d747e0af3d
* All GDB files that #include defs.h: Removed stdio.h. (defs.h): #include stdio.h. This has been tested by building GDBs for all targets hosted on Sun4. None of the build problems were related to stdio.h inclusion. (n.b. many configurations don't build for other reasons.)
696 lines
19 KiB
C
696 lines
19 KiB
C
/* Target-machine dependent code for the AMD 29000
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Copyright 1990, 1991 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Written by Jim Kingdon.
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "frame.h"
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#include "value.h"
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#include "symtab.h"
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#include "inferior.h"
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extern CORE_ADDR text_start; /* FIXME, kludge... */
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/* Structure to hold cached info about function prologues. */
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struct prologue_info
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{
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CORE_ADDR pc; /* First addr after fn prologue */
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unsigned rsize, msize; /* register stack frame size, mem stack ditto */
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unsigned mfp_used : 1; /* memory frame pointer used */
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unsigned rsize_valid : 1; /* Validity bits for the above */
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unsigned msize_valid : 1;
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unsigned mfp_valid : 1;
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};
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/* Examine the prologue of a function which starts at PC. Return
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the first addess past the prologue. If MSIZE is non-NULL, then
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set *MSIZE to the memory stack frame size. If RSIZE is non-NULL,
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then set *RSIZE to the register stack frame size (not including
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incoming arguments and the return address & frame pointer stored
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with them). If no prologue is found, *RSIZE is set to zero.
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If no prologue is found, or a prologue which doesn't involve
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allocating a memory stack frame, then set *MSIZE to zero.
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Note that both msize and rsize are in bytes. This is not consistent
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with the _User's Manual_ with respect to rsize, but it is much more
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convenient.
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If MFP_USED is non-NULL, *MFP_USED is set to nonzero if a memory
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frame pointer is being used. */
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CORE_ADDR
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examine_prologue (pc, rsize, msize, mfp_used)
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CORE_ADDR pc;
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unsigned *msize;
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unsigned *rsize;
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int *mfp_used;
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{
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long insn;
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CORE_ADDR p = pc;
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struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (pc);
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struct prologue_info *mi = 0;
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if (msymbol != NULL)
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mi = (struct prologue_info *) msymbol -> misc_info;
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if (mi != 0)
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{
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int valid = 1;
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if (rsize != NULL)
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{
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*rsize = mi->rsize;
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valid &= mi->rsize_valid;
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}
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if (msize != NULL)
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{
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*msize = mi->msize;
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valid &= mi->msize_valid;
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}
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if (mfp_used != NULL)
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{
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*mfp_used = mi->mfp_used;
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valid &= mi->mfp_valid;
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}
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if (valid)
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return mi->pc;
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}
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if (rsize != NULL)
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*rsize = 0;
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if (msize != NULL)
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*msize = 0;
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if (mfp_used != NULL)
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*mfp_used = 0;
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/* Prologue must start with subtracting a constant from gr1.
