584 lines
12 KiB
C
584 lines
12 KiB
C
/* MSPDebug - debugging tool for MSP430 MCUs
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* Copyright (C) 2009, 2010 Daniel Beer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include "sockets.h"
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#include "device.h"
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#include "util.h"
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#include "opdb.h"
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#include "gdb.h"
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#include "output.h"
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#include "reader.h"
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#include "expr.h"
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#include "gdb_proto.h"
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#include "ctrlc.h"
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static int register_bytes;
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/************************************************************************
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* GDB server
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*/
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static int read_registers(struct gdb_data *data)
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{
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address_t regs[DEVICE_NUM_REGS];
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int i;
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printc("Reading registers\n");
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if (device_getregs(regs) < 0)
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return gdb_send(data, "E00");
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gdb_packet_start(data);
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for (i = 0; i < DEVICE_NUM_REGS; i++) {
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address_t value = regs[i];
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int j;
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for (j = 0; j < register_bytes; j++) {
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gdb_printf(data, "%02x", value & 0xff);
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value >>= 8;
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}
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}
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gdb_packet_end(data);
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return gdb_flush_ack(data);
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}
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struct monitor_buf {
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char buf[GDB_MAX_XFER];
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int len;
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int trunc;
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};
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static void monitor_capture(void *user_data, const char *text)
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{
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struct monitor_buf *mb = (struct monitor_buf *)user_data;
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int len = strlen(text);
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if (mb->trunc)
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return;
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if (mb->len + len + 64 > sizeof(mb->buf)) {
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text = "...<truncated>";
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len = strlen(text);
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mb->trunc = 1;
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}
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memcpy(mb->buf + mb->len, text, len);
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mb->len += len;
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mb->buf[mb->len++] = '\n';
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}
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static int monitor_command(struct gdb_data *data, char *buf)
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{
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char cmd[128];
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int len = 0;
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int i;
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struct monitor_buf mbuf;
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while (len + 1 < sizeof(cmd) && *buf && buf[1]) {
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if (len + 1 >= sizeof(cmd))
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break;
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cmd[len++] = (hexval(buf[0]) << 4) | hexval(buf[1]);
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buf += 2;
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}
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cmd[len] = 0;
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printc("Monitor command received: %s\n", cmd);
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mbuf.len = 0;
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mbuf.trunc = 0;
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capture_start(monitor_capture, &mbuf);
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process_command(cmd);
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capture_end();
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if (!mbuf.len)
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return gdb_send(data, "OK");
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gdb_packet_start(data);
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for (i = 0; i < mbuf.len; i++)
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gdb_printf(data, "%02x", mbuf.buf[i]);
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gdb_packet_end(data);
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return gdb_flush_ack(data);
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}
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static int write_registers(struct gdb_data *data, char *buf)
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{
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address_t regs[DEVICE_NUM_REGS];
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int nibbles = 4;
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size_t len = strlen(buf);
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if (len >= DEVICE_NUM_REGS * 8)
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nibbles = 8;
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if (len < DEVICE_NUM_REGS * nibbles) {
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printc_err("write_registers: short argument\n");
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return gdb_send(data, "E00");
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}
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printc("Writing registers (%d bits each)\n", nibbles * 4);
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for (int i = 0; i < DEVICE_NUM_REGS; i++) {
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uint32_t r = 0;
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for (int j = 0; j < nibbles; j++)
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r = (r << 4) |
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hexval(buf[i * nibbles +
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nibbles - 1 - (j ^ 1)]);
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regs[i] = r;
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}
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if (device_setregs(regs) < 0)
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return gdb_send(data, "E00");
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return gdb_send(data, "OK");
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}
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static int read_memory(struct gdb_data *data, char *text)
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{
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char *length_text = strchr(text, ',');
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address_t length, addr;
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uint8_t buf[GDB_MAX_XFER];
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int i;
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if (!length_text) {
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printc_err("gdb: malformed memory read request\n");
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return gdb_send(data, "E00");
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}
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*(length_text++) = 0;
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length = strtoul(length_text, NULL, 16);
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addr = strtoul(text, NULL, 16);
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if (length > sizeof(buf))
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length = sizeof(buf);
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printc("Reading %4d bytes from 0x%04x\n", length, addr);
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if (device_readmem(addr, buf, length) < 0)
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return gdb_send(data, "E00");
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gdb_packet_start(data);
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for (i = 0; i < length; i++)
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gdb_printf(data, "%02x", buf[i]);
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gdb_packet_end(data);
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return gdb_flush_ack(data);
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}
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static int write_memory(struct gdb_data *data, char *text)
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{
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char *data_text = strchr(text, ':');
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char *length_text = strchr(text, ',');
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address_t length, addr;
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uint8_t buf[GDB_MAX_XFER];
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int buflen = 0;
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if (!(data_text && length_text)) {
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printc_err("gdb: malformed memory write request\n");
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return gdb_send(data, "E00");
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}
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*(data_text++) = 0;
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*(length_text++) = 0;
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length = strtoul(length_text, NULL, 16);
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addr = strtoul(text, NULL, 16);
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while (buflen < sizeof(buf) && *data_text && data_text[1]) {
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buf[buflen++] = (hexval(data_text[0]) << 4) |
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hexval(data_text[1]);
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data_text += 2;
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}
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if (buflen != length) {
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printc_err("gdb: length mismatch\n");
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return gdb_send(data, "E00");
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}
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printc("Writing %4d bytes to 0x%04x\n", length, addr);
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if (device_writemem(addr, buf, buflen) < 0)
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return gdb_send(data, "E00");
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return gdb_send(data, "OK");
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}
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static int run_set_pc(char *buf)
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{
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address_t regs[DEVICE_NUM_REGS];
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if (!*buf)
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return 0;
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if (device_getregs(regs) < 0)
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return -1;
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regs[0] = strtoul(buf, NULL, 16);
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return device_setregs(regs);
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}
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static int run_final_status(struct gdb_data *data)
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{
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address_t regs[DEVICE_NUM_REGS];
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int i;
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if (device_getregs(regs) < 0)
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return gdb_send(data, "E00");
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gdb_packet_start(data);
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gdb_printf(data, "T05");
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for (i = 0; i < 16; i++) {
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address_t value = regs[i];
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int j;
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/* NOTE: this only gives GDB the lower 16 bits of each
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* register. It complains if we give the full data.
