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135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/* Traditional frame unwind support, for GDB the GNU Debugger.
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Copyright 2003 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "trad-frame.h"
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#include "regcache.h"
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/* A traditional frame is unwound by analysing the function prologue
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and using the information gathered to track registers. For
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non-optimized frames, the technique is reliable (just need to check
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for all potential instruction sequences). */
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struct trad_frame_saved_reg *
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trad_frame_alloc_saved_regs (struct frame_info *next_frame)
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{
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int regnum;
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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int numregs = NUM_REGS + NUM_PSEUDO_REGS;
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struct trad_frame_saved_reg *this_saved_regs
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= FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
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for (regnum = 0; regnum < numregs; regnum++)
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{
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this_saved_regs[regnum].realreg = regnum;
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this_saved_regs[regnum].addr = -1;
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}
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return this_saved_regs;
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}
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enum { REG_VALUE = -1, REG_UNKNOWN = -2 };
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int
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trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
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{
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return (this_saved_regs[regnum].realreg == REG_VALUE);
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}
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int
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trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum)
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{
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return (this_saved_regs[regnum].realreg >= 0
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&& this_saved_regs[regnum].addr != -1);
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}
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int
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trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
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int regnum)
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{
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return (this_saved_regs[regnum].realreg >= 0
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&& this_saved_regs[regnum].addr == -1);
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}
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void
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trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
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int regnum, LONGEST val)
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{
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/* Make the REALREG invalid, indicating that the ADDR contains the
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register's value. */
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this_saved_regs[regnum].realreg = REG_VALUE;
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this_saved_regs[regnum].addr = val;
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}
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void
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trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
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int regnum)
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{
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/* Make the REALREG invalid, indicating that the value is not known. */
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this_saved_regs[regnum].realreg = REG_UNKNOWN;
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this_saved_regs[regnum].addr = -1;
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}
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void
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trad_frame_prev_register (struct frame_info *next_frame,
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struct trad_frame_saved_reg this_saved_regs[],
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realregp, void *bufferp)
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{
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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if (trad_frame_addr_p (this_saved_regs, regnum))
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{
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/* The register was saved in memory. */
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*optimizedp = 0;
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*lvalp = lval_memory;
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*addrp = this_saved_regs[regnum].addr;
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*realregp = -1;
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if (bufferp != NULL)
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{
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/* Read the value in from memory. */
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get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp,
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register_size (gdbarch, regnum));
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}
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}
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else if (trad_frame_realreg_p (this_saved_regs, regnum))
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{
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/* Ask the next frame to return the value of the register. */
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frame_register_unwind (next_frame, this_saved_regs[regnum].realreg,
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optimizedp, lvalp, addrp, realregp, bufferp);
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}
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else if (trad_frame_value_p (this_saved_regs, regnum))
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{
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/* The register's value is available. */
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*optimizedp = 0;
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*lvalp = not_lval;
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*addrp = 0;
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*realregp = -1;
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if (bufferp != NULL)
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store_unsigned_integer (bufferp, register_size (gdbarch, regnum),
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this_saved_regs[regnum].addr);
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}
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else
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{
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error ("Register %s not available",
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gdbarch_register_name (gdbarch, regnum));
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}
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}
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