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UNW_SET_FPREG(3)	     Programming Library	      UNW_SET_FPREG(3)

NAME
       unw_set_fpreg --	set contents of	floating-point register

SYNOPSIS
       #include	<libunwind.h>

       int unw_set_fpreg(unw_cursor_t *cp, unw_regnum_t	reg, unw_fpreg_t val);

DESCRIPTION
       The unw_set_fpreg() routine sets	the value of register reg in the stack
       frame identified	by cursor cp to	the value passed in val.

       The register numbering is target-dependent and  described  in  separate
       manual  pages (e.g., libunwind-ia64(3) for the IA-64 target).  Further-
       more, the exact set of accessible registers may depend on the  type  of
       frame  that  cp	is referring to. For ordinary stack frames, it is nor-
       mally possible to access	only the preserved  (``callee-saved'')	regis-
       ters  and frame-related registers (such as the stack-pointer). However,
       for signal frames (see unw_is_signal_frame(3)), it is usually  possible
       to access all registers.

       Note that unw_set_fpreg() can only write	the contents of	floating-point
       registers. See unw_set_reg(3) for a way to write	registers which	fit in
       a single	word.

RETURN VALUE
       On  successful  completion,  unw_set_fpreg()  returns 0.	 Otherwise the
       negative	value of one of	the error-codes	below is returned.

THREAD AND SIGNAL SAFETY
       unw_set_fpreg() is thread-safe as well as safe to  use  from  a	signal
       handler.

ERRORS
       UNW_EUNSPEC
	       An unspecified error occurred.

       UNW_EBADREG
	       An  attempt was made to write a register	that is	either invalid
	      or not accessible	in the current frame.

       UNW_EREADONLY
	       An attempt was made to write to a read-only register.

       In addition, unw_set_fpreg() may	return any error returned by  the  ac-
       cess_mem(),  access_reg(),  and access_fpreg() call-backs (see unw_cre-
       ate_addr_space(3)).

SEE ALSO
       libunwind(3),  libunwind-ia64(3),  unw_get_fpreg(3),   unw_is_fpreg(3),
       unw_is_signal_frame(3), unw_set_reg(3)

AUTHOR
       David Mosberger-Tang
       Email: dmosberger@gmail.com
       WWW: http://www.nongnu.org/libunwind/.

Programming Library		16 August 2007		      UNW_SET_FPREG(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR

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