michaelh/zephyr
1
0
Fork 0
Code Releases Activity

Fix struct offsets (DWARF v2 compatibility)

Browse source 
For DWARF v2, DW_AT_data_member_location is encoded as a set of operations. The member_offset is in that case a list that starts with an operation (typically DW_OP_plus_uconst), so member_offset[0] is not the offset.

This solves the kernel/poll test (issue #7885)
This commit is contained in:
ruuddw 2018-05-25 15:53:27 +02:00
commit 8364b223e4
1 changed files with 9 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

10
scripts/elf_helper.py
View file

@ -144,7 +144,15 @@ class AggregateTypeMember:
self.member_name = member_name
self.member_type = member_type
if isinstance(member_offset, list):
self.member_offset = member_offset[0]
# DWARF v2, location encoded as set of operations
# only "DW_OP_plus_uconst" with ULEB128 argument supported
if member_offset[0]==0x23:
self.member_offset = member_offset[1] & 0x7f
for i in range(1, len(member_offset)-1):
if (member_offset[i] & 0x80):
self.member_offset += (member_offset[i+1] & 0x7f) << i*7
else:
debug_die("not yet supported location operation")
else:
self.member_offset = member_offset