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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/* Generic 68000 stuff, to be included by other tm-*.h files.
- Define HAVE_68881 if that is the case. */
+/* Generic 68000 stuff, to be included by other tm-*.h files. */
-#if defined (HAVE_68881)
#define IEEE_FLOAT 1
-#endif
/* Define the bit, byte, and word ordering of the machine. */
#define TARGET_BYTE_ORDER BIG_ENDIAN
the new frame is not set up until the new function executes
some instructions. */
+#ifdef __STDC__
+struct frame_info;
+struct frame_saved_regs;
+#endif
+
+extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *));
+extern void m68k_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
+
#define SAVED_PC_AFTER_CALL(frame) \
-read_memory_integer (read_register (SP_REGNUM), 4)
+ m68k_saved_pc_after_call(frame)
/* Stack grows downward. */
-#define INNER_THAN <
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* Stack must be kept short aligned when doing function calls. */
+
+#define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1)
/* Sequence of bytes for breakpoint instruction.
This is a TRAP instruction. The last 4 bits (0xf below) is the
#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
#endif
+/* We default to vector 1 for the "remote" target, but allow targets
+ to override. */
+#if !defined (REMOTE_BPT_VECTOR)
+#define REMOTE_BPT_VECTOR 1
+#endif
+
+#if !defined (REMOTE_BREAKPOINT)
+#define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)}
+#endif
+
/* If your kernel resets the pc after the trap happens you may need to
define this before including this file. */
#define DECR_PC_AFTER_BREAK 2
#endif
-/* Nonzero if instruction at PC is a return instruction. */
-/* Allow any of the return instructions, including a trapv and a return
- from interupt. */
+/* Say how long (ordinary) registers are. This is a piece of bogosity
+ used in push_word and a few other places; REGISTER_RAW_SIZE is the
+ real way to know how big a register is. */
-#define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74)
+#define REGISTER_SIZE 4
-/* Return 1 if P points to an invalid floating point value. */
+#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
+#define REGISTER_BYTES_NOFP (16*4 + 8)
-#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
+#ifndef NUM_REGS
+#define NUM_REGS 29
+#endif
-/* Say how long registers are. */
+#define NUM_FREGS (NUM_REGS-24)
-#define REGISTER_TYPE long
+#ifndef REGISTER_BYTES_OK
+#define REGISTER_BYTES_OK(b) \
+ ((b) == REGISTER_BYTES_FP \
+ || (b) == REGISTER_BYTES_NOFP)
+#endif
-#if defined (HAVE_68881)
-# if defined (GDB_TARGET_IS_SUN3)
- /* Sun3 status includes fpflags, which shows whether the FPU has been used
- by the process, and whether the FPU was done with an instruction or
- was interrupted in the middle of a long instruction. See
- <machine/reg.h>. */
- /* a&d, pc,sr, fp, fpstat, fpflags */
-# define NUM_REGS 31
-# define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4)
-# else /* Not sun3. */
-# define NUM_REGS 29
-# define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
-# endif /* Not sun3. */
-#else /* No 68881. */
-# define NUM_REGS 18
-# define REGISTER_BYTES (16*4 + 8)
-#endif /* No 68881. */
+#ifndef REGISTER_BYTES
+#define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
+#endif
/* Index within `registers' of the first byte of the space for
register N. */
-#if defined (HAVE_68881)
#define REGISTER_BYTE(N) \
((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \
: (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \
#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
-/* Put the declaration out here because if it's in the macros, PCC
- will complain. */
-extern const struct ext_format ext_format_68881;
-
-/* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
-{ \
- if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
- ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \
- else \
- memcpy ((TO), (FROM), 4); \
-}
-
-/* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
-{ \
- if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
- double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \
- else \
- memcpy ((TO), (FROM), 4); \
-}
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-/* 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. */
-#define REGISTER_VIRTUAL_TYPE(N) \
- (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : \
- (N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM ? \
- lookup_pointer_type (builtin_type_void) : builtin_type_int)
-
-#else /* no 68881. */
-/* Index within `registers' of the first byte of the space for
- register N. */
-
-#define REGISTER_BYTE(N) ((N) * 4)
-
-/* Number of bytes of storage in the actual machine representation
- for register N. On the 68000, all regs are 4 bytes. */
-
-#define REGISTER_RAW_SIZE(N) 4
-
-/* Number of bytes of storage in the program's representation
- for register N. On the 68000, all regs are 4 bytes. */
-
-#define REGISTER_VIRTUAL_SIZE(N) 4
-
-/* Largest value REGISTER_RAW_SIZE can have. */
-
-#define MAX_REGISTER_RAW_SIZE 4
-
-/* Largest value REGISTER_VIRTUAL_SIZE can have. */
-
-#define MAX_REGISTER_VIRTUAL_SIZE 4
-
-/* Nonzero if register N requires conversion
- from raw format to virtual format. */
+#include "floatformat.h"
-#define REGISTER_CONVERTIBLE(N) 0
