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gdbstub.c
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/*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "cpu.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#else
#include "monitor/monitor.h"
#include "chardev/char.h"
#include "chardev/char-fe.h"
#include "sysemu/sysemu.h"
#include "exec/gdbstub.h"
#endif
#define MAX_PACKET_LENGTH 4096
#include "qemu/sockets.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "exec/semihost.h"
#include "exec/exec-all.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
#else
#define GDB_ATTACHED "1"
#endif
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
if (cc->memory_rw_debug) {
return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
/* Return the GDB index for a given vCPU state.
*
* For user mode this is simply the thread id. In system mode GDB
* numbers CPUs from 1 as 0 is reserved as an "any cpu" index.
*/
static inline int cpu_gdb_index(CPUState *cpu)
{
#if defined(CONFIG_USER_ONLY)
TaskState *ts = (TaskState *) cpu->opaque;
return ts->ts_tid;
#else
return cpu->cpu_index + 1;
#endif
}
enum {
GDB_SIGNAL_0 = 0,
GDB_SIGNAL_INT = 2,
GDB_SIGNAL_QUIT = 3,
GDB_SIGNAL_TRAP = 5,
GDB_SIGNAL_ABRT = 6,
GDB_SIGNAL_ALRM = 14,
GDB_SIGNAL_IO = 23,
GDB_SIGNAL_XCPU = 24,
GDB_SIGNAL_UNKNOWN = 143
};
#ifdef CONFIG_USER_ONLY
/* Map target signal numbers to GDB protocol signal numbers and vice
* versa. For user emulation's currently supported systems, we can
* assume most signals are defined.
*/
static int gdb_signal_table[] = {
0,
TARGET_SIGHUP,
TARGET_SIGINT,
TARGET_SIGQUIT,
TARGET_SIGILL,
TARGET_SIGTRAP,
TARGET_SIGABRT,
-1, /* SIGEMT */
TARGET_SIGFPE,
TARGET_SIGKILL,
TARGET_SIGBUS,
TARGET_SIGSEGV,
TARGET_SIGSYS,
TARGET_SIGPIPE,
TARGET_SIGALRM,
TARGET_SIGTERM,
TARGET_SIGURG,
TARGET_SIGSTOP,
TARGET_SIGTSTP,
TARGET_SIGCONT,
TARGET_SIGCHLD,
TARGET_SIGTTIN,
TARGET_SIGTTOU,
TARGET_SIGIO,
TARGET_SIGXCPU,
TARGET_SIGXFSZ,
TARGET_SIGVTALRM,
TARGET_SIGPROF,
TARGET_SIGWINCH,
-1, /* SIGLOST */
TARGET_SIGUSR1,
TARGET_SIGUSR2,
#ifdef TARGET_SIGPWR
TARGET_SIGPWR,
#else
-1,
#endif
-1, /* SIGPOLL */
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
#ifdef __SIGRTMIN
__SIGRTMIN + 1,
__SIGRTMIN + 2,
__SIGRTMIN + 3,
__SIGRTMIN + 4,
__SIGRTMIN + 5,
__SIGRTMIN + 6,
__SIGRTMIN + 7,
__SIGRTMIN + 8,
__SIGRTMIN + 9,
__SIGRTMIN + 10,
__SIGRTMIN + 11,
__SIGRTMIN + 12,
__SIGRTMIN + 13,
__SIGRTMIN + 14,
__SIGRTMIN + 15,
__SIGRTMIN + 16,
__SIGRTMIN + 17,
__SIGRTMIN + 18,
__SIGRTMIN + 19,
__SIGRTMIN + 20,
__SIGRTMIN + 21,
__SIGRTMIN + 22,
__SIGRTMIN + 23,
__SIGRTMIN + 24,
__SIGRTMIN + 25,
__SIGRTMIN + 26,
__SIGRTMIN + 27,
__SIGRTMIN + 28,
__SIGRTMIN + 29,
__SIGRTMIN + 30,
__SIGRTMIN + 31,
-1, /* SIGCANCEL */
__SIGRTMIN,
__SIGRTMIN + 32,
__SIGRTMIN + 33,
__SIGRTMIN + 34,
__SIGRTMIN + 35,
__SIGRTMIN + 36,
__SIGRTMIN + 37,
__SIGRTMIN + 38,
__SIGRTMIN + 39,
__SIGRTMIN + 40,
__SIGRTMIN + 41,
__SIGRTMIN + 42,
__SIGRTMIN + 43,
__SIGRTMIN + 44,
__SIGRTMIN + 45,
__SIGRTMIN + 46,
__SIGRTMIN + 47,
__SIGRTMIN + 48,
__SIGRTMIN + 49,
__SIGRTMIN + 50,
__SIGRTMIN + 51,
__SIGRTMIN + 52,
__SIGRTMIN + 53,
__SIGRTMIN + 54,
__SIGRTMIN + 55,
__SIGRTMIN + 56,
__SIGRTMIN + 57,
__SIGRTMIN + 58,
__SIGRTMIN + 59,
__SIGRTMIN + 60,
__SIGRTMIN + 61,
__SIGRTMIN + 62,
__SIGRTMIN + 63,
__SIGRTMIN + 64,
__SIGRTMIN + 65,
