/*
* gdb server stub
*
- * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003-2005 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 along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#ifdef CONFIG_USER_ONLY
#include <stdlib.h>
#include <stdio.h>
+#include <stdarg.h>
#include <string.h>
-#include <unistd.h>
#include <errno.h>
+#include <unistd.h>
+
+#include "qemu.h"
+#else
+#include "vl.h"
+#endif
+
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>
-#include "config.h"
-#include "cpu.h"
-#include "thunk.h"
-#include "exec-all.h"
-
//#define DEBUG_GDB
-int gdbstub_fd = -1;
+enum RSState {
+ RS_IDLE,
+ RS_GETLINE,
+ RS_CHKSUM1,
+ RS_CHKSUM2,
+};
+/* XXX: This is not thread safe. Do we care? */
+static int gdbserver_fd = -1;
-/* return 0 if OK */
-static int gdbstub_open(int port)
-{
- struct sockaddr_in sockaddr;
- socklen_t len;
- 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));
+typedef struct GDBState {
+ enum RSState state; /* parsing state */
+ int fd;
+ char line_buf[4096];
+ int line_buf_index;
+ int line_csum;
+#ifdef CONFIG_USER_ONLY
+ int running_state;
+#endif
+} GDBState;
- 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;
- }
-
- /* now wait for one connection */
- for(;;) {
- len = sizeof(sockaddr);
- gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len);
- if (gdbstub_fd < 0 && errno != EINTR) {
- perror("accept");
- return -1;
- } else if (gdbstub_fd >= 0) {
- break;
- }
- }
-
- /* set short latency */
- val = 1;
- setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
- return 0;
-}
+#ifdef CONFIG_USER_ONLY
+/* XXX: remove this hack. */
+static GDBState gdbserver_state;
+#endif
-static int get_char(void)
+static int get_char(GDBState *s)
{
uint8_t ch;
int ret;
for(;;) {
- ret = read(gdbstub_fd, &ch, 1);
+ ret = read(s->fd, &ch, 1);
if (ret < 0) {
if (errno != EINTR && errno != EAGAIN)
return -1;
return ch;
}
-static void put_buffer(const uint8_t *buf, int len)
+static void put_buffer(GDBState *s, const uint8_t *buf, int len)
{
int ret;
while (len > 0) {
- ret = write(gdbstub_fd, buf, len);
+ ret = write(s->fd, buf, len);
if (ret < 0) {
if (errno != EINTR && errno != EAGAIN)
return;
}
}
-/* return -1 if error or EOF */
-static int get_packet(char *buf, int buf_size)
-{
- int ch, len, csum, csum1;
- char reply[1];
-
- for(;;) {
- for(;;) {
- ch = get_char();
- if (ch < 0)
- return -1;
- if (ch == '$')
- break;
- }
- len = 0;
- csum = 0;
- for(;;) {
- ch = get_char();
- if (ch < 0)
- return -1;
- if (ch == '#')
- break;
- if (len > buf_size - 1)
- return -1;
- buf[len++] = ch;
- csum += ch;
- }
- buf[len] = '\0';
- ch = get_char();
- if (ch < 0)
- return -1;
- csum1 = fromhex(ch) << 4;
- ch = get_char();
- if (ch < 0)
- return -1;
- csum1 |= fromhex(ch);
- if ((csum & 0xff) != csum1) {
- reply[0] = '-';
- put_buffer(reply, 1);
- } else {
- reply[0] = '+';
- put_buffer(reply, 1);
- break;
- }
- }
-#ifdef DEBUG_GDB
- printf("command='%s'\n", buf);
-#endif
- return len;
-}
-
/* return -1 if error, 0 if OK */
-static int put_packet(char *buf)
+static int put_packet(GDBState *s, char *buf)
{
char buf1[3];
int len, csum, ch, i;
for(;;) {
buf1[0] = '$';
- put_buffer(buf1, 1);
+ put_buffer(s, buf1, 1);
