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/*
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* gdb server stub
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "vl.h" |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netinet/tcp.h> |
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#include <signal.h> |
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//#define DEBUG_GDB
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enum RSState {
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RS_IDLE, |
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RS_GETLINE, |
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RS_CHKSUM1, |
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RS_CHKSUM2, |
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}; |
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static int gdbserver_fd; |
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typedef struct GDBState { |
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enum RSState state;
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int fd;
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char line_buf[4096]; |
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int line_buf_index;
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int line_csum;
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} GDBState; |
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static int get_char(GDBState *s) |
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{ |
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uint8_t ch; |
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int ret;
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for(;;) {
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ret = read(s->fd, &ch, 1);
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if (ret < 0) { |
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if (errno != EINTR && errno != EAGAIN)
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return -1; |
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} else if (ret == 0) { |
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return -1; |
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} else {
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break;
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} |
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} |
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return ch;
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} |
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static void put_buffer(GDBState *s, const uint8_t *buf, int len) |
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{ |
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int ret;
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while (len > 0) { |
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ret = write(s->fd, buf, len); |
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if (ret < 0) { |
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if (errno != EINTR && errno != EAGAIN)
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return;
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} else {
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buf += ret; |
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len -= ret; |
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} |
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} |
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} |
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static inline int fromhex(int v) |
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{ |
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if (v >= '0' && v <= '9') |
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return v - '0'; |
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else if (v >= 'A' && v <= 'F') |
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return v - 'A' + 10; |
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else if (v >= 'a' && v <= 'f') |
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return v - 'a' + 10; |
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else
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return 0; |
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} |
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static inline int tohex(int v) |
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{ |
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if (v < 10) |
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return v + '0'; |
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else
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return v - 10 + 'a'; |
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} |
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static void memtohex(char *buf, const uint8_t *mem, int len) |
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{ |
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int i, c;
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char *q;
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q = buf; |
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for(i = 0; i < len; i++) { |
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c = mem[i]; |
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*q++ = tohex(c >> 4);
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*q++ = tohex(c & 0xf);
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} |
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*q = '\0';
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} |
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static void hextomem(uint8_t *mem, const char *buf, int len) |
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{ |
