Initial revision

1 files changed, 406 insertions, 0 deletions

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
new file mode 100644
index 0000000..b4fe1b5
--- /dev/null
+++ b/gdb/arm-tdep.c
@@ -0,0 +1,406 @@
+/* Copyright (C) 1988, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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 1, or (at your option)
+any later version.
+
+GDB 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 GDB; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "defs.h"
+#include "param.h"
+#include "frame.h"
+#include "inferior.h"
+#include "arm-opcode.h"
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#define N_TXTADDR(hdr) 0x8000
+#define N_DATADDR(hdr) (hdr.a_text + 0x8000)
+
+#include "gdbcore.h"
+#include <sys/user.h>		/* After a.out.h  */
+#include <sys/file.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+
+
+/* Work with core dump and executable files, for GDB. 
+   This code would be in core.c if it weren't machine-dependent. */
+
+/* Structure to describe the chain of shared libraries used
+   by the execfile.
+   e.g. prog shares Xt which shares X11 which shares c. */
+
+struct shared_library {
+    struct exec_header header;
+    char name[SHLIBLEN];
+    CORE_ADDR text_start;	/* CORE_ADDR of 1st byte of text, this file */
+    long data_offset;		/* offset of data section in file */
+    int chan;			/* file descriptor for the file */
+    struct shared_library *shares; /* library this one shares */
+};
+static struct shared_library *shlib = 0;
+
+/* Hook for `exec_file_command' command to call.  */
+
+extern void (*exec_file_display_hook) ();
+   
+static CORE_ADDR unshared_text_start;
+
+/* extended header from exec file (for shared library info) */
+
+static struct exec_header exec_header;
+
+void
+exec_file_command (filename, from_tty)
+     char *filename;
+     int from_tty;
+{
+  int val;
+
+  /* Eliminate all traces of old exec file.
+     Mark text segment as empty.  */
+
+  if (execfile)
+    free (execfile);
+  execfile = 0;
+  data_start = 0;
+  data_end -= exec_data_start;
+  text_start = 0;
+  unshared_text_start = 0;
+  text_end = 0;
+  exec_data_start = 0;
+  exec_data_end = 0;
+  if (execchan >= 0)
+    close (execchan);
+  execchan = -1;
+  if (shlib) {
+      close_shared_library(shlib);
+      shlib = 0;
+  }
+
+  /* Now open and digest the file the user requested, if any.  */
+
+  if (filename)
+    {
+      filename = tilde_expand (filename);
+      make_cleanup (free, filename);
+
+      execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
+			&execfile);
+      if (execchan < 0)
+	perror_with_name (filename);
+
+      {
+	struct stat st_exec;
+
+#ifdef HEADER_SEEK_FD
+	HEADER_SEEK_FD (execchan);
+#endif
+	
+	val = myread (execchan, &exec_header, sizeof exec_header);
+	exec_aouthdr = exec_header.a_exec;
+
+	if (val < 0)
+	  perror_with_name (filename);
+
+	text_start = 0x8000;
+
+	/* Look for shared library if needed */
+	if (exec_header.a_exec.a_magic & MF_USES_SL)
+	    shlib = open_shared_library(exec_header.a_shlibname, text_start);
+
+	text_offset = N_TXTOFF (exec_aouthdr);
+	exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text;
+
+	if (shlib) {
+	    unshared_text_start = shared_text_end(shlib) & ~0x7fff;
+	    stack_start = shlib->header.a_exec.a_sldatabase;
+	    stack_end = STACK_END_ADDR;
+	} else
+	    unshared_text_start = 0x8000;
+	text_end = unshared_text_start + exec_aouthdr.a_text;
+
+	exec_data_start = unshared_text_start + exec_aouthdr.a_text;
+        exec_data_end = exec_data_start + exec_aouthdr.a_data;
+
+	data_start = exec_data_start;
+	data_end += exec_data_start;
+
+	fstat (execchan, &st_exec);
+	exec_mtime = st_exec.st_mtime;
+      }
+
+      validate_files ();
+    }
+  else if (from_tty)
+    printf ("No exec file now.\n");
+
+  /* Tell display code (if any) about the changed file name.  */
+  if (exec_file_display_hook)
+    (*exec_file_display_hook) (filename);
+}
+
+/* Read from the program's memory (except for inferior processes).
+   This function is misnamed, since it only reads, never writes; and
+   since it will use the core file and/or executable file as necessary.