len = strlen(buf);
- put_buffer(buf, len);
+ put_buffer(s, buf, len);
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
buf1[1] = tohex((csum >> 4) & 0xf);
buf1[2] = tohex((csum) & 0xf);
- put_buffer(buf1, 3);
+ put_buffer(s, buf1, 3);
- ch = get_char();
+ ch = get_char(s);
if (ch < 0)
return -1;
if (ch == '+')
return 0;
}
-static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write)
+#if defined(TARGET_I386)
+
+static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
- int l, flags;
- uint32_t page;
+ uint32_t *registers = (uint32_t *)mem_buf;
+ int i, fpus;
- while (len > 0) {
- page = addr & TARGET_PAGE_MASK;
- l = (page + TARGET_PAGE_SIZE) - addr;
- if (l > len)
- l = len;
- flags = page_get_flags(page);
- if (!(flags & PAGE_VALID))
- return -1;
- if (is_write) {
- if (!(flags & PAGE_WRITE))
- return -1;
- memcpy((uint8_t *)addr, buf, l);
- } else {
- if (!(flags & PAGE_READ))
- return -1;
- memcpy(buf, (uint8_t *)addr, l);
- }
- len -= l;
- buf += l;
- addr += l;
+ for(i = 0; i < 8; i++) {
+ registers[i] = env->regs[i];
+ }
+ 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;
+ /* XXX: convert floats */
+ for(i = 0; i < 8; i++) {
+ memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
+ }
+ registers[36] = env->fpuc;
+ fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
+ 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]);
+ 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]);
+ }
+ env->eip = tswapl(registers[8]);
+ env->eflags = tswapl(registers[9]);
+#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
+}
+
+#elif defined (TARGET_PPC)
+static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
+{
+ uint32_t *registers = (uint32_t *)mem_buf, tmp;
+ int i;
+
+ /* fill in gprs */
+ for(i = 0; i < 32; i++) {
+ registers[i] = tswapl(env->gpr[i]);
+ }
+ /* fill in fprs */
+ for (i = 0; i < 32; i++) {
+ registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
+ registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
+ }
+ /* nip, msr, ccr, lnk, ctr, xer, mq */
+ registers[96] = tswapl(env->nip);
+ registers[97] = tswapl(_load_msr(env));
+ tmp = 0;
+ for (i = 0; i < 8; i++)
+ tmp |= env->crf[i] << (32 - ((i + 1) * 4));
+ registers[98] = tswapl(tmp);
+ registers[99] = tswapl(env->lr);
+ registers[100] = tswapl(env->ctr);
+ registers[101] = tswapl(_load_xer(env));
+ registers[102] = 0;
+
+ return 103 * 4;
+}
+
+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++) {
+ env->gpr[i] = tswapl(registers[i]);
+ }
+ /* fill in fprs */
+ for (i = 0; i < 32; i++) {
+ *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
+ *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
}
+ /* nip, msr, ccr, lnk, ctr, xer, mq */
+ env->nip = tswapl(registers[96]);
+ _store_msr(env, tswapl(registers[97]));
+ registers[98] = tswapl(registers[98]);
+ for (i = 0; i < 8; i++)
+ env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
+ 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)
+{
+ target_ulong *registers = (target_ulong *)mem_buf;
+ 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]));
+ }
+#ifndef TARGET_SPARC64
+ /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
+ registers[64] = tswapl(env->y);
+ {
