4db73d4977
regcache_cooked_read_unsigned instead of read_register. (m68hc11_saved_pc_after_call): Likewise. (m68hc11_pseudo_register_write): Use regcache_cooked_write_unsigned instead of write_register. (m68hc11_register_type): New function. (m68hc11_register_virtual_type): Remove. (m68hc11_store_return_value): Convert to use the regcache. (m68hc11_extract_struct_value_address): Likewise. (m68hc11_gdbarch_init): Remove deprecated ops for register to use m68hc11_register_type; undeprecate store_return_value and extract_struct_value_address.
1436 lines
44 KiB
C
1436 lines
44 KiB
C
/* Target-dependent code for Motorola 68HC11 & 68HC12
|
||
Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
|
||
Contributed by Stephane Carrez, stcarrez@nerim.fr
|
||
|
||
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"
|
||
#include "frame.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "gdbcmd.h"
|
||
#include "gdbcore.h"
|
||
#include "gdb_string.h"
|
||
#include "value.h"
|
||
#include "inferior.h"
|
||
#include "dis-asm.h"
|
||
#include "symfile.h"
|
||
#include "objfiles.h"
|
||
#include "arch-utils.h"
|
||
#include "regcache.h"
|
||
#include "reggroups.h"
|
||
|
||
#include "target.h"
|
||
#include "opcode/m68hc11.h"
|
||
#include "elf/m68hc11.h"
|
||
#include "elf-bfd.h"
|
||
|
||
/* Macros for setting and testing a bit in a minimal symbol.
|
||
For 68HC11/68HC12 we have two flags that tell which return
|
||
type the function is using. This is used for prologue and frame
|
||
analysis to compute correct stack frame layout.
|
||
|
||
The MSB of the minimal symbol's "info" field is used for this purpose.
|
||
This field is already being used to store the symbol size, so the
|
||
assumption is that the symbol size cannot exceed 2^30.
|
||
|
||
MSYMBOL_SET_RTC Actually sets the "RTC" bit.
|
||
MSYMBOL_SET_RTI Actually sets the "RTI" bit.
|
||
MSYMBOL_IS_RTC Tests the "RTC" bit in a minimal symbol.
|
||
MSYMBOL_IS_RTI Tests the "RTC" bit in a minimal symbol.
|
||
MSYMBOL_SIZE Returns the size of the minimal symbol,
|
||
i.e. the "info" field with the "special" bit
|
||
masked out. */
|
||
|
||
#define MSYMBOL_SET_RTC(msym) \
|
||
MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
|
||
| 0x80000000)
|
||
|
||
#define MSYMBOL_SET_RTI(msym) \
|
||
MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
|
||
| 0x40000000)
|
||
|
||
#define MSYMBOL_IS_RTC(msym) \
|
||
(((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
|
||
|
||
#define MSYMBOL_IS_RTI(msym) \
|
||
(((long) MSYMBOL_INFO (msym) & 0x40000000) != 0)
|
||
|
||
#define MSYMBOL_SIZE(msym) \
|
||
((long) MSYMBOL_INFO (msym) & 0x3fffffff)
|
||
|
||
enum insn_return_kind {
|
||
RETURN_RTS,
|
||
RETURN_RTC,
|
||
RETURN_RTI
|
||
};
|
||
|
||
|
||
/* Register numbers of various important registers.
|
||
Note that some of these values are "real" register numbers,
|
||
and correspond to the general registers of the machine,
|
||
and some are "phony" register numbers which are too large
|
||
to be actual register numbers as far as the user is concerned
|
||
but do serve to get the desired values when passed to read_register. */
|
||
|
||
#define HARD_X_REGNUM 0
|
||
#define HARD_D_REGNUM 1
|
||
#define HARD_Y_REGNUM 2
|
||
#define HARD_SP_REGNUM 3
|
||
#define HARD_PC_REGNUM 4
|
||
|
||
#define HARD_A_REGNUM 5
|
||
#define HARD_B_REGNUM 6
|
||
#define HARD_CCR_REGNUM 7
|
||
|
||
/* 68HC12 page number register.
|
||
Note: to keep a compatibility with gcc register naming, we must
|
||
not have to rename FP and other soft registers. The page register
|
||
is a real hard register and must therefore be counted by NUM_REGS.
|
||
For this it has the same number as Z register (which is not used). */
|
||
#define HARD_PAGE_REGNUM 8
|
||
#define M68HC11_LAST_HARD_REG (HARD_PAGE_REGNUM)
|
||
|
||
/* Z is replaced by X or Y by gcc during machine reorg.
|
||
??? There is no way to get it and even know whether
|
||
it's in X or Y or in ZS. */
|
||
#define SOFT_Z_REGNUM 8
|
||
|
||
/* Soft registers. These registers are special. There are treated
|
||
like normal hard registers by gcc and gdb (ie, within dwarf2 info).
|
||
They are physically located in memory. */
|
||
#define SOFT_FP_REGNUM 9
|
||
#define SOFT_TMP_REGNUM 10
|
||
#define SOFT_ZS_REGNUM 11
|
||
#define SOFT_XY_REGNUM 12
|
||
#define SOFT_UNUSED_REGNUM 13
|
||
#define SOFT_D1_REGNUM 14
|
||
#define SOFT_D32_REGNUM (SOFT_D1_REGNUM+31)
|
||
#define M68HC11_MAX_SOFT_REGS 32
|
||
|
||
#define M68HC11_NUM_REGS (8)
|
||
#define M68HC11_NUM_PSEUDO_REGS (M68HC11_MAX_SOFT_REGS+5)
|
||
#define M68HC11_ALL_REGS (M68HC11_NUM_REGS+M68HC11_NUM_PSEUDO_REGS)
|
||
|
||
#define M68HC11_REG_SIZE (2)
|
||
|
||
#define M68HC12_NUM_REGS (9)
|
||
#define M68HC12_NUM_PSEUDO_REGS ((M68HC11_MAX_SOFT_REGS+5)+1-1)
|
||
#define M68HC12_HARD_PC_REGNUM (SOFT_D32_REGNUM+1)
|
||
|
||
struct insn_sequence;
|
||
struct gdbarch_tdep
|
||
{
|
||
/* Stack pointer correction value. For 68hc11, the stack pointer points
|
||
to the next push location. An offset of 1 must be applied to obtain
|
||
the address where the last value is saved. For 68hc12, the stack
|
||
pointer points to the last value pushed. No offset is necessary. */
|
||
int stack_correction;
|
||
|
||
/* Description of instructions in the prologue. */
|
||
struct insn_sequence *prologue;
|
||
|
||
/* True if the page memory bank register is available
|
||
and must be used. */
|
||
int use_page_register;
|
||
|
||
/* ELF flags for ABI. */
|
||
int elf_flags;
|
||
};
|
||
|
||
#define M6811_TDEP gdbarch_tdep (current_gdbarch)
|
||
#define STACK_CORRECTION (M6811_TDEP->stack_correction)
|
||
#define USE_PAGE_REGISTER (M6811_TDEP->use_page_register)
|
||
|
||
struct frame_extra_info
|
||
{
|
||
CORE_ADDR return_pc;
|
||
int frameless;
|
||
int size;
|
||
enum insn_return_kind return_kind;
|
||
};
|
||
|
||
/* Table of registers for 68HC11. This includes the hard registers
|
||
and the soft registers used by GCC. */
|
||
static char *
|
||
m68hc11_register_names[] =
|
||
