Commit | Line | Data |
---|---|---|
7fb623f7 AC |
1 | // OBSOLETE /* Target-machine dependent code for Motorola 88000 series, for GDB. |
2 | // OBSOLETE | |
3 | // OBSOLETE Copyright 1988, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, | |
4 | // OBSOLETE 2000, 2001, 2002 Free Software Foundation, Inc. | |
5 | // OBSOLETE | |
6 | // OBSOLETE This file is part of GDB. | |
7 | // OBSOLETE | |
8 | // OBSOLETE This program is free software; you can redistribute it and/or modify | |
9 | // OBSOLETE it under the terms of the GNU General Public License as published by | |
10 | // OBSOLETE the Free Software Foundation; either version 2 of the License, or | |
11 | // OBSOLETE (at your option) any later version. | |
12 | // OBSOLETE | |
13 | // OBSOLETE This program is distributed in the hope that it will be useful, | |
14 | // OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // OBSOLETE GNU General Public License for more details. | |
17 | // OBSOLETE | |
18 | // OBSOLETE You should have received a copy of the GNU General Public License | |
19 | // OBSOLETE along with this program; if not, write to the Free Software | |
20 | // OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | // OBSOLETE Boston, MA 02111-1307, USA. */ | |
22 | // OBSOLETE | |
23 | // OBSOLETE #include "defs.h" | |
24 | // OBSOLETE #include "frame.h" | |
25 | // OBSOLETE #include "inferior.h" | |
26 | // OBSOLETE #include "value.h" | |
27 | // OBSOLETE #include "gdbcore.h" | |
28 | // OBSOLETE #include "symtab.h" | |
29 | // OBSOLETE #include "setjmp.h" | |
30 | // OBSOLETE #include "value.h" | |
31 | // OBSOLETE #include "regcache.h" | |
32 | // OBSOLETE | |
33 | // OBSOLETE /* Size of an instruction */ | |
34 | // OBSOLETE #define BYTES_PER_88K_INSN 4 | |
35 | // OBSOLETE | |
36 | // OBSOLETE void frame_find_saved_regs (); | |
37 | // OBSOLETE | |
38 | // OBSOLETE /* Is this target an m88110? Otherwise assume m88100. This has | |
39 | // OBSOLETE relevance for the ways in which we screw with instruction pointers. */ | |
40 | // OBSOLETE | |
41 | // OBSOLETE int target_is_m88110 = 0; | |
42 | // OBSOLETE | |
43 | // OBSOLETE void | |
44 | // OBSOLETE m88k_target_write_pc (CORE_ADDR pc, ptid_t ptid) | |
45 | // OBSOLETE { | |
46 | // OBSOLETE /* According to the MC88100 RISC Microprocessor User's Manual, | |
47 | // OBSOLETE section 6.4.3.1.2: | |
48 | // OBSOLETE | |
49 | // OBSOLETE ... can be made to return to a particular instruction by placing | |
50 | // OBSOLETE a valid instruction address in the SNIP and the next sequential | |
51 | // OBSOLETE instruction address in the SFIP (with V bits set and E bits | |
52 | // OBSOLETE clear). The rte resumes execution at the instruction pointed to | |
53 | // OBSOLETE by the SNIP, then the SFIP. | |
54 | // OBSOLETE | |
55 | // OBSOLETE The E bit is the least significant bit (bit 0). The V (valid) | |
56 | // OBSOLETE bit is bit 1. This is why we logical or 2 into the values we are | |
57 | // OBSOLETE writing below. It turns out that SXIP plays no role when | |
58 | // OBSOLETE returning from an exception so nothing special has to be done | |
59 | // OBSOLETE with it. We could even (presumably) give it a totally bogus | |
60 | // OBSOLETE value. | |
61 | // OBSOLETE | |
62 | // OBSOLETE -- Kevin Buettner */ | |
63 | // OBSOLETE | |
64 | // OBSOLETE write_register_pid (SXIP_REGNUM, pc, ptid); | |
65 | // OBSOLETE write_register_pid (SNIP_REGNUM, (pc | 2), ptid); | |
66 | // OBSOLETE write_register_pid (SFIP_REGNUM, (pc | 2) + 4, ptid); | |
67 | // OBSOLETE } | |
68 | // OBSOLETE | |
69 | // OBSOLETE /* The type of a register. */ | |
70 | // OBSOLETE struct type * | |
71 | // OBSOLETE m88k_register_type (int regnum) | |
72 | // OBSOLETE { | |
73 | // OBSOLETE if (regnum >= XFP_REGNUM) | |
74 | // OBSOLETE return builtin_type_m88110_ext; | |
75 | // OBSOLETE else if (regnum == PC_REGNUM || regnum == FP_REGNUM || regnum == SP_REGNUM) | |
76 | // OBSOLETE return builtin_type_void_func_ptr; | |
77 | // OBSOLETE else | |
78 | // OBSOLETE return builtin_type_int32; | |
79 | // OBSOLETE } | |
80 | // OBSOLETE | |
81 | // OBSOLETE | |
82 | // OBSOLETE /* The m88k kernel aligns all instructions on 4-byte boundaries. The | |
