sun386 host/target/native separation

1 files changed, 276 insertions, 0 deletions

diff --git a/gdb/sun386-nat.c b/gdb/sun386-nat.c
new file mode 100644
index 0000000000..f843eae955
--- /dev/null
+++ b/gdb/sun386-nat.c
@@ -0,0 +1,276 @@
+/* Native support for Sun 386i's for GDB, the GNU debugger.
+   Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
+   Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
+   C2V Paris, April 89.
+
+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.  */
+
+#if defined (GDB_TARGET_IS_SUN386)
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/core.h>
+
+
+/* Machine-dependent code which would otherwise be in core.c */
+/* Work with core files, for GDB. */
+
+
+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 inferior with \"kill\".");
+      corechan = open (filename, O_RDONLY, 0);
+      if (corechan < 0)
+	perror_with_name (filename);
+
+      {
+	struct core corestr;
+
+	val = myread (corechan, &corestr, sizeof corestr);
+	if (val < 0)
+	  perror_with_name (filename);
+	if (corestr.c_magic != CORE_MAGIC)
+	  error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
+		 filename, corestr.c_magic, (int) CORE_MAGIC);
+	else if (sizeof (struct core) != corestr.c_len)
+	  error ("\"%s\" has an invalid struct core length (%d, expected %d)",
+		 filename, corestr.c_len, (int) sizeof (struct core));
+
+	data_start = exec_data_start;
+	data_end = data_start + corestr.c_dsize;
+	stack_start = stack_end - corestr.c_ssize;
+	data_offset = sizeof corestr;
+	stack_offset = sizeof corestr + corestr.c_dsize;
+
+	bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
+
+	bcopy (corestr.c_fpu.f_fpstatus.f_st,
+	       &registers[REGISTER_BYTE (FP0_REGNUM)],
+	       sizeof corestr.c_fpu.f_fpstatus.f_st);
+	bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
+	       &registers[REGISTER_BYTE (FPC_REGNUM)],
+	       sizeof corestr.c_fpu.f_fpstatus -
+	       sizeof corestr.c_fpu.f_fpstatus.f_st);
+
+	/* the struct aouthdr of sun coff is not the struct exec stored
+	   in the core file. */
+	bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
+#ifndef COFF_ENCAPSULATE
+	core_aouthdr.magic = corestr.c_aouthdr.a_info;
+	core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
+#endif
+	printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
+	if (corestr.c_signo > 0)
+	  printf ("Program terminated with signal %d, %s.\n",
+		  corestr.c_signo, safe_strsignal (corestr.c_signo));
+      }
+      if (filename[0] == '/')
+	corefile = savestring (filename, strlen (filename));
+      else
+	{
+	  corefile = concat (current_directory, "/", filename, NULL);
+	}
+
+      set_current_frame ( create_new_frame (read_register (FP_REGNUM),
+					    read_pc ()));
+      select_frame (get_current_frame (), 0);
+
+      validate_files ();
+    }
+  else if (from_tty)
+    printf ("No core file now.\n");
+}
+
+i387_to_double (from, to)
+     char *from;
+     char *to;
+{
+  long *lp;
+  /* push extended mode on 387 stack, then pop in double mode
+   *
+   * first, set exception masks so no error is generated -
+   * number will be rounded to inf or 0, if necessary 
+   */
+  asm ("pushl %eax"); 		/* grab a stack slot */
+  asm ("fstcw (%esp)");		/* get 387 control word */
+  asm ("movl (%esp),%eax");	/* save old value */
+  asm ("orl $0x3f,%eax");		/* mask all exceptions */
+  asm ("pushl %eax");
+  asm ("fldcw (%esp)");		/* load new value into 387 */
+  
+  asm ("movl 8(%ebp),%eax");
+  asm ("fldt (%eax)");		/* push extended number on 387 stack */
+  asm ("fwait");
+  asm ("movl 12(%ebp),%eax");
+  asm ("fstpl (%eax)");		/* pop double */
+  asm ("fwait");
+  
+  asm ("popl %eax");		/* flush modified control word */
+  asm ("fnclex");			/* clear exceptions */
+  asm ("fldcw (%esp)");		/* restore original control word */
+  asm ("popl %eax");		/* flush saved copy */
+}
+
+double_to_i387 (from, to)
+     char *from;
+     char *to;
+{
+  /* push double mode on 387 stack, then pop in extended mode
+   * no errors are possible because every 64-bit pattern
+   * can be converted to an extended
+   */
+  asm ("movl 8(%ebp),%eax");
+  asm ("fldl (%eax)");
+  asm ("fwait");
+  asm ("movl 12(%ebp),%eax");
+  asm ("fstpt (%eax)");
+  asm ("fwait");
+}
+#else /* Not sun386 target.  */
+
+/* These functions shouldn't be called when we're cross-debugging.  */
+
+/* ARGSUSED */
+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 */
+{
+}
+
+#endif /* Not sun386 target.  */
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  struct regs inferior_registers;
+  struct fp_state inferior_fp_registers;
+  extern char registers[];
+
+  registers_fetched ();
+
+  ptrace (PTRACE_GETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers);
+  ptrace (PTRACE_GETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+
+  bcopy (&inferior_registers, registers, sizeof inferior_registers);
+
+  bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
+	 sizeof inferior_fp_registers.f_st);
+  bcopy (&inferior_fp_registers.f_ctrl,
+	 &registers[REGISTER_BYTE (FPC_REGNUM)],
+	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+}
+
+/* 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;
+{
+  struct regs inferior_registers;
+  struct fp_state inferior_fp_registers;
+  extern char registers[];
+
+  bcopy (registers, &inferior_registers, 20 * 4);
+
+  bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
+	 sizeof inferior_fp_registers.f_st);
+  bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
+	 &inferior_fp_registers.f_ctrl,
+	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+  
+#ifdef PTRACE_FP_BUG
+  if (regno == FP_REGNUM || regno == -1)
+    /* Storing the frame pointer requires a gross hack, in which an
+       instruction that moves eax into ebp gets single-stepped.  */
+    {
+      int stack = inferior_registers.r_reg[SP_REGNUM];
+      int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
+			  (PTRACE_ARG3_TYPE) stack);
+      int reg = inferior_registers.r_reg[EAX];
+      inferior_registers.r_reg[EAX] =
+	inferior_registers.r_reg[FP_REGNUM];
+      ptrace (PTRACE_SETREGS, inferior_pid, 
+	      (PTRACE_ARG3_TYPE) &inferior_registers);
+      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+	      0xc589);
+      ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+	      0);
+      wait (0);
+      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
+	      stuff);
+      inferior_registers.r_reg[EAX] = reg;
+    }
+#endif
+  ptrace (PTRACE_SETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers);
+  ptrace (PTRACE_SETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+}
+