{
|
||
"x", "d", "y", "sp", "pc", "a", "b",
|
||
"ccr", "page", "frame","tmp", "zs", "xy", 0,
|
||
"d1", "d2", "d3", "d4", "d5", "d6", "d7",
|
||
"d8", "d9", "d10", "d11", "d12", "d13", "d14",
|
||
"d15", "d16", "d17", "d18", "d19", "d20", "d21",
|
||
"d22", "d23", "d24", "d25", "d26", "d27", "d28",
|
||
"d29", "d30", "d31", "d32"
|
||
};
|
||
|
||
struct m68hc11_soft_reg
|
||
{
|
||
const char *name;
|
||
CORE_ADDR addr;
|
||
};
|
||
|
||
static struct m68hc11_soft_reg soft_regs[M68HC11_ALL_REGS];
|
||
|
||
#define M68HC11_FP_ADDR soft_regs[SOFT_FP_REGNUM].addr
|
||
|
||
static int soft_min_addr;
|
||
static int soft_max_addr;
|
||
static int soft_reg_initialized = 0;
|
||
|
||
/* Look in the symbol table for the address of a pseudo register
|
||
in memory. If we don't find it, pretend the register is not used
|
||
and not available. */
|
||
static void
|
||
m68hc11_get_register_info (struct m68hc11_soft_reg *reg, const char *name)
|
||
{
|
||
struct minimal_symbol *msymbol;
|
||
|
||
msymbol = lookup_minimal_symbol (name, NULL, NULL);
|
||
if (msymbol)
|
||
{
|
||
reg->addr = SYMBOL_VALUE_ADDRESS (msymbol);
|
||
reg->name = xstrdup (name);
|
||
|
||
/* Keep track of the address range for soft registers. */
|
||
if (reg->addr < (CORE_ADDR) soft_min_addr)
|
||
soft_min_addr = reg->addr;
|
||
if (reg->addr > (CORE_ADDR) soft_max_addr)
|
||
soft_max_addr = reg->addr;
|
||
}
|
||
else
|
||
{
|
||
reg->name = 0;
|
||
reg->addr = 0;
|
||
}
|
||
}
|
||
|
||
/* Initialize the table of soft register addresses according
|
||
to the symbol table. */
|
||
static void
|
||
m68hc11_initialize_register_info (void)
|
||
{
|
||
int i;
|
||
|
||
if (soft_reg_initialized)
|
||
return;
|
||
|
||
soft_min_addr = INT_MAX;
|
||
soft_max_addr = 0;
|
||
for (i = 0; i < M68HC11_ALL_REGS; i++)
|
||
{
|
||
soft_regs[i].name = 0;
|
||
}
|
||
|
||
m68hc11_get_register_info (&soft_regs[SOFT_FP_REGNUM], "_.frame");
|
||
m68hc11_get_register_info (&soft_regs[SOFT_TMP_REGNUM], "_.tmp");
|
||
m68hc11_get_register_info (&soft_regs[SOFT_ZS_REGNUM], "_.z");
|
||
soft_regs[SOFT_Z_REGNUM] = soft_regs[SOFT_ZS_REGNUM];
|
||
m68hc11_get_register_info (&soft_regs[SOFT_XY_REGNUM], "_.xy");
|
||
|
||
for (i = SOFT_D1_REGNUM; i < M68HC11_MAX_SOFT_REGS; i++)
|
||
{
|
||
char buf[10];
|
||
|
||
sprintf (buf, "_.d%d", i - SOFT_D1_REGNUM + 1);
|
||
m68hc11_get_register_info (&soft_regs[i], buf);
|
||
}
|
||
|
||
if (soft_regs[SOFT_FP_REGNUM].name == 0)
|
||
{
|
||
warning ("No frame soft register found in the symbol table.\n");
|
||
warning ("Stack backtrace will not work.\n");
|
||
}
|
||
soft_reg_initialized = 1;
|
||
}
|
||
|
||
/* Given an address in memory, return the soft register number if
|
||
that address corresponds to a soft register. Returns -1 if not. */
|
||
static int
|
||
m68hc11_which_soft_register (CORE_ADDR addr)
|
||
{
|
||
int i;
|
||
|
||
if (addr < soft_min_addr || addr > soft_max_addr)
|
||
return -1;
|
||
|
||
for (i = SOFT_FP_REGNUM; i < M68HC11_ALL_REGS; i++)
|
||
{
|
||
if (soft_regs[i].name && soft_regs[i].addr == addr)
|
||
return i;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/* Fetch a pseudo register. The 68hc11 soft registers are treated like
|
||
pseudo registers. They are located in memory. Translate the register
|
||
fetch into a memory read. */
|
||
static void
|
||
m68hc11_pseudo_register_read (struct gdbarch *gdbarch,
|
||
struct regcache *regcache,
|
||
int regno, void *buf)
|
||
{
|
||
/* The PC is a pseudo reg only for 68HC12 with the memory bank
|
||
addressing mode. */
|
||
if (regno == M68HC12_HARD_PC_REGNUM)
|
||
{
|
||
ULONGEST pc;
|
||
const int regsize = TYPE_LENGTH (builtin_type_uint32);
|
||
|
||
regcache_cooked_read_unsigned (regcache, HARD_PC_REGNUM, &pc);
|
||
if (pc >= 0x8000 && pc < 0xc000)
|
||
{
|
||
ULONGEST page;
|
||
|
||
regcache_cooked_read_unsigned (regcache, HARD_PAGE_REGNUM, &page);
|
||
pc -= 0x8000;
|
||
pc += (page << 14);
|
||
pc += 0x1000000;
|
||
}
|
||
store_unsigned_integer (buf, regsize, pc);
|
||
return;
|
||
}
|
||
|
||
m68hc11_initialize_register_info ();
|
||
|
||
/* Fetch a soft register: translate into a memory read. */
|
||
if (soft_regs[regno].name)
|
||
{
|
||
target_read_memory (soft_regs[regno].addr, buf, 2);
|
||
}
|
||
else
|
||
{
|
||
memset (buf, 0, 2);
|
||
}
|
||
}
|
||
|
||
/* Store a pseudo register. Translate the register store
|
||
into a memory write. */
|
||
static void
|
||
m68hc11_pseudo_register_write (struct gdbarch *gdbarch,
|
||
struct regcache *regcache,
|
||
int regno, const void *buf)
|
||
{
|
||
/* The PC is a pseudo reg only for 68HC12 with the memory bank
|
||
addressing mode. */
|
||
if (regno == M68HC12_HARD_PC_REGNUM)
|
||
{
|
||
const int regsize = TYPE_LENGTH (builtin_type_uint32);
|
||
char *tmp = alloca (regsize);
|
||
CORE_ADDR pc;
|
||
|
||
memcpy (tmp, buf, regsize);
|
||
pc = extract_unsigned_integer (tmp, regsize);
|
||
if (pc >= 0x1000000)
|
||
{
|
||
pc -= 0x1000000;
|
||
regcache_cooked_write_unsigned (regcache, HARD_PAGE_REGNUM,
|
||
(pc >> 14) & 0x0ff);
|
||
pc &= 0x03fff;
|
||
regcache_cooked_write_unsigned (regcache, HARD_PC_REGNUM,
|
||
pc + 0x8000);
|
||
}
|
||
else
|
||
regcache_cooked_write_unsigned (regcache, HARD_PC_REGNUM, pc);
|
||
return;
|
||
}
|
||
|
||
m68hc11_initialize_register_info ();
|
||
|
||
/* Store a soft register: translate into a memory write. */
|
||
if (soft_regs[regno].name)
|
||
{
|
||
const int regsize = 2;
|
||
char *tmp = alloca (regsize);
|
||
memcpy (tmp, buf, regsize);
|
||
target_write_memory (soft_regs[regno].addr, tmp, regsize);
|
||
}
|
||
}
|
||
|
||
static const char *
|
||
m68hc11_register_name (int reg_nr)
|
||
{
|
||
if (reg_nr == M68HC12_HARD_PC_REGNUM && USE_PAGE_REGISTER)
|
||
return "pc";
|
||
if (reg_nr == HARD_PC_REGNUM && USE_PAGE_REGISTER)
|
||
return "ppc";
|
||
|
||
if (reg_nr < 0)
|
||
return NULL;
|
||
if (reg_nr >= M68HC11_ALL_REGS)
|
||
return NULL;
|
||
|
||
/* If we don't know the address of a soft register, pretend it
|
||
does not exist. */
|
||
