libs/rt-thread
libs
/
rt-thread
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
rt-thread/components/gdb/gdb_stub.c

1006 lines
24 KiB
C
Raw Blame History

/*
* GDB stub.
*
* Migarte form linux to rt-thread by Wzyy2
* Original edition : KGDB stub
*
* File : gdb_stub.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Develop Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2014-07-04 Wzyy2 first version
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* KGDB stub.
*
* Maintainer: Jason Wessel <jason.wessel@windriver.com>
*
* Copyright (C) 2000-2001 VERITAS Software Corporation.
* Copyright (C) 2002-2004 Timesys Corporation
* Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
* Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
* Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
* Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
* Copyright (C) 2005-2008 Wind River Systems, Inc.
* Copyright (C) 2007 MontaVista Software, Inc.
* Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
*
* Contributors at various stages not listed above:
* Jason Wessel ( jason.wessel@windriver.com )
* George Anzinger <george@mvista.com>
* Anurekh Saxena (anurekh.saxena@timesys.com)
* Lake Stevens Instrument Division (Glenn Engel)
* Jim Kingdon, Cygnus Support.
*
* Original KGDB stub: David Grothe <dave@gcom.com>,
* Tigran Aivazian <tigran@sco.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <rtthread.h>
#include <rthw.h>
#include <string.h>
#include "gdb_stub.h"
struct gdb_state {
int signo;
int pass_exception;
}gs;
/**
* gdb_connected - Is a host GDB connected to us?
*/
int gdb_connected;
/*
* Holds information about breakpoints in a kernel. These breakpoints are
* added and removed by gdb.
*/
#if RT_GDB_HAVE_SWBP
static struct gdb_bkpt gdb_break[GDB_MAX_BREAKPOINTS] = {
[0 ... GDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
};
#endif
/* Storage for the registers, in GDB format. */
static unsigned long gdb_regs[(NUMREGBYTES +
sizeof(unsigned long) - 1) /
sizeof(unsigned long)];
char remcom_in_buffer[BUFMAX];
char remcom_out_buffer[BUFMAX];
static const char hexchars[] = "0123456789abcdef";
//to call that there has been an error
void* volatile gdb_mem_fault_handler = (void *)0;
static long probe_kernel_write(void *dst, void *src, size_t size)
{
int i = 0;
char *dst_ptr = (char *)dst;
char *src_ptr = (char *)src;
gdb_mem_fault_handler = &&err;
for (i = 0; i<size; i++) {
*(dst_ptr++) = *(src_ptr++);
}
gdb_mem_fault_handler = (void *)0;
return 0;
err:
gdb_mem_fault_handler = (void *)0;
return -1;
}
/*
* GDB remote protocol parser:
*/
static int hex(char ch)
{
if ((ch >= 'a') && (ch <= 'f'))
return ch - 'a' + 10;
if ((ch >= '0') && (ch <= '9'))
return ch - '0';
if ((ch >= 'A') && (ch <= 'F'))
return ch - 'A' + 10;
return -1;
}
static char tohex(char c)
{
return hexchars[c & 15];
}
/*
* Copy the binary array pointed to by buf into mem. Fix $, #, and
* 0x7d escaped with 0x7d. Return a pointer to the character after
* the last byte written.
*/
int gdb_ebin2mem(char *buf, char *mem, int count)
{
int err = 0;
char c;
while (count-- > 0) {
c = *buf++;
if (c == 0x7d)
c = *buf++ ^ 0x20;
err = probe_kernel_write(mem, &c, 1);
if (err)
break;
mem++;
}
return err;
}
/*
* Convert the hex array pointed to by buf into binary to be placed in mem.
* Return a pointer to the character AFTER the last byte written.
* May return an error.
*/
int gdb_hex2mem(char *buf, char *mem, int count)
{
char *tmp_raw;
char *tmp_hex;
tmp_raw = buf + count * 2;
tmp_hex = tmp_raw - 1;
while (tmp_hex >= buf) {
tmp_raw--;
*tmp_raw = hex(*tmp_hex--);
*tmp_raw |= hex(*tmp_hex--) << 4;
}
return probe_kernel_write(mem, tmp_raw, count);
}
/*
* Convert the memory pointed to by mem into hex, placing result in buf.
* Return a pointer to the last char put in buf (null). May return an error.
*/
int gdb_mem2hex(char *mem, char *buf, int count)
{
char *tmp = mem;
char ch;
gdb_mem_fault_handler = &&err;
while (count > 0) {
ch = *(tmp++);
*(buf++) = tohex((ch >> 4) & 0xf);
*(buf++) = tohex(ch & 0xf);
count--;
}
*buf = 0;
gdb_mem_fault_handler = (void *)0;
return 0;
err:
gdb_mem_fault_handler = (void *)0;
return -1;
}
/*
* While we find nice hex chars, build a long_val.
