| /* |
| * 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 "config.h" |
| #include "qemu-common.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 "monitor/monitor.h" |
| #include "sysemu/char.h" |
| #include "sysemu/sysemu.h" |
| #include "exec/gdbstub.h" |
| #endif |
| |
| #define MAX_PACKET_LENGTH 4096 |
| |
| #include "cpu.h" |
| #include "qemu/sockets.h" |
| #include "sysemu/kvm.h" |
| #include "exec/semihost.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); |
| } |
| |
| 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 |
| |
| 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_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_csum; |
| uint8_t last_packet[MAX_PACKET_LENGTH + 4]; |
| int last_packet_len; |
| int signal; |
| #ifdef CONFIG_USER_ONLY |
| int fd; |
| int running_state; |
| #else |
| CharDriverState *chr; |
| CharDriverState *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 && errno != EAGAIN) |
| 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 |
| } |
| |
| 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_fe_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_binary(GDBState *s, const char *buf, int len) |
| { |
| int csum, i; |
| uint8_t *p; |
| |
| for(;;) { |
| p = s->last_packet; |
| *(p++) = '$'; |
| memcpy(p, buf, len); |
| p += len; |
| csum = 0; |
| for(i = 0; i < len; i++) { |
| csum += buf[i]; |
| } |
| *(p++) = '#'; |
| *(p++) = tohex((csum >> 4) & 0xf); |
| *(p++) = tohex((csum) & 0xf); |
| |
| s->last_packet_len = p - s->last_packet; |
| put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
| |
| #ifdef CONFIG_USER_ONLY |
| i = get_char(s); |
| if (i < 0) |
| return -1; |
| if (i == '+') |
| break; |
| #else |
| break; |
| #endif |
| } |
| return 0; |
| } |
| |
| /* return -1 if error, 0 if OK */ |
| static int put_packet(GDBState *s, const char *buf) |
| { |
| #ifdef DEBUG_GDB |
| printf("reply='%s'\n", buf); |
| #endif |
| |
| return put_packet_binary(s, buf, strlen(buf)); |
| } |
| |
| /* Encode data using the encoding for 'x' packets. */ |
| static int memtox(char *buf, const char *mem, int len) |
| { |
| char *p = buf; |
| char c; |
| |
| while (len--) { |
| c = *(mem++); |
| switch (c) { |
| case '#': case '$': 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; |
| |
| snprintf(target_xml, sizeof(target_xml), |
| "<?xml version=\"1.0\"?>" |
| "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" |
| "<target>" |
| "<xi:include href=\"%s\"/>", |
| cc->gdb_core_xml_file); |
| |
| 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) { |
| fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n" |
| "Expected %d got %d\n", 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_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); |
| } |
| |
| 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; |
| char buf[MAX_PACKET_LENGTH]; |
| uint8_t mem_buf[MAX_PACKET_LENGTH]; |
| uint8_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), "T%02xthread:%02x;", GDB_SIGNAL_TRAP, |
| cpu_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); |
| } |
| s->signal = 0; |
| gdb_continue(s); |
| return RS_IDLE; |
| case 'C': |
| s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16)); |
| if (s->signal == -1) |
| s->signal = 0; |
| gdb_continue(s); |
| return RS_IDLE; |
| case 'v': |
| if (strncmp(p, "Cont", 4) == 0) { |
| int res_signal, res_thread; |
| |
| p += 4; |
| if (*p == '?') { |
| put_packet(s, "vCont;c;C;s;S"); |
| break; |
| } |
| res = 0; |
| res_signal = 0; |
| res_thread = 0; |