if (reg_nr > M68HC11_LAST_HARD_REG && soft_regs[reg_nr].name == 0)
|
||
return NULL;
|
||
return m68hc11_register_names[reg_nr];
|
||
}
|
||
|
||
static const unsigned char *
|
||
m68hc11_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
|
||
{
|
||
static unsigned char breakpoint[] = {0x0};
|
||
|
||
*lenptr = sizeof (breakpoint);
|
||
return breakpoint;
|
||
}
|
||
|
||
/* Immediately after a function call, return the saved pc before the frame
|
||
is setup. */
|
||
|
||
static CORE_ADDR
|
||
m68hc11_saved_pc_after_call (struct frame_info *frame)
|
||
{
|
||
CORE_ADDR addr;
|
||
ULONGEST sp;
|
||
|
||
regcache_cooked_read_unsigned (current_regcache, HARD_SP_REGNUM, &sp);
|
||
sp += STACK_CORRECTION;
|
||
addr = sp & 0x0ffff;
|
||
return read_memory_integer (addr, 2) & 0x0FFFF;
|
||
}
|
||
|
||
static CORE_ADDR
|
||
m68hc11_frame_saved_pc (struct frame_info *frame)
|
||
{
|
||
return get_frame_extra_info (frame)->return_pc;
|
||
}
|
||
|
||
static CORE_ADDR
|
||
m68hc11_frame_args_address (struct frame_info *frame)
|
||
{
|
||
CORE_ADDR addr;
|
||
|
||
addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION + 2;
|
||
if (get_frame_extra_info (frame)->return_kind == RETURN_RTC)
|
||
addr += 1;
|
||
else if (get_frame_extra_info (frame)->return_kind == RETURN_RTI)
|
||
addr += 7;
|
||
|
||
return addr;
|
||
}
|
||
|
||
/* Discard from the stack the innermost frame, restoring all saved
|
||
registers. */
|
||
|
||
static void
|
||
m68hc11_pop_frame (void)
|
||
{
|
||
register struct frame_info *frame = get_current_frame ();
|
||
register CORE_ADDR fp, sp;
|
||
register int regnum;
|
||
|
||
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
|
||
get_frame_base (frame),
|
||
get_frame_base (frame)))
|
||
generic_pop_dummy_frame ();
|
||
else
|
||
{
|
||
fp = get_frame_base (frame);
|
||
DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
|
||
|
||
/* Copy regs from where they were saved in the frame. */
|
||
for (regnum = 0; regnum < M68HC11_ALL_REGS; regnum++)
|
||
if (get_frame_saved_regs (frame)[regnum])
|
||
write_register (regnum,
|
||
read_memory_integer (get_frame_saved_regs (frame)[regnum], 2));
|
||
|
||
write_register (HARD_PC_REGNUM, get_frame_extra_info (frame)->return_pc);
|
||
sp = (fp + get_frame_extra_info (frame)->size + 2) & 0x0ffff;
|
||
write_register (HARD_SP_REGNUM, sp);
|
||
}
|
||
flush_cached_frames ();
|
||
}
|
||
|
||
|
||
/* 68HC11 & 68HC12 prologue analysis.
|
||
|
||
*/
|
||
#define MAX_CODES 12
|
||
|
||
/* 68HC11 opcodes. */
|
||
#undef M6811_OP_PAGE2
|
||
#define M6811_OP_PAGE2 (0x18)
|
||
#define M6811_OP_LDX (0xde)
|
||
#define M6811_OP_LDX_EXT (0xfe)
|
||
#define M6811_OP_PSHX (0x3c)
|
||
#define M6811_OP_STS (0x9f)
|
||
#define M6811_OP_STS_EXT (0xbf)
|
||
#define M6811_OP_TSX (0x30)
|
||
#define M6811_OP_XGDX (0x8f)
|
||
#define M6811_OP_ADDD (0xc3)
|
||
#define M6811_OP_TXS (0x35)
|
||
#define M6811_OP_DES (0x34)
|
||
|
||
/* 68HC12 opcodes. */
|
||
#define M6812_OP_PAGE2 (0x18)
|
||
#define M6812_OP_MOVW (0x01)
|
||
#define M6812_PB_PSHW (0xae)
|
||
#define M6812_OP_STS (0x5f)
|
||
#define M6812_OP_STS_EXT (0x7f)
|
||
#define M6812_OP_LEAS (0x1b)
|
||
#define M6812_OP_PSHX (0x34)
|
||
#define M6812_OP_PSHY (0x35)
|
||
|
||
/* Operand extraction. */
|
||
#define OP_DIRECT (0x100) /* 8-byte direct addressing. */
|
||
#define OP_IMM_LOW (0x200) /* Low part of 16-bit constant/address. */
|
||
#define OP_IMM_HIGH (0x300) /* High part of 16-bit constant/address. */
|
||
#define OP_PBYTE (0x400) /* 68HC12 indexed operand. */
|
||
|
||
/* Identification of the sequence. */
|
||
enum m6811_seq_type
|
||
{
|
||
P_LAST = 0,
|
||
P_SAVE_REG, /* Save a register on the stack. */
|
||
P_SET_FRAME, /* Setup the frame pointer. */
|
||
P_LOCAL_1, /* Allocate 1 byte for locals. */
|
||
P_LOCAL_2, /* Allocate 2 bytes for locals. */
|
||
P_LOCAL_N /* Allocate N bytes for locals. */
|
||
};
|
||
|
||
struct insn_sequence {
|
||
enum m6811_seq_type type;
|
||
unsigned length;
|
||
unsigned short code[MAX_CODES];
|
||
};
|
||
|
||
/* Sequence of instructions in the 68HC11 function prologue. */
|
||
static struct insn_sequence m6811_prologue[] = {
|
||
/* Sequences to save a soft-register. */
|
||
{ P_SAVE_REG, 3, { M6811_OP_LDX, OP_DIRECT,
|
||
M6811_OP_PSHX } },
|
||
{ P_SAVE_REG, 5, { M6811_OP_PAGE2, M6811_OP_LDX, OP_DIRECT,
|
||
M6811_OP_PAGE2, M6811_OP_PSHX } },
|
||
{ P_SAVE_REG, 4, { M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW,
|
||
M6811_OP_PSHX } },
|
||
{ P_SAVE_REG, 6, { M6811_OP_PAGE2, M6811_OP_LDX_EXT, OP_IMM_HIGH, OP_IMM_LOW,
|
||
M6811_OP_PAGE2, M6811_OP_PSHX } },
|
||
|
||
/* Sequences to allocate local variables. */
|
||
{ P_LOCAL_N, 7, { M6811_OP_TSX,
|
||
M6811_OP_XGDX,
|
||
M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW,
|
||
M6811_OP_XGDX,
|
||
M6811_OP_TXS } },
|
||
{ P_LOCAL_N, 11, { M6811_OP_PAGE2, M6811_OP_TSX,
|
||
M6811_OP_PAGE2, M6811_OP_XGDX,
|
||
M6811_OP_ADDD, OP_IMM_HIGH, OP_IMM_LOW,
|
||
M6811_OP_PAGE2, M6811_OP_XGDX,
|
||
M6811_OP_PAGE2, M6811_OP_TXS } },
|
||
{ P_LOCAL_1, 1, { M6811_OP_DES } },
|
||
{ P_LOCAL_2, 1, { M6811_OP_PSHX } },
|
||
{ P_LOCAL_2, 2, { M6811_OP_PAGE2, M6811_OP_PSHX } },
|
||
|
||
/* Initialize the frame pointer. */
|
||
{ P_SET_FRAME, 2, { M6811_OP_STS, OP_DIRECT } },
|
||
{ P_SET_FRAME, 3, { M6811_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } },
|
||
{ P_LAST, 0, { 0 } }
|
||
};
|
||
|
||
|
||
/* Sequence of instructions in the 68HC12 function prologue. */
|
||
static struct insn_sequence m6812_prologue[] = {
|
||
{ P_SAVE_REG, 5, { M6812_OP_PAGE2, M6812_OP_MOVW, M6812_PB_PSHW,
|
||
OP_IMM_HIGH, OP_IMM_LOW } },
|
||
{ P_SET_FRAME, 2, { M6812_OP_STS, OP_DIRECT } },
|
||
{ P_SET_FRAME, 3, { M6812_OP_STS_EXT, OP_IMM_HIGH, OP_IMM_LOW } },
|
||
{ P_LOCAL_N, 2, { M6812_OP_LEAS, OP_PBYTE } },
|
||
{ P_LOCAL_2, 1, { M6812_OP_PSHX } },
|
||
{ P_LOCAL_2, 1, { M6812_OP_PSHY } },
|
||
{ P_LAST, 0 }
|
||
};
|
||
|
||
|
||
/* Analyze the sequence of instructions starting at the given address.
