/* Target dependent code for the Motorola 68000 series.
- Copyright (C) 1990 Free Software Foundation, Inc.
+ Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-GDB 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 1, or (at your option)
-any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-GDB 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.
+ 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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
-#include "ieee-float.h"
+#include "frame.h"
+#include "symtab.h"
+#include "gdbcore.h"
+#include "value.h"
+#include "gdb_string.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "arch-utils.h"
+\f
-const struct ext_format ext_format_68881 [] = {
-/* tot sbyte smask expbyte manbyte */
- { 12, 0, 0x80, 0,1, 4,8 }, /* mc68881 */
+#define P_LINKL_FP 0x480e
+#define P_LINKW_FP 0x4e56
+#define P_PEA_FP 0x4856
+#define P_MOVL_SP_FP 0x2c4f
+#define P_MOVL 0x207c
+#define P_JSR 0x4eb9
+#define P_BSR 0x61ff
+#define P_LEAL 0x43fb
+#define P_MOVML 0x48ef
+#define P_FMOVM 0xf237
+#define P_TRAP 0x4e40
+
+
+/* Register numbers of various important registers.
+ Note that some of these values are "real" register numbers,
+ and correspond to the general registers of the machine,
+ and some are "phony" register numbers which are too large
+ to be actual register numbers as far as the user is concerned
+ but do serve to get the desired values when passed to read_register. */
+
+/* Note: Since they are used in files other than this (monitor files),
+ D0_REGNUM and A0_REGNUM are currently defined in tm-m68k.h. */
+
+enum
+{
+ E_A1_REGNUM = 9,
+ E_FP_REGNUM = 14, /* Contains address of executing stack frame */
+ E_SP_REGNUM = 15, /* Contains address of top of stack */
+ E_PS_REGNUM = 16, /* Contains processor status */
+ E_PC_REGNUM = 17, /* Contains program counter */
+ E_FP0_REGNUM = 18, /* Floating point register 0 */
+ E_FPC_REGNUM = 26, /* 68881 control register */
+ E_FPS_REGNUM = 27, /* 68881 status register */
+ E_FPI_REGNUM = 28
};
+
+#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
+#define REGISTER_BYTES_NOFP (16*4 + 8)
+
+#define NUM_FREGS (NUM_REGS-24)
+
+/* Offset from SP to first arg on stack at first instruction of a function */
+
+#define SP_ARG0 (1 * 4)
+
+/* This was determined by experimentation on hp300 BSD 4.3. Perhaps
+ it corresponds to some offset in /usr/include/sys/user.h or
+ something like that. Using some system include file would
+ have the advantage of probably being more robust in the face
+ of OS upgrades, but the disadvantage of being wrong for
+ cross-debugging. */
+
+#define SIG_PC_FP_OFFSET 530
+
+#define TARGET_M68K
+
+
+#if !defined (BPT_VECTOR)
+#define BPT_VECTOR 0xf
+#endif
+
+#if !defined (REMOTE_BPT_VECTOR)
+#define REMOTE_BPT_VECTOR 1
+#endif
+
+
+void m68k_frame_init_saved_regs (struct frame_info *frame_info);
+
+
+/* gdbarch_breakpoint_from_pc is set to m68k_local_breakpoint_from_pc
+ so m68k_remote_breakpoint_from_pc is currently not used. */
+
+const static unsigned char *
+m68k_remote_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_BPT_VECTOR)};
+ *lenptr = sizeof (break_insn);
+ return break_insn;
+}
+
+const static unsigned char *
+m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)};
+ *lenptr = sizeof (break_insn);
+ return break_insn;
+}
+
+
+static int
+m68k_register_bytes_ok (long numbytes)
+{
+ return ((numbytes == REGISTER_BYTES_FP)
+ || (numbytes == REGISTER_BYTES_NOFP));
+}
+
+/* Number of bytes of storage in the actual machine representation
+ for register regnum. On the 68000, all regs are 4 bytes
+ except the floating point regs which are 12 bytes. */
+/* Note that the unsigned cast here forces the result of the
+ subtraction to very high positive values if regnum < FP0_REGNUM */
+
+static int
+m68k_register_raw_size (int regnum)
+{
+ return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4);
+}
+
+/* Number of bytes of storage in the program's representation
+ for register regnum. On the 68000, all regs are 4 bytes
+ except the floating point regs which are 12-byte long doubles. */
+
+static int
+m68k_register_virtual_size (int regnum)
+{
+ return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4);
+}
+
+/* Return the GDB type object for the "standard" data type of data
+ in register N. This should be int for D0-D7, long double for FP0-FP7,
+ and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc).
