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/*
* gdb server stub
*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
* 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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#ifdef CONFIG_USER_ONLY
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "qemu.h"
#else
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#include "vl.h"
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#endif
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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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/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
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typedef struct GDBState {
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CPUState *env; /* current CPU */
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enum RSState state; /* parsing state */
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int fd;
char line_buf[4096];
int line_buf_index;
int line_csum;
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#ifdef CONFIG_USER_ONLY
int running_state;
#endif
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} GDBState;
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#ifdef CONFIG_USER_ONLY
/* XXX: remove this hack. */
static GDBState gdbserver_state;
#endif
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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)
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);
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registers[97] = tswapl(do_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);
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registers[101] = tswapl(do_load_xer(env));
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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]);
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do_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]);
env->ctr = tswapl(registers[100]);
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do_store_xer(env, tswapl(registers[101]));
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}
#elif defined (TARGET_SPARC)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
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target_ulong *registers = (target_ulong *)mem_buf;
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int i;
/* fill in g0..g7 */
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for(i = 0; i < 8; i++) {
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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]));
}
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#ifndef TARGET_SPARC64
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/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
registers[64] = tswapl(env->y);
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{
target_ulong tmp;
tmp = GET_PSR(env);
registers[65] = tswapl(tmp);
}
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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;
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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
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}
static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
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target_ulong *registers = (target_ulong *)mem_buf;
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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++) {
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env->regwptr[i] = tswapl(registers[i + 8]);
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}
/* fill in fprs */
for (i = 0; i < 32; i++) {
*((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
}
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#ifndef TARGET_SPARC64
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/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
env->y = tswapl(registers[64]);
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PUT_PSR(env, tswapl(registers[65]));
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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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#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
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}
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#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). */
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*(uint32_t *)ptr = tswapl (cpsr_read(env));
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ptr += 4;
return ptr - mem_buf;
}
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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;
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cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);
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}
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#elif defined (TARGET_MIPS)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
int i;
uint8_t *ptr;
ptr = mem_buf;
for (i = 0; i < 32; i++)
{
*(uint32_t *)ptr = tswapl(env->gpr[i]);
ptr += 4;
}
*(uint32_t *)ptr = tswapl(env->CP0_Status);
ptr += 4;
*(uint32_t *)ptr = tswapl(env->LO);
ptr += 4;
*(uint32_t *)ptr = tswapl(env->HI);
ptr += 4;
*(uint32_t *)ptr = tswapl(env->CP0_BadVAddr);
ptr += 4;
*(uint32_t *)ptr = tswapl(env->CP0_Cause);
ptr += 4;
*(uint32_t *)ptr = tswapl(env->PC);
ptr += 4;
/* 32 FP registers, fsr, fir, fp. Not yet implemented. */
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;
for (i = 0; i < 32; i++)
{
env->gpr[i] = tswapl(*(uint32_t *)ptr);
ptr += 4;
}
env->CP0_Status = tswapl(*(uint32_t *)ptr);
ptr += 4;
env->LO = tswapl(*(uint32_t *)ptr);
ptr += 4;
env->HI = tswapl(*(uint32_t *)ptr);
ptr += 4;
env->CP0_BadVAddr = tswapl(*(uint32_t *)ptr);
ptr += 4;
env->CP0_Cause = tswapl(*(uint32_t *)ptr);
ptr += 4;
env->PC = tswapl(*(uint32_t *)ptr);
ptr += 4;
}
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#else
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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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static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
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{
const char *p;
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int ch, reg_size, type;
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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 '?':
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/* TODO: Make this return the correct value for user-mode. */