|
||
Returns a pointer to the sequence when it is recognized and
|
||
the optional value (constant/address) associated with it.
|
||
Advance the pc for the next sequence. */
|
||
static struct insn_sequence *
|
||
m68hc11_analyze_instruction (struct insn_sequence *seq, CORE_ADDR *pc,
|
||
CORE_ADDR *val)
|
||
{
|
||
unsigned char buffer[MAX_CODES];
|
||
unsigned bufsize;
|
||
unsigned j;
|
||
CORE_ADDR cur_val;
|
||
short v = 0;
|
||
|
||
bufsize = 0;
|
||
for (; seq->type != P_LAST; seq++)
|
||
{
|
||
cur_val = 0;
|
||
for (j = 0; j < seq->length; j++)
|
||
{
|
||
if (bufsize < j + 1)
|
||
{
|
||
buffer[bufsize] = read_memory_unsigned_integer (*pc + bufsize,
|
||
1);
|
||
bufsize++;
|
||
}
|
||
/* Continue while we match the opcode. */
|
||
if (seq->code[j] == buffer[j])
|
||
continue;
|
||
|
||
if ((seq->code[j] & 0xf00) == 0)
|
||
break;
|
||
|
||
/* Extract a sequence parameter (address or constant). */
|
||
switch (seq->code[j])
|
||
{
|
||
case OP_DIRECT:
|
||
cur_val = (CORE_ADDR) buffer[j];
|
||
break;
|
||
|
||
case OP_IMM_HIGH:
|
||
cur_val = cur_val & 0x0ff;
|
||
cur_val |= (buffer[j] << 8);
|
||
break;
|
||
|
||
case OP_IMM_LOW:
|
||
cur_val &= 0x0ff00;
|
||
cur_val |= buffer[j];
|
||
break;
|
||
|
||
case OP_PBYTE:
|
||
if ((buffer[j] & 0xE0) == 0x80)
|
||
{
|
||
v = buffer[j] & 0x1f;
|
||
if (v & 0x10)
|
||
v |= 0xfff0;
|
||
}
|
||
else if ((buffer[j] & 0xfe) == 0xf0)
|
||
{
|
||
v = read_memory_unsigned_integer (*pc + j + 1, 1);
|
||
if (buffer[j] & 1)
|
||
v |= 0xff00;
|
||
*pc = *pc + 1;
|
||
}
|
||
else if (buffer[j] == 0xf2)
|
||
{
|
||
v = read_memory_unsigned_integer (*pc + j + 1, 2);
|
||
*pc = *pc + 2;
|
||
}
|
||
cur_val = v;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* We have a full match. */
|
||
if (j == seq->length)
|
||
{
|
||
*val = cur_val;
|
||
*pc = *pc + j;
|
||
return seq;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Return the instruction that the function at the PC is using. */
|
||
static enum insn_return_kind
|
||
m68hc11_get_return_insn (CORE_ADDR pc)
|
||
{
|
||
struct minimal_symbol *sym;
|
||
|
||
/* A flag indicating that this is a STO_M68HC12_FAR or STO_M68HC12_INTERRUPT
|
||
function is stored by elfread.c in the high bit of the info field.
|
||
Use this to decide which instruction the function uses to return. */
|
||
sym = lookup_minimal_symbol_by_pc (pc);
|
||
if (sym == 0)
|
||
return RETURN_RTS;
|
||
|
||
if (MSYMBOL_IS_RTC (sym))
|
||
return RETURN_RTC;
|
||
else if (MSYMBOL_IS_RTI (sym))
|
||
return RETURN_RTI;
|
||
else
|
||
return RETURN_RTS;
|
||
}
|
||
|
||
|
||
/* Analyze the function prologue to find some information
|
||
about the function:
|
||
- the PC of the first line (for m68hc11_skip_prologue)
|
||
- the offset of the previous frame saved address (from current frame)
|
||
- the soft registers which are pushed. */
|
||
static void
|
||
m68hc11_guess_from_prologue (CORE_ADDR pc, CORE_ADDR fp,
|
||
CORE_ADDR *first_line,
|
||
int *frame_offset, CORE_ADDR *pushed_regs)
|
||
{
|
||
CORE_ADDR save_addr;
|
||
CORE_ADDR func_end;
|
||
int size;
|
||
int found_frame_point;
|
||
int saved_reg;
|
||
CORE_ADDR first_pc;
|
||
int done = 0;
|
||
struct insn_sequence *seq_table;
|
||
|
||
first_pc = get_pc_function_start (pc);
|
||
size = 0;
|
||
|
||
m68hc11_initialize_register_info ();
|
||
if (first_pc == 0)
|
||
{
|
||
*frame_offset = 0;
|
||
*first_line = pc;
|
||
return;
|
||
}
|
||
|
||
seq_table = gdbarch_tdep (current_gdbarch)->prologue;
|
||
|
||
/* The 68hc11 stack is as follows:
|
||
|
||
|
||
| |
|
||
+-----------+
|
||
| |
|
||
| args |
|
||
| |
|
||
+-----------+
|
||
| PC-return |
|
||
+-----------+
|
||
| Old frame |
|
||
+-----------+
|
||
| |
|
||
| Locals |
|
||
| |
|
||
+-----------+ <--- current frame
|
||
| |
|
||
|
||
With most processors (like 68K) the previous frame can be computed
|
||
easily because it is always at a fixed offset (see link/unlink).
|
||
That is, locals are accessed with negative offsets, arguments are
|
||
accessed with positive ones. Since 68hc11 only supports offsets
|
||
in the range [0..255], the frame is defined at the bottom of
|
||
locals (see picture).