| while (*p) { |
| int action, signal; |
| |
| if (*p++ != ';') { |
| res = 0; |
| break; |
| } |
| action = *p++; |
| signal = 0; |
| if (action == 'C' || action == 'S') { |
| signal = gdb_signal_to_target(strtoul(p, (char **)&p, 16)); |
| if (signal == -1) { |
| signal = 0; |
| } |
| } else if (action != 'c' && action != 's') { |
| res = 0; |
| break; |
| } |
| thread = 0; |
| if (*p == ':') { |
| thread = strtoull(p+1, (char **)&p, 16); |
| } |
| action = tolower(action); |
| if (res == 0 || (res == 'c' && action == 's')) { |
| res = action; |
| res_signal = signal; |
| res_thread = thread; |
| } |
| } |
| if (res) { |
| if (res_thread != -1 && res_thread != 0) { |
| cpu = find_cpu(res_thread); |
| if (cpu == NULL) { |
| put_packet(s, "E22"); |
| break; |
| } |
| s->c_cpu = cpu; |
| } |
| if (res == 's') { |
| cpu_single_step(s->c_cpu, sstep_flags); |
| } |
| s->signal = res_signal; |
| gdb_continue(s); |
| return RS_IDLE; |
| } |
| break; |
| } else { |
| goto unknown_command; |
| } |
| case 'k': |
| /* Kill the target */ |
| fprintf(stderr, "\nQEMU: Terminated via GDBstub\n"); |
| exit(0); |
| case 'D': |
| /* Detach packet */ |
| gdb_breakpoint_remove_all(); |
| gdb_syscall_mode = GDB_SYS_DISABLED; |
| gdb_continue(s); |
| put_packet(s, "OK"); |
| break; |
| case 's': |
| if (*p != '\0') { |
| addr = strtoull(p, (char **)&p, 16); |
| gdb_set_cpu_pc(s, addr); |
| } |
| cpu_single_step(s->c_cpu, sstep_flags); |
| gdb_continue(s); |
| return RS_IDLE; |
| case 'F': |
| { |
| target_ulong ret; |
| target_ulong err; |
| |
| ret = strtoull(p, (char **)&p, 16); |
| if (*p == ',') { |
| p++; |
| err = strtoull(p, (char **)&p, 16); |
| } else { |
| err = 0; |
| } |
| if (*p == ',') |
| p++; |
| type = *p; |
| if (s->current_syscall_cb) { |
| s->current_syscall_cb(s->c_cpu, ret, err); |
| s->current_syscall_cb = NULL; |
| } |
| if (type == 'C') { |
| put_packet(s, "T02"); |
| } else { |
| gdb_continue(s); |
| } |
| } |
| break; |
| case 'g': |
| cpu_synchronize_state(s->g_cpu); |
| len = 0; |
| for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) { |
| reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr); |
| len += reg_size; |
| } |
| memtohex(buf, mem_buf, len); |
| put_packet(s, buf); |
| break; |
| case 'G': |
| cpu_synchronize_state(s->g_cpu); |
| registers = mem_buf; |
| len = strlen(p) / 2; |
| hextomem((uint8_t *)registers, p, len); |
| for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) { |
| reg_size = gdb_write_register(s->g_cpu, registers, addr); |
| len -= reg_size; |
| registers += reg_size; |
| } |
| put_packet(s, "OK"); |
| break; |
| case 'm': |
| addr = strtoull(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoull(p, NULL, 16); |
| if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) { |
| put_packet (s, "E14"); |
| } else { |
| memtohex(buf, mem_buf, len); |
| put_packet(s, buf); |
| } |
| break; |
| case 'M': |
| addr = strtoull(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoull(p, (char **)&p, 16); |
| if (*p == ':') |
| p++; |
| hextomem(mem_buf, p, len); |
| if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, |
| true) != 0) { |
| put_packet(s, "E14"); |
| } else { |
| put_packet(s, "OK"); |
| } |
| break; |
| case 'p': |
| /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable. |
| This works, but can be very slow. Anything new enough to |
| understand XML also knows how to use this properly. */ |
| if (!gdb_has_xml) |
| goto unknown_command; |
| addr = strtoull(p, (char **)&p, 16); |
| reg_size = gdb_read_register(s->g_cpu, mem_buf, addr); |
