378 lines
10 KiB
C
378 lines
10 KiB
C
/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
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Copyright 1996, 1997 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "obstack.h"
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#include "target.h"
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#include "value.h"
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#include "bfd.h"
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#include "gdb_string.h"
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#include "gdbcore.h"
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#include "symfile.h"
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/* Info gleaned from scanning a function's prologue. */
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struct pifsr /* Info about one saved reg */
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{
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int framereg; /* Frame reg (SP or FP) */
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int offset; /* Offset from framereg */
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int reg; /* Saved register number */
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};
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struct prologue_info
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{
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int framereg;
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int frameoffset;
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int start_function;
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struct pifsr *pifsrs;
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};
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/* Function: frame_chain
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Figure out and return the caller's frame pointer given current
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frame_info struct.
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We start out knowing the current pc, current sp, current fp.
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We want to determine the caller's fp and caller's pc. To do this
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correctly, we have to be able to handle the case where we are in the
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middle of the prologue which involves scanning the prologue.
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We don't handle dummy frames yet but we would probably just return the
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stack pointer that was in use at the time the function call was made?
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*/
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CORE_ADDR
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mn10300_frame_chain (fi)
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struct frame_info *fi;
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{
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struct prologue_info pi;
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CORE_ADDR callers_pc, callers_fp, curr_sp;
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CORE_ADDR past_prologue_addr;
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int past_prologue = 1; /* default to being past prologue */
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int n_movm_args = 4;
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struct pifsr *pifsr, *pifsr_tmp;
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/* current pc is fi->pc */
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/* current fp is fi->frame */
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/* current sp is: */
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curr_sp = read_register (SP_REGNUM);
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/*
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printf("curr pc = 0x%x ; curr fp = 0x%x ; curr sp = 0x%x\n",
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fi->pc, fi->frame, curr_sp);
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*/
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/* first inst after prologue is: */
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past_prologue_addr = mn10300_skip_prologue (fi->pc);
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/* Are we in the prologue? */
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/* Yes if mn10300_skip_prologue returns an address after the
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current pc in which case we have to scan prologue */
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if (fi->pc < mn10300_skip_prologue (fi->pc))
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past_prologue = 0;
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/* scan prologue if we're not past it */
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if (!past_prologue)
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{
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/* printf("scanning prologue\n"); */
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/* FIXME -- fill out this case later */
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return 0x0; /* bogus value */
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}
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if (past_prologue) /* if we don't need to scan the prologue */
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{
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/* printf("we're past the prologue\n"); */
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callers_pc = fi->frame - REGISTER_SIZE;
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callers_fp = fi->frame - ((n_movm_args + 1) * REGISTER_SIZE);
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/*
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printf("callers_pc = 0x%x ; callers_fp = 0x%x\n",
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callers_pc, callers_fp);
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printf("*callers_pc = 0x%x ; *callers_fp = 0x%x\n",
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read_memory_integer(callers_pc, REGISTER_SIZE),
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read_memory_integer(callers_fp, REGISTER_SIZE));
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*/
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return read_memory_integer(callers_fp, REGISTER_SIZE);
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}
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/* we don't get here */
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}
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/* Function: find_callers_reg
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Find REGNUM on the stack. Otherwise, it's in an active register.
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One thing we might want to do here is to check REGNUM against the
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clobber mask, and somehow flag it as invalid if it isn't saved on
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the stack somewhere. This would provide a graceful failure mode
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when trying to get the value of caller-saves registers for an inner
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frame. */
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CORE_ADDR
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mn10300_find_callers_reg (fi, regnum)
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struct frame_info *fi;
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int regnum;
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{
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/* printf("mn10300_find_callers_reg\n"); */
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for (; fi; fi = fi->next)
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if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
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return generic_read_register_dummy (fi->pc, fi->frame, regnum);
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else if (fi->fsr.regs[regnum] != 0)
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return read_memory_unsigned_integer (fi->fsr.regs[regnum],
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REGISTER_RAW_SIZE(regnum));
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return read_register (regnum);
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}
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/* Function: skip_prologue
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Return the address of the first inst past the prologue of the function.
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*/
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CORE_ADDR
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mn10300_skip_prologue (pc)
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CORE_ADDR pc;
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{
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CORE_ADDR func_addr, func_end;
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/* printf("mn10300_skip_prologue\n"); */
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/* See what the symbol table says */
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if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
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{
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struct symtab_and_line sal;
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sal = find_pc_line (func_addr, 0);
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if (sal.line != 0 && sal.end < func_end)
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return sal.end;
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else
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/* Either there's no line info, or the line after the prologue is after
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the end of the function. In this case, there probably isn't a
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prologue. */
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return pc;
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}
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/* We can't find the start of this function, so there's nothing we can do. */
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return pc;
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}
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/* Function: pop_frame
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This routine gets called when either the user uses the `return'
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command, or the call dummy breakpoint gets hit. */
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void
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mn10300_pop_frame (frame)
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struct frame_info *frame;
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{
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int regnum;
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/* printf("mn10300_pop_frame start\n"); */
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if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
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generic_pop_dummy_frame ();
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else
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{
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write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
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for (regnum = 0; regnum < NUM_REGS; regnum++)
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if (frame->fsr.regs[regnum] != 0)
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write_register (regnum,
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read_memory_unsigned_integer (frame->fsr.regs[regnum],
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REGISTER_RAW_SIZE(regnum)));
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write_register (SP_REGNUM, FRAME_FP (frame));
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}
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flush_cached_frames ();
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/* printf("mn10300_pop_frame end\n"); */
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}
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/* Function: push_arguments
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Setup arguments for a call to the target. Arguments go in
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order on the stack.
