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/*
* gdb server stub
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
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#include "vl.h"
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#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>
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//#define DEBUG_GDB
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enum RSState {
RS_IDLE,
RS_GETLINE,
RS_CHKSUM1,
RS_CHKSUM2,
};
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static int gdbserver_fd;
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typedef struct GDBState {
enum RSState state;
int fd;
char line_buf[4096];
int line_buf_index;
int line_csum;
} GDBState;
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static int get_char(GDBState *s)
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{
uint8_t ch;
int ret;
for(;;) {
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ret = read(s->fd, &ch, 1);
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if (ret < 0) {
if (errno != EINTR && errno != EAGAIN)
return -1;
} else if (ret == 0) {
return -1;
} else {
break;
}
}
return ch;
}
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static void put_buffer(GDBState *s, const uint8_t *buf, int len)
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{
int ret;
while (len > 0) {
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ret = write(s->fd, buf, len);
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if (ret < 0) {
if (errno != EINTR && errno != EAGAIN)
return;
} else {
buf += ret;
len -= ret;
}
}
}
static inline int fromhex(int v)
{
if (v >= '0' && v <= '9')
return v - '0';
else if (v >= 'A' && v <= 'F')
return v - 'A' + 10;
else if (v >= 'a' && v <= 'f')
return v - 'a' + 10;
else
return 0;
}
static inline int tohex(int v)
{
if (v < 10)
return v + '0';
else
return v - 10 + 'a';
}
static void memtohex(char *buf, const uint8_t *mem, int len)
{
int i, c;
char *q;
q = buf;
for(i = 0; i < len; i++) {
c = mem[i];
*q++ = tohex(c >> 4);
*q++ = tohex(c & 0xf);
}
*q = '\0';
}
static void hextomem(uint8_t *mem, const char *buf, int len)
{
int i;
for(i = 0; i < len; i++) {
mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
buf += 2;
}
}
/* return -1 if error, 0 if OK */
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static int put_packet(GDBState *s, char *buf)
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{
char buf1[3];
int len, csum, ch, i;
#ifdef DEBUG_GDB
printf("reply='%s'\n", buf);
#endif
for(;;) {
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;
for(i = 0; i < len; i++) {
csum += buf[i];
}
buf1[0] = '#';
buf1[1] = tohex((csum >> 4) & 0xf);
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)
return -1;
if (ch == '+')
break;
}
return 0;
}
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#if defined(TARGET_I386)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
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uint32_t *registers = (uint32_t *)mem_buf;
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int i, fpus;
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;
registers[9] = env->eflags;
registers[10] = env->segs[R_CS].selector;
registers[11] = env->segs[R_SS].selector;
registers[12] = env->segs[R_DS].selector;
registers[13] = env->segs[R_ES].selector;
registers[14] = env->segs[R_FS].selector;
registers[15] = env->segs[R_GS].selector;
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/* XXX: convert floats */
for(i = 0; i < 8; i++) {
memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
}
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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;
registers[38] = 0; /* XXX: convert tags */
registers[39] = 0; /* fiseg */
registers[40] = 0; /* fioff */
registers[41] = 0; /* foseg */
registers[42] = 0; /* fooff */
registers[43] = 0; /* fop */
for(i = 0; i < 16; i++)
tswapls(®isters[i]);
for(i = 36; i < 44; i++)
tswapls(®isters[i]);
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return 44 * 4;
}
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
uint32_t *registers = (uint32_t *)mem_buf;
int i;
for(i = 0; i < 8; i++) {
env->regs[i] = tswapl(registers[i]);
}
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env->eip = tswapl(registers[8]);
env->eflags = tswapl(registers[9]);
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#if defined(CONFIG_USER_ONLY)
#define LOAD_SEG(index, sreg)\
if (tswapl(registers[index]) != env->segs[sreg].selector)\
cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
LOAD_SEG(10, R_CS);
LOAD_SEG(11, R_SS);
LOAD_SEG(12, R_DS);
LOAD_SEG(13, R_ES);
LOAD_SEG(14, R_FS);
LOAD_SEG(15, R_GS);
#endif
}
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#elif defined (TARGET_PPC)
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static uint32_t from_le32 (uint32_t *buf)
{
uint8_t *p = (uint8_t *)buf;
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
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static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
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uint32_t *registers = (uint32_t *)mem_buf, tmp;
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int i;
/* 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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}
/* fill in fprs */
for (i = 0; i < 32; i++) {
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registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
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}
/* nip, msr, ccr, lnk, ctr, xer, mq */
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registers[96] = tswapl(env->nip);
