Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 559 insertions, 0 deletions

diff --git a/gdb/arm-xdep.c b/gdb/arm-xdep.c
new file mode 100644
index 0000000..f0d806e
--- /dev/null
+++ b/gdb/arm-xdep.c
@@ -0,0 +1,559 @@
+/* Acorn Risc Machine host machine support.
+   Copyright (C) 1988, 1989, 1991 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "arm-opcode.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 "gdb_stat.h"
+
+#include <errno.h>
+
+void
+fetch_inferior_registers (regno)
+     int regno;		/* Original value discarded */
+{
+  register unsigned int regaddr;
+  char buf[MAX_REGISTER_RAW_SIZE];
+  register int i;
+
+  struct user u;
+  unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
+  offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
+      - KERNEL_U_ADDR;
+
+  registers_fetched ();
+  
+  for (regno = 0; regno < 16; regno++)
+    {
+      regaddr = offset + regno * 4;
+      *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid,
+				(PTRACE_ARG3_TYPE) regaddr, 0);
+      if (regno == PC_REGNUM)
+	  *(int *)&buf[0] = GET_PC_PART(*(int *)&buf[0]);
+      supply_register (regno, buf);
+    }
+  *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid,
+			    (PTRACE_ARG3_TYPE) (offset + PC*4), 0);
+  supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */
+
+  /* read the floating point registers */
+  offset = (char *) &u.u_fp_regs - (char *)&u;
+  *(int *)buf = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0);
+  supply_register (FPS_REGNUM, buf);
+  for (regno = 16; regno < 24; regno++) {
+      regaddr = offset + 4 + 12 * (regno - 16);
+      for (i = 0; i < 12; i += sizeof(int))
+	  *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
+				     (PTRACE_ARG3_TYPE) (regaddr + i), 0);
+      supply_register (regno, buf);
+  }
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  register unsigned int regaddr;
+  char buf[80];
+
+  struct user u;
+  unsigned long value;
+  unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
+  offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
+      - KERNEL_U_ADDR;
+
+  if (regno >= 0) {
+      if (regno >= 16) return;
+      regaddr = offset + 4 * regno;
+      errno = 0;
+      value = read_register(regno);
+      if (regno == PC_REGNUM)
+	  value = SET_PC_PART(read_register (PS_REGNUM), value);
+      ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
+      if (errno != 0)
+	{
+	  sprintf (buf, "writing register number %d", regno);
+	  perror_with_name (buf);
+	}
+    }
+  else for (regno = 0; regno < 15; regno++)
+    {
+      regaddr = offset + regno * 4;
+      errno = 0;
+      value = read_register(regno);
+      if (regno == PC_REGNUM)
+	  value = SET_PC_PART(read_register (PS_REGNUM), value);
+      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
+      if (errno != 0)
+	{
+	  sprintf (buf, "writing all regs, number %d", regno);
+	  perror_with_name (buf);
+	}
+    }
+}
+
+/* Work with core dump and executable files, for GDB. 
+   This code would be in corefile.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
+core_file_command (filename, from_tty)
+     char *filename;
+     int from_tty;
+{
+  int val;
+  extern char registers[];
+
+  /* Discard all vestiges of any previous core file
+     and mark data and stack spaces as empty.  */
+
+  if (corefile)
+    free (corefile);
+  corefile = 0;
+
+  if (corechan >= 0)
+    close (corechan);
+  corechan = -1;
+
+  data_start = 0;
+  data_end = 0;
+  stack_start = STACK_END_ADDR;
+  stack_end = STACK_END_ADDR;
+
+  /* Now, if a new core file was specified, open it and digest it.  */
+
+  if (filename)
+    {
+      filename = tilde_expand (filename);
+      make_cleanup (free, filename);
+      
+      if (have_inferior_p ())
+	error ("To look at a core file, you must kill the program with \"kill\".");
+      corechan = open (filename, O_RDONLY, 0);
+      if (corechan < 0)
+	perror_with_name (filename);
+      /* 4.2-style (and perhaps also sysV-style) core dump file.  */
+      {
+	struct user u;
+
+	unsigned int reg_offset, fp_reg_offset;
+
+	val = myread (corechan, &u, sizeof u);
+	if (val < 0)
+	  perror_with_name ("Not a core file: reading upage");
+	if (val != sizeof u)
+	  error ("Not a core file: could only read %d bytes", val);
+
+	/* We are depending on exec_file_command having been called
+	   previously to set exec_data_start.  Since the executable
+	   and the core file share the same text segment, the address
+	   of the data segment will be the same in both.  */
+	data_start = exec_data_start;
+
+	data_end = data_start + NBPG * u.u_dsize;
+	stack_start = stack_end - NBPG * u.u_ssize;
+	data_offset = NBPG * UPAGES;
+	stack_offset = NBPG * (UPAGES + u.u_dsize);
+
+	/* Some machines put an absolute address in here and some put
+	   the offset in the upage of the regs.  */
+	reg_offset = (int) u.u_ar0;
+	if (reg_offset > NBPG * UPAGES)
+	  reg_offset -= KERNEL_U_ADDR;
+	fp_reg_offset = (char *) &u.u_fp_regs - (char *)&u;
+
+	/* I don't know where to find this info.
+	   So, for now, mark it as not available.  */
+	N_SET_MAGIC (core_aouthdr, 0);
+
+	/* Read the register values out of the core file and store
+	   them where `read_register' will find them.  */
+
+	{
+	  register int regno;
+
+	  for (regno = 0; regno < NUM_REGS; regno++)
+	    {
+	      char buf[MAX_REGISTER_RAW_SIZE];
+
+	      if (regno < 16)
+		  val = lseek (corechan, reg_offset + 4 * regno, 0);
+	      else if (regno < 24)
+		  val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0);
+	      else if (regno == 24)
+		  val = lseek (corechan, fp_reg_offset, 0);
+	      else if (regno == 25)
+		  val = lseek (corechan, reg_offset + 4 * PC, 0);
+	      if (val < 0
+		  || (val = myread (corechan, buf, sizeof buf)) < 0)
+		{
+		  char * buffer = (char *) alloca (strlen (REGISTER_NAME (regno))
+						   + 30);
+		  strcpy (buffer, "Reading register ");
+		  strcat (buffer, REGISTER_NAME (regno));
+						   
+		  perror_with_name (buffer);
+		}
+
+	      if (regno == PC_REGNUM)
+		  *(int *)buf = GET_PC_PART(*(int *)buf);
+	      supply_register (regno, buf);
+	    }
+	}
+      }
+      if (filename[0] == '/')
+	corefile = savestring (filename, strlen (filename));
+      else
+	{
+	  corefile = concat (current_directory, "/", filename, NULL);
+	}
+
+      flush_cached_frames ();
+      select_frame (get_current_frame (), 0);
+      validate_files ();
+    }
+  else if (from_tty)
+    printf ("No core file now.\n");
+}
+
+#if 0
+/* Work with core dump and executable files, for GDB. 
+   This code would be in corefile.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 executable file now.\n");
+
+  /* Tell display code (if any) about the changed file name.  */
+  if (exec_file_display_hook)
+    (*exec_file_display_hook) (filename);
+}
+#endif
+
+#if 0
+/* 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
+	{
+	  memset (myaddr, '\0', i);
+	  returnval = EIO;
+	}
+
+      memaddr += i;
+      myaddr += i;
+      len -= i;
+    }
+  return returnval;
+}
+#endif