1 // OBSOLETE /* Target-machine dependent code for the Intel 960
3 // OBSOLETE Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
4 // OBSOLETE 2001, 2002 Free Software Foundation, Inc.
6 // OBSOLETE Contributed by Intel Corporation.
7 // OBSOLETE examine_prologue and other parts contributed by Wind River Systems.
9 // OBSOLETE This file is part of GDB.
11 // OBSOLETE This program is free software; you can redistribute it and/or modify
12 // OBSOLETE it under the terms of the GNU General Public License as published by
13 // OBSOLETE the Free Software Foundation; either version 2 of the License, or
14 // OBSOLETE (at your option) any later version.
16 // OBSOLETE This program is distributed in the hope that it will be useful,
17 // OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // OBSOLETE GNU General Public License for more details.
21 // OBSOLETE You should have received a copy of the GNU General Public License
22 // OBSOLETE along with this program; if not, write to the Free Software
23 // OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330,
24 // OBSOLETE Boston, MA 02111-1307, USA. */
26 // OBSOLETE #include "defs.h"
27 // OBSOLETE #include "symtab.h"
28 // OBSOLETE #include "value.h"
29 // OBSOLETE #include "frame.h"
30 // OBSOLETE #include "floatformat.h"
31 // OBSOLETE #include "target.h"
32 // OBSOLETE #include "gdbcore.h"
33 // OBSOLETE #include "inferior.h"
34 // OBSOLETE #include "regcache.h"
35 // OBSOLETE #include "gdb_string.h"
37 // OBSOLETE static CORE_ADDR next_insn (CORE_ADDR memaddr,
38 // OBSOLETE unsigned int *pword1, unsigned int *pword2);
40 // OBSOLETE struct type *
41 // OBSOLETE i960_register_type (int regnum)
43 // OBSOLETE if (regnum < FP0_REGNUM)
44 // OBSOLETE return builtin_type_int32;
46 // OBSOLETE return builtin_type_i960_ext;
50 // OBSOLETE /* Does the specified function use the "struct returning" convention
51 // OBSOLETE or the "value returning" convention? The "value returning" convention
52 // OBSOLETE almost invariably returns the entire value in registers. The
53 // OBSOLETE "struct returning" convention often returns the entire value in
54 // OBSOLETE memory, and passes a pointer (out of or into the function) saying
55 // OBSOLETE where the value (is or should go).
57 // OBSOLETE Since this sometimes depends on whether it was compiled with GCC,
58 // OBSOLETE this is also an argument. This is used in call_function to build a
59 // OBSOLETE stack, and in value_being_returned to print return values.
61 // OBSOLETE On i960, a structure is returned in registers g0-g3, if it will fit.
62 // OBSOLETE If it's more than 16 bytes long, g13 pointed to it on entry. */
65 // OBSOLETE i960_use_struct_convention (int gcc_p, struct type *type)
67 // OBSOLETE return (TYPE_LENGTH (type) > 16);
70 // OBSOLETE /* gdb960 is always running on a non-960 host. Check its characteristics.
71 // OBSOLETE This routine must be called as part of gdb initialization. */
73 // OBSOLETE static void
74 // OBSOLETE check_host (void)
78 // OBSOLETE static struct typestruct
80 // OBSOLETE int hostsize; /* Size of type on host */
81 // OBSOLETE int i960size; /* Size of type on i960 */
82 // OBSOLETE char *typename; /* Name of type, for error msg */
87 // OBSOLETE sizeof (short), 2, "short"
91 // OBSOLETE sizeof (int), 4, "int"
95 // OBSOLETE sizeof (long), 4, "long"
99 // OBSOLETE sizeof (float), 4, "float"
103 // OBSOLETE sizeof (double), 8, "double"
107 // OBSOLETE sizeof (char *), 4, "pointer"
111 // OBSOLETE #define TYPELEN (sizeof(types) / sizeof(struct typestruct))
113 // OBSOLETE /* Make sure that host type sizes are same as i960
115 // OBSOLETE for (i = 0; i < TYPELEN; i++)
117 // OBSOLETE if (types[i].hostsize != types[i].i960size)
119 // OBSOLETE printf_unfiltered ("sizeof(%s) != %d: PROCEED AT YOUR OWN RISK!\n",
120 // OBSOLETE types[i].typename, types[i].i960size);
126 // OBSOLETE /* Is this register part of the register window system? A yes answer
127 // OBSOLETE implies that 1) The name of this register will not be the same in
128 // OBSOLETE other frames, and 2) This register is automatically "saved" upon
129 // OBSOLETE subroutine calls and thus there is no need to search more than one
130 // OBSOLETE stack frame for it.
132 // OBSOLETE On the i960, in fact, the name of this register in another frame is
133 // OBSOLETE "mud" -- there is no overlap between the windows. Each window is
134 // OBSOLETE simply saved into the stack (true for our purposes, after having been
135 // OBSOLETE flushed; normally they reside on-chip and are restored from on-chip
136 // OBSOLETE without ever going to memory). */
138 // OBSOLETE static int
139 // OBSOLETE register_in_window_p (int regnum)
141 // OBSOLETE return regnum <= R15_REGNUM;
144 // OBSOLETE /* i960_find_saved_register ()
146 // OBSOLETE Return the address in which frame FRAME's value of register REGNUM
147 // OBSOLETE has been saved in memory. Or return zero if it has not been saved.
