binutils-gdb/gdb/h8500-tdep.c

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/* Target-dependent code for Hitachi H8/500, for GDB.
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Copyright 1993, 1994, 1995, 1998, 2000, 2001
Free Software Foundation, Inc.
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This file is part of GDB.
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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.
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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.
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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. */
/*
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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"
#include "regcache.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>
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old fp <2 bytes>
auto-n
..
auto-1
saved registers
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*/
/* an easy to debug H8 stack frame looks like:
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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
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h8500_skip_prologue (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
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h8500_addr_bits_remove (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
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h8500_frame_chain (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
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of the instruction. */
CORE_ADDR
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NEXT_PROLOGUE_INSN (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
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frame_saved_pc (struct frame_info *frame)
{
return read_memory_integer (FRAME_FP (frame) + 2, PTR_SIZE);
}
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void
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h8500_pop_frame (void)
{
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
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print_register_hook (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
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h8500_register_size (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:
internal_error (__FILE__, __LINE__, "failed internal consistency check");
}
}
struct type *
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h8500_register_virtual_type (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:
internal_error (__FILE__, __LINE__, "failed internal consistency check");
}
}
/* 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
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frame_find_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;
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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
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saved_pc_after_call (void)
{
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
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h8500_set_pointer_size (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 (char *arg, int from_tty)
{
h8500_set_pointer_size (32);
code_size = 4;
data_size = 4;
}
static void
medium_command (char *arg, int from_tty)
{
h8500_set_pointer_size (32);
code_size = 4;
data_size = 2;
}
static void
compact_command (char *arg, int from_tty)
{
h8500_set_pointer_size (32);
code_size = 2;
data_size = 4;
}
static void
small_command (char *arg, int from_tty)
{
h8500_set_pointer_size (16);
code_size = 2;
data_size = 2;
}
static struct cmd_list_element *setmemorylist;
static void
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set_memory (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
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h8500_is_trapped_internalvar (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
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h8500_value_of_trapped_internalvar (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);
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regval |= regbuf[0] << 8 | regbuf[1]; /* XXX host/target byte order */
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xfree (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
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h8500_set_trapped_internalvar (struct internalvar *var, value_ptr newval,
int bitpos, int bitsize, int offset)
{
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
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h8500_read_sp (void)
{
return read_register (PR7_REGNUM);
}
void
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h8500_write_sp (CORE_ADDR v)
{
write_register (PR7_REGNUM, v);
}
CORE_ADDR
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h8500_read_pc (int pid)
{
return read_register (PC_REGNUM);
}
void
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h8500_write_pc (CORE_ADDR v, int pid)
{
write_register (PC_REGNUM, v);
}
CORE_ADDR
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h8500_read_fp (void)
{
return read_register (PR6_REGNUM);
}
void
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h8500_write_fp (CORE_ADDR v)
{
write_register (PR6_REGNUM, v);
}
void
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_initialize_h8500_tdep (void)
{
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,
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"Set small memory model. (16 bit code, 16 bit data)", &setmemorylist);
add_cmd ("big", class_support, big_command,
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"Set big memory model. (32 bit code, 32 bit data)", &setmemorylist);
add_cmd ("medium", class_support, medium_command,
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"Set medium memory model. (32 bit code, 16 bit data)", &setmemorylist);
add_cmd ("compact", class_support, compact_command,
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"Set compact memory model. (16 bit code, 32 bit data)", &setmemorylist);
}