83 | // OBSOLETE kernel also uses the least significant two bits for its own hocus | |
84 | // OBSOLETE pocus. When gdb receives an address from the kernel, it needs to | |
85 | // OBSOLETE preserve those right-most two bits, but gdb also needs to be careful | |
86 | // OBSOLETE to realize that those two bits are not really a part of the address | |
87 | // OBSOLETE of an instruction. Shrug. */ | |
88 | // OBSOLETE | |
89 | // OBSOLETE CORE_ADDR | |
90 | // OBSOLETE m88k_addr_bits_remove (CORE_ADDR addr) | |
91 | // OBSOLETE { | |
92 | // OBSOLETE return ((addr) & ~3); | |
93 | // OBSOLETE } | |
94 | // OBSOLETE | |
95 | // OBSOLETE | |
96 | // OBSOLETE /* Given a GDB frame, determine the address of the calling function's frame. | |
97 | // OBSOLETE This will be used to create a new GDB frame struct, and then | |
98 | // OBSOLETE INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. | |
99 | // OBSOLETE | |
100 | // OBSOLETE For us, the frame address is its stack pointer value, so we look up | |
101 | // OBSOLETE the function prologue to determine the caller's sp value, and return it. */ | |
102 | // OBSOLETE | |
103 | // OBSOLETE CORE_ADDR | |
104 | // OBSOLETE frame_chain (struct frame_info *thisframe) | |
105 | // OBSOLETE { | |
106 | // OBSOLETE | |
107 | // OBSOLETE frame_find_saved_regs (thisframe, (struct frame_saved_regs *) 0); | |
108 | // OBSOLETE /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not | |
109 | // OBSOLETE the ADDRESS, of SP_REGNUM. It also depends on the cache of | |
110 | // OBSOLETE frame_find_saved_regs results. */ | |
111 | // OBSOLETE if (thisframe->fsr->regs[SP_REGNUM]) | |
112 | // OBSOLETE return thisframe->fsr->regs[SP_REGNUM]; | |
113 | // OBSOLETE else | |
114 | // OBSOLETE return thisframe->frame; /* Leaf fn -- next frame up has same SP. */ | |
115 | // OBSOLETE } | |
116 | // OBSOLETE | |
117 | // OBSOLETE int | |
118 | // OBSOLETE frameless_function_invocation (struct frame_info *frame) | |
119 | // OBSOLETE { | |
120 | // OBSOLETE | |
121 | // OBSOLETE frame_find_saved_regs (frame, (struct frame_saved_regs *) 0); | |
122 | // OBSOLETE /* NOTE: this depends on frame_find_saved_regs returning the VALUE, not | |
123 | // OBSOLETE the ADDRESS, of SP_REGNUM. It also depends on the cache of | |
124 | // OBSOLETE frame_find_saved_regs results. */ | |
125 | // OBSOLETE if (frame->fsr->regs[SP_REGNUM]) | |
126 | // OBSOLETE return 0; /* Frameful -- return addr saved somewhere */ | |
127 | // OBSOLETE else | |
128 | // OBSOLETE return 1; /* Frameless -- no saved return address */ | |
129 | // OBSOLETE } | |
130 | // OBSOLETE | |
131 | // OBSOLETE void | |
132 | // OBSOLETE init_extra_frame_info (int fromleaf, struct frame_info *frame) | |
133 | // OBSOLETE { | |
134 | // OBSOLETE frame->fsr = 0; /* Not yet allocated */ | |
135 | // OBSOLETE frame->args_pointer = 0; /* Unknown */ | |
136 | // OBSOLETE frame->locals_pointer = 0; /* Unknown */ | |
137 | // OBSOLETE } | |
138 | // OBSOLETE \f | |
139 | // OBSOLETE /* Examine an m88k function prologue, recording the addresses at which | |
140 | // OBSOLETE registers are saved explicitly by the prologue code, and returning | |
141 | // OBSOLETE the address of the first instruction after the prologue (but not | |
142 | // OBSOLETE after the instruction at address LIMIT, as explained below). | |
143 | // OBSOLETE | |
144 | // OBSOLETE LIMIT places an upper bound on addresses of the instructions to be | |
145 | // OBSOLETE examined. If the prologue code scan reaches LIMIT, the scan is | |
146 | // OBSOLETE aborted and LIMIT is returned. This is used, when examining the | |
147 | // OBSOLETE prologue for the current frame, to keep examine_prologue () from | |
148 | // OBSOLETE claiming that a given register has been saved when in fact the | |
149 | // OBSOLETE instruction that saves it has not yet been executed. LIMIT is used | |
150 | // OBSOLETE at other times to stop the scan when we hit code after the true | |
151 | // OBSOLETE function prologue (e.g. for the first source line) which might | |
152 | // OBSOLETE otherwise be mistaken for function prologue. | |
153 | // OBSOLETE | |
154 | // OBSOLETE The format of the function prologue matched by this routine is | |
