672 lines
20 KiB
C
672 lines
20 KiB
C
/* Target-dependent code for the Fujitsu FR30.
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Copyright 1996, 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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__t(int l, char *s, int a)
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{
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fprintf(stderr, "(%d): %s: 0x%08x\n", l, s, a);
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}
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#define T(s, a) __t(__LINE__, s, (int)(a))
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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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fr30_pop_frame ()
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{
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struct frame_info *frame = get_current_frame();
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int regnum;
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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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}
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/* Function: skip_prologue
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Return the address of the first code past the prologue of the function. */
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CORE_ADDR
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fr30_skip_prologue(CORE_ADDR pc)
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{
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CORE_ADDR func_addr, func_end;
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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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}
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}
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/* Either we didn't find the start of this function (nothing we can do),
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or there's no line info, or the line after the prologue is after
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the end of the function (there probably isn't a prologue). */
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return pc;
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}
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CORE_ADDR
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fr30_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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int struct_return;
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CORE_ADDR struct_addr;
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{
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int argreg;
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int argnum;
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int stack_offset;
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struct stack_arg {
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char *val;
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int len;
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int offset;
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};
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struct stack_arg *stack_args =
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(struct stack_arg*)alloca (nargs * sizeof (struct stack_arg));
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int nstack_args = 0;
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argreg = FIRST_ARGREG;
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/* the struct_return pointer occupies the first parameter-passing reg */
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if (struct_return)
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write_register (argreg++, struct_addr);
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#if(0)
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/* The offset onto the stack at which we will start copying parameters
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(after the registers are used up) begins at 16 in the old ABI.
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This leaves room for the "home" area for register parameters. */
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stack_offset = REGISTER_SIZE * 4;
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#else
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/* XXX which ABI are we using ? Z.R. */
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stack_offset = 0;
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#endif
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/* Process args from left to right. Store as many as allowed in
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registers, save the rest to be pushed on the stack */
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for(argnum = 0; argnum < nargs; argnum++)
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{
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char * val;
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value_ptr arg = args[argnum];
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struct type * arg_type = check_typedef (VALUE_TYPE (arg));
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struct type * target_type = TYPE_TARGET_TYPE (arg_type);
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int len = TYPE_LENGTH (arg_type);
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enum type_code typecode = TYPE_CODE (arg_type);
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CORE_ADDR regval;
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int newarg;
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val = (char *) VALUE_CONTENTS (arg);
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{
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/* Copy the argument to general registers or the stack in
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register-sized pieces. Large arguments are split between
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registers and stack. */
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while (len > 0)
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{
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if (argreg <= LAST_ARGREG)
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{
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int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
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regval = extract_address (val, partial_len);
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/* It's a simple argument being passed in a general
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register. */
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write_register (argreg, regval);
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argreg++;
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len -= partial_len;
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val += partial_len;
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}
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else
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{
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/* keep for later pushing */
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stack_args[nstack_args].val = val;
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stack_args[nstack_args++].len = len;
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break;
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}
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}
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}
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}
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/* now do the real stack pushing, process args right to left */
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while(nstack_args--)
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{
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sp -= stack_args[nstack_args].len;
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write_memory(sp, stack_args[nstack_args].val,
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stack_args[nstack_args].len);
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}
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/* Return adjusted stack pointer. */
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return sp;
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}
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_initialize_fr30_tdep()
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{
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extern int print_insn_fr30(bfd_vma, disassemble_info *);
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tm_print_insn = print_insn_fr30;
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}
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/* Function: check_prologue_cache
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Check if prologue for this frame's PC has already been scanned.
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If it has, copy the relevant information about that prologue and
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return non-zero. Otherwise do not copy anything and return zero.
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The information saved in the cache includes:
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* the frame register number;
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* the size of the stack frame;
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* the offsets of saved regs (relative to the old SP); and
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* the offset from the stack pointer to the frame pointer
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The cache contains only one entry, since this is adequate
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for the typical sequence of prologue scan requests we get.
