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- /* Macro defintions for i386.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- GDB 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 1, or (at your option)
- any later version.
-
- GDB 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 GDB; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Define the bit, byte, and word ordering of the machine. */
- /* #define BITS_BIG_ENDIAN */
- /* #define BYTES_BIG_ENDIAN */
- /* #define WORDS_BIG_ENDIAN */
-
- /*
- * Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu)
- * July 1988
- */
-
-
- #ifndef i386
- #define i386
- #endif
-
- /* I'm running gdb 3.4 under 386/ix 2.0.2, which is a derivative of AT&T's
- Sys V/386 3.2.
-
- On some machines, gdb crashes when it's starting up while calling the
- vendor's termio tgetent() routine. It always works when run under
- itself (actually, under 3.2, it's not an infinitely recursive bug.)
- After some poking around, it appears that depending on the environment
- size, or whether you're running YP, or the phase of the moon or something,
- the stack is not always long-aligned when main() is called, and tgetent()
- takes strong offense at that. On some machines this bug never appears, but
- on those where it does, it occurs quite reliably. */
- #define ALIGN_STACK_ON_STARTUP
-
- /* define USG if you are using sys5 /usr/include's */
- #define USG
-
- /* USG systems need these */
- #define vfork() fork()
- #define MAXPATHLEN 500
-
- /* define this if you don't have the extension to coff that allows
- * file names to appear in the string table
- * (aux.x_file.x_foff)
- */
- #define COFF_NO_LONG_FILE_NAMES
-
- /* turn this on when rest of gdb is ready */
- /* #define IEEE_FLOAT */
-
- #define NBPG NBPC
- #define UPAGES USIZE
-
- #define HAVE_TERMIO
-
- /* Get rid of any system-imposed stack limit if possible. */
-
- /* #define SET_STACK_LIMIT_HUGE not in sys5 */
-
- /* Define this if the C compiler puts an underscore at the front
- of external names before giving them to the linker. */
-
- /* #define NAMES_HAVE_UNDERSCORE */
-
- /* Specify debugger information format. */
-
- /* #define READ_DBX_FORMAT */
- #define COFF_FORMAT
-
- /* number of traps that happen between exec'ing the shell
- * to run an inferior, and when we finally get to
- * the inferior code. This is 2 on most implementations.
- */
- #define START_INFERIOR_TRAPS_EXPECTED 4
-
- /* 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. */
-
- #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));}
-
- /* 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. */
-
- #define SAVED_PC_AFTER_CALL(frame) \
- (read_memory_integer (read_register (SP_REGNUM), 4))
-
- /* This is the amount to subtract from u.u_ar0
- to get the offset in the core file of the register values. */
-
- #define KERNEL_U_ADDR 0xe0000000
-
- /* Address of end of stack space. */
-
- #define STACK_END_ADDR 0x80000000
-
- /* Stack grows downward. */
-
- #define INNER_THAN <
-
- /* Sequence of bytes for breakpoint instruction. */
-
- #define BREAKPOINT {0xcc}
-
- /* Amount PC must be decremented by after a breakpoint.
- This is often the number of bytes in BREAKPOINT
- but not always. */
-
- #define DECR_PC_AFTER_BREAK 1
-
- /* Nonzero if instruction at PC is a return instruction. */
-
- #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3)
-
- /* Return 1 if P points to an invalid floating point value.
- LEN is the length in bytes -- not relevant on the 386. */
-
- #define INVALID_FLOAT(p, len) (0)
-
- /* code to execute to print interesting information about the
- * floating point processor (if any)
- * No need to define if there is nothing to do.
- */
- #define FLOAT_INFO { i386_float_info (); }
-
-
- /* Largest integer type */
- #define LONGEST long
-
- /* Name of the builtin type for the LONGEST type above. */
- #define BUILTIN_TYPE_LONGEST builtin_type_long
-
- /* Say how long (ordinary) registers are. */
-
- #define REGISTER_TYPE long
-
- /* Number of machine registers */
-
- #define NUM_REGS 16
-
- /* Initializer for an array of names of registers.
- There should be NUM_REGS strings in this initializer. */
-
- /* the order of the first 8 registers must match the compiler's
- * numbering scheme (which is the same as the 386 scheme)
- * also, this table must match regmap in i386-pinsn.c.