+ target_ulong tmp;
+
+ tmp = GET_PSR(env);
+ 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 * sizeof(target_ulong);
+#else
+ for (i = 0; i < 32; i += 2) {
+ registers[i/2 + 64] = tswapl(*((uint64_t *)&env->fpr[i]));
+ }
+ registers[81] = tswapl(env->pc);
+ registers[82] = tswapl(env->npc);
+ registers[83] = tswapl(env->tstate[env->tl]);
+ registers[84] = tswapl(env->fsr);
+ registers[85] = tswapl(env->fprs);
+ registers[86] = tswapl(env->y);
+ return 87 * sizeof(target_ulong);
+#endif
+}
+
+static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
+{
+ target_ulong *registers = (target_ulong *)mem_buf;
+ 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 + 8]);
+ }
+ /* fill in fprs */
+ for (i = 0; i < 32; i++) {
+ *((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
+ }
+#ifndef TARGET_SPARC64
+ /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
+ env->y = tswapl(registers[64]);
+ PUT_PSR(env, tswapl(registers[65]));
+ 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]);
+#else
+ for (i = 0; i < 32; i += 2) {
+ uint64_t tmp;
+ tmp = tswapl(registers[i/2 + 64]) << 32;
+ tmp |= tswapl(registers[i/2 + 64 + 1]);
+ *((uint64_t *)&env->fpr[i]) = tmp;
+ }
+ env->pc = tswapl(registers[81]);
+ env->npc = tswapl(registers[82]);
+ env->tstate[env->tl] = tswapl(registers[83]);
+ env->fsr = tswapl(registers[84]);
+ env->fprs = tswapl(registers[85]);
+ env->y = tswapl(registers[86]);
+#endif
+}
+#elif defined (TARGET_ARM)
+static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
+{
+ int i;
+ uint8_t *ptr;
+
+ ptr = mem_buf;
+ /* 16 core integer registers (4 bytes each). */
+ for (i = 0; i < 16; i++)
+ {
+ *(uint32_t *)ptr = tswapl(env->regs[i]);
+ ptr += 4;
+ }
+ /* 8 FPA registers (12 bytes each), FPS (4 bytes).
+ Not yet implemented. */
+ memset (ptr, 0, 8 * 12 + 4);
+ ptr += 8 * 12 + 4;
+ /* CPSR (4 bytes). */
+ *(uint32_t *)ptr = tswapl (env->cpsr);
+ ptr += 4;
+
+ return ptr - mem_buf;
+}
+
+static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
+{
+ int i;
+ uint8_t *ptr;
+
+ ptr = mem_buf;
+ /* Core integer registers. */
+ for (i = 0; i < 16; i++)
+ {
+ env->regs[i] = tswapl(*(uint32_t *)ptr);
+ ptr += 4;
+ }
+ /* Ignore FPA regs and scr. */
+ ptr += 8 * 12 + 4;
+ env->cpsr = tswapl(*(uint32_t *)ptr);
+}
+#else
+static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
+{
return 0;
}
-/* port = 0 means default port */
-int cpu_gdbstub(void *opaque, int (*main_loop)(void *opaque), int port)
+static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
+{
+}
+
+#endif
+
+static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
{
- CPUState *env;
const char *p;
- int ret, ch, nb_regs, i, type;
+ int ch, reg_size, type;
char buf[4096];
uint8_t mem_buf[2000];
uint32_t *registers;
uint32_t addr, len;
- printf("Waiting gdb connection on port %d\n", port);
- if (gdbstub_open(port) < 0)
- return -1;
- printf("Connected\n");
- for(;;) {
- ret = get_packet(buf, sizeof(buf));
- if (ret < 0)
- break;
- p = buf;
- ch = *p++;
- switch(ch) {
- case '?':
- snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
- put_packet(buf);
- break;
- case 'c':
- if (*p != '\0') {
- addr = strtoul(p, (char **)&p, 16);
- env = cpu_gdbstub_get_env(opaque);