+ Note, for registers which contain addresses return pointer to void,
+ not pointer to char, because we don't want to attempt to print
+ the string after printing the address. */
+
+static struct type *
+m68k_register_virtual_type (int regnum)
+{
+ if ((unsigned) regnum >= E_FPC_REGNUM)
+ return lookup_pointer_type (builtin_type_void);
+ else if ((unsigned) regnum >= FP0_REGNUM)
+ return builtin_type_long_double;
+ else if ((unsigned) regnum >= A0_REGNUM)
+ return lookup_pointer_type (builtin_type_void);
+ else
+ return builtin_type_int;
+}
+
+/* Function: m68k_register_name
+ Returns the name of the standard m68k register regnum. */
+
+static const char *
+m68k_register_name (int regnum)
+{
+ static char *register_names[] = {
+ "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7",
+ "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp",
+ "ps", "pc",
+ "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7",
+ "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags"
+ };
+
+ if (regnum < 0 ||
+ regnum >= sizeof (register_names) / sizeof (register_names[0]))
+ internal_error (__FILE__, __LINE__,
+ "m68k_register_name: illegal register number %d", regnum);
+ else
+ return register_names[regnum];
+}
+
+/* Stack must be kept short aligned when doing function calls. */
+
+static CORE_ADDR
+m68k_stack_align (CORE_ADDR addr)
+{
+ return ((addr + 1) & ~1);
+}
+
+/* Index within `registers' of the first byte of the space for
+ register regnum. */
+
+static int
+m68k_register_byte (int regnum)
+{
+ if (regnum >= E_FPC_REGNUM)
+ return (((regnum - E_FPC_REGNUM) * 4) + 168);
+ else if (regnum >= FP0_REGNUM)
+ return (((regnum - FP0_REGNUM) * 12) + 72);
+ else
+ return (regnum * 4);
+}
+
+/* Store the address of the place in which to copy the structure the
+ subroutine will return. This is called from call_function. */
+
+static void
+m68k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ write_register (E_A1_REGNUM, addr);
+}
+
+/* Extract from an array regbuf containing the (raw) register state
+ a function return value of type type, and copy that, in virtual format,
+ into valbuf. This is assuming that floating point values are returned
+ as doubles in d0/d1. */
+
+static void
+m68k_deprecated_extract_return_value (struct type *type, char *regbuf,
+ char *valbuf)
+{
+ int offset = 0;
+ int typeLength = TYPE_LENGTH (type);
+
+ if (typeLength < 4)
+ offset = 4 - typeLength;
+
+ memcpy (valbuf, regbuf + offset, typeLength);
+}
+
+static CORE_ADDR
+m68k_deprecated_extract_struct_value_address (char *regbuf)
+{
+ return (*(CORE_ADDR *) (regbuf));
+}
+
+/* Write into appropriate registers a function return value
+ of type TYPE, given in virtual format. Assumes floats are passed
+ in d0/d1. */
+
+static void
+m68k_store_return_value (struct type *type, char *valbuf)
+{
+ write_register_bytes (0, valbuf, TYPE_LENGTH (type));
+}
+
+/* Describe the pointer in each stack frame to the previous stack frame
+ (its caller). */
+
+/* FRAME_CHAIN takes a frame's nominal address and produces the frame's
+ chain-pointer.
