-// OBSOLETE /* Target-machine dependent code for Motorola 88000 series, for GDB.
-// OBSOLETE
-// OBSOLETE Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
-// OBSOLETE 2000, 2001, 2002 Free Software Foundation, Inc.
-// OBSOLETE
-// OBSOLETE This file is part of GDB.
-// OBSOLETE
-// OBSOLETE This program is free software; you can redistribute it and/or modify
-// OBSOLETE it under the terms of the GNU General Public License as published by
-// OBSOLETE the Free Software Foundation; either version 2 of the License, or
-// OBSOLETE (at your option) any later version.
-// OBSOLETE
-// OBSOLETE This program is distributed in the hope that it will be useful,
-// OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of
-// OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// OBSOLETE GNU General Public License for more details.
-// OBSOLETE
-// OBSOLETE You should have received a copy of the GNU General Public License
-// OBSOLETE along with this program; if not, write to the Free Software
-// OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330,
-// OBSOLETE Boston, MA 02111-1307, USA. */
-// OBSOLETE
-// OBSOLETE #include "defs.h"
-// OBSOLETE #include "frame.h"
-// OBSOLETE #include "inferior.h"
-// OBSOLETE #include "value.h"
-// OBSOLETE #include "gdbcore.h"
-// OBSOLETE #include "symtab.h"
-// OBSOLETE #include "setjmp.h"
-// OBSOLETE #include "value.h"
-// OBSOLETE #include "regcache.h"
-// OBSOLETE
-// OBSOLETE /* Size of an instruction */
-// OBSOLETE #define BYTES_PER_88K_INSN 4
-// OBSOLETE
-// OBSOLETE void frame_find_saved_regs ();
-// OBSOLETE
-// OBSOLETE /* Is this target an m88110? Otherwise assume m88100. This has
-// OBSOLETE relevance for the ways in which we screw with instruction pointers. */
-// OBSOLETE
-// OBSOLETE int target_is_m88110 = 0;
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE m88k_target_write_pc (CORE_ADDR pc, ptid_t ptid)
-// OBSOLETE {
-// OBSOLETE /* According to the MC88100 RISC Microprocessor User's Manual,
-// OBSOLETE section 6.4.3.1.2:
-// OBSOLETE
-// OBSOLETE ... can be made to return to a particular instruction by placing
-// OBSOLETE a valid instruction address in the SNIP and the next sequential
-// OBSOLETE instruction address in the SFIP (with V bits set and E bits
-// OBSOLETE clear). The rte resumes execution at the instruction pointed to
-// OBSOLETE by the SNIP, then the SFIP.
-// OBSOLETE
-// OBSOLETE The E bit is the least significant bit (bit 0). The V (valid)
-// OBSOLETE bit is bit 1. This is why we logical or 2 into the values we are
-// OBSOLETE writing below. It turns out that SXIP plays no role when
-// OBSOLETE returning from an exception so nothing special has to be done
-// OBSOLETE with it. We could even (presumably) give it a totally bogus
-// OBSOLETE value.
-// OBSOLETE
-// OBSOLETE -- Kevin Buettner */
-// OBSOLETE
-// OBSOLETE write_register_pid (SXIP_REGNUM, pc, ptid);
-// OBSOLETE write_register_pid (SNIP_REGNUM, (pc | 2), ptid);
-// OBSOLETE write_register_pid (SFIP_REGNUM, (pc | 2) + 4, ptid);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* The type of a register. */
-// OBSOLETE struct type *
-// OBSOLETE m88k_register_type (int regnum)
-// OBSOLETE {
-// OBSOLETE if (regnum >= XFP_REGNUM)
-// OBSOLETE return builtin_type_m88110_ext;
-// OBSOLETE else if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM)
-// OBSOLETE return builtin_type_void_func_ptr;
-// OBSOLETE else
-// OBSOLETE return builtin_type_int32;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE
-// OBSOLETE /* The m88k kernel aligns all instructions on 4-byte boundaries. The
-// OBSOLETE kernel also uses the least significant two bits for its own hocus
-// OBSOLETE pocus. When gdb receives an address from the kernel, it needs to
-// OBSOLETE preserve those right-most two bits, but gdb also needs to be careful
-// OBSOLETE to realize that those two bits are not really a part of the address
-// OBSOLETE of an instruction. Shrug. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE m88k_addr_bits_remove (CORE_ADDR addr)
-// OBSOLETE {
-// OBSOLETE return ((addr) & ~3);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE
-// OBSOLETE /* Given a GDB frame, determine the address of the calling function's frame.
-// OBSOLETE This will be used to create a new GDB frame struct, and then
-// OBSOLETE INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
-// OBSOLETE
-// OBSOLETE For us, the frame address is its stack pointer value, so we look up
-// OBSOLETE the function prologue to determine the caller's sp value, and return it. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE frame_chain (struct frame_info *thisframe)
-// OBSOLETE {
-// OBSOLETE
-// OBSOLETE frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0);
-// OBSOLETE /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
-// OBSOLETE the ADDRESS, of SP_REGNUM. It also depends on the cache of
-// OBSOLETE frame_find_saved_regs results. */
-// OBSOLETE if (thisframe->fsr->regs[SP_REGNUM])
-// OBSOLETE return thisframe->fsr->regs[SP_REGNUM];
-// OBSOLETE else
-// OBSOLETE return thisframe->frame; /* Leaf fn -- next frame up has same SP. */
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE int
-// OBSOLETE frameless_function_invocation (struct frame_info *frame)
-// OBSOLETE {
-// OBSOLETE
-// OBSOLETE frame_find_saved_regs (frame, (struct frame_saved_regs *) 0);
-// OBSOLETE /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not
-// OBSOLETE the ADDRESS, of SP_REGNUM. It also depends on the cache of
-// OBSOLETE frame_find_saved_regs results. */
-// OBSOLETE if (frame->fsr->regs[SP_REGNUM])
-// OBSOLETE return 0; /* Frameful -- return addr saved somewhere */
-// OBSOLETE else
-// OBSOLETE return 1; /* Frameless -- no saved return address */
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE init_extra_frame_info (int fromleaf, struct frame_info *frame)
-// OBSOLETE {
-// OBSOLETE frame->fsr = 0; /* Not yet allocated */
-// OBSOLETE frame->args_pointer = 0; /* Unknown */
-// OBSOLETE frame->locals_pointer = 0; /* Unknown */
-// OBSOLETE }
-// OBSOLETE \f
-// OBSOLETE /* Examine an m88k function prologue, recording the addresses at which
-// OBSOLETE registers are saved explicitly by the prologue code, and returning
-// OBSOLETE the address of the first instruction after the prologue (but not
-// OBSOLETE after the instruction at address LIMIT, as explained below).
-// OBSOLETE
-// OBSOLETE LIMIT places an upper bound on addresses of the instructions to be
-// OBSOLETE examined. If the prologue code scan reaches LIMIT, the scan is
-// OBSOLETE aborted and LIMIT is returned. This is used, when examining the
-// OBSOLETE prologue for the current frame, to keep examine_prologue () from
-// OBSOLETE claiming that a given register has been saved when in fact the
-// OBSOLETE instruction that saves it has not yet been executed. LIMIT is used
-// OBSOLETE at other times to stop the scan when we hit code after the true
-// OBSOLETE function prologue (e.g. for the first source line) which might
-// OBSOLETE otherwise be mistaken for function prologue.
