| /* Parameters for execution on a 68000 series machine. |
| Copyright 1986, 1987, 1989, 1990, 1992 Free Software Foundation, Inc. |
| |
| 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. */ |
| |
| /* Generic 68000 stuff, to be included by other tm-*.h files. */ |
| |
| #define IEEE_FLOAT (1) |
| |
| /* 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 |
| |
| /* Advance PC across any function entry prologue instructions |
| to reach some "real" code. */ |
| |
| #if !defined(SKIP_PROLOGUE) |
| #define SKIP_PROLOGUE(ip) (m68k_skip_prologue (ip)) |
| #endif |
| extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip)); |
| |
| /* Immediately after a function call, return the saved pc. |
| Can't always go through the frames for this because on some machines |
| the new frame is not set up until the new function executes |
| some instructions. */ |
| |
| struct frame_info; |
| struct frame_saved_regs; |
| |
| extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *)); |
| extern void m68k_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *)); |
| |
| #define SAVED_PC_AFTER_CALL(frame) \ |
| m68k_saved_pc_after_call(frame) |
| |
| /* Stack grows downward. */ |
| |
| #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) |
| |
| /* Stack must be kept short aligned when doing function calls. */ |
| |
| #define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1) |
| |
| /* Sequence of bytes for breakpoint instruction. |
| This is a TRAP instruction. The last 4 bits (0xf below) is the |
| vector. Systems which don't use 0xf should define BPT_VECTOR |
| themselves before including this file. */ |
| |
| #if !defined (BPT_VECTOR) |
| #define BPT_VECTOR 0xf |
| #endif |
| |
| #if !defined (BREAKPOINT) |
| #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} |
| #endif |
| |
| /* We default to vector 1 for the "remote" target, but allow targets |
| to override. */ |
| #if !defined (REMOTE_BPT_VECTOR) |
| #define REMOTE_BPT_VECTOR 1 |
| #endif |
| |
| #if !defined (REMOTE_BREAKPOINT) |
| #define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)} |
| #endif |
| |
| /* If your kernel resets the pc after the trap happens you may need to |
| define this before including this file. */ |
| |
| #if !defined (DECR_PC_AFTER_BREAK) |
| #define DECR_PC_AFTER_BREAK 2 |
| #endif |
| |
| /* Say how long (ordinary) registers are. This is a piece of bogosity |
| used in push_word and a few other places; REGISTER_RAW_SIZE is the |
| real way to know how big a register is. */ |
| |
| #define REGISTER_SIZE 4 |
| |
| #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
| #define REGISTER_BYTES_NOFP (16*4 + 8) |
| |
| #ifndef NUM_REGS |
| #define NUM_REGS 29 |
| #endif |
| |
| #define NUM_FREGS (NUM_REGS-24) |
| |
| #ifndef REGISTER_BYTES_OK |
| #define REGISTER_BYTES_OK(b) \ |
| ((b) == REGISTER_BYTES_FP \ |
| || (b) == REGISTER_BYTES_NOFP) |
| #endif |
| |
| #ifndef REGISTER_BYTES |
| #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) |
| #endif |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| |
| #define REGISTER_BYTE(N) \ |
| ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ |
| : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ |
| : (N) * 4) |
| |
| /* Number of bytes of storage in the actual machine representation |
| for register N. On the 68000, all regs are 4 bytes |
| except the floating point regs which are 12 bytes. */ |
| /* Note that the unsigned cast here forces the result of the |
| subtraction to very high positive values if N < FP0_REGNUM */ |
| |
| #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) |
| |
| /* Number of bytes of storage in the program's representation |
| for register N. On the 68000, all regs are 4 bytes |
| except the floating point regs which are 8-byte doubles. */ |
| |
| #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) |
| |
| /* Largest value REGISTER_RAW_SIZE can have. */ |
| |
| #define MAX_REGISTER_RAW_SIZE 12 |
| |
| /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| |
| #define MAX_REGISTER_VIRTUAL_SIZE 8 |
| |
| /* Nonzero if register N requires conversion |
| from raw format to virtual format. */ |
| |
| #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) |
| |
| #include "floatformat.h" |
| |
| /* Convert data from raw format for register REGNUM in buffer FROM |
| to virtual format with type TYPE in buffer TO. */ |
| |
| #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ |
| do \ |
| { \ |
| DOUBLEST dbl_tmp_val; \ |
| floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \ |
| store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val); \ |
| } while (0) |
| |
| /* Convert data from virtual format with type TYPE in buffer FROM |
| to raw format for register REGNUM in buffer TO. */ |
| |
| #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ |
| do \ |
| { \ |
| DOUBLEST dbl_tmp_val; \ |
| dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ |
| floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \ |
| } while (0) |
| |
| /* Return the GDB type object for the "standard" data type of data |
| in register N. This should be int for D0-D7, double for FP0-FP7, |
| and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc). |
| Note, for registers which contain addresses return pointer to void, |
| not pointer to char, because we don't want to attempt to print |
| the string after printing the address. */ |
| |
| #define REGISTER_VIRTUAL_TYPE(N) \ |
| ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \ |
| (unsigned) (N) >= FP0_REGNUM ? builtin_type_double : \ |
| (unsigned) (N) >= A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \ |
| builtin_type_int) |
| |
| /* Initializer for an array of names of registers. |
| Entries beyond the first NUM_REGS are ignored. */ |
| |
| #define REGISTER_NAMES \ |
| {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ |
| "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ |
| "ps", "pc", \ |
| "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ |
| "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" } |
| |