registers[97] = tswapl(_load_msr(env));
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tmp = 0;
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);
registers[99] = tswapl(env->lr);
registers[100] = tswapl(env->ctr);
registers[101] = tswapl(_load_xer(env));
registers[102] = 0;
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return 103 * 4;
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}
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
uint32_t *registers = (uint32_t *)mem_buf;
int i;
/* fill in gprs */
for (i = 0; i < 32; i++) {
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env->gpr[i] = tswapl(registers[i]);
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}
/* fill in fprs */
for (i = 0; i < 32; i++) {
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*((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
*((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
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}
/* nip, msr, ccr, lnk, ctr, xer, mq */
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env->nip = tswapl(registers[96]);
_store_msr(env, tswapl(registers[97]));
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]);
env->ctr = tswapl(registers[100]);
_store_xer(env, tswapl(registers[101]));
}
#elif defined (TARGET_SPARC)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
uint32_t *registers = (uint32_t *)mem_buf, tmp;
int i;
/* fill in g0..g7 */
for(i = 0; i < 7; i++) {
registers[i] = tswapl(env->gregs[i]);
}
/* fill in register window */
for(i = 0; i < 24; i++) {
registers[i + 8] = tswapl(env->regwptr[i]);
}
/* fill in fprs */
for (i = 0; i < 32; i++) {
registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
}
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
registers[64] = tswapl(env->y);
tmp = (0<<28) | (4<<24) | env->psr \
| (env->psrs? PSR_S : 0) \
| (env->psrs? PSR_PS : 0) \
| (env->psret? PSR_ET : 0) \
| env->cwp;
registers[65] = tswapl(tmp);
registers[66] = tswapl(env->wim);
registers[67] = tswapl(env->tbr);
registers[68] = tswapl(env->pc);
registers[69] = tswapl(env->npc);
registers[70] = tswapl(env->fsr);
registers[71] = 0; /* csr */
registers[72] = 0;
return 73 * 4;
}
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
uint32_t *registers = (uint32_t *)mem_buf, tmp;
int i;
/* fill in g0..g7 */
for(i = 0; i < 7; i++) {
env->gregs[i] = tswapl(registers[i]);
}
/* fill in register window */
for(i = 0; i < 24; i++) {
env->regwptr[i] = tswapl(registers[i]);
}
/* fill in fprs */
for (i = 0; i < 32; i++) {
*((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
}
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
env->y = tswapl(registers[64]);
tmp = tswapl(registers[65]);
env->psr = tmp & ~PSR_ICC;
env->psrs = (tmp & PSR_S)? 1 : 0;
env->psrps = (tmp & PSR_PS)? 1 : 0;
env->psret = (tmp & PSR_ET)? 1 : 0;
env->cwp = (tmp & PSR_CWP);
env->wim = tswapl(registers[66]);
env->tbr = tswapl(registers[67]);
env->pc = tswapl(registers[68]);
env->npc = tswapl(registers[69]);
env->fsr = tswapl(registers[70]);
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}
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#else
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
return 0;
}
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
}
#endif
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/* port = 0 means default port */
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static int gdb_handle_packet(GDBState *s, const char *line_buf)
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364
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{
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365
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CPUState *env = cpu_single_env;
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366
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const char *p;
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367
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int ch, reg_size, type;
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368
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char buf[4096];
uint8_t mem_buf[2000];
uint32_t *registers;
uint32_t addr, len;
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#ifdef DEBUG_GDB
printf("command='%s'\n", line_buf);
#endif
p = line_buf;
ch = *p++;
switch(ch) {
case '?':
snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
put_packet(s, buf);
break;
case 'c':
if (*p != '\0') {
addr = strtoul(p, (char **)&p, 16);
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386
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#if defined(TARGET_I386)
|
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387
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env->eip = addr;
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388
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#elif defined (TARGET_PPC)
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env->nip = addr;
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#elif defined (TARGET_SPARC)
env->pc = addr;
env->npc = addr + 4;
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#endif
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}
vm_start();
break;
case 's':
if (*p != '\0') {
addr = strtoul(p, (char **)&p, 16);
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#if defined(TARGET_I386)
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401
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env->eip = addr;
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#elif defined (TARGET_PPC)
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env->nip = addr;
