479 lines
12 KiB
C
479 lines
12 KiB
C
/* Target-machine dependent code for Hitachi H8/300, for GDB.
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Copyright (C) 1988, 1990, 1991 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 "dis-asm.h"
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#include "gdbcmd.h"
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#include "gdbtypes.h"
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#undef NUM_REGS
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#define NUM_REGS 11
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#define UNSIGNED_SHORT(X) ((X) & 0xffff)
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/* an easy to debug H8 stack frame looks like:
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0x6df6 push r6
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0x0d76 mov.w r7,r6
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0x6dfn push reg
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0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
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0x1957 sub.w r5,sp
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*/
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#define IS_PUSH(x) ((x & 0xff00)==0x6d00)
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#define IS_PUSH_FP(x) (x == 0x6df6)
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#define IS_MOVE_FP(x) (x == 0x0d76)
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#define IS_MOV_SP_FP(x) (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_R5SP(x) (x==0x1957)
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static CORE_ADDR examine_prologue ();
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void frame_find_saved_regs ();
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CORE_ADDR
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h8300_skip_prologue (start_pc)
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CORE_ADDR start_pc;
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{
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short int w;
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w = read_memory_unsigned_integer (start_pc, 2);
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/* Skip past all push insns */
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while (IS_PUSH_FP (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Skip past a move to FP */
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if (IS_MOVE_FP (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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/* Skip the stack adjust */
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if (IS_MOVK_R5 (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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if (IS_SUB_R5SP (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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while (IS_SUB2_SP (w))
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{
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start_pc += 2;
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w = read_memory_unsigned_integer (start_pc, 2);
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}
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return start_pc;
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}
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int
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gdb_print_insn_h8300 (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 (h8300hmode)
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return print_insn_h8300h (memaddr, info);
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else
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return print_insn_h8300 (memaddr, info);
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}
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/* Given a GDB frame, determine the address of the calling function's frame.
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This will be used to create a new GDB frame struct, and then
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INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
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For us, the frame address is its stack pointer value, so we look up
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the function prologue to determine the caller's sp value, and return it. */
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CORE_ADDR
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h8300_frame_chain (thisframe)
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struct frame_info *thisframe;
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{
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frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
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return thisframe->fsr->regs[SP_REGNUM];
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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 (fi, fsr)
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struct frame_info *fi;
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struct frame_saved_regs *fsr;
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{
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register CORE_ADDR next_addr;
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register CORE_ADDR *saved_regs;
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register int regnum;
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register struct frame_saved_regs *cache_fsr;
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extern struct obstack frame_cache_obstack;
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CORE_ADDR ip;
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struct symtab_and_line sal;
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CORE_ADDR limit;
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if (!fi->fsr)
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{
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cache_fsr = (struct frame_saved_regs *)
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obstack_alloc (&frame_cache_obstack,
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sizeof (struct frame_saved_regs));
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memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
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fi->fsr = cache_fsr;
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/* Find the start and end of the function prologue. If the PC
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is in the function prologue, we only consider the part that
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has executed already. */
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ip = get_pc_function_start (fi->pc);
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sal = find_pc_line (ip, 0);
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limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc;
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/* This will fill in fields in *fi as well as in cache_fsr. */
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examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
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}
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if (fsr)
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*fsr = *fi->fsr;
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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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INSN_WORD *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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/* Examine the prologue of a function. `ip' points to the first instruction.
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`limit' is the limit of the prologue (e.g. the addr of the first
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linenumber, or perhaps the program counter if we're stepping through).
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`frame_sp' is the stack pointer value in use in this frame.
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`fsr' is a pointer to a frame_saved_regs structure into which we put
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info about the registers saved by this frame.
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`fi' is a struct frame_info pointer; we fill in various fields in it
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to reflect the offsets of the arg pointer and the locals pointer. */
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static CORE_ADDR
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examine_prologue (ip, limit, after_prolog_fp, fsr, fi)
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register CORE_ADDR ip;
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register CORE_ADDR limit;
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CORE_ADDR after_prolog_fp;
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struct frame_saved_regs *fsr;
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struct frame_info *fi;
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{
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register CORE_ADDR next_ip;
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int r;
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int i;
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int have_fp = 0;
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register int src;
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register struct pic_prologue_code *pcode;
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INSN_WORD insn_word;
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int size, offset;
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/* Number of things pushed onto stack, starts at 2/4, 'cause the
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PC is already there */
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unsigned int reg_save_depth = h8300hmode ? 4 : 2;
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unsigned int auto_depth = 0; /* Number of bytes of autos */
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char in_frame[11]; /* One for each reg */
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memset (in_frame, 1, 11);
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for (r = 0; r < 8; r++)
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{
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fsr->regs[r] = 0;
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}
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if (after_prolog_fp == 0)
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{
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after_prolog_fp = read_register (SP_REGNUM);
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}
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if (ip == 0 || ip & (h8300hmode ? ~0xffff : ~0xffff))
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return 0;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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/* Skip over any fp push instructions */
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fsr->regs[6] = after_prolog_fp;
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while (next_ip && IS_PUSH_FP (insn_word))
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{
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ip = next_ip;
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in_frame[insn_word & 0x7] = reg_save_depth;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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reg_save_depth += 2;
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}
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/* Is this a move into the fp */
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if (next_ip && IS_MOV_SP_FP (insn_word))
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{
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ip = next_ip;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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have_fp = 1;
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}
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/* Skip over any stack adjustment, happens either with a number of
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sub#2,sp or a mov #x,r5 sub r5,sp */
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if (next_ip && IS_SUB2_SP (insn_word))
