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Diffstat (limited to 'gdb/tm-i960.h')
| -rw-r--r-- | gdb/tm-i960.h | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/gdb/tm-i960.h b/gdb/tm-i960.h new file mode 100644 index 0000000..5ddf8c2 --- /dev/null +++ b/gdb/tm-i960.h @@ -0,0 +1,399 @@ +/* Parameters for target machine Intel 960, for GDB, the GNU debugger. + Copyright (C) 1990-1991 Free Software Foundation, Inc. + Contributed by Intel Corporation. +This file is part of GDB. + +GDB 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 1, or (at your option) +any later version. + +GDB 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 GDB; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Definitions to target GDB to any i960. */ + +#ifndef I80960 +#define I80960 +#endif + +/* Hook for the SYMBOL_CLASS of a parameter when decoding DBX symbol + information. In the i960, parameters can be stored as locals or as + args, depending on the type of the debug record. + + From empirical observation, gcc960 uses N_LSYM to indicate + arguments passed in registers and then copied immediately + to the frame, and N_PSYM to indicate arguments passed in a + g14-relative argument block. */ + +#define DBX_PARM_SYMBOL_CLASS(type) ((type == N_LSYM)? LOC_LOCAL_ARG: LOC_ARG) + +/* 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 + +/* Define this if the C compiler puts an underscore at the front + of external names before giving them to the linker. */ + +#define NAMES_HAVE_UNDERSCORE + + +/* Offset from address of function to start of its code. + Zero on most machines. */ + +#define FUNCTION_START_OFFSET 0 + +/* Advance ip across any function entry prologue instructions + to reach some "real" code. */ + +#define SKIP_PROLOGUE(ip) { ip = skip_prologue (ip); } +extern CORE_ADDR skip_prologue (); + +/* Immediately after a function call, return the saved ip. + 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) (saved_pc_after_call (frame)) +extern CORE_ADDR saved_pc_after_call (); + +/* Stack grows upward */ + +#define INNER_THAN > + +/* Nonzero if instruction at ip is a return instruction. */ + +#define ABOUT_TO_RETURN(ip) (read_memory_integer(ip,4) == 0x0a000000) + +/* Return 1 if P points to an invalid floating point value. + LEN is the length in bytes. */ + +#define INVALID_FLOAT(p, len) (0) + +/* How long (ordinary) registers are */ + +#define REGISTER_TYPE long + +/* Number of machine registers */ +#define NUM_REGS 40 + +/* Initializer for an array of names of registers. + There should be NUM_REGS strings in this initializer. */ + +#define REGISTER_NAMES { \ + /* 0 */ "pfp", "sp", "rip", "r3", "r4", "r5", "r6", "r7", \ + /* 8 */ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",\ + /* 16 */ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \ + /* 24 */ "g8", "g9", "g10", "g11", "g12", "g13", "g14", "fp", \ + /* 32 */ "pc", "ac", "ip", "tc", "fp0", "fp1", "fp2", "fp3", \ +} + +/* 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 SP_REGNUM 1 /* Contains address of top of stack */ +#define RIP_REGNUM 2 /* Return instruction pointer (local r2) */ +#define R15_REGNUM 15 /* Last local register */ +#define G0_REGNUM 16 /* First global register */ +#define G13_REGNUM 29 /* g13 - holds struct return address */ +#define G14_REGNUM 30 /* g14 - ptr to arg block / leafproc return address */ +#define FP_REGNUM 31 /* Contains address of executing stack frame */ +#define PCW_REGNUM 32 /* process control word */ +#define ACW_REGNUM 33 /* arithmetic control word */ +#define IP_REGNUM 34 /* instruction pointer */ +#define TCW_REGNUM 35 /* trace control word */ +#define FP0_REGNUM 36 /* First floating point register */ + +/* Some registers have more than one name */ + +#define PC_REGNUM IP_REGNUM /* GDB refers to ip as the Program Counter */ +#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 ((36*4) + (4*10)) + +/* Index within `registers' of the first byte of the space for register N. */ + +#define REGISTER_BYTE(N) ( (N) < FP0_REGNUM ? \ + (4*(N)) : ((10*(N)) - (6*FP0_REGNUM)) ) + +/* The i960 has register windows, sort of. */ + +#define HAVE_REGISTER_WINDOWS + +/* Is this register part of the register window system? A yes answer + implies that 1) The name of this register will not be the same in + other frames, and 2) This register is automatically "saved" upon + subroutine calls and thus there is no need to search more than one + stack frame for it. + + On the i960, in fact, the name of this register in another frame is + "mud" -- there is no overlap between the windows. Each window is + simply saved into the stack (true for our purposes, after having been + flushed; normally they reside on-chip and are restored from on-chip + without ever going to memory). */ + +#define REGISTER_IN_WINDOW_P(regnum) ((regnum) <= R15_REGNUM) + +/* Number of bytes of storage in the actual machine representation + for register N. On the i960, all regs are 4 bytes except for floating + point, which are 10. NINDY only sends us 8 byte values for these, + which is a pain, but VxWorks handles this correctly, so we must. */ + +#define REGISTER_RAW_SIZE(N) ( (N) < FP0_REGNUM ? 4 : 10 ) + +/* Number of bytes of storage in the program's representation for register N. */ + +#define REGISTER_VIRTUAL_SIZE(N) ( (N) < FP0_REGNUM ? 