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Diffstat (limited to 'gdb/tm-arm.h')
| -rw-r--r-- | gdb/tm-arm.h | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/gdb/tm-arm.h b/gdb/tm-arm.h new file mode 100644 index 0000000..c061399 --- /dev/null +++ b/gdb/tm-arm.h @@ -0,0 +1,415 @@ +/* Definitions to make GDB target for an ARM under RISCiX (4.3bsd). + Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. + +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. */ + +#define TARGET_BYTE_ORDER LITTLE_ENDIAN + +/* IEEE format floating point */ + +#define IEEE_FLOAT + +/* I provide my own xfer_core_file to cope with shared libraries */ + +#define XFER_CORE_FILE + +/* 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 + +/* Debugger information will be in DBX format. */ + +#define READ_DBX_FORMAT + +/* 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) + +/* 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 (LR_REGNUM) & 0x03fffffc) + +/* I don't know the real values for these. */ +#define TARGET_UPAGES UPAGES +#define TARGET_NBPG NBPG + +/* Address of end of stack space. */ + +#define STACK_END_ADDR (0x01000000 - (TARGET_UPAGES * TARGET_NBPG)) + +/* Stack grows downward. */ + +#define INNER_THAN < + +/* Sequence of bytes for breakpoint instruction. */ + +#define BREAKPOINT {0x00,0x00,0x18,0xef} /* BKPT_SWI from <sys/ptrace.h> */ + +/* Amount PC must be decremented by after a breakpoint. + This is often the number of bytes in BREAKPOINT + but not always. */ + +#define DECR_PC_AFTER_BREAK 0 + +/* Nonzero if instruction at PC is a return instruction. */ + +#define ABOUT_TO_RETURN(pc) \ + ((read_memory_integer(pc, 4) & 0x0fffffff == 0x01b0f00e) || \ + (read_memory_integer(pc, 4) & 0x0ffff800 == 0x09eba800)) + +/* Return 1 if P points to an invalid floating point value. + LEN is the length in bytes. */ + +#define INVALID_FLOAT(p, len) 0 + +/* code to execute to print interesting information about the + * floating point processor (if any) + * No need to define if there is nothing to do. + */ +#define FLOAT_INFO { arm_float_info (); } + +/* Say how long (ordinary) registers are. */ + +#define REGISTER_TYPE long + +/* Number of machine registers */ + +/* Note: I make a fake copy of the pc in register 25 (calling it ps) so + that I can clear the status bits from pc (register 15) */ + +#define NUM_REGS 26 + +/* Initializer for an array of names of registers. + There should be NUM_REGS strings in this initializer. */ + +#define REGISTER_NAMES \ + { "a1", "a2", "a3", "a4", \ + "v1", "v2", "v3", "v4", "v5", "v6", \ + "sl", "fp", "ip", "sp", "lr", "pc", \ + "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "fps", "ps" } + +/* Register numbers of various important registers. + Note that some of these values are "real" register numbers, + and correspond to the general registers of the machine, + and some are "phony" register numbers which are too large + to be actual register numbers as far as the user is concerned + but do serve to get the desired values when passed to read_register. */ + +#define AP_REGNUM 11 +#define FP_REGNUM 11 /* Contains address of executing stack frame */ +#define SP_REGNUM 13 /* Contains address of top of stack */ +#define LR_REGNUM 14 /* address to return to from a function call */ +#define PC_REGNUM 15 /* Contains program counter */ +#define F0_REGNUM 16 /* first floating point register */ +#define FPS_REGNUM 24 /* floating point status register */ +#define PS_REGNUM 25 /* Contains processor status */ + + +/* Total amount of space needed to store our copies of the machine's + register state, the array `registers'. */ +#define REGISTER_BYTES (16*4 + 12*8 + 4 + 4) + +/* Index within `registers' of the first byte of the space for + register N. */ + +#define REGISTER_BYTE(N) (((N) < F0_REGNUM) ? (N)*4 : \ + (((N) < PS_REGNUM) ? 