Vaibhav Shrimali <vaibhav.shrimali@xxxxxxxxx> writes: > I can use a hard register for this task. But will it allow me to > modify the memory location, between original return address and saved > frame pointer, stored in it? My point about the hard register was that you can't call force_reg after register allocation. > I think it will be just saved in the "saved registers" area of stack. > The assembly conversion of the prologue I need is: > > POP EAX ; new prologue start > PUSH EAX ; unencrypted return address > PUSH EAX ; duplicate return address > PUSH EBP ; standard prologue > MOVE EBP, ESP > XOR [EBP+4], EBP ; [EBP+4] has EIP and XOR encryptes ret addr(EIP) > > I want to know the function which allows me to write a value at a > memory address specified by a variable (generated by gen_rtx_MEM). > I thought force_reg is the one. Now, can I use ebx/ecx/...etc register > for the purpose. > OR will copy_to_mode_reg() function do the job? > OR is there any other function to do the job? You need to copy your memory location into a register. force_reg copies it into a pseudo-register. You need to copy it into a chosen hard register. Use emit_move_insn. Ian
