-/* Target-dependent code for Motorola 68HC11
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
- Contributed by Stephane Carrez, stcarrez@worldnet.fr
+/* 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.
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-#if 0
-/* FIXME: This is from tm-m68hc1.h */
-#define GDB_TARGET_IS_M6811
-
-/* Define the bit, byte, and word ordering of the machine. */
-
-#define TARGET_BYTE_ORDER BIG_ENDIAN
-
-/* Offset from address of function to start of its code.
- Zero on most machines. */
-
-#define FUNCTION_START_OFFSET 0
-
-#ifdef __STDC__ /* Forward decls for prototypes */
-struct frame_info;
-struct frame_saved_regs;
-struct type;
-struct value;
-#endif
-
-/* Advance PC across any function entry prologue instructions
- to reach some "real" code. */
-
-extern CORE_ADDR m68hc11_skip_prologue ();
-#define SKIP_PROLOGUE(ip) \
- m68hc11_skip_prologue (ip)
-
-
-/* Stack grows downward. */
-
-#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
-
-/* For a breakpoint, use "test". This is also the breakpoint
- instruction on the 68HC12. */
-#define BREAKPOINT {0x0}
-
-/* If your kernel resets the pc after the trap happens you may need to
- define this before including this file. */
-#define DECR_PC_AFTER_BREAK 0
-
-extern char *m68hc11_register_names[];
-#define REGISTER_NAME(i) m68hc11_register_names[i]
+#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"
-#define REGISTER_SIZE 2
+#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,
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 X_REGNUM 0
-#define D_REGNUM 1
-#define Y_REGNUM 2
-#define SP_REGNUM 3
-#define PC_REGNUM 4
-#define A_REGNUM 5
-#define B_REGNUM 6
-#define PSW_REGNUM 7
-#define Z_REGNUM 8
-#define FP_REGNUM 9
-#define TMP_REGNUM 10
-#define ZS_REGNUM 11
-#define XY_REGNUM 12
-#define ZD1_REGNUM 13
-#define ZD32_REGNUM (ZD1_REGNUM+31)
-
-#define NUM_REGS (ZD32_REGNUM+1)
-
-#include "opcode/m68hc11.h"
-
-/* Say how much memory is needed to store a copy of the register set */
-#define REGISTER_BYTES ((NUM_REGS)*2)
-
-/* Index within `registers' of the first byte of the space for
- register N. */
-
-#define REGISTER_BYTE(N) ((N) * 2)
-
-/* Number of bytes of storage in the actual machine representation
- for register N. */
-
-#define REGISTER_RAW_SIZE(N) (2)
-
-/* Number of bytes of storage in the program's representation
- for register N. */
-
-#define REGISTER_VIRTUAL_SIZE(N) (2)
-
-/* Largest value REGISTER_RAW_SIZE can have. */
-
-#define MAX_REGISTER_RAW_SIZE 8
-
-/* Largest value REGISTER_VIRTUAL_SIZE can have. */
-
-#define MAX_REGISTER_VIRTUAL_SIZE 8
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-
-#define REGISTER_VIRTUAL_TYPE(N) builtin_type_uint16
-
-/* Store the address of the place in which to copy the structure the
- subroutine will return. This is called from call_function.
-
- We store structs through a pointer passed in D */
-
-#define STORE_STRUCT_RETURN(ADDR, SP) \
- { write_register (D_REGNUM, (ADDR)); }
-
-
-/* Write into appropriate registers a function return value
- of type TYPE, given in virtual format.
-
- Things always get returned in D/X */
-
-#define STORE_RETURN_VALUE(TYPE,VALBUF) \
- write_register_bytes (REGISTER_BYTE (D_REGNUM), VALBUF, TYPE_LENGTH (TYPE))
-
-
-/* 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). */
-
-#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
-\f
-
-/* Define other aspects of the stack frame.