| if (reg_size) { |
| memtohex(buf, mem_buf, reg_size); |
| put_packet(s, buf); |
| } else { |
| put_packet(s, "E14"); |
| } |
| break; |
| case 'P': |
| if (!gdb_has_xml) |
| goto unknown_command; |
| addr = strtoull(p, (char **)&p, 16); |
| if (*p == '=') |
| p++; |
| reg_size = strlen(p) / 2; |
| hextomem(mem_buf, p, reg_size); |
| gdb_write_register(s->g_cpu, mem_buf, addr); |
| put_packet(s, "OK"); |
| break; |
| case 'Z': |
| case 'z': |
| type = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| addr = strtoull(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoull(p, (char **)&p, 16); |
| if (ch == 'Z') |
| res = gdb_breakpoint_insert(addr, len, type); |
| else |
| res = gdb_breakpoint_remove(addr, len, type); |
| if (res >= 0) |
| put_packet(s, "OK"); |
| else if (res == -ENOSYS) |
| put_packet(s, ""); |
| else |
| put_packet(s, "E22"); |
| break; |
| case 'H': |
| type = *p++; |
| thread = strtoull(p, (char **)&p, 16); |
| if (thread == -1 || thread == 0) { |
| put_packet(s, "OK"); |
| break; |
| } |
| cpu = find_cpu(thread); |
| if (cpu == NULL) { |
| put_packet(s, "E22"); |
| break; |
| } |
| switch (type) { |
| case 'c': |
| s->c_cpu = cpu; |
| put_packet(s, "OK"); |
| break; |
| case 'g': |
| s->g_cpu = cpu; |
| put_packet(s, "OK"); |
| break; |
| default: |
| put_packet(s, "E22"); |
| break; |
| } |
| break; |
| case 'T': |
| thread = strtoull(p, (char **)&p, 16); |
| cpu = find_cpu(thread); |
| |
| if (cpu != NULL) { |
| put_packet(s, "OK"); |
| } else { |
| put_packet(s, "E22"); |
| } |
| break; |
| case 'q': |
| case 'Q': |
| /* parse any 'q' packets here */ |
| if (!strcmp(p,"qemu.sstepbits")) { |
| /* Query Breakpoint bit definitions */ |
| snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", |
| SSTEP_ENABLE, |
| SSTEP_NOIRQ, |
| SSTEP_NOTIMER); |
| put_packet(s, buf); |
| break; |
| } else if (is_query_packet(p, "qemu.sstep", '=')) { |
| /* Display or change the sstep_flags */ |
| p += 10; |
| if (*p != '=') { |
| /* Display current setting */ |
| snprintf(buf, sizeof(buf), "0x%x", sstep_flags); |
| put_packet(s, buf); |
| break; |
| } |
| p++; |
| type = strtoul(p, (char **)&p, 16); |
| sstep_flags = type; |
| put_packet(s, "OK"); |
| break; |
| } else if (strcmp(p,"C") == 0) { |
| /* "Current thread" remains vague in the spec, so always return |
| * the first CPU (gdb returns the first thread). */ |
| put_packet(s, "QC1"); |
| break; |
| } else if (strcmp(p,"fThreadInfo") == 0) { |
| s->query_cpu = first_cpu; |
| goto report_cpuinfo; |
| } else if (strcmp(p,"sThreadInfo") == 0) { |
| report_cpuinfo: |
| if (s->query_cpu) { |
| snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu)); |
| put_packet(s, buf); |
| s->query_cpu = CPU_NEXT(s->query_cpu); |
| } else |
| put_packet(s, "l"); |
| break; |
| } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) { |
| thread = strtoull(p+16, (char **)&p, 16); |
| cpu = find_cpu(thread); |
| if (cpu != NULL) { |
| cpu_synchronize_state(cpu); |
| len = snprintf((char *)mem_buf, sizeof(mem_buf), |
| "CPU#%d [%s]", cpu->cpu_index, |
| cpu->halted ? "halted " : "running"); |
| memtohex(buf, mem_buf, len); |
| put_packet(s, buf); |
| } |
| break; |
| } |
| #ifdef CONFIG_USER_ONLY |
| else if (strcmp(p, "Offsets") == 0) { |
| TaskState *ts = s->c_cpu->opaque; |
| |
| snprintf(buf, sizeof(buf), |
| "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx |
| ";Bss=" TARGET_ABI_FMT_lx, |
| ts->info->code_offset, |
| ts->info->data_offset, |
| ts->info->data_offset); |
| put_packet(s, buf); |
