#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "gdb_string.h"
#include "value.h"
#include "inferior.h"
#include "symfile.h"
#include "objfiles.h"
#include "osabi.h"
#include "language.h"
#include "arch-utils.h"
#include "regcache.h"
#include "trad-frame.h"
#include "dis-asm.h"
#include "gdb_assert.h"
#include "m32r-tdep.h"
extern void _initialize_m32r_tdep (void);
static CORE_ADDR
m32r_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
{
return sp & ~3;
}
static int
m32r_memory_insert_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache)
{
int val;
char buf[4];
char bp_entry[] = { 0x10, 0xf1 };
val = target_read_memory (addr & 0xfffffffc, contents_cache, 4);
if (val != 0)
return val;
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
if ((addr & 3) == 0)
{
buf[0] = bp_entry[0];
buf[1] = bp_entry[1];
buf[2] = contents_cache[2] & 0x7f;
buf[3] = contents_cache[3];
}
else
{
buf[0] = contents_cache[0];
buf[1] = contents_cache[1];
buf[2] = bp_entry[0];
buf[3] = bp_entry[1];
}
}
else
{
if ((addr & 3) == 0)
{
buf[0] = contents_cache[0];
buf[1] = contents_cache[1] & 0x7f;
buf[2] = bp_entry[1];
buf[3] = bp_entry[0];
}
else
{
buf[0] = bp_entry[1];
buf[1] = bp_entry[0];
buf[2] = contents_cache[2];
buf[3] = contents_cache[3];
}
}
val = target_write_memory (addr & 0xfffffffc, buf, 4);
return val;
}
static int
m32r_memory_remove_breakpoint (CORE_ADDR addr, bfd_byte *contents_cache)
{
int val;
char buf[4];
buf[0] = contents_cache[0];
buf[1] = contents_cache[1];
buf[2] = contents_cache[2];
buf[3] = contents_cache[3];
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
if ((buf[0] & 0x80) == 0 && (buf[2] & 0x80) != 0)
buf[2] &= 0x7f;
}
else
{
if ((buf[3] & 0x80) == 0 && (buf[1] & 0x80) != 0)
buf[1] &= 0x7f;
}
val = target_write_memory (addr & 0xfffffffc, buf, 4);
return val;
}
static const unsigned char *
m32r_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
static char be_bp_entry[] = { 0x10, 0xf1, 0x70, 0x00 };
static char le_bp_entry[] = { 0x00, 0x70, 0xf1, 0x10 };
unsigned char *bp;
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
if ((*pcptr & 3) == 0)
{
bp = be_bp_entry;
*lenptr = 4;
}
else
{
bp = be_bp_entry;
*lenptr = 2;
}
}
else
{
if ((*pcptr & 3) == 0)
{
bp = le_bp_entry;
*lenptr = 4;
}
else
{
bp = le_bp_entry + 2;
*lenptr = 2;
}
}
return bp;
}
char *m32r_register_names[] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "fp", "lr", "sp",
"psw", "cbr", "spi", "spu", "bpc", "pc", "accl", "acch",
"evb"
};
static const char *
m32r_register_name (int reg_nr)
{
if (reg_nr < 0)
return NULL;
if (reg_nr >= M32R_NUM_REGS)
return NULL;
return m32r_register_names[reg_nr];
}
static struct type *
m32r_register_type (struct gdbarch *gdbarch, int reg_nr)
{
if (reg_nr == M32R_PC_REGNUM)
return builtin_type_void_func_ptr;
else if (reg_nr == M32R_SP_REGNUM || reg_nr == M32R_FP_REGNUM)
return builtin_type_void_data_ptr;
else
return builtin_type_int32;
}
static void
m32r_store_return_value (struct type *type, struct regcache *regcache,
const void *valbuf)
{
CORE_ADDR regval;
int len = TYPE_LENGTH (type);
regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len);
regcache_cooked_write_unsigned (regcache, RET1_REGNUM, regval);
if (len > 4)
{
regval = extract_unsigned_integer ((char *) valbuf + 4, len - 4);
regcache_cooked_write_unsigned (regcache, RET1_REGNUM + 1, regval);
}
}
static int
decode_prologue (CORE_ADDR start_pc, CORE_ADDR scan_limit,
CORE_ADDR *pl_endptr, unsigned long *framelength)
{
unsigned long framesize;
int insn;
int op1;
CORE_ADDR after_prologue = 0;
CORE_ADDR after_push = 0;
CORE_ADDR after_stack_adjust = 0;
CORE_ADDR current_pc;
LONGEST return_value;
framesize = 0;
after_prologue = 0;