- we keep a copy of the worked out return pc lying around, since it
- is a useful bit of info */
-
-#define EXTRA_FRAME_INFO \
- int frame_reg; \
- CORE_ADDR return_pc; \
- CORE_ADDR dummy; \
- int frameless; \
- int size;
-
-/* There's a mess in stack frame creation. See comments in blockframe.c
- near reference to INIT_FRAME_PC_FIRST. */
+#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;
+};
-#define INIT_FRAME_PC(fromleaf, prev) /* nada */
+/* 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"
+};
-#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
- (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
- (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
+struct m68hc11_soft_reg
+{
+ const char *name;
+ CORE_ADDR addr;
+};
-#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
- m68hc11_init_extra_frame_info (fromleaf, fi)
+static struct m68hc11_soft_reg soft_regs[M68HC11_ALL_REGS];
-extern void m68hc11_init_extra_frame_info (int fromleaf,
- struct frame_info * fi);
+#define M68HC11_FP_ADDR soft_regs[SOFT_FP_REGNUM].addr
-/* A macro that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
+static int soft_min_addr;
+static int soft_max_addr;
+static int soft_reg_initialized = 0;
-#define FRAMELESS_FUNCTION_INVOCATION(FI) \
- frameless_look_for_prologue (FI)
+/* 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;
-#define FRAME_CHAIN(FRAME) m68hc11_frame_chain (FRAME)
-#define FRAME_CHAIN_VALID(chain,frame) \
- ((chain) != 0 && (frame) != 0)
-#define FRAME_SAVED_PC(FRAME) ((FRAME)->return_pc)
-#define FRAME_ARGS_ADDRESS(fi) (fi)->frame
-#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
+ 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;
+ }
+}
-#define SAVED_PC_AFTER_CALL(frame) m68hc11_saved_pc_after_call (frame)
+/* Initialize the table of soft register addresses according
+ to the symbol table. */
+ static void
+m68hc11_initialize_register_info (void)
+{
+ int i;
-/* Set VAL to the number of args passed to frame described by FI.
- Can set VAL to -1, meaning no way to tell. */
-/* We can't tell how many args there are */
+ 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");
-#define FRAME_NUM_ARGS(fi) (-1)
+ for (i = SOFT_D1_REGNUM; i < M68HC11_MAX_SOFT_REGS; i++)
+ {
+ char buf[10];
-/* Return number of bytes at start of arglist that are not really args. */
+ sprintf (buf, "_.d%d", i - SOFT_D1_REGNUM + 1);
+ m68hc11_get_register_info (&soft_regs[i], buf);
+ }
-#define FRAME_ARGS_SKIP 0
+ 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;
+}
-/* 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. */
+/* 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)
+ {
+ const int regsize = TYPE_LENGTH (builtin_type_uint32);
+ CORE_ADDR pc = read_register (HARD_PC_REGNUM);
+ int page = read_register (HARD_PAGE_REGNUM);
-#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
- m68hc11_frame_find_saved_regs (frame_info, &(frame_saved_regs))
+ if (pc >= 0x8000 && pc < 0xc000)
+ {
+ pc -= 0x8000;
+ pc += (page << 14);
+ pc += 0x1000000;
+ }
+ store_unsigned_integer (buf, regsize, pc);
+ return;
+ }
-extern void m68hc11_frame_find_saved_regs (struct frame_info *,
- struct frame_saved_regs *);
+ 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);
+ }
+}
-#define CALL_DUMMY { 0 }
-#define PUSH_DUMMY_FRAME
-#define CALL_DUMMY_START_OFFSET 0
-#define CALL_DUMMY_BREAKPOINT_OFFSET (0)
+/* 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;