| break; |
| } |
| #else /* !CONFIG_USER_ONLY */ |
| else if (strncmp(p, "Rcmd,", 5) == 0) { |
| int len = strlen(p + 5); |
| |
| if ((len % 2) != 0) { |
| put_packet(s, "E01"); |
| break; |
| } |
| hextomem(mem_buf, p + 5, len); |
| len = len / 2; |
| mem_buf[len++] = 0; |
| qemu_chr_be_write(s->mon_chr, mem_buf, len); |
| put_packet(s, "OK"); |
| break; |
| } |
| #endif /* !CONFIG_USER_ONLY */ |
| if (is_query_packet(p, "Supported", ':')) { |
| snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH); |
| cc = CPU_GET_CLASS(first_cpu); |
| if (cc->gdb_core_xml_file != NULL) { |
| pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); |
| } |
| put_packet(s, buf); |
| break; |
| } |
| if (strncmp(p, "Xfer:features:read:", 19) == 0) { |
| const char *xml; |
| target_ulong total_len; |
| |
| cc = CPU_GET_CLASS(first_cpu); |
| if (cc->gdb_core_xml_file == NULL) { |
| goto unknown_command; |
| } |
| |
| gdb_has_xml = true; |
| p += 19; |
| xml = get_feature_xml(p, &p, cc); |
| if (!xml) { |
| snprintf(buf, sizeof(buf), "E00"); |
| put_packet(s, buf); |
| break; |
| } |
| |
| if (*p == ':') |
| p++; |
| addr = strtoul(p, (char **)&p, 16); |
| if (*p == ',') |
| p++; |
| len = strtoul(p, (char **)&p, 16); |
| |
| total_len = strlen(xml); |
| if (addr > total_len) { |
| snprintf(buf, sizeof(buf), "E00"); |
| put_packet(s, buf); |
| break; |
| } |
| if (len > (MAX_PACKET_LENGTH - 5) / 2) |
| len = (MAX_PACKET_LENGTH - 5) / 2; |
| if (len < total_len - addr) { |
| buf[0] = 'm'; |
| len = memtox(buf + 1, xml + addr, len); |
| } else { |
| buf[0] = 'l'; |
| len = memtox(buf + 1, xml + addr, total_len - addr); |
| } |
| put_packet_binary(s, buf, len + 1); |
| break; |
| } |
| if (is_query_packet(p, "Attached", ':')) { |
| put_packet(s, GDB_ATTACHED); |
| break; |
| } |
| /* Unrecognised 'q' command. */ |
| goto unknown_command; |
| |
| default: |
| unknown_command: |
| /* put empty packet */ |
| buf[0] = '\0'; |
| put_packet(s, buf); |
| break; |
| } |
| return RS_IDLE; |
| } |
| |
| void gdb_set_stop_cpu(CPUState *cpu) |
| { |
| gdbserver_state->c_cpu = cpu; |
| gdbserver_state->g_cpu = cpu; |
| } |
| |
| #ifndef CONFIG_USER_ONLY |
| static void gdb_vm_state_change(void *opaque, int running, RunState state) |
| { |
| GDBState *s = gdbserver_state; |
| CPUState *cpu = s->c_cpu; |
| char buf[256]; |
| const char *type; |
| int ret; |
| |
| if (running || s->state == RS_INACTIVE) { |
| return; |
| } |
| /* Is there a GDB syscall waiting to be sent? */ |
| if (s->current_syscall_cb) { |
| put_packet(s, s->syscall_buf); |
| return; |
| } |
| switch (state) { |
| case RUN_STATE_DEBUG: |
| if (cpu->watchpoint_hit) { |
| switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) { |
| case BP_MEM_READ: |
| type = "r"; |
| break; |
| case BP_MEM_ACCESS: |
| type = "a"; |
| break; |
| default: |
| type = ""; |
| break; |
| } |
| snprintf(buf, sizeof(buf), |
| "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";", |
| GDB_SIGNAL_TRAP, cpu_index(cpu), type, |
| (target_ulong)cpu->watchpoint_hit->vaddr); |
| cpu->watchpoint_hit = NULL; |
| goto send_packet; |
| } |
| tb_flush(cpu); |
| ret = GDB_SIGNAL_TRAP; |
| break; |
| case RUN_STATE_PAUSED: |
| ret = GDB_SIGNAL_INT; |
| break; |
| case RUN_STATE_SHUTDOWN: |
| ret = GDB_SIGNAL_QUIT; |
| break; |
| case RUN_STATE_IO_ERROR: |
| ret = GDB_SIGNAL_IO; |
| break; |
| case RUN_STATE_WATCHDOG: |
| ret = GDB_SIGNAL_ALRM; |
| break; |
| case RUN_STATE_INTERNAL_ERROR: |
| ret = GDB_SIGNAL_ABRT; |
| break; |
| case RUN_STATE_SAVE_VM: |
