399 lines
14 KiB
C
399 lines
14 KiB
C
/* Parameters for target machine Intel 960, for GDB, the GNU debugger.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Definitions to target GDB to any i960. */
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#ifndef I80960
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#define I80960
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#endif
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/* Hook for the SYMBOL_CLASS of a parameter when decoding DBX symbol
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information. In the i960, parameters can be stored as locals or as
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args, depending on the type of the debug record.
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From empirical observation, gcc960 uses N_LSYM to indicate
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arguments passed in registers and then copied immediately
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to the frame, and N_PSYM to indicate arguments passed in a
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g14-relative argument block. */
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#define DBX_PARM_SYMBOL_CLASS(type) ((type == N_LSYM)? LOC_LOCAL_ARG: LOC_ARG)
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/* Byte order is configurable, but this machine runs little-endian. */
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* We have IEEE floating point, if we have any float at all. */
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#define IEEE_FLOAT
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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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 ip across any function entry prologue instructions
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to reach some "real" code. */
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#define SKIP_PROLOGUE(ip) { ip = skip_prologue (ip); }
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extern CORE_ADDR skip_prologue ();
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/* Immediately after a function call, return the saved ip.
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Can't always go through the frames for this because on some machines
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the new frame is not set up until the new function
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executes some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) (saved_pc_after_call (frame))
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extern CORE_ADDR saved_pc_after_call ();
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/* Stack grows upward */
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#define INNER_THAN >
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/* Nonzero if instruction at ip is a return instruction. */
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#define ABOUT_TO_RETURN(ip) (read_memory_integer(ip,4) == 0x0a000000)
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/* Return 1 if P points to an invalid floating point value.
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LEN is the length in bytes. */
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#define INVALID_FLOAT(p, len) (0)
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/* How long (ordinary) registers are */
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#define REGISTER_TYPE long
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/* Number of machine registers */
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#define NUM_REGS 40
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/* Initializer for an array of names of registers.
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There should be NUM_REGS strings in this initializer. */
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#define REGISTER_NAMES { \
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/* 0 */ "pfp", "sp", "rip", "r3", "r4", "r5", "r6", "r7", \
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/* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",\
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/* 16 */ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
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/* 24 */ "g8", "g9", "g10", "g11", "g12", "g13", "g14", "fp", \
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/* 32 */ "pc", "ac", "ip", "tc", "fp0", "fp1", "fp2", "fp3", \
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}
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/* Register numbers of various important registers (used to index
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into arrays of register names and register values). */
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#define R0_REGNUM 0 /* First local register */
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#define SP_REGNUM 1 /* Contains address of top of stack */
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#define RIP_REGNUM 2 /* Return instruction pointer (local r2) */
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#define R15_REGNUM 15 /* Last local register */
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#define G0_REGNUM 16 /* First global register */
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#define G13_REGNUM 29 /* g13 - holds struct return address */
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#define G14_REGNUM 30 /* g14 - ptr to arg block / leafproc return address */
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#define FP_REGNUM 31 /* Contains address of executing stack frame */
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#define PCW_REGNUM 32 /* process control word */
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#define ACW_REGNUM 33 /* arithmetic control word */
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#define IP_REGNUM 34 /* instruction pointer */
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#define TCW_REGNUM 35 /* trace control word */
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#define FP0_REGNUM 36 /* First floating point register */
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/* Some registers have more than one name */
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#define PC_REGNUM IP_REGNUM /* GDB refers to ip as the Program Counter */
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#define PFP_REGNUM R0_REGNUM /* Previous frame pointer */
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/* Total amount of space needed to store our copies of the machine's
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register state, the array `registers'. */
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#define REGISTER_BYTES ((36*4) + (4*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) ( (N) < FP0_REGNUM ? \
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(4*(N)) : ((10*(N)) - (6*FP0_REGNUM)) )
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/* The i960 has register windows, sort of. */
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#define HAVE_REGISTER_WINDOWS
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/* Is this register part of the register window system? A yes answer
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implies that 1) The name of this register will not be the same in
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other frames, and 2) This register is automatically "saved" upon
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subroutine calls and thus there is no need to search more than one
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stack frame for it.
