Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 392 insertions, 0 deletions

diff --git a/gdb/i386v-nat.c b/gdb/i386v-nat.c
new file mode 100644
index 0000000..5618687
--- /dev/null
+++ b/gdb/i386v-nat.c
@@ -0,0 +1,392 @@
+/* Intel 386 native support for SYSV systems (pre-SVR4).
+   Copyright (C) 1988, 89, 91, 92, 94, 96, 1998 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"
+
+#ifdef HAVE_PTRACE_H
+# include <ptrace.h>
+#else
+# ifdef HAVE_SYS_PTRACE_H
+#  include <sys/ptrace.h>
+# endif
+#endif
+
+#include "frame.h"
+#include "inferior.h"
+#include "language.h"
+#include "gdbcore.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+
+/* FIXME: The following used to be just "#include <sys/debugreg.h>", but
+ * the the Linux 2.1.x kernel and glibc 2.0.x are not in sync; including
+ * <sys/debugreg.h> will result in an error.  With luck, these losers
+ * will get their act together and we can trash this hack in the near future.
+ * --jsm 1998-10-21
+ */
+
+#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
+# ifdef HAVE_ASM_DEBUGREG_H
+#  include <asm/debugreg.h>
+# else
+#  include <sys/debugreg.h>
+# endif
+#endif
+
+#include <sys/file.h>
+#include "gdb_stat.h"
+
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
+#include "floatformat.h"
+
+#include "target.h"
+
+
+/* this table must line up with REGISTER_NAMES in tm-i386v.h */
+/* symbols like 'EAX' come from <sys/reg.h> */
+static int regmap[] = 
+{
+  EAX, ECX, EDX, EBX,
+  UESP, EBP, ESI, EDI,
+  EIP, EFL, CS, SS,
+  DS, ES, FS, GS,
+};
+
+/* blockend is the value of u.u_ar0, and points to the
+ * place where GS is stored
+ */
+
+int
+i386_register_u_addr (blockend, regnum)
+     int blockend;
+     int regnum;
+{
+  struct user u;
+  int fpstate;
+  int ubase;
+
+  ubase = blockend;
+  /* FIXME:  Should have better way to test floating point range */
+  if (regnum >= FP0_REGNUM && regnum <= (FP0_REGNUM + 7)) 
+    {
+#ifdef KSTKSZ	/* SCO, and others? */
+      ubase += 4 * (SS + 1) - KSTKSZ;
+      fpstate = ubase + ((char *)&u.u_fps.u_fpstate - (char *)&u);
+      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
+#else
+      fpstate = ubase + ((char *)&u.i387.st_space - (char *)&u);
+      return (fpstate + 10 * (regnum - FP0_REGNUM));
+#endif
+    } 
+  else
+    {
+      return (ubase + 4 * regmap[regnum]);
+    }
+  
+}
+
+int
+kernel_u_size ()
+{
+  return (sizeof (struct user));
+}
+
+#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
+
+#if !defined (offsetof)
+#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+#endif
+
+/* Record the value of the debug control register.  */
+static int debug_control_mirror;
+
+/* Record which address associates with which register.  */
+static CORE_ADDR address_lookup[DR_LASTADDR - DR_FIRSTADDR + 1];
+
+static int
+i386_insert_aligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
+					   int));
+
+static int
+i386_insert_nonaligned_watchpoint PARAMS ((int, CORE_ADDR, CORE_ADDR, int,
+					   int));
+
+/* Insert a watchpoint.  */
+
+int
+i386_insert_watchpoint (pid, addr, len, rw)
+     int pid;
+     CORE_ADDR addr;
+     int len;
+     int rw;
+{
+  return i386_insert_aligned_watchpoint (pid, addr, addr, len, rw);
+}
+
+static int
+i386_insert_aligned_watchpoint (pid, waddr, addr, len, rw)
+     int pid;
+     CORE_ADDR waddr;
+     CORE_ADDR addr;
+     int len;
+     int rw;
+{
+  int i;
+  int read_write_bits, len_bits;
+  int free_debug_register;
+  int register_number;
+  
+  /* Look for a free debug register.  */
+  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+    {
+      if (address_lookup[i - DR_FIRSTADDR] == 0)
+	break;
+    }
+
+  /* No more debug registers!  */
+  if (i > DR_LASTADDR)
+    return -1;
+
+  read_write_bits = (rw & 1) ? DR_RW_READ : DR_RW_WRITE;
+
+  if (len == 1)
+    len_bits = DR_LEN_1;
+  else if (len == 2)
+    {
+      if (addr % 2)
+	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+      len_bits = DR_LEN_2;
+    }
+
+  else if (len == 4)
+    {
+      if (addr % 4)
+	return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+      len_bits = DR_LEN_4;
+    }
+  else
+    return i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw);
+  
+  free_debug_register = i;
+  register_number = free_debug_register - DR_FIRSTADDR;
+  debug_control_mirror |=
+    ((read_write_bits | len_bits)
+     << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * register_number));
+  debug_control_mirror |=
+    (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
+  debug_control_mirror |= DR_LOCAL_SLOWDOWN;
+  debug_control_mirror &= ~DR_CONTROL_RESERVED;
+  