148 // OBSOLETE If REGNUM specifies the SP, the value we return is actually the SP
149 // OBSOLETE value, not an address where it was saved. */
151 // OBSOLETE static CORE_ADDR
152 // OBSOLETE i960_find_saved_register (struct frame_info *frame, int regnum)
154 // OBSOLETE register struct frame_info *frame1 = NULL;
155 // OBSOLETE register CORE_ADDR addr = 0;
157 // OBSOLETE if (frame == NULL) /* No regs saved if want current frame */
158 // OBSOLETE return 0;
160 // OBSOLETE /* We assume that a register in a register window will only be saved
161 // OBSOLETE in one place (since the name changes and/or disappears as you go
162 // OBSOLETE towards inner frames), so we only call get_frame_saved_regs on
163 // OBSOLETE the current frame. This is directly in contradiction to the
164 // OBSOLETE usage below, which assumes that registers used in a frame must be
165 // OBSOLETE saved in a lower (more interior) frame. This change is a result
166 // OBSOLETE of working on a register window machine; get_frame_saved_regs
167 // OBSOLETE always returns the registers saved within a frame, within the
168 // OBSOLETE context (register namespace) of that frame. */
170 // OBSOLETE /* However, note that we don't want this to return anything if
171 // OBSOLETE nothing is saved (if there's a frame inside of this one). Also,
172 // OBSOLETE callers to this routine asking for the stack pointer want the
173 // OBSOLETE stack pointer saved for *this* frame; this is returned from the
174 // OBSOLETE next frame. */
176 // OBSOLETE if (register_in_window_p (regnum))
178 // OBSOLETE frame1 = get_next_frame (frame);
179 // OBSOLETE if (!frame1)
180 // OBSOLETE return 0; /* Registers of this frame are active. */
182 // OBSOLETE /* Get the SP from the next frame in; it will be this
183 // OBSOLETE current frame. */
184 // OBSOLETE if (regnum != SP_REGNUM)
185 // OBSOLETE frame1 = frame;
187 // OBSOLETE FRAME_INIT_SAVED_REGS (frame1);
188 // OBSOLETE return frame1->saved_regs[regnum]; /* ... which might be zero */
191 // OBSOLETE /* Note that this next routine assumes that registers used in
192 // OBSOLETE frame x will be saved only in the frame that x calls and
193 // OBSOLETE frames interior to it. This is not true on the sparc, but the
194 // OBSOLETE above macro takes care of it, so we should be all right. */
195 // OBSOLETE while (1)
198 // OBSOLETE frame1 = get_next_frame (frame);
199 // OBSOLETE if (frame1 == 0)
201 // OBSOLETE frame = frame1;
202 // OBSOLETE FRAME_INIT_SAVED_REGS (frame1);
203 // OBSOLETE if (frame1->saved_regs[regnum])
204 // OBSOLETE addr = frame1->saved_regs[regnum];
207 // OBSOLETE return addr;
210 // OBSOLETE /* i960_get_saved_register ()
212 // OBSOLETE Find register number REGNUM relative to FRAME and put its (raw,
213 // OBSOLETE target format) contents in *RAW_BUFFER. Set *OPTIMIZED if the
214 // OBSOLETE variable was optimized out (and thus can't be fetched). Set *LVAL
215 // OBSOLETE to lval_memory, lval_register, or not_lval, depending on whether
216 // OBSOLETE the value was fetched from memory, from a register, or in a strange
217 // OBSOLETE and non-modifiable way (e.g. a frame pointer which was calculated
218 // OBSOLETE rather than fetched). Set *ADDRP to the address, either in memory
219 // OBSOLETE on as a REGISTER_BYTE offset into the registers array.
221 // OBSOLETE Note that this implementation never sets *LVAL to not_lval. But it
222 // OBSOLETE can be replaced by defining GET_SAVED_REGISTER and supplying your
225 // OBSOLETE The argument RAW_BUFFER must point to aligned memory. */
228 // OBSOLETE i960_get_saved_register (char *raw_buffer,
229 // OBSOLETE int *optimized,
230 // OBSOLETE CORE_ADDR *addrp,
231 // OBSOLETE struct frame_info *frame,
232 // OBSOLETE int regnum,
233 // OBSOLETE enum lval_type *lval)
235 // OBSOLETE CORE_ADDR addr;
237 // OBSOLETE if (!target_has_registers)
238 // OBSOLETE error ("No registers.");
240 // OBSOLETE /* Normal systems don't optimize out things with register numbers. */
241 // OBSOLETE if (optimized != NULL)
242 // OBSOLETE *optimized = 0;
243 // OBSOLETE addr = i960_find_saved_register (frame, regnum);
244 // OBSOLETE if (addr != 0)
246 // OBSOLETE if (lval != NULL)
247 // OBSOLETE *lval = lval_memory;
248 // OBSOLETE if (regnum == SP_REGNUM)
250 // OBSOLETE if (raw_buffer != NULL)
252 // OBSOLETE /* Put it back in target format. */
253 // OBSOLETE store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
254 // OBSOLETE (LONGEST) addr);
256 // OBSOLETE if (addrp != NULL)
257 // OBSOLETE *addrp = 0;
260 // OBSOLETE if (raw_buffer != NULL)
261 // OBSOLETE target_read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
265 // OBSOLETE if (lval != NULL)
266 // OBSOLETE *lval = lval_register;
267 // OBSOLETE addr = REGISTER_BYTE (regnum);
268 // OBSOLETE if (raw_buffer != NULL)
269 // OBSOLETE read_register_gen (regnum, raw_buffer);
271 // OBSOLETE if (addrp != NULL)
272 // OBSOLETE *addrp = addr;
275 // OBSOLETE /* Examine an i960 function prologue, recording the addresses at which
276 // OBSOLETE registers are saved explicitly by the prologue code, and returning
277 // OBSOLETE the address of the first instruction after the prologue (but not
278 // OBSOLETE after the instruction at address LIMIT, as explained below).
280 // OBSOLETE LIMIT places an upper bound on addresses of the instructions to be
281 // OBSOLETE examined. If the prologue code scan reaches LIMIT, the scan is
282 // OBSOLETE aborted and LIMIT is returned. This is used, when examining the
283 // OBSOLETE prologue for the current frame, to keep examine_prologue () from
284 // OBSOLETE claiming that a given register has been saved when in fact the
285 // OBSOLETE instruction that saves it has not yet been executed. LIMIT is used
286 // OBSOLETE at other times to stop the scan when we hit code after the true
287 // OBSOLETE function prologue (e.g. for the first source line) which might
288 // OBSOLETE otherwise be mistaken for function prologue.
290 // OBSOLETE The format of the function prologue matched by this routine is
291 // OBSOLETE derived from examination of the source to gcc960 1.21, particularly
292 // OBSOLETE the routine i960_function_prologue (). A "regular expression" for
293 // OBSOLETE the function prologue is given below:
295 // OBSOLETE (lda LRn, g14
296 // OBSOLETE mov g14, g[0-7]
297 // OBSOLETE (mov 0, g14) | (lda 0, g14))?
