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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/h8500-tdep.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
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Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/h8500-tdep.c')
-rw-r--r--gdb/h8500-tdep.c653
1 files changed, 653 insertions, 0 deletions
diff --git a/gdb/h8500-tdep.c b/gdb/h8500-tdep.c
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+/* Target-dependent code for Hitachi H8/500, for GDB.
+ Copyright 1993, 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. */
+
+/*
+ Contributed by Steve Chamberlain
+ sac@cygnus.com
+ */
+
+#include "defs.h"
+#include "frame.h"
+#include "obstack.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "gdbcmd.h"
+#include "value.h"
+#include "dis-asm.h"
+#include "gdbcore.h"
+
+#define UNSIGNED_SHORT(X) ((X) & 0xffff)
+
+static int code_size = 2;
+
+static int data_size = 2;
+
+/* Shape of an H8/500 frame :
+
+ arg-n
+ ..
+ arg-2
+ arg-1
+ return address <2 or 4 bytes>
+ old fp <2 bytes>
+ auto-n
+ ..
+ auto-1
+ saved registers
+
+*/
+
+/* an easy to debug H8 stack frame looks like:
+0x6df6 push r6
+0x0d76 mov.w r7,r6
+0x6dfn push reg
+0x7905 nnnn mov.w #n,r5 or 0x1b87 subs #2,sp
+0x1957 sub.w r5,sp
+
+ */
+
+#define IS_PUSH(x) (((x) & 0xff00)==0x6d00)
+#define IS_LINK_8(x) ((x) == 0x17)
+#define IS_LINK_16(x) ((x) == 0x1f)
+#define IS_MOVE_FP(x) ((x) == 0x0d76)
+#define IS_MOV_SP_FP(x) ((x) == 0x0d76)
+#define IS_SUB2_SP(x) ((x) == 0x1b87)
+#define IS_MOVK_R5(x) ((x) == 0x7905)
+#define IS_SUB_R5SP(x) ((x) == 0x1957)
+
+#define LINK_8 0x17
+#define LINK_16 0x1f
+
+int minimum_mode = 1;
+
+CORE_ADDR
+h8500_skip_prologue (start_pc)
+ CORE_ADDR start_pc;
+{
+ short int w;
+
+ w = read_memory_integer (start_pc, 1);
+ if (w == LINK_8)
+ {
+ start_pc += 2;
+ w = read_memory_integer (start_pc, 1);
+ }
+
+ if (w == LINK_16)
+ {
+ start_pc += 3;
+ w = read_memory_integer (start_pc, 2);
+ }
+
+ return start_pc;
+}
+
+CORE_ADDR
+h8500_addr_bits_remove (addr)
+ CORE_ADDR addr;
+{
+ return ((addr) & 0xffffff);
+}
+
+/* Given a GDB frame, determine the address of the calling function's frame.
+ This will be used to create a new GDB frame struct, and then
+ INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+
+ For us, the frame address is its stack pointer value, so we look up
+ the function prologue to determine the caller's sp value, and return it. */
+
+CORE_ADDR
+h8500_frame_chain (thisframe)
+ struct frame_info *thisframe;
+{
+ if (!inside_entry_file (thisframe->pc))
+ return (read_memory_integer (FRAME_FP (thisframe), PTR_SIZE));
+ else
+ return 0;
+}
+
+/* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
+ is not the address of a valid instruction, the address of the next
+ instruction beyond ADDR otherwise. *PWORD1 receives the first word
+ of the instruction.*/
+
+CORE_ADDR
+NEXT_PROLOGUE_INSN (addr, lim, pword1)
+ CORE_ADDR addr;
+ CORE_ADDR lim;
+ char *pword1;
+{
+ if (addr < lim + 8)
+ {
+ read_memory (addr, pword1, 1);
+ read_memory (addr, pword1 + 1, 1);
+ return 1;
+ }
+ return 0;
+}
+
+/* Examine the prologue of a function. `ip' points to the first
+ instruction. `limit' is the limit of the prologue (e.g. the addr
+ of the first linenumber, or perhaps the program counter if we're
+ stepping through). `frame_sp' is the stack pointer value in use in
+ this frame. `fsr' is a pointer to a frame_saved_regs structure
+ into which we put info about the registers saved by this frame.
