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gdbstub.c
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gdbstub.c
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/*
* gdb server stub
*
* This implements a subset of the remote protocol as described in:
*
* https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html
*
* 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/>.
*
* SPDX-License-Identifier: LGPL-2.0+
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
#include "trace/trace-root.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"
#include "hw/cpu/cluster.h"
#include "hw/boards.h"
#endif
#define MAX_PACKET_LENGTH 4096
#include "qemu/sockets.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "sysemu/runstate.h"
#include "hw/semihosting/semihost.h"
#include "exec/exec-all.h"
#include "sysemu/replay.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
#else
#define GDB_ATTACHED "1"
#endif
#ifndef CONFIG_USER_ONLY
static int phy_memory_mode;
#endif
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
CPUClass *cc;
#ifndef CONFIG_USER_ONLY
if (phy_memory_mode) {
if (is_write) {
cpu_physical_memory_write(addr, buf, len);
} else {
cpu_physical_memory_read(addr, buf, len);
}
return 0;
}
#endif
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;
}
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
gdb_get_reg_cb get_reg;
gdb_set_reg_cb set_reg;
const char *xml;
struct GDBRegisterState *next;
} GDBRegisterState;
typedef struct GDBProcess {
uint32_t pid;
bool attached;
char target_xml[1024];
} GDBProcess;
enum RSState {
RS_INACTIVE,
RS_IDLE,
RS_GETLINE,
RS_GETLINE_ESC,
RS_GETLINE_RLE,
RS_CHKSUM1,
RS_CHKSUM2,
};
typedef struct GDBState {
bool init; /* have we been initialised? */
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 */
GByteArray *last_packet;
int signal;
#ifdef CONFIG_USER_ONLY
int fd;
char *socket_path;
int running_state;
#else
CharBackend chr;
Chardev *mon_chr;
#endif
bool multiprocess;
GDBProcess *processes;
int process_num;
char syscall_buf[256];
gdb_syscall_complete_cb current_syscall_cb;
GString *str_buf;
GByteArray *mem_buf;
} 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;
/* Retrieves flags for single step mode. */
static int get_sstep_flags(void)
{
/*
* In replay mode all events written into the log should be replayed.
* That is why NOIRQ flag is removed in this mode.
*/
if (replay_mode != REPLAY_MODE_NONE) {
return SSTEP_ENABLE;
} else {
return sstep_flags;
}
}
static GDBState gdbserver_state;
static void init_gdbserver_state(void)
{
g_assert(!gdbserver_state.init);
memset(&gdbserver_state, 0, sizeof(GDBState));
gdbserver_state.init = true;
gdbserver_state.str_buf = g_string_new(NULL);
gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH);
gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4);
}
#ifndef CONFIG_USER_ONLY
static void reset_gdbserver_state(void)
{
g_free(gdbserver_state.processes);
gdbserver_state.processes = NULL;
gdbserver_state.process_num = 0;
}
#endif
bool gdb_has_xml;
#ifdef CONFIG_USER_ONLY
static int get_char(void)
{
uint8_t ch;
int ret;
for(;;) {
ret = qemu_recv(gdbserver_state.fd, &ch, 1, 0);
if (ret < 0) {
if (errno == ECONNRESET)
gdbserver_state.fd = -1;
if (errno != EINTR)
return -1;
} else if (ret == 0) {
close(gdbserver_state.fd);
gdbserver_state.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.init ?
GDB_SYS_ENABLED : GDB_SYS_DISABLED;
}
return gdb_syscall_mode == GDB_SYS_ENABLED;
}
/* Resume execution. */
static inline void gdb_continue(void)
{
#ifdef CONFIG_USER_ONLY
gdbserver_state.running_state = 1;
trace_gdbstub_op_continue();
#else
if (!runstate_needs_reset()) {
trace_gdbstub_op_continue();
vm_start();
}
#endif
}
/*
* Resume execution, per CPU actions. For user-mode emulation it's
* equivalent to gdb_continue.
