Initial revision

1 files changed, 353 insertions, 0 deletions

diff --git a/gdb/ns32knbsd-nat.c b/gdb/ns32knbsd-nat.c
new file mode 100644
index 00000000000..c9f75cac87f
--- /dev/null
+++ b/gdb/ns32knbsd-nat.c
@@ -0,0 +1,353 @@
+/* Functions specific to running gdb native on an ns32k running NetBSD
+   Copyright 1989, 1992, 1993, 1994, 1996 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 <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+
+#include "defs.h"
+#include "inferior.h"
+#include "target.h"
+#include "gdbcore.h"
+
+#define RF(dst, src) \
+	memcpy(&registers[REGISTER_BYTE(dst)], &src, sizeof(src))
+
+#define RS(src, dst) \
+	memcpy(&dst, &registers[REGISTER_BYTE(src)], sizeof(dst))
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  struct reg inferior_registers;
+  struct fpreg inferior_fpregisters;
+
+  ptrace (PT_GETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+  ptrace (PT_GETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fpregisters, 0);
+
+  RF(R0_REGNUM + 0, inferior_registers.r_r0);
+  RF(R0_REGNUM + 1, inferior_registers.r_r1);
+  RF(R0_REGNUM + 2, inferior_registers.r_r2);
+  RF(R0_REGNUM + 3, inferior_registers.r_r3);
+  RF(R0_REGNUM + 4, inferior_registers.r_r4);
+  RF(R0_REGNUM + 5, inferior_registers.r_r5);
+  RF(R0_REGNUM + 6, inferior_registers.r_r6);
+  RF(R0_REGNUM + 7, inferior_registers.r_r7);
+
+  RF(SP_REGNUM	  , inferior_registers.r_sp);
+  RF(FP_REGNUM	  , inferior_registers.r_fp);
+  RF(PC_REGNUM	  , inferior_registers.r_pc);
+  RF(PS_REGNUM	  , inferior_registers.r_psr);
+
+  RF(FPS_REGNUM   , inferior_fpregisters.r_fsr);
+  RF(FP0_REGNUM +0, inferior_fpregisters.r_freg[0]);
+  RF(FP0_REGNUM +2, inferior_fpregisters.r_freg[2]);
+  RF(FP0_REGNUM +4, inferior_fpregisters.r_freg[4]);
+  RF(FP0_REGNUM +6, inferior_fpregisters.r_freg[6]);
+  RF(LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
+  RF(LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
+  RF(LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
+  RF(LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
+   registers_fetched ();
+}
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  struct reg inferior_registers;
+  struct fpreg inferior_fpregisters;
+
+  RS(R0_REGNUM + 0, inferior_registers.r_r0);
+  RS(R0_REGNUM + 1, inferior_registers.r_r1);
+  RS(R0_REGNUM + 2, inferior_registers.r_r2);
+  RS(R0_REGNUM + 3, inferior_registers.r_r3);
+  RS(R0_REGNUM + 4, inferior_registers.r_r4);
+  RS(R0_REGNUM + 5, inferior_registers.r_r5);
+  RS(R0_REGNUM + 6, inferior_registers.r_r6);
+  RS(R0_REGNUM + 7, inferior_registers.r_r7);
+
+  RS(SP_REGNUM	  , inferior_registers.r_sp);
+  RS(FP_REGNUM	  , inferior_registers.r_fp);
+  RS(PC_REGNUM	  , inferior_registers.r_pc);
+  RS(PS_REGNUM	  , inferior_registers.r_psr);
+
+  RS(FPS_REGNUM   , inferior_fpregisters.r_fsr);
+  RS(FP0_REGNUM +0, inferior_fpregisters.r_freg[0]);
+  RS(FP0_REGNUM +2, inferior_fpregisters.r_freg[2]);
+  RS(FP0_REGNUM +4, inferior_fpregisters.r_freg[4]);
+  RS(FP0_REGNUM +6, inferior_fpregisters.r_freg[6]);
+  RS(LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
+  RS(LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
+  RS(LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
+  RS(LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
+
+  ptrace (PT_SETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
+  ptrace (PT_SETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fpregisters, 0);
+}
+
+
+/* XXX - Add this to machine/regs.h instead? */
+struct coreregs {
+  struct reg intreg;
+  struct fpreg freg;
+};
+
+/* Get registers from a core file. */
+static 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 */
+{
+  struct coreregs *core_reg;
+
+  core_reg = (struct coreregs *)core_reg_sect;
+
+  /*
+   * We have *all* registers
+   * in the first core section.