-#if defined(TARGET_I386)
- env->eip = addr;
+#ifdef DEBUG_GDB
+ printf("command='%s'\n", line_buf);
#endif
- }
- ret = main_loop(opaque);
- if (ret == EXCP_DEBUG)
- ret = SIGTRAP;
- else
- ret = 0;
- snprintf(buf, sizeof(buf), "S%02x", ret);
- put_packet(buf);
- break;
- case 's':
- env = cpu_gdbstub_get_env(opaque);
- if (*p != '\0') {
- addr = strtoul(p, (char **)&p, 16);
+ p = line_buf;
+ ch = *p++;
+ switch(ch) {
+ case '?':
+ /* TODO: Make this return the correct value for user-mode. */
+ snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
+ put_packet(s, buf);
+ break;
+ case 'c':
+ if (*p != '\0') {
+ addr = strtoul(p, (char **)&p, 16);
#if defined(TARGET_I386)
- env->eip = addr;
+ env->eip = addr;
+#elif defined (TARGET_PPC)
+ env->nip = addr;
+#elif defined (TARGET_SPARC)
+ env->pc = addr;
+ env->npc = addr + 4;
#endif
- }
- cpu_single_step(env, 1);
- ret = main_loop(opaque);
- cpu_single_step(env, 0);
- if (ret == EXCP_DEBUG)
- ret = SIGTRAP;
- else
- ret = 0;
- snprintf(buf, sizeof(buf), "S%02x", ret);
- put_packet(buf);
- break;
- case 'g':
- env = cpu_gdbstub_get_env(opaque);
- registers = (void *)mem_buf;
-#if defined(TARGET_I386)
- for(i = 0; i < 8; i++) {
- registers[i] = tswapl(env->regs[i]);
- }
- 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;
- nb_regs = 16;
+ }
+#ifdef CONFIG_USER_ONLY
+ s->running_state = 1;
+#else
+ vm_start();
#endif
- memtohex(buf, (const uint8_t *)registers,
- sizeof(registers[0]) * nb_regs);
- put_packet(buf);
- break;
- case 'G':
- env = cpu_gdbstub_get_env(opaque);
- registers = (void *)mem_buf;
+ return RS_IDLE;
+ case 's':
+ if (*p != '\0') {
+ addr = strtoul(p, (char **)&p, 16);
#if defined(TARGET_I386)
- hextomem((uint8_t *)registers, p, 16 * 4);
- for(i = 0; i < 8; i++) {
- env->regs[i] = tswapl(registers[i]);
- }
- env->eip = registers[8];
- env->eflags = registers[9];
-#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);
+ env->eip = addr;
+#elif defined (TARGET_PPC)
+ env->nip = addr;
+#elif defined (TARGET_SPARC)
+ env->pc = addr;
+ env->npc = addr + 4;
#endif
- put_packet("OK");
- break;
- case 'm':
- addr = strtoul(p, (char **)&p, 16);
- if (*p == ',')
- p++;
- len = strtoul(p, NULL, 16);
- if (memory_rw(mem_buf, addr, len, 0) != 0)
- memset(mem_buf, 0, len);
- memtohex(buf, mem_buf, len);
- put_packet(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 (memory_rw(mem_buf, addr, len, 1) != 0)
- put_packet("ENN");
- else
- put_packet("OK");
+ }
+ cpu_single_step(env, 1);
+#ifdef CONFIG_USER_ONLY
+ s->running_state = 1;
+#else
+ vm_start();
+#endif
+ return RS_IDLE;
+ 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, "E14");
+ 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, "E22");
+ }
+ 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;
+}
+
+extern void tb_flush(CPUState *env);
+
+#ifndef CONFIG_USER_ONLY
+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) {
+ tb_flush(cpu_single_env);
+ ret = SIGTRAP;
+ }
+ else
+ ret = 0;
+ snprintf(buf, sizeof(buf), "S%02x", ret);
+ put_packet(s, buf);
+}
+#endif
+
+static void gdb_read_byte(GDBState *s, CPUState *env, int ch)
+{
+ int i, csum;
+ char reply[1];
+
+#ifndef CONFIG_USER_ONLY
+ if (vm_running) {
