Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 347 insertions, 0 deletions

diff --git a/gdb/config/arc/tm-arc.h b/gdb/config/arc/tm-arc.h
new file mode 100644
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+++ b/gdb/config/arc/tm-arc.h
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+/* Parameters for target machine ARC, for GDB, the GNU debugger.
+   Copyright (C) 1995 Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Used by arc-tdep.c to set the default cpu type.  */
+#define DEFAULT_ARC_CPU_TYPE "base"
+
+/* Byte order is selectable.  */
+#define	TARGET_BYTE_ORDER_SELECTABLE
+
+/* 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.  SKIP_PROLOGUE_FRAMELESS_P advances
+   the PC past some of the prologue, but stops as soon as it
+   knows that the function has a frame.  Its result is equal
+   to its input PC if the function is frameless, unequal otherwise.  */
+
+#define SKIP_PROLOGUE(pc) \
+  { pc = skip_prologue (pc, 0); }
+#define SKIP_PROLOGUE_FRAMELESS_P(pc) \
+  { pc = skip_prologue (pc, 1); }
+extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, int));
+
+/* Sequence of bytes for breakpoint instruction.
+   ??? The current value is "sr -1,[-1]" and is for the simulator only.
+   The simulator watches for this and does the right thing.
+   The hardware version will have to associate with each breakpoint
+   the sequence "flag 1; nop; nop; nop".  IE: The breakpoint insn will not
+   be a fixed set of bits but instead will be a branch to a semi-random
+   address.  Presumably this will be cleaned up for "second silicon".  */
+#define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
+#define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
+
+/* Given the exposed pipeline, there isn't any one correct value.
+   However, this value must be 4.  GDB can't handle any other value (other than
+   zero).  See for example infrun.c:
+   "prev_pc != stop_pc - DECR_PC_AFTER_BREAK"  */
+/* FIXME */
+#define DECR_PC_AFTER_BREAK 8
+
+/* We don't have a reliable single step facility.
+   ??? We do have a cycle single step facility, but that won't work.  */
+#define SOFTWARE_SINGLE_STEP_P 1
+extern void arc_software_single_step PARAMS ((unsigned int, int));
+#define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p)
+
+/* FIXME: Need to set STEP_SKIPS_DELAY.  */
+
+/* Given a pc value as defined by the hardware, return the real address.
+   Remember that on the ARC blink contains that status register which
+   includes PC + flags (so we have to mask out the flags).  */
+#define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
+
+/* 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) \
+  (ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
+
+/* Stack grows upward */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* 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 92
+
+/* 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", "fp", "sp", "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", "lp_count", \
+    /* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "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 */
+
+/* Fake registers used to mark immediate data.  */
+#define SHIMM_FLAG_REGNUM 61
+#define LIMM_REGNUM 62
+#define SHIMM_REGNUM 63
+
+#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 (NUM_REGS * 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)
+
+
+/* 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 r0. */
+
+#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")
+
+
+/* Describe the pointer in each stack frame to the previous stack frame
+   (its 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)
+
+/* 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.  */
+/* 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.  */
+
+#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(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
+
+/* 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)
+
+/* Where is the PC for a specific frame.
+   A leaf function may never save blink, so we have to check for that here.  */
+
+#define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
+struct frame_info; /* in case frame.h not included yet */
+CORE_ADDR arc_frame_saved_pc PARAMS ((struct frame_info *));
+
+/* If the argument is on the stack, it will be here.
+   We cache this value in the frame info if we've already looked it up.  */
+/* ??? Is the arg_pointer check necessary?  */
+
+#define FRAME_ARGS_ADDRESS(fi) \
+  (((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
+
+/* 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)
+
+/* 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 */
+
+
+/* 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); \
+}
+