|
||
|
||
The purpose of the analysis made here is to find out the size
|
||
of locals in this function. An alternative to this is to use
|
||
DWARF2 info. This would be better but I don't know how to
|
||
access dwarf2 debug from this function.
|
||
|
||
Walk from the function entry point to the point where we save
|
||
the frame. While walking instructions, compute the size of bytes
|
||
which are pushed. This gives us the index to access the previous
|
||
frame.
|
||
|
||
We limit the search to 128 bytes so that the algorithm is bounded
|
||
in case of random and wrong code. We also stop and abort if
|
||
we find an instruction which is not supposed to appear in the
|
||
prologue (as generated by gcc 2.95, 2.96).
|
||
*/
|
||
pc = first_pc;
|
||
func_end = pc + 128;
|
||
found_frame_point = 0;
|
||
*frame_offset = 0;
|
||
save_addr = fp + STACK_CORRECTION;
|
||
while (!done && pc + 2 < func_end)
|
||
{
|
||
struct insn_sequence *seq;
|
||
CORE_ADDR val;
|
||
|
||
seq = m68hc11_analyze_instruction (seq_table, &pc, &val);
|
||
if (seq == 0)
|
||
break;
|
||
|
||
if (seq->type == P_SAVE_REG)
|
||
{
|
||
if (found_frame_point)
|
||
{
|
||
saved_reg = m68hc11_which_soft_register (val);
|
||
if (saved_reg < 0)
|
||
break;
|
||
|
||
save_addr -= 2;
|
||
if (pushed_regs)
|
||
pushed_regs[saved_reg] = save_addr;
|
||
}
|
||
else
|
||
{
|
||
size += 2;
|
||
}
|
||
}
|
||
else if (seq->type == P_SET_FRAME)
|
||
{
|
||
found_frame_point = 1;
|
||
*frame_offset = size;
|
||
}
|
||
else if (seq->type == P_LOCAL_1)
|
||
{
|
||
size += 1;
|
||
}
|
||
else if (seq->type == P_LOCAL_2)
|
||
{
|
||
size += 2;
|
||
}
|
||
else if (seq->type == P_LOCAL_N)
|
||
{
|
||
/* Stack pointer is decremented for the allocation. */
|
||
if (val & 0x8000)
|
||
size -= (int) (val) | 0xffff0000;
|
||
else
|
||
size -= val;
|
||
}
|
||
}
|
||
*first_line = pc;
|
||
}
|
||
|
||
static CORE_ADDR
|
||
m68hc11_skip_prologue (CORE_ADDR pc)
|
||
{
|
||
CORE_ADDR func_addr, func_end;
|
||
struct symtab_and_line sal;
|
||
int frame_offset;
|
||
|
||
/* If we have line debugging information, then the end of the
|
||
prologue should be the first assembly instruction of the
|
||
first source line. */
|
||
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
|
||
{
|
||
sal = find_pc_line (func_addr, 0);
|
||
if (sal.end && sal.end < func_end)
|
||
return sal.end;
|
||
}
|
||
|
||
m68hc11_guess_from_prologue (pc, 0, &pc, &frame_offset, 0);
|
||
return pc;
|
||
}
|
||
|
||
/* 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 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
|
||
will be called for the new frame. */
|
||
|
||
static CORE_ADDR
|
||
m68hc11_frame_chain (struct frame_info *frame)
|
||
{
|
||
CORE_ADDR addr;
|
||
|
||
if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
|
||
get_frame_base (frame),
|
||
get_frame_base (frame)))
|
||
return get_frame_base (frame); /* dummy frame same as caller's frame */
|
||
|
||
if (get_frame_extra_info (frame)->return_pc == 0
|
||
|| inside_entry_file (get_frame_extra_info (frame)->return_pc))
|
||
return (CORE_ADDR) 0;
|
||
|
||
if (get_frame_base (frame) == 0)
|
||
{
|
||
return (CORE_ADDR) 0;
|
||
}
|
||
|
||
addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION - 2;
|
||
addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF;
|
||
return addr;
|
||
}
|
||
|
||
/* 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. */
|
||
static void
|
||
m68hc11_frame_init_saved_regs (struct frame_info *fi)
|
||
{
|
||
CORE_ADDR pc;
|
||
CORE_ADDR addr;
|
||
|
||
if (get_frame_saved_regs (fi) == NULL)
|
||
frame_saved_regs_zalloc (fi);
|
||
else
|
||
memset (get_frame_saved_regs (fi), 0, SIZEOF_FRAME_SAVED_REGS);
|
||
|
||
pc = get_frame_pc (fi);
|
||
get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (pc);
|
||
m68hc11_guess_from_prologue (pc, get_frame_base (fi), &pc,
|
||
&get_frame_extra_info (fi)->size,
|
||
get_frame_saved_regs (fi));
|
||
|
||
addr = get_frame_base (fi) + get_frame_extra_info (fi)->size + STACK_CORRECTION;
|
||
if (soft_regs[SOFT_FP_REGNUM].name)
|
||
get_frame_saved_regs (fi)[SOFT_FP_REGNUM] = addr - 2;
|
||
|
||
/* Take into account how the function was called/returns. */
|
||
if (get_frame_extra_info (fi)->return_kind == RETURN_RTC)
|
||
{
|
||
get_frame_saved_regs (fi)[HARD_PAGE_REGNUM] = addr;
|
||
addr++;
|
||
}
|
||
else if (get_frame_extra_info (fi)->return_kind == RETURN_RTI)
|
||
{
|
||
get_frame_saved_regs (fi)[HARD_CCR_REGNUM] = addr;
|
||
get_frame_saved_regs (fi)[HARD_D_REGNUM] = addr + 1;
|
||
get_frame_saved_regs (fi)[HARD_X_REGNUM] = addr + 3;
|
||
get_frame_saved_regs (fi)[HARD_Y_REGNUM] = addr + 5;
|
||
addr += 7;
|
||
}
|
||
get_frame_saved_regs (fi)[HARD_SP_REGNUM] = addr;
|
||
get_frame_saved_regs (fi)[HARD_PC_REGNUM] = get_frame_saved_regs (fi)[HARD_SP_REGNUM];
|
||
}
|
||
|
||
static void
|
||
m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi)
|
||
{
|
||
CORE_ADDR addr;
|
||
|
||
frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
|
||
|
||
if (get_next_frame (fi))