+ In the case of the 68000, the frame's nominal address
+ is the address of a 4-byte word containing the calling frame's address. */
+
+/* If we are chaining from sigtramp, then manufacture a sigtramp frame
+ (which isn't really on the stack. I'm not sure this is right for anything
+ but BSD4.3 on an hp300. */
+
+static CORE_ADDR
+m68k_frame_chain (struct frame_info *thisframe)
+{
+ if (thisframe->signal_handler_caller)
+ return thisframe->frame;
+ else if (!inside_entry_file ((thisframe)->pc))
+ return read_memory_integer ((thisframe)->frame, 4);
+ else
+ return 0;
+}
+
+/* A function that tells us whether the function invocation represented
+ by fi does not have a frame on the stack associated with it. If it
+ does not, FRAMELESS is set to 1, else 0. */
+
+static int
+m68k_frameless_function_invocation (struct frame_info *fi)
+{
+ if (fi->signal_handler_caller)
+ return 0;
+ else
+ return frameless_look_for_prologue (fi);
+}
+
+static CORE_ADDR
+m68k_frame_saved_pc (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ {
+ if (frame->next)
+ return read_memory_integer (frame->next->frame + SIG_PC_FP_OFFSET, 4);
+ else
+ return read_memory_integer (read_register (SP_REGNUM)
+ + SIG_PC_FP_OFFSET - 8, 4);
+ }
+ else
+ return read_memory_integer (frame->frame + 4, 4);
+}
+
+
+/* The only reason this is here is the tm-altos.h reference below. It
+ was moved back here from tm-m68k.h. FIXME? */
+
+extern CORE_ADDR
+altos_skip_prologue (CORE_ADDR pc)
+{
+ register int op = read_memory_integer (pc, 2);
+ if (op == P_LINKW_FP)
+ pc += 4; /* Skip link #word */
+ else if (op == P_LINKL_FP)
+ pc += 6; /* Skip link #long */
+ /* Not sure why branches are here. */
+ /* From tm-altos.h */
+ else if (op == 0060000)
+ pc += 4; /* Skip bra #word */
+ else if (op == 00600377)
+ pc += 6; /* skip bra #long */
+ else if ((op & 0177400) == 0060000)
+ pc += 2; /* skip bra #char */
+ return pc;
+}
+
+int
+delta68_in_sigtramp (CORE_ADDR pc, char *name)
+{
+ if (name != NULL)
+ return strcmp (name, "_sigcode") == 0;
+ else
+ return 0;
+}
+
+CORE_ADDR
+delta68_frame_args_address (struct frame_info *frame_info)
+{
+ /* we assume here that the only frameless functions are the system calls
+ or other functions who do not put anything on the stack. */
+ if (frame_info->signal_handler_caller)
+ return frame_info->frame + 12;
+ else if (frameless_look_for_prologue (frame_info))
+ {
+ /* Check for an interrupted system call */
+ if (frame_info->next && frame_info->next->signal_handler_caller)
+ return frame_info->next->frame + 16;
+ else
+ return frame_info->frame + 4;
+ }
+ else
+ return frame_info->frame;
+}
+
+CORE_ADDR
+delta68_frame_saved_pc (struct frame_info *frame_info)
+{
+ return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4);
+}
+
+/* Return number of args passed to a frame.
+ Can return -1, meaning no way to tell. */
+
+int
+isi_frame_num_args (struct frame_info *fi)
+{
+ int val;
+ CORE_ADDR pc = FRAME_SAVED_PC (fi);
+ int insn = 0177777 & read_memory_integer (pc, 2);
+ val = 0;
+ if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
+ val = read_memory_integer (pc + 2, 2);
+ else if ((insn & 0170777) == 0050217 /* addql #N, sp */
+ || (insn & 0170777) == 0050117) /* addqw */
+ {
+ val = (insn >> 9) & 7;
+ if (val == 0)
+ val = 8;
+ }
+ else if (insn == 0157774) /* addal #WW, sp */
+ val = read_memory_integer (pc + 2, 4);
+ val >>= 2;
+ return val;
+}
+
+int
+delta68_frame_num_args (struct frame_info *fi)
+{
+ int val;
+ CORE_ADDR pc = FRAME_SAVED_PC (fi);
+ int insn = 0177777 & read_memory_integer (pc, 2);
+ val = 0;
+ if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
+ val = read_memory_integer (pc + 2, 2);
+ else if ((insn & 0170777) == 0050217 /* addql #N, sp */
+ || (insn & 0170777) == 0050117) /* addqw */
+ {
+ val = (insn >> 9) & 7;
+ if (val == 0)
+ val = 8;
+ }
+ else if (insn == 0157774) /* addal #WW, sp */
+ val = read_memory_integer (pc + 2, 4);
+ val >>= 2;
+ return val;
+}
+
+int
+news_frame_num_args (struct frame_info *fi)
+{
+ int val;
+ CORE_ADDR pc = FRAME_SAVED_PC (fi);
+ int insn = 0177777 & read_memory_integer (pc, 2);
+ val = 0;
+ if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */
+ val = read_memory_integer (pc + 2, 2);
+ else if ((insn & 0170777) == 0050217 /* addql #N, sp */
+ || (insn & 0170777) == 0050117) /* addqw */
+ {
+ val = (insn >> 9) & 7;
+ if (val == 0)
+ val = 8;
+ }
+ else if (insn == 0157774) /* addal #WW, sp */
+ val = read_memory_integer (pc + 2, 4);
+ val >>= 2;
+ return val;
+}
+
+/* Insert the specified number of args and function address
+ into a call sequence of the above form stored at DUMMYNAME.
