--- /dev/null
+/* Parameters for target machine ARC, for GDB, the GNU debugger.
+ Copyright (C) 1995 Free Software Foundation, Inc.
+ Contributed by Cygnus Support Corporation.
+
+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. */
+
+/* Byte order is configurable, but this machine runs little-endian. */
+#define TARGET_BYTE_ORDER LITTLE_ENDIAN
+
+/* We have IEEE floating point, if we have any float at all. */
+#define IEEE_FLOAT
+
+/* 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(pc) { pc = skip_prologue (pc); }
+extern CORE_ADDR skip_prologue ();
+
+/* Sequence of bytes for breakpoint instruction. */
+#define BREAKPOINT {0x01, 0x80, 0xbe, 0x1f}
+
+#define DECR_PC_AFTER_BREAK 4
+
+/* 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_register (BLINK_REGNUM))
+
+/* Stack grows upward */
+
+#define INNER_THAN <
+
+/* Nonzero if instruction at pc is a return instruction. */
+
+#define ABOUT_TO_RETURN(pc) (read_memory_integer(pc,4) == 0x380f8000)
+
+/* 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_REGS 91
+
+/* Initializer for an array of names of registers.
+ There should be NUM_REGS strings in this initializer. */
+
+#define REGISTER_NAMES \
+{ \
+ /* 0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
+ /* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
+ /* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
+ /* 24 */ "r24", "r25", "r26", "r27", "r28", "ilink1", "ilink2", "blink", \
+ /* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \
+ /* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \
+ /* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \
+ /* 56 */ "r56", "mlo", "mmid", "mhi", "lpcnt", \
+ /* 61 */ "sta", "sema", "lpst", "lpend", "iden", "debug", \
+ /* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \
+ /* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \
+ /* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \
+ /* 82 */ "aux1f", "aux20", "aux21", "aux22", \
+ /* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \
+ /* 91 */ "pc" \
+}
+
+/* Register numbers of various important registers (used to index
+ into arrays of register names and register values). */
+
+#define R0_REGNUM 0 /* First local register */
+#define R59_REGNUM 59 /* Last local register */
+#define FP_REGNUM 27 /* Contains address of executing stack frame */
+#define SP_REGNUM 28 /* stack pointer */
+#define BLINK_REGNUM 31 /* link register */
+#define STA_REGNUM 61 /* processor status word */
+#define PC_REGNUM 91 /* instruction pointer */
+#define AUX_BEG_REGNUM 61 /* aux reg begins */
+#define AUX_END_REGNUM 90 /* aux reg ends, pc not real aux reg */
+
+#define AUX_REG_MAP \
+{ \
+ { 0, 1, 2, 3, 4, 5, \
+ 16, -1, -1, -1, -1, \
+ -1, -1, -1, -1, -1, \
+ -1, -1, -1, -1, 30, \
+ -1, 32, 33, -1, \
+ 48, 49, 50, 51, 64, \
+ 0 \
+ }, \
+ { 0, 1, 2, 3, 4, 5, \
+ 16, -1, -1, -1, -1, \
+ -1, -1, -1, -1, -1, \
+ -1, -1, -1, -1, 30, \
+ 31, 32, 33, -1, \
+ -1, -1, -1, -1, -1, \
+ 0 \
+ }, \
+ { 0, 1, 2, 3, 4, 5, \
+ 16, 17, 18, 19, 20, \
+ 21, 22, 23, 24, 25, \
+ 26, 27, 28, 29, 30, \
+ 31, 32, 33, 34, \
+ -1, -1, -1, -1, -1, \
+ 0 \
+ } \
+}
+
+#define PFP_REGNUM R0_REGNUM /* Previous frame pointer */
+
+/* Total amount of space needed to store our copies of the machine's
+ register state, the array `registers'. */
+#define REGISTER_BYTES (91*4)
+
+/* Index within `registers' of the first byte of the space for register N. */
+#define REGISTER_BYTE(N) (4*(N))
+
+/* 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
+
+/* Return the GDB type object for the "standard" data type
+ of data in register N. */
+#define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
+
+\f
+/* Macros for understanding function return values... */
+
+/* Does the specified function use the "struct returning" convention
+ or the "value returning" convention? The "value returning" convention
+ almost invariably returns the entire value in registers. The
+ "struct returning" convention often returns the entire value in
+ memory, and passes a pointer (out of or into the function) saying
+ where the value (is or should go).