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When performing a backtrace, GDB will usually ask to scan
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the same function twice in a row (once to get the frame chain,
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and once to fill in the extra frame information).
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*/
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static struct frame_info prologue_cache;
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static int
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check_prologue_cache (fi)
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struct frame_info * fi;
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{
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int i;
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if (fi->pc == prologue_cache.pc)
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{
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fi->framereg = prologue_cache.framereg;
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fi->framesize = prologue_cache.framesize;
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fi->frameoffset = prologue_cache.frameoffset;
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for (i = 0; i <= NUM_REGS; i++)
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fi->fsr.regs[i] = prologue_cache.fsr.regs[i];
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return 1;
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}
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else
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return 0;
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}
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/* Function: save_prologue_cache
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Copy the prologue information from fi to the prologue cache.
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*/
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static void
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save_prologue_cache (fi)
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struct frame_info * fi;
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{
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int i;
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prologue_cache.pc = fi->pc;
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prologue_cache.framereg = fi->framereg;
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prologue_cache.framesize = fi->framesize;
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prologue_cache.frameoffset = fi->frameoffset;
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for (i = 0; i <= NUM_REGS; i++)
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prologue_cache.fsr.regs[i] = fi->fsr.regs[i];
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}
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/* Function: scan_prologue
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Scan the prologue of the function that contains PC, and record what
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we find in PI. PI->fsr must be zeroed by the called. Returns the
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pc after the prologue. Note that the addresses saved in pi->fsr
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are actually just frame relative (negative offsets from the frame
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pointer). This is because we don't know the actual value of the
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frame pointer yet. In some circumstances, the frame pointer can't
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be determined till after we have scanned the prologue. */
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static void
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fr30_scan_prologue (fi)
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struct frame_info * fi;
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{
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int sp_offset, fp_offset;
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CORE_ADDR prologue_start, prologue_end, current_pc;
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/* Check if this function is already in the cache of frame information. */
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if (check_prologue_cache (fi))
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return;
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/* Assume there is no frame until proven otherwise. */
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fi->framereg = SP_REGNUM;
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fi->framesize = 0;
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fi->frameoffset = 0;
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/* Find the function prologue. If we can't find the function in
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the symbol table, peek in the stack frame to find the PC. */
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if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
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{
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/* Assume the prologue is everything between the first instruction
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in the function and the first source line. */
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struct symtab_and_line sal = find_pc_line (prologue_start, 0);
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if (sal.line == 0) /* no line info, use current PC */
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prologue_end = fi->pc;
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else if (sal.end < prologue_end) /* next line begins after fn end */
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prologue_end = sal.end; /* (probably means no prologue) */
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}
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else
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{
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T("NIY", 0);
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/* XXX ??? Z.R. Get address of the stmfd in the prologue of the callee; the saved
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PC is the address of the stmfd + 12. */
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prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12;
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prologue_end = prologue_start + 40; /* FIXME: should be big enough */
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}
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/* Now search the prologue looking for instructions that set up the
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frame pointer, adjust the stack pointer, and save registers. */
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sp_offset = fp_offset = 0;
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for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2)
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{
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unsigned int insn;
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insn = read_memory_unsigned_integer (current_pc, 2);
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if ((insn & 0xfe00) == 0x8e00) /* stm0 or stm1 */
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{
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int reg, mask = insn & 0xff;
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/* scan in one sweep - create virtual 16-bit mask from either insn's mask */
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if((insn & 0x0100) == 0)
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{
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mask <<= 8; /* stm0 - move to upper byte in virtual mask */
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}
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/* Calculate offsets of saved registers (to be turned later into addresses). */
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for (reg = R4_REGNUM; reg <= R11_REGNUM; reg++)
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if (mask & (1 << (15 - reg)))
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{
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sp_offset -= 4;
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fi->fsr.regs[reg] = sp_offset;
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}
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}
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else if((insn & 0xff00) == 0x0f00) /* enter */
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{
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fp_offset = fi->fsr.regs[FP_REGNUM] = sp_offset - 4;
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sp_offset -= 4 * (insn & 0xff);
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fi->framereg = FP_REGNUM;
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}
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else if(insn == 0x1781) /* st rp,@-sp */
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{
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sp_offset -= 4;