299 // OBSOLETE (mov[qtl]? g[0-15], r[4-15])*
300 // OBSOLETE ((addo [1-31], sp, sp) | (lda n(sp), sp))?
301 // OBSOLETE (st[qtl]? g[0-15], n(fp))*
303 // OBSOLETE (cmpobne 0, g14, LFn
304 // OBSOLETE mov sp, g14
305 // OBSOLETE lda 0x30(sp), sp
306 // OBSOLETE LFn: stq g0, (g14)
307 // OBSOLETE stq g4, 0x10(g14)
308 // OBSOLETE stq g8, 0x20(g14))?
310 // OBSOLETE (st g14, n(fp))?
311 // OBSOLETE (mov g13,r[4-15])?
314 // OBSOLETE /* Macros for extracting fields from i960 instructions. */
316 // OBSOLETE #define BITMASK(pos, width) (((0x1 << (width)) - 1) << (pos))
317 // OBSOLETE #define EXTRACT_FIELD(val, pos, width) ((val) >> (pos) & BITMASK (0, width))
319 // OBSOLETE #define REG_SRC1(insn) EXTRACT_FIELD (insn, 0, 5)
320 // OBSOLETE #define REG_SRC2(insn) EXTRACT_FIELD (insn, 14, 5)
321 // OBSOLETE #define REG_SRCDST(insn) EXTRACT_FIELD (insn, 19, 5)
322 // OBSOLETE #define MEM_SRCDST(insn) EXTRACT_FIELD (insn, 19, 5)
323 // OBSOLETE #define MEMA_OFFSET(insn) EXTRACT_FIELD (insn, 0, 12)
325 // OBSOLETE /* Fetch the instruction at ADDR, returning 0 if ADDR is beyond LIM or
326 // OBSOLETE is not the address of a valid instruction, the address of the next
327 // OBSOLETE instruction beyond ADDR otherwise. *PWORD1 receives the first word
328 // OBSOLETE of the instruction, and (for two-word instructions), *PWORD2 receives
329 // OBSOLETE the second. */
331 // OBSOLETE #define NEXT_PROLOGUE_INSN(addr, lim, pword1, pword2) \
332 // OBSOLETE (((addr) < (lim)) ? next_insn (addr, pword1, pword2) : 0)
334 // OBSOLETE static CORE_ADDR
335 // OBSOLETE examine_prologue (register CORE_ADDR ip, register CORE_ADDR limit,
336 // OBSOLETE CORE_ADDR frame_addr, struct frame_saved_regs *fsr)
338 // OBSOLETE register CORE_ADDR next_ip;
339 // OBSOLETE register int src, dst;
340 // OBSOLETE register unsigned int *pcode;
341 // OBSOLETE unsigned int insn1, insn2;
342 // OBSOLETE int size;
343 // OBSOLETE int within_leaf_prologue;
344 // OBSOLETE CORE_ADDR save_addr;
345 // OBSOLETE static unsigned int varargs_prologue_code[] =
347 // OBSOLETE 0x3507a00c, /* cmpobne 0x0, g14, LFn */
348 // OBSOLETE 0x5cf01601, /* mov sp, g14 */
349 // OBSOLETE 0x8c086030, /* lda 0x30(sp), sp */
350 // OBSOLETE 0xb2879000, /* LFn: stq g0, (g14) */
351 // OBSOLETE 0xb2a7a010, /* stq g4, 0x10(g14) */
352 // OBSOLETE 0xb2c7a020 /* stq g8, 0x20(g14) */
355 // OBSOLETE /* Accept a leaf procedure prologue code fragment if present.
356 // OBSOLETE Note that ip might point to either the leaf or non-leaf
357 // OBSOLETE entry point; we look for the non-leaf entry point first: */
359 // OBSOLETE within_leaf_prologue = 0;
360 // OBSOLETE if ((next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2))
361 // OBSOLETE && ((insn1 & 0xfffff000) == 0x8cf00000 /* lda LRx, g14 (MEMA) */
362 // OBSOLETE || (insn1 & 0xfffffc60) == 0x8cf03000)) /* lda LRx, g14 (MEMB) */
364 // OBSOLETE within_leaf_prologue = 1;
365 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn1, &insn2);
368 // OBSOLETE /* Now look for the prologue code at a leaf entry point: */
370 // OBSOLETE if (next_ip
371 // OBSOLETE && (insn1 & 0xff87ffff) == 0x5c80161e /* mov g14, gx */
372 // OBSOLETE && REG_SRCDST (insn1) <= G0_REGNUM + 7)
374 // OBSOLETE within_leaf_prologue = 1;
375 // OBSOLETE if ((next_ip = NEXT_PROLOGUE_INSN (next_ip, limit, &insn1, &insn2))
376 // OBSOLETE && (insn1 == 0x8cf00000 /* lda 0, g14 */
377 // OBSOLETE || insn1 == 0x5cf01e00)) /* mov 0, g14 */
379 // OBSOLETE ip = next_ip;
380 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
381 // OBSOLETE within_leaf_prologue = 0;
385 // OBSOLETE /* If something that looks like the beginning of a leaf prologue
386 // OBSOLETE has been seen, but the remainder of the prologue is missing, bail.
387 // OBSOLETE We don't know what we've got. */
389 // OBSOLETE if (within_leaf_prologue)
390 // OBSOLETE return (ip);
392 // OBSOLETE /* Accept zero or more instances of "mov[qtl]? gx, ry", where y >= 4.