+ We use the BFD routines to store a big-endian value of known size. */
+
+void
+m68k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ bfd_putb32 (fun, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 2);
+ bfd_putb32 (nargs * 4,
+ (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 8);
+}
+
+
+/* Push an empty stack frame, to record the current PC, etc. */
+
+void
+m68k_push_dummy_frame (void)
+{
+ register CORE_ADDR sp = read_register (SP_REGNUM);
+ register int regnum;
+ char raw_buffer[12];
+
+ sp = push_word (sp, read_register (PC_REGNUM));
+ sp = push_word (sp, read_register (FP_REGNUM));
+ write_register (FP_REGNUM, sp);
+
+ /* Always save the floating-point registers, whether they exist on
+ this target or not. */
+ for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ {
+ read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
+ sp = push_bytes (sp, raw_buffer, 12);
+ }
+
+ for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
+ {
+ sp = push_word (sp, read_register (regnum));
+ }
+ sp = push_word (sp, read_register (PS_REGNUM));
+ write_register (SP_REGNUM, sp);
+}
+
+/* Discard from the stack the innermost frame,
+ restoring all saved registers. */
+
+void
+m68k_pop_frame (void)
+{
+ register struct frame_info *frame = get_current_frame ();
+ register CORE_ADDR fp;
+ register int regnum;
+ char raw_buffer[12];
+
+ fp = FRAME_FP (frame);
+ m68k_frame_init_saved_regs (frame);
+ for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--)
+ {
+ if (frame->saved_regs[regnum])
+ {
+ read_memory (frame->saved_regs[regnum], raw_buffer, 12);
+ write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12);
+ }
+ }
+ for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)
+ {
+ if (frame->saved_regs[regnum])
+ {
+ write_register (regnum,
+ read_memory_integer (frame->saved_regs[regnum], 4));
+ }
+ }
+ if (frame->saved_regs[PS_REGNUM])
+ {
+ write_register (PS_REGNUM,
+ read_memory_integer (frame->saved_regs[PS_REGNUM], 4));
+ }
+ write_register (FP_REGNUM, read_memory_integer (fp, 4));
+ write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
+ write_register (SP_REGNUM, fp + 8);
+ flush_cached_frames ();
+}
+\f
+
+/* Given an ip value corresponding to the start of a function,
+ return the ip of the first instruction after the function
+ prologue. This is the generic m68k support. Machines which
+ require something different can override the SKIP_PROLOGUE
+ macro to point elsewhere.
+
+ Some instructions which typically may appear in a function
+ prologue include:
+
+ A link instruction, word form:
+
+ link.w %a6,&0 4e56 XXXX
+
+ A link instruction, long form:
+
+ link.l %fp,&F%1 480e XXXX XXXX
+
+ A movm instruction to preserve integer regs:
+
+ movm.l &M%1,(4,%sp) 48ef XXXX XXXX
+
+ A fmovm instruction to preserve float regs:
+
+ fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX
+
+ Some profiling setup code (FIXME, not recognized yet):
+
+ lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX
+ bsr _mcount 61ff XXXX XXXX
+
+ */
+
+CORE_ADDR
+m68k_skip_prologue (CORE_ADDR ip)
+{
+ register CORE_ADDR limit;
+ struct symtab_and_line sal;
+ register int op;
+
+ /* Find out if there is a known limit for the extent of the prologue.