__SIGRTMIN + 66,
__SIGRTMIN + 67,
__SIGRTMIN + 68,
__SIGRTMIN + 69,
__SIGRTMIN + 70,
__SIGRTMIN + 71,
__SIGRTMIN + 72,
__SIGRTMIN + 73,
__SIGRTMIN + 74,
__SIGRTMIN + 75,
__SIGRTMIN + 76,
__SIGRTMIN + 77,
__SIGRTMIN + 78,
__SIGRTMIN + 79,
__SIGRTMIN + 80,
__SIGRTMIN + 81,
__SIGRTMIN + 82,
__SIGRTMIN + 83,
__SIGRTMIN + 84,
__SIGRTMIN + 85,
__SIGRTMIN + 86,
__SIGRTMIN + 87,
__SIGRTMIN + 88,
__SIGRTMIN + 89,
__SIGRTMIN + 90,
__SIGRTMIN + 91,
__SIGRTMIN + 92,
__SIGRTMIN + 93,
__SIGRTMIN + 94,
__SIGRTMIN + 95,
-1, /* SIGINFO */
-1, /* UNKNOWN */
-1, /* DEFAULT */
-1,
-1,
-1,
-1,
-1,
-1
#endif
};
#else
/* In system mode we only need SIGINT and SIGTRAP; other signals
are not yet supported. */
enum {
TARGET_SIGINT = 2,
TARGET_SIGTRAP = 5
};
static int gdb_signal_table[] = {
-1,
-1,
TARGET_SIGINT,
-1,
-1,
TARGET_SIGTRAP
};
#endif
#ifdef CONFIG_USER_ONLY
static int target_signal_to_gdb (int sig)
{
int i;
for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
if (gdb_signal_table[i] == sig)
return i;
return GDB_SIGNAL_UNKNOWN;
}
#endif
static int gdb_signal_to_target (int sig)
{
if (sig < ARRAY_SIZE (gdb_signal_table))
return gdb_signal_table[sig];
else
return -1;
}
/* #define DEBUG_GDB */
#ifdef DEBUG_GDB
# define DEBUG_GDB_GATE 1
#else
# define DEBUG_GDB_GATE 0
#endif
#define gdb_debug(fmt, ...) do { \
if (DEBUG_GDB_GATE) { \
fprintf(stderr, "%s: " fmt, __func__, ## __VA_ARGS__); \
} \
} while (0)
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
gdb_reg_cb get_reg;
gdb_reg_cb set_reg;
const char *xml;
struct GDBRegisterState *next;
} GDBRegisterState;
enum RSState {
RS_INACTIVE,
RS_IDLE,
RS_GETLINE,
RS_GETLINE_ESC,
RS_GETLINE_RLE,
RS_CHKSUM1,
RS_CHKSUM2,
};
typedef struct GDBState {
CPUState *c_cpu; /* current CPU for step/continue ops */
CPUState *g_cpu; /* current CPU for other ops */
CPUState *query_cpu; /* for q{f|s}ThreadInfo */
enum RSState state; /* parsing state */
char line_buf[MAX_PACKET_LENGTH];
int line_buf_index;
int line_sum; /* running checksum */
int line_csum; /* checksum at the end of the packet */
uint8_t last_packet[MAX_PACKET_LENGTH + 4];
int last_packet_len;
int signal;
#ifdef CONFIG_USER_ONLY
int fd;
int running_state;
#else
CharBackend chr;
Chardev *mon_chr;
#endif
char syscall_buf[256];
gdb_syscall_complete_cb current_syscall_cb;
} 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;
static GDBState *gdbserver_state;
bool gdb_has_xml;
#ifdef CONFIG_USER_ONLY
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
static int get_char(GDBState *s)
{
uint8_t ch;
int ret;
for(;;) {
ret = qemu_recv(s->fd, &ch, 1, 0);
if (ret < 0) {
if (errno == ECONNRESET)
s->fd = -1;
if (errno != EINTR)
return -1;
} else if (ret == 0) {
close(s->fd);
s->fd = -1;
return -1;
} else {
break;
}
}
return ch;
}
#endif
static enum {
GDB_SYS_UNKNOWN,
GDB_SYS_ENABLED,
GDB_SYS_DISABLED,
} gdb_syscall_mode;
/* Decide if either remote gdb syscalls or native file IO should be used. */
int use_gdb_syscalls(void)
{
SemihostingTarget target = semihosting_get_target();
if (target == SEMIHOSTING_TARGET_NATIVE) {
/* -semihosting-config target=native */
return false;
} else if (target == SEMIHOSTING_TARGET_GDB) {
/* -semihosting-config target=gdb */
return true;
}
/* -semihosting-config target=auto */
/* On the first call check if gdb is connected and remember. */
