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 "qemu-common.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "gdbstub.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;

    uint8_t last_packet[4100];

    int last_packet_len;

    int signal;

#ifdef CONFIG_USER_ONLY

    int fd;

    int running_state;

#else
    CharDriverState *chr;

#endif

} GDBState;

/* By default use no IRQs and no timers while single stepping so as to
 * make single stepping like an ICE HW step.
 */
static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;

#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 == ECONNRESET)
                s->fd = -1;

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

            close(s->fd);
            s->fd = -1;

            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;
}

/* Resume execution.  */
static inline void gdb_continue(GDBState *s)
{
#ifdef CONFIG_USER_ONLY
    s->running_state = 1;
#else
    vm_start();
#endif
}

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;

    uint8_t *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, (uint8_t *)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)

#ifdef TARGET_X86_64
static const uint8_t gdb_x86_64_regs[16] = {
    R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP,
    8, 9, 10, 11, 12, 13, 14, 15,
};
#endif

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

    int i, fpus, nb_regs;
    uint8_t *p;

    p = mem_buf;

#ifdef TARGET_X86_64
    if (env->hflags & HF_CS64_MASK) {

        nb_regs = 16;
        for(i = 0; i < 16; i++) {
            *(uint64_t *)p = tswap64(env->regs[gdb_x86_64_regs[i]]);
            p += 8;

        }

        *(uint64_t *)p = tswap64(env->eip);
        p += 8;
    } else
#endif
    {
        nb_regs = 8;

        for(i = 0; i < 8; i++) {

            *(uint32_t *)p = tswap32(env->regs[i]);
            p += 4;

        }

        *(uint32_t *)p = tswap32(env->eip);
        p += 4;

    }

    *(uint32_t *)p = tswap32(env->eflags);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_CS].selector);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_SS].selector);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_DS].selector);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_ES].selector);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_FS].selector);
    p += 4;
    *(uint32_t *)p = tswap32(env->segs[R_GS].selector);
    p += 4;

    for(i = 0; i < 8; i++) {

        /* XXX: convert floats */
#ifdef USE_X86LDOUBLE
        memcpy(p, &env->fpregs[i], 10);
#else
        memset(p, 0, 10);
#endif
        p += 10;

    }

    *(uint32_t *)p = tswap32(env->fpuc); /* fctrl */
    p += 4;

    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;

    *(uint32_t *)p = tswap32(fpus); /* fstat */
    p += 4;
    *(uint32_t *)p = 0; /* ftag */
    p += 4;
    *(uint32_t *)p = 0; /* fiseg */
    p += 4;
    *(uint32_t *)p = 0; /* fioff */
    p += 4;
    *(uint32_t *)p = 0; /* foseg */
    p += 4;
    *(uint32_t *)p = 0; /* fooff */
    p += 4;
    *(uint32_t *)p = 0; /* fop */
    p += 4;
    for(i = 0; i < nb_regs; i++) {
        *(uint64_t *)p = tswap64(env->xmm_regs[i].XMM_Q(0));
        p += 8;
        *(uint64_t *)p = tswap64(env->xmm_regs[i].XMM_Q(1));
        p += 8;
    }
    *(uint32_t *)p = tswap32(env->mxcsr);
    p += 4;
    return p - mem_buf;
}

static inline void cpu_gdb_load_seg(CPUState *env, const uint8_t **pp, 
                                    int sreg)
{
    const uint8_t *p;
    uint32_t sel;
    p = *pp;
    sel = tswap32(*(uint32_t *)p);
    p += 4;
    if (sel != env->segs[sreg].selector) {
#if defined(CONFIG_USER_ONLY)
        cpu_x86_load_seg(env, sreg, sel);
#else
        /* XXX: do it with a debug function which does not raise an
           exception */
#endif
    }
    *pp = p;

}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{

    const uint8_t *p = mem_buf;
    int i, nb_regs;
    uint16_t fpus;

#ifdef TARGET_X86_64
    if (env->hflags & HF_CS64_MASK) {
        nb_regs = 16;
        for(i = 0; i < 16; i++) {
            env->regs[gdb_x86_64_regs[i]] = tswap64(*(uint64_t *)p);
            p += 8;
        }
        env->eip = tswap64(*(uint64_t *)p);
        p += 8;
    } else
#endif
    {
        nb_regs = 8;
        for(i = 0; i < 8; i++) {
            env->regs[i] = tswap32(*(uint32_t *)p);
            p += 4;
        }
        env->eip = tswap32(*(uint32_t *)p);
        p += 4;

    }

    env->eflags = tswap32(*(uint32_t *)p);
    p += 4;
    cpu_gdb_load_seg(env, &p, R_CS);
    cpu_gdb_load_seg(env, &p, R_SS);
    cpu_gdb_load_seg(env, &p, R_DS);
    cpu_gdb_load_seg(env, &p, R_ES);
    cpu_gdb_load_seg(env, &p, R_FS);
    cpu_gdb_load_seg(env, &p, R_GS);

    /* FPU state */
    for(i = 0; i < 8; i++) {
        /* XXX: convert floats */
#ifdef USE_X86LDOUBLE
        memcpy(&env->fpregs[i], p, 10);