*/
static int gdb_continue_partial(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') {
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, sstep_flags);
}
}
gdbserver_state.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':
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, get_sstep_flags());
cpu_resume(cpu);
flag = 1;
break;
case 'c':
trace_gdbstub_op_continue_cpu(cpu->cpu_index);
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(const uint8_t *buf, int len)
{
#ifdef CONFIG_USER_ONLY
int ret;
while (len > 0) {
ret = send(gdbserver_state.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(&gdbserver_state.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(GString *buf, const uint8_t *mem, int len)
{
int i, c;
for(i = 0; i < len; i++) {
c = mem[i];
g_string_append_c(buf, tohex(c >> 4));
g_string_append_c(buf, tohex(c & 0xf));
}
g_string_append_c(buf, '\0');
}
static void hextomem(GByteArray *mem, const char *buf, int len)
{
int i;
for(i = 0; i < len; i++) {
guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]);
g_byte_array_append(mem, &byte, 1);
buf += 2;
}
}
static void hexdump(const char *buf, int len,
void (*trace_fn)(size_t ofs, char const *text))
{
char line_buffer[3 * 16 + 4 + 16 + 1];
size_t i;
for (i = 0; i < len || (i & 0xF); ++i) {
size_t byte_ofs = i & 15;
if (byte_ofs == 0) {
memset(line_buffer, ' ', 3 * 16 + 4 + 16);
line_buffer[3 * 16 + 4 + 16] = 0;
}
size_t col_group = (i >> 2) & 3;
size_t hex_col = byte_ofs * 3 + col_group;
size_t txt_col = 3 * 16 + 4 + byte_ofs;
if (i < len) {
char value = buf[i];
line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF);
line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF);
line_buffer[txt_col + 0] = (value >= ' ' && value < 127)
? value
: '.';
}
if (byte_ofs == 0xF)
trace_fn(i & -16, line_buffer);
}
}
/* return -1 if error, 0 if OK */
static int put_packet_binary(const char *buf, int len, bool dump)
{
int csum, i;
uint8_t footer[3];
if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) {
hexdump(buf, len, trace_gdbstub_io_binaryreply);
}
for(;;) {
g_byte_array_set_size(gdbserver_state.last_packet, 0);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) "$", 1);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) buf, len);
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
}
footer[0] = '#';
footer[1] = tohex((csum >> 4) & 0xf);
footer[2] = tohex((csum) & 0xf);
g_byte_array_append(gdbserver_state.last_packet, footer, 3);
put_buffer(gdbserver_state.last_packet->data,
gdbserver_state.last_packet->len);
#ifdef CONFIG_USER_ONLY
i = get_char();
if (i < 0)
return -1;
if (i == '+')
break;
#else
break;
#endif
}
return 0;
}
/* return -1 if error, 0 if OK */
static int put_packet(const char *buf)
{
trace_gdbstub_io_reply(buf);
return put_packet_binary(buf, strlen(buf), false);
}
static void put_strbuf(void)
{
put_packet(gdbserver_state.str_buf->str);
}
/* Encode data using the encoding for 'x' packets. */
static void memtox(GString *buf, const char *mem, int len)
{
char c;
while (len--) {
c = *(mem++);
switch (c) {
case '#': case '$': case '*': case '}':
g_string_append_c(buf, '}');
g_string_append_c(buf, c ^ 0x20);
break;
default:
g_string_append_c(buf, c);
break;
}
}
}
static uint32_t gdb_get_cpu_pid(CPUState *cpu)
{
/* TODO: In user mode, we should use the task state PID */
if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) {
/* Return the default process' PID */
int index = gdbserver_state.process_num - 1;
return gdbserver_state.processes[index].pid;
}
return cpu->cluster_index + 1;
}
