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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 void to_le32(uint8_t *p, int v) |
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{ |
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p[0] = v;
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p[1] = v >> 8; |
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p[2] = v >> 16; |
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p[3] = v >> 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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int i, fpus;
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for(i = 0; i < 8; i++) { |
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to_le32(mem_buf + i * 4, env->regs[i]);
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} |
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to_le32(mem_buf + 8 * 4, env->eip); |
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to_le32(mem_buf + 9 * 4, env->eflags); |
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to_le32(mem_buf + 10 * 4, env->segs[R_CS].selector); |
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to_le32(mem_buf + 11 * 4, env->segs[R_SS].selector); |
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to_le32(mem_buf + 12 * 4, env->segs[R_DS].selector); |
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to_le32(mem_buf + 13 * 4, env->segs[R_ES].selector); |
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to_le32(mem_buf + 14 * 4, env->segs[R_FS].selector); |
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to_le32(mem_buf + 15 * 4, 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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to_le32(mem_buf + 36 * 4, env->fpuc); |
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fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; |
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to_le32(mem_buf + 37 * 4, fpus); |
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to_le32(mem_buf + 38 * 4, 0); /* XXX: convert tags */ |
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to_le32(mem_buf + 39 * 4, 0); /* fiseg */ |
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to_le32(mem_buf + 40 * 4, 0); /* fioff */ |
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to_le32(mem_buf + 41 * 4, 0); /* foseg */ |
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to_le32(mem_buf + 42 * 4, 0); /* fooff */ |
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to_le32(mem_buf + 43 * 4, 0); /* fop */ |
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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 = registers[8];
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env->eflags = 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 void to_le32(uint8_t *p, int v) |
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{ |
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p[3] = v;
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p[2] = v >> 8; |
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p[1] = v >> 16; |
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p[0] = v >> 24; |
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} |
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
232 |
{ |
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uint32_t tmp; |
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int i;
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/* fill in gprs */
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for(i = 0; i < 8; i++) { |
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to_le32(mem_buf + i * 4, 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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to_le32(mem_buf + (i * 2) + 32, *((uint32_t *)&env->fpr[i])); |
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to_le32(mem_buf + (i * 2) + 33, *((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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to_le32(mem_buf + 96, tswapl(env->nip));
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to_le32(mem_buf + 97, tswapl(_load_msr()));
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to_le32(mem_buf + 98, 0); |
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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 * 4)); |
252 |
to_le32(mem_buf + 98, tmp);
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to_le32(mem_buf + 99, tswapl(env->lr));
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to_le32(mem_buf + 100, tswapl(env->ctr));
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to_le32(mem_buf + 101, tswapl(_load_xer()));
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to_le32(mem_buf + 102, 0); |
257 |
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return 102; |
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} |
260 |
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static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
262 |
{ |
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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(tswapl(registers[97]));
