| /* Definitions to make GDB run on a vax under 4.2bsd. |
| Copyright 1986, 1987, 1989, 1991, 1993 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| |
| #define TARGET_BYTE_ORDER LITTLE_ENDIAN |
| |
| /* Offset from address of function to start of its code. |
| Zero on most machines. */ |
| |
| #define FUNCTION_START_OFFSET 2 |
| |
| /* Advance PC across any function entry prologue instructions |
| to reach some "real" code. */ |
| |
| extern CORE_ADDR vax_skip_prologue (CORE_ADDR); |
| #define SKIP_PROLOGUE(pc) (vax_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) FRAME_SAVED_PC(frame) |
| |
| #define TARGET_UPAGES 14 |
| #define TARGET_NBPG 512 |
| #define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG)) |
| |
| /* On the VAX, sigtramp is in the u area. Can't check the exact |
| addresses because for cross-debugging we don't have VAX include |
| files around. This should be close enough. */ |
| #define SIGTRAMP_START(pc) STACK_END_ADDR |
| #define SIGTRAMP_END(pc) 0x80000000 |
| |
| /* Stack grows downward. */ |
| |
| #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) |
| |
| /* Sequence of bytes for breakpoint instruction. */ |
| |
| #define BREAKPOINT {3} |
| |
| /* 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 |
| |
| /* Return 1 if P points to an invalid floating point value. |
| LEN is the length in bytes -- not relevant on the Vax. */ |
| |
| #define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000) |
| |
| /* 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 17 |
| |
| /* Initializer for an array of names of registers. |
| There should be NUM_REGS strings in this initializer. */ |
| |
| #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "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 12 |
| #define FP_REGNUM 13 /* Contains address of executing stack frame */ |
| #define SP_REGNUM 14 /* Contains address of top of stack */ |
| #define PC_REGNUM 15 /* Contains program counter */ |
| #define PS_REGNUM 16 /* Contains processor status */ |
| |
| /* Total amount of space needed to store our copies of the machine's |
| register state, the array `registers'. */ |
| #define REGISTER_BYTES (17*4) |
| |
| /* Index within `registers' of the first byte of the space for |
| register N. */ |
| |
| #define REGISTER_BYTE(N) ((N) * 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) 4 |
| |
| /* 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) 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 |
| |
| /* 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 (1, (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) \ |
| memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) |
| |
| /* Write into appropriate registers a function return value |
| of type TYPE, given in virtual format. */ |
| |
| #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| 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)) |
| |
| |
| /* 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. */ |
| |
| /* In the case of the Vax, the frame's nominal address is the FP value, |
| and 12 bytes later comes the saved previous FP value as a 4-byte word. */ |
| |
| #define FRAME_CHAIN(thisframe) \ |
| (!inside_entry_file ((thisframe)->pc) ? \ |
| read_memory_integer ((thisframe)->frame + 12, 4) :\ |
| 0) |
| |
| /* 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. */ |
| /* On the vax, all functions have frames. */ |
| #define FRAMELESS_FUNCTION_INVOCATION(FI) (0) |
| |
| /* Saved Pc. Get it from sigcontext if within sigtramp. */ |
| |
| /* Offset to saved PC in sigcontext, from <sys/signal.h>. */ |
| #define SIGCONTEXT_PC_OFFSET 12 |
| |
| #define FRAME_SAVED_PC(FRAME) \ |
| (((FRAME)->signal_handler_caller \ |
| ? sigtramp_saved_pc (FRAME) \ |
| : read_memory_integer ((FRAME)->frame + 16, 4)) \ |
| ) |
| |
| /* Cannot find the AP register value directly from the FP value. Must |
| find it saved in the frame called by this one, or in the AP |
| register for the innermost frame. However, there is no way to tell |
| the difference between the innermost frame and a frame for which we |
| just don't know the frame that it called (e.g. "info frame |
| 0x7ffec789"). For the sake of argument suppose that the stack is |