for (current_pc = start_pc; current_pc < scan_limit; current_pc += 2)
{
if (!safe_read_memory_integer (current_pc, 2, &return_value))
return -1;
insn = read_memory_unsigned_integer (current_pc, 2);
if (insn == 0x0000)
break;
if (current_pc & 0x02)
{
insn &= 0x7fff;
}
else
{
if (insn & 0x8000)
{
if (current_pc == scan_limit)
scan_limit += 2;
current_pc += 2;
if (!safe_read_memory_integer (current_pc, 2, &return_value))
return -1;
if (insn == 0x8faf)
{
framesize +=
-((short) read_memory_unsigned_integer (current_pc, 2));
}
else
{
if (((insn >> 8) == 0xe4)
&& safe_read_memory_integer (current_pc + 2, 2,
&return_value)
&& read_memory_unsigned_integer (current_pc + 2,
2) == 0x0f24)
{
insn = read_memory_unsigned_integer (current_pc - 2, 4);
if (insn & 0x00800000)
insn |= 0xff000000;
else
insn &= 0x00ffffff;
framesize += insn;
}
}
after_push = current_pc + 2;
continue;
}
}
op1 = insn & 0xf000;
if ((insn & 0xf0ff) == 0x207f)
{
int regno;
framesize += 4;
regno = ((insn >> 8) & 0xf);
after_prologue = 0;
continue;
}
if ((insn >> 8) == 0x4f)
{
int stack_adjust = (char) (insn & 0xff);
if (stack_adjust < 0)
{
framesize -= stack_adjust;
after_prologue = 0;
after_stack_adjust = current_pc + 2;
}
continue;
}
if (insn == 0x1d8f)
{
after_prologue = current_pc + 2;
break;
}
if (insn == 0x7000)
{
after_prologue = current_pc + 2;
continue;
}
if ((insn & 0xfff0) == 0x10f0)
{
after_prologue = current_pc;
break;
}
if ((op1 == 0x7000) || (op1 == 0xb000) || (op1 == 0xf000))
{
after_prologue = current_pc;
continue;
}
if (op1 == 0x1000)
{
int subop = insn & 0x0ff0;
if ((subop == 0x0ec0) || (subop == 0x0fc0))
{
after_prologue = current_pc;
continue;
}
}
}
if (framelength)
*framelength = framesize;
if (current_pc >= scan_limit)
{
if (pl_endptr)
{
if (after_stack_adjust != 0)
{
*pl_endptr = after_stack_adjust;
}
else if (after_push != 0)
{
*pl_endptr = after_push;
}
else
*pl_endptr = start_pc;
}
return 0;
}
if (after_prologue == 0)
after_prologue = current_pc;
if (pl_endptr)
*pl_endptr = after_prologue;
return 0;
}
#define DEFAULT_SEARCH_LIMIT 128
CORE_ADDR
m32r_skip_prologue (CORE_ADDR pc)
{
CORE_ADDR func_addr, func_end;
struct symtab_and_line sal;
LONGEST return_value;
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
{
sal = find_pc_line (func_addr, 0);
if (sal.line != 0 && sal.end <= func_end)
{
func_end = sal.end;
}
else
{
func_end = min (func_end, func_addr + DEFAULT_SEARCH_LIMIT);
}
}
else
func_end = pc + DEFAULT_SEARCH_LIMIT;
if (!safe_read_memory_integer (pc, 4, &return_value))
return pc;
if (decode_prologue (pc, func_end, &sal.end, NULL) < 0)
return pc;
return sal.end;
}
struct m32r_unwind_cache
{
CORE_ADDR prev_sp;
CORE_ADDR base;
int size;
LONGEST sp_offset;
LONGEST r13_offset;
int uses_frame;
struct trad_frame_saved_reg *saved_regs;
};
static struct m32r_unwind_cache *
m32r_frame_unwind_cache (struct frame_info *next_frame,
void **this_prologue_cache)
{
CORE_ADDR pc, scan_limit;
ULONGEST prev_sp;
ULONGEST this_base;
unsigned long op, op2;
int i;
struct m32r_unwind_cache *info;
if ((*this_prologue_cache))
return (*this_prologue_cache);
info = FRAME_OBSTACK_ZALLOC (struct m32r_unwind_cache);
(*this_prologue_cache) = info;
info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
info->size = 0;
info->sp_offset = 0;
info->uses_frame = 0;
scan_limit = frame_pc_unwind (next_frame);
for (pc = frame_func_unwind (next_frame);
pc > 0 && pc < scan_limit; pc += 2)
{
if ((pc & 2) == 0)
{
op = get_frame_memory_unsigned (next_frame, pc, 4);
if ((op & 0x80000000) == 0x80000000)
{
if ((op & 0xffff0000) == 0x8faf0000)
{
short n = op & 0xffff;
info->sp_offset += n;
}
else if (((op >> 8) == 0xe4)
&& get_frame_memory_unsigned (next_frame, pc + 2,
2) == 0x0f24)
{