393 // OBSOLETE This may cause us to mistake the moving of a register
394 // OBSOLETE parameter to a local register for the saving of a callee-saved
395 // OBSOLETE register, but that can't be helped, since with the
396 // OBSOLETE "-fcall-saved" flag, any register can be made callee-saved. */
398 // OBSOLETE while (next_ip
399 // OBSOLETE && (insn1 & 0xfc802fb0) == 0x5c000610
400 // OBSOLETE && (dst = REG_SRCDST (insn1)) >= (R0_REGNUM + 4))
402 // OBSOLETE src = REG_SRC1 (insn1);
403 // OBSOLETE size = EXTRACT_FIELD (insn1, 24, 2) + 1;
404 // OBSOLETE save_addr = frame_addr + ((dst - R0_REGNUM) * 4);
405 // OBSOLETE while (size--)
407 // OBSOLETE fsr->regs[src++] = save_addr;
408 // OBSOLETE save_addr += 4;
410 // OBSOLETE ip = next_ip;
411 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
414 // OBSOLETE /* Accept an optional "addo n, sp, sp" or "lda n(sp), sp". */
416 // OBSOLETE if (next_ip &&
417 // OBSOLETE ((insn1 & 0xffffffe0) == 0x59084800 /* addo n, sp, sp */
418 // OBSOLETE || (insn1 & 0xfffff000) == 0x8c086000 /* lda n(sp), sp (MEMA) */
419 // OBSOLETE || (insn1 & 0xfffffc60) == 0x8c087400)) /* lda n(sp), sp (MEMB) */
421 // OBSOLETE ip = next_ip;
422 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
425 // OBSOLETE /* Accept zero or more instances of "st[qtl]? gx, n(fp)".
426 // OBSOLETE This may cause us to mistake the copying of a register
427 // OBSOLETE parameter to the frame for the saving of a callee-saved
428 // OBSOLETE register, but that can't be helped, since with the
429 // OBSOLETE "-fcall-saved" flag, any register can be made callee-saved.
430 // OBSOLETE We can, however, refuse to accept a save of register g14,
431 // OBSOLETE since that is matched explicitly below. */
433 // OBSOLETE while (next_ip &&
434 // OBSOLETE ((insn1 & 0xf787f000) == 0x9287e000 /* stl? gx, n(fp) (MEMA) */
435 // OBSOLETE || (insn1 & 0xf787fc60) == 0x9287f400 /* stl? gx, n(fp) (MEMB) */
436 // OBSOLETE || (insn1 & 0xef87f000) == 0xa287e000 /* st[tq] gx, n(fp) (MEMA) */
437 // OBSOLETE || (insn1 & 0xef87fc60) == 0xa287f400) /* st[tq] gx, n(fp) (MEMB) */
438 // OBSOLETE && ((src = MEM_SRCDST (insn1)) != G14_REGNUM))
440 // OBSOLETE save_addr = frame_addr + ((insn1 & BITMASK (12, 1))
441 // OBSOLETE ? insn2 : MEMA_OFFSET (insn1));
442 // OBSOLETE size = (insn1 & BITMASK (29, 1)) ? ((insn1 & BITMASK (28, 1)) ? 4 : 3)
443 // OBSOLETE : ((insn1 & BITMASK (27, 1)) ? 2 : 1);
444 // OBSOLETE while (size--)
446 // OBSOLETE fsr->regs[src++] = save_addr;
447 // OBSOLETE save_addr += 4;
449 // OBSOLETE ip = next_ip;
450 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
453 // OBSOLETE /* Accept the varargs prologue code if present. */
455 // OBSOLETE size = sizeof (varargs_prologue_code) / sizeof (int);
456 // OBSOLETE pcode = varargs_prologue_code;
457 // OBSOLETE while (size-- && next_ip && *pcode++ == insn1)
459 // OBSOLETE ip = next_ip;
460 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
463 // OBSOLETE /* Accept an optional "st g14, n(fp)". */
465 // OBSOLETE if (next_ip &&
466 // OBSOLETE ((insn1 & 0xfffff000) == 0x92f7e000 /* st g14, n(fp) (MEMA) */
467 // OBSOLETE || (insn1 & 0xfffffc60) == 0x92f7f400)) /* st g14, n(fp) (MEMB) */
469 // OBSOLETE fsr->regs[G14_REGNUM] = frame_addr + ((insn1 & BITMASK (12, 1))
470 // OBSOLETE ? insn2 : MEMA_OFFSET (insn1));
471 // OBSOLETE ip = next_ip;
472 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
475 // OBSOLETE /* Accept zero or one instance of "mov g13, ry", where y >= 4.
476 // OBSOLETE This is saving the address where a struct should be returned. */
478 // OBSOLETE if (next_ip
479 // OBSOLETE && (insn1 & 0xff802fbf) == 0x5c00061d
480 // OBSOLETE && (dst = REG_SRCDST (insn1)) >= (R0_REGNUM + 4))
482 // OBSOLETE save_addr = frame_addr + ((dst - R0_REGNUM) * 4);
483 // OBSOLETE fsr->regs[G0_REGNUM + 13] = save_addr;
484 // OBSOLETE ip = next_ip;
485 // OBSOLETE #if 0 /* We'll need this once there is a subsequent instruction examined. */
486 // OBSOLETE next_ip = NEXT_PROLOGUE_INSN (ip, limit, &insn1, &insn2);
490 // OBSOLETE return (ip);
493 // OBSOLETE /* Given an ip value corresponding to the start of a function,
494 // OBSOLETE return the ip of the first instruction after the function
495 // OBSOLETE prologue. */
497 // OBSOLETE CORE_ADDR
498 // OBSOLETE i960_skip_prologue (CORE_ADDR ip)
500 // OBSOLETE struct frame_saved_regs saved_regs_dummy;
501 // OBSOLETE struct symtab_and_line sal;
502 // OBSOLETE CORE_ADDR limit;
504 // OBSOLETE sal = find_pc_line (ip, 0);
505 // OBSOLETE limit = (sal.end) ? sal.end : 0xffffffff;
507 // OBSOLETE return (examine_prologue (ip, limit, (CORE_ADDR) 0, &saved_regs_dummy));
510 // OBSOLETE /* Put here the code to store, into a struct frame_saved_regs,
511 // OBSOLETE the addresses of the saved registers of frame described by FRAME_INFO.
512 // OBSOLETE This includes special registers such as pc and fp saved in special
513 // OBSOLETE ways in the stack frame. sp is even more special:
514 // OBSOLETE the address we return for it IS the sp for the next frame.