-// OBSOLETE
-// OBSOLETE The format of the function prologue matched by this routine is
-// OBSOLETE derived from examination of the source to gcc 1.95, particularly
-// OBSOLETE the routine output_prologue () in config/out-m88k.c.
-// OBSOLETE
-// OBSOLETE subu r31,r31,n # stack pointer update
-// OBSOLETE
-// OBSOLETE (st rn,r31,offset)? # save incoming regs
-// OBSOLETE (st.d rn,r31,offset)?
-// OBSOLETE
-// OBSOLETE (addu r30,r31,n)? # frame pointer update
-// OBSOLETE
-// OBSOLETE (pic sequence)? # PIC code prologue
-// OBSOLETE
-// OBSOLETE (or rn,rm,0)? # Move parameters to other regs
-// OBSOLETE */
-// OBSOLETE
-// OBSOLETE /* Macros for extracting fields from instructions. */
-// OBSOLETE
-// OBSOLETE #define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
-// OBSOLETE #define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
-// OBSOLETE #define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-// OBSOLETE #define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
-// OBSOLETE #define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
-// OBSOLETE #define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
-// OBSOLETE
-// OBSOLETE /*
-// OBSOLETE * prologue_insn_tbl is a table of instructions which may comprise a
-// OBSOLETE * function prologue. Associated with each table entry (corresponding
-// OBSOLETE * to a single instruction or group of instructions), is an action.
-// OBSOLETE * This action is used by examine_prologue (below) to determine
-// OBSOLETE * the state of certain machine registers and where the stack frame lives.
-// OBSOLETE */
-// OBSOLETE
-// OBSOLETE enum prologue_insn_action
-// OBSOLETE {
-// OBSOLETE PIA_SKIP, /* don't care what the instruction does */
-// OBSOLETE PIA_NOTE_ST, /* note register stored and where */
-// OBSOLETE PIA_NOTE_STD, /* note pair of registers stored and where */
-// OBSOLETE PIA_NOTE_SP_ADJUSTMENT, /* note stack pointer adjustment */
-// OBSOLETE PIA_NOTE_FP_ASSIGNMENT, /* note frame pointer assignment */
-// OBSOLETE PIA_NOTE_PROLOGUE_END, /* no more prologue */
-// OBSOLETE };
-// OBSOLETE
-// OBSOLETE struct prologue_insns
-// OBSOLETE {
-// OBSOLETE unsigned long insn;
-// OBSOLETE unsigned long mask;
-// OBSOLETE enum prologue_insn_action action;
-// OBSOLETE };
-// OBSOLETE
-// OBSOLETE struct prologue_insns prologue_insn_tbl[] =
-// OBSOLETE {
-// OBSOLETE /* Various register move instructions */
-// OBSOLETE {0x58000000, 0xf800ffff, PIA_SKIP}, /* or/or.u with immed of 0 */
-// OBSOLETE {0xf4005800, 0xfc1fffe0, PIA_SKIP}, /* or rd, r0, rs */
-// OBSOLETE {0xf4005800, 0xfc00ffff, PIA_SKIP}, /* or rd, rs, r0 */
-// OBSOLETE
-// OBSOLETE /* Stack pointer setup: "subu sp, sp, n" where n is a multiple of 8 */
-// OBSOLETE {0x67ff0000, 0xffff0007, PIA_NOTE_SP_ADJUSTMENT},
-// OBSOLETE
-// OBSOLETE /* Frame pointer assignment: "addu r30, r31, n" */
-// OBSOLETE {0x63df0000, 0xffff0000, PIA_NOTE_FP_ASSIGNMENT},
-// OBSOLETE
-// OBSOLETE /* Store to stack instructions; either "st rx, sp, n" or "st.d rx, sp, n" */
-// OBSOLETE {0x241f0000, 0xfc1f0000, PIA_NOTE_ST}, /* st rx, sp, n */
-// OBSOLETE {0x201f0000, 0xfc1f0000, PIA_NOTE_STD}, /* st.d rs, sp, n */
-// OBSOLETE
-// OBSOLETE /* Instructions needed for setting up r25 for pic code. */
-// OBSOLETE {0x5f200000, 0xffff0000, PIA_SKIP}, /* or.u r25, r0, offset_high */
-// OBSOLETE {0xcc000002, 0xffffffff, PIA_SKIP}, /* bsr.n Lab */
-// OBSOLETE {0x5b390000, 0xffff0000, PIA_SKIP}, /* or r25, r25, offset_low */
-// OBSOLETE {0xf7396001, 0xffffffff, PIA_SKIP}, /* Lab: addu r25, r25, r1 */
-// OBSOLETE
-// OBSOLETE /* Various branch or jump instructions which have a delay slot -- these
-// OBSOLETE do not form part of the prologue, but the instruction in the delay
-// OBSOLETE slot might be a store instruction which should be noted. */
-// OBSOLETE {0xc4000000, 0xe4000000, PIA_NOTE_PROLOGUE_END},
-// OBSOLETE /* br.n, bsr.n, bb0.n, or bb1.n */
-// OBSOLETE {0xec000000, 0xfc000000, PIA_NOTE_PROLOGUE_END}, /* bcnd.n */
-// OBSOLETE {0xf400c400, 0xfffff7e0, PIA_NOTE_PROLOGUE_END} /* jmp.n or jsr.n */
-// OBSOLETE
-// OBSOLETE };
-// OBSOLETE
-// OBSOLETE
-// OBSOLETE /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
-// OBSOLETE is not the address of a valid instruction, the address of the next
-// OBSOLETE instruction beyond ADDR otherwise. *PWORD1 receives the first word
-// OBSOLETE of the instruction. */
-// OBSOLETE
-// OBSOLETE #define NEXT_PROLOGUE_INSN(addr, lim, pword1) \
-// OBSOLETE (((addr) < (lim)) ? next_insn (addr, pword1) : 0)
-// OBSOLETE
-// OBSOLETE /* Read the m88k instruction at 'memaddr' and return the address of
-// OBSOLETE the next instruction after that, or 0 if 'memaddr' is not the
-// OBSOLETE address of a valid instruction. The instruction
-// OBSOLETE is stored at 'pword1'. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE next_insn (CORE_ADDR memaddr, unsigned long *pword1)
-// OBSOLETE {
-// OBSOLETE *pword1 = read_memory_integer (memaddr, BYTES_PER_88K_INSN);
-// OBSOLETE return memaddr + BYTES_PER_88K_INSN;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Read a register from frames called by us (or from the hardware regs). */
-// OBSOLETE
-// OBSOLETE static int
-// OBSOLETE read_next_frame_reg (struct frame_info *frame, int regno)
-// OBSOLETE {
-// OBSOLETE for (; frame; frame = frame->next)
-// OBSOLETE {
-// OBSOLETE if (regno == SP_REGNUM)
-// OBSOLETE return FRAME_FP (frame);
-// OBSOLETE else if (frame->fsr->regs[regno])
-// OBSOLETE return read_memory_integer (frame->fsr->regs[regno], 4);
-// OBSOLETE }
-// OBSOLETE return read_register (regno);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Examine the prologue of a function. `ip' points to the first instruction.