16*4 + ((N) - 16)*12 : \ + 16*4 + 8*12 + ((N) - FPS_REGNUM) * 4)) + +/* Number of bytes of storage in the actual machine representation + for register N. On the vax, all regs are 4 bytes. */ + +#define REGISTER_RAW_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 12) + +/* Number of bytes of storage in the program's representation + for register N. On the vax, all regs are 4 bytes. */ + +#define REGISTER_VIRTUAL_SIZE(N) (((N) < F0_REGNUM || (N) >= FPS_REGNUM) ? 4 : 8) + +/* Largest value REGISTER_RAW_SIZE can have. */ + +#define MAX_REGISTER_RAW_SIZE 12 + +/* 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) ((unsigned)(N) - F0_REGNUM < 8) + +/* Convert data from raw format for register REGNUM + to virtual format for register REGNUM. */ + +#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ + if (REGISTER_CONVERTIBLE(REGNUM)) \ + convert_from_extended((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) \ + if (REGISTER_CONVERTIBLE(REGNUM)) \ + convert_to_extended((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) \ + (((unsigned)(N) - F0_REGNUM) < 8 ? builtin_type_double : builtin_type_int) + +/* The system C compiler uses a similar structure return convention to gcc */ + +#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 4) + +/* 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) \ + { write_register (0, (ADDR)); } + +/* 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. */ + +#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ + if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ + convert_from_extended(REGBUF + REGISTER_BYTE (F0_REGNUM), VALBUF); \ + else \ + bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)) + +/* Write into appropriate registers a function return value + of type TYPE, given in virtual format. */ + +#define STORE_RETURN_VALUE(TYPE,VALBUF) \ + if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) { \ + char _buf[MAX_REGISTER_RAW_SIZE]; \ + convert_to_extended(VALBUF, _buf); \ + write_register_bytes (REGISTER_BYTE (F0_REGNUM), _buf, MAX_REGISTER_RAW_SIZE); \ + } else \ + write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) + +/* 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) (*(int *)(REGBUF)) + +/* Specify that for the native compiler variables for a particular + lexical context are listed after the beginning LBRAC instead of + before in the executables list of symbols. */ +#define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (!(gcc_p)) + + +/* 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. */ + +/* In the case of the ARM, the frame's nominal address is the FP value, + and 12 bytes before comes the saved previous FP value as a 4-byte word. */ + +#define FRAME_CHAIN(thisframe) \ + ((thisframe)->pc >= first_object_file_end ? \ + read_memory_integer ((thisframe)->frame - 12, 4) :\ + 0) + +#define FRAME_CHAIN_VALID(chain, thisframe) \ + (chain != 0 && (FRAME_SAVED_PC (thisframe) >= first_object_file_end)) + +#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) + +/* Define other aspects of the stack frame. */ + +/* 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) \ +{ \ + CORE_ADDR func_start, after_prologue; \ + func_start = (get_pc_function_start ((FI)->pc) + \ + FUNCTION_START_OFFSET); \ + after_prologue = func_start; \ + SKIP_PROLOGUE (after_prologue); \ + (FRAMELESS) = (after_prologue == func_start); \ +} + +/* Saved Pc. */ + +#define FRAME_SAVED_PC(FRAME) \ + (read_memory_integer ((FRAME)->frame - 4, 4) & 0x03fffffc) + +#define FRAME_ARGS_ADDRESS(fi) (fi->frame) + +#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) + +/* Return 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 + +/* Put here the code to store, into a struct frame_saved_regs, + the addresses of the saved registers of frame described by FRAME_INFO. + This includes special registers such as pc and fp saved in special + ways in the stack frame. sp is even more special: + the address we return for it IS the sp for the next frame. */ + +#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ +{ \ + register int regnum; \ + register int frame; \ + register int next_addr; \ + register int return_data_save; \ + register int saved_register_mask; \ + bzero (&frame_saved_regs, sizeof frame_saved_regs); \ + frame = (frame_info)->frame; \ + return_data_save = read_memory_integer(frame, 4) & 0x03fffffc - 12; \ + saved_register_mask = \ + read_memory_integer(return_data_save, 4); \ + next_addr = frame - 12; \ + for (regnum = 4; regnum < 10; regnum++) \ + if (saved_register_mask & (1<<regnum)) { \ + next_addr -= 4; \ + (frame_saved_regs).regs[regnum] = next_addr; \ + } \ + if (read_memory_integer(return_data_save + 4, 4) == 0xed6d7103) { \ + next_addr -= 12; \ + (frame_saved_regs).regs[F0_REGNUM + 7] = next_addr; \ + } \ + if (read_memory_integer(return_data_save + 8, 4) == 0xed6d6103) { \ + next_addr -= 12; \ + (frame_saved_regs).regs[F0_REGNUM + 6] = next_addr; \ + } \ + if (read_memory_integer(return_data_save + 12, 4) == 0xed6d5103) { \ + next_addr -= 12; \ + (frame_saved_regs).regs[F0_REGNUM + 5] = next_addr; \ + } \ + if (read_memory_integer(return_data_save + 16, 4) == 0xed6d4103) { \ + next_addr -= 12; \ + (frame_saved_regs).regs[F0_REGNUM + 4] = next_addr; \ + } \ + (frame_saved_regs).regs[SP_REGNUM] = next_addr; \ + (frame_saved_regs).regs[PC_REGNUM] = frame - 4; \ + (frame_saved_regs).regs[PS_REGNUM] = frame - 4; \ + (frame_saved_regs).regs[FP_REGNUM] = frame - 12; \ +} + +/* Things needed for making the inferior call functions. */ + +/* Push an empty stack frame, to record the current PC, etc. */ + +#define PUSH_DUMMY_FRAME \ +{ \ + register CORE_ADDR sp = read_register (SP_REGNUM); \ + register int regnum; \ + /* opcode for ldmdb fp,{v1-v6,fp,ip,lr,pc}^ */ \ + sp = push_word(sp, 0xe92dbf0); /* dummy return_data_save ins */ \ + /* push a pointer to the dummy instruction minus 12 */ \ + sp = push_word(sp, read_register (SP_REGNUM) - 16); \ + sp = push_word(sp, read_register (PS_REGNUM)); \ + sp = push_word(sp, read_register (SP_REGNUM)); \ + sp = push_word(sp, read_register (FP_REGNUM)); \ + for (regnum = 9; regnum >= 4; regnum --) \ + sp = push_word(sp, read_register (regnum)); \ + write_register (FP_REGNUM, read_register (SP_REGNUM) - 8); \ + write_register (SP_REGNUM, sp); } + +/* Discard from the stack the innermost frame, restoring all registers. */ + +#define POP_FRAME \ +{ \ + register CORE_ADDR fp = read_register (FP_REGNUM); \ + register unsigned long return_data_save = \ + read_memory_integer ( (read_memory_integer (fp, 4) & \ + 0x03fffffc) - 12, 4); \ + register int regnum; \ + write_register (PS_REGNUM, read_memory_integer (fp - 4, 4)); \ + write_register (PC_REGNUM, read_register (PS_REGNUM) & 0x03fffffc); \ + write_register (SP_REGNUM, read_memory_integer (fp - 8, 4)); \ + write_register (FP_REGNUM, read_memory_integer (fp - 12, 4)); \ + fp -= 12; \ + for (regnum = 9; regnum >= 4; regnum--) \ + if (return_data_save & (1<<regnum)) { \ + fp -= 4; \ + write_register (regnum, read_memory_integer(fp, 4)); \ + } \ + flush_cached_frames (); \ + set_current_frame (create_new_frame (read_register (FP_REGNUM), \ + read_pc ())); \ +} + +/* This sequence of words is the instructions + + ldmia sp!,{a1-a4} + mov lk,pc + bl *+8 + swi bkpt_swi + + Note this is 16 bytes. */ + +#define CALL_DUMMY {0xe8bd000f, 0xe1a0e00f, 0xeb000000, 0xef180000} + +#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ + +/* 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) \ +{ \ + register enum type_code code = TYPE_CODE (type); \ + register nargs_in_registers, struct_return = 0; \ + /* fix the load-arguments mask to move the first 4 or less arguments \ + into a1-a4 but make sure the structure return address in a1 is \ + not disturbed if the function is returning a structure */ \ + if ((code == TYPE_CODE_STRUCT || \ + code == TYPE_CODE_UNION || \ + code == TYPE_CODE_ARRAY) && \ + TYPE_LENGTH (type) > 4) { \ + nargs_in_registers = min(nargs + 1, 4); \ + struct_return = 1; \ + } else \ + nargs_in_registers = min(nargs, 4); \ + *(char *) dummyname = (1 << nargs_in_registers) - 1 - struct_return; \ + *(int *)((char *) dummyname + 8) = \ + (((fun - (pc + 16)) / 4) & 0x00ffffff) | 0xeb000000; } |