516 // OBSOLETE We cache the result of doing this in the frame_obstack, since it is
517 // OBSOLETE fairly expensive. */
520 // OBSOLETE frame_find_saved_regs (struct frame_info *fi, struct frame_saved_regs *fsr)
522 // OBSOLETE register CORE_ADDR next_addr;
523 // OBSOLETE register CORE_ADDR *saved_regs;
524 // OBSOLETE register int regnum;
525 // OBSOLETE register struct frame_saved_regs *cache_fsr;
526 // OBSOLETE CORE_ADDR ip;
527 // OBSOLETE struct symtab_and_line sal;
528 // OBSOLETE CORE_ADDR limit;
530 // OBSOLETE if (!fi->fsr)
532 // OBSOLETE cache_fsr = (struct frame_saved_regs *)
533 // OBSOLETE frame_obstack_alloc (sizeof (struct frame_saved_regs));
534 // OBSOLETE memset (cache_fsr, '\0', sizeof (struct frame_saved_regs));
535 // OBSOLETE fi->fsr = cache_fsr;
537 // OBSOLETE /* Find the start and end of the function prologue. If the PC
538 // OBSOLETE is in the function prologue, we only consider the part that
539 // OBSOLETE has executed already. */
541 // OBSOLETE ip = get_pc_function_start (fi->pc);
542 // OBSOLETE sal = find_pc_line (ip, 0);
543 // OBSOLETE limit = (sal.end && sal.end < fi->pc) ? sal.end : fi->pc;
545 // OBSOLETE examine_prologue (ip, limit, fi->frame, cache_fsr);
547 // OBSOLETE /* Record the addresses at which the local registers are saved.
548 // OBSOLETE Strictly speaking, we should only do this for non-leaf procedures,
549 // OBSOLETE but no one will ever look at these values if it is a leaf procedure,
550 // OBSOLETE since local registers are always caller-saved. */
552 // OBSOLETE next_addr = (CORE_ADDR) fi->frame;
553 // OBSOLETE saved_regs = cache_fsr->regs;
554 // OBSOLETE for (regnum = R0_REGNUM; regnum <= R15_REGNUM; regnum++)
556 // OBSOLETE *saved_regs++ = next_addr;
557 // OBSOLETE next_addr += 4;
560 // OBSOLETE cache_fsr->regs[FP_REGNUM] = cache_fsr->regs[PFP_REGNUM];
563 // OBSOLETE *fsr = *fi->fsr;
565 // OBSOLETE /* Fetch the value of the sp from memory every time, since it
566 // OBSOLETE is conceivable that it has changed since the cache was flushed.
567 // OBSOLETE This unfortunately undoes much of the savings from caching the
568 // OBSOLETE saved register values. I suggest adding an argument to
569 // OBSOLETE get_frame_saved_regs () specifying the register number we're
570 // OBSOLETE interested in (or -1 for all registers). This would be passed
571 // OBSOLETE through to FRAME_FIND_SAVED_REGS (), permitting more efficient
572 // OBSOLETE computation of saved register addresses (e.g., on the i960,
573 // OBSOLETE we don't have to examine the prologue to find local registers).
574 // OBSOLETE -- markf@wrs.com
575 // OBSOLETE FIXME, we don't need to refetch this, since the cache is cleared
576 // OBSOLETE every time the child process is restarted. If GDB itself
577 // OBSOLETE modifies SP, it has to clear the cache by hand (does it?). -gnu */
579 // OBSOLETE fsr->regs[SP_REGNUM] = read_memory_integer (fsr->regs[SP_REGNUM], 4);
582 // OBSOLETE /* Return the address of the argument block for the frame
583 // OBSOLETE described by FI. Returns 0 if the address is unknown. */
585 // OBSOLETE CORE_ADDR
586 // OBSOLETE frame_args_address (struct frame_info *fi, int must_be_correct)
588 // OBSOLETE struct frame_saved_regs fsr;
589 // OBSOLETE CORE_ADDR ap;
591 // OBSOLETE /* If g14 was saved in the frame by the function prologue code, return
592 // OBSOLETE the saved value. If the frame is current and we are being sloppy,
593 // OBSOLETE return the value of g14. Otherwise, return zero. */
595 // OBSOLETE get_frame_saved_regs (fi, &fsr);
596 // OBSOLETE if (fsr.regs[G14_REGNUM])
597 // OBSOLETE ap = read_memory_integer (fsr.regs[G14_REGNUM], 4);
600 // OBSOLETE if (must_be_correct)
601 // OBSOLETE return 0; /* Don't cache this result */
602 // OBSOLETE if (get_next_frame (fi))
605 // OBSOLETE ap = read_register (G14_REGNUM);
606 // OBSOLETE if (ap == 0)
607 // OBSOLETE ap = fi->frame;
609 // OBSOLETE fi->arg_pointer = ap; /* Cache it for next time */
610 // OBSOLETE return ap;
613 // OBSOLETE /* Return the address of the return struct for the frame
614 // OBSOLETE described by FI. Returns 0 if the address is unknown. */
616 // OBSOLETE CORE_ADDR
617 // OBSOLETE frame_struct_result_address (struct frame_info *fi)
619 // OBSOLETE struct frame_saved_regs fsr;
620 // OBSOLETE CORE_ADDR ap;
622 // OBSOLETE /* If the frame is non-current, check to see if g14 was saved in the
623 // OBSOLETE frame by the function prologue code; return the saved value if so,
624 // OBSOLETE zero otherwise. If the frame is current, return the value of g14.
626 // OBSOLETE FIXME, shouldn't this use the saved value as long as we are past
627 // OBSOLETE the function prologue, and only use the current value if we have
628 // OBSOLETE no saved value and are at TOS? -- gnu@cygnus.com */
630 // OBSOLETE if (get_next_frame (fi))
632 // OBSOLETE get_frame_saved_regs (fi, &fsr);
633 // OBSOLETE if (fsr.regs[G13_REGNUM])
634 // OBSOLETE ap = read_memory_integer (fsr.regs[G13_REGNUM], 4);
639 // OBSOLETE ap = read_register (G13_REGNUM);
641 // OBSOLETE return ap;
644 // OBSOLETE /* Return address to which the currently executing leafproc will return,
645 // OBSOLETE or 0 if IP, the value of the instruction pointer from the currently
646 // OBSOLETE executing function, is not in a leafproc (or if we can't tell if it
649 // OBSOLETE Do this by finding the starting address of the routine in which IP lies.