-extern CORE_ADDR m68hc11_call_dummy_address (void);
-#define CALL_DUMMY_ADDRESS() m68hc11_call_dummy_address ()
+ memcpy (tmp, buf, regsize);
+ pc = extract_unsigned_integer (tmp, regsize);
+ if (pc >= 0x1000000)
+ {
+ pc -= 0x1000000;
+ write_register (HARD_PAGE_REGNUM, (pc >> 14) & 0x0ff);
+ pc &= 0x03fff;
+ write_register (HARD_PC_REGNUM, pc + 0x8000);
+ }
+ else
+ write_register (HARD_PC_REGNUM, pc);
+ return;
+ }
+
+ m68hc11_initialize_register_info ();
-#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
-sp = m68hc11_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
+ /* 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);
+ }
+}
-extern CORE_ADDR m68hc11_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR,
- int, struct value **,
- struct type *, int);
-#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
- sp = m68hc11_push_arguments ((nargs), (args), (sp), \
- (struct_return), (struct_addr))
-extern CORE_ADDR m68hc11_push_arguments (int, struct value **,
- CORE_ADDR, int, CORE_ADDR);
+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;
+}
-/* Extract from an array REGBUF containing the (raw) register state
- a function return value of type TYPE, and copy that, in virtual format,
- into VALBUF. */
+/* Immediately after a function call, return the saved pc before the frame
+ is setup. */
-#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
-m68hc11_extract_return_value(TYPE, REGBUF, VALBUF)
-extern void m68hc11_extract_return_value (struct type *, char *, char *);
+static CORE_ADDR
+m68hc11_saved_pc_after_call (struct frame_info *frame)
+{
+ CORE_ADDR addr;
+
+ addr = read_register (HARD_SP_REGNUM) + STACK_CORRECTION;
+ addr &= 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;
+}
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
-#define POP_FRAME m68hc11_pop_frame();
-extern void m68hc11_pop_frame (void);
+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;
-/* Number of bits in the appropriate type. */
+ return addr;
+}
-#define TARGET_INT_BIT (2 * TARGET_CHAR_BIT)
-#define TARGET_PTR_BIT (2 * TARGET_CHAR_BIT)
-#define TARGET_DOUBLE_BIT (4 * TARGET_CHAR_BIT)
-#define TARGET_LONG_DOUBLE_BIT (8 * TARGET_CHAR_BIT)
+static CORE_ADDR
+m68hc11_frame_locals_address (struct frame_info *frame)
+{
+ return get_frame_base (frame);
+}
-#endif
+/* Discard from the stack the innermost frame, restoring all saved
+ registers. */
-#include "defs.h"
-#include "frame.h"
-#include "obstack.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"
+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 ();
+}
-/* NOTE: This port is not finished. Several operations are not implemented
- and will raise an error. Most of these functions concern the calling
- of a function by GDB itself (command 'call') and retrieving data pushed
- on the stack. */
+\f
+/* 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. */
+};
-void m68hc11_frame_find_saved_regs (struct frame_info *fi,
- struct frame_saved_regs *fsr);
-static void m68hc11_pop_dummy_frame (struct frame_info *fi);
+struct insn_sequence {
+ enum m6811_seq_type type;
+ unsigned length;
+ unsigned short code[MAX_CODES];
+};
-/* Table of registers for 68HC11. This includes the hard registers
- and the pseudo hard registers used by GCC. */
-char*
-m68hc11_register_names[] =
-{
- "x", "d", "y", "sp", "pc", "a", "b",
- "ccr", "z", "frame","tmp", "zs", "xy",
- "ZD1", "ZD2", "ZD3", "ZD4", "ZD5", "ZD6", "ZD7",
