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).   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_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   access_mem(),
       access_reg(), and access_fpreg() call-backs (see unw_create_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/.