Chapter 8. Assembler Directives
45
The syntax for
.comm
differs slightly on the HPPA. The syntax is
symbol .comm, length
;
symbol
is optional.
8.9.
.cfi_startproc
.cfi_startproc
is used at the beginning of each function that should have an entry in
.eh_frame
.
It initializes some internal data structures and emits architecture dependent initial CFI instructions.
Don't forget to close the function by
.cfi_endproc
.
8.10.
.cfi_endproc
.cfi_endproc
is used at the end of a function where it closes its unwind entry previously opened by
.cfi_startproc
. and emits it to
.eh_frame
.
8.11.
.cfi_def_cfa register, offset
.cfi_def_cfa
defines a rule for computing CFA as: take address from register and add offset to it.
8.12.
.cfi_def_cfa_register register
.cfi_def_cfa_register
modifies a rule for computing CFA. From now on
register
will be
used instead of the old one. Offset remains the same.
8.13.
.cfi_def_cfa_offset offset
.cfi_def_cfa_offset
modifies a rule for computing CFA. Register remains the same, but
offset
is new. Note that it is the absolute offset that will be added to a defined register to compute CFA
address.
8.14.
.cfi_adjust_cfa_offset offset
Same as
.cfi_def_cfa_offset
but
offset
is a relative value that is added/substracted from the
previous offset.
8.15.
.cfi_offset register, offset
Previous value of
register
is saved at offset
offset
from CFA.
8.16.
.cfi_rel_offset register, offset
Previous value of
register
is saved at offset
offset
from the current CFA register. This is trans 
formed to
.cfi_offset
using the known displacement of the CFA register from the CFA. This is
often easier to use, because the number will match the code it's annotating.






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