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+
+
+
+Emulation of some arm programs fail with "Assertion `have_guest_base' failed."
+
+This issue is observer with QEMU ToT, checked out around May 15th (but I believe it is present in current master too), and wasn't present in QEMU v5.0.0.
+
+I am using 32-bit Intel(R) Pentium(R) M processor 1.73GHz host.
+
+Arm cross-compiler is a standard cross-compiler that comes with Debian-based distributions, and gcc version is:
+
+$ arm-linux-gnueabi-gcc --version
+arm-linux-gnueabi-gcc (Debian 8.3.0-2) 8.3.0
+
+Compile this program with cross compiler:
+
+$ arm-linux-gnueabi-gcc -O2 -static toupper_string.c -o toupper_string-arm
+
+Emulation with QEMU v5.0.0 is correct, and gives expected output:
+
+$ ~/Build/qemu-5.0.0/build-gcc/arm-linux-user/qemu-arm ./toupper_string-arm
+CONTROL RESULT: (toupper_string)
+ nwlrbbmqbhcdarz owkkyhiddqscdxr jmowfrxsjybldbe fsarcbynecdyggx xpklorellnmpapq
+ NWLRBBMQBHCDARZ OWKKYHIDDQSCDXR JMOWFRXSJYBLDBE FSARCBYNECDYGGX XPKLORELLNMPAPQ
+
+While, in case of QEMU master it fails:
+
+$ ~/Build/qemu-master/build-gcc/arm-linux-user/qemu-arm ./toupper_string-arm
+qemu-arm: /home/rtrk/Build/qemu-master/linux-user/elfload.c:2294: probe_guest_base: Assertion `have_guest_base' failed.
+Aborted
+
+There are many other programs that exibit the same behavior. The failure is arm-sprecific.
+
+
+-----------------------------------------------------
+
+source code: (let's call this file toupper_string.c) (similar file is also in attachment)
+
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+
+#define MAX_STRING_LENGHT              15
+#define NUMBER_OF_RANDOM_STRINGS       100
+#define DEFAULT_NUMBER_OF_REPETITIONS  30000
+#define MAX_NUMBER_OF_REPETITIONS      1000000000
+#define NUMBER_OF_CONTROL_PRINT_ITEMS  5
+
+/* Structure for keeping an array of strings */
+struct StringStruct {
+    char chars[MAX_STRING_LENGHT + 1];
+};
+
+/**
+ * Sets characters of the given string to random small letters a-z.
+ * @param s String to get random characters.
+ * @len Length of the input string.
+ */
+static void gen_random_string(char *chars, const int len)
+{
+    static const char letters[] = "abcdefghijklmnopqrstuvwxyz";
+
+    for (size_t i = 0; i < len; i++) {
+        chars[i] = letters[rand() % (sizeof(letters) - 1)];
+    }
+    chars[len] = 0;
+}
+
+void main (int argc, char* argv[])
+{
+    struct StringStruct random_strings[NUMBER_OF_RANDOM_STRINGS];
+    struct StringStruct strings_to_be_uppercased[NUMBER_OF_RANDOM_STRINGS];
+    int32_t number_of_repetitions = DEFAULT_NUMBER_OF_REPETITIONS;
+    int32_t option;
+
+    /* Parse command line options */
+    while ((option = getopt(argc, argv, "n:")) != -1) {
+        if (option == 'n') {
+            int32_t user_number_of_repetitions = atoi(optarg);
+            /* Check if the value is a negative number */
+            if (user_number_of_repetitions < 1) {
+                fprintf(stderr, "Error ... Value for option '-n' cannot be a "
+                                "negative number.\n");
+                exit(EXIT_FAILURE);
+            }
+            /* Check if the value is a string or zero */
+            if (user_number_of_repetitions == 0) {
+                fprintf(stderr, "Error ... Invalid value for option '-n'.\n");
+                exit(EXIT_FAILURE);
+            }
+            /* Check if the value is too large */
+            if (user_number_of_repetitions > MAX_NUMBER_OF_REPETITIONS) {
+                fprintf(stderr, "Error ... Value for option '-n' cannot be "
+                                "more than %d.\n", MAX_NUMBER_OF_REPETITIONS);
+                exit(EXIT_FAILURE);
+            }
+            number_of_repetitions = user_number_of_repetitions;
+        } else {
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    /* Create an array of strings with random content */
+    srand(1);
+    for (size_t i = 0; i < NUMBER_OF_RANDOM_STRINGS; i++) {
+        gen_random_string(random_strings[i].chars, MAX_STRING_LENGHT);
+    }
+
+    /* Perform uppercasing of a set of random strings multiple times */
+    for (size_t j = 0; j < number_of_repetitions; j++) {
+        /* Copy initial set of random strings to the set to be uppercased */
+        memcpy(strings_to_be_uppercased, random_strings,
+               NUMBER_OF_RANDOM_STRINGS * (MAX_STRING_LENGHT + 1));
+        /* Do actual changing case to uppercase */
+        for (size_t i = 0; i < NUMBER_OF_RANDOM_STRINGS; i++) {
+            int k = 0;
+  
+            while (strings_to_be_uppercased[i].chars[k]) { 
+                char ch = strings_to_be_uppercased[i].chars[k] - 32; 
+                memcpy((void *)strings_to_be_uppercased[i].chars + k,
+                       &ch, 1);
+                k++; 
+            } 
+        }
+    }
+
+    /* Control printing */
+    printf("CONTROL RESULT: (toupper_string)\n");
+    for (size_t i = 0; i < NUMBER_OF_CONTROL_PRINT_ITEMS; i++) {
+        printf(" %s", random_strings[i].chars);
+    }
+    printf("\n");
+    for (size_t i = 0; i < NUMBER_OF_CONTROL_PRINT_ITEMS; i++) {
+        printf(" %s", strings_to_be_uppercased[i].chars);
+    }
+    printf("\n");
+}
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