-// OBSOLETE `limit' is the limit of the prologue (e.g. the addr of the first
-// OBSOLETE linenumber, or perhaps the program counter if we're stepping through).
-// OBSOLETE `frame_sp' is the stack pointer value in use in this frame.
-// OBSOLETE `fsr' is a pointer to a frame_saved_regs structure into which we put
-// OBSOLETE info about the registers saved by this frame.
-// OBSOLETE `fi' is a struct frame_info pointer; we fill in various fields in it
-// OBSOLETE to reflect the offsets of the arg pointer and the locals pointer. */
-// OBSOLETE
-// OBSOLETE static CORE_ADDR
-// OBSOLETE examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit,
-// OBSOLETE CORE_ADDR frame_sp, struct frame_saved_regs *fsr,
-// OBSOLETE struct frame_info *fi)
-// OBSOLETE {
-// OBSOLETE register CORE_ADDR next_ip;
-// OBSOLETE register int src;
-// OBSOLETE unsigned long insn;
-// OBSOLETE int size, offset;
-// OBSOLETE char must_adjust[32]; /* If set, must adjust offsets in fsr */
-// OBSOLETE int sp_offset = -1; /* -1 means not set (valid must be mult of 8) */
-// OBSOLETE int fp_offset = -1; /* -1 means not set */
-// OBSOLETE CORE_ADDR frame_fp;
-// OBSOLETE CORE_ADDR prologue_end = 0;
-// OBSOLETE
-// OBSOLETE memset (must_adjust, '\0', sizeof (must_adjust));
-// OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
-// OBSOLETE
-// OBSOLETE while (next_ip)
-// OBSOLETE {
-// OBSOLETE struct prologue_insns *pip;
-// OBSOLETE
-// OBSOLETE for (pip = prologue_insn_tbl; (insn & pip->mask) != pip->insn;)
-// OBSOLETE if (++pip >= prologue_insn_tbl + sizeof prologue_insn_tbl)
-// OBSOLETE goto end_of_prologue_found; /* not a prologue insn */
-// OBSOLETE
-// OBSOLETE switch (pip->action)
-// OBSOLETE {
-// OBSOLETE case PIA_NOTE_ST:
-// OBSOLETE case PIA_NOTE_STD:
-// OBSOLETE if (sp_offset != -1)
-// OBSOLETE {
-// OBSOLETE src = ST_SRC (insn);
-// OBSOLETE offset = ST_OFFSET (insn);
-// OBSOLETE must_adjust[src] = 1;
-// OBSOLETE fsr->regs[src++] = offset; /* Will be adjusted later */
-// OBSOLETE if (pip->action == PIA_NOTE_STD && src < 32)
-// OBSOLETE {
-// OBSOLETE offset += 4;
-// OBSOLETE must_adjust[src] = 1;
-// OBSOLETE fsr->regs[src++] = offset;
-// OBSOLETE }
-// OBSOLETE }
-// OBSOLETE else
-// OBSOLETE goto end_of_prologue_found;
-// OBSOLETE break;
-// OBSOLETE case PIA_NOTE_SP_ADJUSTMENT:
-// OBSOLETE if (sp_offset == -1)
-// OBSOLETE sp_offset = -SUBU_OFFSET (insn);
-// OBSOLETE else
-// OBSOLETE goto end_of_prologue_found;
-// OBSOLETE break;
-// OBSOLETE case PIA_NOTE_FP_ASSIGNMENT:
-// OBSOLETE if (fp_offset == -1)
-// OBSOLETE fp_offset = ADDU_OFFSET (insn);
-// OBSOLETE else
-// OBSOLETE goto end_of_prologue_found;
-// OBSOLETE break;
-// OBSOLETE case PIA_NOTE_PROLOGUE_END:
-// OBSOLETE if (!prologue_end)
-// OBSOLETE prologue_end = ip;
-// OBSOLETE break;
-// OBSOLETE case PIA_SKIP:
-// OBSOLETE default:
-// OBSOLETE /* Do nothing */
-// OBSOLETE break;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE ip = next_ip;
-// OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE end_of_prologue_found:
-// OBSOLETE
-// OBSOLETE if (prologue_end)
-// OBSOLETE ip = prologue_end;
-// OBSOLETE
-// OBSOLETE /* We're done with the prologue. If we don't care about the stack
-// OBSOLETE frame itself, just return. (Note that fsr->regs has been trashed,
-// OBSOLETE but the one caller who calls with fi==0 passes a dummy there.) */
-// OBSOLETE
-// OBSOLETE if (fi == 0)
-// OBSOLETE return ip;
-// OBSOLETE
-// OBSOLETE /*
-// OBSOLETE OK, now we have:
-// OBSOLETE
-// OBSOLETE sp_offset original (before any alloca calls) displacement of SP
-// OBSOLETE (will be negative).
-// OBSOLETE
-// OBSOLETE fp_offset displacement from original SP to the FP for this frame
-// OBSOLETE or -1.
-// OBSOLETE
-// OBSOLETE fsr->regs[0..31] displacement from original SP to the stack
-// OBSOLETE location where reg[0..31] is stored.
-// OBSOLETE
-// OBSOLETE must_adjust[0..31] set if corresponding offset was set.
-// OBSOLETE
-// OBSOLETE If alloca has been called between the function prologue and the current
-// OBSOLETE IP, then the current SP (frame_sp) will not be the original SP as set by
-// OBSOLETE the function prologue. If the current SP is not the original SP, then the
-// OBSOLETE compiler will have allocated an FP for this frame, fp_offset will be set,
-// OBSOLETE and we can use it to calculate the original SP.