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*/
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gdb_printf(data, "%02x:", i);
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for (j = 0; j < register_bytes; j++) {
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gdb_printf(data, "%02x", value & 0xff);
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value >>= 8;
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}
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gdb_printf(data, ";");
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}
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gdb_packet_end(data);
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return gdb_flush_ack(data);
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}
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static int single_step(struct gdb_data *data, char *buf)
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{
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printc("Single stepping\n");
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if (run_set_pc(buf) < 0 ||
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device_ctl(DEVICE_CTL_STEP) < 0)
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gdb_send(data, "E00");
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return run_final_status(data);
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}
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static int run(struct gdb_data *data, char *buf)
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{
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printc("Running\n");
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if (run_set_pc(buf) < 0 ||
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device_ctl(DEVICE_CTL_RUN) < 0)
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return gdb_send(data, "E00");
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for (;;) {
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device_status_t status = device_poll();
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if (status == DEVICE_STATUS_ERROR)
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return gdb_send(data, "E00");
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if (status == DEVICE_STATUS_HALTED) {
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printc("Target halted\n");
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goto out;
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}
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if (status == DEVICE_STATUS_INTR)
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goto out;
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while (gdb_peek(data, 0)) {
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int c = gdb_getc(data);
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if (c < 0)
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return -1;
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if (c == 3) {
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printc("Interrupted by gdb\n");
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goto out;
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}
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}
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}
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out:
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if (device_ctl(DEVICE_CTL_HALT) < 0)
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return gdb_send(data, "E00");
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return run_final_status(data);
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}
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static int set_breakpoint(struct gdb_data *data, int enable, char *buf)
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{
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char *parts[2];
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address_t addr;
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device_bptype_t type;
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int i;
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/* Break up the arguments */
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for (i = 0; i < 2; i++)
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parts[i] = strsep(&buf, ",");
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/* Make sure there's a type argument */
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if (!parts[0]) {
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printc_err("gdb: breakpoint requested with no type\n");
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return gdb_send(data, "E00");
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}
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switch (atoi(parts[0])) {
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case 0:
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case 1:
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type = DEVICE_BPTYPE_BREAK;
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break;
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case 2:
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type = DEVICE_BPTYPE_WRITE;
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break;
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case 3:
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type = DEVICE_BPTYPE_READ;
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break;
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case 4:
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type = DEVICE_BPTYPE_WATCH;
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break;
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default:
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printc_err("gdb: unsupported breakpoint type: %s\n",
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parts[0]);
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return gdb_send(data, "");
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}
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/* There needs to be an address specified */
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if (!parts[1]) {
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printc_err("gdb: breakpoint address missing\n");
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return gdb_send(data, "E00");
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}
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/* Parse the breakpoint address */
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addr = strtoul(parts[1], NULL, 16);
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if (enable) {
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if (device_setbrk(device_default, -1, 1, addr, type) < 0) {
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printc_err("gdb: can't add breakpoint at "
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"0x%04x\n", addr);
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return gdb_send(data, "E00");
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}
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printc("Breakpoint set at 0x%04x\n", addr);
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} else {
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device_setbrk(device_default, -1, 0, addr, type);
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printc("Breakpoint cleared at 0x%04x\n", addr);
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}
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return gdb_send(data, "OK");
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}
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static int restart_program(struct gdb_data *data)
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{
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if (device_ctl(DEVICE_CTL_RESET) < 0)
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return gdb_send(data, "E00");
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return gdb_send(data, "OK");
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}
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static int gdb_send_empty_threadlist(struct gdb_data *data)
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{
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return gdb_send(data, "<?xml version=\"1.0\"?><threads></threads>");
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}
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static int gdb_send_supported(struct gdb_data *data)
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{
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gdb_packet_start(data);
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gdb_printf(data, "PacketSize=%x", GDB_MAX_XFER * 2);
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gdb_packet_end(data);
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return gdb_flush_ack(data);
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}
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static int process_gdb_command(struct gdb_data *data, char *buf)
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{
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#ifdef DEBUG_GDB
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printc("process_gdb_command: %s\n", buf);
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#endif
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switch (buf[0]) {
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case '?': /* Return target halt reason */
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return run_final_status(data);
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case 'z':
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case 'Z':
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return set_breakpoint(data, buf[0] == 'Z', buf + 1);
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case 'r': /* Restart */
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case 'R':
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return restart_program(data);
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case 'g': /* Read registers */
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return read_registers(data);
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case 'G': /* Write registers */
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return write_registers(data, buf + 1);
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case 'q': /* Query */
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if (!strncmp(buf, "qRcmd,", 6))
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return monitor_command(data, buf + 6);
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if (!strncmp(buf, "qSupported", 10)) {
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/* This is a hack to distinguish msp430-elf-gdb
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* from msp430-gdb. The former expects 32-bit
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* register fields.