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Normally this is sub gr1,gr1,<rsize * 4>. */
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insn = read_memory_integer (p, 4);
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if ((insn & 0xffffff00) != 0x25010100)
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{
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/* If the frame is large, instead of a single instruction it
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might be a pair of instructions:
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const <reg>, <rsize * 4>
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sub gr1,gr1,<reg>
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*/
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int reg;
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/* Possible value for rsize. */
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unsigned int rsize0;
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if ((insn & 0xff000000) != 0x03000000)
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{
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p = pc;
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goto done;
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}
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reg = (insn >> 8) & 0xff;
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rsize0 = (((insn >> 8) & 0xff00) | (insn & 0xff));
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p += 4;
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insn = read_memory_integer (p, 4);
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if ((insn & 0xffffff00) != 0x24010100
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|| (insn & 0xff) != reg)
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{
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p = pc;
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goto done;
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}
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if (rsize != NULL)
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*rsize = rsize0;
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}
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else
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{
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if (rsize != NULL)
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*rsize = (insn & 0xff);
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}
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p += 4;
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/* Next instruction must be asgeu V_SPILL,gr1,rab. */
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insn = read_memory_integer (p, 4);
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if (insn != 0x5e40017e)
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{
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p = pc;
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goto done;
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}
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p += 4;
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/* Next instruction usually sets the frame pointer (lr1) by adding
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<size * 4> from gr1. However, this can (and high C does) be
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deferred until anytime before the first function call. So it is
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OK if we don't see anything which sets lr1. */
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/* Normally this is just add lr1,gr1,<size * 4>. */
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insn = read_memory_integer (p, 4);
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if ((insn & 0xffffff00) == 0x15810100)
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p += 4;
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else
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{
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/* However, for large frames it can be
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const <reg>, <size *4>
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add lr1,gr1,<reg>
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*/
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int reg;
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CORE_ADDR q;
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if ((insn & 0xff000000) == 0x03000000)
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{
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reg = (insn >> 8) & 0xff;
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q = p + 4;
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insn = read_memory_integer (q, 4);
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if ((insn & 0xffffff00) == 0x14810100
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&& (insn & 0xff) == reg)
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p = q;
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}
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}
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/* Next comes "add lr{<rsize-1>},msp,0", but only if a memory
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frame pointer is in use. We just check for add lr<anything>,msp,0;
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we don't check this rsize against the first instruction, and
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we don't check that the trace-back tag indicates a memory frame pointer
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is in use.
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The recommended instruction is actually "sll lr<whatever>,msp,0".
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We check for that, too. Originally Jim Kingdon's code seemed
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to be looking for a "sub" instruction here, but the mask was set
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up to lose all the time. */
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insn = read_memory_integer (p, 4);
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if (((insn & 0xff80ffff) == 0x15807d00) /* add */
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|| ((insn & 0xff80ffff) == 0x81807d00) ) /* sll */
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{
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p += 4;
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if (mfp_used != NULL)
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*mfp_used = 1;
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}
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/* Next comes a subtraction from msp to allocate a memory frame,
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but only if a memory frame is
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being used. We don't check msize against the trace-back tag.
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Normally this is just
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sub msp,msp,<msize>
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*/
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insn = read_memory_integer (p, 4);
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if ((insn & 0xffffff00) == 0x257d7d00)
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{
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p += 4;
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if (msize != NULL)
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*msize = insn & 0xff;
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}
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else
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{
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/* For large frames, instead of a single instruction it might
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be
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const <reg>, <msize>
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consth <reg>, <msize> ; optional
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sub msp,msp,<reg>
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*/
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int reg;
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unsigned msize0;
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CORE_ADDR q = p;
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if ((insn & 0xff000000) == 0x03000000)
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{
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reg = (insn >> 8) & 0xff;
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msize0 = ((insn >> 8) & 0xff00) | (insn & 0xff);
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q += 4;
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insn = read_memory_integer (q, 4);
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/* Check for consth. */
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if ((insn & 0xff000000) == 0x02000000
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&& (insn & 0x0000ff00) == reg)
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{
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msize0 |= (insn << 8) & 0xff000000;
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msize0 |= (insn << 16) & 0x00ff0000;
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q += 4;
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insn = read_memory_integer (q, 4);
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}
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/* Check for sub msp,msp,<reg>. */
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if ((insn & 0xffffff00) == 0x247d7d00
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&& (insn & 0xff) == reg)
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{
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p = q + 4;
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if (msize != NULL)
