* remote-z8k.c, z8k-tdep.c: support for the Z8001 and Z8002.

	* parse.c (std_regs): Only declare if NO_STD_REGS is defined.

1 files changed, 378 insertions, 0 deletions

diff --git a/gdb/z8k-tdep.c b/gdb/z8k-tdep.c
new file mode 100644
index 0000000..852c0f0
--- /dev/null
+++ b/gdb/z8k-tdep.c
@@ -0,0 +1,378 @@
+/* Target-machine dependent code for Zilog Z8000, for GDB.
+   Copyright (C) 1992 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* 
+ Contributed by Steve Chamberlain
+                sac@cygnus.com 
+ */
+
+
+#include "defs.h"
+#include "frame.h"
+#include "obstack.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+
+
+/* Return the saved PC from this frame.
+
+   If the frame has a memory copy of SRP_REGNUM, use that.  If not,
+   just use the register SRP_REGNUM itself.  */
+
+CORE_ADDR
+frame_saved_pc (frame)
+FRAME frame;
+{
+  return ( read_memory_pointer(frame->frame+(BIG ? 4 : 2)));
+}
+
+#define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
+#define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
+#define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
+#define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
+#define IS_SUB2_SP(x) (x==0x1b87)
+#define IS_MOVK_R5(x) (x==0x7905)
+#define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
+#define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))
+
+
+/* work out how much local space is on the stack and 
+   return the pc pointing to the first push */
+
+static
+CORE_ADDR 
+skip_adjust(pc, size)
+CORE_ADDR pc;
+int *size;
+{
+  *size = 0;
+
+  if (IS_PUSH_FP(read_memory_short(pc))
+      && IS_MOV_SP_FP(read_memory_short(pc+2)))
+  {
+    /* This is a function with an explict frame pointer */
+    pc += 4;
+    *size += 2;			/* remember the frame pointer */
+  }
+
+  /* remember any stack adjustment */
+  if (IS_SUB_SP(read_memory_short(pc)))
+  {
+    *size += read_memory_short(pc+2);
+    pc += 4;
+  }
+  return pc;
+}
+
+
+int
+examine_frame(pc, regs, sp)
+CORE_ADDR pc;
+struct frame_saved_regs *regs;
+CORE_ADDR sp;
+{
+ int w = read_memory_short(pc);
+ int offset = 0;
+ int regno;
+
+
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+  regs->regs[regno] = 0;
+
+  while  (IS_PUSHW(w) || IS_PUSHL(w)) 
+  {
+    /* work out which register is being pushed to where */
+    if (IS_PUSHL(w)) 
+    {
+      regs->regs[w & 0xf] = offset;
+      regs->regs[(w & 0xf) + 1] = offset +2;
+      offset += 4;
+    }
+    else {
+      regs->regs[w & 0xf] = offset;
+      offset += 2;
+    }
+    pc += 2;
+    w = read_memory_short(pc);
+  }
+
+ if (IS_MOVE_FP(w)) 
+ {
+   /* We know the fp */
+
+ }
+ else if (IS_SUB_SP(w))
+ {
+   /* Subtracting a value from the sp, so were in a function
+      which needs stack space for locals, but has no fp.  We fake up
+      the values as if we had an fp */
+   regs->regs[FP_REGNUM] = sp;
+ }
+ else
+ {
+   /* This one didn't have an fp, we'll fake it up */
+   regs->regs[SP_REGNUM] = sp;
+ }
+ /* stack pointer contains address of next frame */
+/*  regs->regs[fp_regnum()] = fp;*/
+  regs->regs[SP_REGNUM] = sp;
+  return pc;
+}
+
+CORE_ADDR z8k_skip_prologue(start_pc)
+CORE_ADDR start_pc;
+{
+  struct frame_saved_regs dummy;
+  return examine_frame(start_pc, &dummy, 0);
+}
+
+CORE_ADDR addr_bits_remove(x)
+CORE_ADDR x;
+{
+  return x & PTR_MASK;
+}
+
+read_memory_pointer(x)
+CORE_ADDR x;
+{
+
+return read_memory_integer(ADDR_BITS_REMOVE(x), BIG ? 4 : 2);
+}
+
+FRAME_ADDR
+frame_chain (thisframe)
+     FRAME thisframe;
+{
+  if (thisframe->prev == 0) 
+  {
+    /* This is the top of the stack, let's get the sp for real */
+  }
+  if (!inside_entry_file ((thisframe)->pc))
+  {
+return     read_memory_pointer ((thisframe)->frame);
+  }
+
+  return 0;
+}
+
+init_frame_pc() { abort(); }
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.  */
+
+void get_frame_saved_regs(frame_info, frame_saved_regs) 
