Import of the watch repository from Pebble

tools/elf_sections.py

@@ -0,0 +1,86 @@
+#! /usr/bin/env python
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# elf_sections.py
+# This script analyses the specified .elf and provides output similar to readelf -S.
+# The sections are sorted by start address and gaps/overlaps in the memory map are displayed.
+
+import argparse
+
+from elftools.elf.elffile import ELFFile
+
+EXCLUDED_SECTIONS = ['.log_strings']
+
+BT_DIALOG_SECTION_START = ('** RAM Start **', 0x7FC0000, 0)
+BT_DIALOG_SECTION_END = ('** RAM End **',   0x7FE3FFF, 0)
+
+
+# Return a list of sections as a tuple (name, start address, size)
+def _get_sections(elf, all_sections):
+    headers = []
+
+    for nsec, section in enumerate(elf.iter_sections()):
+        if not all_sections:
+            if section['sh_addr'] == 0 or section['sh_size'] == 0 or \
+                    section.name in EXCLUDED_SECTIONS:
+                continue
+        headers.append((section.name, section['sh_addr'], section['sh_size']))
+
+    return headers
+
+
+def _process_elf(filename, verbose=False, all_sections=False, bt=False):
+    with open(filename, 'rb') as f:
+        elffile = ELFFile(f)
+
+        # Sort by the second element (start address)
+        sections = sorted(_get_sections(elffile, all_sections), key=lambda x: x[1])
+        if bt:
+            sections.insert(0, BT_DIALOG_SECTION_START)
+            sections.append(BT_DIALOG_SECTION_END)
+
+        print '%-20s   %10s   %7s   %16s\n' % \
+            ('Section Name', 'Start Addr', 'Size', 'Gap Before Section')
+        previous_section_end_addr = None
+        for s in sections:
+            # Handle the first sections
+            if previous_section_end_addr is None:
+                previous_section_end_addr = s[1] - 1
+                gap = 0
+            else:
+                gap = s[1] - previous_section_end_addr - 1
+
+            if gap == 0:
+                print '%-20s   0x%08X   0x%05X' % (s[0], s[1], s[2])
+            elif gap > 0:
+                print '%-20s   0x%08X   0x%05X             0x%06X' % (s[0], s[1], s[2], gap)
+            elif gap < 0:
+                gap *= -1
+                print '%-20s   0x%08X   0x%05X             0x%06X *** OVERLAP ***' % \
+                    (s[0], s[1], s[2], gap)
+
+            previous_section_end_addr = s[1] + s[2] - 1
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-v', '--verbose', action='store_true')
+    parser.add_argument('-a', '--all', action='store_true', help='Show all sections')
+    parser.add_argument('-b', '--bt', action='store_true', help='Dialog BT .elf')
+    parser.add_argument('elf_file', help='Extracts section info from elf file.')
+    args = parser.parse_args()
+
+    _process_elf(args.elf_file, verbose=args.verbose, all_sections=args.all, bt=args.bt)