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*msize = msize0;
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}
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}
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}
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done:
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if (msymbol != NULL)
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{
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if (mi == 0)
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{
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/* Add a new cache entry. */
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mi = (struct prologue_info *)xmalloc (sizeof (struct prologue_info));
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msymbol -> misc_info = (char *)mi;
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mi->rsize_valid = 0;
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mi->msize_valid = 0;
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mi->mfp_valid = 0;
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}
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/* else, cache entry exists, but info is incomplete. */
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mi->pc = p;
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if (rsize != NULL)
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{
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mi->rsize = *rsize;
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mi->rsize_valid = 1;
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}
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if (msize != NULL)
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{
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mi->msize = *msize;
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mi->msize_valid = 1;
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}
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if (mfp_used != NULL)
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{
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mi->mfp_used = *mfp_used;
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mi->mfp_valid = 1;
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}
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}
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return p;
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}
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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CORE_ADDR
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skip_prologue (pc)
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CORE_ADDR pc;
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{
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return examine_prologue (pc, (unsigned *)NULL, (unsigned *)NULL,
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(int *)NULL);
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}
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/* Initialize the frame. In addition to setting "extra" frame info,
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we also set ->frame because we use it in a nonstandard way, and ->pc
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because we need to know it to get the other stuff. See the diagram
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of stacks and the frame cache in tm-29k.h for more detail. */
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static void
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init_frame_info (innermost_frame, fci)
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int innermost_frame;
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struct frame_info *fci;
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{
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CORE_ADDR p;
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long insn;
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unsigned rsize;
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unsigned msize;
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int mfp_used;
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struct symbol *func;
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p = fci->pc;
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if (innermost_frame)
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fci->frame = read_register (GR1_REGNUM);
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else
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fci->frame = fci->next_frame + fci->next->rsize;
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#if CALL_DUMMY_LOCATION == ON_STACK
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This wont work;
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#else
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if (PC_IN_CALL_DUMMY (p, 0, 0))
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#endif
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{
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fci->rsize = DUMMY_FRAME_RSIZE;
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/* This doesn't matter since we never try to get locals or args
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from a dummy frame. */
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fci->msize = 0;
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/* Dummy frames always use a memory frame pointer. */
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fci->saved_msp =
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read_register_stack_integer (fci->frame + DUMMY_FRAME_RSIZE - 4, 4);
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return;
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}
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func = find_pc_function (p);
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if (func != NULL)
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p = BLOCK_START (SYMBOL_BLOCK_VALUE (func));
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else
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{
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/* Search backward to find the trace-back tag. However,
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do not trace back beyond the start of the text segment
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(just as a sanity check to avoid going into never-never land). */
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while (p >= text_start
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&& ((insn = read_memory_integer (p, 4)) & 0xff000000) != 0)
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p -= 4;
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if (p < text_start)
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{
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/* Couldn't find the trace-back tag.
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Something strange is going on. */
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fci->saved_msp = 0;
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fci->rsize = 0;
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fci->msize = 0;
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return;
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}
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else
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/* Advance to the first word of the function, i.e. the word
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after the trace-back tag. */
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p += 4;
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}
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/* We've found the start of the function. Since High C interchanges
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the meanings of bits 23 and 22 (as of Jul 90), and we
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need to look at the prologue anyway to figure out
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what rsize is, ignore the contents of the trace-back tag. */
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examine_prologue (p, &rsize, &msize, &mfp_used);
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fci->rsize = rsize;
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fci->msize = msize;
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if (innermost_frame)
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{
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fci->saved_msp = read_register (MSP_REGNUM) + msize;
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}
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else
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{
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if (mfp_used)
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fci->saved_msp =
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read_register_stack_integer (fci->frame + rsize - 1, 4);
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else
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fci->saved_msp = fci->next->saved_msp + msize;
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}
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}
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void
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init_extra_frame_info (fci)
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struct frame_info *fci;
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{
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if (fci->next == 0)
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/* Assume innermost frame. May produce strange results for "info frame"
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but there isn't any way to tell the difference. */
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init_frame_info (1, fci);
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else {
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/* We're in get_prev_frame_info.
