diff options
Diffstat (limited to 'gdb/config/m68k/tm-m68k.h')
| -rw-r--r-- | gdb/config/m68k/tm-m68k.h | 129 |
1 files changed, 39 insertions, 90 deletions
diff --git a/gdb/config/m68k/tm-m68k.h b/gdb/config/m68k/tm-m68k.h index 29e45ca..db7b6a4 100644 --- a/gdb/config/m68k/tm-m68k.h +++ b/gdb/config/m68k/tm-m68k.h @@ -17,12 +17,9 @@ 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. */ -/* 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 @@ -91,28 +88,33 @@ read_memory_integer (read_register (SP_REGNUM), 4) #define REGISTER_TYPE long -#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. */ +#define REGISTER_BYTES_SUN3 (16*4 + 8 + 8*12 + 3*4 + 4) +#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) +#define REGISTER_BYTES_NOFP (16*4 + 8) + +#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) +# define REGISTER_BYTES_OK(b) \ + ((b) == REGISTER_BYTES_SUN3 \ + || (b) == REGISTER_BYTES_FP \ + || (b) == REGISTER_BYTES_NOFP) +#else /* Not sun3. */ +# define NUM_REGS 29 +# define REGISTER_BYTES_OK(b) \ + ((b) == REGISTER_BYTES_FP \ + || (b) == REGISTER_BYTES_NOFP) +# define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4) +#endif /* Not sun3. */ /* 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 \ @@ -181,52 +183,6 @@ extern const struct ext_format ext_format_68881; (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. */ - -#define REGISTER_CONVERTIBLE(N) 0 - -/* 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_RAW(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4); - -/* Return the GDB type object for the "standard" data type - of data in register N. */ - -#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int - -#endif /* No 68881. */ - /* Initializer for an array of names of registers. Entries beyond the first NUM_REGS are ignored. */ @@ -249,12 +205,10 @@ extern const struct ext_format ext_format_68881; #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. */ @@ -373,15 +327,18 @@ extern const struct ext_format ext_format_68881; /* 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 @@ -389,28 +346,20 @@ extern const struct ext_format ext_format_68881; 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. We should be using + target_insert_breakpoint (but then I think we need + target_remove_breakpoint somewhere--easiest way to make this happen + is to make this breakpoint a real breakpoint.c type breakpoint). */ #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 */ - /* 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. */ |