+
+ Since this sometimes depends on whether it was compiled with GCC,
+ this is also an argument. This is used in call_function to build a
+ stack, and in value_being_returned to print return values.
+
+ On arc, a structure is always retunred with pointer in r??. */
+
+#define USE_STRUCT_CONVENTION(gcc_p, type) 1
+
+/* 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. This is only called if USE_STRUCT_CONVENTION for this
+ type is 0.
+*/
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+ memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), TYPE_LENGTH (TYPE))
+
+/* If USE_STRUCT_CONVENTION produces a 1,
+ 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) \
+ (error("Don't know where large structure is returned on arc"), 0)
+
+/* Write into appropriate registers a function return value
+ of type TYPE, given in virtual format, for "value returning" functions.
+ For 'return' command: not (yet) implemented for arc. */
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+ error ("Returning values from functions is not implemented in arc gdb")
+
+/* 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) \
+ error ("Returning values from functions is not implemented in arc gdb")
+
+\f
+/* 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.
+ However, if FRAME_CHAIN_VALID returns zero,
+ it means the given frame is the outermost one and has no caller. */
+
+/* We cache information about saved registers in the frame structure,
+ to save us from having to re-scan function prologues every time
+ a register in a non-current frame is accessed. */
+
+#define EXTRA_FRAME_INFO \
+ struct frame_saved_regs *fsr; \
+ CORE_ADDR arg_pointer;
+
+/* Zero the frame_saved_regs pointer when the frame is initialized,
+ so that FRAME_FIND_SAVED_REGS () will know to allocate and
+ initialize a frame_saved_regs struct the first time it is called.
+ Set the arg_pointer to -1, which is not valid; 0 and other values
+ indicate real, cached values. */
+
+#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
+ ((fi)->fsr = 0, (fi)->arg_pointer = -1)
+
+/* On the arc, we get the chain pointer by reading the PFP saved
+ on the stack. */
+/* the PFP and RPC is in fp and fp+4. or it is in fp+4 and fp+8 ??? */
+
+#define FRAME_CHAIN(thisframe) \
+ (read_memory_integer (FRAME_FP(thisframe), 4))
+
+/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
+ and has no caller.
+#define FRAME_CHAIN_VALID(thisframe) \
+ 1
+
+/* 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)
+
+#define FRAME_SAVED_PC(frame) \
+ (read_memory_integer(FRAME_CHAIN(frame)+8,4))
+
+/* On the ARC, FRAME_ARGS_ADDRESS should return the value of
+ g14 as passed into the frame, if known. We need a function for this.
+ We cache this value in the frame info if we've already looked it up. */
+
+#define FRAME_ARGS_ADDRESS(fi) \
+ (((fi)->arg_pointer != -1)? (fi)->arg_pointer: (fi)->frame + 4)
+
+/* This is the same except it should return 0 when
+ it does not really know where the args are, rather than guessing.
+ This value is not cached since it is only used infrequently. */
+
+#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame + 4
+
+/* Set NUMARGS to the number of args passed to a frame.
+ Can return -1, meaning no way to tell. */
+
+#define FRAME_NUM_ARGS(numargs, fi) (numargs = -1)
+
+/* Return number of bytes at start of arglist that are not really args. */
+
+#define FRAME_ARGS_SKIP 0
+
+/* Produce the positions of the saved registers in a stack frame. */
+
+#define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
+ frame_find_saved_regs (frame_info_addr, &sr)
+extern void frame_find_saved_regs(); /* See arc-tdep.c */
+
+\f
+/* Things needed for making calls to functions in the inferior process */
+#define PUSH_DUMMY_FRAME \
+ push_dummy_frame ()
+
+/* Discard from the stack the innermost frame, restoring all registers. */
+#define POP_FRAME \
+ pop_frame ()
+
+/* This sequence of words is the instructions bl xxxx, flag 1 */
+#define CALL_DUMMY { 0x28000000, 0x1fbe8001 }
+#define CALL_DUMMY_LENGTH 8
+
+/* Start execution at beginning of dummy */
+#define CALL_DUMMY_START_OFFSET 0
+
+/* 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 + 4; \
+ to = (int)(fun); \
+ delta = (to - from) >> 2; \
+ *((char *)(dummyname) + 1) = (delta & 0x1); \
+ *((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \
+ *((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \
+ *((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \
+}
+
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