1/* Traditional frame unwind support, for GDB the GNU Debugger. 2 3 Copyright 2003 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22#ifndef TRAD_FRAME_H 23#define TRAD_FRAME_H 24 25struct frame_info; 26 27/* A traditional saved regs table, indexed by REGNUM, encoding where 28 the value of REGNUM for the previous frame can be found in this 29 frame. 30 31 The table is initialized with an identity encoding (ADDR == -1, 32 REALREG == REGNUM) indicating that the value of REGNUM in the 33 previous frame can be found in register REGNUM (== REALREG) in this 34 frame. 35 36 The initial encoding can then be changed: 37 38 Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value 39 of register REGNUM in the previous frame can be found in memory at 40 ADDR in this frame (addr_p, !realreg_p, !value_p). 41 42 Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the 43 value of register REGNUM in the previous frame is found in register 44 REALREG in this frame (!addr_p, realreg_p, !value_p). 45 46 Call trad_frame_set_value (REALREG == -1) to indicate that the 47 value of register REGNUM in the previous frame is found in ADDR 48 (!addr_p, !realreg_p, value_p). 49 50 Call trad_frame_set_unknown (REALREG == -2) to indicate that the 51 register's value is not known. */ 52 53struct trad_frame_saved_reg 54{ 55 LONGEST addr; /* A CORE_ADDR fits in a longest. */ 56 int realreg; 57}; 58 59/* Encode REGNUM value in the trad-frame. */ 60void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[], 61 int regnum, LONGEST val); 62 63/* Mark REGNUM as unknown. */ 64void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[], 65 int regnum); 66 67/* Convenience functions, return non-zero if the register has been 68 encoded as specified. */ 69int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], 70 int regnum); 71int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], 72 int regnum); 73int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[], 74 int regnum); 75 76 77/* Return a freshly allocated (and initialized) trad_frame array. */ 78struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *next_frame); 79 80/* Given the trad_frame info, return the location of the specified 81 register. */ 82void trad_frame_prev_register (struct frame_info *next_frame, 83 struct trad_frame_saved_reg this_saved_regs[], 84 int regnum, int *optimizedp, 85 enum lval_type *lvalp, CORE_ADDR *addrp, 86 int *realregp, void *bufferp); 87 88#endif 89