+  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
+	  debug_control_mirror);
+  ptrace (6, pid, offsetof (struct user, u_debugreg[free_debug_register]),
+	  addr);
+
+  /* Record where we came from.  */
+  address_lookup[register_number] = addr;
+  return 0;
+}
+
+static int
+i386_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw)
+     int pid;
+     CORE_ADDR waddr;
+     CORE_ADDR addr;
+     int len;
+     int rw;
+{
+  int align;
+  int size;
+  int rv;
+
+  static int size_try_array[16] = {
+    1, 1, 1, 1,			/* trying size one */
+    2, 1, 2, 1,			/* trying size two */
+    2, 1, 2, 1,			/* trying size three */
+    4, 1, 2, 1			/* trying size four */
+  };
+
+  rv = 0;
+  while (len > 0)
+    {
+      align = addr % 4;
+      /* Four is the maximum length for 386.  */
+      size = (len > 4) ? 3 : len - 1;
+      size = size_try_array[size * 4 + align];
+
+      rv = i386_insert_aligned_watchpoint (pid, waddr, addr, size, rw);
+      if (rv)
+	{
+	  i386_remove_watchpoint (pid, waddr, size);
+	  return rv;
+	}
+      addr += size;
+      len -= size;
+    }
+  return rv;
+}
+
+/* Remove a watchpoint.  */
+
+int
+i386_remove_watchpoint (pid, addr, len)
+     int pid;
+     CORE_ADDR addr;
+     int len;
+{
+  int i;
+  int register_number;
+
+  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+    {
+      register_number = i - DR_FIRSTADDR;
+      if (address_lookup[register_number] == addr)
+	{
+	  debug_control_mirror &=
+	    ~(1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * register_number));
+	  address_lookup[register_number] = 0;
+	}
+    }
+  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_CONTROL]),
+	  debug_control_mirror);
+  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
+
+  return 0;
+}
+
+/* Check if stopped by a watchpoint.  */
+
+CORE_ADDR
+i386_stopped_by_watchpoint (pid)
+    int pid;
+{
+  int i;
+  int status;
+
+  status = ptrace (3, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
+  ptrace (6, pid, offsetof (struct user, u_debugreg[DR_STATUS]), 0);
+
+  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+    {
+      if (status & (1 << (i - DR_FIRSTADDR)))
+	return address_lookup[i - DR_FIRSTADDR];
+    }
+
+  return 0;
+}
+
+#endif /* TARGET_HAS_HARDWARE_WATCHPOINTS */
+
+#if 0
+/* using FLOAT_INFO as is would be a problem.  FLOAT_INFO is called
+   via a command xxx and eventually calls ptrace without ever having
+   traversed the target vector.  This would be terribly impolite
+   behaviour for a sun4 hosted remote gdb.
+
+   A fix might be to move this code into the "info registers" command.
+   rich@cygnus.com 15 Sept 92. */
+i386_float_info ()
+{
+  struct user u; /* just for address computations */
+  int i;
+  /* fpstate defined in <sys/user.h> */
+  struct fpstate *fpstatep;
+  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
+  unsigned int uaddr;
+  char fpvalid = 0;
+  unsigned int rounded_addr;
+  unsigned int rounded_size;
+  extern int corechan;
+  int skip;
+  
+  uaddr = (char *)&u.u_fpvalid - (char *)&u;
+  if (target_has_execution)
+    {
+      unsigned int data;
+      unsigned int mask;
+      
+      rounded_addr = uaddr & -sizeof (int);
+      data = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
+      mask = 0xff << ((uaddr - rounded_addr) * 8);
+      
+      fpvalid = ((data & mask) != 0);
+    } 
+#if 0
+  else 
+    {
+      if (lseek (corechan, uaddr, 0) < 0)
+	perror ("seek on core file");
+      if (myread (corechan, &fpvalid, 1) < 0) 
+	perror ("read on core file");
+      
+    }
+#endif	/* no core support yet */
+  
+  if (fpvalid == 0) 
+    {
+      printf_unfiltered ("no floating point status saved\n");
+      return;
+    }
+  
+  uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
+  if (target_has_execution)
+    {
+      int *ip;
+      
+      rounded_addr = uaddr & -sizeof (int);
+      rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
+		      sizeof (int) - 1) / sizeof (int);
+      skip = uaddr - rounded_addr;
+      
+      ip = (int *)buf;
+      for (i = 0; i < rounded_size; i++) 
+	{
+	  *ip++ = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) rounded_addr, 0);
+	  rounded_addr += sizeof (int);
+	}
+    } 
+#if 0
+  else 
+    {
+      if (lseek (corechan, uaddr, 0) < 0)
+	perror_with_name ("seek on core file");
+      if (myread (corechan, buf, sizeof (struct fpstate)) < 0) 
+	perror_with_name ("read from core file");
+      skip = 0;
+    }
+#endif	/* 0 */ 
+
+  fpstatep = (struct fpstate *)(buf + skip);
+  print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
+}
+
+#endif /* never */