer[1] = tohex((gs->signo >> 4) &0xf);
|
|
|
- remcom_out_buffer[2] = tohex(gs->signo & 0xf);
|
|
|
- remcom_out_buffer[3] = 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'm' memory read bytes */
|
|
|
-static void gdb_cmd_memread(struct gdb_state *gs)
|
|
|
-{
|
|
|
- char *ptr = &remcom_in_buffer[1];
|
|
|
- unsigned long length;
|
|
|
- unsigned long addr;
|
|
|
- int err;
|
|
|
-
|
|
|
- if (gdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
|
|
|
- gdb_hex2long(&ptr, &length) > 0) {
|
|
|
-#ifdef GDB_DATA_ACCESS
|
|
|
- //accesses to areas not backed can cause error
|
|
|
- if (gdb_permit_data_access(addr, length))
|
|
|
- return ;
|
|
|
-#endif
|
|
|
- err = gdb_mem2hex((char *)addr, remcom_out_buffer, length);
|
|
|
- if (err)
|
|
|
- error_packet(remcom_out_buffer, err);
|
|
|
- } else {
|
|
|
- error_packet(remcom_out_buffer, -1);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'M' memory write bytes */
|
|
|
-static void gdb_cmd_memwrite(struct gdb_state *gs)
|
|
|
-{
|
|
|
- int err = write_mem_msg(0);
|
|
|
-
|
|
|
- if (err)
|
|
|
- error_packet(remcom_out_buffer, err);
|
|
|
- else
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'X' memory binary write bytes */
|
|
|
-static void gdb_cmd_binwrite(struct gdb_state *gs)
|
|
|
-{
|
|
|
- int err = write_mem_msg(1);
|
|
|
-
|
|
|
- if (err)
|
|
|
- error_packet(remcom_out_buffer, err);
|
|
|
- else
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'q' query packets */
|
|
|
-static void gdb_cmd_query(struct gdb_state *gs)
|
|
|
-{
|
|
|
- /* nothing,because we have no thread support */
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/* Handle the 'g' or 'p' get registers request */
|
|
|
-static void gdb_cmd_getregs(struct gdb_state *gs)
|
|
|
-{
|
|
|
- char len = sizeof(long);
|
|
|
-
|
|
|
- gdb_get_register((unsigned long *)gdb_regs);
|
|
|
-
|
|
|
- /*get one registers*/
|
|
|
- if (remcom_in_buffer[0] == 'p'){
|
|
|
- char *p = &remcom_in_buffer[1];
|
|
|
- unsigned long regno = 0;
|
|
|
-
|
|
|
- if (gdb_hex2long(&p, ®no)){
|
|
|
- gdb_mem2hex(((char *)gdb_regs) + regno * len, remcom_out_buffer, len);
|
|
|
- return;
|
|
|
- } else {
|
|
|
- strcpy(remcom_out_buffer, "INVALID");
|
|
|
- return;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- gdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'G' or 'P' set registers request */
|
|
|
-static void gdb_cmd_setregs(struct gdb_state *gs)
|
|
|
-{
|
|
|
- char len = sizeof(long);
|
|
|
-
|
|
|
- /*set one registers*/
|
|
|
- if (remcom_in_buffer[0] == 'P'){
|
|
|
- char *p = &remcom_in_buffer[1];
|
|
|
- unsigned long regno = 0;
|
|
|
-
|
|
|
- if (gdb_hex2long(&p, ®no) && *p++ == '='){
|
|
|
- gdb_get_register((unsigned long *)gdb_regs);
|
|
|
- gdb_hex2mem(p, ((char *)gdb_regs) + regno * len, len);
|
|
|
- gdb_put_register(gdb_regs);
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
- }
|
|
|
-
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- gdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
|
|
|
-
|
|
|
- gdb_put_register(gdb_regs);
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'D' or 'k', detach or kill packets */
|
|
|
-static void gdb_cmd_detachkill(struct gdb_state *gs)
|
|
|
-{
|
|
|
- int error;
|
|
|
-
|
|
|
- /* The detach case */
|
|
|
- if (remcom_in_buffer[0] == 'D') {
|
|
|
- error = remove_all_break();
|
|
|
- if (error < 0) {
|
|
|
- error_packet(remcom_out_buffer, error);
|
|
|
- } else {
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
- gdb_connected = 0;
|
|
|
- }
|
|
|
- put_packet(remcom_out_buffer);
|
|
|
- } else {
|
|
|
- /*
|
|
|
- * Assume the kill case, with no exit code checking,
|
|
|
- * trying to force detach the debugger:
|
|
|
- */
|
|
|
- remove_all_break();
|
|
|
- gdb_connected = 0;
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'z' or 'Z' breakpoint remove or set packets */
|
|
|
-static void gdb_cmd_break(struct gdb_state *gs)
|
|
|
-{
|
|
|
- /*
|
|
|
- * Since GDB-5.3, it's been drafted that '0' is a software
|
|
|
- * breakpoint, '1' is a hardware breakpoint, so let's do that.