unsigned long n = op & 0xffffff;
info->sp_offset += n;
pc += 2;
}
if (pc == scan_limit)
scan_limit += 2;
pc += 2;
continue;
}
}
op = get_frame_memory_unsigned (next_frame, pc, 2) & 0x7fff;
if ((op & 0xf0ff) == 0x207f)
{
int regno = ((op >> 8) & 0xf);
info->sp_offset -= 4;
info->saved_regs[regno].addr = info->sp_offset;
}
else if ((op & 0xff00) == 0x4f00)
{
int n = (char) (op & 0xff);
info->sp_offset += n;
}
else if (op == 0x1d8f)
{
info->uses_frame = 1;
info->r13_offset = info->sp_offset;
break;
}
else if ((op & 0xfff0) == 0x10f0)
{
break;
}
}
info->size = -info->sp_offset;
if (info->uses_frame)
{
this_base = frame_unwind_register_unsigned (next_frame, M32R_FP_REGNUM);
prev_sp = this_base + info->size;
}
else
{
this_base = frame_unwind_register_unsigned (next_frame, M32R_SP_REGNUM);
prev_sp = this_base + info->size;
}
info->prev_sp = prev_sp;
info->base = this_base;
for (i = 0; i < NUM_REGS - 1; i++)
if (trad_frame_addr_p (info->saved_regs, i))
info->saved_regs[i].addr = (info->prev_sp + info->saved_regs[i].addr);
info->saved_regs[M32R_PC_REGNUM] = info->saved_regs[LR_REGNUM];
trad_frame_set_value (info->saved_regs, M32R_SP_REGNUM, prev_sp);
return info;
}
static CORE_ADDR
m32r_read_pc (ptid_t ptid)
{
ptid_t save_ptid;
ULONGEST pc;
save_ptid = inferior_ptid;
inferior_ptid = ptid;
regcache_cooked_read_unsigned (current_regcache, M32R_PC_REGNUM, &pc);
inferior_ptid = save_ptid;
return pc;
}
static void
m32r_write_pc (CORE_ADDR val, ptid_t ptid)
{
ptid_t save_ptid;
save_ptid = inferior_ptid;
inferior_ptid = ptid;
write_register (M32R_PC_REGNUM, val);
inferior_ptid = save_ptid;
}
static CORE_ADDR
m32r_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, M32R_SP_REGNUM);
}
static CORE_ADDR
m32r_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)
{
int stack_offset, stack_alloc;
int argreg = ARG1_REGNUM;
int argnum;
struct type *type;
enum type_code typecode;
CORE_ADDR regval;
char *val;
char valbuf[MAX_REGISTER_SIZE];
int len;
int odd_sized_struct;
sp = sp & ~3;
regcache_cooked_write_unsigned (regcache, LR_REGNUM, bp_addr);
if (struct_return)
{
regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
argreg++;
}
for (argnum = 0, stack_alloc = 0; argnum < nargs; argnum++)
stack_alloc += ((TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3);
sp -= stack_alloc;
for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
{
type = value_type (args[argnum]);
typecode = TYPE_CODE (type);
len = TYPE_LENGTH (type);
memset (valbuf, 0, sizeof (valbuf));
if (len > 8
&& (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION))
{
store_unsigned_integer (valbuf, 4, VALUE_ADDRESS (args[argnum]));
typecode = TYPE_CODE_PTR;
len = 4;
val = valbuf;
}
else if (len < 4)
{
memcpy (valbuf + (register_size (gdbarch, argreg) - len),
(char *) value_contents (args[argnum]), len);
val = valbuf;
}
else
val = (char *) value_contents (args[argnum]);
while (len > 0)
{
if (argreg > ARGN_REGNUM)
{
write_memory (sp + stack_offset, val, 4);
stack_offset += 4;
}
else if (argreg <= ARGN_REGNUM)
{
regval =
extract_unsigned_integer (val,
register_size (gdbarch, argreg));
regcache_cooked_write_unsigned (regcache, argreg++, regval);
}
len -= register_size (gdbarch, argreg);
val += register_size (gdbarch, argreg);
}
}
regcache_cooked_write_unsigned (regcache, M32R_SP_REGNUM, sp);
return sp;
}
static void
m32r_extract_return_value (struct type *type, struct regcache *regcache,
void *dst)
{
bfd_byte *valbuf = dst;
int len = TYPE_LENGTH (type);
ULONGEST tmp;
regcache_cooked_read_unsigned (regcache, RET1_REGNUM, &tmp);
store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), tmp);
if (len > 4)
{
regcache_cooked_read_unsigned (regcache, RET1_REGNUM + 1, &tmp);
