gdbstub: move str_buf to GDBState and use GString
Rather than having a static buffer replace str_buf with a GString which we know can grow on demand. Convert the internal functions to take a GString instead of a char * and length. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Damien Hedde <damien.hedde@greensocs.com> Tested-by: Damien Hedde <damien.hedde@greensocs.com> Message-Id: <20200316172155.971-9-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée
parent
a346af3e35
commit
308f9e88b2
197
gdbstub.c
197
gdbstub.c
@ -366,6 +366,7 @@ typedef struct GDBState {
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int process_num;
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char syscall_buf[256];
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gdb_syscall_complete_cb current_syscall_cb;
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GString *str_buf;
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} GDBState;
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/* By default use no IRQs and no timers while single stepping so as to
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@ -380,6 +381,7 @@ static void init_gdbserver_state(void)
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g_assert(!gdbserver_state.init);
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memset(&gdbserver_state, 0, sizeof(GDBState));
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gdbserver_state.init = true;
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gdbserver_state.str_buf = g_string_new(NULL);
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}
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#ifndef CONFIG_USER_ONLY
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@ -563,17 +565,15 @@ static inline int tohex(int v)
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}
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/* writes 2*len+1 bytes in buf */
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static void memtohex(char *buf, const uint8_t *mem, int len)
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static void memtohex(GString *buf, const uint8_t *mem, int len)
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{
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int i, c;
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char *q;
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q = buf;
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for(i = 0; i < len; i++) {
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c = mem[i];
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*q++ = tohex(c >> 4);
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*q++ = tohex(c & 0xf);
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g_string_append_c(buf, tohex(c >> 4));
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g_string_append_c(buf, tohex(c & 0xf));
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}
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*q = '\0';
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g_string_append_c(buf, '\0');
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}
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static void hextomem(uint8_t *mem, const char *buf, int len)
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@ -667,25 +667,28 @@ static int put_packet(const char *buf)
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return put_packet_binary(buf, strlen(buf), false);
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}
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/* Encode data using the encoding for 'x' packets. */
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static int memtox(char *buf, const char *mem, int len)
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static void put_strbuf(void)
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{
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put_packet(gdbserver_state.str_buf->str);
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}
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/* Encode data using the encoding for 'x' packets. */
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static void memtox(GString *buf, const char *mem, int len)
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{
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char *p = buf;
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char c;
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while (len--) {
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c = *(mem++);
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switch (c) {
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case '#': case '$': case '*': case '}':
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*(p++) = '}';
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*(p++) = c ^ 0x20;
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g_string_append_c(buf, '}');
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g_string_append_c(buf, c ^ 0x20);
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break;
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default:
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*(p++) = c;
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g_string_append_c(buf, c);
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break;
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}
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}
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return p - buf;
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}
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static uint32_t gdb_get_cpu_pid(CPUState *cpu)
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@ -1109,16 +1112,14 @@ static void gdb_set_cpu_pc(target_ulong pc)
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cpu_set_pc(cpu, pc);
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}
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static char *gdb_fmt_thread_id(CPUState *cpu, char *buf, size_t buf_size)
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static void gdb_append_thread_id(CPUState *cpu, GString *buf)
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{
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if (gdbserver_state.multiprocess) {
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snprintf(buf, buf_size, "p%02x.%02x",
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gdb_get_cpu_pid(cpu), cpu_gdb_index(cpu));
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g_string_append_printf(buf, "p%02x.%02x",
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gdb_get_cpu_pid(cpu), cpu_gdb_index(cpu));
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} else {
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snprintf(buf, buf_size, "%02x", cpu_gdb_index(cpu));
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g_string_append_printf(buf, "%02x", cpu_gdb_index(cpu));
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}
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return buf;
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}
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typedef enum GDBThreadIdKind {
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@ -1412,7 +1413,6 @@ typedef struct GdbCmdContext {
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GdbCmdVariant *params;
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int num_params;
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uint8_t mem_buf[MAX_PACKET_LENGTH];
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char str_buf[MAX_PACKET_LENGTH + 1];
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} GdbCmdContext;