|
||
deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));
|
||
|
||
m68hc11_frame_init_saved_regs (fi);
|
||
|
||
if (fromleaf)
|
||
{
|
||
get_frame_extra_info (fi)->return_kind = m68hc11_get_return_insn (get_frame_pc (fi));
|
||
get_frame_extra_info (fi)->return_pc = m68hc11_saved_pc_after_call (fi);
|
||
}
|
||
else
|
||
{
|
||
addr = get_frame_saved_regs (fi)[HARD_PC_REGNUM];
|
||
addr = read_memory_unsigned_integer (addr, 2) & 0x0ffff;
|
||
|
||
/* Take into account the 68HC12 specific call (PC + page). */
|
||
if (get_frame_extra_info (fi)->return_kind == RETURN_RTC
|
||
&& addr >= 0x08000 && addr < 0x0c000
|
||
&& USE_PAGE_REGISTER)
|
||
{
|
||
CORE_ADDR page_addr = get_frame_saved_regs (fi)[HARD_PAGE_REGNUM];
|
||
|
||
unsigned page = read_memory_unsigned_integer (page_addr, 1);
|
||
addr -= 0x08000;
|
||
addr += ((page & 0x0ff) << 14);
|
||
addr += 0x1000000;
|
||
}
|
||
get_frame_extra_info (fi)->return_pc = addr;
|
||
}
|
||
}
|
||
|
||
/* Same as 'info reg' but prints the registers in a different way. */
|
||
static void
|
||
show_regs (char *args, int from_tty)
|
||
{
|
||
int ccr = read_register (HARD_CCR_REGNUM);
|
||
int i;
|
||
int nr;
|
||
|
||
printf_filtered ("PC=%04x SP=%04x FP=%04x CCR=%02x %c%c%c%c%c%c%c%c\n",
|
||
(int) read_register (HARD_PC_REGNUM),
|
||
(int) read_register (HARD_SP_REGNUM),
|
||
(int) read_register (SOFT_FP_REGNUM),
|
||
ccr,
|
||
ccr & M6811_S_BIT ? 'S' : '-',
|
||
ccr & M6811_X_BIT ? 'X' : '-',
|
||
ccr & M6811_H_BIT ? 'H' : '-',
|
||
ccr & M6811_I_BIT ? 'I' : '-',
|
||
ccr & M6811_N_BIT ? 'N' : '-',
|
||
ccr & M6811_Z_BIT ? 'Z' : '-',
|
||
ccr & M6811_V_BIT ? 'V' : '-',
|
||
ccr & M6811_C_BIT ? 'C' : '-');
|
||
|
||
printf_filtered ("D=%04x IX=%04x IY=%04x",
|
||
(int) read_register (HARD_D_REGNUM),
|
||
(int) read_register (HARD_X_REGNUM),
|
||
(int) read_register (HARD_Y_REGNUM));
|
||
|
||
if (USE_PAGE_REGISTER)
|
||
{
|
||
printf_filtered (" Page=%02x",
|
||
(int) read_register (HARD_PAGE_REGNUM));
|
||
}
|
||
printf_filtered ("\n");
|
||
|
||
nr = 0;
|
||
for (i = SOFT_D1_REGNUM; i < M68HC11_ALL_REGS; i++)
|
||
{
|
||
/* Skip registers which are not defined in the symbol table. */
|
||
if (soft_regs[i].name == 0)
|
||
continue;
|
||
|
||
printf_filtered ("D%d=%04x",
|
||
i - SOFT_D1_REGNUM + 1,
|
||
(int) read_register (i));
|
||
nr++;
|
||
if ((nr % 8) == 7)
|
||
printf_filtered ("\n");
|
||
else
|
||
printf_filtered (" ");
|
||
}
|
||
if (nr && (nr % 8) != 7)
|
||
printf_filtered ("\n");
|
||
}
|
||
|
||
static CORE_ADDR
|
||
m68hc11_stack_align (CORE_ADDR addr)
|
||
{
|
||
return ((addr + 1) & -2);
|
||
}
|
||
|
||
static CORE_ADDR
|
||
m68hc11_push_arguments (int nargs,
|
||
struct value **args,
|
||
CORE_ADDR sp,
|
||
int struct_return,
|
||
CORE_ADDR struct_addr)
|
||
{
|
||
int stack_alloc;
|
||
int argnum;
|
||
int first_stack_argnum;
|
||
int stack_offset;
|
||
struct type *type;
|
||
char *val;
|
||
int len;
|
||
|
||
stack_alloc = 0;
|
||
first_stack_argnum = 0;
|
||
if (struct_return)
|
||
{
|
||
/* The struct is allocated on the stack and gdb used the stack
|
||
pointer for the address of that struct. We must apply the
|
||
stack offset on the address. */
|
||
write_register (HARD_D_REGNUM, struct_addr + STACK_CORRECTION);
|
||
}
|
||
else if (nargs > 0)
|
||
{
|
||
type = VALUE_TYPE (args[0]);
|
||
len = TYPE_LENGTH (type);
|
||
|
||
/* First argument is passed in D and X registers. */
|
||
if (len <= 4)
|
||
{
|
||
LONGEST v = extract_unsigned_integer (VALUE_CONTENTS (args[0]), len);
|
||
first_stack_argnum = 1;
|
||
write_register (HARD_D_REGNUM, v);
|
||
if (len > 2)
|
||
{
|
||
v >>= 16;
|
||
write_register (HARD_X_REGNUM, v);
|
||
}
|
||
}
|
||
}
|
||
for (argnum = first_stack_argnum; argnum < nargs; argnum++)
|
||
{
|
||
type = VALUE_TYPE (args[argnum]);
|
||
stack_alloc += (TYPE_LENGTH (type) + 1) & -2;
|
||
}
|
||
sp -= stack_alloc;
|
||
|
||
stack_offset = STACK_CORRECTION;
|
||
for (argnum = first_stack_argnum; argnum < nargs; argnum++)
|
||
{
|
||
type = VALUE_TYPE (args[argnum]);
|
||
len = TYPE_LENGTH (type);
|
||
|
||
val = (char*) VALUE_CONTENTS (args[argnum]);
|
||
write_memory (sp + stack_offset, val, len);
|
||
stack_offset += len;
|
||
if (len & 1)
|
||
{
|
||
static char zero = 0;
|
||
|
||
write_memory (sp + stack_offset, &zero, 1);
|
||
stack_offset++;
|
||
}
|
||
}
|
||
return sp;
|
||
}
|
||
|
||
|
||
/* Return the GDB type object for the "standard" data type
|
||
of data in register N. */
|
||
|
||
static struct type *
|
||
m68hc11_register_type (struct gdbarch *gdbarch, int reg_nr)
|
||
{
|
||
switch (reg_nr)
|
||
{
|
||
case HARD_PAGE_REGNUM:
|
||
case HARD_A_REGNUM:
|
||
case HARD_B_REGNUM:
|
||
case HARD_CCR_REGNUM:
|
||
return builtin_type_uint8;
|
||
|
||
case M68HC12_HARD_PC_REGNUM:
|
||
return builtin_type_uint32;
|
||
|
||
default:
|
||
return builtin_type_uint16;
|
||
}
|
||
}
|
||
|
||
static void
|
||
m68hc11_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
|
||
{
|
||
/* The struct address computed by gdb is on the stack.
