Correct build settings for xnu kext. Changed calloc name to avoid potential conflicts

Makefile

@@ -45,6 +45,12 @@ endif
 
 ifeq ($(CAPSTONE_HAS_OSXKERNEL), yes)
 CFLAGS += -DCAPSTONE_HAS_OSXKERNEL
+SDKROOT ?= $(shell xcodebuild -version -sdk macosx Path)
+CFLAGS += -mmacosx-version-min=10.5 \
+		  -isysroot$(SDKROOT) \
+		  -I$(SDKROOT)/System/Library/Frameworks/Kernel.framework/Headers \
+		  -mkernel \
+		  -fno-builtin
 endif
 
 CFLAGS += $(foreach arch,$(LIBARCHS),-arch $(arch))

cs.c

@@ -94,12 +94,12 @@ extern void* kern_os_malloc(size_t size);
 extern void kern_os_free(void* addr);
 extern void* kern_os_realloc(void* addr, size_t nsize);
 
-static void* kern_os_calloc(size_t num, size_t size) {
+static void* cs_kern_os_calloc(size_t num, size_t size) {
 	return kern_os_malloc(num * size); // malloc bzeroes the buffer
 }
 
 cs_malloc_t cs_mem_malloc = kern_os_malloc;
-cs_calloc_t cs_mem_calloc = kern_os_calloc;
+cs_calloc_t cs_mem_calloc = cs_kern_os_calloc;
 cs_realloc_t cs_mem_realloc = kern_os_realloc;
 cs_free_t cs_mem_free = kern_os_free;
 cs_vsnprintf_t cs_vsnprintf = vsnprintf;

make.sh

@@ -143,7 +143,7 @@ case "$TARGET" in
   "ios_armv7" ) build_iOS armv7 $*;;
   "ios_armv7s" ) build_iOS armv7s $*;;
   "ios_arm64" ) build_iOS arm64 $*;;
-  "osx-kernel" ) CAPSTONE_USE_SYS_DYN_MEM=yes CAPSTONE_HAS_OSXKERNEL=yes build $*;;
+  "osx-kernel" ) CAPSTONE_USE_SYS_DYN_MEM=yes CAPSTONE_HAS_OSXKERNEL=yes CAPSTONE_ARCHS=x86 CAPSTONE_SHARED=no CAPSTONE_BUILD_CORE_ONLY=yes build $*;;
   * )
     echo "Usage: $0 ["`grep '^  "' $0 | cut -d '"' -f 2 | tr "\\n" "|"`"]"
     exit 1;;