#include "defs.h"
#include "arch-utils.h"
#include "dis-asm.h"
#include "frame.h"
#include "frame-base.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "gdbtypes.h"
#include "regcache.h"
#include "regset.h"
#include "symtab.h"
#include "trad-frame.h"
#include "value.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "m88k-tdep.h"
static unsigned long
m88k_fetch_instruction (CORE_ADDR pc)
{
return read_memory_unsigned_integer (pc, 4);
}
static const char *
m88k_register_name (int regnum)
{
static char *register_names[] =
{
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
"epsr", "fpsr", "fpcr", "sxip", "snip", "sfip"
};
if (regnum >= 0 && regnum < ARRAY_SIZE (register_names))
return register_names[regnum];
return NULL;
}
static struct type *
m88k_register_type (struct gdbarch *gdbarch, int regnum)
{
if ((regnum >= M88K_SXIP_REGNUM && regnum <= M88K_SFIP_REGNUM)
|| regnum == M88K_R1_REGNUM)
return builtin_type_void_func_ptr;
if (regnum == M88K_R30_REGNUM || regnum == M88K_R31_REGNUM)
return builtin_type_void_data_ptr;
return builtin_type_int32;
}
static CORE_ADDR
m88k_addr_bits_remove (CORE_ADDR addr)
{
return addr & ~0x3;
}
static const gdb_byte *
m88k_breakpoint_from_pc (CORE_ADDR *pc, int *len)
{
static gdb_byte break_insn[] = { 0xf0, 0x00, 0xd1, 0xff };
*len = sizeof (break_insn);
return break_insn;
}
static CORE_ADDR
m88k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
CORE_ADDR pc;
pc = frame_unwind_register_unsigned (next_frame, M88K_SXIP_REGNUM);
return m88k_addr_bits_remove (pc);
}
static void
m88k_write_pc (CORE_ADDR pc, ptid_t ptid)
{
write_register_pid (M88K_SXIP_REGNUM, pc, ptid);
write_register_pid (M88K_SNIP_REGNUM, pc | 2, ptid);
write_register_pid (M88K_SFIP_REGNUM, (pc + 4) | 2, ptid);
}
static int
m88k_integral_or_pointer_p (const struct type *type)
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
case TYPE_CODE_ENUM:
case TYPE_CODE_RANGE:
{
int len = TYPE_LENGTH (type);
return (len == 1 || len == 2 || len == 4 || len == 8);
}
return 1;
case TYPE_CODE_PTR:
case TYPE_CODE_REF:
{
return (TYPE_LENGTH (type) == 4);
}
return 1;
default:
break;
}
return 0;
}
static int
m88k_floating_p (const struct type *type)
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_FLT:
{
int len = TYPE_LENGTH (type);
return (len == 4 || len == 8);
}
default:
break;
}
return 0;
}
static int
m88k_structure_or_union_p (const struct type *type)
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
return 1;
default:
break;
}
return 0;
}
static int
m88k_8_byte_align_p (struct type *type)
{
if (m88k_structure_or_union_p (type))
{
int i;
for (i = 0; i < TYPE_NFIELDS (type); i++)
{
struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i));
if (m88k_8_byte_align_p (subtype))
return 1;
}
}
if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
return (TYPE_LENGTH (type) == 8);
return 0;
}
static int
m88k_in_register_p (struct type *type)
{
if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
return 1;
if (m88k_structure_or_union_p (type) && TYPE_LENGTH (type) == 4)
return 1;
return 0;
}
static CORE_ADDR
m88k_store_arguments (struct regcache *regcache, int nargs,
struct value **args, CORE_ADDR sp)
{
int num_register_words = 0;
int num_stack_words = 0;
int i;
for (i = 0; i < nargs; i++)
{
struct type *type = value_type (args[i]);
int len = TYPE_LENGTH (type);
if (m88k_integral_or_pointer_p (type) && len < 4)
{
args[i] = value_cast (builtin_type_int32, args[i]);
type = value_type (args[i]);
len = TYPE_LENGTH (type);
}
if (m88k_in_register_p (type))
