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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/ns32k-tdep.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/ns32k-tdep.c')
-rw-r--r--gdb/ns32k-tdep.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/gdb/ns32k-tdep.c b/gdb/ns32k-tdep.c
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+/* Print NS 32000 instructions for GDB, the GNU debugger.
+ Copyright 1986, 1988, 1991, 1992, 1994, 1995
+ 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"
+
+void
+_initialize_ns32k_tdep ()
+{
+ tm_print_insn = print_insn_ns32k;
+}
+
+sign_extend (value, bits)
+{
+ value = value & ((1 << bits) - 1);
+ return (value & (1 << (bits-1))
+ ? value | (~((1 << bits) - 1))
+ : value);
+}
+
+void
+flip_bytes (ptr, count)
+ char *ptr;
+ int count;
+{
+ char tmp;
+
+ while (count > 0)
+ {
+ tmp = *ptr;
+ ptr[0] = ptr[count-1];
+ ptr[count-1] = tmp;
+ ptr++;
+ count -= 2;
+ }
+}
+
+/* Return the number of locals in the current frame given a pc
+ pointing to the enter instruction. This is used in the macro
+ FRAME_FIND_SAVED_REGS. */
+
+int
+ns32k_localcount (enter_pc)
+ CORE_ADDR enter_pc;
+{
+ unsigned char localtype;
+ int localcount;
+
+ localtype = read_memory_integer (enter_pc+2, 1);
+ if ((localtype & 0x80) == 0)
+ localcount = localtype;
+ else if ((localtype & 0xc0) == 0x80)
+ localcount = (((localtype & 0x3f) << 8)
+ | (read_memory_integer (enter_pc+3, 1) & 0xff));
+ else
+ localcount = (((localtype & 0x3f) << 24)
+ | ((read_memory_integer (enter_pc+3, 1) & 0xff) << 16)
+ | ((read_memory_integer (enter_pc+4, 1) & 0xff) << 8 )
+ | (read_memory_integer (enter_pc+5, 1) & 0xff));
+ return localcount;
+}
+
+
+/* Nonzero if instruction at PC is a return instruction. */
+
+static int
+ns32k_about_to_return (pc)
+ CORE_ADDR pc;
+{
+ return (read_memory_integer (pc, 1) == 0x12);
+}
+
+
+/*
+ * Get the address of the enter opcode for the function
+ * containing PC, if there is an enter for the function,
+ * and if the pc is between the enter and exit.
+ * Returns positive address if pc is between enter/exit,
+ * 1 if pc before enter or after exit, 0 otherwise.
+ */
+
+CORE_ADDR
+ns32k_get_enter_addr (pc)
+ CORE_ADDR pc;
+{
+ CORE_ADDR enter_addr;
+ unsigned char op;
+
+ if (pc == 0)
+ return 0;
+
+ if (ns32k_about_to_return (pc))
+ return 1; /* after exit */
+
+ enter_addr = get_pc_function_start (pc);
+
+ if (pc == enter_addr)
+ return 1; /* before enter */
+
+ op = read_memory_integer (enter_addr, 1);
+
+ if (op != 0x82)
+ return 0; /* function has no enter/exit */
+
+ return enter_addr; /* pc is between enter and exit */
+}