155 | // OBSOLETE derived from examination of the source to gcc 1.95, particularly | |
156 | // OBSOLETE the routine output_prologue () in config/out-m88k.c. | |
157 | // OBSOLETE | |
158 | // OBSOLETE subu r31,r31,n # stack pointer update | |
159 | // OBSOLETE | |
160 | // OBSOLETE (st rn,r31,offset)? # save incoming regs | |
161 | // OBSOLETE (st.d rn,r31,offset)? | |
162 | // OBSOLETE | |
163 | // OBSOLETE (addu r30,r31,n)? # frame pointer update | |
164 | // OBSOLETE | |
165 | // OBSOLETE (pic sequence)? # PIC code prologue | |
166 | // OBSOLETE | |
167 | // OBSOLETE (or rn,rm,0)? # Move parameters to other regs | |
168 | // OBSOLETE */ | |
169 | // OBSOLETE | |
170 | // OBSOLETE /* Macros for extracting fields from instructions. */ | |
171 | // OBSOLETE | |
172 | // OBSOLETE #define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos)) | |
173 | // OBSOLETE #define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width)) | |
174 | // OBSOLETE #define SUBU_OFFSET(x) ((unsigned)(x & 0xFFFF)) | |
175 | // OBSOLETE #define ST_OFFSET(x) ((unsigned)((x) & 0xFFFF)) | |
176 | // OBSOLETE #define ST_SRC(x) EXTRACT_FIELD ((x), 21, 5) | |
177 | // OBSOLETE #define ADDU_OFFSET(x) ((unsigned)(x & 0xFFFF)) | |
178 | // OBSOLETE | |
179 | // OBSOLETE /* | |
180 | // OBSOLETE * prologue_insn_tbl is a table of instructions which may comprise a | |
181 | // OBSOLETE * function prologue. Associated with each table entry (corresponding | |
182 | // OBSOLETE * to a single instruction or group of instructions), is an action. | |
183 | // OBSOLETE * This action is used by examine_prologue (below) to determine | |
184 | // OBSOLETE * the state of certain machine registers and where the stack frame lives. | |
185 | // OBSOLETE */ | |
186 | // OBSOLETE | |
187 | // OBSOLETE enum prologue_insn_action | |
188 | // OBSOLETE { | |
189 | // OBSOLETE PIA_SKIP, /* don't care what the instruction does */ | |
190 | // OBSOLETE PIA_NOTE_ST, /* note register stored and where */ | |
191 | // OBSOLETE PIA_NOTE_STD, /* note pair of registers stored and where */ | |
192 | // OBSOLETE PIA_NOTE_SP_ADJUSTMENT, /* note stack pointer adjustment */ | |
193 | // OBSOLETE PIA_NOTE_FP_ASSIGNMENT, /* note frame pointer assignment */ | |
194 | // OBSOLETE PIA_NOTE_PROLOGUE_END, /* no more prologue */ | |
195 | // OBSOLETE }; | |
196 | // OBSOLETE | |
197 | // OBSOLETE struct prologue_insns | |
198 | // OBSOLETE { | |
199 | // OBSOLETE unsigned long insn; | |
200 | // OBSOLETE unsigned long mask; | |
201 | // OBSOLETE enum prologue_insn_action action; | |
202 | // OBSOLETE }; | |
203 | // OBSOLETE | |
204 | // OBSOLETE struct prologue_insns prologue_insn_tbl[] = | |
205 | // OBSOLETE { | |
206 | // OBSOLETE /* Various register move instructions */ | |
207 | // OBSOLETE {0x58000000, 0xf800ffff, PIA_SKIP}, /* or/or.u with immed of 0 */ | |
208 | // OBSOLETE {0xf4005800, 0xfc1fffe0, PIA_SKIP}, /* or rd, r0, rs */ | |
209 | // OBSOLETE {0xf4005800, 0xfc00ffff, PIA_SKIP}, /* or rd, rs, r0 */ | |
210 | // OBSOLETE | |
211 | // OBSOLETE /* Stack pointer setup: "subu sp, sp, n" where n is a multiple of 8 */ | |
212 | // OBSOLETE {0x67ff0000, 0xffff0007, PIA_NOTE_SP_ADJUSTMENT}, | |
213 | // OBSOLETE | |
214 | // OBSOLETE /* Frame pointer assignment: "addu r30, r31, n" */ | |
215 | // OBSOLETE {0x63df0000, 0xffff0000, PIA_NOTE_FP_ASSIGNMENT}, | |
216 | // OBSOLETE | |
217 | // OBSOLETE /* Store to stack instructions; either "st rx, sp, n" or "st.d rx, sp, n" */ | |
218 | // OBSOLETE {0x241f0000, 0xfc1f0000, PIA_NOTE_ST}, /* st rx, sp, n */ | |
219 | // OBSOLETE {0x201f0000, 0xfc1f0000, PIA_NOTE_STD}, /* st.d rs, sp, n */ | |
220 | // OBSOLETE | |
221 | // OBSOLETE /* Instructions needed for setting up r25 for pic code. */ | |
222 | // OBSOLETE {0x5f200000, 0xffff0000, PIA_SKIP}, /* or.u r25, r0, offset_high */ | |
223 | // OBSOLETE {0xcc000002, 0xffffffff, PIA_SKIP}, /* bsr.n Lab */ | |
224 | // OBSOLETE {0x5b390000, 0xffff0000, PIA_SKIP}, /* or r25, r25, offset_low */ | |
225 | // OBSOLETE {0xf7396001, 0xffffffff, PIA_SKIP}, /* Lab: addu r25, r25, r1 */ | |
226 | // OBSOLETE | |
227 | // OBSOLETE /* Various branch or jump instructions which have a delay slot -- these | |
228 | // OBSOLETE do not form part of the prologue, but the instruction in the delay | |