{
int num_words = 0;
if (num_register_words % 2 == 1 && m88k_8_byte_align_p (type))
num_words++;
num_words += ((len + 3) / 4);
if (num_register_words + num_words <= 8)
{
num_register_words += num_words;
continue;
}
}
if (num_stack_words % 2 == 1 && m88k_8_byte_align_p (type))
num_stack_words++;
num_stack_words += ((len + 3) / 4);
}
sp = align_down (sp - 32 - num_stack_words * 4, 16);
num_stack_words = num_register_words = 0;
for (i = 0; i < nargs; i++)
{
const bfd_byte *valbuf = value_contents (args[i]);
struct type *type = value_type (args[i]);
int len = TYPE_LENGTH (type);
int stack_word = num_stack_words;
if (m88k_in_register_p (type))
{
int register_word = num_register_words;
if (register_word % 2 == 1 && m88k_8_byte_align_p (type))
register_word++;
gdb_assert (len == 4 || len == 8);
if (register_word + len / 8 < 8)
{
int regnum = M88K_R2_REGNUM + register_word;
regcache_raw_write (regcache, regnum, valbuf);
if (len > 4)
regcache_raw_write (regcache, regnum + 1, valbuf + 4);
num_register_words = (register_word + len / 4);
continue;
}
}
if (stack_word % 2 == -1 && m88k_8_byte_align_p (type))
stack_word++;
write_memory (sp + stack_word * 4, valbuf, len);
num_stack_words = (stack_word + (len + 3) / 4);
}
return sp;
}
static CORE_ADDR
m88k_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
struct value **args, CORE_ADDR sp, int struct_return,
CORE_ADDR struct_addr)
{
sp = m88k_store_arguments (regcache, nargs, args, sp);
gdb_assert (sp % 16 == 0);
if (struct_return)
regcache_raw_write_unsigned (regcache, M88K_R12_REGNUM, struct_addr);
regcache_raw_write_unsigned (regcache, M88K_R31_REGNUM, sp);
regcache_raw_write_unsigned (regcache, M88K_R1_REGNUM, bp_addr);
return sp;
}
static struct frame_id
m88k_unwind_dummy_id (struct gdbarch *arch, struct frame_info *next_frame)
{
CORE_ADDR sp;
sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
return frame_id_build (sp, frame_pc_unwind (next_frame));
}
static enum return_value_convention
m88k_return_value (struct gdbarch *gdbarch, struct type *type,
struct regcache *regcache, gdb_byte *readbuf,
const gdb_byte *writebuf)
{
int len = TYPE_LENGTH (type);
gdb_byte buf[8];
if (!m88k_integral_or_pointer_p (type) && !m88k_floating_p (type))
return RETURN_VALUE_STRUCT_CONVENTION;
if (readbuf)
{
regcache_cooked_read (regcache, M88K_R2_REGNUM, buf);
if (len > 4)
{
regcache_cooked_read (regcache, M88K_R3_REGNUM, buf + 4);
gdb_assert (len == 8);
memcpy (readbuf, buf, len);
}
else
{
memcpy (readbuf, buf + 4 - len, len);
}
}
if (writebuf)
{
if (len > 4)
{
gdb_assert (len == 8);
memcpy (buf, writebuf, 8);
regcache_cooked_write (regcache, M88K_R3_REGNUM, buf + 4);
}
else
{
memcpy (buf + 4 - len, writebuf, len);
}
regcache_cooked_write (regcache, M88K_R2_REGNUM, buf);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
struct m88k_frame_cache
{
CORE_ADDR base;
CORE_ADDR pc;
int sp_offset;
int fp_offset;
struct trad_frame_saved_reg *saved_regs;
};
#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
enum m88k_prologue_insn_action
{
M88K_PIA_SKIP,
M88K_PIA_NOTE_ST,
M88K_PIA_NOTE_STD,
M88K_PIA_NOTE_SP_ADJUSTMENT,
M88K_PIA_NOTE_FP_ASSIGNMENT,
M88K_PIA_NOTE_BRANCH,
M88K_PIA_NOTE_PROLOGUE_END
};
struct m88k_prologue_insn
{
unsigned long insn;
unsigned long mask;
enum m88k_prologue_insn_action action;
};
struct m88k_prologue_insn m88k_prologue_insn_table[] =
{
{ 0x58000000, 0xf800ffff, M88K_PIA_SKIP },
{ 0xf4005800, 0xfc1fffe0, M88K_PIA_SKIP },
{ 0xf4005800, 0xfc00ffff, M88K_PIA_SKIP },
{ 0x58000000, 0xf8000000, M88K_PIA_SKIP },
