From 799f46a3e38bbfa28fb0bc47ef73b63fa40c421f Mon Sep 17 00:00:00 2001
From: Snaipe <franklinmathieu@gmail.com>
Date: Fri, 7 Aug 2015 19:49:04 -0700
Subject: [PATCH] [Issue #30] Added special accessors for section limits on OS
 X

---
 src/posix-compat.c | 27 +++++++++++++++++++++++++++
 src/posix-compat.h |  5 +++++
 2 files changed, 32 insertions(+)

diff --git a/src/posix-compat.c b/src/posix-compat.c
index 2056baa..037a0aa 100644
--- a/src/posix-compat.c
+++ b/src/posix-compat.c
@@ -360,3 +360,30 @@ void *get_win_section_end(const char *section) {
     return NULL;
 }
 #endif
+
+#ifdef __APPLE__
+# include <mach-o/getsect.h>
+# include <mach-o/dyld.h>
+
+# define BASE_IMAGE_INDEX 0
+
+static inline void *get_real_address(void *addr) {
+    if (!addr)
+        return NULL;
+
+    // We need to slide the section address to get a valid pointer
+    // because ASLR will shift the image by a random offset
+    return addr + _dyld_get_image_vmaddr_slide(BASE_IMAGE_INDEX);
+}
+
+void *get_osx_section_start(const char *section) {
+    unsigned long secsize;
+    return get_real_address(getsectdata("__DATA", section, &secsize));
+}
+
+void *get_osx_section_end(const char *section) {
+    unsigned long secsize;
+    char *section_start = getsectdata("__DATA", section, &secsize);
+    return get_real_address(section_start) + secsize;
+}
+#endif
diff --git a/src/posix-compat.h b/src/posix-compat.h
index e4b8d5e..82da12c 100644
--- a/src/posix-compat.h
+++ b/src/posix-compat.h
@@ -81,6 +81,11 @@ void *get_win_section_start(const char *section);
 void *get_win_section_end(const char *section);
 #  define GET_SECTION_START(Name) get_win_section_start(#Name)
 #  define GET_SECTION_END(Name)   get_win_section_end(#Name)
+# elif defined(__APPLE__)
+void *get_osx_section_start(const char *section);
+void *get_osx_section_end(const char *section);
+#  define GET_SECTION_START(Name) get_osx_section_start(#Name)
+#  define GET_SECTION_END(Name)   get_osx_section_end(#Name)
 # else
 #  define GET_SECTION_START(Name) SECTION_START(Name)
 #  define GET_SECTION_END(Name)   SECTION_END(Name)