| case RUN_STATE_RESTORE_VM: |
| return; |
| case RUN_STATE_FINISH_MIGRATE: |
| ret = GDB_SIGNAL_XCPU; |
| break; |
| default: |
| ret = GDB_SIGNAL_UNKNOWN; |
| break; |
| } |
| gdb_set_stop_cpu(cpu); |
| snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu)); |
| |
| send_packet: |
| put_packet(s, buf); |
| |
| /* disable single step if it was enabled */ |
| cpu_single_step(cpu, 0); |
| } |
| #endif |
| |
| /* Send a gdb syscall request. |
| This accepts limited printf-style format specifiers, specifically: |
| %x - target_ulong argument printed in hex. |
| %lx - 64-bit argument printed in hex. |
| %s - string pointer (target_ulong) and length (int) pair. */ |
| void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) |
| { |
| va_list va; |
| char *p; |
| char *p_end; |
| target_ulong addr; |
| uint64_t i64; |
| GDBState *s; |
| |
| s = gdbserver_state; |
| if (!s) |
| return; |
| s->current_syscall_cb = cb; |
| #ifndef CONFIG_USER_ONLY |
| vm_stop(RUN_STATE_DEBUG); |
| #endif |
| va_start(va, fmt); |
| p = s->syscall_buf; |
| p_end = &s->syscall_buf[sizeof(s->syscall_buf)]; |
| *(p++) = 'F'; |
| while (*fmt) { |
| if (*fmt == '%') { |
| fmt++; |
| switch (*fmt++) { |
| case 'x': |
| addr = va_arg(va, target_ulong); |
| p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); |
| break; |
| case 'l': |
| if (*(fmt++) != 'x') |
| goto bad_format; |
| i64 = va_arg(va, uint64_t); |
| p += snprintf(p, p_end - p, "%" PRIx64, i64); |
| break; |
| case 's': |
| addr = va_arg(va, target_ulong); |
| p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", |
| addr, va_arg(va, int)); |
| break; |
| default: |
| bad_format: |
| fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n", |
| fmt - 1); |
| break; |
| } |
| } else { |
| *(p++) = *(fmt++); |
| } |
| } |
| *p = 0; |
| va_end(va); |
| #ifdef CONFIG_USER_ONLY |
| put_packet(s, s->syscall_buf); |
| gdb_handlesig(s->c_cpu, 0); |
| #else |
| /* In this case wait to send the syscall packet until notification that |
| the CPU has stopped. This must be done because if the packet is sent |
| now the reply from the syscall request could be received while the CPU |
| is still in the running state, which can cause packets to be dropped |
| and state transition 'T' packets to be sent while the syscall is still |
| being processed. */ |
| qemu_cpu_kick(s->c_cpu); |
| #endif |
| } |
| |
| static void gdb_read_byte(GDBState *s, int ch) |
| { |
| int i, csum; |
| uint8_t reply; |
| |
| #ifndef CONFIG_USER_ONLY |
| if (s->last_packet_len) { |
| /* Waiting for a response to the last packet. If we see the start |
| of a new command then abandon the previous response. */ |
| if (ch == '-') { |
| #ifdef DEBUG_GDB |
| printf("Got NACK, retransmitting\n"); |
| #endif |
| put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
| } |
| #ifdef DEBUG_GDB |
| else if (ch == '+') |
| printf("Got ACK\n"); |
| else |
| printf("Got '%c' when expecting ACK/NACK\n", ch); |
| #endif |
| if (ch == '+' || ch == '$') |
| s->last_packet_len = 0; |
| if (ch != '$') |
| return; |
| } |
| if (runstate_is_running()) { |
| /* when the CPU is running, we cannot do anything except stop |
| it when receiving a char */ |
| vm_stop(RUN_STATE_PAUSED); |
| } else |
| #endif |
| { |
| switch(s->state) { |
| case RS_IDLE: |
| if (ch == '$') { |
| s->line_buf_index = 0; |
| s->state = RS_GETLINE; |
| } |
| break; |
| case RS_GETLINE: |
| if (ch == '#') { |
| s->state = RS_CHKSUM1; |
| } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
| s->state = RS_IDLE; |
| } else { |