- "ZD8", "ZD9", "ZD10", "ZD11", "ZD12", "ZD13", "ZD14",
- "ZD15", "ZD16", "ZD17", "ZD18", "ZD19", "ZD20", "ZD21",
- "ZD22", "ZD23", "ZD24", "ZD25", "ZD26", "ZD27", "ZD28",
- "ZD29", "ZD30", "ZD31", "ZD32"
+/* 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 } }
};
-static int reg_last = 32 * 2 + 6;
-static int frame_index = 6;
-/* Raise an error for operations which are not yet provided. */
-static void
-m68hc11_not_yet (const char *operation)
-{
- error ("Operation '%s' is not yet implemented\n", operation);
-}
+/* 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 }
+};
-/* Immediately after a function call, return the saved pc before the frame
- is setup. For sun3's, we check for the common case of being inside of a
- system call, and if so, we know that Sun pushes the call # on the stack
- prior to doing the trap. */
-CORE_ADDR
-m68hc11_saved_pc_after_call (struct frame_info *frame)
+/* 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 addr = frame->frame + 1 + 2;
+ 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;
+ }
+ }
- addr = read_register (SP_REGNUM) + 1;
- addr &= 0x0ffff;
- return read_memory_integer (addr, 2) & 0x0FFFF;
+ /* We have a full match. */
+ if (j == seq->length)
+ {
+ *val = cur_val;
+ *pc = *pc + j;
+ return seq;
+ }
+ }
+ return 0;
}
-/* Discard from the stack the innermost frame, restoring all saved
- registers. */
-
-void
-m68hc11_pop_frame (void)
+/* Return the instruction that the function at the PC is using. */
+static enum insn_return_kind
+m68hc11_get_return_insn (CORE_ADDR pc)
{
- m68hc11_not_yet ("m68hc11_pop_frame");
+ 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* first_line,
- int* frame_offset, int* pushed_regs)
+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;
- unsigned char op0, op1, op2;
- int add_sp_mode;
- int sp_adjust;
int size;
int found_frame_point;
- int found_load;
+ int saved_reg;
CORE_ADDR first_pc;
- int reg_saved;
+ 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;
- *pushed_regs = 0;
*first_line = pc;
return;
}
-#define OP_PAGE2 (0x18)
-#define OP_LDX (0xde)
-#define OP_LDY (0xde)
-#define OP_PSHX (0x3c)
-#define OP_PSHY (0x3c)
-#define OP_STS (0x9f)
-#define OP_TSX (0x30)
-#define OP_TSY (0x30)
-#define OP_XGDX (0x8f)
-#define OP_XGDY (0x8f)
-#define OP_ADDD (0xc3)
-#define OP_TXS (0x35)
-#define OP_TYS (0x35)
-
+ seq_table = gdbarch_tdep (current_gdbarch)->prologue;
+
/* The 68hc11 stack is as follows:
*/
pc = first_pc;
func_end = pc + 128;
- add_sp_mode = 0;
found_frame_point = 0;
- while (pc + 2 < func_end)
+ *frame_offset = 0;
+ save_addr = fp + STACK_CORRECTION;
+ while (!done && pc + 2 < func_end)
{
- op0 = read_memory_unsigned_integer (pc, 1);
- op1 = read_memory_unsigned_integer (pc + 1, 1);
- op2 = read_memory_unsigned_integer (pc + 2, 1);
+ struct insn_sequence *seq;
+ CORE_ADDR val;
- /* ldx *frame */
- if (op0 == OP_LDX && op1 == frame_index)
- {
- pc += 2;
- }
+ seq = m68hc11_analyze_instruction (seq_table, &pc, &val);
+ if (seq == 0)
+ break;
- /* ldy *frame */
- else if (op0 == OP_PAGE2 && op1 == OP_LDY && op2 == frame_index)
+ if (seq->type == P_SAVE_REG)
{
- pc += 3;
+ 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;
+ }
}
-
- /* pshx */
- else if (op0 == OP_PSHX)
- {
- pc += 1;
- size += 2;
- }
-
- /* pshy */
- else if (op0 == OP_PAGE2 && op1 == OP_PSHX)
- {
- pc += 2;
- size += 2;
- }
-
- /* sts *frame */
- else if (op0 == OP_STS && op1 == frame_index)
