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Diffstat (limited to 'gdb/config/i386/tm-i386.h')
| -rw-r--r-- | gdb/config/i386/tm-i386.h | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/gdb/config/i386/tm-i386.h b/gdb/config/i386/tm-i386.h new file mode 100644 index 00000000000..e2039e5fbfa --- /dev/null +++ b/gdb/config/i386/tm-i386.h @@ -0,0 +1,307 @@ +/* Macro definitions for GDB on an Intel i[345]86. + Copyright (C) 1995, 1996 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#ifndef TM_I386_H +#define TM_I386_H 1 + +#ifdef __STDC__ /* Forward decl's for prototypes */ +struct frame_info; +struct frame_saved_regs; +struct type; +#endif + +#define TARGET_BYTE_ORDER LITTLE_ENDIAN + +/* Used for example in valprint.c:print_floating() to enable checking + for NaN's */ + +#define IEEE_FLOAT + +/* 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 2 + +/* 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));} + +extern int i386_skip_prologue PARAMS ((int)); + +/* 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)) + +/* Stack grows downward. */ + +#define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) + +/* 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 + +/* 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 + +/* Number of machine registers */ + +#define NUM_FREGS 0 /*8*/ /* Number of FP regs */ +#define NUM_REGS (16 + NUM_FREGS) /* Basic i*86 regs + FP regs */ + +/* Initializer for an array of names of registers. There should be at least + NUM_REGS strings in this initializer. Any excess ones are simply ignored. + The order of the first 8 registers must match the compiler's numbering + scheme (which is the same as the 386 scheme) and also regmap in the various + *-nat.c files. */ + +#define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \ + "esp", "ebp", "esi", "edi", \ + "eip", "eflags", "cs", "ss", \ + "ds", "es", "fs", "gs", \ + "st0", "st1", "st2", "st3", \ + "st4", "st5", "st6", "st7", \ + } + +/* 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 /* (ebp) Contains address of executing stack frame */ +#define SP_REGNUM 4 /* (usp) Contains address of top of stack */ +#define PC_REGNUM 8 /* (eip) Contains program counter */ +#define PS_REGNUM 9 /* (ps) Contains processor status */ + +#define FP0_REGNUM 16 /* (st0) 387 register */ +#define FPC_REGNUM 25 /* 80387 control register */ + +/* Total amount of space needed to store our copies of the machine's register + state, the array `registers'. */ + +#define REGISTER_BYTES ((NUM_REGS - NUM_FREGS)*4 + NUM_FREGS*10) + +/* Index within `registers' of the first byte of the space for register N. */ + +#define REGISTER_BYTE(N) \ + (((N) < FP0_REGNUM) ? ((N) * 4) : ((((N) - FP0_REGNUM) * 10) + 64)) + +/* Number of bytes of storage in the actual machine representation for + register N. All registers are 4 bytes, except 387 st(0) - st(7), + which are 80 bits each. */ + +#define REGISTER_RAW_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 10) + +/* Largest value REGISTER_RAW_SIZE can have. */ + +#define MAX_REGISTER_RAW_SIZE 10 + +/* Number of bytes of storage in the program's representation + for register N. */ + +#define REGISTER_VIRTUAL_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 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. Perhaps si and di should go here, but potentially they + could be used for things other than address. */ + +#define REGISTER_VIRTUAL_TYPE(N) \ + (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \ + ? lookup_pointer_type (builtin_type_void) \ + : (((N) < FP0_REGNUM) \ + ? builtin_type_int \ + : builtin_type_double)) + +/* 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) \ + { char buf[REGISTER_SIZE]; \ + (SP) -= sizeof (ADDR); \ + store_address (buf, sizeof (ADDR), ADDR); \ + write_memory ((SP), buf, 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) \ + i386_extract_return_value ((TYPE),(REGBUF),(VALBUF)) + +extern void i386_extract_return_value PARAMS ((struct type *, char [], char *)); + +/* Write into appropriate registers a function return value of type TYPE, given + in virtual format. */ + +#define STORE_RETURN_VALUE(TYPE,VALBUF) \ + { \ + if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ + write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \ + TYPE_LENGTH (TYPE)); \ + else \ + 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)) + +/* The following redefines make backtracing through sigtramp work. + They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp + from the sigcontext structure which is pushed by the kernel on the + user stack, along with a pointer to it. */ + +/* FRAME_CHAIN takes a frame's nominal address and produces the frame's + chain-pointer. + In the case of the i386, the frame's nominal address + is the address of a 4-byte word containing the calling frame's address. */ + +#define FRAME_CHAIN(thisframe) \ + ((thisframe)->signal_handler_caller \ + ? (thisframe)->frame \ + : (!inside_entry_file ((thisframe)->pc) \ + ? read_memory_integer ((thisframe)->frame, 4) \ + : 0)) + +/* 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) \ + do { \ + if ((FI)->signal_handler_caller) \ + (FRAMELESS) = 0; \ + else \ + (FRAMELESS) = frameless_look_for_prologue(FI); \ + } while (0) + +/* Saved Pc. Get it from sigcontext if within sigtramp. */ + +#define FRAME_SAVED_PC(FRAME) \ + (((FRAME)->signal_handler_caller \ + ? sigtramp_saved_pc (FRAME) \ + : read_memory_integer ((FRAME)->frame + 4, 4)) \ + ) + +extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *)); + +#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, which is typical now that the C compiler delays popping them. */ + +#define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi) + +extern int i386_frame_num_args PARAMS ((struct frame_info *)); + +/* 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)); } + +extern void i386_frame_find_saved_regs PARAMS ((struct frame_info *, + struct 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 (); } + +extern void i386_push_dummy_frame PARAMS ((void)); + +/* Discard from the stack the innermost frame, restoring all registers. */ + +#define POP_FRAME { i386_pop_frame (); } + +extern void i386_pop_frame PARAMS ((void)); + + +/* 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 */ + +#define CALL_DUMMY_BREAKPOINT_OFFSET 5 + +/* 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, args, type, gcc_p) \ +{ \ + int from, to, delta, loc; \ + loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ + from = loc + 5; \ + to = (int)(fun); \ + delta = to - from; \ + *((char *)(dummyname) + 1) = (delta & 0xff); \ + *((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \ + *((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \ + *((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \ +} + +extern void print_387_control_word PARAMS ((unsigned int)); +extern void print_387_status_word PARAMS ((unsigned int)); + +/* Offset from SP to first arg on stack at first instruction of a function */ + +#define SP_ARG0 (1 * 4) + +#endif /* ifndef TM_I386_H */ |