Merge tag 'pull-tcg-20230810' of https://gitlab.com/rth7680/qemu into…

… staging

accel/tcg: Avoid reading too much in load_atom_{2,4}
tests/tcg: ensure system-mode gdb tests start stopped
gdbstub: more fixes for client Ctrl-C handling

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# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
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* tag 'pull-tcg-20230810' of https://gitlab.com/rth7680/qemu:
  gdbstub: don't complain about preemptive ACK chars
  gdbstub: more fixes for client Ctrl-C handling
  tests/tcg: ensure system-mode gdb tests start stopped
  accel/tcg: Avoid reading too much in load_atom_{2,4}

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

accel/tcg/ldst_atomicity.c.inc

@@ -404,7 +404,10 @@ static uint16_t load_atom_2(CPUArchState *env, uintptr_t ra,
         return load_atomic2(pv);
     }
     if (HAVE_ATOMIC128_RO) {
-        return load_atom_extract_al16_or_al8(pv, 2);
+        intptr_t left_in_page = -(pi | TARGET_PAGE_MASK);
+        if (likely(left_in_page > 8)) {
+            return load_atom_extract_al16_or_al8(pv, 2);
+        }
     }
 
     atmax = required_atomicity(env, pi, memop);
@@ -443,7 +446,10 @@ static uint32_t load_atom_4(CPUArchState *env, uintptr_t ra,
         return load_atomic4(pv);
     }
     if (HAVE_ATOMIC128_RO) {
-        return load_atom_extract_al16_or_al8(pv, 4);
+        intptr_t left_in_page = -(pi | TARGET_PAGE_MASK);
+        if (likely(left_in_page > 8)) {
+            return load_atom_extract_al16_or_al8(pv, 4);
+        }
     }
 
     atmax = required_atomicity(env, pi, memop);

gdbstub/gdbstub.c

@@ -2059,9 +2059,10 @@ void gdb_read_byte(uint8_t ch)
          * here, but it does expect a stop reply.
          */
         if (ch != 0x03) {
-            warn_report("gdbstub: client sent packet while target running\n");
+            trace_gdbstub_err_unexpected_runpkt(ch);
+        } else {
+            gdbserver_state.allow_stop_reply = true;
         }
-        gdbserver_state.allow_stop_reply = true;
         vm_stop(RUN_STATE_PAUSED);
     } else
 #endif
@@ -2073,6 +2074,11 @@ void gdb_read_byte(uint8_t ch)
                 gdbserver_state.line_buf_index = 0;
                 gdbserver_state.line_sum = 0;
                 gdbserver_state.state = RS_GETLINE;
+            } else if (ch == '+') {
+                /*
+                 * do nothing, gdb may preemptively send out ACKs on
+                 * initial connection
+                 */
             } else {
                 trace_gdbstub_err_garbage(ch);
             }

gdbstub/trace-events

@@ -26,6 +26,7 @@ gdbstub_err_invalid_repeat(uint8_t ch) "got invalid RLE count: 0x%02x"
 gdbstub_err_invalid_rle(void) "got invalid RLE sequence"
 gdbstub_err_checksum_invalid(uint8_t ch) "got invalid command checksum digit: 0x%02x"
 gdbstub_err_checksum_incorrect(uint8_t expected, uint8_t got) "got command packet with incorrect checksum, expected=0x%02x, received=0x%02x"
+gdbstub_err_unexpected_runpkt(uint8_t ch) "unexpected packet (0x%02x) while target running"
 
 # softmmu.c
 gdbstub_hit_watchpoint(const char *type, int cpu_gdb_index, uint64_t vaddr) "Watchpoint hit, type=\"%s\" cpu=%d, vaddr=0x%" PRIx64 ""

tests/guest-debug/run-test.py

@@ -69,13 +69,10 @@ def log(output, msg):
 
     # Launch QEMU with binary
     if "system" in args.qemu:
-        cmd = "%s %s %s -gdb unix:path=%s,server=on" % (args.qemu,
-                                                        args.qargs,
-                                                        args.binary,
-                                                        socket_name)
+        cmd = f'{args.qemu} {args.qargs} {args.binary}' \
+            f' -S -gdb unix:path={socket_name},server=on'
     else:
-        cmd = "%s %s -g %s %s" % (args.qemu, args.qargs, socket_name,
-                                  args.binary)
+        cmd = f'{args.qemu} {args.qargs} -g {socket_name} {args.binary}'
 
     log(output, "QEMU CMD: %s" % (cmd))
     inferior = subprocess.Popen(shlex.split(cmd))

tests/tcg/aarch64/Makefile.target

@@ -9,7 +9,7 @@ AARCH64_SRC=$(SRC_PATH)/tests/tcg/aarch64
 VPATH 		+= $(AARCH64_SRC)
 
 # Base architecture tests
-AARCH64_TESTS=fcvt pcalign-a64
+AARCH64_TESTS=fcvt pcalign-a64 lse2-fault
 
 fcvt: LDFLAGS+=-lm
 

tests/tcg/aarch64/lse2-fault.c

@@ -0,0 +1,38 @@
+#include <sys/mman.h>
+#include <sys/shm.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main()
+{
+    int psize = getpagesize();
+    int id;
+    void *p;
+
+    /*
+     * We need a shared mapping to enter CF_PARALLEL mode.
+     * The easiest way to get that is shmat.
+     */
+    id = shmget(IPC_PRIVATE, 2 * psize, IPC_CREAT | 0600);
+    if (id < 0) {
+        perror("shmget");
+        return 2;
+    }
+    p = shmat(id, NULL, 0);
+    if (p == MAP_FAILED) {
+        perror("shmat");
+        return 2;
+    }
+
+    /* Protect the second page. */
+    if (mprotect(p + psize, psize, PROT_NONE) < 0) {
+        perror("mprotect");
+        return 2;
+    }
+
+    /*
+     * Load 4 bytes, 6 bytes from the end of the page.
+     * On success this will load 0 from the newly allocated shm.
+     */
+    return *(int *)(p + psize - 6);
+}