+ `fi' is a struct frame_info pointer; we fill in various fields in
+ it to reflect the offsets of the arg pointer and the locals
+ pointer. */
+
+/* Return the saved PC from this frame. */
+
+CORE_ADDR
+frame_saved_pc (frame)
+ struct frame_info *frame;
+{
+ return read_memory_integer (FRAME_FP (frame) + 2, PTR_SIZE);
+}
+
+void
+h8500_pop_frame ()
+{
+ unsigned regnum;
+ struct frame_saved_regs fsr;
+ struct frame_info *frame = get_current_frame ();
+
+ get_frame_saved_regs (frame, &fsr);
+
+ for (regnum = 0; regnum < 8; regnum++)
+ {
+ if (fsr.regs[regnum])
+ write_register (regnum, read_memory_short (fsr.regs[regnum]));
+
+ flush_cached_frames ();
+ }
+}
+
+void
+print_register_hook (regno)
+ int regno;
+{
+ if (regno == CCR_REGNUM)
+ {
+ /* CCR register */
+
+ int C, Z, N, V;
+ unsigned char b[2];
+ unsigned char l;
+
+ read_relative_register_raw_bytes (regno, b);
+ l = b[1];
+ printf_unfiltered ("\t");
+ printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
+ N = (l & 0x8) != 0;
+ Z = (l & 0x4) != 0;
+ V = (l & 0x2) != 0;
+ C = (l & 0x1) != 0;
+ printf_unfiltered ("N-%d ", N);
+ printf_unfiltered ("Z-%d ", Z);
+ printf_unfiltered ("V-%d ", V);
+ printf_unfiltered ("C-%d ", C);
+ if ((C | Z) == 0)
+ printf_unfiltered ("u> ");
+ if ((C | Z) == 1)
+ printf_unfiltered ("u<= ");
+ if ((C == 0))
+ printf_unfiltered ("u>= ");
+ if (C == 1)
+ printf_unfiltered ("u< ");
+ if (Z == 0)
+ printf_unfiltered ("!= ");
+ if (Z == 1)
+ printf_unfiltered ("== ");
+ if ((N ^ V) == 0)
+ printf_unfiltered (">= ");
+ if ((N ^ V) == 1)
+ printf_unfiltered ("< ");
+ if ((Z | (N ^ V)) == 0)
+ printf_unfiltered ("> ");
+ if ((Z | (N ^ V)) == 1)
+ printf_unfiltered ("<= ");
+ }
+}
+
+int
+h8500_register_size (regno)
+ int regno;
+{
+ switch (regno)
+ {
+ case SEG_C_REGNUM:
+ case SEG_D_REGNUM:
+ case SEG_E_REGNUM:
+ case SEG_T_REGNUM:
+ return 1;
+ case R0_REGNUM:
+ case R1_REGNUM:
+ case R2_REGNUM:
+ case R3_REGNUM:
+ case R4_REGNUM:
+ case R5_REGNUM:
+ case R6_REGNUM:
+ case R7_REGNUM:
+ case CCR_REGNUM:
+ return 2;
+
+ case PR0_REGNUM:
+ case PR1_REGNUM:
+ case PR2_REGNUM:
+ case PR3_REGNUM:
+ case PR4_REGNUM:
+ case PR5_REGNUM:
+ case PR6_REGNUM:
+ case PR7_REGNUM:
+ case PC_REGNUM:
+ return 4;
+ default:
+ abort ();
+ }
+}
+
+struct type *
+h8500_register_virtual_type (regno)
+ int regno;
+{
+ switch (regno)
+ {
+ case SEG_C_REGNUM:
+ case SEG_E_REGNUM:
+ case SEG_D_REGNUM:
+ case SEG_T_REGNUM:
+ return builtin_type_unsigned_char;
+ case R0_REGNUM:
+ case R1_REGNUM:
+ case R2_REGNUM:
+ case R3_REGNUM:
+ case R4_REGNUM:
+ case R5_REGNUM:
+ case R6_REGNUM:
+ case R7_REGNUM:
+ case CCR_REGNUM:
+ return builtin_type_unsigned_short;
+ case PR0_REGNUM:
+ case PR1_REGNUM:
+ case PR2_REGNUM:
+ case PR3_REGNUM:
+ case PR4_REGNUM:
+ case PR5_REGNUM:
+ case PR6_REGNUM:
+ case PR7_REGNUM:
+ case PC_REGNUM:
+ return builtin_type_unsigned_long;
+ default:
+ abort ();
+ }
+}
+
+/* Put here the code to store, into a struct frame_saved_regs,
+ the addresses of the saved registers of frame described by FRAME_INFO.