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Take care of everything in init_frame_pc. */
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;
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}
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}
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void
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init_frame_pc (fromleaf, fci)
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int fromleaf;
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struct frame_info *fci;
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{
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fci->pc = (fromleaf ? SAVED_PC_AFTER_CALL (fci->next) :
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fci->next ? FRAME_SAVED_PC (fci->next) : read_pc ());
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init_frame_info (0, fci);
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}
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/* Local variables (i.e. LOC_LOCAL) are on the memory stack, with their
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offsets being relative to the memory stack pointer (high C) or
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saved_msp (gcc). */
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CORE_ADDR
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frame_locals_address (fi)
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struct frame_info *fi;
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{
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struct block *b = block_for_pc (fi->pc);
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/* If compiled without -g, assume GCC. */
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if (b == NULL || BLOCK_GCC_COMPILED (b))
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return fi->saved_msp;
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else
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return fi->saved_msp - fi->msize;
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}
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/* Routines for reading the register stack. The caller gets to treat
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the register stack as a uniform stack in memory, from address $gr1
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straight through $rfb and beyond. */
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/* Analogous to read_memory except the length is understood to be 4.
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Also, myaddr can be NULL (meaning don't bother to read), and
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if actual_mem_addr is non-NULL, store there the address that it
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was fetched from (or if from a register the offset within
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registers). Set *LVAL to lval_memory or lval_register, depending
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on where it came from. */
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void
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read_register_stack (memaddr, myaddr, actual_mem_addr, lval)
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CORE_ADDR memaddr;
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char *myaddr;
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CORE_ADDR *actual_mem_addr;
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enum lval_type *lval;
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{
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long rfb = read_register (RFB_REGNUM);
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long rsp = read_register (RSP_REGNUM);
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if (memaddr < rfb)
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{
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/* It's in a register. */
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int regnum = (memaddr - rsp) / 4 + LR0_REGNUM;
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if (regnum < LR0_REGNUM || regnum > LR0_REGNUM + 127)
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error ("Attempt to read register stack out of range.");
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if (myaddr != NULL)
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read_register_gen (regnum, myaddr);
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if (lval != NULL)
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*lval = lval_register;
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if (actual_mem_addr != NULL)
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*actual_mem_addr = REGISTER_BYTE (regnum);
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}
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else
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{
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/* It's in the memory portion of the register stack. */
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if (myaddr != NULL)
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read_memory (memaddr, myaddr, 4);
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if (lval != NULL)
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*lval = lval_memory;
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if (actual_mem_addr != NULL)
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*actual_mem_addr = memaddr;
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}
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}
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/* Analogous to read_memory_integer
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except the length is understood to be 4. */
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long
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read_register_stack_integer (memaddr, len)
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CORE_ADDR memaddr;
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int len;
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{
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long buf;
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read_register_stack (memaddr, &buf, NULL, NULL);
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SWAP_TARGET_AND_HOST (&buf, 4);
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return buf;
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}
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/* Copy 4 bytes from GDB memory at MYADDR into inferior memory
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at MEMADDR and put the actual address written into in
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*ACTUAL_MEM_ADDR. */
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static void
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write_register_stack (memaddr, myaddr, actual_mem_addr)
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CORE_ADDR memaddr;
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char *myaddr;
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CORE_ADDR *actual_mem_addr;
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{
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long rfb = read_register (RFB_REGNUM);
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long rsp = read_register (RSP_REGNUM);
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if (memaddr < rfb)
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{
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/* It's in a register. */
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int regnum = (memaddr - rsp) / 4 + LR0_REGNUM;
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if (regnum < LR0_REGNUM || regnum > LR0_REGNUM + 127)
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error ("Attempt to read register stack out of range.");
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if (myaddr != NULL)
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write_register (regnum, *(long *)myaddr);
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if (actual_mem_addr != NULL)
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*actual_mem_addr = NULL;
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}
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else
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{
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/* It's in the memory portion of the register stack. */
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if (myaddr != NULL)
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write_memory (memaddr, myaddr, 4);
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if (actual_mem_addr != NULL)
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*actual_mem_addr = memaddr;
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}
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}
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/* Find register number REGNUM relative to FRAME and put its
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(raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable
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was optimized out (and thus can't be fetched). If the variable
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was fetched from memory, set *ADDRP to where it was fetched from,
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||
otherwise it was fetched from a register.