+ else if (seq->type == P_SET_FRAME)
{
found_frame_point = 1;
- pc += 2;
- break;
- }
- else if (op0 == OP_TSX && op1 == OP_XGDX)
- {
- add_sp_mode = 1;
- pc += 2;
+ *frame_offset = size;
}
- else if (op0 == OP_PAGE2 && op1 == OP_TSY && op2 == OP_PAGE2)
+ else if (seq->type == P_LOCAL_1)
{
- op0 = read_memory_unsigned_integer (pc + 3, 1);
- if (op0 != OP_XGDY)
- break;
-
- add_sp_mode = 2;
- pc += 4;
- }
- else if (add_sp_mode && op0 == OP_ADDD)
- {
- sp_adjust = read_memory_unsigned_integer (pc + 1, 2);
- if (sp_adjust & 0x8000)
- sp_adjust |= 0xffff0000L;
-
- sp_adjust = -sp_adjust;
- add_sp_mode |= 4;
- pc += 3;
- }
- else if (add_sp_mode == (1 | 4) && op0 == OP_XGDX
- && op1 == OP_TXS)
- {
- size += sp_adjust;
- pc += 2;
- add_sp_mode = 0;
+ size += 1;
}
- else if (add_sp_mode == (2 | 4) && op0 == OP_PAGE2
- && op1 == OP_XGDY && op2 == OP_PAGE2)
+ else if (seq->type == P_LOCAL_2)
{
- op0 = read_memory_unsigned_integer (pc + 3, 1);
- if (op0 != OP_TYS)
- break;
-
- size += sp_adjust;
- pc += 4;
- add_sp_mode = 0;
- }
- else
- {
- break;
- }
- }
-
- if (found_frame_point == 0)
- {
- *frame_offset = 0;
- }
- else
- {
- *frame_offset = size;
- }
-
- /* Now, look forward to see how many registers are pushed on the stack.
- We look only for soft registers so there must be a first LDX *REG
- before a PSHX. */
- reg_saved = 0;
- found_load = 0;
- while (pc + 2 < func_end)
- {
- op0 = read_memory_unsigned_integer (pc, 1);
- op1 = read_memory_unsigned_integer (pc + 1, 1);
- op2 = read_memory_unsigned_integer (pc + 2, 1);
- if (op0 == OP_LDX && op1 > frame_index && op1 <= reg_last)
- {
- found_load = 1;
- pc += 2;
- }
- else if (op0 == OP_PAGE2 && op1 == OP_LDY
- && op2 > frame_index && op2 < reg_last)
- {
- found_load = 1;
- pc += 3;
- }
- else if (op0 == OP_PSHX)
- {
- /* If there was no load, this is a push for a function call. */
- if (found_load == 0)
- break;
-
- reg_saved += 2;
- pc += 1;
- found_load = 0;
- }
- else if (op0 == OP_PAGE2 && op1 == OP_PSHY)
- {
- if (found_load == 0)
- break;
-
- reg_saved += 2;
- pc += 2;
- found_load = 0;
+ size += 2;
}
- else
+ else if (seq->type == P_LOCAL_N)
{
- break;
+ /* Stack pointer is decremented for the allocation. */
+ if (val & 0x8000)
+ size -= (int) (val) | 0xffff0000;
+ else
+ size -= val;
}
}
- *pushed_regs = reg_saved;
*first_line = pc;
}
-
-CORE_ADDR
+static CORE_ADDR
m68hc11_skip_prologue (CORE_ADDR pc)
{
CORE_ADDR func_addr, func_end;
struct symtab_and_line sal;
int frame_offset;
- int pushed_args;
- /* If we have line debugging information, then the end of the. */
- /* prologue should be the first assembly instruction of the
+ /* 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))
{
return sal.end;
}
- m68hc11_guess_from_prologue (pc, &pc, &frame_offset, &pushed_args);
+ 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
- INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
-*/
+/* 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. */
-CORE_ADDR
+static CORE_ADDR
m68hc11_frame_chain (struct frame_info *frame)
{
- unsigned addr;
+ 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 (frame->return_pc == 0 || inside_entry_file(frame->return_pc))
- return (CORE_ADDR)0;
+ if (get_frame_extra_info (frame)->return_pc == 0
+ || inside_entry_file (get_frame_extra_info (frame)->return_pc))
+ return (CORE_ADDR) 0;
- if (frame->frame == 0)
+ if (get_frame_base (frame) == 0)
{
return (CORE_ADDR) 0;
}
