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Diffstat (limited to 'gdb/config/vax/tm-vax.h')
| -rw-r--r-- | gdb/config/vax/tm-vax.h | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/gdb/config/vax/tm-vax.h b/gdb/config/vax/tm-vax.h new file mode 100644 index 00000000000..ad10fb7de3f --- /dev/null +++ b/gdb/config/vax/tm-vax.h @@ -0,0 +1,330 @@ +/* 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. */ + +#define SKIP_PROLOGUE(pc) \ +{ register int op = (unsigned char) read_memory_integer (pc, 1); \ + if (op == 0x11) pc += 2; /* skip brb */ \ + if (op == 0x31) pc += 3; /* skip brw */ \ + if (op == 0xC2 && \ + ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5E) \ + pc += 3; /* skip subl2 */ \ + if (op == 0x9E && \ + ((unsigned char) read_memory_integer (pc+1, 1)) == 0xAE && \ + ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5E) \ + pc += 4; /* skip movab */ \ + if (op == 0x9E && \ + ((unsigned char) read_memory_integer (pc+1, 1)) == 0xCE && \ + ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5E) \ + pc += 5; /* skip movab */ \ + if (op == 0x9E && \ + ((unsigned char) read_memory_integer (pc+1, 1)) == 0xEE && \ + ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5E) \ + pc += 7; /* skip movab */ \ +} + +/* 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, FRAMELESS) {(FRAMELESS) = 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. */ + +#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; \ + 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 |