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Diffstat (limited to 'gdb/m-vax.h')
| -rw-r--r-- | gdb/m-vax.h | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/gdb/m-vax.h b/gdb/m-vax.h new file mode 100644 index 0000000..578af44 --- /dev/null +++ b/gdb/m-vax.h @@ -0,0 +1,375 @@ +/* Definitions to make GDB run on a vax under 4.2bsd. + Copyright (C) 1986, 1987 Free Software Foundation, Inc. + +GDB is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY. No author or distributor accepts responsibility to anyone +for the consequences of using it or for whether it serves any +particular purpose or works at all, unless he says so in writing. +Refer to the GDB General Public License for full details. + +Everyone is granted permission to copy, modify and redistribute GDB, +but only under the conditions described in the GDB General Public +License. A copy of this license is supposed to have been given to you +along with GDB so you can know your rights and responsibilities. It +should be in a file named COPYING. Among other things, the copyright +notice and this notice must be preserved on all copies. + +In other words, go ahead and share GDB, but don't try to stop +anyone else from sharing it farther. Help stamp out software hoarding! +*/ + +#ifndef vax +#define vax +#endif + +/* Get rid of any system-imposed stack limit if possible. */ + +#define SET_STACK_LIMIT_HUGE + +/* 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 2 + +/* Advance PC across any function entry prologue instructions + to reach some "real" code. */ + +#define SKIP_PROLOGUE(pc) \ +{ register int op = read_memory_integer (pc, 1); \ + if (op == 0x11) pc += 2; /* skip brb */ \ + if (op == 0x31) pc += 3; /* skip brw */ \ +} + +/* 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) + +/* This is the amount to subtract from u.u_ar0 + to get the offset in the core file of the register values. */ + +#define KERNEL_U_ADDR (0x80000000 - (UPAGES * NBPG)) + +/* Address of end of stack space. */ + +#define STACK_END_ADDR (0x80000000 - (UPAGES * NBPG)) + +/* Stack grows downward. */ + +#define INNER_THAN < + +/* 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 + +/* Nonzero if instruction at PC is a return instruction. */ + +#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 04) + +/* 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. */ + +#define REGISTER_TYPE long + +/* 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 */ + +#define REGISTER_U_ADDR(addr, blockend, regno) \ +{ addr = blockend - 0110 + regno * 4; \ + if (regno == PC_REGNUM) addr = blockend - 8; \ + if (regno == PS_REGNUM) addr = blockend - 4; \ + if (regno == FP_REGNUM) addr = blockend - 0120; \ + if (regno == AP_REGNUM) addr = blockend - 0124; \ + if (regno == SP_REGNUM) addr = blockend - 20; } + +/* 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 + +/* Nonzero if register N requires conversion + from raw format to virtual format. */ + +#define REGISTER_CONVERTIBLE(N) 0 + +/* Convert data from raw format for register REGNUM + to virtual format for register REGNUM. */ + +#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ + 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) \ + bcopy ((FROM), (TO), 4); + +/* Return the GDB type object for the "standard" data type + of data in register N. */ + +#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int + +/* 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) \ + 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) \ + 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. + + 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 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) (read_memory_integer (thisframe + 12, 4)) + +#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. */ + +#define FRAME_SAVED_PC(frame) (read_memory_integer (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. */ +#define FRAME_ARGS_ADDRESS(fi) \ + (((fi).next_frame \ + ? read_memory_integer ((fi).next_frame + 8, 4) \ + : read_register (AP_REGNUM))) + +#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 = (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); } + +/* 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; \ + bzero (&frame_saved_regs, 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); \ + set_current_frame (read_register (FP_REGNUM)); } + +/* 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 */ + +/* 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, fun, nargs) \ +{ *((char *) dummyname + 1) = nargs; \ + *(int *)((char *) dummyname + 3) = fun; } + +/* Interface definitions for kernel debugger KDB. */ + +/* Map machine fault codes into signal numbers. + First subtract 0, divide by 4, then index in a table. + Faults for which the entry in this table is 0 + are not handled by KDB; the program's own trap handler + gets to handle then. */ + +#define FAULT_CODE_ORIGIN 0 +#define FAULT_CODE_UNITS 4 +#define FAULT_TABLE \ +{ 0, SIGKILL, SIGSEGV, 0, 0, 0, 0, 0, \ + 0, 0, SIGTRAP, SIGTRAP, 0, 0, 0, 0, \ + 0, 0, 0, 0, 0, 0, 0, 0} + +/* Start running with a stack stretching from BEG to END. + BEG and END should be symbols meaningful to the assembler. + This is used only for kdb. */ + +#define INIT_STACK(beg, end) \ +{ asm (".globl end"); \ + asm ("movl $ end, sp"); \ + asm ("clrl fp"); } + +/* Push the frame pointer register on the stack. */ +#define PUSH_FRAME_PTR \ + asm ("pushl fp"); + +/* Copy the top-of-stack to the frame pointer register. */ +#define POP_FRAME_PTR \ + asm ("movl (sp), fp"); + +/* After KDB is entered by a fault, push all registers + that GDB thinks about (all NUM_REGS of them), + so that they appear in order of ascending GDB register number. + The fault code will be on the stack beyond the last register. */ + +#define PUSH_REGISTERS \ +{ asm ("pushl 8(sp)"); \ + asm ("pushl 8(sp)"); \ + asm ("pushal 0x14(sp)"); \ + asm ("pushr $037777"); } + +/* Assuming the registers (including processor status) have been + pushed on the stack in order of ascending GDB register number, + restore them and return to the address in the saved PC register. */ + +#define POP_REGISTERS \ +{ asm ("popr $037777"); \ + asm ("subl2 $8,(sp)"); \ + asm ("movl (sp),sp"); \ + asm ("rei"); } |