|
||
|
||
The argument RAW_BUFFER must point to aligned memory. */
|
||
void
|
||
get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lvalp)
|
||
char *raw_buffer;
|
||
int *optimized;
|
||
CORE_ADDR *addrp;
|
||
FRAME frame;
|
||
int regnum;
|
||
enum lval_type *lvalp;
|
||
{
|
||
struct frame_info *fi = get_frame_info (frame);
|
||
CORE_ADDR addr;
|
||
enum lval_type lval;
|
||
|
||
/* Once something has a register number, it doesn't get optimized out. */
|
||
if (optimized != NULL)
|
||
*optimized = 0;
|
||
if (regnum == RSP_REGNUM)
|
||
{
|
||
if (raw_buffer != NULL)
|
||
*(CORE_ADDR *)raw_buffer = fi->frame;
|
||
if (lvalp != NULL)
|
||
*lvalp = not_lval;
|
||
return;
|
||
}
|
||
else if (regnum == PC_REGNUM)
|
||
{
|
||
if (raw_buffer != NULL)
|
||
*(CORE_ADDR *)raw_buffer = fi->pc;
|
||
|
||
/* Not sure we have to do this. */
|
||
if (lvalp != NULL)
|
||
*lvalp = not_lval;
|
||
|
||
return;
|
||
}
|
||
else if (regnum == MSP_REGNUM)
|
||
{
|
||
if (raw_buffer != NULL)
|
||
{
|
||
if (fi->next != NULL)
|
||
*(CORE_ADDR *)raw_buffer = fi->next->saved_msp;
|
||
else
|
||
*(CORE_ADDR *)raw_buffer = read_register (MSP_REGNUM);
|
||
}
|
||
/* The value may have been computed, not fetched. */
|
||
if (lvalp != NULL)
|
||
*lvalp = not_lval;
|
||
return;
|
||
}
|
||
else if (regnum < LR0_REGNUM || regnum >= LR0_REGNUM + 128)
|
||
{
|
||
/* These registers are not saved over procedure calls,
|
||
so just print out the current values. */
|
||
if (raw_buffer != NULL)
|
||
*(CORE_ADDR *)raw_buffer = read_register (regnum);
|
||
if (lvalp != NULL)
|
||
*lvalp = lval_register;
|
||
if (addrp != NULL)
|
||
*addrp = REGISTER_BYTE (regnum);
|
||
return;
|
||
}
|
||
|
||
addr = fi->frame + (regnum - LR0_REGNUM) * 4;
|
||
if (raw_buffer != NULL)
|
||
read_register_stack (addr, raw_buffer, &addr, &lval);
|
||
if (lvalp != NULL)
|
||
*lvalp = lval;
|
||
if (addrp != NULL)
|
||
*addrp = addr;
|
||
}
|
||
|
||
/* Discard from the stack the innermost frame,
|
||
restoring all saved registers. */
|
||
|
||
void
|
||
pop_frame ()
|
||
{
|
||
FRAME frame = get_current_frame ();
|
||
struct frame_info *fi = get_frame_info (frame);
|
||
CORE_ADDR rfb = read_register (RFB_REGNUM);
|
||
CORE_ADDR gr1 = fi->frame + fi->rsize;
|
||
CORE_ADDR lr1;
|
||
CORE_ADDR ret_addr;
|
||
int i;
|
||
|
||
/* If popping a dummy frame, need to restore registers. */
|
||
if (PC_IN_CALL_DUMMY (read_register (PC_REGNUM),
|
||
read_register (SP_REGNUM),
|
||
FRAME_FP (fi)))
|
||
{
|
||
for (i = 0; i < DUMMY_SAVE_SR128; ++i)
|
||
write_register
|
||
(SR_REGNUM (i + 128),
|
||
read_register (LR0_REGNUM + DUMMY_ARG / 4 + i));
|
||
for (i = 0; i < DUMMY_SAVE_GREGS; ++i)
|
||
write_register
|
||
(RETURN_REGNUM + i,
|
||