#endif

        p += 10;
    }
    env->fpuc = tswap32(*(uint32_t *)p); /* fctrl */
    p += 4;
    fpus = tswap32(*(uint32_t *)p);
    p += 4;
    env->fpstt = (fpus >> 11) & 7;
    env->fpus = fpus & ~0x3800;
    p += 4 * 6;

    if (size >= ((p - mem_buf) + 16 * nb_regs + 4)) {
        /* SSE state */
        for(i = 0; i < nb_regs; i++) {
            env->xmm_regs[i].XMM_Q(0) = tswap64(*(uint64_t *)p);
            p += 8;
            env->xmm_regs[i].XMM_Q(1) = tswap64(*(uint64_t *)p);
            p += 8;
        }
        env->mxcsr = tswap32(*(uint32_t *)p);
        p += 4;
    }

}

#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(env->msr);

    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(ppc_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]);

    ppc_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]);

    ppc_store_xer(env, tswapl(registers[101]));

}
#elif defined (TARGET_SPARC)

#ifdef TARGET_ABI32
#define tswap_abi(val) tswap32(val &0xffffffff)
#else
#define tswap_abi(val) tswapl(val)
#endif

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

#ifdef TARGET_ABI32
    abi_ulong *registers = (abi_ulong *)mem_buf;
#else

    target_ulong *registers = (target_ulong *)mem_buf;

#endif

    int i;

    /* fill in g0..g7 */

    for(i = 0; i < 8; i++) {

        registers[i] = tswap_abi(env->gregs[i]);

    }
    /* fill in register window */
    for(i = 0; i < 24; i++) {

        registers[i + 8] = tswap_abi(env->regwptr[i]);

    }

#if !defined(TARGET_SPARC64) || defined(TARGET_ABI32)

    /* fill in fprs */
    for (i = 0; i < 32; i++) {

        registers[i + 32] = tswap_abi(*((uint32_t *)&env->fpr[i]));

    }
    /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */

    registers[64] = tswap_abi(env->y);

    {

        uint32_t tmp;

        tmp = GET_PSR(env);
        registers[65] = tswap32(tmp);

    }

    registers[66] = tswap_abi(env->wim);
    registers[67] = tswap_abi(env->tbr);
    registers[68] = tswap_abi(env->pc);
    registers[69] = tswap_abi(env->npc);
    registers[70] = tswap_abi(env->fsr);

    registers[71] = 0; /* csr */
    registers[72] = 0;

    return 73 * sizeof(uint32_t);

#else

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

        tmp = ((uint64_t)*(uint32_t *)&env->fpr[i]) << 32;
        tmp |= *(uint32_t *)&env->fpr[i + 1];
        registers[i / 2 + 32] = tswap64(tmp);

    }

    registers[64] = tswapl(env->pc);
    registers[65] = tswapl(env->npc);

    registers[66] = tswapl(((uint64_t)GET_CCR(env) << 32) |
                           ((env->asi & 0xff) << 24) |
                           ((env->pstate & 0xfff) << 8) |
                           GET_CWP64(env));

    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)
{

#ifdef TARGET_ABI32
    abi_ulong *registers = (abi_ulong *)mem_buf;
#else

    target_ulong *registers = (target_ulong *)mem_buf;

#endif

    int i;

    /* fill in g0..g7 */
    for(i = 0; i < 7; i++) {

        env->gregs[i] = tswap_abi(registers[i]);

    }
    /* fill in register window */
    for(i = 0; i < 24; i++) {

        env->regwptr[i] = tswap_abi(registers[i + 8]);

    }

#if !defined(TARGET_SPARC64) || defined(TARGET_ABI32)

    /* fill in fprs */
    for (i = 0; i < 32; i++) {

        *((uint32_t *)&env->fpr[i]) = tswap_abi(registers[i + 32]);

    }
    /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */

    env->y = tswap_abi(registers[64]);
    PUT_PSR(env, tswap_abi(registers[65]));
    env->wim = tswap_abi(registers[66]);
    env->tbr = tswap_abi(registers[67]);
    env->pc = tswap_abi(registers[68]);
    env->npc = tswap_abi(registers[69]);
    env->fsr = tswap_abi(registers[70]);

#else

    for (i = 0; i < 64; i += 2) {

        uint64_t tmp;

        tmp = tswap64(registers[i / 2 + 32]);
	*((uint32_t *)&env->fpr[i]) = tmp >> 32;
	*((uint32_t *)&env->fpr[i + 1]) = tmp & 0xffffffff;

    }

    env->pc = tswapl(registers[64]);
    env->npc = tswapl(registers[65]);

    {
        uint64_t tmp = tswapl(registers[66]);

        PUT_CCR(env, tmp >> 32);
        env->asi = (tmp >> 24) & 0xff;
        env->pstate = (tmp >> 8) & 0xfff;
        PUT_CWP64(env, tmp & 0xff);
    }

    env->fsr = tswapl(registers[67]);
    env->fprs = tswapl(registers[68]);
    env->y = tswapl(registers[69]);

#endif

}

#undef tswap_abi

#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++) {