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- /* Definitions to make GDB target for an ARM under RISCiX (4.3bsd).
- Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
-
- 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., 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
-
- /* 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.
-
- However, if FRAME_CHAIN_VALID returns zero,
- it means the given frame is the outermost one and has no caller. */
-
- /* 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 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; }
-