229 | // OBSOLETE slot might be a store instruction which should be noted. */ | |
230 | // OBSOLETE {0xc4000000, 0xe4000000, PIA_NOTE_PROLOGUE_END}, | |
231 | // OBSOLETE /* br.n, bsr.n, bb0.n, or bb1.n */ | |
232 | // OBSOLETE {0xec000000, 0xfc000000, PIA_NOTE_PROLOGUE_END}, /* bcnd.n */ | |
233 | // OBSOLETE {0xf400c400, 0xfffff7e0, PIA_NOTE_PROLOGUE_END} /* jmp.n or jsr.n */ | |
234 | // OBSOLETE | |
235 | // OBSOLETE }; | |
236 | // OBSOLETE | |
237 | // OBSOLETE | |
238 | // OBSOLETE /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or | |
239 | // OBSOLETE is not the address of a valid instruction, the address of the next | |
240 | // OBSOLETE instruction beyond ADDR otherwise. *PWORD1 receives the first word | |
241 | // OBSOLETE of the instruction. */ | |
242 | // OBSOLETE | |
243 | // OBSOLETE #define NEXT_PROLOGUE_INSN(addr, lim, pword1) \ | |
244 | // OBSOLETE (((addr) < (lim)) ? next_insn (addr, pword1) : 0) | |
245 | // OBSOLETE | |
246 | // OBSOLETE /* Read the m88k instruction at 'memaddr' and return the address of | |
247 | // OBSOLETE the next instruction after that, or 0 if 'memaddr' is not the | |
248 | // OBSOLETE address of a valid instruction. The instruction | |
249 | // OBSOLETE is stored at 'pword1'. */ | |
250 | // OBSOLETE | |
251 | // OBSOLETE CORE_ADDR | |
252 | // OBSOLETE next_insn (CORE_ADDR memaddr, unsigned long *pword1) | |
253 | // OBSOLETE { | |
254 | // OBSOLETE *pword1 = read_memory_integer (memaddr, BYTES_PER_88K_INSN); | |
255 | // OBSOLETE return memaddr + BYTES_PER_88K_INSN; | |
256 | // OBSOLETE } | |
257 | // OBSOLETE | |
258 | // OBSOLETE /* Read a register from frames called by us (or from the hardware regs). */ | |
259 | // OBSOLETE | |
260 | // OBSOLETE static int | |
261 | // OBSOLETE read_next_frame_reg (struct frame_info *frame, int regno) | |
262 | // OBSOLETE { | |
263 | // OBSOLETE for (; frame; frame = frame->next) | |
264 | // OBSOLETE { | |
265 | // OBSOLETE if (regno == SP_REGNUM) | |
266 | // OBSOLETE return FRAME_FP (frame); | |
267 | // OBSOLETE else if (frame->fsr->regs[regno]) | |
268 | // OBSOLETE return read_memory_integer (frame->fsr->regs[regno], 4); | |
269 | // OBSOLETE } | |
270 | // OBSOLETE return read_register (regno); | |
271 | // OBSOLETE } | |
272 | // OBSOLETE | |
273 | // OBSOLETE /* Examine the prologue of a function. `ip' points to the first instruction. | |
274 | // OBSOLETE `limit' is the limit of the prologue (e.g. the addr of the first | |
275 | // OBSOLETE linenumber, or perhaps the program counter if we're stepping through). | |
276 | // OBSOLETE `frame_sp' is the stack pointer value in use in this frame. | |
277 | // OBSOLETE `fsr' is a pointer to a frame_saved_regs structure into which we put | |
278 | // OBSOLETE info about the registers saved by this frame. | |
279 | // OBSOLETE `fi' is a struct frame_info pointer; we fill in various fields in it | |
280 | // OBSOLETE to reflect the offsets of the arg pointer and the locals pointer. */ | |
281 | // OBSOLETE | |
282 | // OBSOLETE static CORE_ADDR | |
283 | // OBSOLETE examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit, | |
284 | // OBSOLETE CORE_ADDR frame_sp, struct frame_saved_regs *fsr, | |
285 | // OBSOLETE struct frame_info *fi) | |
286 | // OBSOLETE { | |
287 | // OBSOLETE register CORE_ADDR next_ip; | |
288 | // OBSOLETE register int src; | |
289 | // OBSOLETE unsigned long insn; | |
290 | // OBSOLETE int size, offset; | |
291 | // OBSOLETE char must_adjust[32]; /* If set, must adjust offsets in fsr */ | |
292 | // OBSOLETE int sp_offset = -1; /* -1 means not set (valid must be mult of 8) */ | |
293 | // OBSOLETE int fp_offset = -1; /* -1 means not set */ | |
294 | // OBSOLETE CORE_ADDR frame_fp; | |
295 | // OBSOLETE CORE_ADDR prologue_end = 0; | |
296 | // OBSOLETE | |
297 | // OBSOLETE memset (must_adjust, '\0', sizeof (must_adjust)); | |
298 | // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn); | |
299 | // OBSOLETE | |
300 | // OBSOLETE while (next_ip) | |
301 | // OBSOLETE { | |
302 | // OBSOLETE struct prologue_insns *pip; | |
303 | // OBSOLETE | |
304 | // OBSOLETE for (pip = prologue_insn_tbl; (insn & pip->mask) != pip->insn;) | |
