xnu-3789.1.32.tar.gz

[apple/xnu.git] / libkern / os / internal.c

diff --git a/libkern/os/internal.c b/libkern/os/internal.c
new file mode 100644 (file)
index 0000000..fca4dc0
--- /dev/null
+++ b/libkern/os/internal.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2013-2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include "trace_internal.h"
+#include <mach-o/loader.h>
+#include <string.h>
+
+static bool
+_os_trace_addr_in_text_segment_32(const void *dso, const void *addr)
+{
+    const struct mach_header *mhp = (const struct mach_header *) dso;
+    const struct segment_command *sgp = (const struct segment_command *)(const void *)((const char *)mhp + sizeof(struct mach_header));
+
+    for (uint32_t i = 0; i < mhp->ncmds; i++) {
+        if (sgp->cmd == LC_SEGMENT) {
+            if (strncmp(sgp->segname, SEG_TEXT, sizeof(sgp->segname)) == 0) {
+                return ((uintptr_t)addr >= (sgp->vmaddr) && (uintptr_t)addr < (sgp->vmaddr + sgp->vmsize));
+            }
+        }
+        sgp = (const struct segment_command *)(const void *)((const char *)sgp + sgp->cmdsize);
+    }
+
+    return false;
+}
+
+static bool
+_os_trace_addr_in_text_segment_64(const void *dso, const void *addr)
+{
+    const struct mach_header_64 *mhp = (const struct mach_header_64 *) dso;
+    const struct segment_command_64 *sgp = (const struct segment_command_64 *)(const void *)((const char *)mhp + sizeof(struct mach_header_64));
+
+    for (uint32_t i = 0; i < mhp->ncmds; i++) {
+        if (sgp->cmd == LC_SEGMENT_64) {
+            if (strncmp(sgp->segname, SEG_TEXT, sizeof(sgp->segname)) == 0) {
+                return ((uintptr_t)addr >= (sgp->vmaddr) && (uintptr_t)addr < (sgp->vmaddr + sgp->vmsize));
+            }
+        }
+        sgp = (const struct segment_command_64 *)(const void *)((const char *)sgp + sgp->cmdsize);
+    }
+
+    return false;
+}
+
+bool
+_os_trace_addr_in_text_segment(const void *dso, const void *addr)
+{
+    const struct mach_header *mhp = (const struct mach_header *) dso;
+    bool retval = false;
+
+    switch (mhp->magic) {
+        case MH_MAGIC:
+            retval = _os_trace_addr_in_text_segment_32(dso, addr);
+            break;
+
+        case MH_MAGIC_64:
+            retval = _os_trace_addr_in_text_segment_64(dso, addr);
+            break;
+
+        default:
+            retval = false;
+            break;
+    }
+
+    return retval;
+}