Merge tag 'pull-hex-20230518-1' of https://github.com/quic/qemu into staging

Hexagon update

# -----BEGIN PGP SIGNATURE-----
#
# iQEzBAABCgAdFiEENjXHiM5iuR/UxZq0ewJE+xLeRCIFAmRmgQgACgkQewJE+xLe
# RCJLtAf8C/0kQRa4mjnbsztXuFyca53UxAv3BSBEDla4ZcMfFBoVJsGB3OP7IPXd
# KBQpkLyJAVye9idex5xqdp9nIfoGKDTsc6YtCfGujZ17cDpzLRDpHdUTex8PcZYK
# wpfM3hoVJsYRBMsojZ4OaxatjFQ+FWzrIH6FcgH086Q8TH4w9dZLNEJzHC4lOj0s
# 7qOuw2tgm+vOVlzsk/fv6/YD/BTeZTON3jgTPvAnvdRLb/482UpM9JkJ8E4rbte3
# Ss5PUK8QTQHU0yamspGy/PfsYxiptM+jIWGd836fAGzwF12Ug27mSc1enndRtQVW
# pQTdnOnWuuRzOwEpd7x3xh9upACm4g==
# =1CyJ
# -----END PGP SIGNATURE-----
# gpg: Signature made Thu 18 May 2023 12:48:24 PM PDT
# gpg:                using RSA key 3635C788CE62B91FD4C59AB47B0244FB12DE4422
# gpg: Good signature from "Taylor Simpson (Rock on) <tsimpson@quicinc.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 3635 C788 CE62 B91F D4C5  9AB4 7B02 44FB 12DE 4422

* tag 'pull-hex-20230518-1' of https://github.com/quic/qemu: (44 commits)
  Hexagon (linux-user/hexagon): handle breakpoints
  Hexagon (gdbstub): add HVX support
  Hexagon (gdbstub): fix p3:0 read and write via stub
  Hexagon: add core gdbstub xml data for LLDB
  gdbstub: add test for untimely stop-reply packets
  gdbstub: only send stop-reply packets when allowed to
  Remove test_vshuff from hvx_misc tests
  Hexagon (decode): look for pkts with multiple insns at the same slot
  Hexagon (iclass): update J4_hintjumpr slot constraints
  Hexagon: append eflags to unknown cpu model string
  Hexagon: list available CPUs with `-cpu help`
  Hexagon (target/hexagon/*.py): raise exception on reg parsing error
  target/hexagon: fix = vs. == mishap
  Hexagon (target/hexagon) Additional instructions handled by idef-parser
  Hexagon (target/hexagon) Move items to DisasContext
  Hexagon (target/hexagon) Move pkt_has_store_s1 to DisasContext
  Hexagon (target/hexagon) Move pred_written to DisasContext
  Hexagon (target/hexagon) Move new_pred_value to DisasContext
  Hexagon (target/hexagon) Move new_value to DisasContext
  Hexagon (target/hexagon) Make special new_value for USR
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

4 files changed, 60 insertions, 19 deletions

diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index 0760d78..be18568 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -777,6 +777,10 @@ typedef void (*GdbCmdHandler)(GArray *params, void *user_ctx);
 /*
  * cmd_startswith -> cmd is compared using startswith
  *
+ * allow_stop_reply -> true iff the gdbstub can respond to this command with a
+ *   "stop reply" packet. The list of commands that accept such response is
+ *   defined at the GDB Remote Serial Protocol documentation. see:
+ *   https://sourceware.org/gdb/onlinedocs/gdb/Stop-Reply-Packets.html#Stop-Reply-Packets.
  *
  * schema definitions:
  * Each schema parameter entry consists of 2 chars,
@@ -802,6 +806,7 @@ typedef struct GdbCmdParseEntry {
     const char *cmd;
     bool cmd_startswith;
     const char *schema;
+    bool allow_stop_reply;
 } GdbCmdParseEntry;
 
 static inline int startswith(const char *string, const char *pattern)
@@ -835,6 +840,7 @@ static int process_string_cmd(void *user_ctx, const char *data,
             }
         }
 
