338 lines
13 KiB
C
338 lines
13 KiB
C
/* Parameters for target machine ARC, for GDB, the GNU debugger.
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Copyright 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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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,
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Boston, MA 02111-1307, USA. */
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#include "regcache.h"
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/* Used by arc-tdep.c to set the default cpu type. */
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#define DEFAULT_ARC_CPU_TYPE "base"
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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 PC across any function entry prologue instructions
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to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
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the PC past some of the prologue, but stops as soon as it
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knows that the function has a frame. Its result is equal
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to its input PC if the function is frameless, unequal otherwise. */
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#define SKIP_PROLOGUE(pc) (arc_skip_prologue (pc, 0))
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#define SKIP_PROLOGUE_FRAMELESS_P(pc) (arc_skip_prologue (pc, 1))
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extern CORE_ADDR arc_skip_prologue (CORE_ADDR, int);
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/* Sequence of bytes for breakpoint instruction.
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??? The current value is "sr -1,[-1]" and is for the simulator only.
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The simulator watches for this and does the right thing.
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The hardware version will have to associate with each breakpoint
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the sequence "flag 1; nop; nop; nop". IE: The breakpoint insn will not
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be a fixed set of bits but instead will be a branch to a semi-random
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address. Presumably this will be cleaned up for "second silicon". */
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#define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
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#define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
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/* Given the exposed pipeline, there isn't any one correct value.
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However, this value must be 4. GDB can't handle any other value (other than
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zero). See for example infrun.c:
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"prev_pc != stop_pc - DECR_PC_AFTER_BREAK" */
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/* FIXME */
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#define DECR_PC_AFTER_BREAK 8
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/* We don't have a reliable single step facility.
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??? We do have a cycle single step facility, but that won't work. */
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#define SOFTWARE_SINGLE_STEP_P() 1
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extern void arc_software_single_step (enum target_signal, int);
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#define SOFTWARE_SINGLE_STEP(sig,bp_p) arc_software_single_step (sig, bp_p)
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/* FIXME: Need to set STEP_SKIPS_DELAY. */
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/* Given a pc value as defined by the hardware, return the real address.
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Remember that on the ARC blink contains that status register which
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includes PC + flags (so we have to mask out the flags). */
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#define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
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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
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executes some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) \
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(ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
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/* Stack grows upward */
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#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
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/* Say how long (ordinary) registers are. This is a piece of bogosity
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used in push_word and a few other places; REGISTER_RAW_SIZE is the
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real way to know how big a register is. */
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#define REGISTER_SIZE 4
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/* Number of machine registers */
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#define NUM_REGS 92
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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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{ \
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/* 0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
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/* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
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/* 16 */ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
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/* 24 */ "r24", "r25", "r26", "fp", "sp", "ilink1", "ilink2", "blink", \
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/* 32 */ "r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39", \
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/* 40 */ "r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47", \
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/* 48 */ "r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55", \
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/* 56 */ "r56", "mlo", "mmid", "mhi", "lp_count", \
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/* 61 */ "status", "sema", "lp_start", "lp_end", "identity", "debug", \
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/* 67 */ "aux10", "aux11", "aux12", "aux13", "aux14", \
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/* 72 */ "aux15", "aux16", "aux17", "aux18", "aux19", \
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/* 77 */ "aux1a", "aux1b", "aux1c", "aux1d", "aux1e", \
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/* 82 */ "aux1f", "aux20", "aux21", "aux22", \
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/* 86 */ "aux30", "aux31", "aux32", "aux33", "aux40", \
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/* 91 */ "pc" \
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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 R59_REGNUM 59 /* Last local register */
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#define FP_REGNUM 27 /* Contains address of executing stack frame */
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#define SP_REGNUM 28 /* stack pointer */
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#define BLINK_REGNUM 31 /* link register */
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#define STA_REGNUM 61 /* processor status word */
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#define PC_REGNUM 91 /* instruction pointer */
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#define AUX_BEG_REGNUM 61 /* aux reg begins */
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#define AUX_END_REGNUM 90 /* aux reg ends, pc not real aux reg */
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/* Fake registers used to mark immediate data. */
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#define SHIMM_FLAG_REGNUM 61
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#define LIMM_REGNUM 62
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#define SHIMM_REGNUM 63
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#define AUX_REG_MAP \
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{ \
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{ 0, 1, 2, 3, 4, 5, \
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16, -1, -1, -1, -1, \