4 : 8 ) + +/* Largest value REGISTER_RAW_SIZE can have. */ + +#define MAX_REGISTER_RAW_SIZE 10 + +/* Largest value REGISTER_VIRTUAL_SIZE can have. */ + +#define MAX_REGISTER_VIRTUAL_SIZE 8 + +/* Nonzero if register N requires conversion from raw format to virtual + format. */ + +#define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM) + +/* Convert data from raw format for register REGNUM + to virtual format for register REGNUM. */ + +#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ +{ \ + extern struct ext_format ext_format_i960[]; \ + \ + if ((REGNUM) >= FP0_REGNUM) \ + ieee_extended_to_double (ext_format_i960, (FROM), (TO)); \ + else \ + bcopy ((FROM), (TO), 4); \ +} + +/* Convert data from virtual format for register REGNUM + to raw format for register REGNUM. */ + +#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ +{ \ + extern struct ext_format ext_format_i960[]; \ + \ + if ((REGNUM) >= FP0_REGNUM) \ + double_to_ieee_extended (ext_format_i960, (FROM), (TO)); \ + else \ + bcopy ((FROM), (TO), 4); \ +} + + +/* Return the GDB type object for the "standard" data type + of data in register N. */ + +#define REGISTER_VIRTUAL_TYPE(N) ((N) < FP0_REGNUM ? \ + builtin_type_int : builtin_type_double) + +/* 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 i960, a structure is returned in registers g0-g3, if it will fit. + If it's more than 16 bytes long, g13 pointed to it on entry. */ + +#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16) + +/* 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. + + On the i960 we just take as many bytes as we need from G0 through G3. */ + +#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ + bcopy(REGBUF+REGISTER_BYTE(G0_REGNUM), VALBUF, 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). + + Address of where to put structure was passed in in global + register g13 on entry. God knows what's in g13 now. The + (..., 0) below is to make it appear to return a value, though + actually all it does is call error(). */ + +#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ + (error("Don't know where large structure is returned on i960"), 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 i960. */ + +#define STORE_RETURN_VALUE(TYPE,VALBUF) \ + error ("Returning values from functions is not implemented in i960 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 i960 gdb") + +/* 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. + + FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address + and produces the nominal address of the caller frame. + + However, if FRAME_CHAIN_VALID returns zero, + it means the given frame is the outermost one and has no caller. + In that case, FRAME_CHAIN_COMBINE is not used. */ + +/* 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(fi) ((fi)->fsr = 0, (fi)->arg_pointer = -1) + +/* On the i960, we get the chain pointer by reading the PFP saved + on the stack and clearing the status bits. */ + +#define FRAME_CHAIN(thisframe) \ + (read_memory_integer (FRAME_FP(thisframe), 4) & ~0xf) + +#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) + +/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one + and has no caller. In that case, FRAME_CHAIN_COMBINE is not used. + + On the i960, each various target system type must define FRAME_CHAIN_VALID, + since it differs between NINDY and VxWorks, the two currently supported + targets types. We leave it undefined here. */ + + +/* 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) \ + { (FRAMELESS) = (leafproc_return ((FI)->pc) != 0); } + +/* Note that in the i960 architecture the return pointer is saved in the + *caller's* stack frame. + + Make sure to zero low-order bits because of bug in 960CA A-step part + (instruction addresses should always be word-aligned anyway). */ + +#define FRAME_SAVED_PC(frame) \ + ((read_memory_integer(FRAME_CHAIN(frame)+8,4)) & ~3) + +/* On the i960, 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: frame_args_address (fi, 0)) +extern CORE_ADDR frame_args_address (); /* i960-tdep.c */ + +/* 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_ARGS_ADDRESS_CORRECT(fi) (frame_args_address (fi, 1)) + +#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 i960-tdep.c */ + + +/* Print status when we get a random unexpected signal. We have more + kinds of signals than Unix does... */ + +#define PRINT_RANDOM_SIGNAL(stop_signal) print_fault (stop_signal) + +/* Things needed for making calls to functions in the inferior process */ + +/* Push an empty stack frame, to record the current ip, etc. + + Not (yet?) implemented for i960. */ + +#define PUSH_DUMMY_FRAME \ +error("Function calls into the inferior process are not supported on the i960") + +/* Discard from the stack the innermost frame, restoring all registers. */ + +#define POP_FRAME \ + pop_frame () + + +/* This sequence of words is the instructions + + callx 0x00000000 + fmark + */ + +/* #define CALL_DUMMY { 0x86003000, 0x00000000, 0x66003e00 } */ + +/* #define CALL_DUMMY_START_OFFSET 0 *//* Start execution at beginning of dummy */ + +/* Indicate that we don't support calling inferior child functions. */ + +#undef CALL_DUMMY + +/* Insert the specified number of args and function address + into a call sequence of the above form stored at 'dummyname'. + + Ignore arg count on i960. */ + +/* #define FIX_CALL_DUMMY(dummyname, fun, nargs) *(((int *)dummyname)+1) = fun */ + +#undef FIX_CALL_DUMMY + + +/* Interface definitions for kernel debugger KDB */ +/* (Not relevant to i960.) */ |