305 | // OBSOLETE if (++pip >= prologue_insn_tbl + sizeof prologue_insn_tbl) | |
306 | // OBSOLETE goto end_of_prologue_found; /* not a prologue insn */ | |
307 | // OBSOLETE | |
308 | // OBSOLETE switch (pip->action) | |
309 | // OBSOLETE { | |
310 | // OBSOLETE case PIA_NOTE_ST: | |
311 | // OBSOLETE case PIA_NOTE_STD: | |
312 | // OBSOLETE if (sp_offset != -1) | |
313 | // OBSOLETE { | |
314 | // OBSOLETE src = ST_SRC (insn); | |
315 | // OBSOLETE offset = ST_OFFSET (insn); | |
316 | // OBSOLETE must_adjust[src] = 1; | |
317 | // OBSOLETE fsr->regs[src++] = offset; /* Will be adjusted later */ | |
318 | // OBSOLETE if (pip->action == PIA_NOTE_STD && src < 32) | |
319 | // OBSOLETE { | |
320 | // OBSOLETE offset += 4; | |
321 | // OBSOLETE must_adjust[src] = 1; | |
322 | // OBSOLETE fsr->regs[src++] = offset; | |
323 | // OBSOLETE } | |
324 | // OBSOLETE } | |
325 | // OBSOLETE else | |
326 | // OBSOLETE goto end_of_prologue_found; | |
327 | // OBSOLETE break; | |
328 | // OBSOLETE case PIA_NOTE_SP_ADJUSTMENT: | |
329 | // OBSOLETE if (sp_offset == -1) | |
330 | // OBSOLETE sp_offset = -SUBU_OFFSET (insn); | |
331 | // OBSOLETE else | |
332 | // OBSOLETE goto end_of_prologue_found; | |
333 | // OBSOLETE break; | |
334 | // OBSOLETE case PIA_NOTE_FP_ASSIGNMENT: | |
335 | // OBSOLETE if (fp_offset == -1) | |
336 | // OBSOLETE fp_offset = ADDU_OFFSET (insn); | |
337 | // OBSOLETE else | |
338 | // OBSOLETE goto end_of_prologue_found; | |
339 | // OBSOLETE break; | |
340 | // OBSOLETE case PIA_NOTE_PROLOGUE_END: | |
341 | // OBSOLETE if (!prologue_end) | |
342 | // OBSOLETE prologue_end = ip; | |
343 | // OBSOLETE break; | |
344 | // OBSOLETE case PIA_SKIP: | |
345 | // OBSOLETE default: | |
346 | // OBSOLETE /* Do nothing */ | |
347 | // OBSOLETE break; | |
348 | // OBSOLETE } | |
349 | // OBSOLETE | |
350 | // OBSOLETE ip = next_ip; | |
351 | // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn); | |
352 | // OBSOLETE } | |
353 | // OBSOLETE | |
354 | // OBSOLETE end_of_prologue_found: | |
355 | // OBSOLETE | |
356 | // OBSOLETE if (prologue_end) | |
357 | // OBSOLETE ip = prologue_end; | |
358 | // OBSOLETE | |
359 | // OBSOLETE /* We're done with the prologue. If we don't care about the stack | |
360 | // OBSOLETE frame itself, just return. (Note that fsr->regs has been trashed, | |
361 | // OBSOLETE but the one caller who calls with fi==0 passes a dummy there.) */ | |
362 | // OBSOLETE | |
363 | // OBSOLETE if (fi == 0) | |
364 | // OBSOLETE return ip; | |
365 | // OBSOLETE | |
366 | // OBSOLETE /* | |
367 | // OBSOLETE OK, now we have: | |
368 | // OBSOLETE | |
369 | // OBSOLETE sp_offset original (before any alloca calls) displacement of SP | |
370 | // OBSOLETE (will be negative). | |
371 | // OBSOLETE | |
372 | // OBSOLETE fp_offset displacement from original SP to the FP for this frame | |
373 | // OBSOLETE or -1. | |
374 | // OBSOLETE | |
375 | // OBSOLETE fsr->regs[0..31] displacement from original SP to the stack | |
376 | // OBSOLETE location where reg[0..31] is stored. | |
377 | // OBSOLETE | |
378 | // OBSOLETE must_adjust[0..31] set if corresponding offset was set. | |
379 | // OBSOLETE | |
380 | // OBSOLETE If alloca has been called between the function prologue and the current | |
381 | // OBSOLETE IP, then the current SP (frame_sp) will not be the original SP as set by | |
382 | // OBSOLETE the function prologue. If the current SP is not the original SP, then the | |
383 | // OBSOLETE compiler will have allocated an FP for this frame, fp_offset will be set, | |
384 | // OBSOLETE and we can use it to calculate the original SP. | |
385 | // OBSOLETE | |
386 | // OBSOLETE Then, we figure out where the arguments and locals are, and relocate the | |
387 | // OBSOLETE offsets in fsr->regs to absolute addresses. */ | |
388 | // OBSOLETE | |
389 | // OBSOLETE if (fp_offset != -1) | |
390 | // OBSOLETE { | |
391 | // OBSOLETE /* We have a frame pointer, so get it, and base our calc's on it. */ | |
392 | // OBSOLETE frame_fp = (CORE_ADDR) read_next_frame_reg (fi->next, ACTUAL_FP_REGNUM); | |
393 | // OBSOLETE frame_sp = frame_fp - fp_offset; | |
394 | // OBSOLETE } | |
395 | // OBSOLETE else | |
396 | // OBSOLETE { | |