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typedef void (*GdbCmdHandler)(GdbCmdContext *gdb_ctx, void *user_ctx);
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@ -1502,6 +1502,8 @@ static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd)
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return;
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}
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g_string_set_size(gdbserver_state.str_buf, 0);
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/* In case there was an error during the command parsing we must
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* send a NULL packet to indicate the command is not supported */
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if (process_string_cmd(NULL, data, cmd, 1)) {
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@ -1740,8 +1742,8 @@ static void handle_get_reg(GdbCmdContext *gdb_ctx, void *user_ctx)
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return;
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}
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memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, reg_size);
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put_packet(gdb_ctx->str_buf);
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memtohex(gdbserver_state.str_buf, gdb_ctx->mem_buf, reg_size);
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put_strbuf();
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}
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static void handle_write_mem(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -1789,8 +1791,8 @@ static void handle_read_mem(GdbCmdContext *gdb_ctx, void *user_ctx)
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return;
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}
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memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, gdb_ctx->params[1].val_ull);
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put_packet(gdb_ctx->str_buf);
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memtohex(gdbserver_state.str_buf, gdb_ctx->mem_buf, gdb_ctx->params[1].val_ull);
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put_strbuf();
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}
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static void handle_write_all_regs(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -1827,8 +1829,8 @@ static void handle_read_all_regs(GdbCmdContext *gdb_ctx, void *user_ctx)
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addr);
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}
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memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, len);
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put_packet(gdb_ctx->str_buf);
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memtohex(gdbserver_state.str_buf, gdb_ctx->mem_buf, len);
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put_strbuf();
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}
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static void handle_file_io(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -1889,9 +1891,8 @@ static void handle_v_attach(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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GDBProcess *process;
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CPUState *cpu;
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char thread_id[16];
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pstrcpy(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "E22");
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g_string_assign(gdbserver_state.str_buf, "E22");
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if (!gdb_ctx->num_params) {
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goto cleanup;
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}
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@ -1910,11 +1911,11 @@ static void handle_v_attach(GdbCmdContext *gdb_ctx, void *user_ctx)
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gdbserver_state.g_cpu = cpu;
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gdbserver_state.c_cpu = cpu;
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gdb_fmt_thread_id(cpu, thread_id, sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "T%02xthread:%s;",
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GDB_SIGNAL_TRAP, thread_id);
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g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
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gdb_append_thread_id(cpu, gdbserver_state.str_buf);
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g_string_append_c(gdbserver_state.str_buf, ';');
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cleanup:
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put_packet(gdb_ctx->str_buf);
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put_strbuf();
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}
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static void handle_v_kill(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -1966,10 +1967,9 @@ static void handle_v_commands(GdbCmdContext *gdb_ctx, void *user_ctx)
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static void handle_query_qemu_sstepbits(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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"ENABLE=%x,NOIRQ=%x,NOTIMER=%x", SSTEP_ENABLE,
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SSTEP_NOIRQ, SSTEP_NOTIMER);
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put_packet(gdb_ctx->str_buf);
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g_string_printf(gdbserver_state.str_buf, "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
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SSTEP_ENABLE, SSTEP_NOIRQ, SSTEP_NOTIMER);
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put_strbuf();
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}
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static void handle_set_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -1984,15 +1984,14 @@ static void handle_set_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx)
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static void handle_query_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "0x%x", sstep_flags);
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put_packet(gdb_ctx->str_buf);
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g_string_printf(gdbserver_state.str_buf, "0x%x", sstep_flags);
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put_strbuf();
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}
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static void handle_query_curr_tid(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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CPUState *cpu;
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GDBProcess *process;
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char thread_id[16];
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/*
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* "Current thread" remains vague in the spec, so always return
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@ -2001,24 +2000,21 @@ static void handle_query_curr_tid(GdbCmdContext *gdb_ctx, void *user_ctx)
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*/
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process = gdb_get_cpu_process(gdbserver_state.g_cpu);
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cpu = get_first_cpu_in_process(process);
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gdb_fmt_thread_id(cpu, thread_id, sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "QC%s", thread_id);