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int i;
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for(i = 0; i < len; i++) { |
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mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
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buf += 2;
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} |
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} |
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/* return -1 if error, 0 if OK */
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static int put_packet(GDBState *s, char *buf) |
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{ |
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char buf1[3]; |
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int len, csum, ch, i;
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#ifdef DEBUG_GDB
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printf("reply='%s'\n", buf);
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#endif
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for(;;) {
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buf1[0] = '$'; |
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put_buffer(s, buf1, 1);
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len = strlen(buf); |
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put_buffer(s, buf, len); |
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csum = 0;
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for(i = 0; i < len; i++) { |
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csum += buf[i]; |
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} |
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buf1[0] = '#'; |
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buf1[1] = tohex((csum >> 4) & 0xf); |
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buf1[2] = tohex((csum) & 0xf); |
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put_buffer(s, buf1, 3);
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ch = get_char(s); |
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if (ch < 0) |
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return -1; |
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if (ch == '+') |
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break;
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} |
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return 0; |
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} |
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#if defined(TARGET_I386)
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf; |
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int i, fpus;
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for(i = 0; i < 8; i++) { |
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registers[i] = env->regs[i]; |
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} |
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registers[8] = env->eip;
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registers[9] = env->eflags;
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registers[10] = env->segs[R_CS].selector;
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registers[11] = env->segs[R_SS].selector;
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registers[12] = env->segs[R_DS].selector;
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registers[13] = env->segs[R_ES].selector;
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registers[14] = env->segs[R_FS].selector;
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registers[15] = env->segs[R_GS].selector;
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/* XXX: convert floats */
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for(i = 0; i < 8; i++) { |
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memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10); |
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} |
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registers[36] = env->fpuc;
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fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
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registers[37] = fpus;
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registers[38] = 0; /* XXX: convert tags */ |
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registers[39] = 0; /* fiseg */ |
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registers[40] = 0; /* fioff */ |
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registers[41] = 0; /* foseg */ |
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registers[42] = 0; /* fooff */ |
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registers[43] = 0; /* fop */ |
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for(i = 0; i < 16; i++) |
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tswapls(®isters[i]); |
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for(i = 36; i < 44; i++) |
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tswapls(®isters[i]); |
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return 44 * 4; |
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} |
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static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf; |
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int i;
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for(i = 0; i < 8; i++) { |
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env->regs[i] = tswapl(registers[i]); |
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} |
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env->eip = tswapl(registers[8]);
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env->eflags = tswapl(registers[9]);
