| /* Definitions to target GDB on an ISI Optimum V (3.05) under 4.3bsd. |
| Copyright 1987, 1989, 1991, 1993, 1999, 2000 |
| 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. */ |
| |
| /* This has not been tested on ISI's running BSD 4.2, but it will probably |
| work. */ |
| |
| /* 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. */ |
| |
| extern int isi_frame_num_args (struct frame_info *fi); |
| #define FRAME_NUM_ARGS(fi) (isi_frame_num_args ((fi))) |
| |
| /* 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; \ |
| memset (&frame_saved_regs, '\0', 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; \ |
| } |
| |
| /* The only reason this is here is the tm-isi.h reference below. It |
| was moved back here from tm-m68k.h. FIXME? */ |
| |
| extern CORE_ADDR isi_skip_prologue (CORE_ADDR); |
| #define SKIP_PROLOGUE(pc) (isi_skip_prologue (pc)) |
| |
| #include "m68k/tm-m68k.h" |
