1 /* Target-machine dependent code for Zilog Z8000, for GDB.
2 Copyright (C) 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 Contributed by Steve Chamberlain
33 /* Return the saved PC from this frame.
35 If the frame has a memory copy of SRP_REGNUM, use that. If not,
36 just use the register SRP_REGNUM itself. */
39 frame_saved_pc (frame
)
42 return ( read_memory_pointer(frame
->frame
+(BIG
? 4 : 2)));
45 #define IS_PUSHL(x) (BIG ? ((x & 0xfff0) == 0x91e0):((x & 0xfff0) == 0x91F0))
46 #define IS_PUSHW(x) (BIG ? ((x & 0xfff0) == 0x93e0):((x & 0xfff0)==0x93f0))
47 #define IS_MOVE_FP(x) (BIG ? x == 0xa1ea : x == 0xa1fa)
48 #define IS_MOV_SP_FP(x) (BIG ? x == 0x94ea : x == 0x0d76)
49 #define IS_SUB2_SP(x) (x==0x1b87)
50 #define IS_MOVK_R5(x) (x==0x7905)
51 #define IS_SUB_SP(x) ((x & 0xffff) == 0x020f)
52 #define IS_PUSH_FP(x) (BIG ? (x == 0x93ea) : (x == 0x93fa))
55 /* work out how much local space is on the stack and
56 return the pc pointing to the first push */
66 if (IS_PUSH_FP(read_memory_short(pc
))
67 && IS_MOV_SP_FP(read_memory_short(pc
+2)))
69 /* This is a function with an explict frame pointer */
71 *size
+= 2; /* remember the frame pointer */
74 /* remember any stack adjustment */
75 if (IS_SUB_SP(read_memory_short(pc
)))
77 *size
+= read_memory_short(pc
+2);
85 examine_frame(pc
, regs
, sp
)
87 struct frame_saved_regs
*regs
;
90 int w
= read_memory_short(pc
);
96 for (regno
= 0; regno
< NUM_REGS
; regno
++)
97 regs
->regs
[regno
] = 0;
99 while (IS_PUSHW(w
) || IS_PUSHL(w
))
101 /* work out which register is being pushed to where */
104 regs
->regs
[w
& 0xf] = offset
;
105 regs
->regs
[(w
& 0xf) + 1] = offset
+2;
109 regs
->regs
[w
& 0xf] = offset
;
113 w
= read_memory_short(pc
);
121 else if (IS_SUB_SP(w
))
123 /* Subtracting a value from the sp, so were in a function
124 which needs stack space for locals, but has no fp. We fake up
125 the values as if we had an fp */
126 regs
->regs
[FP_REGNUM
] = sp
;
130 /* This one didn't have an fp, we'll fake it up */
131 regs
->regs
[SP_REGNUM
] = sp
;
133 /* stack pointer contains address of next frame */
134 /* regs->regs[fp_regnum()] = fp;*/
135 regs
->regs
[SP_REGNUM
] = sp
;
139 CORE_ADDR
z8k_skip_prologue(start_pc
)
142 struct frame_saved_regs dummy
;
143 return examine_frame(start_pc
, &dummy
, 0);
146 CORE_ADDR
addr_bits_remove(x
)
152 read_memory_pointer(x
)
156 return read_memory_integer(ADDR_BITS_REMOVE(x
), BIG
? 4 : 2);
160 frame_chain (thisframe
)
163 if (thisframe
->prev
== 0)
165 /* This is the top of the stack, let's get the sp for real */
167 if (!inside_entry_file ((thisframe
)->pc
))
169 return read_memory_pointer ((thisframe
)->frame
);
175 init_frame_pc() { abort(); }
177 /* Put here the code to store, into a struct frame_saved_regs,
178 the addresses of the saved registers of frame described by FRAME_INFO.