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#if defined(CONFIG_USER_ONLY)
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#define LOAD_SEG(index, sreg)\
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if (tswapl(registers[index]) != env->segs[sreg].selector)\
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cpu_x86_load_seg(env, sreg, tswapl(registers[index])); |
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LOAD_SEG(10, R_CS);
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LOAD_SEG(11, R_SS);
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LOAD_SEG(12, R_DS);
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LOAD_SEG(13, R_ES);
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LOAD_SEG(14, R_FS);
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LOAD_SEG(15, R_GS);
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#endif
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} |
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#elif defined (TARGET_PPC)
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static uint32_t from_le32 (uint32_t *buf)
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{ |
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uint8_t *p = (uint8_t *)buf; |
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return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); |
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} |
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf, tmp; |
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int i;
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/* fill in gprs */
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for(i = 0; i < 32; i++) { |
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registers[i] = tswapl(env->gpr[i]); |
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} |
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/* fill in fprs */
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for (i = 0; i < 32; i++) { |
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registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i])); |
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registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1)); |
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} |
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/* nip, msr, ccr, lnk, ctr, xer, mq */
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registers[96] = tswapl(env->nip);
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registers[97] = tswapl(_load_msr(env));
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tmp = 0;
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for (i = 0; i < 8; i++) |
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tmp |= env->crf[i] << (32 - ((i + 1) * 4)); |
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registers[98] = tswapl(tmp);
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registers[99] = tswapl(env->lr);
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registers[100] = tswapl(env->ctr);
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registers[101] = tswapl(_load_xer(env));
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registers[102] = 0; |
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return 103 * 4; |
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} |
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static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
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{ |
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uint32_t *registers = (uint32_t *)mem_buf; |
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int i;
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/* fill in gprs */
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for (i = 0; i < 32; i++) { |
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env->gpr[i] = tswapl(registers[i]); |
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} |
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/* fill in fprs */
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for (i = 0; i < 32; i++) { |
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*((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]); |
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*((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]); |
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} |
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/* nip, msr, ccr, lnk, ctr, xer, mq */
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env->nip = tswapl(registers[96]);
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_store_msr(env, tswapl(registers[97]));
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registers[98] = tswapl(registers[98]); |
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for (i = 0; i < 8; i++) |
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env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF; |
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env->lr = tswapl(registers[99]);
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env->ctr = tswapl(registers[100]);
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_store_xer(env, tswapl(registers[101]));
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} |
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#elif defined (TARGET_SPARC)
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
283 |
{ |
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uint32_t *registers = (uint32_t *)mem_buf, tmp; |
285 |
int i;
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286 |
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/* fill in g0..g7 */
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for(i = 0; i < 7; i++) { |