+ If so, ensure we don't go past it. If not, assume "infinity". */
+
+ sal = find_pc_line (ip, 0);
+ limit = (sal.end) ? sal.end : (CORE_ADDR) ~0;
+
+ while (ip < limit)
+ {
+ op = read_memory_integer (ip, 2);
+ op &= 0xFFFF;
+
+ if (op == P_LINKW_FP)
+ ip += 4; /* Skip link.w */
+ else if (op == P_PEA_FP)
+ ip += 2; /* Skip pea %fp */
+ else if (op == P_MOVL_SP_FP)
+ ip += 2; /* Skip move.l %sp, %fp */
+ else if (op == P_LINKL_FP)
+ ip += 6; /* Skip link.l */
+ else if (op == P_MOVML)
+ ip += 6; /* Skip movm.l */
+ else if (op == P_FMOVM)
+ ip += 10; /* Skip fmovm */
+ else
+ break; /* Found unknown code, bail out. */
+ }
+ return (ip);
+}
+
+/* Store the addresses of the saved registers of the frame described by
+ FRAME_INFO in its saved_regs field.
+ This includes special registers such as pc and fp saved in special
+ ways in the stack frame. sp is even more special:
+ the address we return for it IS the sp for the next frame. */
+
+void
+m68k_frame_init_saved_regs (struct frame_info *frame_info)
+{
+ register int regnum;
+ register int regmask;
+ register CORE_ADDR next_addr;
+ register CORE_ADDR pc;
+
+ /* First possible address for a pc in a call dummy for this frame. */
+ CORE_ADDR possible_call_dummy_start =
+ (frame_info)->frame - 28 - FP_REGNUM * 4 - 4 - 8 * 12;
+
+ int nextinsn;
+
+ if (frame_info->saved_regs)
+ return;
+
+ frame_saved_regs_zalloc (frame_info);
+
+ memset (frame_info->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS);
+
+ if ((frame_info)->pc >= possible_call_dummy_start
+ && (frame_info)->pc <= (frame_info)->frame)
+ {
+
+ /* It is a call dummy. We could just stop now, since we know
+ what the call dummy saves and where. But this code proceeds
+ to parse the "prologue" which is part of the call dummy.
+ This is needlessly complex and confusing. FIXME. */
+
+ next_addr = (frame_info)->frame;
+ pc = possible_call_dummy_start;
+ }
+ else
+ {
+ pc = get_pc_function_start ((frame_info)->pc);
+
+ nextinsn = read_memory_integer (pc, 2);
+ if (P_PEA_FP == nextinsn
+ && P_MOVL_SP_FP == read_memory_integer (pc + 2, 2))
+ {
+ /* pea %fp
+ move.l %sp, %fp */
+ next_addr = frame_info->frame;
+ pc += 4;
+ }
+ else if (P_LINKL_FP == nextinsn)
+ /* link.l %fp */
+ /* Find the address above the saved
+ regs using the amount of storage from the link instruction. */
+ {
+ next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4);
+ pc += 6;
+ }
+ else if (P_LINKW_FP == nextinsn)
+ /* link.w %fp */
+ /* Find the address above the saved
+ regs using the amount of storage from the link instruction. */
+ {
+ next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2);
+ pc += 4;
+ }
+ else
+ goto lose;
+
+ /* If have an addal #-n, sp next, adjust next_addr. */
+ if ((0177777 & read_memory_integer (pc, 2)) == 0157774)
+ next_addr += read_memory_integer (pc += 2, 4), pc += 4;
+ }
+
+ for (;;)
+ {
+ nextinsn = 0xffff & read_memory_integer (pc, 2);
+ regmask = read_memory_integer (pc + 2, 2);
+ /* fmovemx to -(sp) */
+ if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000)
+ {
+ /* Regmask's low bit is for register fp7, the first pushed */
+ for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
+ if (regmask & 1)
+ frame_info->saved_regs[regnum] = (next_addr -= 12);
+ pc += 4;
+ }
+ /* fmovemx to (fp + displacement) */
+ else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000)
+ {