{ 0x67ff0000, 0xffff0007, M88K_PIA_NOTE_SP_ADJUSTMENT },
{ 0x63df0000, 0xffff0000, M88K_PIA_NOTE_FP_ASSIGNMENT },
{ 0x241f0000, 0xfc1f0000, M88K_PIA_NOTE_ST },
{ 0x201f0000, 0xfc1f0000, M88K_PIA_NOTE_STD },
{ 0x5f200000, 0xffff0000, M88K_PIA_SKIP },
{ 0xcc000002, 0xffffffff, M88K_PIA_SKIP },
{ 0x5b390000, 0xffff0000, M88K_PIA_SKIP },
{ 0xf7396001, 0xffffffff, M88K_PIA_SKIP },
{ 0xc4000000, 0xe4000000, M88K_PIA_NOTE_BRANCH },
{ 0xec000000, 0xfc000000, M88K_PIA_NOTE_BRANCH },
{ 0xf400c400, 0xfffff7e0, M88K_PIA_NOTE_BRANCH },
{ 0x00000000, 0x00000000, M88K_PIA_NOTE_PROLOGUE_END }
};
static CORE_ADDR
m88k_analyze_prologue (CORE_ADDR pc, CORE_ADDR limit,
struct m88k_frame_cache *cache)
{
CORE_ADDR end = limit;
if (cache == NULL)
{
size_t sizeof_saved_regs =
(M88K_R31_REGNUM + 1) * sizeof (struct trad_frame_saved_reg);
cache = alloca (sizeof (struct m88k_frame_cache));
cache->saved_regs = alloca (sizeof_saved_regs);
cache->saved_regs[M88K_R1_REGNUM].addr = -1;
cache->fp_offset = -1;
}
while (pc < limit)
{
struct m88k_prologue_insn *pi = m88k_prologue_insn_table;
unsigned long insn = m88k_fetch_instruction (pc);
while ((insn & pi->mask) != pi->insn)
pi++;
switch (pi->action)
{
case M88K_PIA_SKIP:
if (cache->fp_offset != -1
&& cache->saved_regs[M88K_R1_REGNUM].addr != -1)
return min (pc, end);
break;
case M88K_PIA_NOTE_ST:
case M88K_PIA_NOTE_STD:
if (cache->sp_offset == 0)
return min (pc, end);
{
int regnum = ST_SRC (insn) + M88K_R0_REGNUM;
ULONGEST offset = ST_OFFSET (insn);
cache->saved_regs[regnum].addr = offset;
if (pi->action == M88K_PIA_NOTE_STD && regnum < M88K_R31_REGNUM)
cache->saved_regs[regnum + 1].addr = offset + 4;
}
break;
case M88K_PIA_NOTE_SP_ADJUSTMENT:
if (cache->sp_offset != 0)
return min (pc, end);
cache->sp_offset = -SUBU_OFFSET (insn);
break;
case M88K_PIA_NOTE_FP_ASSIGNMENT:
if (cache->fp_offset != -1)
return min (pc, end);
cache->fp_offset = ADDU_OFFSET (insn);
break;
case M88K_PIA_NOTE_BRANCH:
limit = min (limit, pc + 2 * M88K_INSN_SIZE);
end = pc;
break;
case M88K_PIA_NOTE_PROLOGUE_END:
return min (pc, end);
}
pc += M88K_INSN_SIZE;
}
return end;
}
const int m88k_max_prologue_size = 128 * M88K_INSN_SIZE;
static CORE_ADDR
m88k_skip_prologue (CORE_ADDR pc)
{
struct symtab_and_line sal;
CORE_ADDR func_start, func_end;
if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
{
sal = find_pc_line (func_start, 0);
if (sal.end < func_end && pc <= sal.end)
return sal.end;
}
return m88k_analyze_prologue (pc, pc + m88k_max_prologue_size, NULL);
}
struct m88k_frame_cache *
m88k_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct m88k_frame_cache *cache;
CORE_ADDR frame_sp;
if (*this_cache)
return *this_cache;
cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
cache->fp_offset = -1;
cache->pc = frame_func_unwind (next_frame);
if (cache->pc != 0)
{
CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
m88k_analyze_prologue (cache->pc, addr_in_block, cache);
}
if (cache->fp_offset != -1)
{
CORE_ADDR fp;
fp = frame_unwind_register_unsigned (next_frame, M88K_R30_REGNUM);
frame_sp = fp - cache->fp_offset;
}
else
{
if (cache->saved_regs[M88K_R1_REGNUM].addr != -1)
cache->fp_offset = cache->saved_regs[M88K_R1_REGNUM].addr - 4;
frame_sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
}
{
int regnum;
for (regnum = M88K_R0_REGNUM; regnum < M88K_R31_REGNUM; regnum ++)
if (cache->saved_regs[regnum].addr != -1)
cache->saved_regs[regnum].addr += frame_sp;
}
cache->base = frame_sp - cache->sp_offset;
trad_frame_set_value (cache->saved_regs, M88K_R31_REGNUM, cache->base);