-// OBSOLETE
-// OBSOLETE Then, we figure out where the arguments and locals are, and relocate the
-// OBSOLETE offsets in fsr->regs to absolute addresses. */
-// OBSOLETE
-// OBSOLETE if (fp_offset != -1)
-// OBSOLETE {
-// OBSOLETE /* We have a frame pointer, so get it, and base our calc's on it. */
-// OBSOLETE frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, ACTUAL_FP_REGNUM);
-// OBSOLETE frame_sp = frame_fp - fp_offset;
-// OBSOLETE }
-// OBSOLETE else
-// OBSOLETE {
-// OBSOLETE /* We have no frame pointer, therefore frame_sp is still the same value
-// OBSOLETE as set by prologue. But where is the frame itself? */
-// OBSOLETE if (must_adjust[SRP_REGNUM])
-// OBSOLETE {
-// OBSOLETE /* Function header saved SRP (r1), the return address. Frame starts
-// OBSOLETE 4 bytes down from where it was saved. */
-// OBSOLETE frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4;
-// OBSOLETE fi->locals_pointer = frame_fp;
-// OBSOLETE }
-// OBSOLETE else
-// OBSOLETE {
-// OBSOLETE /* Function header didn't save SRP (r1), so we are in a leaf fn or
-// OBSOLETE are otherwise confused. */
-// OBSOLETE frame_fp = -1;
-// OBSOLETE }
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* The locals are relative to the FP (whether it exists as an allocated
-// OBSOLETE register, or just as an assumed offset from the SP) */
-// OBSOLETE fi->locals_pointer = frame_fp;
-// OBSOLETE
-// OBSOLETE /* The arguments are just above the SP as it was before we adjusted it
-// OBSOLETE on entry. */
-// OBSOLETE fi->args_pointer = frame_sp - sp_offset;
-// OBSOLETE
-// OBSOLETE /* Now that we know the SP value used by the prologue, we know where
-// OBSOLETE it saved all the registers. */
-// OBSOLETE for (src = 0; src < 32; src++)
-// OBSOLETE if (must_adjust[src])
-// OBSOLETE fsr->regs[src] += frame_sp;
-// OBSOLETE
-// OBSOLETE /* The saved value of the SP is always known. */
-// OBSOLETE /* (we hope...) */
-// OBSOLETE if (fsr->regs[SP_REGNUM] != 0
-// OBSOLETE && fsr->regs[SP_REGNUM] != frame_sp - sp_offset)
-// OBSOLETE fprintf_unfiltered (gdb_stderr, "Bad saved SP value %lx != %lx, offset %x!\n",
-// OBSOLETE fsr->regs[SP_REGNUM],
-// OBSOLETE frame_sp - sp_offset, sp_offset);
-// OBSOLETE
-// OBSOLETE fsr->regs[SP_REGNUM] = frame_sp - sp_offset;
-// OBSOLETE
-// OBSOLETE return (ip);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Given an ip value corresponding to the start of a function,
-// OBSOLETE return the ip of the first instruction after the function
-// OBSOLETE prologue. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE m88k_skip_prologue (CORE_ADDR ip)
-// OBSOLETE {
-// OBSOLETE struct frame_saved_regs saved_regs_dummy;
-// OBSOLETE struct symtab_and_line sal;
-// OBSOLETE CORE_ADDR limit;
-// OBSOLETE
-// OBSOLETE sal = find_pc_line (ip, 0);
-// OBSOLETE limit = (sal.end) ? sal.end : 0xffffffff;
-// OBSOLETE
-// OBSOLETE return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy,
-// OBSOLETE (struct frame_info *) 0));
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Put here the code to store, into a struct frame_saved_regs,
-// OBSOLETE the addresses of the saved registers of frame described by FRAME_INFO.
-// OBSOLETE This includes special registers such as pc and fp saved in special
-// OBSOLETE ways in the stack frame. sp is even more special:
-// OBSOLETE the address we return for it IS the sp for the next frame.
-// OBSOLETE
-// OBSOLETE We cache the result of doing this in the frame_obstack, since it is
-// OBSOLETE fairly expensive. */
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE frame_find_saved_regs (struct frame_info *fi, struct frame_saved_regs *fsr)
-// OBSOLETE {
-// OBSOLETE register struct frame_saved_regs *cache_fsr;
-// OBSOLETE CORE_ADDR ip;
-// OBSOLETE struct symtab_and_line sal;
-// OBSOLETE CORE_ADDR limit;
-// OBSOLETE
-// OBSOLETE if (!fi->fsr)
-// OBSOLETE {
-// OBSOLETE cache_fsr = (struct frame_saved_regs *)
-// OBSOLETE frame_obstack_alloc (sizeof (struct frame_saved_regs));
-// OBSOLETE memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
-// OBSOLETE fi->fsr = cache_fsr;
-// OBSOLETE
-// OBSOLETE /* Find the start and end of the function prologue. If the PC
-// OBSOLETE is in the function prologue, we only consider the part that
-// OBSOLETE has executed already. In the case where the PC is not in
-// OBSOLETE the function prologue, we set limit to two instructions beyond
-// OBSOLETE where the prologue ends in case if any of the prologue instructions
-// OBSOLETE were moved into a delay slot of a branch instruction. */
-// OBSOLETE
-// OBSOLETE ip = get_pc_function_start (fi->pc);
-// OBSOLETE sal = find_pc_line (ip, 0);
-// OBSOLETE limit = (sal.end && sal.end < fi->pc) ? sal.end + 2 * BYTES_PER_88K_INSN
-// OBSOLETE : fi->pc;
-// OBSOLETE
-// OBSOLETE /* This will fill in fields in *fi as well as in cache_fsr. */
-// OBSOLETE #ifdef SIGTRAMP_FRAME_FIXUP
-// OBSOLETE if (fi->signal_handler_caller)
-// OBSOLETE SIGTRAMP_FRAME_FIXUP (fi->frame);
-// OBSOLETE #endif
-// OBSOLETE examine_prologue (ip, limit, fi->frame, cache_fsr, fi);
-// OBSOLETE #ifdef SIGTRAMP_SP_FIXUP
-// OBSOLETE if (fi->signal_handler_caller && fi->fsr->regs[SP_REGNUM])
-// OBSOLETE SIGTRAMP_SP_FIXUP (fi->fsr->regs[SP_REGNUM]);
-// OBSOLETE #endif
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE if (fsr)
-// OBSOLETE *fsr = *fi->fsr;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Return the address of the locals block for the frame
-// OBSOLETE described by FI. Returns 0 if the address is unknown.
-// OBSOLETE NOTE! Frame locals are referred to by negative offsets from the
-// OBSOLETE argument pointer, so this is the same as frame_args_address(). */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE frame_locals_address (struct frame_info *fi)
-// OBSOLETE {
-// OBSOLETE struct frame_saved_regs fsr;
-// OBSOLETE
-// OBSOLETE if (fi->args_pointer) /* Cached value is likely there. */
-// OBSOLETE return fi->args_pointer;
-// OBSOLETE
-// OBSOLETE /* Nope, generate it. */
-// OBSOLETE
-// OBSOLETE get_frame_saved_regs (fi, &fsr);
-// OBSOLETE
-// OBSOLETE return fi->args_pointer;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Return the address of the argument block for the frame
-// OBSOLETE described by FI. Returns 0 if the address is unknown. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE frame_args_address (struct frame_info *fi)
-// OBSOLETE {
-// OBSOLETE struct frame_saved_regs fsr;
-// OBSOLETE
-// OBSOLETE if (fi->args_pointer) /* Cached value is likely there. */
-// OBSOLETE return fi->args_pointer;
-// OBSOLETE
-// OBSOLETE /* Nope, generate it. */
-// OBSOLETE
-// OBSOLETE get_frame_saved_regs (fi, &fsr);
-// OBSOLETE
-// OBSOLETE return fi->args_pointer;
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE /* Return the saved PC from this frame.