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registers[98] = tswapl(registers[98]); |
279 |
for (i = 0; i < 8; i++) |
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env->crf[i] = (registers[98] >> (32 - (i * 4))) & 0xF; |
281 |
env->lr = tswapl(registers[99]);
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env->ctr = tswapl(registers[100]);
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_store_xer(tswapl(registers[101]));
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} |
285 |
#else
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287 |
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) |
288 |
{ |
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return 0; |
290 |
} |
291 |
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292 |
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) |
293 |
{ |
294 |
} |
295 |
|
296 |
#endif
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297 |
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298 |
/* port = 0 means default port */
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299 |
static int gdb_handle_packet(GDBState *s, const char *line_buf) |
300 |
{ |
301 |
CPUState *env = cpu_single_env; |
302 |
const char *p; |
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int ch, reg_size, type;
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304 |
char buf[4096]; |
305 |
uint8_t mem_buf[2000];
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uint32_t *registers; |
307 |
uint32_t addr, len; |
308 |
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309 |
#ifdef DEBUG_GDB
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310 |
printf("command='%s'\n", line_buf);
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311 |
#endif
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312 |
p = line_buf; |
313 |
ch = *p++; |
314 |
switch(ch) {
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315 |
case '?': |
316 |
snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
317 |
put_packet(s, buf); |
318 |
break;
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319 |
case 'c': |
320 |
if (*p != '\0') { |
321 |
addr = strtoul(p, (char **)&p, 16); |
322 |
#if defined(TARGET_I386)
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323 |
env->eip = addr; |
324 |
#elif defined (TARGET_PPC)
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325 |
env->nip = addr; |
326 |
#endif
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327 |
} |
328 |
vm_start(); |
329 |
break;
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330 |
case 's': |
331 |
if (*p != '\0') { |
332 |
addr = strtoul(p, (char **)&p, 16); |
333 |
#if defined(TARGET_I386)
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334 |
env->eip = addr; |
335 |
#elif defined (TARGET_PPC)
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336 |
env->nip = addr; |
337 |
#endif
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338 |
} |
339 |
cpu_single_step(env, 1);
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340 |
vm_start(); |
341 |
break;
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342 |
case 'g': |
343 |
reg_size = cpu_gdb_read_registers(env, mem_buf); |
344 |
memtohex(buf, mem_buf, reg_size); |
345 |
put_packet(s, buf); |
346 |
break;
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347 |
case 'G': |
348 |
registers = (void *)mem_buf;
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349 |
len = strlen(p) / 2;
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350 |
hextomem((uint8_t *)registers, p, len); |
351 |
cpu_gdb_write_registers(env, mem_buf, len); |
352 |
put_packet(s, "OK");
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353 |
break;
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354 |
case 'm': |
355 |
addr = strtoul(p, (char **)&p, 16); |
356 |
if (*p == ',') |
357 |
p++; |
358 |
len = strtoul(p, NULL, 16); |
359 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) |
360 |
memset(mem_buf, 0, len);
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361 |
memtohex(buf, mem_buf, len); |
362 |
put_packet(s, buf); |
363 |
break;
|
364 |
case 'M': |
365 |
addr = strtoul(p, (char **)&p, 16); |
366 |
if (*p == ',') |
367 |
p++; |
368 |
len = strtoul(p, (char **)&p, 16); |
369 |
if (*p == ',') |
370 |
p++; |
371 |
hextomem(mem_buf, p, len); |
372 |
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) |
373 |
put_packet(s, "ENN");
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374 |
else
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375 |
put_packet(s, "OK");
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376 |
break;
|
377 |
case 'Z': |
378 |
type = strtoul(p, (char **)&p, 16); |
379 |
if (*p == ',') |
380 |
p++; |
381 |
addr = strtoul(p, (char **)&p, 16); |
382 |
if (*p == ',') |
383 |
p++; |
384 |
len = strtoul(p, (char **)&p, 16); |
385 |
if (type == 0 || type == 1) { |
386 |
if (cpu_breakpoint_insert(env, addr) < 0) |
387 |
goto breakpoint_error;
|
388 |
put_packet(s, "OK");
|
389 |
} else {
|
390 |
breakpoint_error:
|
391 |
put_packet(s, "ENN");
|
392 |
} |
393 |
break;
|
394 |
case 'z': |
395 |