+
+   It should be extended to write as well as read, FIXME, for patching files.
+
+   Return 0 if address could be read, EIO if addresss out of bounds.  */
+
+int
+xfer_core_file (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  register int i;
+  register int val;
+  int xferchan;
+  char **xferfile;
+  int fileptr;
+  int returnval = 0;
+
+  while (len > 0)
+    {
+      xferfile = 0;
+      xferchan = 0;
+
+      /* Determine which file the next bunch of addresses reside in,
+	 and where in the file.  Set the file's read/write pointer
+	 to point at the proper place for the desired address
+	 and set xferfile and xferchan for the correct file.
+
+	 If desired address is nonexistent, leave them zero.
+
+	 i is set to the number of bytes that can be handled
+	 along with the next address.
+
+	 We put the most likely tests first for efficiency.  */
+
+      /* Note that if there is no core file
+	 data_start and data_end are equal.  */
+      if (memaddr >= data_start && memaddr < data_end)
+	{
+	  i = min (len, data_end - memaddr);
+	  fileptr = memaddr - data_start + data_offset;
+	  xferfile = &corefile;
+	  xferchan = corechan;
+	}
+      /* Note that if there is no core file
+	 stack_start and stack_end define the shared library data.  */
+      else if (memaddr >= stack_start && memaddr < stack_end)
+	{
+	    if (corechan < 0) {
+		struct shared_library *lib;
+		for (lib = shlib; lib; lib = lib->shares)
+		    if (memaddr >= lib->header.a_exec.a_sldatabase &&
+			memaddr < lib->header.a_exec.a_sldatabase +
+			  lib->header.a_exec.a_data)
+			break;
+		if (lib) {
+		    i = min (len, lib->header.a_exec.a_sldatabase +
+			     lib->header.a_exec.a_data - memaddr);
+		    fileptr = lib->data_offset + memaddr -
+			lib->header.a_exec.a_sldatabase;
+		    xferfile = execfile;
+		    xferchan = lib->chan;
+		}
+	    } else {
+		i = min (len, stack_end - memaddr);
+		fileptr = memaddr - stack_start + stack_offset;
+		xferfile = &corefile;
+		xferchan = corechan;
+	    }
+	}
+      else if (corechan < 0
+	       && memaddr >= exec_data_start && memaddr < exec_data_end)
+	{
+	  i = min (len, exec_data_end - memaddr);
+	  fileptr = memaddr - exec_data_start + exec_data_offset;
+	  xferfile = &execfile;
+	  xferchan = execchan;
+	}
+      else if (memaddr >= text_start && memaddr < text_end)
+	{
+	    struct shared_library *lib;
+	    for (lib = shlib; lib; lib = lib->shares)
+		if (memaddr >= lib->text_start &&
+		    memaddr < lib->text_start + lib->header.a_exec.a_text)
+		    break;
+	    if (lib) {
+		i = min (len, lib->header.a_exec.a_text +
+			 lib->text_start - memaddr);
+		fileptr = memaddr - lib->text_start + text_offset;
+		xferfile = &execfile;
+		xferchan = lib->chan;
+	    } else {
+		i = min (len, text_end - memaddr);
+		fileptr = memaddr - unshared_text_start + text_offset;
+		xferfile = &execfile;
+		xferchan = execchan;
+	    }
+	}
+      else if (memaddr < text_start)
+	{
+	  i = min (len, text_start - memaddr);
+	}
+      else if (memaddr >= text_end
+	       && memaddr < (corechan >= 0? data_start : exec_data_start))
+	{
+	  i = min (len, data_start - memaddr);
+	}
+      else if (corechan >= 0
+	       && memaddr >= data_end && memaddr < stack_start)
+	{
+	  i = min (len, stack_start - memaddr);
+	}
+      else if (corechan < 0 && memaddr >= exec_data_end)
+	{
+	  i = min (len, - memaddr);
+	}
+      else if (memaddr >= stack_end && stack_end != 0)
+	{
+	  i = min (len, - memaddr);
+	}
+      else
+	{
+	  /* Address did not classify into one of the known ranges.
+	     This shouldn't happen; we catch the endpoints.  */
+	  fatal ("Internal: Bad case logic in xfer_core_file.");
+	}
+
+      /* Now we know which file to use.