+ /* when the CPU is running, we cannot do anything except stop
+ it when receiving a char */
+ vm_stop(EXCP_INTERRUPT);
+ } else
+#endif
+ {
+ switch(s->state) {
+ case RS_IDLE:
+ if (ch == '$') {
+ s->line_buf_index = 0;
+ s->state = RS_GETLINE;
+ }
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) {
- env = cpu_gdbstub_get_env(opaque);
- if (cpu_breakpoint_insert(env, addr) < 0)
- goto breakpoint_error;
- put_packet("OK");
+ case RS_GETLINE:
+ if (ch == '#') {
+ s->state = RS_CHKSUM1;
+ } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
+ s->state = RS_IDLE;
} else {
- breakpoint_error:
- put_packet("ENN");
+ s->line_buf[s->line_buf_index++] = ch;
}
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) {
- env = cpu_gdbstub_get_env(opaque);
- cpu_breakpoint_remove(env, addr);
- put_packet("OK");
+ 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;
} else {
- goto breakpoint_error;
+ reply[0] = '+';
+ put_buffer(s, reply, 1);
+ s->state = gdb_handle_packet(s, env, s->line_buf);
}
break;
- default:
- /* put empty packet */
- buf[0] = '\0';
- put_packet(buf);
+ }
+ }
+}
+
+#ifdef CONFIG_USER_ONLY
+int
+gdb_handlesig (CPUState *env, int sig)
+{
+ GDBState *s;
+ char buf[256];
+ int n;
+
+ if (gdbserver_fd < 0)
+ return sig;
+
+ s = &gdbserver_state;
+
+ /* disable single step if it was enabled */
+ cpu_single_step(env, 0);
+ tb_flush(env);
+
+ if (sig != 0)
+ {
+ snprintf(buf, sizeof(buf), "S%02x", sig);
+ put_packet(s, buf);
+ }
+
+ sig = 0;
+ s->state = RS_IDLE;
+ s->running_state = 0;
+ while (s->running_state == 0) {
+ n = read (s->fd, buf, 256);
+ if (n > 0)
+ {
+ int i;
+
+ for (i = 0; i < n; i++)
+ gdb_read_byte (s, env, buf[i]);
+ }
+ else if (n == 0 || errno != EAGAIN)
+ {
+ /* XXX: Connection closed. Should probably wait for annother
+ connection before continuing. */
+ return sig;
+ }
+ }
+ return sig;
+}
+
+/* Tell the remote gdb that the process has exited. */
+void gdb_exit(CPUState *env, int code)
+{
+ GDBState *s;
+ char buf[4];
+
+ if (gdbserver_fd < 0)
+ return;
+
+ s = &gdbserver_state;
+
+ snprintf(buf, sizeof(buf), "W%02x", code);
+ put_packet(s, buf);
+}
+
+#else
+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, cpu_single_env, buf[i]);
+ }
+}
+
+#endif
+
+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) {
break;
}
}
+
+ /* set short latency */
+ val = 1;
+ setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
+
+#ifdef CONFIG_USER_ONLY
+ s = &gdbserver_state;
+ memset (s, 0, sizeof (GDBState));
+#else
+ s = qemu_mallocz(sizeof(GDBState));
+ if (!s) {
+ close(fd);
+ return;
+ }
+#endif
+ s->fd = fd;
+
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+
+#ifndef CONFIG_USER_ONLY
+ /* 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);
+#endif
+}
+
+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;
+ }
+#ifndef CONFIG_USER_ONLY
+ fcntl(fd, F_SETFL, O_NONBLOCK);
+#endif
+ return fd;
+}
+
+int gdbserver_start(int port)
+{
+ gdbserver_fd = gdbserver_open(port);
+ if (gdbserver_fd < 0)
+ return -1;
+ /* accept connections */
+#ifdef CONFIG_USER_ONLY
+ gdb_accept (NULL, NULL, 0);
+#else
+ qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL);
+#endif
return 0;
}
projects / mirror_qemu.git / blobdiff