1 files changed, 82 insertions, 0 deletions
diff --git a/build-id.c b/build-id.c
new file mode 100644
index 0000000..94b2e5c
--- /dev/null
+++ b/build-id.c
@@ -0,0 +1,82 @@
+/* vim: set expandtab tabstop=4 softtabstop=4 shiftwidth=4: */
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <elf.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "build-id.h"
+
+extern const ElfW(Nhdr) __note_gnu_build_id_start[] __attribute__((weak));
+extern const ElfW(Nhdr) __note_gnu_build_id_end[] __attribute__((weak));
+
+void
+so_print(void)
+{
+    extern char etext, edata, end;
+    printf("Shared object:\n");
+    printf("    program text (etext)      %10p\n", &etext);
+    printf("    initialized data (edata)  %10p\n", &edata);
+    printf("    uninitialized data (end)  %10p\n", &end);
+    printf("    note section start        %10p\n", __note_gnu_build_id_start);
+    printf("    note section end          %10p\n", __note_gnu_build_id_end);
+}
+
+const ElfW(Nhdr) *
+build_id_find_nhdr(void)
+{
+    const ElfW(Nhdr) *nhdr = (void *)__note_gnu_build_id_start;
+
+    if (__note_gnu_build_id_start >= __note_gnu_build_id_end) {
+        fprintf(stderr, "No .note section\n");
+        return NULL;
+    }
+
+    while (nhdr->n_type != NT_GNU_BUILD_ID)
+    {
+        nhdr = (ElfW(Nhdr) *)
+            ((intptr_t)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz + nhdr->n_descsz);
+
+        if (nhdr >= __note_gnu_build_id_end) {
+            fprintf(stderr, "No .note.gnu.build-id section found\n");
+            return NULL;
+        }
+    }
+
+    return nhdr;
+}
+
+ElfW(Word)
+build_id_length(const ElfW(Nhdr) *nhdr)
+{
+    return nhdr->n_descsz;
+}
+
+void
+build_id_read(const ElfW(Nhdr) *nhdr, unsigned char *build_id)
+{
+    memcpy(build_id,
+           (unsigned char *)nhdr + sizeof(ElfW(Nhdr)) + nhdr->n_namesz,
+           nhdr->n_descsz);
+}