|
|
|
- */
|
|
|
- char *bpt_type = &remcom_in_buffer[1];
|
|
|
- char *ptr = &remcom_in_buffer[2];
|
|
|
- unsigned long addr;
|
|
|
- unsigned long length;
|
|
|
- int error = 0;
|
|
|
-
|
|
|
- if (arch_gdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
|
|
|
- /* Unsupported */
|
|
|
- if (*bpt_type > '4')
|
|
|
- return;
|
|
|
- }
|
|
|
- /*
|
|
|
- * Test if this is a hardware breakpoint, and
|
|
|
- * if we support it:
|
|
|
- */
|
|
|
- if (*bpt_type == '1' && !(arch_gdb_ops.flags)) {
|
|
|
- /* Unsupported. */
|
|
|
- return;
|
|
|
- }
|
|
|
- if (*(ptr++) != ',') {
|
|
|
- error_packet(remcom_out_buffer, -1);
|
|
|
- return;
|
|
|
- }
|
|
|
- if (!gdb_hex2long(&ptr, &addr)) {
|
|
|
- error_packet(remcom_out_buffer, -1);
|
|
|
- return;
|
|
|
- }
|
|
|
- if (*(ptr++) != ',' ||
|
|
|
- !gdb_hex2long(&ptr, &length)) {
|
|
|
- error_packet(remcom_out_buffer, -1);
|
|
|
- return;
|
|
|
- }
|
|
|
-#if RT_GDB_HAVE_SWBP
|
|
|
- if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
|
|
|
- error = gdb_set_sw_break(addr);
|
|
|
- else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
|
|
|
- error = gdb_remove_sw_break(addr);
|
|
|
-#else
|
|
|
- if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
|
|
|
- error = arch_gdb_ops.set_hw_breakpoint(addr,
|
|
|
- (int)length, BP_HARDWARE_BREAKPOINT);
|
|
|
- else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
|
|
|
- error = arch_gdb_ops.remove_hw_breakpoint(addr,
|
|
|
- (int) length, BP_HARDWARE_BREAKPOINT);
|
|
|
-#endif
|
|
|
- else if (remcom_in_buffer[0] == 'Z')
|
|
|
- error = arch_gdb_ops.set_hw_breakpoint(addr,
|
|
|
- (int)length, *bpt_type - '0');
|
|
|
- else if (remcom_in_buffer[0] == 'z')
|
|
|
- error = arch_gdb_ops.remove_hw_breakpoint(addr,
|
|
|
- (int) length, *bpt_type - '0');
|
|
|
-
|
|
|
- if (error == 0)
|
|
|
- strcpy(remcom_out_buffer, "OK");
|
|
|
- else
|
|
|
- error_packet(remcom_out_buffer, error);
|
|
|
-}
|
|
|
-
|
|
|
-/* Handle the 'C' signal / exception passing packets */
|
|
|
-static int gdb_cmd_exception_pass(struct gdb_state *gs)
|
|
|
-{
|
|
|
- /* C09 == pass exception
|
|
|
- * C15 == detach gdb, pass exception
|
|
|
- */
|
|
|
- if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
|
|
|
-
|
|
|
- gs->pass_exception = 1;
|
|
|
- remcom_in_buffer[0] = 'c';
|
|
|
-
|
|
|
- } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
|
|
|
-
|
|
|
- gs->pass_exception = 1;
|
|
|
- remcom_in_buffer[0] = 'D';
|
|
|
- remove_all_break();
|
|
|
- gdb_connected = 0;
|
|
|
- return 1;
|
|
|
-
|
|
|
- } else {
|
|
|
- error_packet(remcom_out_buffer, -1);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- /* Indicate fall through */
|
|
|
- return -1;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*more about packet in https://www.sourceware.org/gdb/current/onlinedocs/gdb/Packets.html#Packets*/
|
|
|
-static int process_packet(char *pkt)
|
|
|
-{
|
|
|
- int status = 0;
|
|
|
- int tmp;
|
|
|
-
|
|
|
- status = gdb_arch_handle_exception(remcom_in_buffer,
|
|
|
- remcom_out_buffer);
|
|
|
-
|
|
|
- remcom_out_buffer[0] = 0;
|
|
|
- switch (pkt[0]) {
|
|
|
- case '?':/* gdbserial status */
|
|
|
- gdb_cmd_status(&gs);
|
|
|
- break;
|
|
|
- case 'q':/* query command */
|
|
|
- gdb_cmd_query(&gs);
|
|
|
- break;
|
|
|
- case 'p': /* return the value of a single CPU register */
|
|
|
- case 'g': /* return the value of the CPU registers */
|
|
|