if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
gdb_syscall_mode = (gdbserver_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
if (!runstate_needs_reset()) {
vm_start();
}
#endif
}
/*
* Resume execution, per CPU actions. For user-mode emulation it's
* equivalent to gdb_continue.
*/
static int gdb_continue_partial(GDBState *s, char *newstates)
{
CPUState *cpu;
int res = 0;
#ifdef CONFIG_USER_ONLY
/*
* This is not exactly accurate, but it's an improvement compared to the
* previous situation, where only one CPU would be single-stepped.
*/
CPU_FOREACH(cpu) {
if (newstates[cpu->cpu_index] == 's') {
cpu_single_step(cpu, sstep_flags);
}
}
s->running_state = 1;
#else
int flag = 0;
if (!runstate_needs_reset()) {
if (vm_prepare_start()) {
return 0;
}
CPU_FOREACH(cpu) {
switch (newstates[cpu->cpu_index]) {
case 0:
case 1:
break; /* nothing to do here */
case 's':
cpu_single_step(cpu, sstep_flags);
cpu_resume(cpu);
flag = 1;
break;
case 'c':
cpu_resume(cpu);
flag = 1;
break;
default:
res = -1;
break;
}
}
}
if (flag) {
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
}
#endif
return res;
}
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)
return;
} else {
buf += ret;
len -= ret;
}
}
#else
/* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks */
qemu_chr_fe_write_all(&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';
}
/* writes 2*len+1 bytes in buf */
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_binary(GDBState *s, const char *buf, int len)
{
int csum, i;
uint8_t *p;
for(;;) {
p = s->last_packet;
*(p++) = '$';
memcpy(p, buf, len);
p += len;
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
}
*(p++) = '#';
*(p++) = tohex((csum >> 4) & 0xf);
*(p++) = tohex((csum) & 0xf);
s->last_packet_len = p - s->last_packet;
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
#ifdef CONFIG_USER_ONLY
i = get_char(s);
if (i < 0)
return -1;
if (i == '+')
break;
#else
break;
#endif
}
return 0;
}
/* return -1 if error, 0 if OK */
static int put_packet(GDBState *s, const char *buf)
{
gdb_debug("reply='%s'\n", buf);
return put_packet_binary(s, buf, strlen(buf));
}
/* Encode data using the encoding for 'x' packets. */
static int memtox(char *buf, const char *mem, int len)
{
char *p = buf;
char c;
while (len--) {
c = *(mem++);
switch (c) {
case '#': case '$': case '*': case '}':
*(p++) = '}';
*(p++) = c ^ 0x20;
break;
default:
*(p++) = c;
break;
}
}
return p - buf;
}
static const char *get_feature_xml(const char *p, const char **newp,
CPUClass *cc)
{
size_t len;
int i;
const char *name;
static char target_xml[1024];
len = 0;
while (p[len] && p[len] != ':')
len++;
*newp = p + len;
name = NULL;
if (strncmp(p, "target.xml", len) == 0) {
/* Generate the XML description for this CPU. */
if (!target_xml[0]) {
GDBRegisterState *r;
CPUState *cpu = first_cpu;
pstrcat(target_xml, sizeof(target_xml),
"<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>");
if (cc->gdb_arch_name) {
gchar *arch = cc->gdb_arch_name(cpu);
pstrcat(target_xml, sizeof(target_xml), "<architecture>");
pstrcat(target_xml, sizeof(target_xml), arch);
pstrcat(target_xml, sizeof(target_xml), "</architecture>");
g_free(arch);
}
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
pstrcat(target_xml, sizeof(target_xml), cc->gdb_core_xml_file);
pstrcat(target_xml, sizeof(target_xml), "\"/>");
