256 lines
8.9 KiB
C
256 lines
8.9 KiB
C
/* Parameters for execution on a TI TMS320C80 (MVP) processor.
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Copyright 1997
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef TM_TIC80_H
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#define TM_TIC80_H
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#ifdef __STDC__ /* Forward declare structs used in prototypes */
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struct frame_info;
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struct type;
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struct value;
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struct symbol;
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struct frame_saved_regs;
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#endif
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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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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#define NUM_REGS 37
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#define REGISTER_NAMES \
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{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
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"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
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"pc", "npc", \
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"a0", "a1", "a2", "a3", \
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}
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/* Various dedicated register numbers
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FIXME: Shadow updates in sim/tic80/sim-calls.c */
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#define SP_REGNUM 1 /* Contains address of top of stack */
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#define ARG0_REGNUM 2 /* Contains argument 1 (r3 has high word) */
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#define RET_REGNUM 2 /* Contains function return value */
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#define ARGLAST_REGNUM 12 /* Contains argument 6 (r13 has high word) */
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#define FP_REGNUM 30 /* Contains address of executing stack frame */
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#define LR_REGNUM 31 /* Contains address of caller (link register) */
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#define PC_REGNUM 32 /* Contains program counter (FIXME?) */
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#define NPC_REGNUM 33 /* Contains the next program counter (FIXME?) */
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#define A0_REGNUM 34 /* Accumulator register 0 */
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#define A3_REGNUM 37 /* Accumulator register 1 */
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#define R0_REGNUM 0 /* General Purpose Register 0 - for sim */
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#define Rn_REGNUM 31 /* Last General Purpose Register - for sim */
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#define An_REGNUM A3_REGNUM /* Last Accumulator register - for sim */
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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 (((NUM_REGS - 4) * 4) + (4 * 8))
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) \
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(((N) >= A0_REGNUM) ? (((N) - A0_REGNUM) * 8 + A0_REGNUM * 4) : ((N) * 4))
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/* Most registers are 4 bytes */
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#define REGISTER_SIZE 4
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/* Some registers are 8 bytes. */
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#define REGISTER_RAW_SIZE(N) \
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(((N) >= A0_REGNUM) ? 8 : 4)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE (8)
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/* All regs are 4 bytes. */
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#define REGISTER_VIRTUAL_SIZE(N) (REGISTER_RAW_SIZE(N))
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE (MAX_REGISTER_RAW_SIZE)
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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) /* FIXME? */ \
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(((N) >= A0_REGNUM) ? builtin_type_float : builtin_type_int)
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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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/* Stack grows downward. */
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#define INNER_THAN <
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/* Sequence of bytes for breakpoint instruction.
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This is padded out to the size of a machine word. */
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#define BREAKPOINT {0x49, 0x80, 0x00, 0x00} /* FIXME! */
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/* Amount PC must be decremented by after a breakpoint.
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This is often the number of bytes in BREAKPOINT
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but not always. */
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#define DECR_PC_AFTER_BREAK 0 /* FIXME! */
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME tic80_pop_frame(get_current_frame ())
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extern struct frame_info *tic80_pop_frame PARAMS ((struct frame_info *frame));
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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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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can't tell how many args there are */
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#define FRAME_NUM_ARGS(val,fi) (val = -1)
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#define FRAME_ARGS_SKIP 0
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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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/* Define other aspects of the stack frame.
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We keep the offsets of all saved registers, 'cause we need 'em a lot!
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We also keep the current size of the stack frame, and the offset of
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the frame pointer from the stack pointer (for frameless functions, and
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when we're still in the prologue of a function with a frame) */
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#define EXTRA_FRAME_INFO \
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struct frame_saved_regs fsr; \
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int framesize; \
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int frameoffset; \
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int framereg;
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extern void tic80_init_extra_frame_info PARAMS ((struct frame_info *fi));
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) tic80_init_extra_frame_info (fi)
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#define INIT_FRAME_PC /* Not necessary */
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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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tic80_frame_find_saved_regs(frame_info, &(frame_saved_regs))
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extern void tic80_frame_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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#define SKIP_PROLOGUE(pc) { (pc) = tic80_skip_prologue (pc); }
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extern CORE_ADDR tic80_skip_prologue PARAMS ((CORE_ADDR pc));
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/* Immediately after a function call, return the saved pc.
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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 executes
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some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) read_register (LR_REGNUM)
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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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#define FRAME_CHAIN(thisframe) (CORE_ADDR) tic80_frame_chain (thisframe)
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extern CORE_ADDR tic80_frame_chain PARAMS ((struct frame_info *));
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#define FRAME_SAVED_PC(FRAME) tic80_frame_saved_pc (FRAME)
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extern CORE_ADDR tic80_frame_saved_pc PARAMS ((struct frame_info *));
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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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We store structs through a pointer passed in R2 */
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#define STORE_STRUCT_RETURN(STRUCT_ADDR, SP) \
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write_register (ARG0_REGNUM, STRUCT_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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memcpy ((VALBUF), \
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(char *)(REGBUF) + REGISTER_BYTE (RET_REGNUM) + \
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((TYPE_LENGTH (TYPE) > 4 ? 8 : 4) - TYPE_LENGTH (TYPE)), \
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TYPE_LENGTH (TYPE))
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes(REGISTER_BYTE (RET_REGNUM) + \
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((TYPE_LENGTH (TYPE) > 4 ? 8:4) - TYPE_LENGTH (TYPE)),\
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(VALBUF), TYPE_LENGTH (TYPE));
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/* PUSH_ARGUMENTS */
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extern CORE_ADDR tic80_push_arguments PARAMS ((int nargs,
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struct value **args,
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CORE_ADDR sp,
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unsigned char struct_return,
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CORE_ADDR struct_addr));
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#define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \
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(SP) = tic80_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR)
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/* PUSH_RETURN_ADDRESS */
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extern CORE_ADDR tic80_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR));
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#define PUSH_RETURN_ADDRESS(PC, SP) tic80_push_return_address (PC, SP)
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/* override the standard get_saved_register function with
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one that takes account of generic CALL_DUMMY frames */
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#define GET_SAVED_REGISTER
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#define USE_GENERIC_DUMMY_FRAMES
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#define CALL_DUMMY {0}
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#define CALL_DUMMY_LENGTH (0)
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#define CALL_DUMMY_START_OFFSET (0)
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#define CALL_DUMMY_BREAKPOINT_OFFSET (0)
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#define FIX_CALL_DUMMY(DUMMY1, STARTADDR, FUNADDR, NARGS, ARGS, TYPE, GCCP)
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#define CALL_DUMMY_LOCATION AT_ENTRY_POINT
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#define CALL_DUMMY_ADDRESS() entry_point_address ()
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/* generic dummy frame stuff */
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#define PUSH_DUMMY_FRAME generic_push_dummy_frame ()
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#define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP)
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#endif /* TM_TIC80_H */
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