- addr = frame->frame + frame->size + 1 - 2;
+ addr = get_frame_base (frame) + get_frame_extra_info (frame)->size + STACK_CORRECTION - 2;
addr = read_memory_unsigned_integer (addr, 2) & 0x0FFFF;
- if (addr == 0)
- {
- return (CORE_ADDR)0;
- }
-
return addr;
}
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
-m68hc11_frame_find_saved_regs (struct frame_info *fi,
- struct frame_saved_regs *fsr)
+static void
+m68hc11_frame_init_saved_regs (struct frame_info *fi)
{
CORE_ADDR pc;
- int saved;
-
- pc = fi->pc;
- memset (fsr, 0, sizeof (*fsr));
- m68hc11_guess_from_prologue (pc, &pc, &fi->size, &saved);
+ 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];
}
-void
+static void
m68hc11_init_extra_frame_info (int fromleaf, struct frame_info *fi)
{
- unsigned addr;
- struct frame_saved_regs dummy;
+ CORE_ADDR addr;
- m68hc11_frame_find_saved_regs (fi, &dummy);
+ 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)
{
- fi->return_pc = m68hc11_saved_pc_after_call (fi);
+ 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 = fi->frame + fi->size + 1;
- fi->return_pc = read_memory_unsigned_integer (addr, 2) & 0x0ffff;
+ 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];
-#if 0
- printf ("Pc@0x%04x, FR 0x%04x, size %d, read ret @0x%04x -> 0x%04x\n",
- fi->pc,
- fi->frame, fi->size,
- addr & 0x0ffff,
- fi->return_pc);
-#endif
+ 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;
}
}
static void
show_regs (char *args, int from_tty)
{
- int ccr = read_register (PSW_REGNUM);
+ 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",
- read_register (PC_REGNUM),
- read_register (SP_REGNUM),
- read_register (FP_REGNUM),
+ (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_V_BIT ? 'V' : '-',
ccr & M6811_C_BIT ? 'C' : '-');
- printf_filtered ("D=%04x IX=%04x IY=%04x\n",
- read_register (D_REGNUM),
- read_register (X_REGNUM),
- read_register (Y_REGNUM));
- for (i = ZD1_REGNUM; i <= ZD32_REGNUM; i++)
+ 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 ("ZD%d=%04x",
- i - ZD1_REGNUM + 1,
- read_register (i));
- if (((i - ZD1_REGNUM) % 8) == 7)
+ 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");
}
-CORE_ADDR
-m68hc11_fix_call_dummy (char *dummyname,
- CORE_ADDR start_sp,
- CORE_ADDR fun,
- int nargs,
- value_ptr *args,
- struct type *type,
- int gcc_p)
-{
- m68hc11_not_yet ("m68hc11_fix_call_dummy");
- return 0;
-}
-
-static void
-m68hc11_pop_dummy_frame (struct frame_info *fi)
+static CORE_ADDR
+m68hc11_stack_align (CORE_ADDR addr)
{
- m68hc11_not_yet ("m68hc11_pop_dummy_frame");
+ return ((addr + 1) & -2);
}
-
-CORE_ADDR
+static CORE_ADDR
m68hc11_push_arguments (int nargs,
- value_ptr *args,
+ struct value **args,
CORE_ADDR sp,
int struct_return,
CORE_ADDR struct_addr)
{
- m68hc11_not_yet ("m68hc11_push_arguments");
- return 0;
+ 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 a location where we can set a breakpoint that will be hit
+ when an inferior function call returns. */
CORE_ADDR
m68hc11_call_dummy_address (void)
{
- m68hc11_not_yet ("m68hc11_call_dummy_address");
- return 0;
+ return entry_point_address ();
+}
+
+static struct type *
+m68hc11_register_virtual_type (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, char *valbuf)
+{
+ int len;
+
+ len = TYPE_LENGTH (type);
+
+ /* First argument is passed in D and X registers. */
+ if (len <= 4)
+ {
+ LONGEST v = extract_unsigned_integer (valbuf, len);
+
+ write_register (HARD_D_REGNUM, v);
+ if (len > 2)
+ {
+ v >>= 16;