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registers[i] = tswapl(env->gregs[i]); |
290 |
} |
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/* fill in register window */
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for(i = 0; i < 24; i++) { |
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registers[i + 8] = tswapl(env->regwptr[i]);
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} |
295 |
/* fill in fprs */
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for (i = 0; i < 32; i++) { |
297 |
registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
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} |
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/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
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registers[64] = tswapl(env->y);
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tmp = (0<<28) | (4<<24) | env->psr \ |
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| (env->psrs? PSR_S : 0) \
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303 |
| (env->psrs? PSR_PS : 0) \
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304 |
| (env->psret? PSR_ET : 0) \
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| env->cwp; |
306 |
registers[65] = tswapl(tmp);
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307 |
registers[66] = tswapl(env->wim);
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308 |
registers[67] = tswapl(env->tbr);
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registers[68] = tswapl(env->pc);
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310 |
registers[69] = tswapl(env->npc);
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311 |
registers[70] = tswapl(env->fsr);
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registers[71] = 0; /* csr */ |
313 |
registers[72] = 0; |
314 |
|
315 |
return 73 * 4; |
316 |
} |
317 |
|
318 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
319 |
{ |
320 |
uint32_t *registers = (uint32_t *)mem_buf, tmp; |
321 |
int i;
|
322 |
|
323 |
/* fill in g0..g7 */
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324 |
for(i = 0; i < 7; i++) { |
325 |
env->gregs[i] = tswapl(registers[i]); |
326 |
} |
327 |
/* fill in register window */
|
328 |
for(i = 0; i < 24; i++) { |
329 |
env->regwptr[i] = tswapl(registers[i]); |
330 |
} |
331 |
/* fill in fprs */
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332 |
for (i = 0; i < 32; i++) { |
333 |
*((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
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334 |
} |
335 |
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
|
336 |
env->y = tswapl(registers[64]);
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337 |
tmp = tswapl(registers[65]);
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338 |
env->psr = tmp & ~PSR_ICC; |
339 |
env->psrs = (tmp & PSR_S)? 1 : 0; |
340 |
env->psrps = (tmp & PSR_PS)? 1 : 0; |
341 |
env->psret = (tmp & PSR_ET)? 1 : 0; |
342 |
env->cwp = (tmp & PSR_CWP); |
343 |
env->wim = tswapl(registers[66]);
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344 |
env->tbr = tswapl(registers[67]);
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345 |
env->pc = tswapl(registers[68]);
|
346 |
env->npc = tswapl(registers[69]);
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347 |
env->fsr = tswapl(registers[70]);
|
348 |
} |
349 |
#else
|
350 |
|
351 |
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
352 |
{ |
353 |
return 0; |
354 |
} |
355 |
|
356 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
357 |
{ |
358 |
} |
359 |
|
360 |
#endif
|
361 |
|
362 |
/* port = 0 means default port */
|
363 |
static int gdb_handle_packet(GDBState *s, const char *line_buf) |
364 |
{ |
365 |
CPUState *env = cpu_single_env; |
366 |
const char *p; |
367 |
int ch, reg_size, type;
|
368 |
char buf[4096]; |
369 |
uint8_t mem_buf[2000];
|
370 |
uint32_t *registers; |
371 |
uint32_t addr, len; |
372 |
|
373 |
#ifdef DEBUG_GDB
|
374 |
printf("command='%s'\n", line_buf);
|
375 |
#endif
|
376 |
p = line_buf; |
377 |
ch = *p++; |
378 |
switch(ch) {
|
379 |
case '?': |
380 |
snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
381 |
put_packet(s, buf); |
382 |
break;
|
383 |
case 'c': |
384 |
if (*p != '\0') { |
385 |
addr = strtoul(p, (char **)&p, 16); |
386 |
#if defined(TARGET_I386)
|
387 |
env->eip = addr; |
388 |
#elif defined (TARGET_PPC)
|
389 |
env->nip = addr; |
390 |
#elif defined (TARGET_SPARC)
|
391 |
env->pc = addr; |
392 |
env->npc = addr + 4;
|
393 |
#endif
|
394 |
} |
395 |
vm_start(); |
396 |
break;
|
397 |
case 's': |
398 |
if (*p != '\0') { |
399 |
addr = strtoul(p, (char **)&p, 16); |
400 |
#if defined(TARGET_I386)
|
401 |
env->eip = addr; |
402 |
#elif defined (TARGET_PPC)
|
403 |
env->nip = addr; |
404 |
#elif defined (TARGET_SPARC)
|
405 |
env->pc = addr; |
406 |
env->npc = addr + 4;
|
407 |
#endif
|
408 |
} |
409 |
cpu_single_step(env, 1);
|
410 |
vm_start(); |
411 |
break;
|
412 |
case 'g': |
413 |
reg_size = cpu_gdb_read_registers(env, mem_buf); |
414 |
memtohex(buf, mem_buf, reg_size); |
415 |
put_packet(s, buf); |
416 |
break;
|
417 |
case 'G': |
418 |
registers = (void *)mem_buf;
|
419 |
len = strlen(p) / 2;
|
420 |
hextomem((uint8_t *)registers, p, len); |
421 |
cpu_gdb_write_registers(env, mem_buf, len); |
422 |
put_packet(s, "OK");
|
423 |
break;
|
424 |
case 'm': |
425 |
addr = strtoul(p, (char **)&p, 16); |
426 |
if (*p == ',') |
427 |
p++; |
428 |
len = strtoul(p, NULL, 16); |
429 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) |
430 |
memset(mem_buf, 0, len);
|
431 |
memtohex(buf, mem_buf, len); |
432 |
put_packet(s, buf); |
433 |
break;
|
434 |
case 'M': |
435 |
addr = strtoul(p, (char **)&p, 16); |
436 |
if (*p == ',') |
437 |
p++; |
438 |
len = strtoul(p, (char **)&p, 16); |
