* arc-tdep.c: new target dependent codes for arc processor.

        * remote-arc.c: new file for arc-specific protocol through
        parallel line.
        * ser-go32-para.c: new file for go32 parallel port communication.
        * .Sanitize: sanitize arc specific files out.

1 files changed, 361 insertions, 0 deletions

diff --git a/gdb/arc-tdep.c b/gdb/arc-tdep.c
new file mode 100644
index 0000000000..8bea234003
--- /dev/null
+++ b/gdb/arc-tdep.c
@@ -0,0 +1,361 @@
+/* ARC target-dependent stuff.
+   Copyright (C) 1995 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.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "floatformat.h"
+#include "symtab.h"
+
+static void codestream_read PARAMS ((unsigned int *, int));
+static void codestream_seek PARAMS ((int));
+static unsigned int codestream_fill PARAMS ((int));
+
+#define CODESTREAM_BUFSIZ 16 
+static CORE_ADDR codestream_next_addr;
+static CORE_ADDR codestream_addr;
+static unsigned int codestream_buf[CODESTREAM_BUFSIZ];
+static int codestream_off;
+static int codestream_cnt;
+
+#define codestream_tell() (codestream_addr + codestream_off)
+#define codestream_peek() (codestream_cnt == 0 ? \
+			   codestream_fill(1): codestream_buf[codestream_off])
+#define codestream_get() (codestream_cnt-- == 0 ? \
+			 codestream_fill(0) : codestream_buf[codestream_off++])
+#define OPMASK	0xf8000000
+
+static unsigned int 
+codestream_fill (peek_flag)
+    int peek_flag;
+{
+  codestream_addr = codestream_next_addr;
+  codestream_next_addr += CODESTREAM_BUFSIZ;
+  codestream_off = 0;
+  codestream_cnt = CODESTREAM_BUFSIZ;
+  read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ);
+  
+  if (peek_flag)
+    return (codestream_peek());
+  else
+    return (codestream_get());
+}
+
+static void
+codestream_seek (place)
+    int place;
+{
+  codestream_next_addr = place / CODESTREAM_BUFSIZ;
+  codestream_next_addr *= CODESTREAM_BUFSIZ;
+  codestream_cnt = 0;
+  codestream_fill (1);
+  while (codestream_tell() != place)
+    codestream_get ();
+}
+
+static void
+codestream_read (buf, count)
+     unsigned int *buf;
+     int count;
+{
+  unsigned int *p;
+  int i;
+  p = buf;
+  for (i = 0; i < count; i++)
+    *p++ = codestream_get ();
+}
+
+/*
+ * find & return amound a local space allocated, and advance codestream to
+ * first register push (if any)
+ * if entry sequence doesn't make sense, return -1, and leave 
+ * codestream pointer random
+ */
+
+static long
+arc_get_frame_setup (pc)
+     int pc;
+{
+  unsigned int insn, n;
+
+  codestream_seek (pc);
+  insn = codestream_get ();
+
+  if (insn & OPMASK == 0x10000000)		/* st fp,[sp] */
+    {	
+      insn = codestream_get ();
+      if (insn & OPMASK != 0x10000000)	        /* st blink,[sp,4] */
+	{
+	  if (insn & OPMASK != 0x60000000)      /* for leaf, no st blink */
+	    return -1;
+	}
+      else if (codestream_get () & OPMASK != 0x60000000)    /* mov fp,sp */
+	return (-1);
+
+      /* check for stack adjustment sub sp,nnn,sp */
+      insn = codestream_peek ();
+      if (insn & OPMASK == 0x50000000)
+	{
+	  n = (insn & 0x000001ff ); 
+          codestream_get ();
+
+	  /* this sequence is used to get the address of the return
+	   * buffer for a function that returns a structure
+	   */
+	  insn = codestream_peek ();
+	  if (insn & OPMASK == 0x60000000)
+	    codestream_get ();
+
+	  return n;
+	}
+      else
+	{
+	  return (0);
+	}
+    }
+  return (-1);
+}
+
+/* return pc of first real instruction */
+CORE_ADDR
+skip_prologue (pc)
+     int pc;
+{
+  unsigned int insn;
+  int i;
+  CORE_ADDR pos;
+  
+  if (arc_get_frame_setup (pc) < 0)
+    return (pc);
+  
+  /* skip over register saves */
+  for (i = 0; i < 10; i++)
+    {
+      insn = codestream_peek ();
+      if (insn & OPMASK != 0x10000000)       /* break if not st inst */
+	break;
+      codestream_get ();
+    }
+     
+  codestream_seek (pos);
+  return (codestream_tell ());
+}
+
+/* Return number of args passed to a frame.
+   Can return -1, meaning no way to tell.  */
+int
+frame_num_args (fi)
+     struct frame_info *fi;
+{
+#if 1
+  return -1;
+#else
+  /* This loses because not only might the compiler not be popping the
+     args right after the function call, it might be popping args from both
+     this call and a previous one, and we would say there are more args
+     than there really are.  Is it true for ARC */
+
+  int retpc;						
+  unsigned char op;					
+  struct frame_info *pfi;
+
+  int frameless;
+
+  FRAMELESS_FUNCTION_INVOCATION (fi, frameless);
+  if (frameless)
