[PATCH v3 4/4] tests/tcg: add HeapInfo checking to semihosting test

[Alex Bennée]

Query the SYS_HEAPINFO semicall and do some basic verification of the
information via libc calls.

Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
---
 .../multiarch/arm-compat-semi/semihosting.c   | 35 ++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/tests/tcg/multiarch/arm-compat-semi/semihosting.c 
b/tests/tcg/multiarch/arm-compat-semi/semihosting.c
index b3fd16cd12..5fa3c0a82d 100644
--- a/tests/tcg/multiarch/arm-compat-semi/semihosting.c
+++ b/tests/tcg/multiarch/arm-compat-semi/semihosting.c
@@ -8,9 +8,16 @@
  */
 
 #define SYS_WRITE0      0x04
+#define SYS_HEAPINFO    0x16
 #define SYS_REPORTEXC   0x18
 
+#define _GNU_SOURCE  /* asprintf is a GNU extension */
+
 #include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
 #include "semicall.h"
 
 int main(int argc, char *argv[argc])
@@ -21,8 +28,34 @@ int main(int argc, char *argv[argc])
     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;
+    char *heap_info, *stack_info;
+    void *brk = sbrk(0);
+
+    __semi_call(SYS_WRITE0, (uintptr_t) "Checking HeapInfo\n");
+
+    memset(&info, 0, sizeof(info));
+    __semi_call(SYS_HEAPINFO, (uintptr_t) &ptr_to_info);
+
+    asprintf(&heap_info, "heap: %p -> %p\n", info.heap_base, info.heap_limit);
+    __semi_call(SYS_WRITE0, (uintptr_t) heap_info);
+    if (info.heap_base != brk) {
+        sprintf(heap_info, "heap mismatch: %p\n", brk);
+        __semi_call(SYS_WRITE0, (uintptr_t) heap_info);
+        return -1;
+    }
+
+    asprintf(&stack_info, "stack: %p -> %p\n", info.stack_base, 
info.stack_limit);
+    __semi_call(SYS_WRITE0, (uintptr_t) stack_info);
+    free(heap_info);
+    free(stack_info);
 
-    __semi_call(SYS_WRITE0, (uintptr_t) "Hello World");
     __semi_call(SYS_REPORTEXC, exit_code);
     /* if we get here we failed */
     return -1;
-- 
2.20.1