|
||
It uses the stack pointer so we must apply the stack
|
||
correction offset. */
|
||
write_register (HARD_D_REGNUM, addr + STACK_CORRECTION);
|
||
}
|
||
|
||
static void
|
||
m68hc11_store_return_value (struct type *type, struct regcache *regcache,
|
||
const void *valbuf)
|
||
{
|
||
int len;
|
||
|
||
len = TYPE_LENGTH (type);
|
||
|
||
/* First argument is passed in D and X registers. */
|
||
if (len <= 2)
|
||
regcache_raw_write_part (regcache, HARD_D_REGNUM, 2 - len, len, valbuf);
|
||
else if (len <= 4)
|
||
{
|
||
regcache_raw_write_part (regcache, HARD_X_REGNUM, 4 - len,
|
||
len - 2, valbuf);
|
||
regcache_raw_write (regcache, HARD_D_REGNUM, (char*) valbuf + (len - 2));
|
||
}
|
||
else
|
||
error ("return of value > 4 is not supported.");
|
||
}
|
||
|
||
|
||
/* Given a return value in `regcache' with a type `type',
|
||
extract and copy its value into `valbuf'. */
|
||
|
||
static void
|
||
m68hc11_extract_return_value (struct type *type, struct regcache *regcache,
|
||
void *valbuf)
|
||
{
|
||
int len = TYPE_LENGTH (type);
|
||
char buf[M68HC11_REG_SIZE];
|
||
|
||
regcache_raw_read (regcache, HARD_D_REGNUM, buf);
|
||
switch (len)
|
||
{
|
||
case 1:
|
||
memcpy (valbuf, buf + 1, 1);
|
||
break;
|
||
|
||
case 2:
|
||
memcpy (valbuf, buf, 2);
|
||
break;
|
||
|
||
case 3:
|
||
memcpy ((char*) valbuf + 1, buf, 2);
|
||
regcache_raw_read (regcache, HARD_X_REGNUM, buf);
|
||
memcpy (valbuf, buf + 1, 1);
|
||
break;
|
||
|
||
case 4:
|
||
memcpy ((char*) valbuf + 2, buf, 2);
|
||
regcache_raw_read (regcache, HARD_X_REGNUM, buf);
|
||
memcpy (valbuf, buf, 2);
|
||
break;
|
||
|
||
default:
|
||
error ("bad size for return value");
|
||
}
|
||
}
|
||
|
||
/* Should call_function allocate stack space for a struct return? */
|
||
static int
|
||
m68hc11_use_struct_convention (int gcc_p, struct type *type)
|
||
{
|
||
return (TYPE_CODE (type) == TYPE_CODE_STRUCT
|
||
|| TYPE_CODE (type) == TYPE_CODE_UNION
|
||
|| TYPE_LENGTH (type) > 4);
|
||
}
|
||
|
||
static int
|
||
m68hc11_return_value_on_stack (struct type *type)
|
||
{
|
||
return TYPE_LENGTH (type) > 4;
|
||
}
|
||
|
||
/* Extract from an array REGBUF containing the (raw) register state
|
||
the address in which a function should return its structure value,
|
||
as a CORE_ADDR (or an expression that can be used as one). */
|
||
static CORE_ADDR
|
||
m68hc11_extract_struct_value_address (struct regcache *regcache)
|
||
{
|
||
char buf[M68HC11_REG_SIZE];
|
||
|
||
regcache_cooked_read (regcache, HARD_D_REGNUM, buf);
|
||
return extract_unsigned_integer (buf, M68HC11_REG_SIZE);
|
||
}
|
||
|
||
/* Function: push_return_address (pc)
|
||
Set up the return address for the inferior function call.
|
||
Needed for targets where we don't actually execute a JSR/BSR instruction */
|
||
|
||
static CORE_ADDR
|
||
m68hc11_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
|
||
{
|
||
char valbuf[2];
|
||
|
||
pc = CALL_DUMMY_ADDRESS ();
|
||
sp -= 2;
|
||
store_unsigned_integer (valbuf, 2, pc);
|
||
write_memory (sp + STACK_CORRECTION, valbuf, 2);
|
||
return sp;
|
||
}
|
||
|
||
/* Test whether the ELF symbol corresponds to a function using rtc or
|
||
rti to return. */
|
||
|
||
static void
|
||
m68hc11_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym)
|
||
{
|
||
unsigned char flags;
|
||
|
||
flags = ((elf_symbol_type *)sym)->internal_elf_sym.st_other;
|
||
if (flags & STO_M68HC12_FAR)
|
||
MSYMBOL_SET_RTC (msym);
|
||
if (flags & STO_M68HC12_INTERRUPT)
|
||
MSYMBOL_SET_RTI (msym);
|
||
}
|
||
|
||
static int
|
||
gdb_print_insn_m68hc11 (bfd_vma memaddr, disassemble_info *info)
|
||
{
|
||
if (TARGET_ARCHITECTURE->arch == bfd_arch_m68hc11)
|
||
return print_insn_m68hc11 (memaddr, info);
|
||
else
|
||
return print_insn_m68hc12 (memaddr, info);
|
||
}
|
||
|
||
|
||
|
||
/* 68HC11/68HC12 register groups.
|
||
Identify real hard registers and soft registers used by gcc. */
|
||
|
||
static struct reggroup *m68hc11_soft_reggroup;
|
||
static struct reggroup *m68hc11_hard_reggroup;
|
||
|
||
static void
|
||
m68hc11_init_reggroups (void)
|
||
{
|
||
m68hc11_hard_reggroup = reggroup_new ("hard", USER_REGGROUP);
|
||
m68hc11_soft_reggroup = reggroup_new ("soft", USER_REGGROUP);
|
||
}
|
||
|
||
static void
|
||
m68hc11_add_reggroups (struct gdbarch *gdbarch)
|
||
{
|
||
reggroup_add (gdbarch, m68hc11_hard_reggroup);
|
||
reggroup_add (gdbarch, m68hc11_soft_reggroup);
|
||
reggroup_add (gdbarch, general_reggroup);
|
||
reggroup_add (gdbarch, float_reggroup);
|
||
reggroup_add (gdbarch, all_reggroup);
|
||
reggroup_add (gdbarch, save_reggroup);
|
||
reggroup_add (gdbarch, restore_reggroup);
|
||
reggroup_add (gdbarch, vector_reggroup);
|
||
reggroup_add (gdbarch, system_reggroup);
|
||
}
|
||
|
||
static int
|
||
m68hc11_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
|
||
struct reggroup *group)
|
||
{
|
||
/* We must save the real hard register as well as gcc
|
||
soft registers including the frame pointer. */
|
||
if (group == save_reggroup || group == restore_reggroup)
|
||
{
|
||
return (regnum <= gdbarch_num_regs (gdbarch)
|
||
|| ((regnum == SOFT_FP_REGNUM
|
||
|| regnum == SOFT_TMP_REGNUM
|
||
|| regnum == SOFT_ZS_REGNUM
|
||
|| regnum == SOFT_XY_REGNUM)
|
||
&& m68hc11_register_name (regnum)));
|
||
}
|
||
|
||
/* Group to identify gcc soft registers (d1..dN). */
|
||
if (group == m68hc11_soft_reggroup)
|
||
{
|
||
return regnum >= SOFT_D1_REGNUM && m68hc11_register_name (regnum);
|
||
}
|
||
|
||
if (group == m68hc11_hard_reggroup)
|
||
{
|
||
return regnum == HARD_PC_REGNUM || regnum == HARD_SP_REGNUM
|
||
|| regnum == HARD_X_REGNUM || regnum == HARD_D_REGNUM
|
||
|| regnum == HARD_Y_REGNUM || regnum == HARD_CCR_REGNUM;
|
||
}
|
||
return default_register_reggroup_p (gdbarch, regnum, group);
|
||
}
|
||
|
||
static struct gdbarch *
|
||
m68hc11_gdbarch_init (struct gdbarch_info info,
|
||
struct gdbarch_list *arches)
|
||
{
|
||
static LONGEST m68hc11_call_dummy_words[] =
|
||
{0};
|
||
struct gdbarch *gdbarch;
|
||
struct gdbarch_tdep *tdep;
|
||
int elf_flags;
|
||
|
||
soft_reg_initialized = 0;
|
||
|
||
/* Extract the elf_flags if available. */
|
||
if (info.abfd != NULL
|
||
&& bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
|
||
elf_flags = elf_elfheader (info.abfd)->e_flags;
|
||
else
|
||
elf_flags = 0;
|
||
|
||
/* try to find a pre-existing architecture */
|
||
for (arches = gdbarch_list_lookup_by_info (arches, &info);
|
||
arches != NULL;
|
||
arches = gdbarch_list_lookup_by_info (arches->next, &info))
|
||
{
|
||
if (gdbarch_tdep (arches->gdbarch)->elf_flags != elf_flags)
|
||
continue;
|
||
|
||
return arches->gdbarch;
|
||
}
|
||
|
||
/* Need a new architecture. Fill in a target specific vector. */
|
||
tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
|
||
gdbarch = gdbarch_alloc (&info, tdep);
|
||
tdep->elf_flags = elf_flags;
|
||
|
||
/* NOTE: cagney/2002-12-06: This can be deleted when this arch is
|
||
ready to unwind the PC first (see frame.c:get_prev_frame()). */
|
||
set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
|
||
|
||
switch (info.bfd_arch_info->arch)
|
||
{
|
||
case bfd_arch_m68hc11:
|
||
tdep->stack_correction = 1;
|
||
tdep->use_page_register = 0;
|
||
tdep->prologue = m6811_prologue;
|
||
set_gdbarch_addr_bit (gdbarch, 16);
|
||
set_gdbarch_num_pseudo_regs (gdbarch, M68HC11_NUM_PSEUDO_REGS);
|
||
set_gdbarch_pc_regnum (gdbarch, HARD_PC_REGNUM);
|
||
set_gdbarch_num_regs (gdbarch, M68HC11_NUM_REGS);
|
||
break;
|
||
|
||
case bfd_arch_m68hc12:
|
||
tdep->stack_correction = 0;
|
||
tdep->use_page_register = elf_flags & E_M68HC12_BANKS;
|
||
tdep->prologue = m6812_prologue;
|
||
set_gdbarch_addr_bit (gdbarch, elf_flags & E_M68HC12_BANKS ? 32 : 16);
|
||
set_gdbarch_num_pseudo_regs (gdbarch,
|
||
elf_flags & E_M68HC12_BANKS
|
||
? M68HC12_NUM_PSEUDO_REGS
|
||
: M68HC11_NUM_PSEUDO_REGS);
|
||
set_gdbarch_pc_regnum (gdbarch, elf_flags & E_M68HC12_BANKS
|
||
? M68HC12_HARD_PC_REGNUM : HARD_PC_REGNUM);
|
||
set_gdbarch_num_regs (gdbarch, elf_flags & E_M68HC12_BANKS
|
||
? M68HC12_NUM_REGS : M68HC11_NUM_REGS);
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
/* Initially set everything according to the ABI.