+    /* In the absence of a frame pointer, GDB doesn't get correct values
+       for nameless arguments.  Return -1, so it doesn't print any
+       nameless arguments.  */
+    return -1;
+
+  pfi = get_prev_frame_info (fi);			
+  if (pfi == 0)
+    {
+      /* Note:  this can happen if we are looking at the frame for
+	 main, because FRAME_CHAIN_VALID won't let us go into
+	 start.  If we have debugging symbols, that's not really
+	 a big deal; it just means it will only show as many arguments
+	 to main as are declared.  */
+      return -1;
+    }
+  else
+    {
+      retpc = pfi->pc;					
+      op = read_memory_integer (retpc, 1);			
+      if (op == 0x59)					
+	/* pop %ecx */			       
+	return 1;				
+	}
+      else
+	{
+	  return 0;
+	}
+    }
+#endif
+}
+
+/*
+ * parse the first few instructions of the function to see
+ * what registers were stored.
+ *
+ * The startup sequence can be at the start of the function.
+ * 'st fp,[sp], st blink,[sp+4], mov fp,sp' 
+ *
+ * Local space is allocated just below by sub sp,nnn,sp
+ * Next, the registers used by this function are stored.
+ */
+
+void
+frame_find_saved_regs (fip, fsrp)
+     struct frame_info *fip;
+     struct frame_saved_regs *fsrp;
+{
+  long locals;
+  unsigned int insn;
+  CORE_ADDR dummy_bottom;
+  CORE_ADDR adr;
+  int i, regnum, offset;
+  
+  memset (fsrp, 0, sizeof *fsrp);
+  
+  /* if frame is the end of a dummy, compute where the
+   * beginning would be
+   */
+  dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH;
+  
+  /* check if the PC is in the stack, in a dummy frame */
+  if (dummy_bottom <= fip->pc && fip->pc <= fip->frame) 
+    {
+      /* all regs were saved by push_call_dummy () */
+      adr = fip->frame;
+      for (i = 0; i < NUM_REGS; i++) 
+	{
+	  adr -= REGISTER_RAW_SIZE (i);
+	  fsrp->regs[i] = adr;
+	}
+      return;
+    }
+  
+  locals = arc_get_frame_setup (get_pc_function_start (fip->pc));
+  
+  if (locals >= 0) 
+    {
+      adr = fip->frame - locals;
+      for (i = 0; i < 10; i++) 
+	{
+	  insn = codestream_get ();
+	  if (insn & 0xffff8000 != 0x100d8000)
+	    break;
+          regnum = (insn & 0x00007c00) >> 9;
+	  offset = (insn << 23) >> 23;
+	  fsrp->regs[regnum] = adr + offset;
+	}
+    }
+  
+  fsrp->regs[PC_REGNUM] = fip->frame + 4;
+  fsrp->regs[FP_REGNUM] = fip->frame;
+}
+
+void
+push_dummy_frame ()
+{
+  CORE_ADDR sp = read_register (SP_REGNUM);
+  int regnum;
+  char regbuf[MAX_REGISTER_RAW_SIZE];
+
+  read_register_gen (PC_REGNUM, regbuf);
+  write_memory (sp+4, regbuf, REGISTER_SIZE);
+  read_register_gen (FP_REGNUM, regbuf);
+  write_memory (sp, regbuf, REGISTER_SIZE);
+  write_register (FP_REGNUM, sp);
+  for (regnum = 0; regnum < NUM_REGS; regnum++)
+    {
+      read_register_gen (regnum, regbuf);
+      sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum));
+    }
+  sp += (2*REGISTER_SIZE);
+  write_register (SP_REGNUM, sp);
+}
+
+void
+pop_frame ()
+{
+  struct frame_info *frame = get_current_frame ();
+  CORE_ADDR fp;
+  int regnum;
+  struct frame_saved_regs fsr;
+  char regbuf[MAX_REGISTER_RAW_SIZE];
+  
+  fp = FRAME_FP (frame);
+  get_frame_saved_regs (frame, &fsr);
+  for (regnum = 0; regnum < NUM_REGS; regnum++) 
+    {
+      CORE_ADDR adr;
+      adr = fsr.regs[regnum];
+      if (adr)
+	{
+	  read_memory (adr, regbuf, REGISTER_RAW_SIZE (regnum));
+	  write_register_bytes (REGISTER_BYTE (regnum), regbuf,
+				REGISTER_RAW_SIZE (regnum));
+	}
+    }
+  write_register (FP_REGNUM, read_memory_integer (fp, 4));
+  write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
+  write_register (SP_REGNUM, fp + 8);
+  flush_cached_frames ();
+}
+
+#ifdef GET_LONGJMP_TARGET
+/* Figure out where the longjmp will land.  Slurp the args out of the stack.
+   We expect the first arg to be a pointer to the jmp_buf structure from which
+   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
+   This routine returns true on success. */
+
+int
+get_longjmp_target(pc)
+     CORE_ADDR *pc;
+{
+  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+  CORE_ADDR sp, jb_addr;
+
+  sp = read_register (SP_REGNUM);
+
+  if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
+			  buf,
+			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
+    return 0;
+
+  jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
+			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
+    return 0;
+
+  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+  return 1;
+}
+#endif /* GET_LONGJMP_TARGET */
+
+void _initialize_arc_tdep ()
+{
+  tm_print_insn = print_insn_arc;
+}