+ register CORE_ADDR addr;
+
+ addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
+ /* Regmask's low bit is for register fp7, the first pushed */
+ for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
+ if (regmask & 1)
+ {
+ frame_info->saved_regs[regnum] = addr;
+ addr += 12;
+ }
+ pc += 6;
+ }
+ /* moveml to (sp) */
+ else if (0044327 == nextinsn)
+ {
+ /* Regmask's low bit is for register 0, the first written */
+ for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
+ if (regmask & 1)
+ {
+ frame_info->saved_regs[regnum] = next_addr;
+ next_addr += 4;
+ }
+ pc += 4;
+ }
+ /* moveml to (fp + displacement) */
+ else if (0044356 == nextinsn)
+ {
+ register CORE_ADDR addr;
+
+ addr = (frame_info)->frame + read_memory_integer (pc + 4, 2);
+ /* Regmask's low bit is for register 0, the first written */
+ for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)
+ if (regmask & 1)
+ {
+ frame_info->saved_regs[regnum] = addr;
+ addr += 4;
+ }
+ pc += 6;
+ }
+ /* moveml to -(sp) */
+ else if (0044347 == nextinsn)
+ {
+ /* Regmask's low bit is for register 15, the first pushed */
+ for (regnum = 16; --regnum >= 0; regmask >>= 1)
+ if (regmask & 1)
+ frame_info->saved_regs[regnum] = (next_addr -= 4);
+ pc += 4;
+ }
+ /* movl r,-(sp) */
+ else if (0x2f00 == (0xfff0 & nextinsn))
+ {
+ regnum = 0xf & nextinsn;
+ frame_info->saved_regs[regnum] = (next_addr -= 4);
+ pc += 2;
+ }
+ /* fmovemx to index of sp */
+ else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000)
+ {
+ /* Regmask's low bit is for register fp0, the first written */
+ for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1)
+ if (regmask & 1)
+ {
+ frame_info->saved_regs[regnum] = next_addr;
+ next_addr += 12;
+ }
+ pc += 10;
+ }
+ /* clrw -(sp); movw ccr,-(sp) */
+ else if (0x4267 == nextinsn && 0x42e7 == regmask)
+ {
+ frame_info->saved_regs[PS_REGNUM] = (next_addr -= 4);
+ pc += 4;
+ }
+ else
+ break;
+ }
+lose:;
+ frame_info->saved_regs[SP_REGNUM] = (frame_info)->frame + 8;
+ frame_info->saved_regs[FP_REGNUM] = (frame_info)->frame;
+ frame_info->saved_regs[PC_REGNUM] = (frame_info)->frame + 4;
+#ifdef SIG_SP_FP_OFFSET
+ /* Adjust saved SP_REGNUM for fake _sigtramp frames. */
+ if (frame_info->signal_handler_caller && frame_info->next)
+ frame_info->saved_regs[SP_REGNUM] =
+ frame_info->next->frame + SIG_SP_FP_OFFSET;
+#endif
+}
+
+
+#ifdef USE_PROC_FS /* Target dependent support for /proc */
+
+#include <sys/procfs.h>
+
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
+/* The /proc interface divides the target machine's register set up into
+ two different sets, the general register set (gregset) and the floating
+ point register set (fpregset). For each set, there is an ioctl to get
+ the current register set and another ioctl to set the current values.
+
+ The actual structure passed through the ioctl interface is, of course,
+ naturally machine dependent, and is different for each set of registers.
+ For the m68k for example, the general register set is typically defined
+ by:
+
+ typedef int gregset_t[18];
+
+ #define R_D0 0
+ ...
+ #define R_PS 17
+
+ and the floating point set by:
+
+ typedef struct fpregset {
+ int f_pcr;
+ int f_psr;
+ int f_fpiaddr;
+ int f_fpregs[8][3]; (8 regs, 96 bits each)
+ } fpregset_t;
+
+ These routines provide the packing and unpacking of gregset_t and
+ fpregset_t formatted data.
