gwj / at91sam9263 · Files

/*
 * gdb server stub
 * 

 * 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 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
 */

#include "config.h"

#ifdef CONFIG_USER_ONLY
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include <fcntl.h>

#include "qemu.h"
#else

#include "vl.h"

#endif

#include "qemu_socket.h"
#ifdef _WIN32
/* XXX: these constants may be independent of the host ones even for Unix */
#ifndef SIGTRAP
#define SIGTRAP 5
#endif
#ifndef SIGINT
#define SIGINT 2
#endif
#else

#include <signal.h>

#endif

//#define DEBUG_GDB

enum RSState {
    RS_IDLE,
    RS_GETLINE,
    RS_CHKSUM1,
    RS_CHKSUM2,

    RS_SYSCALL,

};
typedef struct GDBState {

    CPUState *env; /* current CPU */

    enum RSState state; /* parsing state */

    char line_buf[4096];
    int line_buf_index;
    int line_csum;

    char last_packet[4100];
    int last_packet_len;

#ifdef CONFIG_USER_ONLY

    int fd;

    int running_state;

#else
    CharDriverState *chr;

#endif

} GDBState;

#ifdef CONFIG_USER_ONLY

/* XXX: This is not thread safe.  Do we care?  */
static int gdbserver_fd = -1;

/* XXX: remove this hack.  */
static GDBState gdbserver_state;

static int get_char(GDBState *s)

{
    uint8_t ch;
    int ret;

    for(;;) {

        ret = recv(s->fd, &ch, 1, 0);

        if (ret < 0) {
            if (errno != EINTR && errno != EAGAIN)
                return -1;
        } else if (ret == 0) {
            return -1;
        } else {
            break;
        }
    }
    return ch;
}

#endif

/* GDB stub state for use by semihosting syscalls.  */
static GDBState *gdb_syscall_state;
static gdb_syscall_complete_cb gdb_current_syscall_cb;

enum {
    GDB_SYS_UNKNOWN,
    GDB_SYS_ENABLED,
    GDB_SYS_DISABLED,
} gdb_syscall_mode;

/* If gdb is connected when the first semihosting syscall occurs then use
   remote gdb syscalls.  Otherwise use native file IO.  */
int use_gdb_syscalls(void)
{
    if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
        gdb_syscall_mode = (gdb_syscall_state ? GDB_SYS_ENABLED
                                              : GDB_SYS_DISABLED);
    }
    return gdb_syscall_mode == GDB_SYS_ENABLED;
}

static void put_buffer(GDBState *s, const uint8_t *buf, int len)

{

#ifdef CONFIG_USER_ONLY

    int ret;

    while (len > 0) {

        ret = send(s->fd, buf, len, 0);

        if (ret < 0) {
            if (errno != EINTR && errno != EAGAIN)
                return;
        } else {
            buf += ret;
            len -= ret;
        }
    }

#else
    qemu_chr_write(s->chr, buf, len);
#endif

}

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 */

static int put_packet(GDBState *s, char *buf)

{

    int len, csum, i;
    char *p;

#ifdef DEBUG_GDB
    printf("reply='%s'\n", buf);
#endif

    for(;;) {

        p = s->last_packet;
        *(p++) = '$';

        len = strlen(buf);

        memcpy(p, buf, len);
        p += len;

        csum = 0;
        for(i = 0; i < len; i++) {
            csum += buf[i];
        }

        *(p++) = '#';
        *(p++) = tohex((csum >> 4) & 0xf);
        *(p++) = tohex((csum) & 0xf);

        s->last_packet_len = p - s->last_packet;
        put_buffer(s, s->last_packet, s->last_packet_len);

#ifdef CONFIG_USER_ONLY
        i = get_char(s);
        if (i < 0)

            return -1;

        if (i == '+')

            break;

#else
        break;
#endif

    }
    return 0;
}

#if defined(TARGET_I386)

static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{

    uint32_t *registers = (uint32_t *)mem_buf;

    int i, fpus;

    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(&registers[i]);
    for(i = 36; i < 44; i++)
        tswapls(&registers[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(do_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(do_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]);

    do_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]);

    do_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 < 8; i++) {

        registers[i] = tswapl(env->gregs[i]);
    }
    /* fill in register window */
    for(i = 0; i < 24; i++) {
        registers[i + 8] = tswapl(env->regwptr[i]);
    }

#ifndef TARGET_SPARC64

    /* 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);

    {
	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

    /* fill in fprs */
    for (i = 0; i < 64; i += 2) {
	uint64_t tmp;

        tmp = (uint64_t)tswap32(*((uint32_t *)&env->fpr[i])) << 32;
        tmp |= tswap32(*((uint32_t *)&env->fpr[i + 1]));
        registers[i/2 + 32] = tmp;

    }

    registers[64] = tswapl(env->pc);
    registers[65] = tswapl(env->npc);
    registers[66] = tswapl(env->tstate[env->tl]);
    registers[67] = tswapl(env->fsr);
    registers[68] = tswapl(env->fprs);
    registers[69] = tswapl(env->y);
    return 70 * 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]);

    }

#ifndef TARGET_SPARC64

    /* 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]);

    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 < 64; i += 2) {
	*((uint32_t *)&env->fpr[i]) = tswap32(registers[i/2 + 32] >> 32);
	*((uint32_t *)&env->fpr[i + 1]) = tswap32(registers[i/2 + 32] & 0xffffffff);