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put_packet(gdb_ctx->str_buf);
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g_string_assign(gdbserver_state.str_buf, "QC");
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gdb_append_thread_id(cpu, gdbserver_state.str_buf);
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put_strbuf();
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}
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static void handle_query_threads(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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char thread_id[16];
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if (!gdbserver_state.query_cpu) {
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put_packet("l");
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return;
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}
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gdb_fmt_thread_id(gdbserver_state.query_cpu, thread_id,
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sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "m%s", thread_id);
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put_packet(gdb_ctx->str_buf);
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g_string_assign(gdbserver_state.str_buf, "m");
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gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf);
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put_strbuf();
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gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu);
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}
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@ -2030,8 +2026,8 @@ static void handle_query_first_threads(GdbCmdContext *gdb_ctx, void *user_ctx)
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static void handle_query_thread_extra(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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g_autoptr(GString) rs = g_string_new(NULL);
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CPUState *cpu;
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int len;
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if (!gdb_ctx->num_params ||
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gdb_ctx->params[0].thread_id.kind == GDB_READ_THREAD_ERR) {
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@ -2051,20 +2047,17 @@ static void handle_query_thread_extra(GdbCmdContext *gdb_ctx, void *user_ctx)
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/* Print the CPU model and name in multiprocess mode */
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ObjectClass *oc = object_get_class(OBJECT(cpu));
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const char *cpu_model = object_class_get_name(oc);
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char *cpu_name = object_get_canonical_path_component(OBJECT(cpu));
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len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2,
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"%s %s [%s]", cpu_model, cpu_name,
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cpu->halted ? "halted " : "running");
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g_free(cpu_name);
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g_autofree char *cpu_name;
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cpu_name = object_get_canonical_path_component(OBJECT(cpu));
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g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name,
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cpu->halted ? "halted " : "running");
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} else {
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/* memtohex() doubles the required space */
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len = snprintf((char *)gdb_ctx->mem_buf, sizeof(gdb_ctx->str_buf) / 2,
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"CPU#%d [%s]", cpu->cpu_index,
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g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index,
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cpu->halted ? "halted " : "running");
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}
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trace_gdbstub_op_extra_info((char *)gdb_ctx->mem_buf);
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memtohex(gdb_ctx->str_buf, gdb_ctx->mem_buf, len);
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put_packet(gdb_ctx->str_buf);
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trace_gdbstub_op_extra_info(rs->str);
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memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len);
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put_strbuf();
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}
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#ifdef CONFIG_USER_ONLY
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@ -2073,13 +2066,14 @@ static void handle_query_offsets(GdbCmdContext *gdb_ctx, void *user_ctx)
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TaskState *ts;
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ts = gdbserver_state.c_cpu->opaque;
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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"Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx
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";Bss=" TARGET_ABI_FMT_lx,
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ts->info->code_offset,
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ts->info->data_offset,
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ts->info->data_offset);
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put_packet(gdb_ctx->str_buf);
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g_string_printf(gdbserver_state.str_buf,
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"Text=" TARGET_ABI_FMT_lx
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";Data=" TARGET_ABI_FMT_lx
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";Bss=" TARGET_ABI_FMT_lx,
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ts->info->code_offset,
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ts->info->data_offset,
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ts->info->data_offset);
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put_strbuf();
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}
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#else
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static void handle_query_rcmd(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -2110,12 +2104,10 @@ static void handle_query_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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CPUClass *cc;
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "PacketSize=%x",
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MAX_PACKET_LENGTH);
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g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH);
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cc = CPU_GET_CLASS(first_cpu);
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if (cc->gdb_core_xml_file) {
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pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf),
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";qXfer:features:read+");
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g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+");
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}