+   * Ignore which.
+   */
+
+  if (core_reg_size < sizeof(*core_reg)) {
+    fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
+    return;
+  }
+
+  /* Integer registers */
+  RF(R0_REGNUM + 0, core_reg->intreg.r_r0);
+  RF(R0_REGNUM + 1, core_reg->intreg.r_r1);
+  RF(R0_REGNUM + 2, core_reg->intreg.r_r2);
+  RF(R0_REGNUM + 3, core_reg->intreg.r_r3);
+  RF(R0_REGNUM + 4, core_reg->intreg.r_r4);
+  RF(R0_REGNUM + 5, core_reg->intreg.r_r5);
+  RF(R0_REGNUM + 6, core_reg->intreg.r_r6);
+  RF(R0_REGNUM + 7, core_reg->intreg.r_r7);
+
+  RF(SP_REGNUM	  , core_reg->intreg.r_sp);
+  RF(FP_REGNUM	  , core_reg->intreg.r_fp);
+  RF(PC_REGNUM	  , core_reg->intreg.r_pc);
+  RF(PS_REGNUM	  , core_reg->intreg.r_psr);
+
+  /* Floating point registers */
+  RF(FPS_REGNUM   , core_reg->freg.r_fsr);
+  RF(FP0_REGNUM +0, core_reg->freg.r_freg[0]);
+  RF(FP0_REGNUM +2, core_reg->freg.r_freg[2]);
+  RF(FP0_REGNUM +4, core_reg->freg.r_freg[4]);
+  RF(FP0_REGNUM +6, core_reg->freg.r_freg[6]);
+  RF(LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
+  RF(LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
+  RF(LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
+  RF(LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
+  registers_fetched ();
+}
+
+/* Register that we are able to handle ns32knbsd core file formats.
+   FIXME: is this really bfd_target_unknown_flavour? */
+
+static struct core_fns nat_core_fns =
+{
+  bfd_target_unknown_flavour,
+  fetch_core_registers,
+  NULL
+};
+
+void
+_initialize_ns32knbsd_nat ()
+{
+  add_core_fns (&nat_core_fns);
+}
+
+
+/*
+ * kernel_u_size() is not helpful on NetBSD because
+ * the "u" struct is NOT in the core dump file.
+ */
+
+#ifdef	FETCH_KCORE_REGISTERS
+/*
+ * Get registers from a kernel crash dump or live kernel.
+ * Called by kcore-nbsd.c:get_kcore_registers().
+ */
+void
+fetch_kcore_registers (pcb)
+     struct pcb *pcb;
+{
+  struct switchframe sf;
+  struct reg intreg;
+  int dummy;
+
+  /* Integer registers */
+  if (target_read_memory((CORE_ADDR)pcb->pcb_ksp, (char *)&sf, sizeof sf))
+     error("Cannot read integer registers.");
+
+  /* We use the psr at kernel entry */
+  if (target_read_memory((CORE_ADDR)pcb->pcb_onstack, (char *)&intreg, sizeof intreg))
+     error("Cannot read processor status register.");
+
+  dummy = 0;
+  RF(R0_REGNUM + 0, dummy);
+  RF(R0_REGNUM + 1, dummy);
+  RF(R0_REGNUM + 2, dummy);
+  RF(R0_REGNUM + 3, sf.sf_r3);
+  RF(R0_REGNUM + 4, sf.sf_r4);
+  RF(R0_REGNUM + 5, sf.sf_r5);
+  RF(R0_REGNUM + 6, sf.sf_r6);
+  RF(R0_REGNUM + 7, sf.sf_r7);
+
+  dummy = pcb->pcb_kfp + 8;
+  RF(SP_REGNUM	  , dummy);
+  RF(FP_REGNUM	  , sf.sf_fp);
+  RF(PC_REGNUM	  , sf.sf_pc);
+  RF(PS_REGNUM	  , intreg.r_psr);
+
+  /* Floating point registers */
+  RF(FPS_REGNUM   , pcb->pcb_fsr);
+  RF(FP0_REGNUM +0, pcb->pcb_freg[0]);
+  RF(FP0_REGNUM +2, pcb->pcb_freg[2]);
+  RF(FP0_REGNUM +4, pcb->pcb_freg[4]);
+  RF(FP0_REGNUM +6, pcb->pcb_freg[6]);