- gdb_cmd_getregs(&gs);
|
|
|
- break;
|
|
|
- case 'P': /* set the value of a single CPU registers - return OK */
|
|
|
- case 'G': /* set the value of the CPU registers - return OK */
|
|
|
- gdb_cmd_setregs(&gs);
|
|
|
- break;
|
|
|
- case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
|
|
|
- gdb_cmd_memread(&gs);
|
|
|
- break;
|
|
|
- case 'X':/* XAA..AA,LLLL: Write LLLL escaped binary bytes at address AA.AA*/
|
|
|
- gdb_cmd_binwrite(&gs);
|
|
|
- break;
|
|
|
- case 'M':/* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
|
|
|
- gdb_cmd_memwrite(&gs);
|
|
|
- break;
|
|
|
- case 'D': /* Debugger detach */
|
|
|
- case 'k': /* Debugger detach via kill */
|
|
|
- gdb_cmd_detachkill(&gs);
|
|
|
- break;
|
|
|
- case 'C':/* Exception passing */
|
|
|
- tmp = gdb_cmd_exception_pass(&gs);
|
|
|
- if (tmp > 0)
|
|
|
- process_packet(remcom_in_buffer);
|
|
|
- if (tmp == 0)
|
|
|
- break;
|
|
|
- case 'z':/* Break point remove */
|
|
|
- case 'Z':/* Break point set */
|
|
|
- gdb_cmd_break(&gs);
|
|
|
- break;
|
|
|
- case 'H':/* task related */
|
|
|
- break;
|
|
|
- case 'T':/* Query thread status */
|
|
|
- break;
|
|
|
- case 'b': /* bBB... Set baud rate to BB... */
|
|
|
- break;
|
|
|
- case 's': /* sAA..AA step form address AA..AA (optional) */
|
|
|
- case 'c': /* cAA..AA Continue at address AA..AA (optional) */
|
|
|
-#if RT_GDB_HAVE_SWBP
|
|
|
- gdb_activate_sw_breakpoints();
|
|
|
-#endif
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- if (!status)
|
|
|
- return -1;
|
|
|
-
|
|
|
-exit:
|
|
|
- put_packet(remcom_out_buffer);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * This function does all command procesing for interfacing to gdb.
|
|
|
- */
|
|
|
-int gdb_process_exception()
|
|
|
-{
|
|
|
- int status;
|
|
|
-
|
|
|
- do {
|
|
|
- get_packet(remcom_in_buffer);
|
|
|
- status = process_packet(remcom_in_buffer);
|
|
|
- } while (status == 0);
|
|
|
-
|
|
|
- if (status < 0)
|
|
|
- return 0;
|
|
|
- else
|
|
|
- return 1;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-int gdb_handle_exception(int signo, void *regs)
|
|
|
-{
|
|
|
- int error;
|
|
|
-
|
|
|
- gs.signo = signo;
|
|
|
-
|
|
|
- if (!gdb_io_ready(1)) {
|
|
|
- error = 1;
|
|
|
- return error; /* No I/O connection, so resume the system */
|
|
|
- }
|
|
|
-
|
|
|
-#if RT_GDB_HAVE_SWBP
|
|
|
- gdb_deactivate_sw_breakpoints();
|
|
|
-#endif
|
|
|
- gdb_set_register(regs);
|
|
|
-
|
|
|
- /* Clear the out buffer. */
|
|
|
- memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
|
|
|
-
|
|
|
- if (gdb_connected) {
|
|
|
- char *ptr;
|
|
|
-
|
|
|
- gdb_io_ops.write_char('\n');
|
|
|
- /* Reply to host that an exception has occurred */
|
|
|
- ptr = remcom_out_buffer;
|
|
|
- *ptr++ = 'T';
|
|
|
- *ptr++ = tohex((gs.signo >> 4) &0xf);
|
|
|
- *ptr++ = tohex(gs.signo & 0xf);
|
|
|
- /*ptr += strlen(strcpy(ptr, "thread:"));*/
|
|
|
- /**ptr++ = ';';*/
|
|
|
- put_packet(remcom_out_buffer);
|
|
|
- }
|
|
|
- gs.pass_exception = 0;
|
|
|
-
|
|
|
-
|
|
|
- while (gdb_process_exception());
|
|
|
-
|
|
|
- error = gs.pass_exception;
|
|
|
-
|
|
|
- return error;
|
|
|
-}
|
|
|
-
|
|
|
-void gdb_console_write(const char *s, unsigned count)
|
|
|
-{
|
|
|
- /* If we're debugging, or GDB has not connected, don't try
|
|
|
- * and print. */
|
|
|
- if (!gdb_connected)
|
|
|
- return;
|
|
|
-
|
|
|
- gdb_msg_write(s, count);
|
|
|
-}
|
|
|
-
|
Bernard Xiong