+        gdbserver_state.allow_stop_reply = cmd->allow_stop_reply;
         cmd->handler(params, user_ctx);
         return 0;
     }
@@ -1283,11 +1289,14 @@ static void handle_v_attach(GArray *params, void *user_ctx)
     gdbserver_state.g_cpu = cpu;
     gdbserver_state.c_cpu = cpu;
 
-    g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
-    gdb_append_thread_id(cpu, gdbserver_state.str_buf);
-    g_string_append_c(gdbserver_state.str_buf, ';');
+    if (gdbserver_state.allow_stop_reply) {
+        g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
+        gdb_append_thread_id(cpu, gdbserver_state.str_buf);
+        g_string_append_c(gdbserver_state.str_buf, ';');
+        gdbserver_state.allow_stop_reply = false;
 cleanup:
-    gdb_put_strbuf();
+        gdb_put_strbuf();
+    }
 }
 
 static void handle_v_kill(GArray *params, void *user_ctx)
@@ -1310,12 +1319,14 @@ static const GdbCmdParseEntry gdb_v_commands_table[] = {
         .handler = handle_v_cont,
         .cmd = "Cont",
         .cmd_startswith = 1,
+        .allow_stop_reply = true,
         .schema = "s0"
     },
     {
         .handler = handle_v_attach,
         .cmd = "Attach;",
         .cmd_startswith = 1,
+        .allow_stop_reply = true,
         .schema = "l0"
     },
     {
@@ -1698,10 +1709,13 @@ static void handle_gen_set(GArray *params, void *user_ctx)
 
 static void handle_target_halt(GArray *params, void *user_ctx)
 {
-    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, ';');
-    gdb_put_strbuf();
+    if (gdbserver_state.allow_stop_reply) {
+        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, ';');
+        gdb_put_strbuf();
+        gdbserver_state.allow_stop_reply = false;
+    }
     /*
      * Remove all the breakpoints when this query is issued,
      * because gdb is doing an initial connect and the state
@@ -1725,7 +1739,8 @@ static int gdb_handle_packet(const char *line_buf)
             static const GdbCmdParseEntry target_halted_cmd_desc = {
                 .handler = handle_target_halt,
                 .cmd = "?",
-                .cmd_startswith = 1
+                .cmd_startswith = 1,
+                .allow_stop_reply = true,
             };
             cmd_parser = &target_halted_cmd_desc;
         }
@@ -1736,6 +1751,7 @@ static int gdb_handle_packet(const char *line_buf)
                 .handler = handle_continue,
                 .cmd = "c",
                 .cmd_startswith = 1,
+                .allow_stop_reply = true,
                 .schema = "L0"
             };
             cmd_parser = &continue_cmd_desc;
@@ -1747,6 +1763,7 @@ static int gdb_handle_packet(const char *line_buf)
                 .handler = handle_cont_with_sig,
                 .cmd = "C",
                 .cmd_startswith = 1,
+                .allow_stop_reply = true,
                 .schema = "l0"
             };
             cmd_parser = &cont_with_sig_cmd_desc;
@@ -1785,6 +1802,7 @@ static int gdb_handle_packet(const char *line_buf)
                 .handler = handle_step,
                 .cmd = "s",
                 .cmd_startswith = 1,
+                .allow_stop_reply = true,
                 .schema = "L0"
             };
             cmd_parser = &step_cmd_desc;
@@ -1976,6 +1994,7 @@ void gdb_read_byte(uint8_t ch)
 {
     uint8_t reply;
 
+    gdbserver_state.allow_stop_reply = false;
 #ifndef CONFIG_USER_ONLY
     if (gdbserver_state.last_packet->len) {
         /* Waiting for a response to the last packet.  If we see the start
diff --git a/gdbstub/internals.h b/gdbstub/internals.h
index 94ddff4..33d21d6 100644
--- a/gdbstub/internals.h
+++ b/gdbstub/internals.h
@@ -65,6 +65,11 @@ typedef struct GDBState {
     GByteArray *mem_buf;
     int sstep_flags;
     int supported_sstep_flags;
+    /*
+     * Whether we are allowed to send a stop reply packet at this moment.
+     * Must be set off after sending the stop reply itself.
+     */
+    bool allow_stop_reply;
 } GDBState;
 