type = strtoul(p, (char **)&p, 16); |
396 |
if (*p == ',') |
397 |
p++; |
398 |
addr = strtoul(p, (char **)&p, 16); |
399 |
if (*p == ',') |
400 |
p++; |
401 |
len = strtoul(p, (char **)&p, 16); |
402 |
if (type == 0 || type == 1) { |
403 |
cpu_breakpoint_remove(env, addr); |
404 |
put_packet(s, "OK");
|
405 |
} else {
|
406 |
goto breakpoint_error;
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407 |
} |
408 |
break;
|
409 |
default:
|
410 |
// unknown_command:
|
411 |
/* put empty packet */
|
412 |
buf[0] = '\0'; |
413 |
put_packet(s, buf); |
414 |
break;
|
415 |
} |
416 |
return RS_IDLE;
|
417 |
} |
418 |
|
419 |
static void gdb_vm_stopped(void *opaque, int reason) |
420 |
{ |
421 |
GDBState *s = opaque; |
422 |
char buf[256]; |
423 |
int ret;
|
424 |
|
425 |
/* disable single step if it was enable */
|
426 |
cpu_single_step(cpu_single_env, 0);
|
427 |
|
428 |
if (reason == EXCP_DEBUG)
|
429 |
ret = SIGTRAP; |
430 |
else
|
431 |
ret = 0;
|
432 |
snprintf(buf, sizeof(buf), "S%02x", ret); |
433 |
put_packet(s, buf); |
434 |
} |
435 |
|
436 |
static void gdb_read_byte(GDBState *s, int ch) |
437 |
{ |
438 |
int i, csum;
|
439 |
char reply[1]; |
440 |
|
441 |
if (vm_running) {
|
442 |
/* when the CPU is running, we cannot do anything except stop
|
443 |
it when receiving a char */
|
444 |
vm_stop(EXCP_INTERRUPT); |
445 |
} else {
|
446 |
switch(s->state) {
|
447 |
case RS_IDLE:
|
448 |
if (ch == '$') { |
449 |
s->line_buf_index = 0;
|
450 |
s->state = RS_GETLINE; |
451 |
} |
452 |
break;
|
453 |
case RS_GETLINE:
|
454 |
if (ch == '#') { |
455 |
s->state = RS_CHKSUM1; |
456 |
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
457 |
s->state = RS_IDLE; |
458 |
} else {
|
459 |
s->line_buf[s->line_buf_index++] = ch; |
460 |
} |
461 |
break;
|
462 |
case RS_CHKSUM1:
|
463 |
s->line_buf[s->line_buf_index] = '\0';
|
464 |
s->line_csum = fromhex(ch) << 4;
|
465 |
s->state = RS_CHKSUM2; |
466 |
break;
|
467 |
case RS_CHKSUM2:
|
468 |
s->line_csum |= fromhex(ch); |
469 |
csum = 0;
|
470 |
for(i = 0; i < s->line_buf_index; i++) { |
471 |
csum += s->line_buf[i]; |
472 |
} |
473 |
if (s->line_csum != (csum & 0xff)) { |
474 |
reply[0] = '-'; |
475 |
put_buffer(s, reply, 1);
|
476 |
s->state = RS_IDLE; |
477 |
} else {
|
478 |
reply[0] = '+'; |
479 |
put_buffer(s, reply, 1);
|
480 |
s->state = gdb_handle_packet(s, s->line_buf); |
481 |
} |
482 |
break;
|
483 |
} |
484 |
} |
485 |
} |
486 |
|
487 |
static int gdb_can_read(void *opaque) |
488 |
{ |
489 |
return 256; |
490 |
} |
491 |
|
492 |
static void gdb_read(void *opaque, const uint8_t *buf, int size) |
493 |
{ |
494 |
GDBState *s = opaque; |
495 |
int i;
|
496 |
if (size == 0) { |
497 |
/* end of connection */
|
498 |
qemu_del_vm_stop_handler(gdb_vm_stopped, s); |
499 |
qemu_del_fd_read_handler(s->fd); |
500 |
qemu_free(s); |
501 |
vm_start(); |
502 |
} else {
|
503 |
for(i = 0; i < size; i++) |
504 |
gdb_read_byte(s, buf[i]); |
505 |
} |
506 |
} |
507 |
|
508 |
static void gdb_accept(void *opaque, const uint8_t *buf, int size) |
509 |
{ |
510 |
GDBState *s; |
511 |
struct sockaddr_in sockaddr;
|
512 |
socklen_t len; |
513 |
int val, fd;
|
514 |
|
515 |
for(;;) {
|
516 |
len = sizeof(sockaddr);
|
517 |
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
518 |
if (fd < 0 && errno != EINTR) { |
519 |
perror("accept");
|
520 |
return;
|
521 |
} else if (fd >= 0) { |
522 |
break;
|
523 |
} |
524 |
} |
525 |
|
526 |
/* set short latency */
|
527 |
val = 1;
|
528 |
setsockopt(fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
|
529 |
|
530 |
s = qemu_mallocz(sizeof(GDBState));
|
531 |
if (!s) {
|
532 |
close(fd); |
533 |
return;
|
534 |
} |
535 |
s->fd = fd; |
536 |
|
537 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
538 |
|
539 |
/* stop the VM */
|
540 |
vm_stop(EXCP_INTERRUPT); |
541 |
|
542 |
/* start handling I/O */
|
543 |
qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s); |
544 |
/* when the VM is stopped, the following callback is called */
|
545 |
qemu_add_vm_stop_handler(gdb_vm_stopped, s); |
546 |
} |
547 |
|
548 |
static int gdbserver_open(int port) |
549 |
{ |
550 |
struct sockaddr_in sockaddr;
|
551 |
int fd, val, ret;
|
552 |
|
553 |
fd = socket(PF_INET, SOCK_STREAM, 0);
|
554 |
if (fd < 0) { |
555 |
perror("socket");
|
556 |
return -1; |
557 |
} |
558 |
|
559 |
/* allow fast reuse */
|
560 |
val = 1;
|
561 |
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
|
562 |
|
563 |
sockaddr.sin_family = AF_INET; |
564 |
sockaddr.sin_port = htons(port); |
565 |
sockaddr.sin_addr.s_addr = 0;
|
566 |
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
567 |
if (ret < 0) { |
568 |
perror("bind");
|
569 |
return -1; |
570 |
} |
571 |
ret = listen(fd, 0);
|
572 |
if (ret < 0) { |
573 |
perror("listen");
|
574 |
return -1; |
575 |
} |
576 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
577 |
return fd;
|
578 |
} |
579 |
|
580 |
int gdbserver_start(int port) |
581 |
{ |
582 |
gdbserver_fd = gdbserver_open(port); |
583 |
if (gdbserver_fd < 0) |
584 |
return -1; |
585 |
/* accept connections */
|
586 |
qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL); |
587 |
return 0; |
588 |
} |