397 | // OBSOLETE /* We have no frame pointer, therefore frame_sp is still the same value | |
398 | // OBSOLETE as set by prologue. But where is the frame itself? */ | |
399 | // OBSOLETE if (must_adjust[SRP_REGNUM]) | |
400 | // OBSOLETE { | |
401 | // OBSOLETE /* Function header saved SRP (r1), the return address. Frame starts | |
402 | // OBSOLETE 4 bytes down from where it was saved. */ | |
403 | // OBSOLETE frame_fp = frame_sp + fsr->regs[SRP_REGNUM] - 4; | |
404 | // OBSOLETE fi->locals_pointer = frame_fp; | |
405 | // OBSOLETE } | |
406 | // OBSOLETE else | |
407 | // OBSOLETE { | |
408 | // OBSOLETE /* Function header didn't save SRP (r1), so we are in a leaf fn or | |
409 | // OBSOLETE are otherwise confused. */ | |
410 | // OBSOLETE frame_fp = -1; | |
411 | // OBSOLETE } | |
412 | // OBSOLETE } | |
413 | // OBSOLETE | |
414 | // OBSOLETE /* The locals are relative to the FP (whether it exists as an allocated | |
415 | // OBSOLETE register, or just as an assumed offset from the SP) */ | |
416 | // OBSOLETE fi->locals_pointer = frame_fp; | |
417 | // OBSOLETE | |
418 | // OBSOLETE /* The arguments are just above the SP as it was before we adjusted it | |
419 | // OBSOLETE on entry. */ | |
420 | // OBSOLETE fi->args_pointer = frame_sp - sp_offset; | |
421 | // OBSOLETE | |
422 | // OBSOLETE /* Now that we know the SP value used by the prologue, we know where | |
423 | // OBSOLETE it saved all the registers. */ | |
424 | // OBSOLETE for (src = 0; src < 32; src++) | |
425 | // OBSOLETE if (must_adjust[src]) | |
426 | // OBSOLETE fsr->regs[src] += frame_sp; | |
427 | // OBSOLETE | |
428 | // OBSOLETE /* The saved value of the SP is always known. */ | |
429 | // OBSOLETE /* (we hope...) */ | |
430 | // OBSOLETE if (fsr->regs[SP_REGNUM] != 0 | |
431 | // OBSOLETE && fsr->regs[SP_REGNUM] != frame_sp - sp_offset) | |
432 | // OBSOLETE fprintf_unfiltered (gdb_stderr, "Bad saved SP value %lx != %lx, offset %x!\n", | |
433 | // OBSOLETE fsr->regs[SP_REGNUM], | |
434 | // OBSOLETE frame_sp - sp_offset, sp_offset); | |
435 | // OBSOLETE | |
436 | // OBSOLETE fsr->regs[SP_REGNUM] = frame_sp - sp_offset; | |
437 | // OBSOLETE | |
438 | // OBSOLETE return (ip); | |
439 | // OBSOLETE } | |
440 | // OBSOLETE | |
441 | // OBSOLETE /* Given an ip value corresponding to the start of a function, | |
442 | // OBSOLETE return the ip of the first instruction after the function | |
443 | // OBSOLETE prologue. */ | |
444 | // OBSOLETE | |
445 | // OBSOLETE CORE_ADDR | |
446 | // OBSOLETE m88k_skip_prologue (CORE_ADDR ip) | |
447 | // OBSOLETE { | |
448 | // OBSOLETE struct frame_saved_regs saved_regs_dummy; | |
449 | // OBSOLETE struct symtab_and_line sal; | |
450 | // OBSOLETE CORE_ADDR limit; | |
451 | // OBSOLETE | |
452 | // OBSOLETE sal = find_pc_line (ip, 0); | |
453 | // OBSOLETE limit = (sal.end) ? sal.end : 0xffffffff; | |
454 | // OBSOLETE | |
455 | // OBSOLETE return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy, | |
456 | // OBSOLETE (struct frame_info *) 0)); | |
457 | // OBSOLETE } | |
458 | // OBSOLETE | |
459 | // OBSOLETE /* Put here the code to store, into a struct frame_saved_regs, | |
460 | // OBSOLETE the addresses of the saved registers of frame described by FRAME_INFO. | |
461 | // OBSOLETE This includes special registers such as pc and fp saved in special | |
462 | // OBSOLETE ways in the stack frame. sp is even more special: | |
463 | // OBSOLETE the address we return for it IS the sp for the next frame. | |
464 | // OBSOLETE | |
465 | // OBSOLETE We cache the result of doing this in the frame_obstack, since it is | |
466 | // OBSOLETE fairly expensive. */ | |
467 | // OBSOLETE | |
468 | // OBSOLETE void | |
469 | // OBSOLETE frame_find_saved_regs (struct frame_info *fi, struct frame_saved_regs *fsr) | |
470 | // OBSOLETE { | |
471 | // OBSOLETE register struct frame_saved_regs *cache_fsr; | |
472 | // OBSOLETE CORE_ADDR ip; | |
473 | // OBSOLETE struct symtab_and_line sal; | |
474 | // OBSOLETE CORE_ADDR limit; | |
475 | // OBSOLETE | |
476 | // OBSOLETE if (!fi->fsr) | |
477 | // OBSOLETE { | |
478 | // OBSOLETE cache_fsr = (struct frame_saved_regs *) | |
479 | // OBSOLETE frame_obstack_alloc (sizeof (struct frame_saved_regs)); | |
480 | // OBSOLETE memset (cache_fsr, '\0', sizeof (struct frame_saved_regs)); | |