cache->saved_regs[M88K_SXIP_REGNUM] = cache->saved_regs[M88K_R1_REGNUM];
*this_cache = cache;
return cache;
}
static void
m88k_frame_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
if (cache->base == 0)
return;
(*this_id) = frame_id_build (cache->base, cache->pc);
}
static void
m88k_frame_prev_register (struct frame_info *next_frame, void **this_cache,
int regnum, enum opt_state *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, gdb_byte *valuep)
{
struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
if (regnum == M88K_SNIP_REGNUM || regnum == M88K_SFIP_REGNUM)
{
if (valuep)
{
CORE_ADDR pc;
trad_frame_get_prev_register (next_frame, cache->saved_regs,
M88K_SXIP_REGNUM, optimizedp,
lvalp, addrp, realnump, valuep);
pc = extract_unsigned_integer (valuep, 4);
if (regnum == M88K_SFIP_REGNUM)
pc += 4;
store_unsigned_integer (valuep, 4, pc + 4);
}
*optimizedp = opt_okay;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
return;
}
trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind m88k_frame_unwind =
{
NORMAL_FRAME,
m88k_frame_this_id,
m88k_frame_prev_register
};
static const struct frame_unwind *
m88k_frame_sniffer (struct frame_info *next_frame)
{
return &m88k_frame_unwind;
}
static CORE_ADDR
m88k_frame_base_address (struct frame_info *next_frame, void **this_cache)
{
struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
if (cache->fp_offset != -1)
return cache->base + cache->sp_offset + cache->fp_offset;
return 0;
}
static const struct frame_base m88k_frame_base =
{
&m88k_frame_unwind,
m88k_frame_base_address,
m88k_frame_base_address,
m88k_frame_base_address
};
static void
m88k_supply_gregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *gregs, size_t len)
{
const gdb_byte *regs = gregs;
int i;
for (i = 0; i < M88K_NUM_REGS; i++)
{
if (regnum == i || regnum == -1)
regcache_raw_supply (regcache, i, regs + i * 4);
}
}
static struct regset m88k_gregset =
{
NULL,
m88k_supply_gregset
};
static const struct regset *
m88k_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name, size_t sect_size)
{
if (strcmp (sect_name, ".reg") == 0 && sect_size >= M88K_NUM_REGS * 4)
return &m88k_gregset;
return NULL;
}
static struct gdbarch *
m88k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
gdbarch = gdbarch_alloc (&info, NULL);
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
set_gdbarch_num_regs (gdbarch, M88K_NUM_REGS);
set_gdbarch_register_name (gdbarch, m88k_register_name);
set_gdbarch_register_type (gdbarch, m88k_register_type);
set_gdbarch_sp_regnum (gdbarch, M88K_R31_REGNUM);
set_gdbarch_pc_regnum (gdbarch, M88K_SXIP_REGNUM);
set_gdbarch_regset_from_core_section
(gdbarch, m88k_regset_from_core_section);
set_gdbarch_print_insn (gdbarch, print_insn_m88k);
set_gdbarch_skip_prologue (gdbarch, m88k_skip_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_push_dummy_call (gdbarch, m88k_push_dummy_call);
set_gdbarch_unwind_dummy_id (gdbarch, m88k_unwind_dummy_id);
set_gdbarch_return_value (gdbarch, m88k_return_value);
set_gdbarch_addr_bits_remove (gdbarch, m88k_addr_bits_remove);
set_gdbarch_breakpoint_from_pc (gdbarch, m88k_breakpoint_from_pc);
set_gdbarch_unwind_pc (gdbarch, m88k_unwind_pc);
set_gdbarch_write_pc (gdbarch, m88k_write_pc);
frame_base_set_default (gdbarch, &m88k_frame_base);
frame_unwind_append_sniffer (gdbarch, m88k_frame_sniffer);
return gdbarch;
}
void _initialize_m88k_tdep (void);
void
_initialize_m88k_tdep (void)
{
gdbarch_register (bfd_arch_m88k, m88k_gdbarch_init, NULL);
}