+     struct frame_info *frame_info;
+     struct frame_saved_regs *frame_saved_regs;
+
+{
+CORE_ADDR pc;
+int w;
+bzero(frame_saved_regs, sizeof(*frame_saved_regs));
+pc = get_pc_function_start(frame_info->pc);
+
+/* wander down the instruction stream */
+examine_frame(pc, frame_saved_regs, frame_info->frame);
+
+}
+
+
+extract_return_value(valtype, regbuf, valbuf)
+struct type *valtype;
+char regbuf[REGISTER_BYTES];
+char *valbuf;
+{ 
+  bcopy(regbuf + REGISTER_BYTE(2), valbuf, TYPE_LENGTH(valtype));
+}
+void z8k_push_dummy_frame() { abort(); }
+
+int print_insn(memaddr, stream)
+CORE_ADDR memaddr;
+FILE *stream;
+{
+  char temp[20];
+  read_memory (memaddr, temp, 20);
+  if (BIG) {
+    return print_insn_z8001(memaddr, temp, stream);
+  }
+  else {
+    return print_insn_z8002(memaddr, temp, stream);
+  }
+}
+
+void
+store_return_value()
+{
+abort();
+}
+void
+store_struct_return() { abort(); }
+
+
+
+/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
+   is not the address of a valid instruction, the address of the next
+   instruction beyond ADDR otherwise.  *PWORD1 receives the first word
+   of the instruction.*/
+
+
+CORE_ADDR
+NEXT_PROLOGUE_INSN(addr, lim, pword1)
+CORE_ADDR addr;
+CORE_ADDR lim;
+short *pword1;
+{
+  if (addr < lim+8)   
+  {
+    read_memory (addr, pword1, sizeof(*pword1));
+    SWAP_TARGET_AND_HOST (pword1, sizeof (short));
+    return addr + 2;
+  }
+
+  return 0;
+
+}
+
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.
+
+   We cache the result of doing this in the frame_cache_obstack, since
+   it is fairly expensive.  */
+
+void
+frame_find_saved_regs (fip, fsrp)
+     struct frame_info *fip;
+     struct frame_saved_regs *fsrp;
+{
+  int locals;
+  CORE_ADDR pc;
+  CORE_ADDR adr;
+  int i;
+  
+  memset (fsrp, 0, sizeof *fsrp);
+
+  pc = skip_adjust(get_pc_function_start (fip->pc), &locals);
+
+ {
+   adr = fip->frame - locals;
+   for (i = 0; i < 8; i++) 
+   {
+     int word = read_memory_short(pc);
+     pc += 2 ;
+     if (IS_PUSHL(word)) {
+       fsrp->regs[word & 0xf] = adr;
+       fsrp->regs[(word & 0xf) + 1] = adr - 2;
+       adr -= 4;
+     }
+     else if (IS_PUSHW(word)) {
+       fsrp->regs[word & 0xf] = adr;
+       adr -= 2;
+     }
+     else
+      break;
+   }
+
+ }
+  
+  fsrp->regs[PC_REGNUM] = fip->frame + 4;
+  fsrp->regs[FP_REGNUM] = fip->frame;
+
+}
+
+void
+addr_bits_set() { abort(); }
+
+int
+saved_pc_after_call() 
+{ 
+  return addr_bits_remove(read_memory_integer(read_register(SP_REGNUM), PTR_SIZE));
+}
+
+void
+print_register_hook(regno)
+int regno;
+{
+
+  if ((regno & 1)==0 && regno < 16) 
+  {
+    unsigned    short l[2];
+    read_relative_register_raw_bytes(regno, (char *)(l+0));
+    read_relative_register_raw_bytes(regno+1, (char *)(l+1));
+    printf("\t");
+    printf("%04x%04x", l[0],l[1]);
+  }
+
+  if ((regno & 3)== 0 && regno < 16)
+  {
+    unsigned    short l[4];
+    read_relative_register_raw_bytes(regno, l+0);
+    read_relative_register_raw_bytes(regno+1, l+1);
+    read_relative_register_raw_bytes(regno+2, l+2);
+    read_relative_register_raw_bytes(regno+3, l+3);
+
+    printf("\t");
+    printf("%04x%04x%04x%04x", l[0],l[1],l[2],l[3]);
+  }
+  if (regno == 15) 
+  {
+    unsigned    short  rval;
+    int i;
+    read_relative_register_raw_bytes(regno, (char *)(&rval));
+
+    printf("\n");
+    for (i = 0; i < 10; i+=2)   {
+      printf("(sp+%d=%04x)",i, read_memory_short(rval+i));
+    }
+  }
+  
+}
+
+
+void
+register_convert_to_virtual(regnum, from, to) 
+unsigned char *from;
+unsigned char *to;
+{
+    to[0] = from[0];
+    to[1] = from[1];
+    to[2] = from[2];
+    to[3] = from[3];
+}
+
+void
+register_convert_to_raw(regnum, to, from) 
+char *to;
+char *from;
+{
+    to[0] = from[0];
+    to[1] = from[1];
+    to[2] = from[2];
+    to[3] = from[3];
+}
+
+
+
+void z8k_pop_frame() {  }