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-1, -1, -1, -1, -1, \
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-1, -1, -1, -1, 30, \
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-1, 32, 33, -1, \
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48, 49, 50, 51, 64, \
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0 \
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}, \
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{ 0, 1, 2, 3, 4, 5, \
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16, -1, -1, -1, -1, \
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-1, -1, -1, -1, -1, \
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-1, -1, -1, -1, 30, \
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31, 32, 33, -1, \
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-1, -1, -1, -1, -1, \
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0 \
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}, \
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{ 0, 1, 2, 3, 4, 5, \
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16, 17, 18, 19, 20, \
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21, 22, 23, 24, 25, \
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26, 27, 28, 29, 30, \
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31, 32, 33, 34, \
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-1, -1, -1, -1, -1, \
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0 \
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} \
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}
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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 (NUM_REGS * 4)
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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) (4*(N))
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/* Number of bytes of storage in the actual machine representation
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for register N. */
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#define REGISTER_RAW_SIZE(N) 4
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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) 4
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 4
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 4
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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) (builtin_type_int)
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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 arc, a structure is always retunred with pointer in r0. */
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#define USE_STRUCT_CONVENTION(gcc_p, type) 1
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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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*/
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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memcpy(VALBUF, REGBUF+REGISTER_BYTE(R0_REGNUM), 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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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
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(error("Don't know where large structure is returned on arc"), 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 arc. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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error ("Returning values from functions is not implemented in arc 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 arc 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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/* 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(fromleaf, fi) \
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((fi)->fsr = 0, (fi)->arg_pointer = -1)
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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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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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/* On the arc, we get the chain pointer by reading the PFP saved
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on the stack. */
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/* The PFP and RPC is in fp and fp+4. */
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#define FRAME_CHAIN(thisframe) \
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(read_memory_integer (FRAME_FP (thisframe), 4))
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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. */
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#define FRAME_CHAIN_VALID(chain, thisframe) nonnull_frame_chain_valid (chain, thisframe)
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/* An expression 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. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI) \
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(((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue (FI))
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/* Where is the PC for a specific frame.
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A leaf function may never save blink, so we have to check for that here. */
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#define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
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struct frame_info; /* in case frame.h not included yet */
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CORE_ADDR arc_frame_saved_pc (struct frame_info *);
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/* If the argument is on the stack, it will be here.
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We cache this value in the frame info if we've already looked it up. */
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/* ??? Is the arg_pointer check necessary? */
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#define FRAME_ARGS_ADDRESS(fi) \
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(((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
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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_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(fi) (-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 arc-tdep.c */
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/* Things needed for making calls to functions in the inferior process */
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void arc_push_dummy_frame (void);
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#define PUSH_DUMMY_FRAME \
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arc_push_dummy_frame ()
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/* Discard from the stack the innermost frame, restoring all registers. */
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void arc_pop_frame (void);
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#define POP_FRAME \
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arc_pop_frame ()
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/* This sequence of words is the instructions bl xxxx, flag 1 */
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#define CALL_DUMMY { 0x28000000, 0x1fbe8001 }
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#define CALL_DUMMY_LENGTH 8
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/* Start execution at beginning of dummy */
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#define CALL_DUMMY_START_OFFSET 0
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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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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ \
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int from, to, delta, loc; \
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loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \
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from = loc + 4; \
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to = (int)(fun); \
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delta = (to - from) >> 2; \
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*((char *)(dummyname) + 1) = (delta & 0x1); \
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*((char *)(dummyname) + 2) = ((delta >> 1) & 0xff); \
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*((char *)(dummyname) + 3) = ((delta >> 9) & 0xff); \
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*((char *)(dummyname) + 4) = ((delta >> 17) & 0x7); \
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}
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