1006 lines
24 KiB
C
1006 lines
24 KiB
C
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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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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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* 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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* 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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/* 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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char remcom_in_buffer[BUFMAX];
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char remcom_out_buffer[BUFMAX];
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static const char hexchars[] = "0123456789abcdef";
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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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gdb_mem_fault_handler = &&err;
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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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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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* 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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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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* 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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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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err = probe_kernel_write(mem, &c, 1);
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if (err)
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break;
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mem++;
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}
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return err;
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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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tmp_raw = buf + count * 2;
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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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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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gdb_mem_fault_handler = &&err;
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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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count--;
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}
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*buf = 0;
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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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* 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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*long_val = 0;
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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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*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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if (negate)
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*long_val = -*long_val;
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return num;
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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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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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return -1;
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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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* $<packet info>#<checksum>.
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*/
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while (1) {
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gdb_io_ops.write_char('$');
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checksum = 0;
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count = 0;
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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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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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/* Now see what we get in reply. */
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ch = gdb_io_ops.read_char();
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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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* 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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/* scan for the sequence $<data>#<checksum> */
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static void get_packet(char *buffer)
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{
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unsigned char checksum;
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unsigned char xmitcsum;
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int count;
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char ch;
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do {
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/*
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* Spin and wait around for the start character, ignore all
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* other characters:
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*/
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while ((ch = (gdb_io_ops.read_char())) != '$')
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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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count = 0;
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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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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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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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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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#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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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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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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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
|
||
|
|
* are deep trouble not being able to put things back the way we
|
||
|
|
* found them.
|
||
|
|
*/
|
||
|
|
err = gdb_arch_set_breakpoint(addr, tmp_variable);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
err = gdb_arch_remove_breakpoint(addr, tmp_variable);
|
||
|
|
if (err)
|
||
|
|
rt_kprintf("GDB: Critical breakpoint error,memory destroyed at: %08x \n", addr);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Some architectures need cache flushes when we set/clear a
|
||
|
|
* breakpoint:
|
||
|
|
*/
|
||
|
|
static void gdb_flush_swbreak_addr(unsigned long addr)
|
||
|
|
{
|
||
|
|
if (!CACHE_FLUSH_IS_SAFE)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* Force flush instruction cache if it was outside the mm */
|
||
|
|
gdb_flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* SW breakpoint management:
|
||
|
|
*/
|
||
|
|
static int gdb_activate_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_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);
|
||
|
|
}
|
||
|
|
|