| s->line_buf[s->line_buf_index++] = ch; |
| } |
| break; |
| 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 = '-'; |
| put_buffer(s, &reply, 1); |
| s->state = RS_IDLE; |
| } else { |
| reply = '+'; |
| put_buffer(s, &reply, 1); |
| s->state = gdb_handle_packet(s, s->line_buf); |
| } |
| break; |
| default: |
| abort(); |
| } |
| } |
| } |
| |
| /* Tell the remote gdb that the process has exited. */ |
| void gdb_exit(CPUArchState *env, int code) |
| { |
| GDBState *s; |
| char buf[4]; |
| |
| s = gdbserver_state; |
| if (!s) { |
| return; |
| } |
| #ifdef CONFIG_USER_ONLY |
| if (gdbserver_fd < 0 || s->fd < 0) { |
| return; |
| } |
| #else |
| if (!s->chr) { |
| return; |
| } |
| #endif |
| |
| snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); |
| put_packet(s, buf); |
| |
| #ifndef CONFIG_USER_ONLY |
| qemu_chr_delete(s->chr); |
| #endif |
| } |
| |
| #ifdef CONFIG_USER_ONLY |
| int |
| gdb_queuesig (void) |
| { |
| GDBState *s; |
| |
| s = gdbserver_state; |
| |
| if (gdbserver_fd < 0 || s->fd < 0) |
| return 0; |
| else |
| return 1; |
| } |
| |
| int |
| gdb_handlesig(CPUState *cpu, int sig) |
| { |
| GDBState *s; |
| char buf[256]; |
| int n; |
| |
| s = gdbserver_state; |
| if (gdbserver_fd < 0 || s->fd < 0) { |
| return sig; |
| } |
| |
| /* disable single step if it was enabled */ |
| cpu_single_step(cpu, 0); |
| tb_flush(cpu); |
| |
| if (sig != 0) { |
| snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); |
| put_packet(s, buf); |
| } |
| /* put_packet() might have detected that the peer terminated the |
| connection. */ |
| if (s->fd < 0) { |
| return sig; |
| } |
| |
| sig = 0; |
| s->state = RS_IDLE; |
| s->running_state = 0; |
| while (s->running_state == 0) { |
| n = read(s->fd, buf, 256); |
| if (n > 0) { |
| int i; |
| |
| for (i = 0; i < n; i++) { |
| gdb_read_byte(s, buf[i]); |
| } |
| } else if (n == 0 || errno != EAGAIN) { |
| /* XXX: Connection closed. Should probably wait for another |
| connection before continuing. */ |
| return sig; |
| } |
| } |
| sig = s->signal; |
| s->signal = 0; |
| return sig; |
| } |
| |
| /* Tell the remote gdb that the process has exited due to SIG. */ |
| void gdb_signalled(CPUArchState *env, int sig) |
| { |
| GDBState *s; |
| char buf[4]; |
| |
| s = gdbserver_state; |
| if (gdbserver_fd < 0 || s->fd < 0) { |
| return; |
| } |
| |
| snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); |
| put_packet(s, buf); |
| } |
| |
| static void gdb_accept(void) |
| { |
| GDBState *s; |
| struct sockaddr_in sockaddr; |
| socklen_t len; |
| int 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) { |
| #ifndef _WIN32 |
| fcntl(fd, F_SETFD, FD_CLOEXEC); |
| #endif |
| break; |
| } |
| } |
| |
| /* set short latency */ |
| socket_set_nodelay(fd); |
| |
| s = g_malloc0(sizeof(GDBState)); |
| s->c_cpu = first_cpu; |
| s->g_cpu = first_cpu; |
| s->fd = fd; |
| gdb_has_xml = false; |
| |
| gdbserver_state = s; |
| |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| } |
| |
| static int gdbserver_open(int port) |
| { |
| struct sockaddr_in sockaddr; |
| int fd, ret; |
| |
| fd = socket(PF_INET, SOCK_STREAM, 0); |
| if (fd < 0) { |
| perror("socket"); |
| return -1; |
| } |
| #ifndef _WIN32 |
| fcntl(fd, F_SETFD, FD_CLOEXEC); |
| #endif |
| |
| socket_set_fast_reuse(fd); |
| |
| 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"); |
| close(fd); |
| return -1; |
| } |
| ret = listen(fd, 0); |
| if (ret < 0) { |
| perror("listen"); |
| close(fd); |
| return -1; |
| } |
| return fd; |
| } |
| |
| int gdbserver_start(int port) |
