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dd3b648e | 1 | /* Definitions to make GDB run on a mips box under 4.3bsd. |
30875e1c | 2 | Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. |
fbcb5095 JG |
3 | Contributed by Per Bothner (bothner@cs.wisc.edu) at U.Wisconsin |
4 | and by Alessandro Forin (af@cs.cmu.edu) at CMU. | |
dd3b648e RP |
5 | |
6 | This file is part of GDB. | |
7 | ||
99a7de40 | 8 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 9 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
10 | the Free Software Foundation; either version 2 of the License, or |
11 | (at your option) any later version. | |
dd3b648e | 12 | |
99a7de40 | 13 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
19 | along with this program; if not, write to the Free Software |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
21 | |
22 | #if !defined (TARGET_BYTE_ORDER) | |
23 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
24 | #endif | |
25 | ||
26 | /* Floating point is IEEE compliant */ | |
27 | #define IEEE_FLOAT | |
28 | ||
29 | /* Define this if the C compiler puts an underscore at the front | |
30 | of external names before giving them to the linker. */ | |
31 | ||
32 | /*#define NAMES_HAVE_UNDERSCORE*/ | |
33 | ||
34 | /* Debugger information will be in mips' format */ | |
35 | ||
36 | #define READ_MIPS_FORMAT | |
37 | ||
38 | /* File format is coff, but with additions */ | |
39 | ||
40 | #define COFF_FORMAT | |
41 | ||
42 | /* Offset from address of function to start of its code. | |
43 | Zero on most machines. */ | |
44 | ||
45 | #define FUNCTION_START_OFFSET 0 | |
46 | ||
47 | /* Advance PC across any function entry prologue instructions | |
48 | to reach some "real" code. */ | |
49 | ||
50 | #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc) | |
51 | ||
52 | /* Immediately after a function call, return the saved pc. | |
53 | Can't always go through the frames for this because on some machines | |
54 | the new frame is not set up until the new function executes | |
55 | some instructions. */ | |
56 | ||
57 | #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM) | |
58 | ||
59 | /* Are we currently handling a signal */ | |
60 | ||
61 | #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name) | |
62 | ||
63 | /* Address of end of stack space. */ | |
64 | ||
65 | #define STACK_END_ADDR (0x7ffff000) | |
66 | ||
67 | /* Stack grows downward. */ | |
68 | ||
69 | #define INNER_THAN < | |
70 | ||
71 | #define BIG_ENDIAN 4321 | |
72 | #if TARGET_BYTE_ORDER == BIG_ENDIAN | |
73 | #define BREAKPOINT {0, 0x5, 0, 0xd} | |
74 | #else | |
75 | #define BREAKPOINT {0xd, 0, 0x5, 0} | |
76 | #endif | |
77 | ||
78 | /* Amount PC must be decremented by after a breakpoint. | |
79 | This is often the number of bytes in BREAKPOINT | |
80 | but not always. */ | |
81 | ||
82 | #define DECR_PC_AFTER_BREAK 0 | |
83 | ||
84 | /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */ | |
85 | ||
86 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008) | |
87 | ||
88 | /* Return 1 if P points to an invalid floating point value. */ | |
89 | ||
90 | #define INVALID_FLOAT(p,l) isa_NAN(p,l) | |
91 | ||
92 | /* Say how long (all) registers are. */ | |
93 | ||
94 | #define REGISTER_TYPE long | |
95 | ||
96 | /* Number of machine registers */ | |
97 | ||
98 | #define NUM_REGS 73 | |
99 | ||
100 | /* Initializer for an array of names of registers. | |
101 | There should be NUM_REGS strings in this initializer. */ | |
102 | ||
103 | #define REGISTER_NAMES \ | |
104 | { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \ | |
105 | "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \ | |
106 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \ | |
107 | "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \ | |
108 | "sr", "lo", "hi", "bad", "cause","pc", \ | |
109 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ | |
110 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ | |
111 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\ | |
112 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\ | |
113 | "fsr", "fir", "fp" \ | |
114 | } | |
115 | ||
116 | /* Register numbers of various important registers. | |
117 | Note that some of these values are "real" register numbers, | |
118 | and correspond to the general registers of the machine, | |
119 | and some are "phony" register numbers which are too large | |
120 | to be actual register numbers as far as the user is concerned | |
121 | but do serve to get the desired values when passed to read_register. */ | |
122 | ||
abefb1f1 | 123 | #define ZERO_REGNUM 0 /* read-only register, always 0 */ |
30875e1c | 124 | #define A0_REGNUM 4 /* Lo of first arg during a subr call */ |
dd3b648e | 125 | #define SP_REGNUM 29 /* Contains address of top of stack */ |
dd3b648e RP |
126 | #define RA_REGNUM 31 /* Contains return address value */ |
127 | #define PS_REGNUM 32 /* Contains processor status */ | |
128 | #define HI_REGNUM 34 /* Multiple/divide temp */ | |
129 | #define LO_REGNUM 33 /* ... */ | |
abefb1f1 PB |
130 | #define BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */ |
131 | #define CAUSE_REGNUM 36 /* describes last exception */ | |
