debian man page for unw_get_fpreg

UNW_GET_FPREG(3)					       Programming Library						  UNW_GET_FPREG(3)

NAME
       unw_get_fpreg -- get contents of floating-point register

SYNOPSIS
       #include <libunwind.h>

       int unw_get_fpreg(unw_cursor_t *cp, unw_regnum_t reg, unw_fpreg_t *valp);

DESCRIPTION
       The  unw_get_fpreg() routine reads the value of floating-point register reg in the stack frame identified by cursor cp and stores the value
       in the variable pointed to by valp.

       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'') registers 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_get_fpreg()  can only read the contents of floating-point registers. See unw_get_fpreg(3) for a way to read registers which
       fit in a single word.

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

THREAD AND SIGNAL SAFETY
       unw_get_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 read a register that is either invalid or not accessible in the current frame.

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

SEE ALSO
       libunwind(3), libunwind-ia64(3), unw_get_reg(3), unw_is_fpreg(3), unw_is_signal_frame(3), unw_set_fpreg(3)

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

Programming Library						  16 August 2007						  UNW_GET_FPREG(3)