+ write_register (HARD_X_REGNUM, v);
+ }
+ }
+ else
+ error ("return of value > 4 is not supported.");
}
-/* Given a return value in `regbuf' with a type `valtype',
+
+/* Given a return value in `regbuf' with a type `type',
extract and copy its value into `valbuf'. */
-void
-m68hc11_extract_return_value (struct type *valtype,
+static void
+m68hc11_extract_return_value (struct type *type,
char *regbuf,
char *valbuf)
{
- m68hc11_not_yet ("m68hc11_extract_return_value");
+ int len = TYPE_LENGTH (type);
+
+ switch (len)
+ {
+ case 1:
+ memcpy (valbuf, ®buf[HARD_D_REGNUM * 2 + 1], len);
+ break;
+
+ case 2:
+ memcpy (valbuf, ®buf[HARD_D_REGNUM * 2], len);
+ break;
+
+ case 3:
+ memcpy (&valbuf[0], ®buf[HARD_X_REGNUM * 2 + 1], 1);
+ memcpy (&valbuf[1], ®buf[HARD_D_REGNUM * 2], 2);
+ break;
+
+ case 4:
+ memcpy (&valbuf[0], ®buf[HARD_X_REGNUM * 2], 2);
+ memcpy (&valbuf[2], ®buf[HARD_D_REGNUM * 2], 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 (char *regbuf)
+{
+ return extract_address (®buf[HARD_D_REGNUM * 2],
+ REGISTER_RAW_SIZE (HARD_D_REGNUM));
+}
+
+/* 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);
+}
+
+\f
+
+/* 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);
+
+ /* Set register info. */
+ set_gdbarch_fp0_regnum (gdbarch, -1);
+ set_gdbarch_deprecated_max_register_raw_size (gdbarch, 2);
+ set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 2);
+ set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, m68hc11_frame_init_saved_regs);
+ set_gdbarch_frame_args_skip (gdbarch, 0);
+
+ set_gdbarch_read_pc (gdbarch, generic_target_read_pc);
+ set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
+ set_gdbarch_read_sp (gdbarch, generic_target_read_sp);
+ set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_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_size (gdbarch, 2);
+ set_gdbarch_register_bytes (gdbarch, M68HC11_ALL_REGS * 2);
+ set_gdbarch_register_virtual_type (gdbarch, m68hc11_register_virtual_type);
+ set_gdbarch_pseudo_register_read (gdbarch, m68hc11_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, m68hc11_pseudo_register_write);
+
+ set_gdbarch_call_dummy_address (gdbarch, m68hc11_call_dummy_address);
+ set_gdbarch_call_dummy_words (gdbarch, m68hc11_call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch,
+ sizeof (m68hc11_call_dummy_words));
+ set_gdbarch_deprecated_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
+ set_gdbarch_deprecated_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_deprecated_store_return_value (gdbarch, m68hc11_store_return_value);
+ set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68hc11_extract_struct_value_address);
+ set_gdbarch_register_convertible (gdbarch, generic_register_convertible_not);
+
+
+ set_gdbarch_deprecated_frame_chain (gdbarch, m68hc11_frame_chain);
+ set_gdbarch_deprecated_frame_saved_pc (gdbarch, m68hc11_frame_saved_pc);
+ set_gdbarch_frame_args_address (gdbarch, m68hc11_frame_args_address);
+ set_gdbarch_frame_locals_address (gdbarch, m68hc11_frame_locals_address);
+ set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68hc11_saved_pc_after_call);
+ set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
+
+ 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;
}
void
_initialize_m68hc11_tdep (void)
{
- tm_print_insn = print_insn_m68hc11;
+ 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");
}
projects / deliverable / binutils-gdb.git / blobdiff