for (r = cpu->gdb_regs; r; r = r->next) {
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
pstrcat(target_xml, sizeof(target_xml), r->xml);
pstrcat(target_xml, sizeof(target_xml), "\"/>");
}
pstrcat(target_xml, sizeof(target_xml), "</target>");
}
return target_xml;
}
for (i = 0; ; i++) {
name = xml_builtin[i][0];
if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
break;
}
return name ? xml_builtin[i][1] : NULL;
}
static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_read_register(cpu, mem_buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->get_reg(env, mem_buf, reg - r->base_reg);
}
}
return 0;
}
static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_write_register(cpu, mem_buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->set_reg(env, mem_buf, reg - r->base_reg);
}
}
return 0;
}
/* Register a supplemental set of CPU registers. If g_pos is nonzero it
specifies the first register number and these registers are included in
a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
*/
void gdb_register_coprocessor(CPUState *cpu,
gdb_reg_cb get_reg, gdb_reg_cb set_reg,
int num_regs, const char *xml, int g_pos)
{
GDBRegisterState *s;
GDBRegisterState **p;
p = &cpu->gdb_regs;
while (*p) {
/* Check for duplicates. */
if (strcmp((*p)->xml, xml) == 0)
return;
p = &(*p)->next;
}
s = g_new0(GDBRegisterState, 1);
s->base_reg = cpu->gdb_num_regs;
s->num_regs = num_regs;
s->get_reg = get_reg;
s->set_reg = set_reg;
s->xml = xml;
/* Add to end of list. */
cpu->gdb_num_regs += num_regs;
*p = s;
if (g_pos) {
if (g_pos != s->base_reg) {
error_report("Error: Bad gdb register numbering for '%s', "
"expected %d got %d", xml, g_pos, s->base_reg);
} else {
cpu->gdb_num_g_regs = cpu->gdb_num_regs;
}
}
}
#ifndef CONFIG_USER_ONLY
/* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
{
static const int xlat[] = {
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE,
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ,
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
};
CPUClass *cc = CPU_GET_CLASS(cpu);
int cputype = xlat[gdbtype];
if (cc->gdb_stop_before_watchpoint) {
cputype |= BP_STOP_BEFORE_ACCESS;
}
return cputype;
}
#endif
static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_insert(cpu, addr, len,
xlat_gdb_type(cpu, type), NULL);
if (err) {
break;
}
}
return err;
#endif
default:
return -ENOSYS;
}
}
static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_remove(cpu, addr, len,
xlat_gdb_type(cpu, type));
if (err)
break;
}
return err;
#endif
default:
return -ENOSYS;
}
}
static void gdb_breakpoint_remove_all(void)
{
CPUState *cpu;
if (kvm_enabled()) {
kvm_remove_all_breakpoints(gdbserver_state->c_cpu);
return;
}
CPU_FOREACH(cpu) {
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
}
}
static void gdb_set_cpu_pc(GDBState *s, target_ulong pc)
{
CPUState *cpu = s->c_cpu;
cpu_synchronize_state(cpu);
cpu_set_pc(cpu, pc);
}
static CPUState *find_cpu(uint32_t thread_id)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu_gdb_index(cpu) == thread_id) {
return cpu;
}
}
return NULL;
}
static int is_query_packet(const char *p, const char *query, char separator)
{
unsigned int query_len = strlen(query);
return strncmp(p, query, query_len) == 0 &&
(p[query_len] == '\0' || p[query_len] == separator);
}
/**
* gdb_handle_vcont - Parses and handles a vCont packet.
* returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is
* a format error, 0 on success.
*/
static int gdb_handle_vcont(GDBState *s, const char *p)
{
int res, idx, signal = 0;
char cur_action;
char *newstates;
unsigned long tmp;
CPUState *cpu;
#ifdef CONFIG_USER_ONLY
int max_cpus = 1; /* global variable max_cpus exists only in system mode */
CPU_FOREACH(cpu) {
max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus;
}
#endif
/* uninitialised CPUs stay 0 */
newstates = g_new0(char, max_cpus);
/* mark valid CPUs with 1 */
CPU_FOREACH(cpu) {
newstates[cpu->cpu_index] = 1;
}
/*
* res keeps track of what error we are returning, with -ENOTSUP meaning
* that the command is unknown or unsupported, thus returning an empty
* packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid,
* or incorrect parameters passed.
*/
res = 0;
while (*p) {
if (*p++ != ';') {
res = -ENOTSUP;
goto out;
}
cur_action = *p++;
if (cur_action == 'C' || cur_action == 'S') {
cur_action = qemu_tolower(cur_action);
res = qemu_strtoul(p + 1, &p, 16, &tmp);
if (res) {
goto out;
}
signal = gdb_signal_to_target(tmp);
} else if (cur_action != 'c' && cur_action != 's') {
/* unknown/invalid/unsupported command */
res = -ENOTSUP;
goto out;
}
/* thread specification. special values: (none), -1 = all; 0 = any */
if ((p[0] == ':' && p[1] == '-' && p[2] == '1') || (p[0] != ':')) {
if (*p == ':') {
p += 3;
}
for (idx = 0; idx < max_cpus; idx++) {
if (newstates[idx] == 1) {
newstates[idx] = cur_action;
}
}
} else if (*p == ':') {
p++;
res = qemu_strtoul(p, &p, 16, &tmp);
if (res) {
goto out;
}
/* 0 means any thread, so we pick the first valid CPU */
cpu = tmp ? find_cpu(tmp) : first_cpu;
/* invalid CPU/thread specified */
if (!cpu) {
res = -EINVAL;
goto out;
}
/* only use if no previous match occourred */
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;
}
}
}
s->signal = signal;
gdb_continue_partial(s, newstates);
out:
g_free(newstates);
return res;
}
static int gdb_handle_packet(GDBState *s, const char *line_buf)
{
CPUState *cpu;
CPUClass *cc;
const char *p;
uint32_t thread;
int ch, reg_size, type, res;
uint8_t mem_buf[MAX_PACKET_LENGTH];
char buf[sizeof(mem_buf) + 1 /* trailing NUL */];
uint8_t *registers;
target_ulong addr, len;
gdb_debug("command='%s'\n", line_buf);
p = line_buf;
ch = *p++;
switch(ch) {
case '?':
/* TODO: Make this return the correct value for user-mode. */
snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP,
cpu_gdb_index(s->c_cpu));
put_packet(s, buf);
/* Remove all the breakpoints when this query is issued,
* because gdb is doing and initial connect and the state
* should be cleaned up.
*/
gdb_breakpoint_remove_all();
break;
case 'c':
if (*p != '\0') {
addr = strtoull(p, (char **)&p, 16);
gdb_set_cpu_pc(s, addr);
}