+/* Convert data from raw format for register REGNUM in buffer FROM
+ to virtual format with type TYPE in buffer TO. */
-/* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4);
-
-/* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
+do \
+ { \
+ DOUBLEST dbl_tmp_val; \
+ floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \
+ store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val); \
+ } while (0)
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4);
+/* Convert data from virtual format with type TYPE in buffer FROM
+ to raw format for register REGNUM in buffer TO. */
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
+#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
+do \
+ { \
+ DOUBLEST dbl_tmp_val; \
+ dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
+ floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \
+ } while (0)
-#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
+/* Return the GDB type object for the "standard" data type of data
+ in register N. This should be int for D0-D7, 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. */
-#endif /* No 68881. */
+#define REGISTER_VIRTUAL_TYPE(N) \
+ ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \
+ (unsigned) (N) >= FP0_REGNUM ? builtin_type_double : \
+ (unsigned) (N) >= A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \
+ builtin_type_int)
/* Initializer for an array of names of registers.
Entries beyond the first NUM_REGS are ignored. */
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. */
+#define D0_REGNUM 0
+#define A0_REGNUM 8
#define A1_REGNUM 9
#define FP_REGNUM 14 /* Contains address of executing stack frame */
#define SP_REGNUM 15 /* Contains address of top of stack */
#define PS_REGNUM 16 /* Contains processor status */
#define PC_REGNUM 17 /* Contains program counter */
-#if defined (HAVE_68881)
#define FP0_REGNUM 18 /* Floating point register 0 */
#define FPC_REGNUM 26 /* 68881 control register */
#define FPS_REGNUM 27 /* 68881 status register */
#define FPI_REGNUM 28 /* 68881 iaddr register */
-#endif /* 68881. */
/* Store the address of the place in which to copy the structure the
subroutine will return. This is called from call_function. */
#define FRAME_CHAIN(thisframe) \
(thisframe->signal_handler_caller \
? thisframe->frame \
- : (!inside_entry_file ((thisframe)->pc) ? \
- read_memory_integer ((thisframe)->frame, 4) :\
- 0)
+ : (!inside_entry_file ((thisframe)->pc) \
+ ? read_memory_integer ((thisframe)->frame, 4) \
+ : 0))
/* Define other aspects of the stack frame. */
the address we return for it IS the sp for the next frame. */
#if !defined (FRAME_FIND_SAVED_REGS)
-#if defined (HAVE_68881)
-#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
-{ register int regnum; \
- register int regmask; \
- register CORE_ADDR next_addr; \
- register CORE_ADDR pc; \
- int nextinsn; \
- bzero (&frame_saved_regs, sizeof frame_saved_regs); \
- if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
- && (frame_info)->pc <= (frame_info)->frame) \
- { next_addr = (frame_info)->frame; \
- pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
- else \
- { pc = get_pc_function_start ((frame_info)->pc); \
- /* Verify we have a link a6 instruction next; \
- if not we lose. If we win, find the address above the saved \
- regs using the amount of storage from the link instruction. */\
- if (044016 == read_memory_integer (pc, 2)) \
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
- else if (047126 == read_memory_integer (pc, 2)) \
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
- 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; \
- } \
- /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
- regmask = read_memory_integer (pc + 2, 2); \
- /* But before that can come an fmovem. Check for it. */ \
- nextinsn = 0xffff & read_memory_integer (pc, 2); \
- if (0xf227 == nextinsn \
- && (regmask & 0xff00) == 0xe000) \
- { pc += 4; /* Regmask's low bit is for register fp7, the first pushed */ \
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr -= 12); \
- regmask = read_memory_integer (pc + 2, 2); } \
- if (0044327 == read_memory_integer (pc, 2)) \
- { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
- for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \
- else if (0044347 == read_memory_integer (pc, 2)) \
- { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
- for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
- else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \
- { regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \
- (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
- /* fmovemx to index of sp may follow. */ \
- regmask = read_memory_integer (pc + 2, 2); \
- nextinsn = 0xffff & read_memory_integer (pc, 2); \
- if (0xf236 == nextinsn \
- && (regmask & 0xff00) == 0xf000) \
- { pc += 10; /* Regmask's low bit is for register fp0, the first written */ \
- for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr += 12) - 12; \
- regmask = read_memory_integer (pc + 2, 2); } \
- /* clrw -(sp); movw ccr,-(sp) may follow. */ \
- if (0x426742e7 == read_memory_integer (pc, 4)) \
- (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
- lose: ; \
- (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
- (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
- (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
