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(3libunwind) for the IA-64 target).  Furthermore, the exact set of accessible registers may
       depend  on  the type of frame that cp is referring to. For ordinary stack frames, it is normally 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(3libunwind)), 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(3libunwind) 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_create_addr_space(3libunwind)).

SEE ALSO

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

AUTHOR

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

Programming Library                              29 August 2023                        UNW_GET_FPREG(3libunwind)