This patch
http://sourceware.org/ml/binutils/2004-11/msg00226.html
introduced size_of_output_cie_fde to compute the size of CIE/FDE:
size_of_output_cie_fde (struct eh_cie_fde *entry, unsigned int alignment)
offset += size_of_output_cie_fde (ent, ptr_size);
new_size = size_of_output_cie_fde (ent, ptr_size);
new_size = size_of_output_cie_fde (ent, ptr_size);
It asssumed that CIE/FDE were aligned at the pointer size. But there are
no such a requirment. On RHEL3 U7/x86-64,
File: libc.a(sysdep.o)
The section .eh_frame contains:
00000000 00000012 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 1
Data alignment factor: -8
Return address column: 16
Augmentation data: 1b
DW_CFA_def_cfa: r7 ofs 8
DW_CFA_offset: r16 at cfa-8
00000016 00000016 0000001a FDE cie=00000000 pc=00000000..00000014
DW_CFA_advance_loc: 4 to 00000004
DW_CFA_def_cfa_offset: 16
DW_CFA_advance_loc: 6 to 0000000a
DW_CFA_def_cfa_offset: 8
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
The second FDE isn't aligned at 8 byte.
--
Summary: Incorrect assumption on the CIE/FDE alignment
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: hjl at lucon dot org
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=2657
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