1 /* Definitions for PA_RISC with ELF format on 64-bit Linux 2 Copyright (C) 1999-2015 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #if 0 /* needs some work :-( */ 21 /* If defined, this macro specifies a table of register pairs used to 22 eliminate unneeded registers that point into the stack frame. */ 23 24 #define ELIMINABLE_REGS \ 25 { \ 26 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 27 {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 28 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \ 29 } 30 31 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'. It 32 specifies the initial difference between the specified pair of 33 registers. This macro must be defined if `ELIMINABLE_REGS' is 34 defined. */ 35 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 36 do \ 37 { \ 38 int fsize; \ 39 \ 40 fsize = pa_compute_frame_size (get_frame_size (), 0); \ 41 if ((TO) == FRAME_POINTER_REGNUM \ 42 && (FROM) == ARG_POINTER_REGNUM) \ 43 { \ 44 (OFFSET) = -16; \ 45 break; \ 46 } \ 47 \ 48 gcc_assert ((TO) == STACK_POINTER_REGNUM); \ 49 \ 50 switch (FROM) \ 51 { \ 52 case FRAME_POINTER_REGNUM: \ 53 (OFFSET) = - fsize; \ 54 break; \ 55 \ 56 case ARG_POINTER_REGNUM: \ 57 (OFFSET) = - fsize - 16; \ 58 break; \ 59 \ 60 default: \ 61 gcc_unreachable (); \ 62 } \ 63 } while (0) 64 #endif 65