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*/
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if (strstr(buf, "multiprocess+"))
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register_bytes = 4;
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return gdb_send_supported(data);
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}
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if (!strncmp(buf, "qfThreadInfo", 12))
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return gdb_send_empty_threadlist(data);
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break;
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case 'm': /* Read memory */
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return read_memory(data, buf + 1);
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case 'M': /* Write memory */
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return write_memory(data, buf + 1);
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case 'c': /* Continue */
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return run(data, buf + 1);
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case 's': /* Single step */
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return single_step(data, buf + 1);
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case 'k': /* kill */
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return -1;
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}
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#ifdef DEBUG_GDB
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printc("process_gdb_command: unknown command %s\n", buf);
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#endif
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/* For unknown/unsupported packets, return an empty reply */
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return gdb_send(data, "");
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}
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static void gdb_reader_loop(struct gdb_data *data)
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{
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while (!ctrlc_check()) {
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char buf[GDB_BUF_SIZE];
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int len = 0;
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len = gdb_read_packet(data, buf);
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if (len < 0)
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return;
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if (len && process_gdb_command(data, buf) < 0)
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return;
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}
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}
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static int gdb_server(int port)
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{
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int sock;
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int client;
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struct sockaddr_in addr;
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socklen_t len;
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int arg;
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struct gdb_data data;
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int i;
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sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (SOCKET_ISERR(sock)) {
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pr_error("gdb: can't create socket");
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return -1;
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}
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arg = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
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(void *)&arg, sizeof(arg)) < 0)
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pr_error("gdb: warning: can't reuse socket address");
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
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printc_err("gdb: can't bind to port %d: %s\n",
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port, last_error());
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closesocket(sock);
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return -1;
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}
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if (listen(sock, 1) < 0) {
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pr_error("gdb: can't listen on socket");
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closesocket(sock);
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return -1;
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}
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printc("Bound to port %d. Now waiting for connection...\n", port);
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len = sizeof(addr);
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client = sockets_accept(sock, (struct sockaddr *)&addr, &len);
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if (SOCKET_ISERR(client)) {
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pr_error("gdb: failed to accept connection");
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closesocket(sock);
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return -1;
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}
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closesocket(sock);
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printc("Client connected from %s:%d\n",
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inet_ntoa(addr.sin_addr), htons(addr.sin_port));
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register_bytes = 2;
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gdb_init(&data, client);
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/* Put the hardware breakpoint setting into a known state. */
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printc("Clearing all breakpoints...\n");
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for (i = 0; i < device_default->max_breakpoints; i++)
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device_setbrk(device_default, i, 0, 0, 0);
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|
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#ifdef DEBUG_GDB
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printc("starting GDB reader loop...\n");
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#endif
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gdb_reader_loop(&data);
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#ifdef DEBUG_GDB
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printc("... reader loop returned\n");
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#endif
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closesocket(client);
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|
return data.error ? -1 : 0;
|
|
}
|
|
|
|
int cmd_gdb(char **arg)
|
|
{
|
|
char *port_text = get_arg(arg);
|
|
address_t port = opdb_get_numeric("gdb_default_port");
|
|
|
|
if (port_text && expr_eval(port_text, &port) < 0) {
|
|
printc_err("gdb: can't parse port: %s\n", port_text);
|
|
return -1;
|
|
}
|
|
|
|
if (port <= 0 || port > 65535) {
|
|
printc_err("gdb: invalid port: %d\n", port);
|
|
return -1;
|
|
}
|
|
|
|
do {
|
|
if (gdb_server(port) < 0)
|
|
return -1;
|
|
} while (opdb_get_boolean("gdb_loop"));
|
|
|
|
return 0;
|
|
}
|