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Diffstat (limited to 'gdb/tm-isi.h')
| -rw-r--r-- | gdb/tm-isi.h | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/gdb/tm-isi.h b/gdb/tm-isi.h new file mode 100644 index 0000000..7697a9f --- /dev/null +++ b/gdb/tm-isi.h @@ -0,0 +1,227 @@ +/* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd. + Copyright (C) 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. */ + +/* This has not been tested on ISI's running BSD 4.2, but it will probably + work. */ + +/* 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 + +/*#define STACK_END_ADDR 0x10000000*/ +#define STACK_END_ADDR 0xfffe000 + +/* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */ + +#define DATAROUND 0x20000 +#define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \ + (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text) + +/* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */ + +#define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0) + +/* Amount PC must be decremented by after a breakpoint. + This is often the number of bytes in BREAKPOINT + but not always. + On the ISI, the kernel resets the pc to the trap instr */ + +#define DECR_PC_AFTER_BREAK 0 + + +/* Return number of args passed to a frame. + Can return -1, meaning no way to tell. */ + +#define FRAME_NUM_ARGS(val, fi) \ +{ register CORE_ADDR pc = FRAME_SAVED_PC (fi); \ + register int insn = 0177777 & read_memory_integer (pc, 2); \ + val = 0; \ + if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \ + val = read_memory_integer (pc + 2, 2); \ + else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \ + || (insn & 0170777) == 0050117) /* addqw */ \ + { val = (insn >> 9) & 7; if (val == 0) val = 8; } \ + else if (insn == 0157774) /* addal #WW, sp */ \ + val = read_memory_integer (pc + 2, 4); \ + val >>= 2; } + +/* 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; \ + register CORE_ADDR next_addr; \ + register CORE_ADDR pc; \ + register int insn; \ + register int offset; \ + bzero (&frame_saved_regs, sizeof frame_saved_regs); \ + if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \ + && (frame_info)->pc <= (frame_info)->frame) \ + { next_addr = (frame_info)->frame; \ + pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\ + else \ + { pc = get_pc_function_start ((frame_info)->pc); \ + /* Verify we have a link a6 instruction next, \ + or a branch followed by a link a6 instruction; \ + if not we lose. If we win, find the address above the saved \ + regs using the amount of storage from the link instruction. */\ +retry: \ + insn = read_memory_integer (pc, 2); \ + if (insn == 044016) \ + next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \ + else if (insn == 047126) \ + next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \ + else if ((insn & 0177400) == 060000) /* bra insn */ \ + { offset = insn & 0377; \ + pc += 2; /* advance past bra */ \ + if (offset == 0) /* bra #word */ \ + offset = read_memory_integer (pc, 2), pc += 2; \ + else if (offset == 0377) /* bra #long */ \ + offset = read_memory_integer (pc, 4), pc += 4; \ + pc += offset; \ + goto retry; \ + } else goto lose; \ + /* If have an addal #-n, sp next, adjust next_addr. */ \ + if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \ + next_addr += read_memory_integer (pc += 2, 4), pc += 4; \ + } \ + /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \ + insn = read_memory_integer (pc, 2), pc += 2; \ + regmask = read_memory_integer (pc, 2); \ + if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \ + (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \ + else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \ + (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \ + else if (insn == 0044327) /* moveml mask, (sp) */ \ + { pc += 2; \ + /* Regmask's low bit is for register 0, the first written */ \ + next_addr -= 4; \ + for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ + if (regmask & 1) \ + (frame_saved_regs).regs[regnum] = (next_addr += 4); \ + } else if (insn == 0044347) /* moveml mask, -(sp) */ \ + { pc += 2; \ + /* Regmask's low bit is for register 15, the first pushed */ \ + for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ + if (regmask & 1) \ + (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ + /* clrw -(sp); movw ccr,-(sp) may follow. */ \ + if (read_memory_integer (pc, 2) == 041147 \ + && read_memory_integer (pc+2, 2) == 042347) \ + (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \ + lose: ; \ + (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \ + (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ + (frame_saved_regs).regs[PC_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; \ + char raw_buffer[12]; \ + sp = push_word (sp, read_register (PC_REGNUM)); \ + sp = push_word (sp, read_register (FP_REGNUM)); \ + write_register (FP_REGNUM, sp); \ + for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ + { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \ + sp = push_bytes (sp, raw_buffer, 12); } \ + for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ + sp = push_word (sp, read_register (regnum)); \ + sp = push_word (sp, read_register (PS_REGNUM)); \ + write_register (SP_REGNUM, sp); } + +/* Discard from the stack the innermost frame, restoring all registers. */ + +#define POP_FRAME \ +{ register FRAME frame = get_current_frame (); \ + register CORE_ADDR fp; \ + register int regnum; \ + struct frame_saved_regs fsr; \ + struct frame_info *fi; \ + char raw_buffer[12]; \ + fi = get_frame_info (frame); \ + fp = fi->frame; \ + get_frame_saved_regs (fi, &fsr); \ + for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ + if (fsr.regs[regnum]) \ + { read_memory (fsr.regs[regnum], raw_buffer, 12); \ + write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\ + for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ + if (fsr.regs[regnum]) \ + write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ + if (fsr.regs[PS_REGNUM]) \ + write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \ + write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ + write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ + write_register (SP_REGNUM, fp + 8); \ + flush_cached_frames (); \ + set_current_frame ( create_new_frame (read_register (FP_REGNUM), \ + read_pc ())); } + +/* This sequence of words is the instructions + fmovem #<f0-f7>,-(sp) + moveml 0xfffc,-(sp) + clrw -(sp) + movew ccr,-(sp) + /..* The arguments are pushed at this point by GDB; + no code is needed in the dummy for this. + The CALL_DUMMY_START_OFFSET gives the position of + the following jsr instruction. *../ + jsr @#32323232 + addl #69696969,sp + bpt + nop +Note this is 24 bytes. +We actually start executing at the jsr, since the pushing of the +registers is done by PUSH_DUMMY_FRAME. If this were real code, +the arguments for the function called by the jsr would be pushed +between the moveml and the jsr, and we could allow it to execute through. +But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done, +and we cannot allow the moveml to push the registers again lest they be +taken for the arguments. */ + +#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71} + +#define CALL_DUMMY_LENGTH 28 + +#define CALL_DUMMY_START_OFFSET 12 + +/* 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) \ +{ *(int *)((char *) dummyname + 20) = nargs * 4; \ + *(int *)((char *) dummyname + 14) = fun; } + +#define HAVE_68881 1 + +#include "tm-68k.h" |