650 // OBSOLETE If the instruction there is "mov g14, gx" (where x is in [0,7]), this
651 // OBSOLETE is a leafproc and the return address is in register gx. Well, this is
652 // OBSOLETE true unless the return address points at a RET instruction in the current
653 // OBSOLETE procedure, which indicates that we have a 'dual entry' routine that
654 // OBSOLETE has been entered through the CALL entry point. */
656 // OBSOLETE CORE_ADDR
657 // OBSOLETE leafproc_return (CORE_ADDR ip)
659 // OBSOLETE register struct minimal_symbol *msymbol;
662 // OBSOLETE unsigned int insn1, insn2;
663 // OBSOLETE CORE_ADDR return_addr;
665 // OBSOLETE if ((msymbol = lookup_minimal_symbol_by_pc (ip)) != NULL)
667 // OBSOLETE if ((p = strchr (SYMBOL_NAME (msymbol), '.')) && STREQ (p, ".lf"))
669 // OBSOLETE if (next_insn (SYMBOL_VALUE_ADDRESS (msymbol), &insn1, &insn2)
670 // OBSOLETE && (insn1 & 0xff87ffff) == 0x5c80161e /* mov g14, gx */
671 // OBSOLETE && (dst = REG_SRCDST (insn1)) <= G0_REGNUM + 7)
673 // OBSOLETE /* Get the return address. If the "mov g14, gx"
674 // OBSOLETE instruction hasn't been executed yet, read
675 // OBSOLETE the return address from g14; otherwise, read it
676 // OBSOLETE from the register into which g14 was moved. */
678 // OBSOLETE return_addr =
679 // OBSOLETE read_register ((ip == SYMBOL_VALUE_ADDRESS (msymbol))
680 // OBSOLETE ? G14_REGNUM : dst);
682 // OBSOLETE /* We know we are in a leaf procedure, but we don't know
683 // OBSOLETE whether the caller actually did a "bal" to the ".lf"
684 // OBSOLETE entry point, or a normal "call" to the non-leaf entry
685 // OBSOLETE point one instruction before. In the latter case, the
686 // OBSOLETE return address will be the address of a "ret"
687 // OBSOLETE instruction within the procedure itself. We test for
688 // OBSOLETE this below. */
690 // OBSOLETE if (!next_insn (return_addr, &insn1, &insn2)
691 // OBSOLETE || (insn1 & 0xff000000) != 0xa000000 /* ret */
692 // OBSOLETE || lookup_minimal_symbol_by_pc (return_addr) != msymbol)
693 // OBSOLETE return (return_addr);
698 // OBSOLETE return (0);
701 // OBSOLETE /* Immediately after a function call, return the saved pc.
702 // OBSOLETE Can't go through the frames for this because on some machines
703 // OBSOLETE the new frame is not set up until the new function executes
704 // OBSOLETE some instructions.
705 // OBSOLETE On the i960, the frame *is* set up immediately after the call,
706 // OBSOLETE unless the function is a leaf procedure. */
708 // OBSOLETE CORE_ADDR
709 // OBSOLETE saved_pc_after_call (struct frame_info *frame)
711 // OBSOLETE CORE_ADDR saved_pc;
713 // OBSOLETE saved_pc = leafproc_return (get_frame_pc (frame));
714 // OBSOLETE if (!saved_pc)
715 // OBSOLETE saved_pc = FRAME_SAVED_PC (frame);
717 // OBSOLETE return saved_pc;
720 // OBSOLETE /* Discard from the stack the innermost frame,
721 // OBSOLETE restoring all saved registers. */
724 // OBSOLETE i960_pop_frame (void)
726 // OBSOLETE register struct frame_info *current_fi, *prev_fi;
727 // OBSOLETE register int i;
728 // OBSOLETE CORE_ADDR save_addr;
729 // OBSOLETE CORE_ADDR leaf_return_addr;
730 // OBSOLETE struct frame_saved_regs fsr;
731 // OBSOLETE char local_regs_buf[16 * 4];
733 // OBSOLETE current_fi = get_current_frame ();
735 // OBSOLETE /* First, undo what the hardware does when we return.