+  RF(LP0_REGNUM + 1, pcb->pcb_freg[1]);
+  RF(LP0_REGNUM + 3, pcb->pcb_freg[3]);
+  RF(LP0_REGNUM + 5, pcb->pcb_freg[5]);
+  RF(LP0_REGNUM + 7, pcb->pcb_freg[7]);
+  registers_fetched ();
+}
+#endif	/* FETCH_KCORE_REGISTERS */
+
+void
+clear_regs()
+{
+  double zero = 0.0;
+  int null = 0;
+  
+  /* Integer registers */
+  RF(R0_REGNUM + 0, null);
+  RF(R0_REGNUM + 1, null);
+  RF(R0_REGNUM + 2, null);
+  RF(R0_REGNUM + 3, null);
+  RF(R0_REGNUM + 4, null);
+  RF(R0_REGNUM + 5, null);
+  RF(R0_REGNUM + 6, null);
+  RF(R0_REGNUM + 7, null);
+
+  RF(SP_REGNUM	  , null);
+  RF(FP_REGNUM	  , null);
+  RF(PC_REGNUM	  , null);
+  RF(PS_REGNUM	  , null);
+
+  /* Floating point registers */
+  RF(FPS_REGNUM   , zero);
+  RF(FP0_REGNUM +0, zero);
+  RF(FP0_REGNUM +2, zero);
+  RF(FP0_REGNUM +4, zero);
+  RF(FP0_REGNUM +6, zero);
+  RF(LP0_REGNUM + 0, zero);
+  RF(LP0_REGNUM + 1, zero);
+  RF(LP0_REGNUM + 2, zero);
+  RF(LP0_REGNUM + 3, zero);
+  return;
+}
+
+/* Return number of args passed to a frame.
+   Can return -1, meaning no way to tell. */
+
+int
+frame_num_args(fi)
+struct frame_info *fi;
+{
+	CORE_ADDR	enter_addr;
+	CORE_ADDR	argp;
+	int		inst;
+	int		args;
+	int		i;
+
+	if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000) {
+		/* main is always called with three args */
+		return(3);
+	}
+	enter_addr = ns32k_get_enter_addr(fi->pc);
+	if (enter_addr = 0)
+		return(-1);
+	argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL(fi) : FRAME_SAVED_PC(fi);
+	for (i = 0; i < 16; i++) {
+		/*
+		 * After a bsr gcc may emit the following instructions
+		 * to remove the arguments from the stack:
+		 *   cmpqd 0,tos 	- to remove 4 bytes from the stack
+		 *   cmpd tos,tos	- to remove 8 bytes from the stack
+		 *   adjsp[bwd] -n	- to remove n bytes from the stack
+		 * Gcc sometimes delays emitting these instructions and
+		 * may even throw a branch between our feet.
+		 */		 
+		inst = read_memory_integer(argp    , 4);
+		args = read_memory_integer(argp + 2, 4);
+		if ((inst & 0xff) == 0xea) {		/* br */
+			args = ((inst >> 8) & 0xffffff) | (args << 24);
+			if (args & 0x80) {
+				if (args & 0x40) {
+					args = ntohl(args);
+				} else {
+					args = ntohs(args & 0xffff);
+					if (args & 0x2000)
+						args |= 0xc000;
+				}
+			} else {
+				args = args & 0xff;
+				if (args & 0x40)
+					args |= 0x80;
+			}
+			argp += args;
+			continue;
+		}
+		if ((inst & 0xffff) == 0xb81f)		/* cmpqd 0,tos */
+			return(1);
+		else if ((inst & 0xffff) == 0xbdc7)	/* cmpd tos,tos */
+			return(2);
+		else if ((inst & 0xfffc) == 0xa57c) {	/* adjsp[bwd] */
+			switch (inst & 3) {
+			case 0:
+				args = ((args & 0xff) + 0x80);
+				break;
+			case 1:
+				args = ((ntohs(args) & 0xffff) + 0x8000);
+				break;
+			case 3:
+				args = -ntohl(args);
+				break;
+			default:
+				return(-1);
+			}
+			if (args / 4 > 10 || (args & 3) != 0)
+				continue;
+			return(args / 4);
+		}
+		argp += 1;
+	}
+	return(-1);
+}