------- Comment #3 from jakub at gcc dot gnu dot org 2008-11-18 09:03 -------
libunwind also scales all of DW_CFA_advance_loc{,1,2,4} by code alignment
factor and IMHO it matches the standard wording too:
DW_CFA_advance_loc
The DW_CFA_advance instruction takes a single operand (encoded with the
opcode) that represents a constant delta. The required action is to create a
new table row with a location value that is computed by taking the current
entry's location value and adding the value of delta * code_alignment_factor.
All other values in the new row are initially identical to the current row.
DW_CFA_advance_loc1
The DW_CFA_advance_loc1 instruction takes a single ubyte operand that
represents a constant delta. This instruction is identical to
DW_CFA_advance_loc except for the encoding and size of the delta operand.
Can you submit the trivial fix (replace 3 times (delta) with (scaled) in
dw2gencfi.c to binutils? On the GCC side we'll need to write a configury test
which will fail if this bug is detected and the target has code alignment
factor bigger than 1.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37610