- */
- #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
- "esp", "ebp", "esi", "edi", \
- "eip", "ps", "cs", "ss", \
- "ds", "es", "fs", "gs", \
- }
-
- /* 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 FP_REGNUM 5 /* Contains address of executing stack frame */
- #define SP_REGNUM 4 /* Contains address of top of stack */
-
- #define PC_REGNUM 8
- #define PS_REGNUM 9
-
- #define REGISTER_U_ADDR(addr, blockend, regno) \
- (addr) = i386_register_u_addr ((blockend),(regno));
-
- /* Total amount of space needed to store our copies of the machine's
- register state, the array `registers'. */
- #define REGISTER_BYTES (NUM_REGS * 4)
-
- /* Index within `registers' of the first byte of the space for
- register N. */
-
- #define REGISTER_BYTE(N) ((N)*4)
-
- /* Number of bytes of storage in the actual machine representation
- for register N. */
-
- #define REGISTER_RAW_SIZE(N) (4)
-
- /* Number of bytes of storage in the program's representation
- for register N. */
-
- #define REGISTER_VIRTUAL_SIZE(N) (4)
-
- /* Largest value REGISTER_RAW_SIZE can have. */
-
- #define MAX_REGISTER_RAW_SIZE 4
-
- /* Largest value REGISTER_VIRTUAL_SIZE can have. */
-
- #define MAX_REGISTER_VIRTUAL_SIZE 4
-
- /* Nonzero if register N requires conversion
- from raw format to virtual format. */
-
- #define REGISTER_CONVERTIBLE(N) (0)
-
- /* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
- #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) {bcopy ((FROM), (TO), 4);}
-
- /* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
- #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) {bcopy ((FROM), (TO), 4);}
-
- /* Return the GDB type object for the "standard" data type
- of data in register N. */
-
- #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
-
- /* 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) \
- { (SP) -= sizeof (ADDR); \
- write_memory ((SP), &(ADDR), sizeof (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. */
-
- #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
- bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
-
- /* Write into appropriate registers a function return value
- of type TYPE, given in virtual format. */
-
- #define STORE_RETURN_VALUE(TYPE,VALBUF) \
- write_register_bytes (0, 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) (*(int *)(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.
-
- FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
- and produces the nominal address of the caller frame.
-
- However, if FRAME_CHAIN_VALID returns zero,
- it means the given frame is the outermost one and has no caller.
- In that case, FRAME_CHAIN_COMBINE is not used. */
-
- #define FRAME_CHAIN(thisframe) \
- (outside_startup_file ((thisframe)->pc) ? \
- read_memory_integer ((thisframe)->frame, 4) :\
- 0)
-
- #define FRAME_CHAIN_VALID(chain, thisframe) \
- (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
-
- #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
-
- /* 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, FRAMELESS) \
- FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS)
-
- #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
-
- #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
-
- #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
-
- /* Return number of args passed to a frame.
- Can return -1, meaning no way to tell. */
-
- #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
-
- /* 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. */
-
- #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
- { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
-
-
- /* Things needed for making the inferior call functions. */
-
- /* Push an empty stack frame, to record the current PC, etc. */
-
- #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
-
- /* Discard from the stack the innermost frame, restoring all registers. */
-
- #define POP_FRAME { i386_pop_frame (); }
-
- /* this is
- * call 11223344 (32 bit relative)
- * int3
- */
-
- #define CALL_DUMMY { 0x223344e8, 0xcc11 }
-
- #define CALL_DUMMY_LENGTH 8
-
- #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
-
- /* Insert the specified number of args and function address
- into a call sequence of the above form stored at DUMMYNAME. */
-
- #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type) \
- { \
- int from, to, delta, loc; \
- loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
- from = loc + 5; \
- to = (int)(fun); \
- delta = to - from; \
- *(int *)((char *)(dummyname) + 1) = delta; \
- }
-
-
- #if 0
- /* Interface definitions for kernel debugger KDB. */
-
- /* Map machine fault codes into signal numbers.
- First subtract 0, divide by 4, then index in a table.
- Faults for which the entry in this table is 0
- are not handled by KDB; the program's own trap handler
- gets to handle then. */
-
- #define FAULT_CODE_ORIGIN 0
- #define FAULT_CODE_UNITS 4
- #define FAULT_TABLE \
- { 0, 0, 0, 0, 0, 0, 0, 0, \
- 0, 0, 0, 0, 0, 0, 0, 0, \
- 0, 0, 0, 0, 0, 0, 0, 0}
-
- /* Start running with a stack stretching from BEG to END.
- BEG and END should be symbols meaningful to the assembler.
- This is used only for kdb. */
-
- #define INIT_STACK(beg, end) {}
-
- /* Push the frame pointer register on the stack. */
- #define PUSH_FRAME_PTR {}
-
- /* Copy the top-of-stack to the frame pointer register. */
- #define POP_FRAME_PTR {}
-
- /* After KDB is entered by a fault, push all registers
- that GDB thinks about (all NUM_REGS of them),
- so that they appear in order of ascending GDB register number.
- The fault code will be on the stack beyond the last register. */
-
- #define PUSH_REGISTERS {}
-
- /* Assuming the registers (including processor status) have been
- pushed on the stack in order of ascending GDB register number,
- restore them and return to the address in the saved PC register. */
-
- #define POP_REGISTERS {}
- #endif
-