gdb/dwarf2cfi.h

   1 /* Stack unwinding code based on dwarf2 frame info for GDB, the GNU debugger.
   2    Copyright 2001
   3    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 DWARF2CFI_H
  23 #define DWARF2CFI_H
  24
  25 struct context_reg
  26 {
  27   union
  28   {
  29     unsigned int reg;
  30     long offset;
  31     CORE_ADDR addr;
  32   }
  33   loc;
  34   enum
  35   {
  36     REG_CTX_UNSAVED,
  37     REG_CTX_SAVED_OFFSET,
  38     REG_CTX_SAVED_REG,
  39     REG_CTX_SAVED_ADDR,
  40     REG_CTX_VALUE,
  41   }
  42   how;
  43 };
  44
  45 /* This is the register and unwind state for a particular frame.  */
  46 struct context
  47 {
  48   struct context_reg *reg;
  49
  50   CORE_ADDR cfa;
  51   CORE_ADDR ra;
  52   void *lsda;
  53   int args_size;
  54 };
  55
  56 /* Return the frame address.  */
  57 CORE_ADDR cfi_read_fp ();
  58
  59 /* Store the frame address.  */
  60 void cfi_write_fp (CORE_ADDR val);
  61
  62 /* Restore the machine to the state it had before the current frame
  63    was created.  */
  64 void cfi_pop_frame (struct frame_info *);
  65
  66 /* Determine the address of the calling function's frame.  */
  67 CORE_ADDR cfi_frame_chain (struct frame_info *fi);
  68
  69 /* Sets the pc of the frame.  */
  70 CORE_ADDR cfi_init_frame_pc (int fromleaf, struct frame_info *fi);
  71
  72 /* Initialize unwind context informations of the frame.  */
  73 void cfi_init_extra_frame_info (int fromleaf, struct frame_info *fi);
  74
  75 /* Obtain return address of the frame.  */
  76 CORE_ADDR cfi_get_ra (struct frame_info *fi);
  77
  78 /* Find register number REGNUM relative to FRAME and put its
  79    (raw) contents in *RAW_BUFFER.  Set *OPTIMIZED if the variable
  80    was optimized out (and thus can't be fetched).  If the variable
  81    was fetched from memory, set *ADDRP to where it was fetched from,
  82    otherwise it was fetched from a register.
  83
  84    The argument RAW_BUFFER must point to aligned memory.  */
  85 void cfi_get_saved_register (char *raw_buffer,
  86                              int *optimized,
  87                              CORE_ADDR *addrp,
  88                              struct frame_info *frame,
  89                              int regnum, enum lval_type *lval);
  90
  91 /*  Return the register that the function uses for a frame pointer,
  92     plus any necessary offset to be applied to the register before
  93     any frame pointer offsets.  */
  94 void cfi_virtual_frame_pointer (CORE_ADDR pc, int *frame_regnum,
  95                                 LONGEST * frame_offset);
  96
  97 struct context *context_alloc ();
  98 void context_cpy (struct context *dst, struct context *src);
  99 struct frame_state *frame_state_alloc ();
 100 #endif