|
||
Use 16-bit integers since it will be the case for most
|
||
programs. The size of these types should normally be set
|
||
according to the dwarf2 debug information. */
|
||
set_gdbarch_short_bit (gdbarch, 16);
|
||
set_gdbarch_int_bit (gdbarch, elf_flags & E_M68HC11_I32 ? 32 : 16);
|
||
set_gdbarch_float_bit (gdbarch, 32);
|
||
set_gdbarch_double_bit (gdbarch, elf_flags & E_M68HC11_F64 ? 64 : 32);
|
||
set_gdbarch_long_double_bit (gdbarch, 64);
|
||
set_gdbarch_long_bit (gdbarch, 32);
|
||
set_gdbarch_ptr_bit (gdbarch, 16);
|
||
set_gdbarch_long_long_bit (gdbarch, 64);
|
||
|
||
/* Characters are unsigned. */
|
||
set_gdbarch_char_signed (gdbarch, 0);
|
||
|
||
/* Set register info. */
|
||
set_gdbarch_fp0_regnum (gdbarch, -1);
|
||
set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, m68hc11_frame_init_saved_regs);
|
||
set_gdbarch_frame_args_skip (gdbarch, 0);
|
||
|
||
set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
|
||
set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
|
||
|
||
set_gdbarch_sp_regnum (gdbarch, HARD_SP_REGNUM);
|
||
set_gdbarch_deprecated_fp_regnum (gdbarch, SOFT_FP_REGNUM);
|
||
set_gdbarch_register_name (gdbarch, m68hc11_register_name);
|
||
set_gdbarch_register_type (gdbarch, m68hc11_register_type);
|
||
set_gdbarch_pseudo_register_read (gdbarch, m68hc11_pseudo_register_read);
|
||
set_gdbarch_pseudo_register_write (gdbarch, m68hc11_pseudo_register_write);
|
||
|
||
set_gdbarch_deprecated_call_dummy_words (gdbarch, m68hc11_call_dummy_words);
|
||
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (m68hc11_call_dummy_words));
|
||
set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
|
||
set_gdbarch_extract_return_value (gdbarch, m68hc11_extract_return_value);
|
||
set_gdbarch_deprecated_push_arguments (gdbarch, m68hc11_push_arguments);
|
||
set_gdbarch_deprecated_push_return_address (gdbarch, m68hc11_push_return_address);
|
||
set_gdbarch_return_value_on_stack (gdbarch, m68hc11_return_value_on_stack);
|
||
|
||
set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return);
|
||
set_gdbarch_store_return_value (gdbarch, m68hc11_store_return_value);
|
||
set_gdbarch_extract_struct_value_address (gdbarch, m68hc11_extract_struct_value_address);
|
||
|
||
set_gdbarch_deprecated_frame_chain (gdbarch, m68hc11_frame_chain);
|
||
set_gdbarch_deprecated_frame_saved_pc (gdbarch, m68hc11_frame_saved_pc);
|
||
set_gdbarch_deprecated_frame_args_address (gdbarch, m68hc11_frame_args_address);
|
||
set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68hc11_saved_pc_after_call);
|
||
|
||
set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
|
||
|
||
set_gdbarch_deprecated_store_struct_return (gdbarch, m68hc11_store_struct_return);
|
||
set_gdbarch_deprecated_store_return_value (gdbarch, m68hc11_store_return_value);
|
||
set_gdbarch_deprecated_extract_struct_value_address
|
||
(gdbarch, m68hc11_extract_struct_value_address);
|
||
set_gdbarch_use_struct_convention (gdbarch, m68hc11_use_struct_convention);
|
||
set_gdbarch_deprecated_init_extra_frame_info (gdbarch, m68hc11_init_extra_frame_info);
|
||
set_gdbarch_deprecated_pop_frame (gdbarch, m68hc11_pop_frame);
|
||
set_gdbarch_skip_prologue (gdbarch, m68hc11_skip_prologue);
|
||
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
||
set_gdbarch_decr_pc_after_break (gdbarch, 0);
|
||
set_gdbarch_function_start_offset (gdbarch, 0);
|
||
set_gdbarch_breakpoint_from_pc (gdbarch, m68hc11_breakpoint_from_pc);
|
||
set_gdbarch_stack_align (gdbarch, m68hc11_stack_align);
|
||
set_gdbarch_deprecated_extra_stack_alignment_needed (gdbarch, 1);
|
||
set_gdbarch_print_insn (gdbarch, gdb_print_insn_m68hc11);
|
||
|
||
m68hc11_add_reggroups (gdbarch);
|
||
set_gdbarch_register_reggroup_p (gdbarch, m68hc11_register_reggroup_p);
|
||
|
||
/* Minsymbol frobbing. */
|
||
set_gdbarch_elf_make_msymbol_special (gdbarch,
|
||
m68hc11_elf_make_msymbol_special);
|
||
|
||
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
|
||
|
||
return gdbarch;
|
||
}
|
||
|
||
extern initialize_file_ftype _initialize_m68hc11_tdep; /* -Wmissing-prototypes */
|
||
|
||
void
|
||
_initialize_m68hc11_tdep (void)
|
||
{
|
||
register_gdbarch_init (bfd_arch_m68hc11, m68hc11_gdbarch_init);
|
||
register_gdbarch_init (bfd_arch_m68hc12, m68hc11_gdbarch_init);
|
||
m68hc11_init_reggroups ();
|
||
|
||
add_com ("regs", class_vars, show_regs, "Print all registers");
|
||
}
|
||
|