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Diffstat (limited to 'gdb/config/arc/tm-arc.h')
| -rw-r--r-- | gdb/config/arc/tm-arc.h | 347 |
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 index 00000000000..e964bef1645 --- /dev/null +++ b/gdb/config/arc/tm-arc.h @@ -0,0 +1,347 @@ +/* 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); \ +} + |