+
+ */
+
+/* Atari SVR4 has R_SR but not R_PS */
+
+#if !defined (R_PS) && defined (R_SR)
+#define R_PS R_SR
+#endif
+
+/* Given a pointer to a general register set in /proc format (gregset_t *),
+ unpack the register contents and supply them as gdb's idea of the current
+ register values. */
+
+void
+supply_gregset (gregset_t *gregsetp)
+{
+ register int regi;
+ register greg_t *regp = (greg_t *) gregsetp;
+
+ for (regi = 0; regi < R_PC; regi++)
+ {
+ supply_register (regi, (char *) (regp + regi));
+ }
+ supply_register (PS_REGNUM, (char *) (regp + R_PS));
+ supply_register (PC_REGNUM, (char *) (regp + R_PC));
+}
+
+void
+fill_gregset (gregset_t *gregsetp, int regno)
+{
+ register int regi;
+ register greg_t *regp = (greg_t *) gregsetp;
+
+ for (regi = 0; regi < R_PC; regi++)
+ {
+ if ((regno == -1) || (regno == regi))
+ {
+ *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)];
+ }
+ }
+ if ((regno == -1) || (regno == PS_REGNUM))
+ {
+ *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
+ }
+ if ((regno == -1) || (regno == PC_REGNUM))
+ {
+ *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+ }
+}
+
+#if defined (FP0_REGNUM)
+
+/* Given a pointer to a floating point register set in /proc format
+ (fpregset_t *), unpack the register contents and supply them as gdb's
+ idea of the current floating point register values. */
+
+void
+supply_fpregset (fpregset_t *fpregsetp)
+{
+ register int regi;
+ char *from;
+
+ for (regi = FP0_REGNUM; regi < E_FPC_REGNUM; regi++)
+ {
+ from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
+ supply_register (regi, from);
+ }
+ supply_register (E_FPC_REGNUM, (char *) &(fpregsetp->f_pcr));
+ supply_register (E_FPS_REGNUM, (char *) &(fpregsetp->f_psr));
+ supply_register (E_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr));
+}
+
+/* Given a pointer to a floating point register set in /proc format
+ (fpregset_t *), update the register specified by REGNO from gdb's idea
+ of the current floating point register set. If REGNO is -1, update
+ them all. */
+
+void
+fill_fpregset (fpregset_t *fpregsetp, int regno)
+{
+ int regi;
+ char *to;
+ char *from;
+
+ for (regi = FP0_REGNUM; regi < E_FPC_REGNUM; regi++)
+ {
+ if ((regno == -1) || (regno == regi))
+ {
+ from = (char *) ®isters[REGISTER_BYTE (regi)];
+ to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]);
+ memcpy (to, from, REGISTER_RAW_SIZE (regi));
+ }
+ }
+ if ((regno == -1) || (regno == E_FPC_REGNUM))
+ {
+ fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (E_FPC_REGNUM)];
+ }
+ if ((regno == -1) || (regno == E_FPS_REGNUM))
+ {
+ fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (E_FPS_REGNUM)];
+ }
+ if ((regno == -1) || (regno == E_FPI_REGNUM))
+ {
+ fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (E_FPI_REGNUM)];
+ }
+}
+
+#endif /* defined (FP0_REGNUM) */
+
+#endif /* USE_PROC_FS */
+
+/* Figure out where the longjmp will land. Slurp the args out of the stack.
+ We expect the first arg to be a pointer to the jmp_buf structure from which
+ we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
+ This routine returns true on success. */
+
+/* NOTE: cagney/2000-11-08: For this function to be fully multi-arched
+ the macro's JB_PC and JB_ELEMENT_SIZE would need to be moved into
+ the ``struct gdbarch_tdep'' object and then set on a target ISA/ABI
+ dependant basis. */
+
+int
+m68k_get_longjmp_target (CORE_ADDR *pc)
+{
+#if defined (JB_PC) && defined (JB_ELEMENT_SIZE)
+ char *buf;
+ CORE_ADDR sp, jb_addr;
+
+ buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ sp = read_register (SP_REGNUM);
+
+ if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
+ buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ return 0;
+
+ jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+ if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
+ TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ return 0;
+
+ *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+ return 1;
+#else
+ internal_error (__FILE__, __LINE__,
+ "m68k_get_longjmp_target: not implemented");
+ return 0;
+#endif
+}
+
+/* Immediately after a function call, return the saved pc before the frame
+ is setup. For sun3's, we check for the common case of being inside of a
+ system call, and if so, we know that Sun pushes the call # on the stack
+ prior to doing the trap. */
+
+CORE_ADDR
+m68k_saved_pc_after_call (struct frame_info *frame)
+{
+#ifdef SYSCALL_TRAP
+ int op;
+
+ op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2);
+
+ if (op == SYSCALL_TRAP)
+ return read_memory_integer (read_register (SP_REGNUM) + 4, 4);
+ else
+#endif /* SYSCALL_TRAP */
+ return read_memory_integer (read_register (SP_REGNUM), 4);
+}
+
+/* Function: m68k_gdbarch_init
+ Initializer function for the m68k gdbarch vector.
