Rs6000 native support.

* infptrace.c: remove #ifdef USG from around include ptrace.h.
  machines without this header should not be compiling this file.
* nm-rs6000.h, rs6000-nat.c: new files for native support.
* rs6000-tdep.c: do not include sys/ptrace.h or sys/reg.h.
* rs6000-xdep.c: removed.  all code now in rs6000-nat.c.
* xm-rs6000.h: do not include ptrace.h.
  (ATTACH_DETACH, FETCH_INFERIOR_REGISTERS): moved to nm-rs6000.h.
* config/rs6000.mh (XDEPFILES): removed rs6000-xdep.o.
  infptrace.o and inftarg.o move to NATDEPFIES.
  (NAT_FILE, NATDEPFILES): new macro for native support.

1 files changed, 249 insertions, 0 deletions

diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c
new file mode 100644
index 0000000000..e00ee5ceff
--- /dev/null
+++ b/gdb/rs6000-nat.c
@@ -0,0 +1,249 @@
+/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
+   Copyright 1986, 1987, 1989, 1991, 1992 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 "inferior.h"
+#include "target.h"
+#include "nm.h"
+
+#include <sys/ptrace.h>
+#include <sys/reg.h>
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <a.out.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/core.h>
+
+extern int errno;
+
+static void
+exec_one_dummy_insn PARAMS ((void));
+
+/* Conversion from gdb-to-system special purpose register numbers.. */
+
+static int special_regs[] = {
+  IAR,				/* PC_REGNUM	*/
+  MSR,				/* PS_REGNUM	*/
+  CR,				/* CR_REGNUM	*/
+  LR,				/* LR_REGNUM	*/
+  CTR,				/* CTR_REGNUM	*/
+  XER,				/* XER_REGNUM   */
+  MQ				/* MQ_REGNUM	*/
+};
+
+void
+fetch_inferior_registers (regno)
+  int regno;
+{
+  int ii;
+  extern char registers[];
+
+  if (regno < 0) {			/* for all registers */
+
+    /* read 32 general purpose registers. */
+
+    for (ii=0; ii < 32; ++ii)
+      *(int*)&registers[REGISTER_BYTE (ii)] = 
+	ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii, 0, 0);
+
+    /* read general purpose floating point registers. */
+
+    for (ii=0; ii < 32; ++ii)
+      ptrace (PT_READ_FPR, inferior_pid, 
+	(PTRACE_ARG3_TYPE) &registers [REGISTER_BYTE (FP0_REGNUM+ii)],
+	      FPR0+ii, 0);
+
+    /* read special registers. */
+    for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii)
+      *(int*)&registers[REGISTER_BYTE (FIRST_SP_REGNUM+ii)] = 
+	ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) special_regs[ii],
+		0, 0);
+
+    registers_fetched ();
+    return;
+  }
+
+  /* else an individual register is addressed. */
+
+  else if (regno < FP0_REGNUM) {		/* a GPR */
+    *(int*)&registers[REGISTER_BYTE (regno)] =
+	ptrace (PT_READ_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0, 0);
+  }
+  else if (regno <= FPLAST_REGNUM) {		/* a FPR */
+    ptrace (PT_READ_FPR, inferior_pid,
+	(PTRACE_ARG3_TYPE) &registers [REGISTER_BYTE (regno)],
+	    (regno-FP0_REGNUM+FPR0), 0);
+  }
+  else if (regno <= LAST_SP_REGNUM) {		/* a special register */
+    *(int*)&registers[REGISTER_BYTE (regno)] =
+	ptrace (PT_READ_GPR, inferior_pid,
+		(PTRACE_ARG3_TYPE) special_regs[regno-FIRST_SP_REGNUM], 0, 0);
+  }
+  else
+    fprintf (stderr, "gdb error: register no %d not implemented.\n", regno);
+
+  register_valid [regno] = 1;
+}
+
+/* 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;
+{
+  extern char registers[];
+
+  errno = 0;
+
+  if (regno == -1) {			/* for all registers..	*/
+      int ii;
+
+       /* execute one dummy instruction (which is a breakpoint) in inferior
+          process. So give kernel a chance to do internal house keeping.
+	  Otherwise the following ptrace(2) calls will mess up user stack