179 This includes special registers such as pc and fp saved in special
180 ways in the stack frame. sp is even more special:
181 the address we return for it IS the sp for the next frame. */
183 void get_frame_saved_regs(frame_info
, frame_saved_regs
)
184 struct frame_info
*frame_info
;
185 struct frame_saved_regs
*frame_saved_regs
;
190 bzero(frame_saved_regs
, sizeof(*frame_saved_regs
));
191 pc
= get_pc_function_start(frame_info
->pc
);
193 /* wander down the instruction stream */
194 examine_frame(pc
, frame_saved_regs
, frame_info
->frame
);
199 extract_return_value(valtype
, regbuf
, valbuf
)
200 struct type
*valtype
;
201 char regbuf
[REGISTER_BYTES
];
204 bcopy(regbuf
+ REGISTER_BYTE(2), valbuf
, TYPE_LENGTH(valtype
));
206 void z8k_push_dummy_frame() { abort(); }
208 int print_insn(memaddr
, stream
)
213 read_memory (memaddr
, temp
, 20);
215 return print_insn_z8001(memaddr
, temp
, stream
);
218 return print_insn_z8002(memaddr
, temp
, stream
);
228 store_struct_return() { abort(); }
232 /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
233 is not the address of a valid instruction, the address of the next
234 instruction beyond ADDR otherwise. *PWORD1 receives the first word
235 of the instruction.*/
239 NEXT_PROLOGUE_INSN(addr
, lim
, pword1
)
246 read_memory (addr
, pword1
, sizeof(*pword1
));
247 SWAP_TARGET_AND_HOST (pword1
, sizeof (short));
256 /* Put here the code to store, into a struct frame_saved_regs,
257 the addresses of the saved registers of frame described by FRAME_INFO.
258 This includes special registers such as pc and fp saved in special
259 ways in the stack frame. sp is even more special:
260 the address we return for it IS the sp for the next frame.
262 We cache the result of doing this in the frame_cache_obstack, since
263 it is fairly expensive. */
266 frame_find_saved_regs (fip
, fsrp
)
267 struct frame_info
*fip
;
268 struct frame_saved_regs
*fsrp
;
275 memset (fsrp
, 0, sizeof *fsrp
);
277 pc
= skip_adjust(get_pc_function_start (fip
->pc
), &locals
);
280 adr
= fip
->frame
- locals
;
281 for (i
= 0; i
< 8; i
++)
283 int word
= read_memory_short(pc
);
285 if (IS_PUSHL(word
)) {
286 fsrp
->regs
[word
& 0xf] = adr
;
287 fsrp
->regs
[(word
& 0xf) + 1] = adr
- 2;
290 else if (IS_PUSHW(word
)) {
291 fsrp
->regs
[word
& 0xf] = adr
;
300 fsrp
->regs
[PC_REGNUM
] = fip
->frame
+ 4;
301 fsrp
->regs
[FP_REGNUM
] = fip
->frame
;
306 addr_bits_set() { abort(); }
309 saved_pc_after_call()
311 return addr_bits_remove(read_memory_integer(read_register(SP_REGNUM
), PTR_SIZE
));
315 print_register_hook(regno
)
319 if ((regno
& 1)==0 && regno
< 16)
322 read_relative_register_raw_bytes(regno
, (char *)(l
+0));
323 read_relative_register_raw_bytes(regno
+1, (char *)(l
+1));
325 printf("%04x%04x", l
[0],l
[1]);
328 if ((regno
& 3)== 0 && regno
< 16)
331 read_relative_register_raw_bytes(regno
, l
+0);
332 read_relative_register_raw_bytes(regno
+1, l
+1);
333 read_relative_register_raw_bytes(regno
+2, l
+2);
334 read_relative_register_raw_bytes(regno
+3, l
+3);
337 printf("%04x%04x%04x%04x", l
[0],l
[1],l
[2],l
[3]);
343 read_relative_register_raw_bytes(regno
, (char *)(&rval
));
346 for (i
= 0; i
< 10; i
+=2) {
347 printf("(sp+%d=%04x)",i
, read_memory_short(rval
+i
));
355 register_convert_to_virtual(regnum
, from
, to
)
366 register_convert_to_raw(regnum
, to
, from
)
378 void z8k_pop_frame() { }
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