| /* 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 D0_REGNUM 0 |
| #define A0_REGNUM 8 |
| #define A1_REGNUM 9 |
| #define FP_REGNUM 14 /* Contains address of executing stack frame */ |
| #define SP_REGNUM 15 /* Contains address of top of stack */ |
| #define PS_REGNUM 16 /* Contains processor status */ |
| #define PC_REGNUM 17 /* Contains program counter */ |
| #define FP0_REGNUM 18 /* Floating point register 0 */ |
| #define FPC_REGNUM 26 /* 68881 control register */ |
| #define FPS_REGNUM 27 /* 68881 status register */ |
| #define FPI_REGNUM 28 /* 68881 iaddr register */ |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. This is called from call_function. */ |
| |
| #define STORE_STRUCT_RETURN(ADDR, SP) \ |
| { write_register (A1_REGNUM, (ADDR)); } |
| |
| /* 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. This is assuming that floating point values are returned |
| as doubles in d0/d1. */ |
| |
| #if !defined (EXTRACT_RETURN_VALUE) |
| #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| memcpy ((VALBUF), \ |
| (char *)(REGBUF) + \ |
| (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ |
| TYPE_LENGTH(TYPE)) |
| #endif |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. Assumes floats are passed |
| in d0/d1. */ |
| |
| #if !defined (STORE_RETURN_VALUE) |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) |
| #endif |
| |
| /* 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)) |
| |
| /* Describe the pointer in each stack frame to the previous stack frame |
| (its caller). */ |
| |
| /* FRAME_CHAIN takes a frame's nominal address and produces the frame's |
| chain-pointer. |
| In the case of the 68000, the frame's nominal address |
| is the address of a 4-byte word containing the calling frame's address. */ |
| |
| /* If we are chaining from sigtramp, then manufacture a sigtramp frame |
| (which isn't really on the stack. I'm not sure this is right for anything |
| but BSD4.3 on an hp300. */ |
| #define FRAME_CHAIN(thisframe) \ |
| (thisframe->signal_handler_caller \ |
| ? thisframe->frame \ |
| : (!inside_entry_file ((thisframe)->pc) \ |
| ? read_memory_integer ((thisframe)->frame, 4) \ |
| : 0)) |
| |
| /* Define other aspects of the stack frame. */ |
| |
| /* 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. */ |
| #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
| (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI)) |
| |
| /* This was determined by experimentation on hp300 BSD 4.3. Perhaps |
| it corresponds to some offset in /usr/include/sys/user.h or |
| something like that. Using some system include file would |
| have the advantage of probably being more robust in the face |
| of OS upgrades, but the disadvantage of being wrong for |
| cross-debugging. */ |
| |
| #define SIG_PC_FP_OFFSET 530 |
| |
| #define FRAME_SAVED_PC(FRAME) \ |
| (((FRAME)->signal_handler_caller \ |
| ? ((FRAME)->next \ |
| ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \ |
| : read_memory_integer (read_register (SP_REGNUM) \ |
| + SIG_PC_FP_OFFSET - 8, 4) \ |
| ) \ |
| : read_memory_integer ((FRAME)->frame + 4, 4)) \ |
| ) |
| |
| #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
| |
| #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
| |
| /* 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 |
| now that the C compiler delays popping them. */ |
| #if !defined (FRAME_NUM_ARGS) |
| #define FRAME_NUM_ARGS(fi) (-1) |
| #endif |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 8 |
| |
| /* 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. */ |
| |
| #if !defined (FRAME_FIND_SAVED_REGS) |
| #define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr)) |
| #endif /* no FIND_FRAME_SAVED_REGS. */ |
| |
| |
| /* Things needed for making the inferior call functions. */ |
| |
| /* The CALL_DUMMY macro is the sequence of instructions, as disassembled |
| by gdb itself: |
| |
| These instructions exist only so that m68k_find_saved_regs can parse |
| them as a "prologue"; they are never executed. |
| |
| fmovemx fp0-fp7,sp@- 0xf227 0xe0ff |
| moveml d0-a5,sp@- 0x48e7 0xfffc |
| clrw sp@- 0x4267 |
| movew ccr,sp@- 0x42e7 |
| |
| The arguments are pushed at this point by GDB; no code is needed in |
| the dummy for this. The CALL_DUMMY_START_OFFSET gives the position |
| of the following jsr instruction. That is where we start |
| executing. |
| |
| jsr @#0x32323232 0x4eb9 0x3232 0x3232 |
| addal #0x69696969,sp 0xdffc 0x6969 0x6969 |
| trap #<your BPT_VECTOR number here> 0x4e4? |
| nop 0x4e71 |
| |
| Note this is CALL_DUMMY_LENGTH bytes (28 for the above example). |
| |
| The dummy frame always saves the floating-point registers, whether they |
| actually exist on this target or not. */ |
| |
| /* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it |
| should be REMOTE_BPT_VECTOR. Best way to fix it would be to define |
| CALL_DUMMY_BREAKPOINT_OFFSET. */ |
| |
| #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))} |
| #define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */ |
| #define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction */ |
| #define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12) |
| |
| /* Insert the specified number of args and function address |
| into a call sequence of the above form stored at DUMMYNAME. |
| We use the BFD routines to store a big-endian value of known size. */ |
| |
| #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
| { bfd_putb32 (fun, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \ |
| bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); } |
| |
| /* Push an empty stack frame, to record the current PC, etc. */ |
| |
| #define PUSH_DUMMY_FRAME { m68k_push_dummy_frame (); } |
| |
| extern void m68k_push_dummy_frame PARAMS ((void)); |
| |
| extern void m68k_pop_frame PARAMS ((void)); |
| |
| /* Discard from the stack the innermost frame, restoring all registers. */ |
| |
| #define POP_FRAME { m68k_pop_frame (); } |
| |
| /* Offset from SP to first arg on stack at first instruction of a function */ |
| |
| #define SP_ARG0 (1 * 4) |
| |
| #define TARGET_M68K |