+ This includes special registers such as pc and fp saved in special
+ ways in the stack frame. sp is even more special:
+ the address we return for it IS the sp for the next frame. */
+
+void
+frame_find_saved_regs (frame_info, frame_saved_regs)
+ struct frame_info *frame_info;
+ struct frame_saved_regs *frame_saved_regs;
+{
+ register int regnum;
+ register int regmask;
+ register CORE_ADDR next_addr;
+ register CORE_ADDR pc;
+ unsigned char thebyte;
+
+ memset (frame_saved_regs, '\0', sizeof *frame_saved_regs);
+
+ if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4
+ && (frame_info)->pc <= (frame_info)->frame)
+ {
+ next_addr = (frame_info)->frame;
+ pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4;
+ }
+ else
+ {
+ pc = get_pc_function_start ((frame_info)->pc);
+ /* Verify we have a link a6 instruction next;
+ if not we lose. If we win, find the address above the saved
+ regs using the amount of storage from the link instruction.
+ */
+
+ thebyte = read_memory_integer (pc, 1);
+ if (0x1f == thebyte)
+ next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 2), pc += 2;
+ else if (0x17 == thebyte)
+ next_addr = (frame_info)->frame + read_memory_integer (pc += 1, 1), pc += 1;
+ else
+ goto lose;
+#if 0
+ /* FIXME steve */
+ /* If have an add:g.waddal #-n, sp next, adjust next_addr. */
+ if ((0x0c0177777 & read_memory_integer (pc, 2)) == 0157774)
+ next_addr += read_memory_integer (pc += 2, 4), pc += 4;
+#endif
+ }
+
+ thebyte = read_memory_integer (pc, 1);
+ if (thebyte == 0x12)
+ {
+ /* Got stm */
+ pc++;
+ regmask = read_memory_integer (pc, 1);
+ pc++;
+ for (regnum = 0; regnum < 8; regnum++, regmask >>= 1)
+ {
+ if (regmask & 1)
+ {
+ (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
+ }
+ }
+ thebyte = read_memory_integer (pc, 1);
+ }
+ /* Maybe got a load of pushes */
+ while (thebyte == 0xbf)
+ {
+ pc++;
+ regnum = read_memory_integer (pc, 1) & 0x7;
+ pc++;
+ (frame_saved_regs)->regs[regnum] = (next_addr += 2) - 2;
+ thebyte = read_memory_integer (pc, 1);
+ }
+
+lose:;
+
+ /* Remember the address of the frame pointer */
+ (frame_saved_regs)->regs[FP_REGNUM] = (frame_info)->frame;
+
+ /* This is where the old sp is hidden */
+ (frame_saved_regs)->regs[SP_REGNUM] = (frame_info)->frame;
+
+ /* And the PC - remember the pushed FP is always two bytes long */
+ (frame_saved_regs)->regs[PC_REGNUM] = (frame_info)->frame + 2;
+}
+
+CORE_ADDR
+saved_pc_after_call ()
+{
+ int x;
+ int a = read_register (SP_REGNUM);
+
+ x = read_memory_integer (a, code_size);
+ if (code_size == 2)
+ {
+ /* Stick current code segement onto top */
+ x &= 0xffff;
+ x |= read_register (SEG_C_REGNUM) << 16;
+ }
+ x &= 0xffffff;
+ return x;
+}
+
+void
+h8500_set_pointer_size (newsize)
+ int newsize;
+{
+ static int oldsize = 0;
+
+ if (oldsize != newsize)
+ {
+ printf_unfiltered ("pointer size set to %d bits\n", newsize);
+ oldsize = newsize;
+ if (newsize == 32)
+ {
+ minimum_mode = 0;
+ }
+ else
+ {
+ minimum_mode = 1;
+ }
+ _initialize_gdbtypes ();
+ }
+}
+
+static void
+big_command ()
+{
+ h8500_set_pointer_size (32);
+ code_size = 4;
+ data_size = 4;
+}
+
+static void
+medium_command ()
+{
+ h8500_set_pointer_size (32);
+ code_size = 4;
+ data_size = 2;
+}
+
+static void
+compact_command ()
+{
+ h8500_set_pointer_size (32);
+ code_size = 2;
+ data_size = 4;
+}
+
+static void
+small_command ()
+{
+ h8500_set_pointer_size (16);
+ code_size = 2;
+ data_size = 2;
+}
+
+static struct cmd_list_element *setmemorylist;
+
+static void
+set_memory (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ printf_unfiltered ("\"set memory\" must be followed by the name of a memory subcommand.\n");
+ help_list (setmemorylist, "set memory ", -1, gdb_stdout);
+}
+