736 // OBSOLETE If this is a non-leaf procedure, restore local registers from
737 // OBSOLETE the save area in the calling frame. Otherwise, load the return
738 // OBSOLETE address obtained from leafproc_return () into the rip. */
740 // OBSOLETE leaf_return_addr = leafproc_return (current_fi->pc);
741 // OBSOLETE if (!leaf_return_addr)
743 // OBSOLETE /* Non-leaf procedure. Restore local registers, incl IP. */
744 // OBSOLETE prev_fi = get_prev_frame (current_fi);
745 // OBSOLETE read_memory (prev_fi->frame, local_regs_buf, sizeof (local_regs_buf));
746 // OBSOLETE write_register_bytes (REGISTER_BYTE (R0_REGNUM), local_regs_buf,
747 // OBSOLETE sizeof (local_regs_buf));
749 // OBSOLETE /* Restore frame pointer. */
750 // OBSOLETE write_register (FP_REGNUM, prev_fi->frame);
754 // OBSOLETE /* Leaf procedure. Just restore the return address into the IP. */
755 // OBSOLETE write_register (RIP_REGNUM, leaf_return_addr);
758 // OBSOLETE /* Now restore any global regs that the current function had saved. */
759 // OBSOLETE get_frame_saved_regs (current_fi, &fsr);
760 // OBSOLETE for (i = G0_REGNUM; i < G14_REGNUM; i++)
762 // OBSOLETE save_addr = fsr.regs[i];
763 // OBSOLETE if (save_addr != 0)
764 // OBSOLETE write_register (i, read_memory_integer (save_addr, 4));
767 // OBSOLETE /* Flush the frame cache, create a frame for the new innermost frame,
768 // OBSOLETE and make it the current frame. */
770 // OBSOLETE flush_cached_frames ();
773 // OBSOLETE /* Given a 960 stop code (fault or trace), return the signal which
774 // OBSOLETE corresponds. */
776 // OBSOLETE enum target_signal
777 // OBSOLETE i960_fault_to_signal (int fault)
779 // OBSOLETE switch (fault)
782 // OBSOLETE return TARGET_SIGNAL_BUS; /* parallel fault */
784 // OBSOLETE return TARGET_SIGNAL_UNKNOWN;
786 // OBSOLETE return TARGET_SIGNAL_ILL; /* operation fault */
788 // OBSOLETE return TARGET_SIGNAL_FPE; /* arithmetic fault */
790 // OBSOLETE return TARGET_SIGNAL_FPE; /* floating point fault */
792 // OBSOLETE /* constraint fault. This appears not to distinguish between
793 // OBSOLETE a range constraint fault (which should be SIGFPE) and a privileged
794 // OBSOLETE fault (which should be SIGILL). */
796 // OBSOLETE return TARGET_SIGNAL_ILL;
799 // OBSOLETE return TARGET_SIGNAL_SEGV; /* virtual memory fault */
801 // OBSOLETE /* protection fault. This is for an out-of-range argument to
802 // OBSOLETE "calls". I guess it also could be SIGILL. */
804 // OBSOLETE return TARGET_SIGNAL_SEGV;
807 // OBSOLETE return TARGET_SIGNAL_BUS; /* machine fault */
809 // OBSOLETE return TARGET_SIGNAL_BUS; /* structural fault */
810 // OBSOLETE case 0xa:
811 // OBSOLETE return TARGET_SIGNAL_ILL; /* type fault */
812 // OBSOLETE case 0xb:
813 // OBSOLETE return TARGET_SIGNAL_UNKNOWN; /* reserved fault */
814 // OBSOLETE case 0xc:
815 // OBSOLETE return TARGET_SIGNAL_BUS; /* process fault */
816 // OBSOLETE case 0xd:
817 // OBSOLETE return TARGET_SIGNAL_SEGV; /* descriptor fault */
818 // OBSOLETE case 0xe:
819 // OBSOLETE return TARGET_SIGNAL_BUS; /* event fault */
820 // OBSOLETE case 0xf:
821 // OBSOLETE return TARGET_SIGNAL_UNKNOWN; /* reserved fault */
822 // OBSOLETE case 0x10:
823 // OBSOLETE return TARGET_SIGNAL_TRAP; /* single-step trace */
824 // OBSOLETE case 0x11:
825 // OBSOLETE return TARGET_SIGNAL_TRAP; /* branch trace */
826 // OBSOLETE case 0x12:
827 // OBSOLETE return TARGET_SIGNAL_TRAP; /* call trace */
828 // OBSOLETE case 0x13:
829 // OBSOLETE return TARGET_SIGNAL_TRAP; /* return trace */
830 // OBSOLETE case 0x14:
831 // OBSOLETE return TARGET_SIGNAL_TRAP; /* pre-return trace */
832 // OBSOLETE case 0x15:
833 // OBSOLETE return TARGET_SIGNAL_TRAP; /* supervisor call trace */
834 // OBSOLETE case 0x16:
835 // OBSOLETE return TARGET_SIGNAL_TRAP; /* breakpoint trace */
837 // OBSOLETE return TARGET_SIGNAL_UNKNOWN;
841 // OBSOLETE /****************************************/
842 // OBSOLETE /* MEM format */
843 // OBSOLETE /****************************************/
845 // OBSOLETE struct tabent
847 // OBSOLETE char *name;
848 // OBSOLETE char numops;
851 // OBSOLETE /* Return instruction length, either 4 or 8. When NOPRINT is non-zero
852 // OBSOLETE (TRUE), don't output any text. (Actually, as implemented, if NOPRINT
853 // OBSOLETE is 0, abort() is called.) */
855 // OBSOLETE static int
856 // OBSOLETE mem (unsigned long memaddr, unsigned long word1, unsigned long word2,
857 // OBSOLETE int noprint)
859 // OBSOLETE int i, j;
861 // OBSOLETE int mode;
862 // OBSOLETE int offset;
863 // OBSOLETE const char *reg1, *reg2, *reg3;
865 // OBSOLETE /* This lookup table is too sparse to make it worth typing in, but not
866 // OBSOLETE * so large as to make a sparse array necessary. We allocate the
867 // OBSOLETE * table at runtime, initialize all entries to empty, and copy the
868 // OBSOLETE * real ones in from an initialization table.