481 | // OBSOLETE fi->fsr = cache_fsr; | |
482 | // OBSOLETE | |
483 | // OBSOLETE /* Find the start and end of the function prologue. If the PC | |
484 | // OBSOLETE is in the function prologue, we only consider the part that | |
485 | // OBSOLETE has executed already. In the case where the PC is not in | |
486 | // OBSOLETE the function prologue, we set limit to two instructions beyond | |
487 | // OBSOLETE where the prologue ends in case if any of the prologue instructions | |
488 | // OBSOLETE were moved into a delay slot of a branch instruction. */ | |
489 | // OBSOLETE | |
490 | // OBSOLETE ip = get_pc_function_start (fi->pc); | |
491 | // OBSOLETE sal = find_pc_line (ip, 0); | |
492 | // OBSOLETE limit = (sal.end && sal.end < fi->pc) ? sal.end + 2 * BYTES_PER_88K_INSN | |
493 | // OBSOLETE : fi->pc; | |
494 | // OBSOLETE | |
495 | // OBSOLETE /* This will fill in fields in *fi as well as in cache_fsr. */ | |
496 | // OBSOLETE #ifdef SIGTRAMP_FRAME_FIXUP | |
497 | // OBSOLETE if (fi->signal_handler_caller) | |
498 | // OBSOLETE SIGTRAMP_FRAME_FIXUP (fi->frame); | |
499 | // OBSOLETE #endif | |
500 | // OBSOLETE examine_prologue (ip, limit, fi->frame, cache_fsr, fi); | |
501 | // OBSOLETE #ifdef SIGTRAMP_SP_FIXUP | |
502 | // OBSOLETE if (fi->signal_handler_caller && fi->fsr->regs[SP_REGNUM]) | |
503 | // OBSOLETE SIGTRAMP_SP_FIXUP (fi->fsr->regs[SP_REGNUM]); | |
504 | // OBSOLETE #endif | |
505 | // OBSOLETE } | |
506 | // OBSOLETE | |
507 | // OBSOLETE if (fsr) | |
508 | // OBSOLETE *fsr = *fi->fsr; | |
509 | // OBSOLETE } | |
510 | // OBSOLETE | |
511 | // OBSOLETE /* Return the address of the locals block for the frame | |
512 | // OBSOLETE described by FI. Returns 0 if the address is unknown. | |
513 | // OBSOLETE NOTE! Frame locals are referred to by negative offsets from the | |
514 | // OBSOLETE argument pointer, so this is the same as frame_args_address(). */ | |
515 | // OBSOLETE | |
516 | // OBSOLETE CORE_ADDR | |
517 | // OBSOLETE frame_locals_address (struct frame_info *fi) | |
518 | // OBSOLETE { | |
519 | // OBSOLETE struct frame_saved_regs fsr; | |
520 | // OBSOLETE | |
521 | // OBSOLETE if (fi->args_pointer) /* Cached value is likely there. */ | |
522 | // OBSOLETE return fi->args_pointer; | |
523 | // OBSOLETE | |
524 | // OBSOLETE /* Nope, generate it. */ | |
525 | // OBSOLETE | |
526 | // OBSOLETE get_frame_saved_regs (fi, &fsr); | |
527 | // OBSOLETE | |
528 | // OBSOLETE return fi->args_pointer; | |
529 | // OBSOLETE } | |
530 | // OBSOLETE | |
531 | // OBSOLETE /* Return the address of the argument block for the frame | |
532 | // OBSOLETE described by FI. Returns 0 if the address is unknown. */ | |
533 | // OBSOLETE | |
534 | // OBSOLETE CORE_ADDR | |
535 | // OBSOLETE frame_args_address (struct frame_info *fi) | |
536 | // OBSOLETE { | |
537 | // OBSOLETE struct frame_saved_regs fsr; | |
538 | // OBSOLETE | |
539 | // OBSOLETE if (fi->args_pointer) /* Cached value is likely there. */ | |
540 | // OBSOLETE return fi->args_pointer; | |
541 | // OBSOLETE | |
542 | // OBSOLETE /* Nope, generate it. */ | |
543 | // OBSOLETE | |
544 | // OBSOLETE get_frame_saved_regs (fi, &fsr); | |
545 | // OBSOLETE | |
546 | // OBSOLETE return fi->args_pointer; | |
547 | // OBSOLETE } | |
548 | // OBSOLETE | |
549 | // OBSOLETE /* Return the saved PC from this frame. | |
550 | // OBSOLETE | |
551 | // OBSOLETE If the frame has a memory copy of SRP_REGNUM, use that. If not, | |
552 | // OBSOLETE just use the register SRP_REGNUM itself. */ | |
553 | // OBSOLETE | |
554 | // OBSOLETE CORE_ADDR | |
555 | // OBSOLETE frame_saved_pc (struct frame_info *frame) | |
556 | // OBSOLETE { | |
557 | // OBSOLETE return read_next_frame_reg (frame, SRP_REGNUM); | |
558 | // OBSOLETE } | |
559 | // OBSOLETE | |
560 | // OBSOLETE | |
561 | // OBSOLETE #define DUMMY_FRAME_SIZE 192 | |
562 | // OBSOLETE | |
563 | // OBSOLETE static void | |
564 | // OBSOLETE write_word (CORE_ADDR sp, ULONGEST word) | |
565 | // OBSOLETE { | |
566 | // OBSOLETE register int len = REGISTER_SIZE; | |
567 | // OBSOLETE char buffer[MAX_REGISTER_RAW_SIZE]; | |
568 | // OBSOLETE | |
569 | // OBSOLETE store_unsigned_integer (buffer, len, word); | |