+	  since kernel will get confused about the bottom of the stack (%sp) */
+
+       exec_one_dummy_insn ();
+
+      /* write general purpose registers first! */
+      for ( ii=GPR0; ii<=GPR31; ++ii) {
+	ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) ii,
+		*(int*)&registers[REGISTER_BYTE (ii)], 0);
+	if ( errno ) { 
+	  perror ("ptrace write_gpr"); errno = 0;
+	}
+      }
+
+      /* write floating point registers now. */
+      for ( ii=0; ii < 32; ++ii) {
+	ptrace (PT_WRITE_FPR, inferior_pid, 
+		  (PTRACE_ARG3_TYPE) &registers[REGISTER_BYTE (FP0_REGNUM+ii)],
+		FPR0+ii, 0);
+        if ( errno ) {
+	  perror ("ptrace write_fpr"); errno = 0;
+        }
+      }
+
+      /* write special registers. */
+      for (ii=0; ii <= LAST_SP_REGNUM-FIRST_SP_REGNUM; ++ii) {
+        ptrace (PT_WRITE_GPR, inferior_pid,
+		(PTRACE_ARG3_TYPE) special_regs[ii],
+		*(int*)&registers[REGISTER_BYTE (FIRST_SP_REGNUM+ii)], 0);
+	if ( errno ) {
+	  perror ("ptrace write_gpr"); errno = 0;
+	}
+      }
+  }
+
+  /* else, a specific register number is given... */
+
+  else if (regno < FP0_REGNUM) {		/* a GPR */
+
+    ptrace (PT_WRITE_GPR, inferior_pid, (PTRACE_ARG3_TYPE) regno,
+		*(int*)&registers[REGISTER_BYTE (regno)], 0);
+  }
+
+  else if (regno <= FPLAST_REGNUM) {		/* a FPR */
+    ptrace (PT_WRITE_FPR, inferior_pid, 
+	    (PTRACE_ARG3_TYPE) &registers[REGISTER_BYTE (regno)],
+	    regno-FP0_REGNUM+FPR0, 0);
+  }
+
+  else if (regno <= LAST_SP_REGNUM) {		/* a special register */
+
+    ptrace (PT_WRITE_GPR, inferior_pid,
+	    (PTRACE_ARG3_TYPE) special_regs [regno-FIRST_SP_REGNUM],
+	    *(int*)&registers[REGISTER_BYTE (regno)], 0);
+  }
+
+  else
+    fprintf (stderr, "Gdb error: register no %d not implemented.\n", regno);
+
+  if ( errno ) {
+    perror ("ptrace write");  errno = 0;
+  }
+}
+
+/* Execute one dummy breakpoint instruction.  This way we give the kernel
+   a chance to do some housekeeping and update inferior's internal data,
+   including u_area. */
+static void
+exec_one_dummy_insn ()
+{
+#define	DUMMY_INSN_ADDR	(TEXT_SEGMENT_BASE)+0x200
+
+  unsigned long shadow;
+  unsigned int status, pid;
+
+  /* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We assume that
+     this address will never be executed again by the real code. */
+
+  target_insert_breakpoint (DUMMY_INSN_ADDR, &shadow);
+
+  errno = 0;
+  ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) DUMMY_INSN_ADDR, 0, 0);
+  if (errno)
+    perror ("pt_continue");
+
+  do {
+    pid = wait (&status);
+  } while (pid != inferior_pid);
+    
+  target_remove_breakpoint (DUMMY_INSN_ADDR, &shadow);
+}
+
+void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     unsigned int reg_addr;	/* Unused in this version */
+{
+  /* fetch GPRs and special registers from the first register section
+     in core bfd. */
+  if (which == 0) {
+
+    /* copy GPRs first. */
+    bcopy (core_reg_sect, registers, 32 * 4);
+
+    /* gdb's internal register template and bfd's register section layout
+       should share a common include file. FIXMEmgo */
+    /* then comes special registes. They are supposed to be in the same
+       order in gdb template and bfd `.reg' section. */
+    core_reg_sect += (32 * 4);
+    bcopy (core_reg_sect, &registers [REGISTER_BYTE (FIRST_SP_REGNUM)],
+    			(LAST_SP_REGNUM - FIRST_SP_REGNUM + 1) * 4);
+  }
+
+  /* fetch floating point registers from register section 2 in core bfd. */
+  else if (which == 2)
+    bcopy (core_reg_sect, &registers [REGISTER_BYTE (FP0_REGNUM)], 32 * 8);
+
+  else
+    fprintf (stderr, "Gdb error: unknown parameter to fetch_core_registers().\n");
+}