store_unsigned_integer (valbuf + len - 4, 4, tmp);
}
}
enum return_value_convention
m32r_return_value (struct gdbarch *gdbarch, struct type *valtype,
struct regcache *regcache, void *readbuf,
const void *writebuf)
{
if (TYPE_LENGTH (valtype) > 8)
return RETURN_VALUE_STRUCT_CONVENTION;
else
{
if (readbuf != NULL)
m32r_extract_return_value (valtype, regcache, readbuf);
if (writebuf != NULL)
m32r_store_return_value (valtype, regcache, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
}
static CORE_ADDR
m32r_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, M32R_PC_REGNUM);
}
static void
m32r_frame_this_id (struct frame_info *next_frame,
void **this_prologue_cache, struct frame_id *this_id)
{
struct m32r_unwind_cache *info
= m32r_frame_unwind_cache (next_frame, this_prologue_cache);
CORE_ADDR base;
CORE_ADDR func;
struct minimal_symbol *msym_stack;
struct frame_id id;
func = frame_func_unwind (next_frame);
msym_stack = lookup_minimal_symbol ("_stack", NULL, NULL);
if (msym_stack && info->base == SYMBOL_VALUE_ADDRESS (msym_stack))
return;
base = info->prev_sp;
if (base == 0)
return;
id = frame_id_build (base, func);
(*this_id) = id;
}
static void
m32r_frame_prev_register (struct frame_info *next_frame,
void **this_prologue_cache,
int regnum, enum opt_state *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *bufferp)
{
struct m32r_unwind_cache *info
= m32r_frame_unwind_cache (next_frame, this_prologue_cache);
trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, bufferp);
}
static const struct frame_unwind m32r_frame_unwind = {
NORMAL_FRAME,
m32r_frame_this_id,
m32r_frame_prev_register
};
static const struct frame_unwind *
m32r_frame_sniffer (struct frame_info *next_frame)
{
return &m32r_frame_unwind;
}
static CORE_ADDR
m32r_frame_base_address (struct frame_info *next_frame, void **this_cache)
{
struct m32r_unwind_cache *info
= m32r_frame_unwind_cache (next_frame, this_cache);
return info->base;
}
static const struct frame_base m32r_frame_base = {
&m32r_frame_unwind,
m32r_frame_base_address,
m32r_frame_base_address,
m32r_frame_base_address
};
static struct frame_id
m32r_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_id_build (m32r_unwind_sp (gdbarch, next_frame),
frame_pc_unwind (next_frame));
}
static gdbarch_init_ftype m32r_gdbarch_init;
static struct gdbarch *
m32r_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
tdep = XMALLOC (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
set_gdbarch_read_pc (gdbarch, m32r_read_pc);
set_gdbarch_write_pc (gdbarch, m32r_write_pc);
set_gdbarch_unwind_sp (gdbarch, m32r_unwind_sp);
set_gdbarch_num_regs (gdbarch, M32R_NUM_REGS);
set_gdbarch_sp_regnum (gdbarch, M32R_SP_REGNUM);
set_gdbarch_register_name (gdbarch, m32r_register_name);
set_gdbarch_register_type (gdbarch, m32r_register_type);
set_gdbarch_push_dummy_call (gdbarch, m32r_push_dummy_call);
set_gdbarch_return_value (gdbarch, m32r_return_value);
set_gdbarch_skip_prologue (gdbarch, m32r_skip_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_breakpoint_from_pc (gdbarch, m32r_breakpoint_from_pc);
set_gdbarch_memory_insert_breakpoint (gdbarch,
m32r_memory_insert_breakpoint);
set_gdbarch_memory_remove_breakpoint (gdbarch,
m32r_memory_remove_breakpoint);
set_gdbarch_frame_align (gdbarch, m32r_frame_align);
frame_base_set_default (gdbarch, &m32r_frame_base);
set_gdbarch_unwind_dummy_id (gdbarch, m32r_unwind_dummy_id);
set_gdbarch_unwind_pc (gdbarch, m32r_unwind_pc);
set_gdbarch_print_insn (gdbarch, print_insn_m32r);
gdbarch_init_osabi (info, gdbarch);
frame_unwind_append_sniffer (gdbarch, m32r_frame_sniffer);
return gdbarch;
}
void
_initialize_m32r_tdep (void)
{
register_gdbarch_init (bfd_arch_m32r, m32r_gdbarch_init);
}