-}
-#else /* no 68881. */
-#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
-{ register int regnum; \
- register int regmask; \
- register CORE_ADDR next_addr; \
- register CORE_ADDR pc; \
- bzero (&frame_saved_regs, sizeof frame_saved_regs); \
- if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \
- && (frame_info)->pc <= (frame_info)->frame) \
- { next_addr = (frame_info)->frame; \
- pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\
- else \
- { pc = get_pc_function_start ((frame_info)->pc); \
- /* Verify we have a link a6 instruction next; \
- if not we lose. If we win, find the address above the saved \
- regs using the amount of storage from the link instruction. */\
- if (044016 == read_memory_integer (pc, 2)) \
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 4), pc+=4; \
- else if (047126 == read_memory_integer (pc, 2)) \
- next_addr = (frame_info)->frame + read_memory_integer (pc += 2, 2), pc+=2; \
- 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; \
- } \
- /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
- regmask = read_memory_integer (pc + 2, 2); \
- if (0044327 == read_memory_integer (pc, 2)) \
- { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
- for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; } \
- else if (0044347 == read_memory_integer (pc, 2)) \
- { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
- for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
- if (regmask & 1) \
- (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
- else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \
- { regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \
- (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
- /* clrw -(sp); movw ccr,-(sp) may follow. */ \
- if (0x426742e7 == read_memory_integer (pc, 4)) \
- (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
- lose: ; \
- (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \
- (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
- (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
-}
-#endif /* no 68881. */
+#define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr))
#endif /* no FIND_FRAME_SAVED_REGS. */
\f
-/* Things needed for making the inferior call functions.
- It seems like every m68k based machine has almost identical definitions
- in the individual machine's configuration files. Most other cpu types
- (mips, i386, etc) have routines in their *-tdep.c files to handle this
- for most configurations. The m68k family should be able to do this as
- well. These macros can still be overridden when necessary. */
+/* Things needed for making the inferior call functions. */
/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
by gdb itself:
+ These instructions exist only so that m68k_find_saved_regs can parse
+ them as a "prologue"; they are never executed.
+
fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
moveml d0-a5,sp@- 0x48e7 0xfffc
clrw sp@- 0x4267
movew ccr,sp@- 0x42e7
- /..* The arguments are pushed at this point by GDB;
- no code is needed in the dummy for this.
- The CALL_DUMMY_START_OFFSET gives the position of
- the following jsr instruction. *../
+ The arguments are pushed at this point by GDB; no code is needed in
+ the dummy for this. The CALL_DUMMY_START_OFFSET gives the position
+ of the following jsr instruction. That is where we start
+ executing.
jsr @#0x32323232 0x4eb9 0x3232 0x3232
addal #0x69696969,sp 0xdffc 0x6969 0x6969
nop 0x4e71
Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
- We actually start executing at the jsr, since the pushing of the
- registers is done by PUSH_DUMMY_FRAME. If this were real code,
- the arguments for the function called by the jsr would be pushed
- between the moveml and the jsr, and we could allow it to execute through.
- But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
- done, and we cannot allow the moveml to push the registers again lest
- they be taken for the arguments. */
-#if defined (HAVE_68881)
+ The dummy frame always saves the floating-point registers, whether they
+ actually exist on this target or not. */
+
+/* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it
+ should be REMOTE_BPT_VECTOR. Best way to fix it would be to define
+ CALL_DUMMY_BREAKPOINT_OFFSET. */
#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
#define CALL_DUMMY_LENGTH 28 /* Size of CALL_DUMMY */
#define CALL_DUMMY_START_OFFSET 12 /* Offset to jsr instruction*/
-
-#else
-
-#define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
-#define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
-#define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/
-
-#endif /* HAVE_68881 */
+#define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12)
/* 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. */
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
-{ _do_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
- _do_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
+{ bfd_putb32 (fun, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
+ bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
/* Push an empty stack frame, to record the current PC, etc. */
/* Offset from SP to first arg on stack at first instruction of a function */
#define SP_ARG0 (1 * 4)
+
+#define TARGET_M68K
projects / binutils.git / blobdiff