-// OBSOLETE
-// OBSOLETE If the frame has a memory copy of SRP_REGNUM, use that. If not,
-// OBSOLETE just use the register SRP_REGNUM itself. */
-// OBSOLETE
-// OBSOLETE CORE_ADDR
-// OBSOLETE frame_saved_pc (struct frame_info *frame)
-// OBSOLETE {
-// OBSOLETE return read_next_frame_reg (frame, SRP_REGNUM);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE
-// OBSOLETE #define DUMMY_FRAME_SIZE 192
-// OBSOLETE
-// OBSOLETE static void
-// OBSOLETE write_word (CORE_ADDR sp, ULONGEST word)
-// OBSOLETE {
-// OBSOLETE register int len = REGISTER_SIZE;
-// OBSOLETE char buffer[MAX_REGISTER_RAW_SIZE];
-// OBSOLETE
-// OBSOLETE store_unsigned_integer (buffer, len, word);
-// OBSOLETE write_memory (sp, buffer, len);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE m88k_push_dummy_frame (void)
-// OBSOLETE {
-// OBSOLETE register CORE_ADDR sp = read_register (SP_REGNUM);
-// OBSOLETE register int rn;
-// OBSOLETE int offset;
-// OBSOLETE
-// OBSOLETE sp -= DUMMY_FRAME_SIZE; /* allocate a bunch of space */
-// OBSOLETE
-// OBSOLETE for (rn = 0, offset = 0; rn <= SP_REGNUM; rn++, offset += 4)
-// OBSOLETE write_word (sp + offset, read_register (rn));
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (SXIP_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (SNIP_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (SFIP_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (PSR_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (FPSR_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_word (sp + offset, read_register (FPCR_REGNUM));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (SP_REGNUM, sp);
-// OBSOLETE write_register (ACTUAL_FP_REGNUM, sp);
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE pop_frame (void)
-// OBSOLETE {
-// OBSOLETE register struct frame_info *frame = get_current_frame ();
-// OBSOLETE register int regnum;
-// OBSOLETE struct frame_saved_regs fsr;
-// OBSOLETE
-// OBSOLETE get_frame_saved_regs (frame, &fsr);
-// OBSOLETE
-// OBSOLETE if (PC_IN_CALL_DUMMY (read_pc (), read_register (SP_REGNUM), frame->frame))
-// OBSOLETE {
-// OBSOLETE /* FIXME: I think get_frame_saved_regs should be handling this so
-// OBSOLETE that we can deal with the saved registers properly (e.g. frame
-// OBSOLETE 1 is a call dummy, the user types "frame 2" and then "print $ps"). */
-// OBSOLETE register CORE_ADDR sp = read_register (ACTUAL_FP_REGNUM);
-// OBSOLETE int offset;
-// OBSOLETE
-// OBSOLETE for (regnum = 0, offset = 0; regnum <= SP_REGNUM; regnum++, offset += 4)
-// OBSOLETE (void) write_register (regnum, read_memory_integer (sp + offset, 4));
-// OBSOLETE
-// OBSOLETE write_register (SXIP_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (SNIP_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (SFIP_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (PSR_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (FPSR_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE write_register (FPCR_REGNUM, read_memory_integer (sp + offset, 4));
-// OBSOLETE offset += 4;
-// OBSOLETE
-// OBSOLETE }
-// OBSOLETE else
-// OBSOLETE {
-// OBSOLETE for (regnum = FP_REGNUM; regnum > 0; regnum--)
-// OBSOLETE if (fsr.regs[regnum])
-// OBSOLETE write_register (regnum,
-// OBSOLETE read_memory_integer (fsr.regs[regnum], 4));
-// OBSOLETE write_pc (frame_saved_pc (frame));
-// OBSOLETE }
-// OBSOLETE reinit_frame_cache ();
-// OBSOLETE }
-// OBSOLETE
-// OBSOLETE void
-// OBSOLETE _initialize_m88k_tdep (void)
-// OBSOLETE {
-// OBSOLETE tm_print_insn = print_insn_m88k;
-// OBSOLETE }
+/* Target-dependent code for the Motorola 88000 series.
+
+ Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
+#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "gdbcore.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "regset.h"
+#include "symtab.h"
+#include "trad-frame.h"
+#include "value.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "m88k-tdep.h"
+
+/* Fetch the instruction at PC. */
+
+static unsigned long
+m88k_fetch_instruction (CORE_ADDR pc)
+{
+ return read_memory_unsigned_integer (pc, 4);
+}
+
+/* Register information. */
+
+/* Return the name of register REGNUM. */
+
+static const char *
+m88k_register_name (struct gdbarch *gdbarch, int regnum)
+{
+ static char *register_names[] =
+ {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+ "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
+ "epsr", "fpsr", "fpcr", "sxip", "snip", "sfip"
+ };
+
+ if (regnum >= 0 && regnum < ARRAY_SIZE (register_names))
+ return register_names[regnum];
+
+ return NULL;
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
+
+static struct type *
+m88k_register_type (struct gdbarch *gdbarch, int regnum)
+{
+ /* SXIP, SNIP, SFIP and R1 contain code addresses. */
+ if ((regnum >= M88K_SXIP_REGNUM && regnum <= M88K_SFIP_REGNUM)
+ || regnum == M88K_R1_REGNUM)
+ return builtin_type_void_func_ptr;
+
+ /* R30 and R31 typically contains data addresses. */
+ if (regnum == M88K_R30_REGNUM || regnum == M88K_R31_REGNUM)
+ return builtin_type_void_data_ptr;
+
+ return builtin_type_int32;
+}
+\f
+
+static CORE_ADDR
+m88k_addr_bits_remove (CORE_ADDR addr)
+{
+ /* All instructures are 4-byte aligned. The lower 2 bits of SXIP,
+ SNIP and SFIP are used for special purposes: bit 0 is the
+ exception bit and bit 1 is the valid bit. */
+ return addr & ~0x3;
+}
+
+/* Use the program counter to determine the contents and size of a
+ breakpoint instruction. Return a pointer to a string of bytes that
+ encode a breakpoint instruction, store the length of the string in
+ *LEN and optionally adjust *PC to point to the correct memory
+ location for inserting the breakpoint. */
+
+static const gdb_byte *
+m88k_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, int *len)
+{
+ /* tb 0,r0,511 */
+ static gdb_byte break_insn[] = { 0xf0, 0x00, 0xd1, 0xff };
+
+ *len = sizeof (break_insn);
+ return break_insn;
+}
+
+static CORE_ADDR
+m88k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ CORE_ADDR pc;
+
+ pc = frame_unwind_register_unsigned (next_frame, M88K_SXIP_REGNUM);
+ return m88k_addr_bits_remove (pc);
+}
+
+static void
+m88k_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ /* According to the MC88100 RISC Microprocessor User's Manual,
+ section 6.4.3.1.2:
+
+ "... can be made to return to a particular instruction by placing
+ a valid instruction address in the SNIP and the next sequential
+ instruction address in the SFIP (with V bits set and E bits
+ clear). The rte resumes execution at the instruction pointed to
+ by the SNIP, then the SFIP."
