173 lines
6.7 KiB
C
173 lines
6.7 KiB
C
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/* Parameters for execution on a Sony/NEWS, for GDB, the GNU debugger.
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Copyright (C) 1987, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* See following cpu type determination macro to get the machine type.
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Here is an m-news.h file for gdb. It supports the 68881 registers.
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by hikichi@srava.sra.junet
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* Support Sun assembly format instead of Motorola one.
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* Ptrace for handling floating register has a bug(before NEWS OS version 2.2),
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* After NEWS OS version 3.2, some of ptrace's bug is fixed.
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But we cannot change the floating register(see adb(1) in OS 3.2) yet. */
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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/* Symbols on this machine are in DBX format. */
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#define READ_DBX_FORMAT
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/* Use to compute STACK_END_ADDR. */
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#define TARGET_UPAGES 2
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#define TARGET_NBPG 4096
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/* Address of end of stack space. */
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#define STACK_END_ADDR (0x80000000 - TARGET_UPAGES * TARGET_NBPG)
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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/* when it return the floating value, use the FP0 in NEWS. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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{ if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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{ \
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REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, \
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®BUF[REGISTER_BYTE (FP0_REGNUM)], VALBUF); \
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} \
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else \
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bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)); }
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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/* when it return the floating value, use the FP0 in NEWS. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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{ if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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{ \
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char raw_buf[REGISTER_RAW_SIZE (FP0_REGNUM)]; \
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REGISTER_CONVERT_TO_RAW (FP0_REGNUM, VALBUF, raw_buf); \
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write_register_bytes (FP0_REGNUM, \
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raw_buf, REGISTER_RAW_SIZE (FP0_REGNUM)); \
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} \
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else \
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write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)); }
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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#define FRAME_NUM_ARGS(val, fi) \
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{ register CORE_ADDR pc = FRAME_SAVED_PC (fi); \
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register int insn = 0177777 & read_memory_integer (pc, 2); \
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val = 0; \
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \
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val = read_memory_integer (pc + 2, 2); \
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \
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|| (insn & 0170777) == 0050117) /* addqw */ \
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{ val = (insn >> 9) & 7; if (val == 0) val = 8; } \
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else if (insn == 0157774) /* addal #WW, sp */ \
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val = read_memory_integer (pc + 2, 4); \
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val >>= 2; }
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/* Things needed for making the inferior call functions. */
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#define PUSH_DUMMY_FRAME \
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{ register CORE_ADDR sp = read_register (SP_REGNUM); \
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register int regnum; \
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char raw_buffer[12]; \
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sp = push_word (sp, read_register (PC_REGNUM)); \
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sp = push_word (sp, read_register (FP_REGNUM)); \
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write_register (FP_REGNUM, sp); \
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
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{ read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \
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sp = push_bytes (sp, raw_buffer, 12); } \
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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sp = push_word (sp, read_register (regnum)); \
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sp = push_word (sp, read_register (PS_REGNUM)); \
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write_register (SP_REGNUM, sp); }
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME \
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{ register FRAME frame = get_current_frame (); \
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register CORE_ADDR fp; \
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register int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info *fi; \
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char raw_buffer[12]; \
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fi = get_frame_info (frame); \
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fp = fi->frame; \
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get_frame_saved_regs (fi, &fsr); \
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
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if (fsr.regs[regnum]) \
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{ read_memory (fsr.regs[regnum], raw_buffer, 12); \
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write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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if (fsr.regs[regnum]) \
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
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if (fsr.regs[PS_REGNUM]) \
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write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
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write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
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write_register (SP_REGNUM, fp + 8); \
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flush_cached_frames (); \
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set_current_frame (create_new_frame (read_register (FP_REGNUM), \
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read_pc ())); }
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/* This sequence of words is the instructions
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fmove.m #<f0-f7>,-(sp)
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movem.l 0xfffc,-(sp) ;; no save a6(fp) and a7(sp)
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clr.w -(sp)
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move.w ccr,-(sp)
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/..* The arguments are pushed at this point by GDB;
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no code is needed in the dummy for this.
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The CALL_DUMMY_START_OFFSET gives the position of
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the following jsr instruction. *../
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jbsr (#32323232)
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add.l #69696969,sp
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bpt
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nop
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Note this is 24 bytes.
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We actually start executing at the jsr, since the pushing of the
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registers is done by PUSH_DUMMY_FRAME. If this were real code,
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the arguments for the function called by the jsr would be pushed
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between the moveml and the jsr, and we could allow it to execute through.
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But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
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and we cannot allow the moveml to push the registers again lest they be
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taken for the arguments. */
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#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
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#define CALL_DUMMY_LENGTH 28
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#define CALL_DUMMY_START_OFFSET 12
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ *(int *)((char *) dummyname + 20) = nargs * 4; \
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*(int *)((char *) dummyname + 14) = fun; }
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#define HAVE_68881
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#include "tm-68k.h"
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