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On the i960, in fact, the name of this register in another frame is
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"mud" -- there is no overlap between the windows. Each window is
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simply saved into the stack (true for our purposes, after having been
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flushed; normally they reside on-chip and are restored from on-chip
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without ever going to memory). */
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#define REGISTER_IN_WINDOW_P(regnum) ((regnum) <= R15_REGNUM)
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/* Number of bytes of storage in the actual machine representation
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for register N. On the i960, all regs are 4 bytes except for floating
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point, which are 10. NINDY only sends us 8 byte values for these,
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which is a pain, but VxWorks handles this correctly, so we must. */
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#define REGISTER_RAW_SIZE(N) ( (N) < FP0_REGNUM ? 4 : 10 )
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/* Number of bytes of storage in the program's representation for register N. */
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#define REGISTER_VIRTUAL_SIZE(N) ( (N) < FP0_REGNUM ? 4 : 8 )
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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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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 8
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/* Nonzero if register N requires conversion from raw format to virtual
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format. */
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#define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM)
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/* Convert data from raw format for register REGNUM
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to virtual format for register REGNUM. */
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
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{ \
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extern struct ext_format ext_format_i960[]; \
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\
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if ((REGNUM) >= FP0_REGNUM) \
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ieee_extended_to_double (ext_format_i960, (FROM), (TO)); \
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else \
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bcopy ((FROM), (TO), 4); \
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}
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/* Convert data from virtual format for register REGNUM
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to raw format for register REGNUM. */
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#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
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{ \
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extern struct ext_format ext_format_i960[]; \
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\
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if ((REGNUM) >= FP0_REGNUM) \
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double_to_ieee_extended (ext_format_i960, (FROM), (TO)); \
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else \
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bcopy ((FROM), (TO), 4); \
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}
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#define REGISTER_VIRTUAL_TYPE(N) ((N) < FP0_REGNUM ? \
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builtin_type_int : builtin_type_double)
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/* Macros for understanding function return values... */
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/* Does the specified function use the "struct returning" convention
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or the "value returning" convention? The "value returning" convention
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almost invariably returns the entire value in registers. The
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"struct returning" convention often returns the entire value in
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memory, and passes a pointer (out of or into the function) saying
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where the value (is or should go).
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Since this sometimes depends on whether it was compiled with GCC,
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this is also an argument. This is used in call_function to build a
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stack, and in value_being_returned to print return values.
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On i960, a structure is returned in registers g0-g3, if it will fit.
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If it's more than 16 bytes long, g13 pointed to it on entry. */
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#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16)
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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. This is only called if USE_STRUCT_CONVENTION for this
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type is 0.
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On the i960 we just take as many bytes as we need from G0 through G3. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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bcopy(REGBUF+REGISTER_BYTE(G0_REGNUM), VALBUF, TYPE_LENGTH (TYPE))
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/* If USE_STRUCT_CONVENTION produces a 1,
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extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR (or an expression that can be used as one).
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Address of where to put structure was passed in in global
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register g13 on entry. God knows what's in g13 now. The
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(..., 0) below is to make it appear to return a value, though
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actually all it does is call error(). */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
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(error("Don't know where large structure is returned on i960"), 0)
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format, for "value returning" functions.
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For 'return' command: not (yet) implemented for i960. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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error ("Returning values from functions is not implemented in i960 gdb")
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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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error ("Returning values from functions is not implemented in i960 gdb")
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/* Describe the pointer in each stack frame to the previous stack frame
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer.
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FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
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and produces the nominal address of the caller frame.
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However, if FRAME_CHAIN_VALID returns zero,
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it means the given frame is the outermost one and has no caller.