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{
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while (next_ip && IS_SUB2_SP (insn_word))
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{
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auto_depth += 2;
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ip = next_ip;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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}
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}
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else
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{
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if (next_ip && IS_MOVK_R5 (insn_word))
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{
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ip = next_ip;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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auto_depth += insn_word;
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next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn_word);
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auto_depth += insn_word;
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}
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}
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/* Work out which regs are stored where */
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while (next_ip && IS_PUSH (insn_word))
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{
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ip = next_ip;
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next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn_word);
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fsr->regs[r] = after_prolog_fp + auto_depth;
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auto_depth += 2;
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}
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/* The args are always reffed based from the stack pointer */
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fi->args_pointer = after_prolog_fp;
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/* Locals are always reffed based from the fp */
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fi->locals_pointer = after_prolog_fp;
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/* The PC is at a known place */
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fi->from_pc = read_memory_unsigned_integer (after_prolog_fp + 2, BINWORD);
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/* Rememeber any others too */
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in_frame[PC_REGNUM] = 0;
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if (have_fp)
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/* We keep the old FP in the SP spot */
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fsr->regs[SP_REGNUM] = read_memory_unsigned_integer (fsr->regs[6], BINWORD);
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else
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fsr->regs[SP_REGNUM] = after_prolog_fp + auto_depth;
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return (ip);
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}
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void
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init_extra_frame_info (fromleaf, fi)
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int fromleaf;
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struct frame_info *fi;
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{
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fi->fsr = 0; /* Not yet allocated */
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fi->args_pointer = 0; /* Unknown */
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fi->locals_pointer = 0; /* Unknown */
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fi->from_pc = 0;
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}
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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 frame->from_pc;
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}
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CORE_ADDR
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frame_locals_address (fi)
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struct frame_info *fi;
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{
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if (!fi->locals_pointer)
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{
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struct frame_saved_regs ignore;
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get_frame_saved_regs (fi, &ignore);
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}
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return fi->locals_pointer;
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}
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/* Return the address of the argument block for the frame
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described by FI. Returns 0 if the address is unknown. */
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CORE_ADDR
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frame_args_address (fi)
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struct frame_info *fi;
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{
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if (!fi->args_pointer)
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{
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struct frame_saved_regs ignore;
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get_frame_saved_regs (fi, &ignore);
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}
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return fi->args_pointer;
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}
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void
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h8300_pop_frame ()
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{
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unsigned regnum;
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struct frame_saved_regs fsr;
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struct frame_info *frame = get_current_frame ();
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get_frame_saved_regs (frame, &fsr);
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for (regnum = 0; regnum < 8; regnum++)
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{
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if (fsr.regs[regnum])
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write_register (regnum, read_memory_integer(fsr.regs[regnum]), BINWORD);
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flush_cached_frames ();
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}
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}
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struct cmd_list_element *setmemorylist;
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static void
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h8300_command(args, from_tty)
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{
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extern int h8300hmode;
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h8300hmode = 0;
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}
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static void
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h8300h_command(args, from_tty)
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{
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extern int h8300hmode;
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h8300hmode = 1;
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}
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static void
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set_machine (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 machine\" must be followed by h8300 or h8300h.\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_h8300m ()
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{
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add_prefix_cmd ("machine", no_class, set_machine,
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"set the machine type", &setmemorylist, "set machine ", 0,
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&setlist);
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add_cmd ("h8300", class_support, h8300_command,
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"Set machine to be H8/300.", &setmemorylist);
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add_cmd ("h8300h", class_support, h8300h_command,
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"Set machine to be H8/300H.", &setmemorylist);
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}
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void
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print_register_hook (regno)
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{
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if (regno == 8)
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{
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/* CCR register */
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int C, Z, N, V;
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unsigned char b[4];
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unsigned char l;
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read_relative_register_raw_bytes (regno, b);
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l = b[REGISTER_VIRTUAL_SIZE(8) -1];
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printf_unfiltered ("\t");
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printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
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printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
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N = (l & 0x8) != 0;
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Z = (l & 0x4) != 0;
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V = (l & 0x2) != 0;
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C = (l & 0x1) != 0;
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printf_unfiltered ("N-%d ", N);
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printf_unfiltered ("Z-%d ", Z);
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printf_unfiltered ("V-%d ", V);
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printf_unfiltered ("C-%d ", C);
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if ((C | Z) == 0)
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printf_unfiltered ("u> ");
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if ((C | Z) == 1)
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printf_unfiltered ("u<= ");
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if ((C == 0))
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printf_unfiltered ("u>= ");
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if (C == 1)
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printf_unfiltered ("u< ");
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if (Z == 0)
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printf_unfiltered ("!= ");
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if (Z == 1)
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printf_unfiltered ("== ");
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if ((N ^ V) == 0)
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printf_unfiltered (">= ");
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if ((N ^ V) == 1)
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printf_unfiltered ("< ");
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if ((Z | (N ^ V)) == 0)
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printf_unfiltered ("> ");
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if ((Z | (N ^ V)) == 1)
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printf_unfiltered ("<= ");
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}
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}
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void
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_initialize_h8300_tdep ()
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{
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tm_print_insn = gdb_print_insn_h8300;
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}
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