+	 Set up its pointer and transfer the data.  */
+      if (xferfile)
+	{
+	  if (*xferfile == 0)
+	    if (xferfile == &execfile)
+	      error ("No program file to examine.");
+	    else
+	      error ("No core dump file or running program to examine.");
+	  val = lseek (xferchan, fileptr, 0);
+	  if (val < 0)
+	    perror_with_name (*xferfile);
+	  val = myread (xferchan, myaddr, i);
+	  if (val < 0)
+	    perror_with_name (*xferfile);
+	}
+      /* If this address is for nonexistent memory,
+	 read zeros if reading, or do nothing if writing.
+	 Actually, we never right.  */
+      else
+	{
+	  bzero (myaddr, i);
+	  returnval = EIO;
+	}
+
+      memaddr += i;
+      myaddr += i;
+      len -= i;
+    }
+  return returnval;
+}
+
+/* APCS (ARM procedure call standard) defines the following prologue:
+
+   mov		ip, sp
+  [stmfd	sp!, {a1,a2,a3,a4}]
+   stmfd	sp!, {...,fp,ip,lr,pc}
+  [stfe		f7, [sp, #-12]!]
+  [stfe		f6, [sp, #-12]!]
+  [stfe		f5, [sp, #-12]!]
+  [stfe		f4, [sp, #-12]!]
+   sub		fp, ip, #nn	// nn == 20 or 4 depending on second ins
+*/
+
+CORE_ADDR
+skip_prologue(pc)
+CORE_ADDR pc;
+{
+    union insn_fmt op;
+    CORE_ADDR skip_pc = pc;
+
+    op.ins = read_memory_integer(skip_pc, 4);
+    /* look for the "mov ip,sp" */
+    if (op.generic.type != TYPE_ARITHMETIC ||
+	op.arith.opcode != OPCODE_MOV ||
+	op.arith.dest != SPTEMP ||
+	op.arith.operand2 != SP) return pc;
+    skip_pc += 4;
+    /* skip the "stmfd sp!,{a1,a2,a3,a4}" if its there */
+    op.ins = read_memory_integer(skip_pc, 4);
+    if (op.generic.type == TYPE_BLOCK_BRANCH &&
+	op.generic.subtype == SUBTYPE_BLOCK &&
+	op.block.mask == 0xf &&
+	op.block.base == SP &&
+	op.block.is_load == 0 &&
+	op.block.writeback == 1 &&
+	op.block.increment == 0 &&
+	op.block.before == 1) skip_pc += 4;
+    /* skip the "stmfd sp!,{...,fp,ip,lr,pc} */
+    op.ins = read_memory_integer(skip_pc, 4);
+    if (op.generic.type != TYPE_BLOCK_BRANCH ||
+	op.generic.subtype != SUBTYPE_BLOCK ||
+	/* the mask should look like 110110xxxxxx0000 */
+	(op.block.mask & 0xd800) != 0xd800 ||
+	op.block.base != SP ||
+	op.block.is_load != 0 ||
+	op.block.writeback != 1 ||
+	op.block.increment != 0 ||
+	op.block.before != 1) return pc;
+    skip_pc += 4;
+    /* check for "sub fp,ip,#nn" */
+    op.ins = read_memory_integer(skip_pc, 4);
+    if (op.generic.type != TYPE_ARITHMETIC ||
+	op.arith.opcode != OPCODE_SUB ||
+	op.arith.dest != FP ||
+	op.arith.operand1 != SPTEMP) return pc;
+    return skip_pc + 4;
+}
+
+static void
+print_fpu_flags(flags)
+int flags;
+{
+    if (flags & (1 << 0)) fputs("IVO ", stdout);
+    if (flags & (1 << 1)) fputs("DVZ ", stdout);
+    if (flags & (1 << 2)) fputs("OFL ", stdout);
+    if (flags & (1 << 3)) fputs("UFL ", stdout);
+    if (flags & (1 << 4)) fputs("INX ", stdout);
+    putchar('\n');
+}
+
+void
+arm_float_info()
+{
+    register unsigned long status = read_register(FPS_REGNUM);
+    int type;
+
+    type = (status >> 24) & 127;
+    printf("%s FPU type %d\n",
+	   (status & (1<<31)) ? "Hardware" : "Software",
+	   type);
+    fputs("mask: ", stdout);
+    print_fpu_flags(status >> 16);
+    fputs("flags: ", stdout);
+    print_fpu_flags(status);
+}