870 // OBSOLETE * NOTE: In this table, the meaning of 'numops' is:
871 // OBSOLETE * 1: single operand
872 // OBSOLETE * 2: 2 operands, load instruction
873 // OBSOLETE * -2: 2 operands, store instruction
875 // OBSOLETE static struct tabent *mem_tab = NULL;
876 // OBSOLETE /* Opcodes of 0x8X, 9X, aX, bX, and cX must be in the table. */
877 // OBSOLETE #define MEM_MIN 0x80
878 // OBSOLETE #define MEM_MAX 0xcf
879 // OBSOLETE #define MEM_SIZ ((MEM_MAX-MEM_MIN+1) * sizeof(struct tabent))
881 // OBSOLETE static struct
883 // OBSOLETE int opcode;
884 // OBSOLETE char *name;
885 // OBSOLETE char numops;
887 // OBSOLETE mem_init[] =
889 // OBSOLETE 0x80, "ldob", 2,
890 // OBSOLETE 0x82, "stob", -2,
891 // OBSOLETE 0x84, "bx", 1,
892 // OBSOLETE 0x85, "balx", 2,
893 // OBSOLETE 0x86, "callx", 1,
894 // OBSOLETE 0x88, "ldos", 2,
895 // OBSOLETE 0x8a, "stos", -2,
896 // OBSOLETE 0x8c, "lda", 2,
897 // OBSOLETE 0x90, "ld", 2,
898 // OBSOLETE 0x92, "st", -2,
899 // OBSOLETE 0x98, "ldl", 2,
900 // OBSOLETE 0x9a, "stl", -2,
901 // OBSOLETE 0xa0, "ldt", 2,
902 // OBSOLETE 0xa2, "stt", -2,
903 // OBSOLETE 0xb0, "ldq", 2,
904 // OBSOLETE 0xb2, "stq", -2,
905 // OBSOLETE 0xc0, "ldib", 2,
906 // OBSOLETE 0xc2, "stib", -2,
907 // OBSOLETE 0xc8, "ldis", 2,
908 // OBSOLETE 0xca, "stis", -2,
909 // OBSOLETE 0, NULL, 0
912 // OBSOLETE if (mem_tab == NULL)
914 // OBSOLETE mem_tab = (struct tabent *) xmalloc (MEM_SIZ);
915 // OBSOLETE memset (mem_tab, '\0', MEM_SIZ);
916 // OBSOLETE for (i = 0; mem_init[i].opcode != 0; i++)
918 // OBSOLETE j = mem_init[i].opcode - MEM_MIN;
919 // OBSOLETE mem_tab[j].name = mem_init[i].name;
920 // OBSOLETE mem_tab[j].numops = mem_init[i].numops;
924 // OBSOLETE i = ((word1 >> 24) & 0xff) - MEM_MIN;
925 // OBSOLETE mode = (word1 >> 10) & 0xf;
927 // OBSOLETE if ((mem_tab[i].name != NULL) /* Valid instruction */
928 // OBSOLETE && ((mode == 5) || (mode >= 12)))
929 // OBSOLETE { /* With 32-bit displacement */
937 // OBSOLETE if (noprint)
939 // OBSOLETE return len;
941 // OBSOLETE internal_error (__FILE__, __LINE__, "failed internal consistency check");
944 // OBSOLETE /* Read the i960 instruction at 'memaddr' and return the address of
945 // OBSOLETE the next instruction after that, or 0 if 'memaddr' is not the
946 // OBSOLETE address of a valid instruction. The first word of the instruction
947 // OBSOLETE is stored at 'pword1', and the second word, if any, is stored at
948 // OBSOLETE 'pword2'. */
950 // OBSOLETE static CORE_ADDR
951 // OBSOLETE next_insn (CORE_ADDR memaddr, unsigned int *pword1, unsigned int *pword2)
954 // OBSOLETE char buf[8];
956 // OBSOLETE /* Read the two (potential) words of the instruction at once,
957 // OBSOLETE to eliminate the overhead of two calls to read_memory ().
958 // OBSOLETE FIXME: Loses if the first one is readable but the second is not
959 // OBSOLETE (e.g. last word of the segment). */
961 // OBSOLETE read_memory (memaddr, buf, 8);
962 // OBSOLETE *pword1 = extract_unsigned_integer (buf, 4);
963 // OBSOLETE *pword2 = extract_unsigned_integer (buf + 4, 4);
965 // OBSOLETE /* Divide instruction set into classes based on high 4 bits of opcode */
967 // OBSOLETE switch ((*pword1 >> 28) & 0xf)
969 // OBSOLETE case 0x0:
970 // OBSOLETE case 0x1: /* ctrl */
972 // OBSOLETE case 0x2:
973 // OBSOLETE case 0x3: /* cobr */
975 // OBSOLETE case 0x5:
976 // OBSOLETE case 0x6:
977 // OBSOLETE case 0x7: /* reg */
981 // OBSOLETE case 0x8:
982 // OBSOLETE case 0x9:
983 // OBSOLETE case 0xa:
984 // OBSOLETE case 0xb:
985 // OBSOLETE case 0xc:
986 // OBSOLETE len = mem (memaddr, *pword1, *pword2, 1);
989 // OBSOLETE default: /* invalid instruction */
995 // OBSOLETE return memaddr + len;
997 // OBSOLETE return 0;
1000 // OBSOLETE /* 'start_frame' is a variable in the MON960 runtime startup routine
1001 // OBSOLETE that contains the frame pointer of the 'start' routine (the routine
1002 // OBSOLETE that calls 'main'). By reading its contents out of remote memory,
1003 // OBSOLETE we can tell where the frame chain ends: backtraces should halt before
1004 // OBSOLETE they display this frame. */
1007 // OBSOLETE mon960_frame_chain_valid (CORE_ADDR chain, struct frame_info *curframe)
1009 // OBSOLETE struct symbol *sym;
1010 // OBSOLETE struct minimal_symbol *msymbol;
1012 // OBSOLETE /* crtmon960.o is an assembler module that is assumed to be linked
1013 // OBSOLETE * first in an i80960 executable. It contains the true entry point;
1014 // OBSOLETE * it performs startup up initialization and then calls 'main'.
1016 // OBSOLETE * 'sf' is the name of a variable in crtmon960.o that is set
1017 // OBSOLETE * during startup to the address of the first frame.
1019 // OBSOLETE * 'a' is the address of that variable in 80960 memory.
1021 // OBSOLETE static char sf[] = "start_frame";
1022 // OBSOLETE CORE_ADDR a;
1025 // OBSOLETE chain &= ~0x3f; /* Zero low 6 bits because previous frame pointers
1026 // OBSOLETE contain return status info in them. */
1027 // OBSOLETE if (chain == 0)
1029 // OBSOLETE return 0;
1032 // OBSOLETE sym = lookup_symbol (sf, 0, VAR_NAMESPACE, (int *) NULL,
1033 // OBSOLETE (struct symtab **) NULL);
1034 // OBSOLETE if (sym != 0)
1036 // OBSOLETE a = SYMBOL_VALUE (sym);
1040 // OBSOLETE msymbol = lookup_minimal_symbol (sf, NULL, NULL);
1041 // OBSOLETE if (msymbol == NULL)
1042 // OBSOLETE return 0;
1043 // OBSOLETE a = SYMBOL_VALUE_ADDRESS (msymbol);
1046 // OBSOLETE return (chain != read_memory_integer (a, 4));
1051 // OBSOLETE _initialize_i960_tdep (void)
1053 // OBSOLETE check_host ();
1055 // OBSOLETE tm_print_insn = print_insn_i960;
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