570 | // OBSOLETE write_memory (sp, buffer, len); | |
571 | // OBSOLETE } | |
572 | // OBSOLETE | |
573 | // OBSOLETE void | |
574 | // OBSOLETE m88k_push_dummy_frame (void) | |
575 | // OBSOLETE { | |
576 | // OBSOLETE register CORE_ADDR sp = read_register (SP_REGNUM); | |
577 | // OBSOLETE register int rn; | |
578 | // OBSOLETE int offset; | |
579 | // OBSOLETE | |
580 | // OBSOLETE sp -= DUMMY_FRAME_SIZE; /* allocate a bunch of space */ | |
581 | // OBSOLETE | |
582 | // OBSOLETE for (rn = 0, offset = 0; rn <= SP_REGNUM; rn++, offset += 4) | |
583 | // OBSOLETE write_word (sp + offset, read_register (rn)); | |
584 | // OBSOLETE | |
585 | // OBSOLETE write_word (sp + offset, read_register (SXIP_REGNUM)); | |
586 | // OBSOLETE offset += 4; | |
587 | // OBSOLETE | |
588 | // OBSOLETE write_word (sp + offset, read_register (SNIP_REGNUM)); | |
589 | // OBSOLETE offset += 4; | |
590 | // OBSOLETE | |
591 | // OBSOLETE write_word (sp + offset, read_register (SFIP_REGNUM)); | |
592 | // OBSOLETE offset += 4; | |
593 | // OBSOLETE | |
594 | // OBSOLETE write_word (sp + offset, read_register (PSR_REGNUM)); | |
595 | // OBSOLETE offset += 4; | |
596 | // OBSOLETE | |
597 | // OBSOLETE write_word (sp + offset, read_register (FPSR_REGNUM)); | |
598 | // OBSOLETE offset += 4; | |
599 | // OBSOLETE | |
600 | // OBSOLETE write_word (sp + offset, read_register (FPCR_REGNUM)); | |
601 | // OBSOLETE offset += 4; | |
602 | // OBSOLETE | |
603 | // OBSOLETE write_register (SP_REGNUM, sp); | |
604 | // OBSOLETE write_register (ACTUAL_FP_REGNUM, sp); | |
605 | // OBSOLETE } | |
606 | // OBSOLETE | |
607 | // OBSOLETE void | |
608 | // OBSOLETE pop_frame (void) | |
609 | // OBSOLETE { | |
610 | // OBSOLETE register struct frame_info *frame = get_current_frame (); | |
611 | // OBSOLETE register int regnum; | |
612 | // OBSOLETE struct frame_saved_regs fsr; | |
613 | // OBSOLETE | |
614 | // OBSOLETE get_frame_saved_regs (frame, &fsr); | |
615 | // OBSOLETE | |
616 | // OBSOLETE if (PC_IN_CALL_DUMMY (read_pc (), read_register (SP_REGNUM), frame->frame)) | |
617 | // OBSOLETE { | |
618 | // OBSOLETE /* FIXME: I think get_frame_saved_regs should be handling this so | |
619 | // OBSOLETE that we can deal with the saved registers properly (e.g. frame | |
620 | // OBSOLETE 1 is a call dummy, the user types "frame 2" and then "print $ps"). */ | |
621 | // OBSOLETE register CORE_ADDR sp = read_register (ACTUAL_FP_REGNUM); | |
622 | // OBSOLETE int offset; | |
623 | // OBSOLETE | |
624 | // OBSOLETE for (regnum = 0, offset = 0; regnum <= SP_REGNUM; regnum++, offset += 4) | |
625 | // OBSOLETE (void) write_register (regnum, read_memory_integer (sp + offset, 4)); | |
626 | // OBSOLETE | |
627 | // OBSOLETE write_register (SXIP_REGNUM, read_memory_integer (sp + offset, 4)); | |
628 | // OBSOLETE offset += 4; | |
629 | // OBSOLETE | |
630 | // OBSOLETE write_register (SNIP_REGNUM, read_memory_integer (sp + offset, 4)); | |
631 | // OBSOLETE offset += 4; | |
632 | // OBSOLETE | |
633 | // OBSOLETE write_register (SFIP_REGNUM, read_memory_integer (sp + offset, 4)); | |
634 | // OBSOLETE offset += 4; | |
635 | // OBSOLETE | |
636 | // OBSOLETE write_register (PSR_REGNUM, read_memory_integer (sp + offset, 4)); | |
637 | // OBSOLETE offset += 4; | |
638 | // OBSOLETE | |
639 | // OBSOLETE write_register (FPSR_REGNUM, read_memory_integer (sp + offset, 4)); | |
640 | // OBSOLETE offset += 4; | |
641 | // OBSOLETE | |
642 | // OBSOLETE write_register (FPCR_REGNUM, read_memory_integer (sp + offset, 4)); | |
643 | // OBSOLETE offset += 4; | |
644 | // OBSOLETE | |
645 | // OBSOLETE } | |
646 | // OBSOLETE else | |
647 | // OBSOLETE { | |
648 | // OBSOLETE for (regnum = FP_REGNUM; regnum > 0; regnum--) | |
649 | // OBSOLETE if (fsr.regs[regnum]) | |
650 | // OBSOLETE write_register (regnum, | |
651 | // OBSOLETE read_memory_integer (fsr.regs[regnum], 4)); | |
652 | // OBSOLETE write_pc (frame_saved_pc (frame)); | |
653 | // OBSOLETE } | |
654 | // OBSOLETE reinit_frame_cache (); | |
655 | // OBSOLETE } | |
656 | // OBSOLETE | |
657 | // OBSOLETE void | |
658 | // OBSOLETE _initialize_m88k_tdep (void) | |
659 | // OBSOLETE { | |
660 | // OBSOLETE tm_print_insn = print_insn_m88k; | |
661 | // OBSOLETE } |