Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 215 insertions, 0 deletions

diff --git a/gdb/hppab-nat.c b/gdb/hppab-nat.c
new file mode 100644
index 0000000..52ce1fd
--- /dev/null
+++ b/gdb/hppab-nat.c
@@ -0,0 +1,215 @@
+/* Machine-dependent hooks for the unix child process stratum.  This
+   code is for the HP PA-RISC cpu.
+
+   Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+
+   Contributed by the Center for Software Science at the
+   University of Utah (pa-gdb-bugs@cs.utah.edu).
+
+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 "inferior.h"
+#include "target.h"
+#include <sys/ptrace.h>
+
+/* Use an extra level of indirection for ptrace calls.
+   This lets us breakpoint usefully on call_ptrace.   It also
+   allows us to pass an extra argument to ptrace without
+   using an ANSI-C specific macro.  */
+
+#define ptrace call_ptrace
+
+#if !defined (offsetof)
+#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+#endif
+
+/* U_REGS_OFFSET is the offset of the registers within the u area.  */
+#if !defined (U_REGS_OFFSET)
+#define U_REGS_OFFSET \
+  ptrace (PT_READ_U, inferior_pid, \
+          (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
+    - KERNEL_U_ADDR
+#endif
+
+/* Fetch one register.  */
+
+static void
+fetch_register (regno)
+     int regno;
+{
+  register unsigned int regaddr;
+  char buf[MAX_REGISTER_RAW_SIZE];
+  register int i;
+
+  /* Offset of registers within the u area.  */
+  unsigned int offset;
+
+  offset = U_REGS_OFFSET;
+
+  regaddr = register_addr (regno, offset);
+  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+    {
+      errno = 0;
+      *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
+				 (PTRACE_ARG3_TYPE) regaddr, 0);
+      regaddr += sizeof (int);
+      if (errno != 0)
+	{
+	  /* Warning, not error, in case we are attached; sometimes the
+	     kernel doesn't let us at the registers.  */
+	  char *err = safe_strerror (errno);
+	  char *msg = alloca (strlen (err) + 128);
+	  sprintf (msg, "reading register %s: %s", REGISTER_NAME (regno), err);
+	  warning (msg);
+	  goto error_exit;
+	}
+    }
+  supply_register (regno, buf);
+ error_exit:;
+}
+
+/* Fetch all registers, or just one, from the child process.  */
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  if (regno == -1)
+    for (regno = 0; regno < NUM_REGS; regno++)
+      fetch_register (regno);
+  else
+    fetch_register (regno);
+}
+
+/* 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];
+  extern char registers[];
+  register int i;
+  unsigned int offset = U_REGS_OFFSET;
+  int scratch;
+
+  if (regno >= 0)
+    {
+      if (CANNOT_STORE_REGISTER (regno))
+	return;
+      regaddr = register_addr (regno, offset);
+      errno = 0;
+      if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
+        {
+          scratch = *(int *) &registers[REGISTER_BYTE (regno)] | 0x3;
+          ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+                  scratch);
+          if (errno != 0)
+            {
+	      /* Error, even if attached.  Failing to write these two
+		 registers is pretty serious.  */
+              sprintf (buf, "writing register number %d", regno);
+              perror_with_name (buf);
+            }
+        }
+      else
+	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
+	  {
+	    errno = 0;
+	    ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+		    *(int *) &registers[REGISTER_BYTE (regno) + i]);
+	    if (errno != 0)
+	      {
+		/* Warning, not error, in case we are attached; sometimes the
+		   kernel doesn't let us at the registers.  */
+		char *err = safe_strerror (errno);
+		char *msg = alloca (strlen (err) + 128);
+		sprintf (msg, "writing register %s: %s",
+			 REGISTER_NAME (regno), err);
+		warning (msg);
+		return;
+	      }
+	    regaddr += sizeof(int);
+	  }
+    }
+  else
+    for (regno = 0; regno < NUM_REGS; regno++)
+      store_inferior_registers (regno);
+}
+
+/* PT_PROT is specific to the PA BSD kernel and isn't documented
+   anywhere (except here).  
+
+   PT_PROT allows one to enable/disable the data memory break bit
+   for pages of memory in an inferior process.  This bit is used
+   to cause "Data memory break traps" to occur when the appropriate
+   page is written to.
+
+   The arguments are as follows:
+
+      PT_PROT -- The ptrace action to perform.
+
+      INFERIOR_PID -- The pid of the process who's page table entries
+      will be modified.
+
+      PT_ARGS -- The *address* of a 3 word block of memory which has
+      additional information:
+
+        word 0 -- The start address to watch.  This should be a page-aligned
+	address.
+
+	word 1 -- The ending address to watch.  Again, this should be a 
+	page aligned address.
+
+	word 2 -- Nonzero to enable the data memory break bit on the
+	given address range or zero to disable the data memory break
+	bit on the given address range.
+
+  This call may fail if the given addresses are not valid in the inferior
+  process.  This most often happens when restarting a program which
+  as watchpoints inserted on heap or stack memory.  */
+	
+#define PT_PROT 21
+
+int
+hppa_set_watchpoint (addr, len, flag)
+     int addr, len, flag;
+{
+  int pt_args[3];
+  pt_args[0] = addr;
+  pt_args[1] = addr + len;
+  pt_args[2] = flag;
+
+  /* Mask off the lower 12 bits since we want to work on a page basis.  */
+  pt_args[0] >>= 12; 
+  pt_args[1] >>= 12; 
+
+  /* Rounding adjustments.  */
+  pt_args[1] -= pt_args[0]; 
+  pt_args[1]++; 
+
+  /* Put the lower 12 bits back as zero.  */
+  pt_args[0] <<= 12; 
+  pt_args[1] <<= 12; 
+
+  /* Do it.  */
+  return ptrace (PT_PROT, inferior_pid, (PTRACE_ARG3_TYPE) pt_args, 0);
+}