+
+ The E bit is the least significant bit (bit 0). The V (valid)
+ bit is bit 1. This is why we logical or 2 into the values we are
+ writing below. It turns out that SXIP plays no role when
+ returning from an exception so nothing special has to be done
+ with it. We could even (presumably) give it a totally bogus
+ value. */
+
+ regcache_cooked_write_unsigned (regcache, M88K_SXIP_REGNUM, pc);
+ regcache_cooked_write_unsigned (regcache, M88K_SNIP_REGNUM, pc | 2);
+ regcache_cooked_write_unsigned (regcache, M88K_SFIP_REGNUM, (pc + 4) | 2);
+}
+\f
+
+/* The functions on this page are intended to be used to classify
+ function arguments. */
+
+/* Check whether TYPE is "Integral or Pointer". */
+
+static int
+m88k_integral_or_pointer_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_RANGE:
+ {
+ /* We have byte, half-word, word and extended-word/doubleword
+ integral types. */
+ int len = TYPE_LENGTH (type);
+ return (len == 1 || len == 2 || len == 4 || len == 8);
+ }
+ return 1;
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ {
+ /* Allow only 32-bit pointers. */
+ return (TYPE_LENGTH (type) == 4);
+ }
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/* Check whether TYPE is "Floating". */
+
+static int
+m88k_floating_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_FLT:
+ {
+ int len = TYPE_LENGTH (type);
+ return (len == 4 || len == 8);
+ }
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/* Check whether TYPE is "Structure or Union". */
+
+static int
+m88k_structure_or_union_p (const struct type *type)
+{
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+/* Check whether TYPE has 8-byte alignment. */
+
+static int
+m88k_8_byte_align_p (struct type *type)
+{
+ if (m88k_structure_or_union_p (type))
+ {
+ int i;
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ struct type *subtype = check_typedef (TYPE_FIELD_TYPE (type, i));
+
+ if (m88k_8_byte_align_p (subtype))
+ return 1;
+ }
+ }
+
+ if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
+ return (TYPE_LENGTH (type) == 8);
+
+ return 0;
+}
+
+/* Check whether TYPE can be passed in a register. */
+
+static int
+m88k_in_register_p (struct type *type)
+{
+ if (m88k_integral_or_pointer_p (type) || m88k_floating_p (type))
+ return 1;
+
+ if (m88k_structure_or_union_p (type) && TYPE_LENGTH (type) == 4)
+ return 1;
+
+ return 0;
+}
+
+static CORE_ADDR
+m88k_store_arguments (struct regcache *regcache, int nargs,
+ struct value **args, CORE_ADDR sp)
+{
+ int num_register_words = 0;
+ int num_stack_words = 0;
+ int i;
+
+ for (i = 0; i < nargs; i++)
+ {
+ struct type *type = value_type (args[i]);
+ int len = TYPE_LENGTH (type);
+
+ if (m88k_integral_or_pointer_p (type) && len < 4)
+ {
+ args[i] = value_cast (builtin_type_int32, args[i]);
+ type = value_type (args[i]);
+ len = TYPE_LENGTH (type);
+ }
+
+ if (m88k_in_register_p (type))
+ {
+ int num_words = 0;
+
+ if (num_register_words % 2 == 1 && m88k_8_byte_align_p (type))
+ num_words++;
+
+ num_words += ((len + 3) / 4);
+ if (num_register_words + num_words <= 8)
+ {
+ num_register_words += num_words;
+ continue;
+ }
+
+ /* We've run out of available registers. Pass the argument
+ on the stack. */
+ }
+
+ if (num_stack_words % 2 == 1 && m88k_8_byte_align_p (type))
+ num_stack_words++;
+
+ num_stack_words += ((len + 3) / 4);
+ }
+
+ /* Allocate stack space. */
+ sp = align_down (sp - 32 - num_stack_words * 4, 16);
+ num_stack_words = num_register_words = 0;
+
+ for (i = 0; i < nargs; i++)
+ {
+ const bfd_byte *valbuf = value_contents (args[i]);
+ struct type *type = value_type (args[i]);
+ int len = TYPE_LENGTH (type);
+ int stack_word = num_stack_words;
+
+ if (m88k_in_register_p (type))
+ {
+ int register_word = num_register_words;
+
+ if (register_word % 2 == 1 && m88k_8_byte_align_p (type))
+ register_word++;
+
+ gdb_assert (len == 4 || len == 8);
+
+ if (register_word + len / 8 < 8)
+ {
+ int regnum = M88K_R2_REGNUM + register_word;
+
+ regcache_raw_write (regcache, regnum, valbuf);
+ if (len > 4)
+ regcache_raw_write (regcache, regnum + 1, valbuf + 4);
+
+ num_register_words = (register_word + len / 4);
+ continue;
+ }
+ }
+
+ if (stack_word % 2 == -1 && m88k_8_byte_align_p (type))
+ stack_word++;
+
+ write_memory (sp + stack_word * 4, valbuf, len);
+ num_stack_words = (stack_word + (len + 3) / 4);
+ }
+
+ return sp;
+}
+
+static CORE_ADDR
+m88k_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr, int nargs,
+ struct value **args, CORE_ADDR sp, int struct_return,
+ CORE_ADDR struct_addr)
+{
+ /* Set up the function arguments. */
+ sp = m88k_store_arguments (regcache, nargs, args, sp);
+ gdb_assert (sp % 16 == 0);
+
+ /* Store return value address. */
+ if (struct_return)
+ regcache_raw_write_unsigned (regcache, M88K_R12_REGNUM, struct_addr);
+
+ /* Store the stack pointer and return address in the appropriate
+ registers. */
+ regcache_raw_write_unsigned (regcache, M88K_R31_REGNUM, sp);
+ regcache_raw_write_unsigned (regcache, M88K_R1_REGNUM, bp_addr);
+
+ /* Return the stack pointer. */
+ return sp;
+}
+
+static struct frame_id
+m88k_unwind_dummy_id (struct gdbarch *arch, struct frame_info *next_frame)
+{
+ CORE_ADDR sp;
+
+ sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
+ return frame_id_build (sp, frame_pc_unwind (next_frame));
+}
+\f
+
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+m88k_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, gdb_byte *readbuf,
+ const gdb_byte *writebuf)
+{
+ int len = TYPE_LENGTH (type);
+ gdb_byte buf[8];
+
+ if (!m88k_integral_or_pointer_p (type) && !m88k_floating_p (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ {
+ /* Read the contents of R2 and (if necessary) R3. */
+ regcache_cooked_read (regcache, M88K_R2_REGNUM, buf);
+ if (len > 4)
+ {
+ regcache_cooked_read (regcache, M88K_R3_REGNUM, buf + 4);
+ gdb_assert (len == 8);
+ memcpy (readbuf, buf, len);
+ }
+ else
+ {
+ /* Just stripping off any unused bytes should preserve the
+ signed-ness just fine. */
+ memcpy (readbuf, buf + 4 - len, len);
+ }
+ }
+
+ if (writebuf)
+ {
+ /* Read the contents to R2 and (if necessary) R3. */
+ if (len > 4)
+ {
+ gdb_assert (len == 8);
+ memcpy (buf, writebuf, 8);
+ regcache_cooked_write (regcache, M88K_R3_REGNUM, buf + 4);
+ }
+ else
+ {