132 | #define PC_REGNUM 37 /* Contains program counter */ | |
dd3b648e RP |
133 | #define FP0_REGNUM 38 /* Floating point register 0 (single float) */ |
134 | #define FCRCS_REGNUM 70 /* FP control/status */ | |
135 | #define FCRIR_REGNUM 71 /* FP implementation/revision */ | |
136 | #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */ | |
137 | ||
138 | /* Define DO_REGISTERS_INFO() to do machine-specific formatting | |
139 | of register dumps. */ | |
140 | ||
361bf6ee | 141 | #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp) |
dd3b648e | 142 | |
dd3b648e RP |
143 | /* Total amount of space needed to store our copies of the machine's |
144 | register state, the array `registers'. */ | |
145 | #define REGISTER_BYTES (NUM_REGS*4) | |
146 | ||
147 | /* Index within `registers' of the first byte of the space for | |
148 | register N. */ | |
149 | ||
150 | #define REGISTER_BYTE(N) ((N) * 4) | |
151 | ||
152 | /* Number of bytes of storage in the actual machine representation | |
153 | for register N. On mips, all regs are 4 bytes. */ | |
154 | ||
155 | #define REGISTER_RAW_SIZE(N) 4 | |
156 | ||
157 | /* Number of bytes of storage in the program's representation | |
158 | for register N. On mips, all regs are 4 bytes. */ | |
159 | ||
160 | #define REGISTER_VIRTUAL_SIZE(N) 4 | |
161 | ||
162 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
163 | ||
164 | #define MAX_REGISTER_RAW_SIZE 4 | |
165 | ||
166 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
167 | ||
168 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
169 | ||
170 | /* Nonzero if register N requires conversion | |
171 | from raw format to virtual format. */ | |
172 | ||
173 | #define REGISTER_CONVERTIBLE(N) 0 | |
174 | ||
175 | /* Convert data from raw format for register REGNUM | |
176 | to virtual format for register REGNUM. */ | |
177 | ||
178 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ | |
179 | bcopy ((FROM), (TO), 4); | |
180 | ||
181 | /* Convert data from virtual format for register REGNUM | |
182 | to raw format for register REGNUM. */ | |
183 | ||
184 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
185 | bcopy ((FROM), (TO), 4); | |
186 | ||
187 | /* Return the GDB type object for the "standard" data type | |
188 | of data in register N. */ | |
189 | ||
190 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int | |
191 | /* Store the address of the place in which to copy the structure the | |
192 | subroutine will return. This is called from call_function. */ | |
193 | ||
194 | #define STORE_STRUCT_RETURN(addr, sp) \ | |
195 | { sp = push_word(sp, addr);} | |
196 | ||
197 | /* Extract from an array REGBUF containing the (raw) register state | |
198 | a function return value of type TYPE, and copy that, in virtual format, | |
199 | into VALBUF. XXX floats */ | |
200 | ||
201 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
202 | bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE)) | |
203 | ||
204 | /* Write into appropriate registers a function return value | |
205 | of type TYPE, given in virtual format. */ | |
206 | ||
207 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
208 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE)) | |
209 | ||
210 | /* Extract from an array REGBUF containing the (raw) register state | |
211 | the address in which a function should return its structure value, | |
212 | as a CORE_ADDR (or an expression that can be used as one). */ | |
213 | ||
214 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16)) | |
215 | ||
216 | /* Structures are returned by ref in extra arg0 */ | |
217 | #define USE_STRUCT_CONVENTION(gcc_p, type) 1 | |
218 | ||
219 | \f | |
220 | /* Describe the pointer in each stack frame to the previous stack frame | |
221 | (its caller). */ | |
222 | ||
223 | /* FRAME_CHAIN takes a frame's nominal address | |
224 | and produces the frame's chain-pointer. | |
225 | ||
dd3b648e | 226 | However, if FRAME_CHAIN_VALID returns zero, |
e140f1da | 227 | it means the given frame is the outermost one and has no caller. */ |
dd3b648e RP |
228 | |
229 | #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe) | |
230 | ||
231 | #define FRAME_CHAIN_VALID(chain, thisframe) \ | |
232 | (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe)))) | |
233 | ||
dd3b648e RP |
234 | /* Define other aspects of the stack frame. */ |
235 | ||
236 | ||
237 | /* A macro that tells us whether the function invocation represented | |
238 | by FI does not have a frame on the stack associated with it. If it | |
239 | does not, FRAMELESS is set to 1, else 0. */ | |
240 | /* We handle this differently for mips, and maybe we should not */ | |
241 | ||
242 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;} | |
243 | ||
244 | /* Saved Pc. */ | |
245 | ||
246 | #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME)) | |
247 | ||
248 | #define FRAME_ARGS_ADDRESS(fi) (fi)->frame | |
249 | ||
250 | #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame | |
251 | ||
252 | /* Return number of args passed to a frame. | |
253 | Can return -1, meaning no way to tell. */ | |
254 | ||
255 | #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi)) | |
