desc_prologue    1155 arch/ia64/kernel/unwind.c #define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg)	desc_prologue(0,r,m,gr,arg)
desc_prologue    1156 arch/ia64/kernel/unwind.c #define UNW_DEC_PROLOGUE(fmt,b,r,arg)		desc_prologue(b,r,0,32,arg)