+ /* ??? Do we need to do any sign-extension here? */
+ memcpy (buf + 4 - len, writebuf, len);
+ }
+ regcache_cooked_write (regcache, M88K_R2_REGNUM, buf);
+ }
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
+\f
+/* Default frame unwinder. */
+
+struct m88k_frame_cache
+{
+ /* Base address. */
+ CORE_ADDR base;
+ CORE_ADDR pc;
+
+ int sp_offset;
+ int fp_offset;
+
+ /* Table of saved registers. */
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+/* Prologue analysis. */
+
+/* Macros for extracting fields from instructions. */
+
+#define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
+#define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
+#define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+#define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF))
+#define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5)
+#define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF))
+
+/* Possible actions to be taken by the prologue analyzer for the
+ instructions it encounters. */
+
+enum m88k_prologue_insn_action
+{
+ M88K_PIA_SKIP, /* Ignore. */
+ M88K_PIA_NOTE_ST, /* Note register store. */
+ M88K_PIA_NOTE_STD, /* Note register pair store. */
+ M88K_PIA_NOTE_SP_ADJUSTMENT, /* Note stack pointer adjustment. */
+ M88K_PIA_NOTE_FP_ASSIGNMENT, /* Note frame pointer assignment. */
+ M88K_PIA_NOTE_BRANCH, /* Note branch. */
+ M88K_PIA_NOTE_PROLOGUE_END /* Note end of prologue. */
+};
+
+/* Table of instructions that may comprise a function prologue. */
+
+struct m88k_prologue_insn
+{
+ unsigned long insn;
+ unsigned long mask;
+ enum m88k_prologue_insn_action action;
+};
+
+struct m88k_prologue_insn m88k_prologue_insn_table[] =
+{
+ /* Various register move instructions. */
+ { 0x58000000, 0xf800ffff, M88K_PIA_SKIP }, /* or/or.u with immed of 0 */
+ { 0xf4005800, 0xfc1fffe0, M88K_PIA_SKIP }, /* or rd,r0,rs */
+ { 0xf4005800, 0xfc00ffff, M88K_PIA_SKIP }, /* or rd,rs,r0 */
+
+ /* Various other instructions. */
+ { 0x58000000, 0xf8000000, M88K_PIA_SKIP }, /* or/or.u */
+
+ /* Stack pointer setup: "subu sp,sp,n" where n is a multiple of 8. */
+ { 0x67ff0000, 0xffff0007, M88K_PIA_NOTE_SP_ADJUSTMENT },
+
+ /* Frame pointer assignment: "addu r30,r31,n". */
+ { 0x63df0000, 0xffff0000, M88K_PIA_NOTE_FP_ASSIGNMENT },
+
+ /* Store to stack instructions; either "st rx,sp,n" or "st.d rx,sp,n". */
+ { 0x241f0000, 0xfc1f0000, M88K_PIA_NOTE_ST }, /* st rx,sp,n */
+ { 0x201f0000, 0xfc1f0000, M88K_PIA_NOTE_STD }, /* st.d rs,sp,n */
+
+ /* Instructions needed for setting up r25 for pic code. */
+ { 0x5f200000, 0xffff0000, M88K_PIA_SKIP }, /* or.u r25,r0,offset_high */
+ { 0xcc000002, 0xffffffff, M88K_PIA_SKIP }, /* bsr.n Lab */
+ { 0x5b390000, 0xffff0000, M88K_PIA_SKIP }, /* or r25,r25,offset_low */
+ { 0xf7396001, 0xffffffff, M88K_PIA_SKIP }, /* Lab: addu r25,r25,r1 */
+
+ /* Various branch or jump instructions which have a delay slot --
+ these do not form part of the prologue, but the instruction in
+ the delay slot might be a store instruction which should be
+ noted. */
+ { 0xc4000000, 0xe4000000, M88K_PIA_NOTE_BRANCH },
+ /* br.n, bsr.n, bb0.n, or bb1.n */
+ { 0xec000000, 0xfc000000, M88K_PIA_NOTE_BRANCH }, /* bcnd.n */
+ { 0xf400c400, 0xfffff7e0, M88K_PIA_NOTE_BRANCH }, /* jmp.n or jsr.n */
+
+ /* Catch all. Ends prologue analysis. */
+ { 0x00000000, 0x00000000, M88K_PIA_NOTE_PROLOGUE_END }
+};
+
+/* Do a full analysis of the function prologue at PC and update CACHE
+ accordingly. Bail out early if LIMIT is reached. Return the
+ address where the analysis stopped. If LIMIT points beyond the
+ function prologue, the return address should be the end of the
+ prologue. */
+
+static CORE_ADDR
+m88k_analyze_prologue (CORE_ADDR pc, CORE_ADDR limit,
+ struct m88k_frame_cache *cache)
+{
+ CORE_ADDR end = limit;
+
+ /* Provide a dummy cache if necessary. */
+ if (cache == NULL)
+ {
+ size_t sizeof_saved_regs =
+ (M88K_R31_REGNUM + 1) * sizeof (struct trad_frame_saved_reg);
+
+ cache = alloca (sizeof (struct m88k_frame_cache));
+ cache->saved_regs = alloca (sizeof_saved_regs);
+
+ /* We only initialize the members we care about. */
+ cache->saved_regs[M88K_R1_REGNUM].addr = -1;
+ cache->fp_offset = -1;
+ }
+
+ while (pc < limit)
+ {
+ struct m88k_prologue_insn *pi = m88k_prologue_insn_table;
+ unsigned long insn = m88k_fetch_instruction (pc);
+
+ while ((insn & pi->mask) != pi->insn)
+ pi++;
+
+ switch (pi->action)
+ {
+ case M88K_PIA_SKIP:
+ /* If we have a frame pointer, and R1 has been saved,
+ consider this instruction as not being part of the
+ prologue. */
+ if (cache->fp_offset != -1
+ && cache->saved_regs[M88K_R1_REGNUM].addr != -1)
+ return min (pc, end);
+ break;
+
+ case M88K_PIA_NOTE_ST:
+ case M88K_PIA_NOTE_STD:
+ /* If no frame has been allocated, the stores aren't part of
+ the prologue. */
+ if (cache->sp_offset == 0)
+ return min (pc, end);
+
+ /* Record location of saved registers. */
+ {
+ int regnum = ST_SRC (insn) + M88K_R0_REGNUM;
+ ULONGEST offset = ST_OFFSET (insn);
+
+ cache->saved_regs[regnum].addr = offset;
+ if (pi->action == M88K_PIA_NOTE_STD && regnum < M88K_R31_REGNUM)
+ cache->saved_regs[regnum + 1].addr = offset + 4;
+ }
+ break;
+
+ case M88K_PIA_NOTE_SP_ADJUSTMENT:
+ /* A second stack pointer adjustment isn't part of the
+ prologue. */
+ if (cache->sp_offset != 0)
+ return min (pc, end);
+
+ /* Store stack pointer adjustment. */
+ cache->sp_offset = -SUBU_OFFSET (insn);
+ break;
+
+ case M88K_PIA_NOTE_FP_ASSIGNMENT:
+ /* A second frame pointer assignment isn't part of the
+ prologue. */
+ if (cache->fp_offset != -1)
+ return min (pc, end);
+
+ /* Record frame pointer assignment. */
+ cache->fp_offset = ADDU_OFFSET (insn);
+ break;
+
+ case M88K_PIA_NOTE_BRANCH:
+ /* The branch instruction isn't part of the prologue, but
+ the instruction in the delay slot might be. Limit the
+ prologue analysis to the delay slot and record the branch
+ instruction as the end of the prologue. */
+ limit = min (limit, pc + 2 * M88K_INSN_SIZE);
+ end = pc;
+ break;
+
+ case M88K_PIA_NOTE_PROLOGUE_END:
+ return min (pc, end);
+ }
+
+ pc += M88K_INSN_SIZE;
+ }
+
+ return end;
+}
+
+/* An upper limit to the size of the prologue. */
+const int m88k_max_prologue_size = 128 * M88K_INSN_SIZE;
+
+/* Return the address of first real instruction of the function