| somewhat trashed (which is one reason that "info frame" exists). |
| So return 0 (indicating we don't know the address of |
| the arglist) if we don't know what frame this frame calls. */ |
| #define FRAME_ARGS_ADDRESS_CORRECT(fi) \ |
| (((fi)->next \ |
| ? read_memory_integer ((fi)->next->frame + 8, 4) \ |
| : /* read_register (AP_REGNUM) */ 0)) |
| |
| /* In most of GDB, getting the args address is too important to |
| just say "I don't know". This is sometimes wrong for functions |
| that aren't on top of the stack, but c'est la vie. */ |
| #define FRAME_ARGS_ADDRESS(fi) \ |
| (((fi)->next \ |
| ? read_memory_integer ((fi)->next->frame + 8, 4) \ |
| : read_register (AP_REGNUM) /* 0 */)) |
| |
| #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
| |
| /* Return number of args passed to a frame. |
| Can return -1, meaning no way to tell. */ |
| |
| extern int vax_frame_num_args (struct frame_info *fi); |
| #define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi))) |
| |
| /* Return number of bytes at start of arglist that are not really args. */ |
| |
| #define FRAME_ARGS_SKIP 4 |
| |
| /* 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 regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \ |
| register CORE_ADDR next_addr; \ |
| memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \ |
| next_addr = (frame_info)->frame + 16; \ |
| /* Regmask's low bit is for register 0, \ |
| which is the first one that would be pushed. */ \ |
| for (regnum = 0; regnum < 12; regnum++, regmask >>= 1) \ |
| (frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0; \ |
| (frame_saved_regs).regs[SP_REGNUM] = next_addr + 4; \ |
| if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000) \ |
| (frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4); \ |
| (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16; \ |
| (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12; \ |
| (frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8; \ |
| (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \ |
| } |
| |
| /* 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; \ |
| sp = push_word (sp, 0); /* arglist */ \ |
| for (regnum = 11; regnum >= 0; regnum--) \ |
| sp = push_word (sp, read_register (regnum)); \ |
| sp = push_word (sp, read_register (PC_REGNUM)); \ |
| sp = push_word (sp, read_register (FP_REGNUM)); \ |
| sp = push_word (sp, read_register (AP_REGNUM)); \ |
| sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) \ |
| + 0x2fff0000); \ |
| sp = push_word (sp, 0); \ |
| write_register (SP_REGNUM, sp); \ |
| write_register (FP_REGNUM, sp); \ |
| write_register (AP_REGNUM, sp + 17 * sizeof (int)); } |
| |
| /* Discard from the stack the innermost frame, restoring all registers. */ |
| |
| #define POP_FRAME \ |
| { register CORE_ADDR fp = read_register (FP_REGNUM); \ |
| register int regnum; \ |
| register int regmask = read_memory_integer (fp + 4, 4); \ |
| write_register (PS_REGNUM, \ |
| (regmask & 0xffff) \ |
| | (read_register (PS_REGNUM) & 0xffff0000)); \ |
| write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); \ |
| write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); \ |
| write_register (AP_REGNUM, read_memory_integer (fp + 8, 4)); \ |
| fp += 16; \ |
| for (regnum = 0; regnum < 12; regnum++) \ |
| if (regmask & (0x10000 << regnum)) \ |
| write_register (regnum, read_memory_integer (fp += 4, 4)); \ |
| fp = fp + 4 + ((regmask >> 30) & 3); \ |
| if (regmask & 0x20000000) \ |
| { regnum = read_memory_integer (fp, 4); \ |
| fp += (regnum + 1) * 4; } \ |
| write_register (SP_REGNUM, fp); \ |
| flush_cached_frames (); \ |
| } |
| |
| /* This sequence of words is the instructions |
| calls #69, @#32323232 |
| bpt |
| Note this is 8 bytes. */ |
| |
| #define CALL_DUMMY {0x329f69fb, 0x03323232} |
| |
| #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
| |
| #define CALL_DUMMY_BREAKPOINT_OFFSET 7 |
| |
| /* 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) \ |
| { *((char *) dummyname + 1) = nargs; \ |
| *(int *)((char *) dummyname + 3) = fun; } |
| |
| /* If vax pcc says CHAR or SHORT, it provides the correct address. */ |
| |
| #define BELIEVE_PCC_PROMOTION 1 |