307 lines
10 KiB
C
307 lines
10 KiB
C
/* Macro definitions for GDB on an Intel i[345]86.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef TM_I386_H
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#define TM_I386_H 1
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#ifdef __STDC__ /* Forward decl's for prototypes */
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struct frame_info;
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struct frame_saved_regs;
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struct type;
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#endif
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* Used for example in valprint.c:print_floating() to enable checking
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for NaN's */
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#define IEEE_FLOAT
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/* Number of traps that happen between exec'ing the shell to run an
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inferior, and when we finally get to the inferior code. This is 2
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on most implementations. */
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#define START_INFERIOR_TRAPS_EXPECTED 2
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/* Offset from address of function to start of its code.
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Zero on most machines. */
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#define FUNCTION_START_OFFSET 0
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/* Advance PC across any function entry prologue instructions to reach some
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"real" code. */
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#define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));}
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extern int i386_skip_prologue PARAMS ((int));
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/* Immediately after a function call, return the saved pc. Can't always go
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through the frames for this because on some machines the new frame is not
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set up until the new function executes some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) (read_memory_integer (read_register (SP_REGNUM), 4))
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/* Stack grows downward. */
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#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0xcc}
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/* Amount PC must be decremented by after a breakpoint. This is often the
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number of bytes in BREAKPOINT but not always. */
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#define DECR_PC_AFTER_BREAK 1
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/* Say how long (ordinary) registers are. This is a piece of bogosity
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used in push_word and a few other places; REGISTER_RAW_SIZE is the
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real way to know how big a register is. */
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#define REGISTER_SIZE 4
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/* Number of machine registers */
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#define NUM_FREGS 0 /*8*/ /* Number of FP regs */
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#define NUM_REGS (16 + NUM_FREGS) /* Basic i*86 regs + FP regs */
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/* Initializer for an array of names of registers. There should be at least
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NUM_REGS strings in this initializer. Any excess ones are simply ignored.
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The order of the first 8 registers must match the compiler's numbering
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scheme (which is the same as the 386 scheme) and also regmap in the various
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*-nat.c files. */
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#define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \
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"esp", "ebp", "esi", "edi", \
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"eip", "eflags", "cs", "ss", \
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"ds", "es", "fs", "gs", \
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"st0", "st1", "st2", "st3", \
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"st4", "st5", "st6", "st7", \
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}
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/* Register numbers of various important registers.
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Note that some of these values are "real" register numbers,
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and correspond to the general registers of the machine,
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and some are "phony" register numbers which are too large
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to be actual register numbers as far as the user is concerned
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but do serve to get the desired values when passed to read_register. */
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#define FP_REGNUM 5 /* (ebp) Contains address of executing stack frame */
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#define SP_REGNUM 4 /* (usp) Contains address of top of stack */
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#define PC_REGNUM 8 /* (eip) Contains program counter */
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#define PS_REGNUM 9 /* (ps) Contains processor status */
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#define FP0_REGNUM 16 /* (st0) 387 register */
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#define FPC_REGNUM 25 /* 80387 control register */
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/* Total amount of space needed to store our copies of the machine's register
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state, the array `registers'. */
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#define REGISTER_BYTES ((NUM_REGS - NUM_FREGS)*4 + NUM_FREGS*10)
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/* Index within `registers' of the first byte of the space for register N. */
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#define REGISTER_BYTE(N) \
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(((N) < FP0_REGNUM) ? ((N) * 4) : ((((N) - FP0_REGNUM) * 10) + 64))
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/* Number of bytes of storage in the actual machine representation for
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register N. All registers are 4 bytes, except 387 st(0) - st(7),
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which are 80 bits each. */
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#define REGISTER_RAW_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 10)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 10
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/* Number of bytes of storage in the program's representation
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for register N. */
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#define REGISTER_VIRTUAL_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 8)
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 8
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/* Return the GDB type object for the "standard" data type of data in
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register N. Perhaps si and di should go here, but potentially they
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could be used for things other than address. */
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#define REGISTER_VIRTUAL_TYPE(N) \
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(((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \
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? lookup_pointer_type (builtin_type_void) \
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: (((N) < FP0_REGNUM) \
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? builtin_type_int \
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: builtin_type_double))
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/* Store the address of the place in which to copy the structure the
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subroutine will return. This is called from call_function. */
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#define STORE_STRUCT_RETURN(ADDR, SP) \
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{ char buf[REGISTER_SIZE]; \
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(SP) -= sizeof (ADDR); \
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store_address (buf, sizeof (ADDR), ADDR); \
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write_memory ((SP), buf, sizeof (ADDR)); }
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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i386_extract_return_value ((TYPE),(REGBUF),(VALBUF))
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extern void i386_extract_return_value PARAMS ((struct type *, char [], char *));
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/* Write into appropriate registers a function return value of type TYPE, given
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in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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{ \
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if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \
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TYPE_LENGTH (TYPE)); \
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else \
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write_register_bytes (0, (VALBUF), TYPE_LENGTH (TYPE)); \
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}
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/* Extract from an array REGBUF containing the (raw) register state the address
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in which a function should return its structure value, as a CORE_ADDR (or an
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expression that can be used as one). */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
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/* The following redefines make backtracing through sigtramp work.
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They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
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from the sigcontext structure which is pushed by the kernel on the
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user stack, along with a pointer to it. */
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/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
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chain-pointer.
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In the case of the i386, the frame's nominal address
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is the address of a 4-byte word containing the calling frame's address. */
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#define FRAME_CHAIN(thisframe) \
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((thisframe)->signal_handler_caller \
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? (thisframe)->frame \
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: (!inside_entry_file ((thisframe)->pc) \
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? read_memory_integer ((thisframe)->frame, 4) \
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: 0))
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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do { \
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if ((FI)->signal_handler_caller) \
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(FRAMELESS) = 0; \
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else \
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(FRAMELESS) = frameless_look_for_prologue(FI); \
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} while (0)
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/* Saved Pc. Get it from sigcontext if within sigtramp. */
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#define FRAME_SAVED_PC(FRAME) \
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(((FRAME)->signal_handler_caller \
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? sigtramp_saved_pc (FRAME) \
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: read_memory_integer ((FRAME)->frame + 4, 4)) \
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)
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extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *));
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Return number of args passed to a frame. Can return -1, meaning no way
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to tell, which is typical now that the C compiler delays popping them. */
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#define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi)
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extern int i386_frame_num_args PARAMS ((struct frame_info *));
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 8
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
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{ i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); }
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extern void i386_frame_find_saved_regs PARAMS ((struct frame_info *,
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struct frame_saved_regs *));
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); }
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extern void i386_push_dummy_frame PARAMS ((void));
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME { i386_pop_frame (); }
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extern void i386_pop_frame PARAMS ((void));
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/* this is
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* call 11223344 (32 bit relative)
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* int3
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*/
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#define CALL_DUMMY { 0x223344e8, 0xcc11 }
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#define CALL_DUMMY_LENGTH 8
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#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
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#define CALL_DUMMY_BREAKPOINT_OFFSET 5
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ \
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int from, to, delta, loc; \
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loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
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from = loc + 5; \
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to = (int)(fun); \
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delta = to - from; \
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*((char *)(dummyname) + 1) = (delta & 0xff); \
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*((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \
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*((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \
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*((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \
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}
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extern void print_387_control_word PARAMS ((unsigned int));
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extern void print_387_status_word PARAMS ((unsigned int));
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/* Offset from SP to first arg on stack at first instruction of a function */
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#define SP_ARG0 (1 * 4)
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#endif /* ifndef TM_I386_H */
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