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fi->fsr.regs[RP_REGNUM] = sp_offset;
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}
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else if(insn == 0x170e) /* st fp,@-sp */
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{
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sp_offset -= 4;
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fi->fsr.regs[FP_REGNUM] = sp_offset;
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}
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else if(insn == 0x8bfe) /* mov sp,fp */
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{
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fi->framereg = FP_REGNUM;
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}
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else if((insn & 0xff00) == 0xa300) /* addsp xx */
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{
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sp_offset += 4 * (signed char)(insn & 0xff);
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}
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else if((insn & 0xff0f) == 0x9b00 && /* ldi:20 xx,r0 */
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read_memory_unsigned_integer(current_pc+4, 2)
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== 0xac0f) /* sub r0,sp */
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{
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/* large stack adjustment */
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sp_offset -= (((insn & 0xf0) << 12) | read_memory_unsigned_integer(current_pc+2, 2));
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current_pc += 4;
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}
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else if(insn == 0x9f80 && /* ldi:32 xx,r0 */
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read_memory_unsigned_integer(current_pc+6, 2)
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== 0xac0f) /* sub r0,sp */
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{
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/* large stack adjustment */
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sp_offset -=
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(read_memory_unsigned_integer(current_pc+2, 2) << 16 |
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read_memory_unsigned_integer(current_pc+4, 2));
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current_pc += 6;
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}
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}
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/* The frame size is just the negative of the offset (from the original SP)
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of the last thing thing we pushed on the stack. The frame offset is
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[new FP] - [new SP]. */
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fi->framesize = -sp_offset;
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fi->frameoffset = fp_offset - sp_offset;
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save_prologue_cache (fi);
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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 scan_prologue().
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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 fr30_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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void
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fr30_init_extra_frame_info (fi)
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struct frame_info * fi;
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{
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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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if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
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{
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/* We need to setup fi->frame here because run_stack_dummy gets it wrong
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by assuming it's always FP. */
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fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
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fi->framesize = 0;
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fi->frameoffset = 0;
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return;
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}
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fr30_scan_prologue (fi);
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if (!fi->next) /* this is the innermost frame? */
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fi->frame = read_register (fi->framereg);
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else /* not the innermost frame */
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/* If we have an FP, the callee saved it. */
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if (fi->framereg == FP_REGNUM)
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if (fi->next->fsr.regs[fi->framereg] != 0)
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fi->frame = read_memory_integer (fi->next->fsr.regs[fi->framereg],
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4);
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/* Calculate actual addresses of saved registers using offsets determined
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by fr30_scan_prologue. */
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for (reg = 0; reg < NUM_REGS; reg++)
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if (fi->fsr.regs[reg] != 0)
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fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset;
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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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fr30_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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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: frame_chain
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Figure out the frame prior to FI. Unfortunately, this involves
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scanning the prologue of the caller, which will also be done
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shortly by fr30_init_extra_frame_info. For the dummy frame, we
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just return the stack pointer that was in use at the time the
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function call was made. */
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CORE_ADDR
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fr30_frame_chain (fi)
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struct frame_info * fi;
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{
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CORE_ADDR fn_start, callers_pc, fp;
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struct frame_info caller_fi;
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int framereg;
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/* is this a dummy frame? */
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if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
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return fi->frame; /* dummy frame same as caller's frame */
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/* is caller-of-this a dummy frame? */
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callers_pc = FRAME_SAVED_PC(fi); /* find out who called us: */
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fp = fr30_find_callers_reg (fi, FP_REGNUM);
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if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
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return fp; /* dummy frame's frame may bear no relation to ours */
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if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
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if (fn_start == entry_point_address ())
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return 0; /* in _start fn, don't chain further */
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framereg = fi->framereg;
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/* If the caller is the startup code, we're at the end of the chain. */
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if (find_pc_partial_function (callers_pc, 0, &fn_start, 0))
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if (fn_start == entry_point_address ())
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return 0;
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memset (& caller_fi, 0, sizeof (caller_fi));
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caller_fi.pc = callers_pc;
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fr30_scan_prologue (& caller_fi);
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framereg = caller_fi.framereg;
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/* If the caller used a frame register, return its value.