static GDBProcess *gdb_get_process(uint32_t pid)
{
int i;
if (!pid) {
/* 0 means any process, we take the first one */
return &gdbserver_state.processes[0];
}
for (i = 0; i < gdbserver_state.process_num; i++) {
if (gdbserver_state.processes[i].pid == pid) {
return &gdbserver_state.processes[i];
}
}
return NULL;
}
static GDBProcess *gdb_get_cpu_process(CPUState *cpu)
{
return gdb_get_process(gdb_get_cpu_pid(cpu));
}
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 CPUState *get_first_cpu_in_process(GDBProcess *process)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (gdb_get_cpu_pid(cpu) == process->pid) {
return cpu;
}
}
return NULL;
}
static CPUState *gdb_next_cpu_in_process(CPUState *cpu)
{
uint32_t pid = gdb_get_cpu_pid(cpu);
cpu = CPU_NEXT(cpu);
while (cpu) {
if (gdb_get_cpu_pid(cpu) == pid) {
break;
}
cpu = CPU_NEXT(cpu);
}
return cpu;
}
/* Return the cpu following @cpu, while ignoring unattached processes. */
static CPUState *gdb_next_attached_cpu(CPUState *cpu)
{
cpu = CPU_NEXT(cpu);
while (cpu) {
if (gdb_get_cpu_process(cpu)->attached) {
break;
}
cpu = CPU_NEXT(cpu);
}
return cpu;
}
/* Return the first attached cpu */
static CPUState *gdb_first_attached_cpu(void)
{
CPUState *cpu = first_cpu;
GDBProcess *process = gdb_get_cpu_process(cpu);
if (!process->attached) {
return gdb_next_attached_cpu(cpu);
}
return cpu;
}
static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid)
{
GDBProcess *process;
CPUState *cpu;
if (!pid && !tid) {
/* 0 means any process/thread, we take the first attached one */
return gdb_first_attached_cpu();
} else if (pid && !tid) {
/* any thread in a specific process */
process = gdb_get_process(pid);
if (process == NULL) {
return NULL;
}
if (!process->attached) {
return NULL;
}
return get_first_cpu_in_process(process);
} else {
/* a specific thread */
cpu = find_cpu(tid);
if (cpu == NULL) {
return NULL;
}
process = gdb_get_cpu_process(cpu);
if (pid && process->pid != pid) {
return NULL;
}
if (!process->attached) {
return NULL;
}
return cpu;
}
}
static const char *get_feature_xml(const char *p, const char **newp,
GDBProcess *process)
{
size_t len;
int i;
const char *name;
CPUState *cpu = get_first_cpu_in_process(process);
CPUClass *cc = CPU_GET_CLASS(cpu);
len = 0;
while (p[len] && p[len] != ':')
len++;
*newp = p + len;
name = NULL;
if (strncmp(p, "target.xml", len) == 0) {
char *buf = process->target_xml;
const size_t buf_sz = sizeof(process->target_xml);
/* Generate the XML description for this CPU. */
if (!buf[0]) {
GDBRegisterState *r;
pstrcat(buf, buf_sz,
"<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>");
if (cc->gdb_arch_name) {
gchar *arch = cc->gdb_arch_name(cpu);
pstrcat(buf, buf_sz, "<architecture>");
pstrcat(buf, buf_sz, arch);
pstrcat(buf, buf_sz, "</architecture>");
g_free(arch);
}
pstrcat(buf, buf_sz, "<xi:include href=\"");
pstrcat(buf, buf_sz, cc->gdb_core_xml_file);
pstrcat(buf, buf_sz, "\"/>");
for (r = cpu->gdb_regs; r; r = r->next) {
pstrcat(buf, buf_sz, "<xi:include href=\"");
pstrcat(buf, buf_sz, r->xml);
pstrcat(buf, buf_sz, "\"/>");
}
pstrcat(buf, buf_sz, "</target>");
}
return buf;
}
if (cc->gdb_get_dynamic_xml) {
char *xmlname = g_strndup(p, len);
const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname);
g_free(xmlname);
if (xml) {
return 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, GByteArray *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, 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, 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_get_reg_cb get_reg, gdb_set_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