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if (gdb_ctx->num_params &&
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@ -2123,8 +2115,8 @@ static void handle_query_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
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gdbserver_state.multiprocess = true;
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}
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pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), ";multiprocess+");
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put_packet(gdb_ctx->str_buf);
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g_string_append(gdbserver_state.str_buf, ";multiprocess+");
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put_strbuf();
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}
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static void handle_query_xfer_features(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -2168,14 +2160,15 @@ static void handle_query_xfer_features(GdbCmdContext *gdb_ctx, void *user_ctx)
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}
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if (len < total_len - addr) {
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gdb_ctx->str_buf[0] = 'm';
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len = memtox(gdb_ctx->str_buf + 1, xml + addr, len);
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g_string_assign(gdbserver_state.str_buf, "m");
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memtox(gdbserver_state.str_buf, xml + addr, len);
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} else {
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gdb_ctx->str_buf[0] = 'l';
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len = memtox(gdb_ctx->str_buf + 1, xml + addr, total_len - addr);
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g_string_assign(gdbserver_state.str_buf, "l");
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memtox(gdbserver_state.str_buf, xml + addr, total_len - addr);
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}
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put_packet_binary(gdb_ctx->str_buf, len + 1, true);
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put_packet_binary(gdbserver_state.str_buf->str,
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gdbserver_state.str_buf->len, true);
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}
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static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -2185,19 +2178,19 @@ static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx)
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static void handle_query_qemu_supported(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "sstepbits;sstep");
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g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep");
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#ifndef CONFIG_USER_ONLY
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pstrcat(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), ";PhyMemMode");
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g_string_append(gdbserver_state.str_buf, ";PhyMemMode");
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#endif
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put_packet(gdb_ctx->str_buf);
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put_strbuf();
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}
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#ifndef CONFIG_USER_ONLY
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static void handle_query_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx,
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void *user_ctx)
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{
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "%d", phy_memory_mode);
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put_packet(gdb_ctx->str_buf);
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g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode);
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put_strbuf();
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}
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static void handle_set_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx, void *user_ctx)
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@ -2362,13 +2355,10 @@ static void handle_gen_set(GdbCmdContext *gdb_ctx, void *user_ctx)
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static void handle_target_halt(GdbCmdContext *gdb_ctx, void *user_ctx)
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{
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char thread_id[16];
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gdb_fmt_thread_id(gdbserver_state.c_cpu, thread_id,
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sizeof(thread_id));
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snprintf(gdb_ctx->str_buf, sizeof(gdb_ctx->str_buf), "T%02xthread:%s;",
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GDB_SIGNAL_TRAP, thread_id);
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put_packet(gdb_ctx->str_buf);
|
||||
g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
|
||||
gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf);
|
||||
g_string_append_c(gdbserver_state.str_buf, ';');
|
||||
put_strbuf();
|
||||
/*
|
||||
* Remove all the breakpoints when this query is issued,
|
||||
* because gdb is doing an initial connect and the state
|
||||
@ -2631,8 +2621,8 @@ void gdb_set_stop_cpu(CPUState *cpu)
|
||||
static void gdb_vm_state_change(void *opaque, int running, RunState state)
|
||||
{
|
||||
CPUState *cpu = gdbserver_state.c_cpu;
|
||||
char buf[256];
|
||||
char thread_id[16];
|
||||
g_autoptr(GString) buf = g_string_new(NULL);
|
||||
g_autoptr(GString) tid = g_string_new(NULL);
|
||||
const char *type;
|
||||
int ret;
|
||||
|
||||
@ -2650,7 +2640,7 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
|
||||
return;
|
||||
}
|
||||
|
||||
gdb_fmt_thread_id(cpu, thread_id, sizeof(thread_id));
|
||||
gdb_append_thread_id(cpu, tid);
|
||||
|
||||
switch (state) {
|
||||
case RUN_STATE_DEBUG:
|
||||
@ -2668,10 +2658,9 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
|
||||
}
|
||||
trace_gdbstub_hit_watchpoint(type, cpu_gdb_index(cpu),
|
||||
(target_ulong)cpu->watchpoint_hit->vaddr);
|
||||
snprintf(buf, sizeof(buf),
|
||||
"T%02xthread:%s;%swatch:" TARGET_FMT_lx ";",
|
||||
GDB_SIGNAL_TRAP, thread_id, type,
|
||||
(target_ulong)cpu->watchpoint_hit->vaddr);
|
||||
g_string_printf(buf, "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";",
|
||||
GDB_SIGNAL_TRAP, tid->str, type,
|
||||
(target_ulong)cpu->watchpoint_hit->vaddr);
|
||||
cpu->watchpoint_hit = NULL;
|
||||
goto send_packet;
|
||||
} else {
|
||||
@ -2712,10 +2701,10 @@ static void gdb_vm_state_change(void *opaque, int running, RunState state)
|
||||
break;
|
||||
}
|
||||
gdb_set_stop_cpu(cpu);
|
||||
snprintf(buf, sizeof(buf), "T%02xthread:%s;", ret, thread_id);
|
||||
g_string_printf(buf, "T%02xthread:%s;", ret, tid->str);
|
||||
|
||||
send_packet:
|
||||
put_packet(buf);
|
||||
put_packet(buf->str);
|
||||
|
||||
/* disable single step if it was enabled */
|
||||
cpu_single_step(cpu, 0);
|
||||
@ -3196,13 +3185,9 @@ static void gdb_chr_event(void *opaque, QEMUChrEvent event)
|
||||
|
||||
static void gdb_monitor_output(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(buf);
|
||||
g_autoptr(GString) buf = g_string_new("O");
|
||||
memtohex(buf, (uint8_t *)msg, len);
|
||||
put_packet(buf->str);
|
||||
}
|
||||
|
||||
static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user