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In that case, FRAME_CHAIN_COMBINE is not used. */
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/* We cache information about saved registers in the frame structure,
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to save us from having to re-scan function prologues every time
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a register in a non-current frame is accessed. */
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#define EXTRA_FRAME_INFO \
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struct frame_saved_regs *fsr; \
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CORE_ADDR arg_pointer;
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/* Zero the frame_saved_regs pointer when the frame is initialized,
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so that FRAME_FIND_SAVED_REGS () will know to allocate and
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initialize a frame_saved_regs struct the first time it is called.
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Set the arg_pointer to -1, which is not valid; 0 and other values
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indicate real, cached values. */
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#define INIT_EXTRA_FRAME_INFO(fi) ((fi)->fsr = 0, (fi)->arg_pointer = -1)
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/* On the i960, we get the chain pointer by reading the PFP saved
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on the stack and clearing the status bits. */
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#define FRAME_CHAIN(thisframe) \
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(read_memory_integer (FRAME_FP(thisframe), 4) & ~0xf)
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#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
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/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
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and has no caller. In that case, FRAME_CHAIN_COMBINE is not used.
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On the i960, each various target system type must define FRAME_CHAIN_VALID,
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since it differs between NINDY and VxWorks, the two currently supported
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targets types. We leave it undefined here. */
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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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{ (FRAMELESS) = (leafproc_return ((FI)->pc) != 0); }
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/* Note that in the i960 architecture the return pointer is saved in the
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*caller's* stack frame.
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Make sure to zero low-order bits because of bug in 960CA A-step part
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(instruction addresses should always be word-aligned anyway). */
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#define FRAME_SAVED_PC(frame) \
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((read_memory_integer(FRAME_CHAIN(frame)+8,4)) & ~3)
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/* On the i960, FRAME_ARGS_ADDRESS should return the value of
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g14 as passed into the frame, if known. We need a function for this.
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We cache this value in the frame info if we've already looked it up. */
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#define FRAME_ARGS_ADDRESS(fi) \
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(((fi)->arg_pointer != -1)? (fi)->arg_pointer: frame_args_address (fi, 0))
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extern CORE_ADDR frame_args_address (); /* i960-tdep.c */
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/* This is the same except it should return 0 when
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it does not really know where the args are, rather than guessing.
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This value is not cached since it is only used infrequently. */
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#define FRAME_ARGS_ADDRESS_CORRECT(fi) (frame_args_address (fi, 1))
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#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
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/* Set NUMARGS to the number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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#define FRAME_NUM_ARGS(numargs, fi) (numargs = -1)
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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 0
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/* Produce the positions of the saved registers in a stack frame. */
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#define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
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frame_find_saved_regs (frame_info_addr, &sr)
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extern void frame_find_saved_regs(); /* See i960-tdep.c */
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/* Print status when we get a random unexpected signal. We have more
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kinds of signals than Unix does... */
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#define PRINT_RANDOM_SIGNAL(stop_signal) print_fault (stop_signal)
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/* Things needed for making calls to functions in the inferior process */
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/* Push an empty stack frame, to record the current ip, etc.
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Not (yet?) implemented for i960. */
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#define PUSH_DUMMY_FRAME \
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error("Function calls into the inferior process are not supported on the i960")
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME \
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pop_frame ()
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/* This sequence of words is the instructions
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callx 0x00000000
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fmark
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*/
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/* #define CALL_DUMMY { 0x86003000, 0x00000000, 0x66003e00 } */
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/* #define CALL_DUMMY_START_OFFSET 0 *//* Start execution at beginning of dummy */
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/* Indicate that we don't support calling inferior child functions. */
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#undef CALL_DUMMY
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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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Ignore arg count on i960. */
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/* #define FIX_CALL_DUMMY(dummyname, fun, nargs) *(((int *)dummyname)+1) = fun */
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#undef FIX_CALL_DUMMY
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/* Interface definitions for kernel debugger KDB */
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/* (Not relevant to i960.) */
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