 /* lives in main gdbstub.c */
diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c
index 22ecd09..99d994e 100644
--- a/gdbstub/softmmu.c
+++ b/gdbstub/softmmu.c
@@ -43,6 +43,7 @@ static void reset_gdbserver_state(void)
     g_free(gdbserver_state.processes);
     gdbserver_state.processes = NULL;
     gdbserver_state.process_num = 0;
+    gdbserver_state.allow_stop_reply = false;
 }
 
 /*
@@ -139,6 +140,10 @@ static void gdb_vm_state_change(void *opaque, bool running, RunState state)
         return;
     }
 
+    if (!gdbserver_state.allow_stop_reply) {
+        return;
+    }
+
     gdb_append_thread_id(cpu, tid);
 
     switch (state) {
@@ -205,6 +210,7 @@ static void gdb_vm_state_change(void *opaque, bool running, RunState state)
 
 send_packet:
     gdb_put_packet(buf->str);
+    gdbserver_state.allow_stop_reply = false;
 
     /* disable single step if it was enabled */
     cpu_single_step(cpu, 0);
@@ -422,8 +428,11 @@ void gdb_exit(int code)
 
     trace_gdbstub_op_exiting((uint8_t)code);
 
-    snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
-    gdb_put_packet(buf);
+    if (gdbserver_state.allow_stop_reply) {
+        snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
+        gdb_put_packet(buf);
+        gdbserver_state.allow_stop_reply = false;
+    }
 
     qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
 }
diff --git a/gdbstub/user.c b/gdbstub/user.c
index 80488b6..5b375be 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -108,8 +108,11 @@ void gdb_exit(int code)
 
     trace_gdbstub_op_exiting((uint8_t)code);
 
-    snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
-    gdb_put_packet(buf);
+    if (gdbserver_state.allow_stop_reply) {
+        snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
+        gdb_put_packet(buf);
+        gdbserver_state.allow_stop_reply = false;
+    }
 }
 
 int gdb_handlesig(CPUState *cpu, int sig)
@@ -127,11 +130,14 @@ int gdb_handlesig(CPUState *cpu, int sig)
 
     if (sig != 0) {
         gdb_set_stop_cpu(cpu);
-        g_string_printf(gdbserver_state.str_buf,
-                        "T%02xthread:", gdb_target_signal_to_gdb(sig));
-        gdb_append_thread_id(cpu, gdbserver_state.str_buf);
-        g_string_append_c(gdbserver_state.str_buf, ';');
-        gdb_put_strbuf();
+        if (gdbserver_state.allow_stop_reply) {
+            g_string_printf(gdbserver_state.str_buf,
+                            "T%02xthread:", gdb_target_signal_to_gdb(sig));
+            gdb_append_thread_id(cpu, gdbserver_state.str_buf);
+            g_string_append_c(gdbserver_state.str_buf, ';');
+            gdb_put_strbuf();
+            gdbserver_state.allow_stop_reply = false;
+        }
     }
     /*
      * gdb_put_packet() might have detected that the peer terminated the
@@ -174,12 +180,14 @@ void gdb_signalled(CPUArchState *env, int sig)
 {
     char buf[4];
 
-    if (!gdbserver_state.init || gdbserver_user_state.fd < 0) {
+    if (!gdbserver_state.init || gdbserver_user_state.fd < 0 ||
+        !gdbserver_state.allow_stop_reply) {
         return;
     }
 
     snprintf(buf, sizeof(buf), "X%02x", gdb_target_signal_to_gdb(sig));
     gdb_put_packet(buf);
+    gdbserver_state.allow_stop_reply = false;
 }
 
 static void gdb_accept_init(int fd)