439 |
if (*p == ',') |
440 |
p++; |
441 |
hextomem(mem_buf, p, len); |
442 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) |
443 |
put_packet(s, "ENN");
|
444 |
else
|
445 |
put_packet(s, "OK");
|
446 |
break;
|
447 |
case 'Z': |
448 |
type = strtoul(p, (char **)&p, 16); |
449 |
if (*p == ',') |
450 |
p++; |
451 |
addr = strtoul(p, (char **)&p, 16); |
452 |
if (*p == ',') |
453 |
p++; |
454 |
len = strtoul(p, (char **)&p, 16); |
455 |
if (type == 0 || type == 1) { |
456 |
if (cpu_breakpoint_insert(env, addr) < 0) |
457 |
goto breakpoint_error;
|
458 |
put_packet(s, "OK");
|
459 |
} else {
|
460 |
breakpoint_error:
|
461 |
put_packet(s, "ENN");
|
462 |
} |
463 |
break;
|
464 |
case 'z': |
465 |
type = strtoul(p, (char **)&p, 16); |
466 |
if (*p == ',') |
467 |
p++; |
468 |
addr = strtoul(p, (char **)&p, 16); |
469 |
if (*p == ',') |
470 |
p++; |
471 |
len = strtoul(p, (char **)&p, 16); |
472 |
if (type == 0 || type == 1) { |
473 |
cpu_breakpoint_remove(env, addr); |
474 |
put_packet(s, "OK");
|
475 |
} else {
|
476 |
goto breakpoint_error;
|
477 |
} |
478 |
break;
|
479 |
default:
|
480 |
// unknown_command:
|
481 |
/* put empty packet */
|
482 |
buf[0] = '\0'; |
483 |
put_packet(s, buf); |
484 |
break;
|
485 |
} |
486 |
return RS_IDLE;
|
487 |
} |
488 |
|
489 |
static void gdb_vm_stopped(void *opaque, int reason) |
490 |
{ |
491 |
GDBState *s = opaque; |
492 |
char buf[256]; |
493 |
int ret;
|
494 |
|
495 |
/* disable single step if it was enable */
|
496 |
cpu_single_step(cpu_single_env, 0);
|
497 |
|
498 |
if (reason == EXCP_DEBUG)
|
499 |
ret = SIGTRAP; |
500 |
else
|
501 |
ret = 0;
|
502 |
snprintf(buf, sizeof(buf), "S%02x", ret); |
503 |
put_packet(s, buf); |
504 |
} |
505 |
|
506 |
static void gdb_read_byte(GDBState *s, int ch) |
507 |
{ |
508 |
int i, csum;
|
509 |
char reply[1]; |
510 |
|
511 |
if (vm_running) {
|
512 |
/* when the CPU is running, we cannot do anything except stop
|
513 |
it when receiving a char */
|
514 |
vm_stop(EXCP_INTERRUPT); |
515 |
} else {
|
516 |
switch(s->state) {
|
517 |
case RS_IDLE:
|
518 |
if (ch == '$') { |
519 |
s->line_buf_index = 0;
|
520 |
s->state = RS_GETLINE; |
521 |
} |
522 |
break;
|
523 |
case RS_GETLINE:
|
524 |
if (ch == '#') { |
525 |
s->state = RS_CHKSUM1; |
526 |
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
527 |
s->state = RS_IDLE; |
528 |
} else {
|
529 |
s->line_buf[s->line_buf_index++] = ch; |
530 |
} |
531 |
break;
|
532 |
case RS_CHKSUM1:
|
533 |
s->line_buf[s->line_buf_index] = '\0';
|
534 |
s->line_csum = fromhex(ch) << 4;
|
535 |
s->state = RS_CHKSUM2; |
536 |
break;
|
537 |
case RS_CHKSUM2:
|
538 |
s->line_csum |= fromhex(ch); |
539 |
csum = 0;
|
540 |
for(i = 0; i < s->line_buf_index; i++) { |
541 |
csum += s->line_buf[i]; |
542 |
} |
543 |
if (s->line_csum != (csum & 0xff)) { |
544 |
reply[0] = '-'; |
545 |
put_buffer(s, reply, 1);
|
546 |
s->state = RS_IDLE; |
547 |
} else {
|
548 |
reply[0] = '+'; |
549 |
put_buffer(s, reply, 1);
|
550 |
s->state = gdb_handle_packet(s, s->line_buf); |
551 |
} |
552 |
break;
|
553 |
} |
554 |
} |
555 |
} |
556 |
|
557 |
static int gdb_can_read(void *opaque) |
558 |
{ |
559 |
return 256; |
560 |
} |
561 |
|
562 |
static void gdb_read(void *opaque, const uint8_t *buf, int size) |
563 |
{ |
564 |
GDBState *s = opaque; |
565 |
int i;
|
566 |
if (size == 0) { |
567 |
/* end of connection */
|
568 |
qemu_del_vm_stop_handler(gdb_vm_stopped, s); |
569 |
qemu_del_fd_read_handler(s->fd); |
570 |
qemu_free(s); |
571 |
vm_start(); |
572 |
} else {
|
573 |
for(i = 0; i < size; i++) |
574 |
gdb_read_byte(s, buf[i]); |
575 |
} |
576 |
} |
577 |
|
578 |
static void gdb_accept(void *opaque, const uint8_t *buf, int size) |
579 |
{ |
580 |
GDBState *s; |
581 |
struct sockaddr_in sockaddr;
|
582 |
socklen_t len; |
583 |
int val, fd;
|
584 |
|
585 |
for(;;) {
|
586 |
len = sizeof(sockaddr);
|
587 |
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
588 |
if (fd < 0 && errno != EINTR) { |
589 |
perror("accept");
|
590 |
return;
|
591 |
} else if (fd >= 0) { |
592 |
break;
|
593 |
} |
594 |
} |
595 |
|
596 |
/* set short latency */
|
597 |
val = 1;
|
598 |
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
|
599 |
|
600 |
s = qemu_mallocz(sizeof(GDBState));
|
601 |
if (!s) {
|
602 |
close(fd); |
603 |
return;
|
604 |
} |
605 |
s->fd = fd; |
606 |
|
607 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
608 |
|
609 |
/* stop the VM */
|
610 |
vm_stop(EXCP_INTERRUPT); |
611 |
|
612 |
/* start handling I/O */
|
613 |
qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s); |
614 |
/* when the VM is stopped, the following callback is called */
|
615 |
qemu_add_vm_stop_handler(gdb_vm_stopped, s); |
616 |
} |
617 |
|
618 |
static int gdbserver_open(int port) |
619 |
{ |
620 |
struct sockaddr_in sockaddr;
|
621 |
int fd, val, ret;
|
622 |
|
623 |
fd = socket(PF_INET, SOCK_STREAM, 0);
|
624 |
if (fd < 0) { |
625 |
perror("socket");
|
626 |
return -1; |
627 |
} |
628 |
|
629 |
/* allow fast reuse */
|
630 |
val = 1;
|
631 |
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
|
632 |
|
633 |
sockaddr.sin_family = AF_INET; |
634 |
sockaddr.sin_port = htons(port); |
635 |
sockaddr.sin_addr.s_addr = 0;
|
636 |
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
637 |
if (ret < 0) { |
638 |
perror("bind");
|
639 |
return -1; |
640 |
} |
641 |
ret = listen(fd, 0);
|
642 |
if (ret < 0) { |
643 |
perror("listen");
|
644 |
return -1; |
645 |
} |
646 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
647 |
return fd;
|
648 |
} |
649 |
|
650 |
int gdbserver_start(int port) |
651 |
{ |
652 |
gdbserver_fd = gdbserver_open(port); |
653 |
if (gdbserver_fd < 0) |
654 |
return -1; |
655 |
/* accept connections */
|
656 |
qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL); |
657 |
return 0; |
658 |
} |