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(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_set_fpreg()  can   only   write   the   contents   of   floating-point   registers.   See
       unw_set_reg(3libunwind) 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() callbacks (see unw_create_addr_space(3libunwind)).

SEE ALSO

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

AUTHOR

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

Programming Library                              29 August 2023                        UNW_SET_FPREG(3libunwind)