| { |
| gdbserver_fd = gdbserver_open(port); |
| if (gdbserver_fd < 0) |
| return -1; |
| /* accept connections */ |
| gdb_accept(); |
| return 0; |
| } |
| |
| /* Disable gdb stub for child processes. */ |
| void gdbserver_fork(CPUState *cpu) |
| { |
| GDBState *s = gdbserver_state; |
| |
| if (gdbserver_fd < 0 || s->fd < 0) { |
| return; |
| } |
| close(s->fd); |
| s->fd = -1; |
| cpu_breakpoint_remove_all(cpu, BP_GDB); |
| cpu_watchpoint_remove_all(cpu, BP_GDB); |
| } |
| #else |
| static int gdb_chr_can_receive(void *opaque) |
| { |
| /* We can handle an arbitrarily large amount of data. |
| Pick the maximum packet size, which is as good as anything. */ |
| return MAX_PACKET_LENGTH; |
| } |
| |
| static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) |
| { |
| int i; |
| |
| for (i = 0; i < size; i++) { |
| gdb_read_byte(gdbserver_state, buf[i]); |
| } |
| } |
| |
| static void gdb_chr_event(void *opaque, int event) |
| { |
| switch (event) { |
| case CHR_EVENT_OPENED: |
| vm_stop(RUN_STATE_PAUSED); |
| gdb_has_xml = false; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void gdb_monitor_output(GDBState *s, const char *msg, int len) |
| { |
| char buf[MAX_PACKET_LENGTH]; |
| |
| buf[0] = 'O'; |
| if (len > (MAX_PACKET_LENGTH/2) - 1) |
| len = (MAX_PACKET_LENGTH/2) - 1; |
| memtohex(buf + 1, (uint8_t *)msg, len); |
| put_packet(s, buf); |
| } |
| |
| static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len) |
| { |
| const char *p = (const char *)buf; |
| int max_sz; |
| |
| max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2; |
| for (;;) { |
| if (len <= max_sz) { |
| gdb_monitor_output(gdbserver_state, p, len); |
| break; |
| } |
| gdb_monitor_output(gdbserver_state, p, max_sz); |
| p += max_sz; |
| len -= max_sz; |
| } |
| return len; |
| } |
| |
| #ifndef _WIN32 |
| static void gdb_sigterm_handler(int signal) |
| { |
| if (runstate_is_running()) { |
| vm_stop(RUN_STATE_PAUSED); |
| } |
| } |
| #endif |
| |
| int gdbserver_start(const char *device) |
| { |
| GDBState *s; |
| char gdbstub_device_name[128]; |
| CharDriverState *chr = NULL; |
| CharDriverState *mon_chr; |
| |
| if (!device) |
| return -1; |
| if (strcmp(device, "none") != 0) { |
| if (strstart(device, "tcp:", NULL)) { |
| /* enforce required TCP attributes */ |
| snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), |
| "%s,nowait,nodelay,server", device); |
| device = gdbstub_device_name; |
| } |
| #ifndef _WIN32 |
| else if (strcmp(device, "stdio") == 0) { |
| struct sigaction act; |
| |
| memset(&act, 0, sizeof(act)); |
| act.sa_handler = gdb_sigterm_handler; |
| sigaction(SIGINT, &act, NULL); |
| } |
| #endif |
| chr = qemu_chr_new("gdb", device, NULL); |
| if (!chr) |
| return -1; |
| |
| qemu_chr_fe_claim_no_fail(chr); |
| qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive, |
| gdb_chr_event, NULL); |
| } |
| |
| s = gdbserver_state; |
| if (!s) { |
| s = g_malloc0(sizeof(GDBState)); |
| gdbserver_state = s; |
| |
| qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL); |
| |
| /* Initialize a monitor terminal for gdb */ |
| mon_chr = qemu_chr_alloc(); |
| mon_chr->chr_write = gdb_monitor_write; |
| monitor_init(mon_chr, 0); |
| } else { |
| if (s->chr) |
| qemu_chr_delete(s->chr); |
| mon_chr = s->mon_chr; |
| memset(s, 0, sizeof(GDBState)); |
| } |
| s->c_cpu = first_cpu; |
| s->g_cpu = first_cpu; |
| s->chr = chr; |
| s->state = chr ? RS_IDLE : RS_INACTIVE; |
| s->mon_chr = mon_chr; |
| s->current_syscall_cb = NULL; |
| |
| return 0; |
| } |
| #endif |