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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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#if defined(TARGET_I386)
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env->eip = addr;
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#elif defined (TARGET_PPC)
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env->nip = addr;
|
|
529
530
531
|
#elif defined (TARGET_SPARC)
env->pc = addr;
env->npc = addr + 4;
|
|
532
533
|
#elif defined (TARGET_ARM)
env->regs[15] = addr;
|
|
534
|
#endif
|
|
535
|
}
|
|
536
537
538
539
540
541
|
#ifdef CONFIG_USER_ONLY
s->running_state = 1;
#else
vm_start();
#endif
return RS_IDLE;
|
|
542
543
544
|
case 's':
if (*p != '\0') {
addr = strtoul(p, (char **)&p, 16);
|
|
545
|
#if defined(TARGET_I386)
|
|
546
|
env->eip = addr;
|
|
547
|
#elif defined (TARGET_PPC)
|
|
548
|
env->nip = addr;
|
|
549
550
551
|
#elif defined (TARGET_SPARC)
env->pc = addr;
env->npc = addr + 4;
|
|
552
553
|
#elif defined (TARGET_ARM)
env->regs[15] = addr;
|
|
554
|
#endif
|
|
555
556
|
}
cpu_single_step(env, 1);
|
|
557
558
559
560
561
562
|
#ifdef CONFIG_USER_ONLY
s->running_state = 1;
#else
vm_start();
#endif
return RS_IDLE;
|
|
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
|
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);
|
|
580
581
582
583
584
585
|
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
put_packet (s, "E14");
} else {
memtohex(buf, mem_buf, len);
put_packet(s, buf);
}
|
|
586
587
588
589
590
591
|
break;
case 'M':
addr = strtoul(p, (char **)&p, 16);
if (*p == ',')
p++;
len = strtoul(p, (char **)&p, 16);
|
|
592
|
if (*p == ':')
|
|
593
594
595
|
p++;
hextomem(mem_buf, p, len);
if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
|
|
596
|
put_packet(s, "E14");
|
|
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
|
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:
|
|
614
|
put_packet(s, "E22");
|
|
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
|
}
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;
}
|
|
642
643
|
extern void tb_flush(CPUState *env);
|
|
644
|
#ifndef CONFIG_USER_ONLY
|
|
645
646
647
648
649
650
651
|
static void gdb_vm_stopped(void *opaque, int reason)
{
GDBState *s = opaque;
char buf[256];
int ret;
/* disable single step if it was enable */
|
|
652
|
cpu_single_step(s->env, 0);
|
|
653
|
|
|
654
|
if (reason == EXCP_DEBUG) {
|
|
655
|
tb_flush(s->env);
|
|
656
|
ret = SIGTRAP;
|
|
657
658
659
|
} else if (reason == EXCP_INTERRUPT) {
ret = SIGINT;
} else {
|
|
660
|
ret = 0;
|
|
661
|
}
|
|
662
663
664
|
snprintf(buf, sizeof(buf), "S%02x", ret);
put_packet(s, buf);
}
|
|
665
|
#endif
|
|
666
|
|
|
667
|
static void gdb_read_byte(GDBState *s, int ch)
|
|
668
|
{
|
|
669
|
CPUState *env = s->env;
|
|
670
671
672
|
int i, csum;
char reply[1];
|
|
673
|
#ifndef CONFIG_USER_ONLY
|
|
674
675
676
677
|
if (vm_running) {
/* when the CPU is running, we cannot do anything except stop
it when receiving a char */
vm_stop(EXCP_INTERRUPT);
|
|
678
|
} else
|
|
679
|
#endif
|
|
680
|
{
|
|
681
682
683
684
685
|
switch(s->state) {
case RS_IDLE:
if (ch == '$') {
s->line_buf_index = 0;
s->state = RS_GETLINE;
|
|
686
|
}
|
|
687
|
break;
|
|
688
689
690
691
692
|
case RS_GETLINE:
if (ch == '#') {
s->state = RS_CHKSUM1;
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
s->state = RS_IDLE;
|
|
693
|
} else {
|
|
694
|
s->line_buf[s->line_buf_index++] = ch;
|
|
695
696
|
}
break;
|
|
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
|
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;
|
|
712
|
} else {
|
|
713
714
|
reply[0] = '+';
put_buffer(s, reply, 1);
|
|
715
|
s->state = gdb_handle_packet(s, env, s->line_buf);
|
|
716
717
|
}
break;
|
|
718
719
720
721
|
}
}
}
|
|
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
|
#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;
|
|
747
748
|
s->running_state = 0;
while (s->running_state == 0) {
|
|
749
750
751
752
753
754
|
n = read (s->fd, buf, 256);
if (n > 0)
{
int i;
for (i = 0; i < n; i++)
|
|
755
|
gdb_read_byte (s, buf[i]);
|
|
756
757
758
759
760
761
762
|
}
else if (n == 0 || errno != EAGAIN)
{
/* XXX: Connection closed. Should probably wait for annother
connection before continuing. */
return sig;
}
|
|
763
|
}
|
|
764
765
|
return sig;
}
|
|
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
|
/* 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);
}
|
|
782
|
#else
|
|
783
|
static void gdb_read(void *opaque)
|
|
784
785
|
{
GDBState *s = opaque;
|
|
786
787
788
789
790
791
|
int i, size;
uint8_t buf[4096];
size = read(s->fd, buf, sizeof(buf));
if (size < 0)
return;
|
|
792
793
794
|
if (size == 0) {
/* end of connection */
qemu_del_vm_stop_handler(gdb_vm_stopped, s);
|
|
795
|
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
|
|
796
797
798
799
|
qemu_free(s);
vm_start();
} else {
for(i = 0; i < size; i++)
|
|
800
|
gdb_read_byte(s, buf[i]);
|
|
801
802
803
|
}
}
|
|
804
805
|
#endif
|
|
806
|
static void gdb_accept(void *opaque)
|
|
807
808
809
810
811
812
813
814
815
816
817
818
819
|
{
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) {
|
|
820
821
822
|
break;
}
}
|
|
823
824
825
|
/* set short latency */
val = 1;
|
|
826
|
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
|
|
827
|
|
|
828
829
830
831
|
#ifdef CONFIG_USER_ONLY
s = &gdbserver_state;
memset (s, 0, sizeof (GDBState));
#else
|
|
832
833
834
835
836
|
s = qemu_mallocz(sizeof(GDBState));
if (!s) {
close(fd);
return;
}
|
|
837
|
#endif
|
|
838
|
s->env = first_cpu; /* XXX: allow to change CPU */
|
|
839
840
841
842
|
s->fd = fd;
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
843
|
#ifndef CONFIG_USER_ONLY
|
|
844
845
846
847
|
/* stop the VM */
vm_stop(EXCP_INTERRUPT);
/* start handling I/O */
|
|
848
|
qemu_set_fd_handler(s->fd, gdb_read, NULL, s);
|
|
849
850
|
/* when the VM is stopped, the following callback is called */
qemu_add_vm_stop_handler(gdb_vm_stopped, s);
|
|
851
|
#endif
|
|
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
|
}
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;
}
|
|
882
|
#ifndef CONFIG_USER_ONLY
|
|
883
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
884
|
#endif
|
|
885
886
887
888
889
890
891
892
893
|
return fd;
}
int gdbserver_start(int port)
{
gdbserver_fd = gdbserver_open(port);
if (gdbserver_fd < 0)
return -1;
/* accept connections */
|
|
894
|
#ifdef CONFIG_USER_ONLY
|
|
895
|
gdb_accept (NULL);
|
|
896
|
#else
|
|
897
|
qemu_set_fd_handler(gdbserver_fd, gdb_accept, NULL, NULL);
|
|
898
|
#endif
|
|
899
900
|
return 0;
}
|