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#elif defined (TARGET_SPARC)
env->pc = addr;
env->npc = addr + 4;
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#endif
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}
cpu_single_step(env, 1);
vm_start();
break;
case 'g':
reg_size = cpu_gdb_read_registers(env, mem_buf);
memtohex(buf, mem_buf, reg_size);
put_packet(s, buf);
break;
case 'G':
registers = (void *)mem_buf;
len = strlen(p) / 2;
hextomem((uint8_t *)registers, p, len);
cpu_gdb_write_registers(env, mem_buf, len);
put_packet(s, "OK");
break;
case 'm':
addr = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
len = strtoul(p, NULL, 16);
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0)
memset(mem_buf, 0, len);
memtohex(buf, mem_buf, len);
put_packet(s, buf);
break;
case 'M':
addr = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
len = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
hextomem(mem_buf, p, len);
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
put_packet(s, "ENN");
else
put_packet(s, "OK");
break;
case 'Z':
type = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
addr = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
len = strtoul(p, (char **)&p, 16);
if (type == 0 || type == 1) {
if (cpu_breakpoint_insert(env, addr) < 0)
goto breakpoint_error;
put_packet(s, "OK");
} else {
breakpoint_error:
put_packet(s, "ENN");
}
break;
case 'z':
type = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
addr = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
len = strtoul(p, (char **)&p, 16);
if (type == 0 || type == 1) {
cpu_breakpoint_remove(env, addr);
put_packet(s, "OK");
} else {
goto breakpoint_error;
}
break;
default:
// unknown_command:
/* put empty packet */
buf[0] = '\0';
put_packet(s, buf);
break;
}
return RS_IDLE;
}
static void gdb_vm_stopped(void *opaque, int reason)
{
GDBState *s = opaque;
char buf[256];
int ret;
/* disable single step if it was enable */
cpu_single_step(cpu_single_env, 0);
if (reason == EXCP_DEBUG)
ret = SIGTRAP;
else
ret = 0;
snprintf(buf, sizeof(buf), "S%02x", ret);
put_packet(s, buf);
}
static void gdb_read_byte(GDBState *s, int ch)
{
int i, csum;
char reply[1];
if (vm_running) {
/* when the CPU is running, we cannot do anything except stop
it when receiving a char */
vm_stop(EXCP_INTERRUPT);
} else {
switch(s->state) {
case RS_IDLE:
if (ch == '$') {
s->line_buf_index = 0;
s->state = RS_GETLINE;
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}
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break;
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case RS_GETLINE:
if (ch == '#') {
s->state = RS_CHKSUM1;
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
s->state = RS_IDLE;
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} else {
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s->line_buf[s->line_buf_index++] = ch;
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}
break;
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|
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case RS_CHKSUM1:
s->line_buf[s->line_buf_index] = '\0';
s->line_csum = fromhex(ch) << 4;
s->state = RS_CHKSUM2;
break;
case RS_CHKSUM2:
s->line_csum |= fromhex(ch);
csum = 0;
for(i = 0; i < s->line_buf_index; i++) {
csum += s->line_buf[i];
}
if (s->line_csum != (csum & 0xff)) {
reply[0] = '-';
put_buffer(s, reply, 1);
s->state = RS_IDLE;
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} else {
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548
549
550
|
reply[0] = '+';
put_buffer(s, reply, 1);
s->state = gdb_handle_packet(s, s->line_buf);
|
|
551
552
|
}
break;
|
|
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
|
}
}
}
static int gdb_can_read(void *opaque)
{
return 256;
}
static void gdb_read(void *opaque, const uint8_t *buf, int size)
{
GDBState *s = opaque;
int i;
if (size == 0) {
/* end of connection */
qemu_del_vm_stop_handler(gdb_vm_stopped, s);
qemu_del_fd_read_handler(s->fd);
qemu_free(s);
vm_start();
} else {
for(i = 0; i < size; i++)
gdb_read_byte(s, buf[i]);
}
}
static void gdb_accept(void *opaque, const uint8_t *buf, int size)
{
GDBState *s;
struct sockaddr_in sockaddr;
socklen_t len;
int val, fd;
for(;;) {
len = sizeof(sockaddr);
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
if (fd < 0 && errno != EINTR) {
perror("accept");
return;
} else if (fd >= 0) {
|
|
592
593
594
|
break;
}
}
|
|
595
596
597
|
/* set short latency */
val = 1;
|
|
598
|
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
|
|
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
|
s = qemu_mallocz(sizeof(GDBState));
if (!s) {
close(fd);
return;
}
s->fd = fd;
fcntl(fd, F_SETFL, O_NONBLOCK);
/* stop the VM */
vm_stop(EXCP_INTERRUPT);
/* start handling I/O */
qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s);
/* when the VM is stopped, the following callback is called */
qemu_add_vm_stop_handler(gdb_vm_stopped, s);
}
static int gdbserver_open(int port)
{
struct sockaddr_in sockaddr;
int fd, val, ret;
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("socket");
return -1;
}
/* allow fast reuse */
val = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
sockaddr.sin_family = AF_INET;
sockaddr.sin_port = htons(port);
sockaddr.sin_addr.s_addr = 0;
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
if (ret < 0) {
perror("bind");
return -1;
}
ret = listen(fd, 0);
if (ret < 0) {
perror("listen");
return -1;
}
fcntl(fd, F_SETFL, O_NONBLOCK);
return fd;
}
int gdbserver_start(int port)
{
gdbserver_fd = gdbserver_open(port);
if (gdbserver_fd < 0)
return -1;
/* accept connections */
qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL);
|
|
657
658
|
return 0;
}
|