* Return number of chars processed.
*/
int gdb_hex2long(char **ptr, unsigned long *long_val)
{
int hex_val;
int num = 0;
int negate = 0;
*long_val = 0;
if (**ptr == '-') {
negate = 1;
(*ptr)++;
}
while (**ptr) {
hex_val = hex(**ptr);
if (hex_val < 0)
break;
*long_val = (*long_val << 4) | hex_val;
num++;
(*ptr)++;
}
if (negate)
*long_val = -*long_val;
return num;
}
/* Write memory due to an 'M' or 'X' packet. */
static int write_mem_msg(int binary)
{
char *ptr = &remcom_in_buffer[1];
unsigned long addr;
unsigned long length;
int err;
if (gdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
gdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
#ifdef GDB_DATA_ACCESS
//accesses to areas not backed can cause error
if (gdb_permit_data_access(addr, length))
return -1;
#endif
if (binary)
err = gdb_ebin2mem(ptr, (char *)addr, length);
else
err = gdb_hex2mem(ptr, (char *)addr, length);
if (err)
return err;
#ifdef RT_GDB_ICACHE
if (CACHE_FLUSH_IS_SAFE)
gdb_flush_icache_range(addr, addr + length);
#endif
return 0;
}
return -1;
}
/*
* Send the packet in buffer.
* Check for gdb connection if asked for.
*/
static void put_packet(char *buffer)
{
unsigned char checksum;
int count;
char ch;
/*
* $<packet info>#<checksum>.
*/
while (1) {
gdb_io_ops.write_char('$');
checksum = 0;
count = 0;
while ((ch = buffer[count])) {
gdb_io_ops.write_char(ch);
checksum += ch;
count++;
}
gdb_io_ops.write_char('#');
gdb_io_ops.write_char(tohex((checksum >> 4) & 0xf));
gdb_io_ops.write_char(tohex(checksum & 0xf));
/* Now see what we get in reply. */
ch = gdb_io_ops.read_char();
/* If we get an ACK, we are done. */
if (ch == '+')
return;
/*
* If we get the start of another packet, this means
* that GDB is attempting to reconnect. We will NAK
* the packet being sent, and stop trying to send this
* packet.
*/
if (ch == '$') {
gdb_io_ops.write_char('-');
if (gdb_io_ops.flush)
gdb_io_ops.flush();
return;
}
}
}
/* scan for the sequence $<data>#<checksum> */
static void get_packet(char *buffer)
{
unsigned char checksum;
unsigned char xmitcsum;
int count;
char ch;
do {
/*
* Spin and wait around for the start character, ignore all
* other characters:
*/
while ((ch = (gdb_io_ops.read_char())) != '$')
/* nothing */;
gdb_connected = 1;
checksum = 0;
xmitcsum = -1;
count = 0;
/*
* now, read until a # or end of buffer is found:
*/
while (count < (BUFMAX - 1)) {
ch = gdb_io_ops.read_char();
if (ch == '#')
break;
checksum = checksum + ch;
buffer[count] = ch;
count = count + 1;
}
buffer[count] = 0;
if (ch == '#') {
xmitcsum = hex(gdb_io_ops.read_char()) << 4;
xmitcsum += hex(gdb_io_ops.read_char());
if (checksum != xmitcsum)
/* failed checksum */
gdb_io_ops.write_char('-');
else
/* successful transfer */
gdb_io_ops.write_char('+');
if (gdb_io_ops.flush)
gdb_io_ops.flush();
}
} while (checksum != xmitcsum);
}
static void error_packet(char *pkt, int error)
{
error = -error;
pkt[0] = 'E';
pkt[1] = tohex((error / 10));
pkt[2] = tohex((error % 10));
pkt[3] = '\0';
}
#if RT_GDB_HAVE_SWBP
static int gdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
{
int err;
err = probe_kernel_write((void *)saved_instr, (void *)addr, BREAK_INSTR_SIZE);
if (err)
return err;
return probe_kernel_write((void *)addr, (void *)arch_gdb_ops.gdb_bpt_instr,
BREAK_INSTR_SIZE);
}
static int gdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
{
return probe_kernel_write((void *)addr,
(void *)bundle, BREAK_INSTR_SIZE);
}
static int gdb_validate_break_address(unsigned long addr)
{
char tmp_variable[BREAK_INSTR_SIZE];
int err;
/* Validate setting the breakpoint and then removing it. In the
* 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, &regno)){
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, &regno) && *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);
}
View Git Blame Copy Permalink