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).   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(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_create_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/.