read_register (LR0_REGNUM + DUMMY_ARG / 4 + DUMMY_SAVE_SR128 + i));
|
||
}
|
||
|
||
/* Restore the memory stack pointer. */
|
||
write_register (MSP_REGNUM, fi->saved_msp);
|
||
/* Restore the register stack pointer. */
|
||
write_register (GR1_REGNUM, gr1);
|
||
/* Check whether we need to fill registers. */
|
||
lr1 = read_register (LR0_REGNUM + 1);
|
||
if (lr1 > rfb)
|
||
{
|
||
/* Fill. */
|
||
int num_bytes = lr1 - rfb;
|
||
int i;
|
||
long word;
|
||
write_register (RAB_REGNUM, read_register (RAB_REGNUM) + num_bytes);
|
||
write_register (RFB_REGNUM, lr1);
|
||
for (i = 0; i < num_bytes; i += 4)
|
||
{
|
||
/* Note: word is in host byte order. */
|
||
word = read_memory_integer (rfb + i, 4);
|
||
write_register (LR0_REGNUM + ((rfb - gr1) % 0x80) + i / 4, word);
|
||
}
|
||
}
|
||
ret_addr = read_register (LR0_REGNUM);
|
||
write_register (PC_REGNUM, ret_addr);
|
||
write_register (NPC_REGNUM, ret_addr + 4);
|
||
flush_cached_frames ();
|
||
set_current_frame (create_new_frame (0, read_pc()));
|
||
}
|
||
|
||
/* Push an empty stack frame, to record the current PC, etc. */
|
||
|
||
void
|
||
push_dummy_frame ()
|
||
{
|
||
long w;
|
||
CORE_ADDR rab, gr1;
|
||
CORE_ADDR msp = read_register (MSP_REGNUM);
|
||
int i;
|
||
|
||
/* Save the PC. */
|
||
write_register (LR0_REGNUM, read_register (PC_REGNUM));
|
||
|
||
/* Allocate the new frame. */
|
||
gr1 = read_register (GR1_REGNUM) - DUMMY_FRAME_RSIZE;
|
||
write_register (GR1_REGNUM, gr1);
|
||
|
||
rab = read_register (RAB_REGNUM);
|
||
if (gr1 < rab)
|
||
{
|
||
/* We need to spill registers. */
|
||
int num_bytes = rab - gr1;
|
||
CORE_ADDR rfb = read_register (RFB_REGNUM);
|
||
int i;
|
||
long word;
|
||
|
||
write_register (RFB_REGNUM, rfb - num_bytes);
|
||
write_register (RAB_REGNUM, gr1);
|
||
for (i = 0; i < num_bytes; i += 4)
|
||
{
|
||
/* Note: word is in target byte order. */
|
||
read_register_gen (LR0_REGNUM + i / 4, &word, 4);
|
||
write_memory (rfb - num_bytes + i, &word, 4);
|
||
}
|
||
}
|
||
|
||
/* There are no arguments in to the dummy frame, so we don't need
|
||
more than rsize plus the return address and lr1. */
|
||
write_register (LR0_REGNUM + 1, gr1 + DUMMY_FRAME_RSIZE + 2 * 4);
|
||
|
||
/* Set the memory frame pointer. */
|
||
write_register (LR0_REGNUM + DUMMY_FRAME_RSIZE / 4 - 1, msp);
|
||
|
||
/* Allocate arg_slop. */
|
||
write_register (MSP_REGNUM, msp - 16 * 4);
|
||
|
||
/* Save registers. */
|
||
for (i = 0; i < DUMMY_SAVE_SR128; ++i)
|
||
write_register (LR0_REGNUM + DUMMY_ARG / 4 + i,
|
||
read_register (SR_REGNUM (i + 128)));
|
||
for (i = 0; i < DUMMY_SAVE_GREGS; ++i)
|
||
write_register (LR0_REGNUM + DUMMY_ARG / 4 + DUMMY_SAVE_SR128 + i,
|
||
read_register (RETURN_REGNUM + i));
|
||
}
|