+ Called by gdbarch. Sets up the gdbarch vector(s) for this target. */
+
+static struct gdbarch *
+m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ static LONGEST call_dummy_words[7] = { 0xf227e0ff, 0x48e7fffc, 0x426742e7,
+ 0x4eb93232, 0x3232dffc, 0x69696969,
+ (0x4e404e71 | (BPT_VECTOR << 16))
+ };
+ struct gdbarch_tdep *tdep = NULL;
+ struct gdbarch *gdbarch;
+
+ /* find a candidate among the list of pre-declared architectures. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return (arches->gdbarch);
+
+#if 0
+ tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
+#endif
+
+ gdbarch = gdbarch_alloc (&info, 0);
+
+ set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext);
+ set_gdbarch_long_double_bit (gdbarch, 96);
+
+ set_gdbarch_function_start_offset (gdbarch, 0);
+
+ set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue);
+ set_gdbarch_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call);
+ set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc);
+
+ /* Stack grows down. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ set_gdbarch_stack_align (gdbarch, m68k_stack_align);
+
+
+ set_gdbarch_believe_pcc_promotion (gdbarch, 1);
+ set_gdbarch_decr_pc_after_break (gdbarch, 2);
+
+ set_gdbarch_store_struct_return (gdbarch, m68k_store_struct_return);
+ set_gdbarch_deprecated_extract_return_value (gdbarch,
+ m68k_deprecated_extract_return_value);
+ set_gdbarch_store_return_value (gdbarch, m68k_store_return_value);
+
+ set_gdbarch_frame_chain (gdbarch, m68k_frame_chain);
+ set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid);
+ set_gdbarch_frame_saved_pc (gdbarch, m68k_frame_saved_pc);
+ set_gdbarch_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs);
+ set_gdbarch_frameless_function_invocation (gdbarch,
+ m68k_frameless_function_invocation);
+ /* OK to default this value to 'unknown'. */
+ set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
+ set_gdbarch_frame_args_skip (gdbarch, 8);
+ set_gdbarch_frame_args_address (gdbarch, default_frame_address);
+ set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
+
+ set_gdbarch_register_raw_size (gdbarch, m68k_register_raw_size);
+ set_gdbarch_register_virtual_size (gdbarch, m68k_register_virtual_size);
+ set_gdbarch_max_register_raw_size (gdbarch, 12);
+ set_gdbarch_max_register_virtual_size (gdbarch, 12);
+ set_gdbarch_register_virtual_type (gdbarch, m68k_register_virtual_type);
+ set_gdbarch_register_name (gdbarch, m68k_register_name);
+ set_gdbarch_register_size (gdbarch, 4);
+ set_gdbarch_register_byte (gdbarch, m68k_register_byte);
+ set_gdbarch_num_regs (gdbarch, 29);
+ set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok);
+ set_gdbarch_register_bytes (gdbarch, (16 * 4 + 8 + 8 * 12 + 3 * 4));
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
+ set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_ps_regnum (gdbarch, E_PS_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, E_FP0_REGNUM);
+
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 24);
+ set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_call_dummy_length (gdbarch, 28);
+ set_gdbarch_call_dummy_start_offset (gdbarch, 12);
+
+ set_gdbarch_call_dummy_words (gdbarch, call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_words));
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+ set_gdbarch_fix_call_dummy (gdbarch, m68k_fix_call_dummy);
+ set_gdbarch_push_dummy_frame (gdbarch, m68k_push_dummy_frame);
+ set_gdbarch_pop_frame (gdbarch, m68k_pop_frame);
+
+ return gdbarch;
+}
+
+
+static void
+m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+{
+
+}
+
+void
+_initialize_m68k_tdep (void)
+{
+ gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep);
+ tm_print_insn = print_insn_m68k;
+}