256 | ||
257 | /* Return number of bytes at start of arglist that are not really args. */ | |
258 | ||
259 | #define FRAME_ARGS_SKIP 0 | |
260 | ||
261 | /* Put here the code to store, into a struct frame_saved_regs, | |
262 | the addresses of the saved registers of frame described by FRAME_INFO. | |
263 | This includes special registers such as pc and fp saved in special | |
264 | ways in the stack frame. sp is even more special: | |
265 | the address we return for it IS the sp for the next frame. */ | |
266 | ||
267 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \ | |
268 | (frame_saved_regs) = *(frame_info)->saved_regs, \ | |
269 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame) | |
270 | ||
271 | \f | |
272 | /* Things needed for making the inferior call functions. */ | |
273 | ||
274 | /* Stack has strict alignment. However, use PUSH_ARGUMENTS | |
275 | to take care of it. */ | |
276 | /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/ | |
277 | ||
278 | #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ | |
279 | sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr) | |
280 | ||
281 | /* Push an empty stack frame, to record the current PC, etc. */ | |
282 | ||
283 | #define PUSH_DUMMY_FRAME mips_push_dummy_frame() | |
284 | ||
285 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
286 | ||
287 | #define POP_FRAME mips_pop_frame() | |
288 | ||
289 | #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset)) | |
290 | #define CALL_DUMMY_SIZE (16*4) | |
291 | #define Dest_Reg 2 | |
292 | #define CALL_DUMMY {\ | |
293 | MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\ | |
294 | 0, /* nop # ... to stop raw backtrace*/\ | |
295 | 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\ | |
296 | /* Start here: */\ | |
297 | MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\ | |
298 | MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\ | |
299 | MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\ | |
300 | MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\ | |
301 | MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\ | |
302 | MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\ | |
303 | MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\ | |
304 | MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\ | |
305 | (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\ | |
306 | MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \ | |
307 | (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\ | |
308 | MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\ | |
309 | 0x5000d, /* bpt */\ | |
310 | } | |
311 | ||
312 | #define CALL_DUMMY_START_OFFSET 12 | |
313 | ||
314 | /* Insert the specified number of args and function address | |
315 | into a call sequence of the above form stored at DUMMYNAME. */ | |
316 | ||
317 | #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\ | |
318 | (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \ | |
319 | ((int*)dummyname)[12] |= (unsigned short)(fun)) | |
320 | ||
321 | /* Specific information about a procedure. | |
322 | This overlays the MIPS's PDR records, | |
323 | mipsread.c (ab)uses this to save memory */ | |
324 | ||
325 | typedef struct mips_extra_func_info { | |
326 | unsigned long adr; /* memory address of start of procedure */ | |
327 | long isym; /* pointer to procedure symbol */ | |
328 | long pad2; /* iline: start of line number entries*/ | |
329 | long regmask; /* save register mask */ | |
330 | long regoffset; /* save register offset */ | |
331 | long numargs; /* number of args to procedure (was iopt) */ | |
332 | long fregmask; /* save floating point register mask */ | |
333 | long fregoffset; /* save floating point register offset */ | |
334 | long framesize; /* frameoffset: frame size */ | |
335 | short framereg; /* frame pointer register */ | |
336 | short pcreg; /* offset or reg of return pc */ | |
337 | long lnLow; /* lowest line in the procedure */ | |
338 | long lnHigh; /* highest line in the procedure */ | |
339 | long pad3; /* cbLineOffset: byte offset for this procedure from the fd base */ | |
340 | } *mips_extra_func_info_t; | |
341 | ||
342 | #define EXTRA_FRAME_INFO \ | |
343 | char *proc_desc; /* actually, a mips_extra_func_info_t */\ | |
344 | int num_args;\ | |
345 | struct frame_saved_regs *saved_regs; | |
346 | ||
a23075bc | 347 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci) |
bd49ef36 PB |
348 | |
349 | #define STAB_REG_TO_REGNUM(num) ((num) < 32 ? (num) : (num)+FP0_REGNUM-32) | |
30875e1c SG |
350 | |
351 | /* Size of elements in jmpbuf */ | |
352 | ||
353 | #define JB_ELEMENT_SIZE 4 | |
354 | ||
355 | /* Figure out where the longjmp will land. We expect that we have just entered | |
356 | longjmp and haven't yet setup the stack frame, so the args are still in the | |
357 | argument regs. a0 (CALL_ARG0) points at the jmp_buf structure from which we | |
358 | extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. | |
359 | This routine returns true on success */ | |
360 | ||
361 | /* Note that caller must #include <setjmp.h> in order to get def of JB_* */ | |
362 | #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR) |