+/* See if variable name is ppc or pr[0-7] */
+
+int
+h8500_is_trapped_internalvar (name)
+ char *name;
+{
+ if (name[0] != 'p')
+ return 0;
+
+ if (strcmp (name + 1, "pc") == 0)
+ return 1;
+
+ if (name[1] == 'r'
+ && name[2] >= '0'
+ && name[2] <= '7'
+ && name[3] == '\000')
+ return 1;
+ else
+ return 0;
+}
+
+value_ptr
+h8500_value_of_trapped_internalvar (var)
+ struct internalvar *var;
+{
+ LONGEST regval;
+ unsigned char regbuf[4];
+ int page_regnum, regnum;
+
+ regnum = var->name[2] == 'c' ? PC_REGNUM : var->name[2] - '0';
+
+ switch (var->name[2])
+ {
+ case 'c':
+ page_regnum = SEG_C_REGNUM;
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ page_regnum = SEG_D_REGNUM;
+ break;
+ case '4':
+ case '5':
+ page_regnum = SEG_E_REGNUM;
+ break;
+ case '6':
+ case '7':
+ page_regnum = SEG_T_REGNUM;
+ break;
+ }
+
+ get_saved_register (regbuf, NULL, NULL, selected_frame, page_regnum, NULL);
+ regval = regbuf[0] << 16;
+
+ get_saved_register (regbuf, NULL, NULL, selected_frame, regnum, NULL);
+ regval |= regbuf[0] << 8 | regbuf[1]; /* XXX host/target byte order */
+
+ free (var->value); /* Free up old value */
+
+ var->value = value_from_longest (builtin_type_unsigned_long, regval);
+ release_value (var->value); /* Unchain new value */
+
+ VALUE_LVAL (var->value) = lval_internalvar;
+ VALUE_INTERNALVAR (var->value) = var;
+ return var->value;
+}
+
+void
+h8500_set_trapped_internalvar (var, newval, bitpos, bitsize, offset)
+ struct internalvar *var;
+ int offset, bitpos, bitsize;
+ value_ptr newval;
+{
+ char *page_regnum, *regnum;
+ char expression[100];
+ unsigned new_regval;
+ struct type *type;
+ enum type_code newval_type_code;
+
+ type = check_typedef (VALUE_TYPE (newval));
+ newval_type_code = TYPE_CODE (type);
+
+ if ((newval_type_code != TYPE_CODE_INT
+ && newval_type_code != TYPE_CODE_PTR)
+ || TYPE_LENGTH (type) != sizeof (new_regval))
+ error ("Illegal type (%s) for assignment to $%s\n",
+ TYPE_NAME (VALUE_TYPE (newval)), var->name);
+
+ new_regval = *(long *) VALUE_CONTENTS_RAW (newval);
+
+ regnum = var->name + 1;
+
+ switch (var->name[2])
+ {
+ case 'c':
+ page_regnum = "cp";
+ break;
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ page_regnum = "dp";
+ break;
+ case '4':
+ case '5':
+ page_regnum = "ep";
+ break;
+ case '6':
+ case '7':
+ page_regnum = "tp";
+ break;
+ }
+
+ sprintf (expression, "$%s=%d", page_regnum, new_regval >> 16);
+ parse_and_eval (expression);
+
+ sprintf (expression, "$%s=%d", regnum, new_regval & 0xffff);
+ parse_and_eval (expression);
+}
+
+CORE_ADDR
+h8500_read_sp ()
+{
+ return read_register (PR7_REGNUM);
+}
+
+void
+h8500_write_sp (v)
+ CORE_ADDR v;
+{
+ write_register (PR7_REGNUM, v);
+}
+
+CORE_ADDR
+h8500_read_pc (pid)
+ int pid;
+{
+ return read_register (PC_REGNUM);
+}
+
+void
+h8500_write_pc (v, pid)
+ CORE_ADDR v;
+ int pid;
+{
+ write_register (PC_REGNUM, v);
+}
+
+CORE_ADDR
+h8500_read_fp ()
+{
+ return read_register (PR6_REGNUM);
+}
+
+void
+h8500_write_fp (v)
+ CORE_ADDR v;
+{
+ write_register (PR6_REGNUM, v);
+}
+
+void
+_initialize_h8500_tdep ()
+{
+ tm_print_insn = print_insn_h8500;
+
+ add_prefix_cmd ("memory", no_class, set_memory,
+ "set the memory model", &setmemorylist, "set memory ", 0,
+ &setlist);
+
+ add_cmd ("small", class_support, small_command,
+ "Set small memory model. (16 bit code, 16 bit data)", &setmemorylist);
+
+ add_cmd ("big", class_support, big_command,
+ "Set big memory model. (32 bit code, 32 bit data)", &setmemorylist);
+
+ add_cmd ("medium", class_support, medium_command,
+ "Set medium memory model. (32 bit code, 16 bit data)", &setmemorylist);
+
+ add_cmd ("compact", class_support, compact_command,
+ "Set compact memory model. (16 bit code, 32 bit data)", &setmemorylist);
+
+}