+ starting at PC. */
+
+static CORE_ADDR
+m88k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct symtab_and_line sal;
+ CORE_ADDR func_start, func_end;
+
+ /* This is the preferred method, find the end of the prologue by
+ using the debugging information. */
+ if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
+ {
+ sal = find_pc_line (func_start, 0);
+
+ if (sal.end < func_end && pc <= sal.end)
+ return sal.end;
+ }
+
+ return m88k_analyze_prologue (pc, pc + m88k_max_prologue_size, NULL);
+}
+
+struct m88k_frame_cache *
+m88k_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct m88k_frame_cache *cache;
+ CORE_ADDR frame_sp;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+ cache->fp_offset = -1;
+
+ cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME);
+ if (cache->pc != 0)
+ m88k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache);
+
+ /* Calculate the stack pointer used in the prologue. */
+ if (cache->fp_offset != -1)
+ {
+ CORE_ADDR fp;
+
+ fp = frame_unwind_register_unsigned (next_frame, M88K_R30_REGNUM);
+ frame_sp = fp - cache->fp_offset;
+ }
+ else
+ {
+ /* If we know where the return address is saved, we can take a
+ solid guess at what the frame pointer should be. */
+ if (cache->saved_regs[M88K_R1_REGNUM].addr != -1)
+ cache->fp_offset = cache->saved_regs[M88K_R1_REGNUM].addr - 4;
+ frame_sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
+ }
+
+ /* Now that we know the stack pointer, adjust the location of the
+ saved registers. */
+ {
+ int regnum;
+
+ for (regnum = M88K_R0_REGNUM; regnum < M88K_R31_REGNUM; regnum ++)
+ if (cache->saved_regs[regnum].addr != -1)
+ cache->saved_regs[regnum].addr += frame_sp;
+ }
+
+ /* Calculate the frame's base. */
+ cache->base = frame_sp - cache->sp_offset;
+ trad_frame_set_value (cache->saved_regs, M88K_R31_REGNUM, cache->base);
+
+ /* Identify SXIP with the return address in R1. */
+ cache->saved_regs[M88K_SXIP_REGNUM] = cache->saved_regs[M88K_R1_REGNUM];
+
+ *this_cache = cache;
+ return cache;
+}
+
+static void
+m88k_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
+
+ /* This marks the outermost frame. */
+ if (cache->base == 0)
+ return;
+
+ (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+m88k_frame_prev_register (struct frame_info *next_frame, void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *valuep)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
+
+ if (regnum == M88K_SNIP_REGNUM || regnum == M88K_SFIP_REGNUM)
+ {
+ if (valuep)
+ {
+ CORE_ADDR pc;
+
+ trad_frame_get_prev_register (next_frame, cache->saved_regs,
+ M88K_SXIP_REGNUM, optimizedp,
+ lvalp, addrp, realnump, valuep);
+
+ pc = extract_unsigned_integer (valuep, 4);
+ if (regnum == M88K_SFIP_REGNUM)
+ pc += 4;
+ store_unsigned_integer (valuep, 4, pc + 4);
+ }
+
+ /* It's a computed value. */
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ return;
+ }
+
+ trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m88k_frame_unwind =
+{
+ NORMAL_FRAME,
+ m88k_frame_this_id,
+ m88k_frame_prev_register
+};
+
+static const struct frame_unwind *
+m88k_frame_sniffer (struct frame_info *next_frame)
+{
+ return &m88k_frame_unwind;
+}
+\f
+
+static CORE_ADDR
+m88k_frame_base_address (struct frame_info *next_frame, void **this_cache)
+{
+ struct m88k_frame_cache *cache = m88k_frame_cache (next_frame, this_cache);
+
+ if (cache->fp_offset != -1)
+ return cache->base + cache->sp_offset + cache->fp_offset;
+
+ return 0;
+}
+
+static const struct frame_base m88k_frame_base =
+{
+ &m88k_frame_unwind,
+ m88k_frame_base_address,
+ m88k_frame_base_address,
+ m88k_frame_base_address
+};
+\f
+
+/* Core file support. */
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+ in the general-purpose register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+
+static void
+m88k_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ const gdb_byte *regs = gregs;
+ int i;
+
+ for (i = 0; i < M88K_NUM_REGS; i++)
+ {
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + i * 4);
+ }
+}
+
+/* Motorola 88000 register set. */
+
+static struct regset m88k_gregset =
+{
+ NULL,
+ m88k_supply_gregset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+
+static const struct regset *
+m88k_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= M88K_NUM_REGS * 4)
+ return &m88k_gregset;
+
+ return NULL;
+}
+\f
+
+static struct gdbarch *
+m88k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+
+ /* If there is already a candidate, use it. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ /* Allocate space for the new architecture. */
+ gdbarch = gdbarch_alloc (&info, NULL);
+
+ /* There is no real `long double'. */
+ set_gdbarch_long_double_bit (gdbarch, 64);
+ set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
+
+ set_gdbarch_num_regs (gdbarch, M88K_NUM_REGS);
+ set_gdbarch_register_name (gdbarch, m88k_register_name);
+ set_gdbarch_register_type (gdbarch, m88k_register_type);
+
+ /* Register numbers of various important registers. */
+ set_gdbarch_sp_regnum (gdbarch, M88K_R31_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, M88K_SXIP_REGNUM);
+
+ /* Core file support. */
+ set_gdbarch_regset_from_core_section
+ (gdbarch, m88k_regset_from_core_section);
+
+ set_gdbarch_print_insn (gdbarch, print_insn_m88k);
+
+ set_gdbarch_skip_prologue (gdbarch, m88k_skip_prologue);
+
+ /* Stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ /* Call dummy code. */
+ set_gdbarch_push_dummy_call (gdbarch, m88k_push_dummy_call);
+ set_gdbarch_unwind_dummy_id (gdbarch, m88k_unwind_dummy_id);
+
+ /* Return value info */
+ set_gdbarch_return_value (gdbarch, m88k_return_value);
+
+ set_gdbarch_addr_bits_remove (gdbarch, m88k_addr_bits_remove);
+ set_gdbarch_breakpoint_from_pc (gdbarch, m88k_breakpoint_from_pc);
+ set_gdbarch_unwind_pc (gdbarch, m88k_unwind_pc);
+ set_gdbarch_write_pc (gdbarch, m88k_write_pc);
+
+ frame_base_set_default (gdbarch, &m88k_frame_base);
+ frame_unwind_append_sniffer (gdbarch, m88k_frame_sniffer);
+
+ return gdbarch;
+}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_m88k_tdep (void);
+
+void
+_initialize_m88k_tdep (void)
+{
+ gdbarch_register (bfd_arch_m88k, m88k_gdbarch_init, NULL);
+}
projects / deliverable / binutils-gdb.git / blobdiff