1/* Definitions for PA_RISC with ELF format on 64-bit Linux 2 Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU CC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21#if 0 /* needs some work :-( */ 22/* If defined, this macro specifies a table of register pairs used to 23 eliminate unneeded registers that point into the stack frame. */ 24 25#define ELIMINABLE_REGS \ 26{ \ 27 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 28 {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ 29 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \ 30} 31 32/* A C expression that returns nonzero if the compiler is allowed to try to 33 replace register number FROM with register number TO. The frame pointer 34 is automatically handled. */ 35 36#define CAN_ELIMINATE(FROM, TO) 1 37 38/* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'. It 39 specifies the initial difference between the specified pair of 40 registers. This macro must be defined if `ELIMINABLE_REGS' is 41 defined. */ 42#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 43 do \ 44 { \ 45 int fsize; \ 46 \ 47 fsize = compute_frame_size (get_frame_size (), 0); \ 48 if ((TO) == FRAME_POINTER_REGNUM \ 49 && (FROM) == ARG_POINTER_REGNUM) \ 50 { \ 51 (OFFSET) = -16; \ 52 break; \ 53 } \ 54 \ 55 if ((TO) != STACK_POINTER_REGNUM) \ 56 abort (); \ 57 \ 58 switch (FROM) \ 59 { \ 60 case FRAME_POINTER_REGNUM: \ 61 (OFFSET) = - fsize; \ 62 break; \ 63 \ 64 case ARG_POINTER_REGNUM: \ 65 (OFFSET) = - fsize - 16; \ 66 break; \ 67 \ 68 default: \ 69 abort (); \ 70 } \ 71 } while (0) 72#endif 73