450 lines
9.8 KiB
C
450 lines
9.8 KiB
C
/* Target-machine dependent code for Zilog Z8000, for GDB.
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Copyright (C) 1992, 1993, 1994 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, Boston, MA 02111-1307, USA. */
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/*
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Contributed by Steve Chamberlain
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sac@cygnus.com
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*/
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#include "defs.h"
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#include "frame.h"
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#include "obstack.h"
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#include "symtab.h"
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#include "gdbcmd.h"
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#include "gdbtypes.h"
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#include "dis-asm.h"
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#include "gdbcore.h"
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/* Return the saved PC from this frame.
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If the frame has a memory copy of SRP_REGNUM, use that. If not,
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just use the register SRP_REGNUM itself. */
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CORE_ADDR
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frame_saved_pc (frame)
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struct frame_info *frame;
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{
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return read_memory_pointer (frame->frame + (BIG ? 4 : 2));
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}
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#define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
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#define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
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#define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
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#define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
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#define IS_SUB2_SP(x) (x==0x1b87)
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#define IS_MOVK_R5(x) (x==0x7905)
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#define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
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#define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))
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/* work out how much local space is on the stack and
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return the pc pointing to the first push */
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static CORE_ADDR
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skip_adjust (pc, size)
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CORE_ADDR pc;
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int *size;
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{
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*size = 0;
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if (IS_PUSH_FP (read_memory_short (pc))
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&& IS_MOV_SP_FP (read_memory_short (pc + 2)))
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{
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/* This is a function with an explict frame pointer */
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pc += 4;
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*size += 2; /* remember the frame pointer */
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}
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/* remember any stack adjustment */
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if (IS_SUB_SP (read_memory_short (pc)))
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{
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*size += read_memory_short (pc + 2);
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pc += 4;
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}
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return pc;
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}
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int
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examine_frame (pc, regs, sp)
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CORE_ADDR pc;
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struct frame_saved_regs *regs;
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CORE_ADDR sp;
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{
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int w = read_memory_short (pc);
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int offset = 0;
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int regno;
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for (regno = 0; regno < NUM_REGS; regno++)
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regs->regs[regno] = 0;
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while (IS_PUSHW (w) || IS_PUSHL (w))
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{
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/* work out which register is being pushed to where */
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if (IS_PUSHL (w))
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{
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regs->regs[w & 0xf] = offset;
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regs->regs[(w & 0xf) + 1] = offset + 2;
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offset += 4;
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}
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else
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{
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regs->regs[w & 0xf] = offset;
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offset += 2;
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}
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pc += 2;
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w = read_memory_short (pc);
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}
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if (IS_MOVE_FP (w))
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{
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/* We know the fp */
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}
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else if (IS_SUB_SP (w))
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{
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/* Subtracting a value from the sp, so were in a function
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which needs stack space for locals, but has no fp. We fake up
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the values as if we had an fp */
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regs->regs[FP_REGNUM] = sp;
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}
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else
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{
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/* This one didn't have an fp, we'll fake it up */
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regs->regs[SP_REGNUM] = sp;
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}
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/* stack pointer contains address of next frame */
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/* regs->regs[fp_regnum()] = fp;*/
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regs->regs[SP_REGNUM] = sp;
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return pc;
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}
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CORE_ADDR
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z8k_skip_prologue (start_pc)
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CORE_ADDR start_pc;
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{
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struct frame_saved_regs dummy;
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return examine_frame (start_pc, &dummy, 0);
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}
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CORE_ADDR
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z8k_addr_bits_remove (addr)
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CORE_ADDR addr;
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{
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return (addr & PTR_MASK);
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}
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int
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read_memory_pointer (x)
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CORE_ADDR x;
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{
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return read_memory_integer (ADDR_BITS_REMOVE (x), BIG ? 4 : 2);
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}
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CORE_ADDR
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frame_chain (thisframe)
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struct frame_info *thisframe;
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{
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if (thisframe->prev == 0)
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{
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/* This is the top of the stack, let's get the sp for real */
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}
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if (!inside_entry_file (thisframe->pc))
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{
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return read_memory_pointer (thisframe->frame);
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}
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return 0;
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}
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init_frame_pc ()
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{
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abort ();
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}
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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void
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get_frame_saved_regs (frame_info, frame_saved_regs)
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struct frame_info *frame_info;
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struct frame_saved_regs *frame_saved_regs;
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{
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CORE_ADDR pc;
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int w;
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memset (frame_saved_regs, '\0', sizeof (*frame_saved_regs));
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pc = get_pc_function_start (frame_info->pc);
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/* wander down the instruction stream */
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examine_frame (pc, frame_saved_regs, frame_info->frame);
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}
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void
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z8k_push_dummy_frame ()
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{
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abort ();
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}
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int
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gdb_print_insn_z8k (memaddr, info)
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bfd_vma memaddr;
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disassemble_info *info;
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{
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if (BIG)
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return print_insn_z8001 (memaddr, info);
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else
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return print_insn_z8002 (memaddr, info);
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}
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/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
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is not the address of a valid instruction, the address of the next
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instruction beyond ADDR otherwise. *PWORD1 receives the first word
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of the instruction.*/
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CORE_ADDR
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NEXT_PROLOGUE_INSN (addr, lim, pword1)
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CORE_ADDR addr;
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CORE_ADDR lim;
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short *pword1;
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{
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char buf[2];
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if (addr < lim + 8)
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{
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read_memory (addr, buf, 2);
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*pword1 = extract_signed_integer (buf, 2);
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return addr + 2;
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}
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return 0;
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}
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame.