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*/
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CORE_ADDR
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mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
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int nargs;
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value_ptr *args;
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CORE_ADDR sp;
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unsigned char struct_return;
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CORE_ADDR struct_addr;
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{
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int argnum = 0;
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int len = 0;
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int stack_offset = 0; /* copy args to this offset onto stack */
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/* printf("mn10300_push_arguments start\n"); */
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/* First, just for safety, make sure stack is aligned */
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sp &= ~3;
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/* Now make space on the stack for the args. */
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for (argnum = 0; argnum < nargs; argnum++)
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len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
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sp -= len;
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/* Push all arguments onto the stack. */
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for (argnum = 0; argnum < nargs; argnum++)
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{
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int len;
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char *val;
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if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
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&& TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
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{
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/* for now, pretend structs aren't special */
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len = TYPE_LENGTH (VALUE_TYPE (*args));
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val = (char *)VALUE_CONTENTS (*args);
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}
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else
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{
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len = TYPE_LENGTH (VALUE_TYPE (*args));
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val = (char *)VALUE_CONTENTS (*args);
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}
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while (len > 0)
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{
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write_memory (sp + stack_offset, val, 4);
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len -= 4;
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val += 4;
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stack_offset += 4;
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}
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args++;
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}
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/* printf"mn10300_push_arguments end\n"); */
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return sp;
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}
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/* Function: push_return_address (pc)
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Set up the return address for the inferior function call.
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Needed for targets where we don't actually execute a JSR/BSR instruction */
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CORE_ADDR
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mn10300_push_return_address (pc, sp)
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CORE_ADDR pc;
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CORE_ADDR sp;
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{
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/* printf("mn10300_push_return_address\n"); */
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/* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
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return sp;
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}
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/* Function: frame_saved_pc
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Find the caller of this frame. We do this by seeing if RP_REGNUM
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is saved in the stack anywhere, otherwise we get it from the
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registers. If the inner frame is a dummy frame, return its PC
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instead of RP, because that's where "caller" of the dummy-frame
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will be found. */
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CORE_ADDR
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mn10300_frame_saved_pc (fi)
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struct frame_info *fi;
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{
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/* printf("mn10300_frame_saved_pc\n"); */
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return (read_memory_integer(fi->frame - REGISTER_SIZE, REGISTER_SIZE));
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}
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void
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get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
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char *raw_buffer;
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int *optimized;
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CORE_ADDR *addrp;
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struct frame_info *frame;
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int regnum;
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enum lval_type *lval;
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{
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/* printf("get_saved_register\n"); */
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generic_get_saved_register (raw_buffer, optimized, addrp,
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frame, regnum, lval);
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}
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/* Function: init_extra_frame_info
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Setup the frame's frame pointer, pc, and frame addresses for saved
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registers. Most of the work is done in frame_chain().
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Note that when we are called for the last frame (currently active frame),
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that fi->pc and fi->frame will already be setup. However, fi->frame will
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be valid only if this routine uses FP. For previous frames, fi-frame will
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always be correct (since that is derived from v850_frame_chain ()).
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We can be called with the PC in the call dummy under two circumstances.
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First, during normal backtracing, second, while figuring out the frame
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pointer just prior to calling the target function (see run_stack_dummy).
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*/
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void
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mn10300_init_extra_frame_info (fi)
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struct frame_info *fi;
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{
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struct prologue_info pi;
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struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
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int reg;
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if (fi->next)
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fi->pc = FRAME_SAVED_PC (fi->next);
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memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
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/* The call dummy doesn't save any registers on the stack, so we can return
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now. */
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/*
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if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
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return;
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pi.pifsrs = pifsrs;
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*/
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/* v850_scan_prologue (fi->pc, &pi); */
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/*
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if (!fi->next && pi.framereg == SP_REGNUM)
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fi->frame = read_register (pi.framereg) - pi.frameoffset;
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for (pifsr = pifsrs; pifsr->framereg; pifsr++)
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{
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fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
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if (pifsr->framereg == SP_REGNUM)
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fi->fsr.regs[pifsr->reg] += pi.frameoffset;
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}
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*/
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/* printf("init_extra_frame_info\n"); */
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}
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void
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_initialize_mn10300_tdep ()
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{
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/* printf("_initialize_mn10300_tdep\n"); */
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tm_print_insn = print_insn_mn10300;
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}
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