Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 82 insertions, 0 deletions

diff --git a/tests/tcg/multiarch/arm-compat-semi/semihosting.c b/tests/tcg/multiarch/arm-compat-semi/semihosting.c
new file mode 100644
index 000000000..8627eee3c
--- /dev/null
+++ b/tests/tcg/multiarch/arm-compat-semi/semihosting.c
@@ -0,0 +1,82 @@
+/*
+ * linux-user semihosting checks
+ *
+ * Copyright (c) 2019
+ * Written by Alex Bennée <alex.bennee@linaro.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define SYS_WRITE0      0x04
+#define SYS_HEAPINFO    0x16
+#define SYS_REPORTEXC   0x18
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "semicall.h"
+
+int main(int argc, char *argv[argc])
+{
+#if UINTPTR_MAX == UINT32_MAX
+    uintptr_t exit_code = 0x20026;
+#else
+    uintptr_t exit_block[2] = {0x20026, 0};
+    uintptr_t exit_code = (uintptr_t) &exit_block;
+#endif
+    struct {
+        void *heap_base;
+        void *heap_limit;
+        void *stack_base;
+        void *stack_limit;
+    } info;
+    void *ptr_to_info = (void *) &info;
+
+    __semi_call(SYS_WRITE0, (uintptr_t) "Checking HeapInfo\n");
+
+    memset(&info, 0, sizeof(info));
+    __semi_call(SYS_HEAPINFO, (uintptr_t) &ptr_to_info);
+
+    if (info.heap_base == NULL || info.heap_limit == NULL) {
+        printf("null heap: %p -> %p\n", info.heap_base, info.heap_limit);
+        exit(1);
+    }
+
+    /* Error if heap base is above limit */
+    if ((uintptr_t) info.heap_base >= (uintptr_t) info.heap_limit) {
+        printf("heap base %p >= heap_limit %p\n",
+               info.heap_base, info.heap_limit);
+        exit(2);
+    }
+
+    if (info.stack_base == NULL || info.stack_limit) {
+        printf("null stack: %p -> %p\n", info.stack_base, info.stack_limit);
+        exit(3);
+    }
+
+    /* check our local variables are indeed inside the reported stack */
+    if (ptr_to_info > info.stack_base) {
+        printf("info appears to be above stack: %p > %p\n", ptr_to_info,
+               info.stack_base);
+        exit(4);
+    } else if (ptr_to_info < info.stack_limit) {
+        printf("info appears to be outside stack: %p < %p\n", ptr_to_info,
+               info.stack_limit);
+        exit(5);
+    }
+
+    if (ptr_to_info > info.heap_base && ptr_to_info < info.heap_limit) {
+        printf("info appears to be inside the heap: %p in %p:%p\n",
+               ptr_to_info, info.heap_base, info.heap_limit);
+        exit(6);
+    }
+
+    printf("heap: %p -> %p\n", info.heap_base, info.heap_limit);
+    printf("stack: %p -> %p\n", info.stack_base, info.stack_limit);
+
+    __semi_call(SYS_WRITE0, (uintptr_t) "Passed HeapInfo checks");
+    __semi_call(SYS_REPORTEXC, exit_code);
+    /* if we get here we failed */
+    return -1;
+}