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We cache the result of doing this in the frame_cache_obstack, since
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it is fairly expensive. */
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void
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frame_find_saved_regs (fip, fsrp)
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struct frame_info *fip;
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struct frame_saved_regs *fsrp;
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{
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int locals;
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CORE_ADDR pc;
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CORE_ADDR adr;
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int i;
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memset (fsrp, 0, sizeof *fsrp);
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pc = skip_adjust (get_pc_function_start (fip->pc), &locals);
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{
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adr = FRAME_FP (fip) - locals;
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for (i = 0; i < 8; i++)
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{
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int word = read_memory_short (pc);
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pc += 2;
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if (IS_PUSHL (word))
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{
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fsrp->regs[word & 0xf] = adr;
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fsrp->regs[(word & 0xf) + 1] = adr - 2;
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adr -= 4;
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}
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else if (IS_PUSHW (word))
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{
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fsrp->regs[word & 0xf] = adr;
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adr -= 2;
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}
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else
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break;
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}
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}
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fsrp->regs[PC_REGNUM] = fip->frame + 4;
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fsrp->regs[FP_REGNUM] = fip->frame;
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}
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int
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saved_pc_after_call ()
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{
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return ADDR_BITS_REMOVE
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(read_memory_integer (read_register (SP_REGNUM), PTR_SIZE));
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}
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extract_return_value (type, regbuf, valbuf)
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struct type *type;
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char *regbuf;
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char *valbuf;
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{
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int b;
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int len = TYPE_LENGTH (type);
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for (b = 0; b < len; b += 2)
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{
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int todo = len - b;
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if (todo > 2)
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todo = 2;
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memcpy (valbuf + b, regbuf + b, todo);
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}
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}
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void
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write_return_value (type, valbuf)
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struct type *type;
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char *valbuf;
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{
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int reg;
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int len;
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for (len = 0; len < TYPE_LENGTH (type); len += 2)
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write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
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}
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void
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store_struct_return (addr, sp)
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CORE_ADDR addr;
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CORE_ADDR sp;
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{
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write_register (2, addr);
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}
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void
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print_register_hook (regno)
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int regno;
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{
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if ((regno & 1) == 0 && regno < 16)
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{
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unsigned short l[2];
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read_relative_register_raw_bytes (regno, (char *) (l + 0));
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read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
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printf_unfiltered ("\t");
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printf_unfiltered ("%04x%04x", l[0], l[1]);
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}
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if ((regno & 3) == 0 && regno < 16)
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{
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unsigned short l[4];
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read_relative_register_raw_bytes (regno, (char *) (l + 0));
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read_relative_register_raw_bytes (regno + 1, (char *) (l + 1));
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read_relative_register_raw_bytes (regno + 2, (char *) (l + 2));
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read_relative_register_raw_bytes (regno + 3, (char *) (l + 3));
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printf_unfiltered ("\t");
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printf_unfiltered ("%04x%04x%04x%04x", l[0], l[1], l[2], l[3]);
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}
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if (regno == 15)
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{
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unsigned short rval;
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int i;
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read_relative_register_raw_bytes (regno, (char *) (&rval));
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printf_unfiltered ("\n");
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for (i = 0; i < 10; i += 2)
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{
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printf_unfiltered ("(sp+%d=%04x)", i, read_memory_short (rval + i));
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}
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}
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}
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void
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z8k_pop_frame ()
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{
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}
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struct cmd_list_element *setmemorylist;
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void
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z8k_set_pointer_size (newsize)
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int newsize;
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{
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static int oldsize = 0;
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if (oldsize != newsize)
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{
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printf_unfiltered ("pointer size set to %d bits\n", newsize);
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oldsize = newsize;
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if (newsize == 32)
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{
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BIG = 1;
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}
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else
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{
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BIG = 0;
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}
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_initialize_gdbtypes ();
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}
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}
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static void
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segmented_command (args, from_tty)
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char *args;
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int from_tty;
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{
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z8k_set_pointer_size (32);
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}
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static void
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unsegmented_command (args, from_tty)
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char *args;
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int from_tty;
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{
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z8k_set_pointer_size (16);
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}
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static void
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set_memory (args, from_tty)
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char *args;
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int from_tty;
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{
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printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
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help_list (setmemorylist, "set memory ", -1, gdb_stdout);
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}
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void
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_initialize_z8ktdep ()
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{
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tm_print_insn = gdb_print_insn_z8k;
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add_prefix_cmd ("memory", no_class, set_memory,
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"set the memory model", &setmemorylist, "set memory ", 0,
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&setlist);
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add_cmd ("segmented", class_support, segmented_command,
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"Set segmented memory model.", &setmemorylist);
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add_cmd ("unsegmented", class_support, unsegmented_command,
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"Set unsegmented memory model.", &setmemorylist);
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}
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