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Otherwise, return the caller's stack pointer. */
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if (framereg == FP_REGNUM)
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return fr30_find_callers_reg (fi, framereg);
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else
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return fi->frame + fi->framesize;
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}
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/* Function: push_arguments
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Setup arguments and RP for a call to the target. First four args
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go in R4->R7, subsequent args go on stack... Structs
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are passed by reference. 64 bit quantities (doubles and long
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longs) may be split between the regs and the stack. When calling a
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function that returns a struct, a pointer to the struct is passed
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in as a secret first argument (always in R6).
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Stack space for the args has NOT been allocated: that job is up to us.
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*/
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#if(0) /* Z.R. XXX */
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CORE_ADDR
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fr30_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 argreg;
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int argnum;
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int len = 0;
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int stack_offset;
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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; /* possibly over-allocating, but it works... */
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/* (you might think we could allocate 16 bytes */
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/* less, but the ABI seems to use it all! ) */
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argreg = ARG0_REGNUM;
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/* the struct_return pointer occupies the first parameter-passing reg */
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if (struct_return)
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write_register (argreg++, struct_addr);
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stack_offset = 16;
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/* The offset onto the stack at which we will start copying parameters
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(after the registers are used up) begins at 16 rather than at zero.
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I don't really know why, that's just the way it seems to work. */
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/* Now load as many as possible of the first arguments into
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registers, and push the rest onto the stack. There are 16 bytes
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in four registers available. Loop thru args from first to last. */
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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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char valbuf[REGISTER_RAW_SIZE(ARG0_REGNUM)];
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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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store_address (valbuf, 4, VALUE_ADDRESS (*args));
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len = 4;
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val = valbuf;
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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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if (argreg <= ARGLAST_REGNUM)
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{
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CORE_ADDR regval;
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regval = extract_address (val, REGISTER_RAW_SIZE (argreg));
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write_register (argreg, regval);
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len -= REGISTER_RAW_SIZE (argreg);
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val += REGISTER_RAW_SIZE (argreg);
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argreg++;
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}
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else
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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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return sp;
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}
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#endif /* Z.R. */
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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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fr30_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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T("fr30_push_return_address", CALL_DUMMY_ADDRESS ());
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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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fr30_frame_saved_pc (fi)
|
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struct frame_info *fi;
|
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{
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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, PC_REGNUM);
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else
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return fr30_find_callers_reg (fi, RP_REGNUM);
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}
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|
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#if(0) /* Z.R. XXX */
|
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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;
|
|
int *optimized;
|
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CORE_ADDR *addrp;
|
|
struct frame_info *frame;
|
|
int regnum;
|
|
enum lval_type *lval;
|
|
{
|
|
generic_get_saved_register (raw_buffer, optimized, addrp,
|
|
frame, regnum, lval);
|
|
}
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|
#endif /* Z.R. */
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|
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|
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/* Function: fix_call_dummy
|
|
Pokes the callee function's address into the CALL_DUMMY assembly stub.
|
|
Assumes that the CALL_DUMMY looks like this:
|
|
jarl <offset24>, r31
|
|
trap
|
|
*/
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|
|
|
int
|
|
fr30_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
|
|
char *dummy;
|
|
CORE_ADDR sp;
|
|
CORE_ADDR fun;
|
|
int nargs;
|
|
value_ptr *args;
|
|
struct type *type;
|
|
int gcc_p;
|
|
{
|
|
long offset24;
|
|
|
|
offset24 = (long) fun - (long) entry_point_address ();
|
|
offset24 &= 0x3fffff;
|
|
offset24 |= 0xff800000; /* jarl <offset24>, r31 */
|
|
|
|
store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
|
|
store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
|
|
return 0;
|
|
}
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|