    }

    env->pc = tswapl(registers[64]);
    env->npc = tswapl(registers[65]);
    env->tstate[env->tl] = tswapl(registers[66]);
    env->fsr = tswapl(registers[67]);
    env->fprs = tswapl(registers[68]);
    env->y = tswapl(registers[69]);

#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 (cpsr_read(env));

    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;

    cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);

}

#elif defined (TARGET_M68K)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
    int i;
    uint8_t *ptr;
    CPU_DoubleU u;

    ptr = mem_buf;
    /* D0-D7 */
    for (i = 0; i < 8; i++) {
        *(uint32_t *)ptr = tswapl(env->dregs[i]);
        ptr += 4;
    }
    /* A0-A7 */
    for (i = 0; i < 8; i++) {
        *(uint32_t *)ptr = tswapl(env->aregs[i]);
        ptr += 4;
    }
    *(uint32_t *)ptr = tswapl(env->sr);
    ptr += 4;
    *(uint32_t *)ptr = tswapl(env->pc);
    ptr += 4;
    /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
       ColdFire has 8-bit double precision registers.  */
    for (i = 0; i < 8; i++) {
        u.d = env->fregs[i];
        *(uint32_t *)ptr = tswap32(u.l.upper);
        *(uint32_t *)ptr = tswap32(u.l.lower);
    }
    /* FP control regs (not implemented).  */
    memset (ptr, 0, 3 * 4);
    ptr += 3 * 4;

    return ptr - mem_buf;
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
    int i;
    uint8_t *ptr;
    CPU_DoubleU u;

    ptr = mem_buf;
    /* D0-D7 */
    for (i = 0; i < 8; i++) {
        env->dregs[i] = tswapl(*(uint32_t *)ptr);
        ptr += 4;
    }
    /* A0-A7 */
    for (i = 0; i < 8; i++) {
        env->aregs[i] = tswapl(*(uint32_t *)ptr);
        ptr += 4;
    }
    env->sr = tswapl(*(uint32_t *)ptr);
    ptr += 4;
    env->pc = tswapl(*(uint32_t *)ptr);
    ptr += 4;
    /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
       ColdFire has 8-bit double precision registers.  */
    for (i = 0; i < 8; i++) {
        u.l.upper = tswap32(*(uint32_t *)ptr); 
        u.l.lower = tswap32(*(uint32_t *)ptr);
        env->fregs[i] = u.d;
    }
    /* FP control regs (not implemented).  */
    ptr += 3 * 4;
}

#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;

#ifdef MIPS_USES_FPU
    for (i = 0; i < 32; i++)
      {
        *(uint32_t *)ptr = tswapl(FPR_W (env, i));
        ptr += 4;
      }

    *(uint32_t *)ptr = tswapl(env->fcr31);
    ptr += 4;

    *(uint32_t *)ptr = tswapl(env->fcr0);
    ptr += 4;
#endif

    /* 32 FP registers, fsr, fir, fp.  Not yet implemented.  */

    /* what's 'fp' mean here?  */

    return ptr - mem_buf;
}

/* convert MIPS rounding mode in FCR31 to IEEE library */
static unsigned int ieee_rm[] =
  {
    float_round_nearest_even,
    float_round_to_zero,
    float_round_up,
    float_round_down
  };
#define RESTORE_ROUNDING_MODE \
    set_float_rounding_mode(ieee_rm[env->fcr31 & 3], &env->fp_status)

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;

#ifdef MIPS_USES_FPU
    for (i = 0; i < 32; i++)
      {
	FPR_W (env, i) = tswapl(*(uint32_t *)ptr);
        ptr += 4;
      }

    env->fcr31 = tswapl(*(uint32_t *)ptr) & 0x0183FFFF;
    ptr += 4;

    env->fcr0 = tswapl(*(uint32_t *)ptr);
    ptr += 4;

    /* set rounding mode */
    RESTORE_ROUNDING_MODE;

#ifndef CONFIG_SOFTFLOAT
    /* no floating point exception for native float */
    SET_FP_ENABLE(env->fcr31, 0);
#endif
#endif

}

#elif defined (TARGET_SH4)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
  uint32_t *ptr = (uint32_t *)mem_buf;
  int i;

#define SAVE(x) *ptr++=tswapl(x)

  if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
      for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
  } else {
      for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
  }
  for (i = 8; i < 16; i++) SAVE(env->gregs[i]);

  SAVE (env->pc);
  SAVE (env->pr);
  SAVE (env->gbr);
  SAVE (env->vbr);
  SAVE (env->mach);
  SAVE (env->macl);
  SAVE (env->sr);
  SAVE (0); /* TICKS */
  SAVE (0); /* STALLS */
  SAVE (0); /* CYCLES */
  SAVE (0); /* INSTS */
  SAVE (0); /* PLR */

  return ((uint8_t *)ptr - mem_buf);
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
  uint32_t *ptr = (uint32_t *)mem_buf;
  int i;

#define LOAD(x) (x)=*ptr++;

  if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
      for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
  } else {
      for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
  }
  for (i = 8; i < 16; i++) LOAD(env->gregs[i]);

  LOAD (env->pc);
  LOAD (env->pr);
  LOAD (env->gbr);
  LOAD (env->vbr);
  LOAD (env->mach);
  LOAD (env->macl);
  LOAD (env->sr);
}

#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

static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)

{
    const char *p;

    int ch, reg_size, type;

    char buf[4096];
    uint8_t mem_buf[2000];
    uint32_t *registers;

    target_ulong addr, len;

#ifdef DEBUG_GDB
    printf("command='%s'\n", line_buf);
#endif
    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 = strtoull(p, (char **)&p, 16);