7.9 .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.

7.10 .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.

7.11 .cfi_def_cfa register, offset

.cfi_def_cfa defines a rule for computing CFA as: take address from register and add offset to it.

7.12 .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.

7.13 .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.

7.14 .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.

7.15 .cfi_offset register, offset

Previous value of register is saved at offset offset from CFA.

7.16 .cfi_rel_offset register, offset

Previous value of register is saved at offset offset from the current CFA register. This is transformed 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.

7.17 .cfi_signal_frame

Mark current function as signal trampoline.

7.18 .cfi_window_save

SPARC register window has been saved.

7.19 .cfi_escape expression[, ...]

Allows the user to add arbitrary bytes to the unwind info. One might use this to add OS-specific CFI opcodes, or generic CFI opcodes that GAS does not yet support.