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c906108c | 1 | /* Parameters for execution on any Hewlett-Packard PA-RISC machine. |
d9fcf2fb | 2 | Copyright 1986, 1987, 1989-1993, 1995, 1999, 2000 Free Software Foundation, Inc. |
c906108c SS |
3 | |
4 | Contributed by the Center for Software Science at the | |
5 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b JM |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
23 | |
24 | /* Forward declarations of some types we use in prototypes */ | |
25 | ||
c906108c SS |
26 | struct frame_info; |
27 | struct frame_saved_regs; | |
28 | struct value; | |
29 | struct type; | |
30 | struct inferior_status; | |
c906108c SS |
31 | |
32 | /* Target system byte order. */ | |
33 | ||
34 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
35 | ||
36 | /* By default assume we don't have to worry about software floating point. */ | |
37 | #ifndef SOFT_FLOAT | |
38 | #define SOFT_FLOAT 0 | |
39 | #endif | |
40 | ||
41 | /* Get at various relevent fields of an instruction word. */ | |
42 | ||
43 | #define MASK_5 0x1f | |
44 | #define MASK_11 0x7ff | |
45 | #define MASK_14 0x3fff | |
46 | #define MASK_21 0x1fffff | |
47 | ||
48 | /* This macro gets bit fields using HP's numbering (MSB = 0) */ | |
49 | #ifndef GET_FIELD | |
50 | #define GET_FIELD(X, FROM, TO) \ | |
51 | ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1)) | |
52 | #endif | |
53 | ||
54 | /* Watch out for NaNs */ | |
55 | ||
7355ddba | 56 | #define IEEE_FLOAT (1) |
c906108c SS |
57 | |
58 | /* On the PA, any pass-by-value structure > 8 bytes is actually | |
59 | passed via a pointer regardless of its type or the compiler | |
60 | used. */ | |
61 | ||
62 | #define REG_STRUCT_HAS_ADDR(gcc_p,type) \ | |
63 | (TYPE_LENGTH (type) > 8) | |
64 | ||
65 | /* Offset from address of function to start of its code. | |
66 | Zero on most machines. */ | |
67 | ||
68 | #define FUNCTION_START_OFFSET 0 | |
c5aa993b | 69 | |
c906108c SS |
70 | /* Advance PC across any function entry prologue instructions |
71 | to reach some "real" code. */ | |
72 | ||
a14ed312 | 73 | extern CORE_ADDR hppa_skip_prologue (CORE_ADDR); |
b83266a0 | 74 | #define SKIP_PROLOGUE(pc) (hppa_skip_prologue (pc)) |
c906108c SS |
75 | |
76 | /* If PC is in some function-call trampoline code, return the PC | |
77 | where the function itself actually starts. If not, return NULL. */ | |
78 | ||
79 | #define SKIP_TRAMPOLINE_CODE(pc) skip_trampoline_code (pc, NULL) | |
a14ed312 | 80 | extern CORE_ADDR skip_trampoline_code (CORE_ADDR, char *); |
c906108c SS |
81 | |
82 | /* Return non-zero if we are in an appropriate trampoline. */ | |
83 | ||
84 | #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \ | |
85 | in_solib_call_trampoline (pc, name) | |
a14ed312 | 86 | extern int in_solib_call_trampoline (CORE_ADDR, char *); |
c906108c SS |
87 | |
88 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \ | |
89 | in_solib_return_trampoline (pc, name) | |
a14ed312 | 90 | extern int in_solib_return_trampoline (CORE_ADDR, char *); |
c906108c SS |
91 | |
92 | /* Immediately after a function call, return the saved pc. | |
93 | Can't go through the frames for this because on some machines | |
94 | the new frame is not set up until the new function executes | |
95 | some instructions. */ | |
96 | ||
97 | #undef SAVED_PC_AFTER_CALL | |
98 | #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call (frame) | |
a14ed312 | 99 | extern CORE_ADDR saved_pc_after_call (struct frame_info *); |
c906108c SS |
100 | |
101 | /* Stack grows upward */ | |
102 | #define INNER_THAN(lhs,rhs) ((lhs) > (rhs)) | |
103 | ||
104 | /* elz: adjust the quantity to the next highest value which is 64-bit aligned. | |
105 | This is used in valops.c, when the sp is adjusted. | |
c5aa993b | 106 | On hppa the sp must always be kept 64-bit aligned */ |
c906108c SS |
107 | |
108 | #define STACK_ALIGN(arg) ( ((arg)%8) ? (((arg)+7)&-8) : (arg)) | |
c5aa993b | 109 | #define NO_EXTRA_ALIGNMENT_NEEDED 1 |
c906108c SS |
110 | |
111 | /* Sequence of bytes for breakpoint instruction. */ | |
112 | ||
113 | #define BREAKPOINT {0x00, 0x01, 0x00, 0x04} | |
114 | #define BREAKPOINT32 0x10004 | |
115 | ||
116 | /* Amount PC must be decremented by after a breakpoint. | |
117 | This is often the number of bytes in BREAKPOINT | |
118 | but not always. | |
119 | ||
120 | Not on the PA-RISC */ | |
121 | ||
122 | #define DECR_PC_AFTER_BREAK 0 | |
123 | ||
124 | /* Sometimes we may pluck out a minimal symbol that has a negative | |
125 | address. | |
126 | ||
127 | An example of this occurs when an a.out is linked against a foo.sl. | |
128 | The foo.sl defines a global bar(), and the a.out declares a signature | |
129 | for bar(). However, the a.out doesn't directly call bar(), but passes | |
130 | its address in another call. | |
131 | ||
132 | If you have this scenario and attempt to "break bar" before running, | |
133 | gdb will find a minimal symbol for bar() in the a.out. But that | |
134 | symbol's address will be negative. What this appears to denote is | |
135 | an index backwards from the base of the procedure linkage table (PLT) | |
136 | into the data linkage table (DLT), the end of which is contiguous | |
137 | with the start of the PLT. This is clearly not a valid address for | |
138 | us to set a breakpoint on. | |
139 | ||
140 | Note that one must be careful in how one checks for a negative address. | |
141 | 0xc0000000 is a legitimate address of something in a shared text | |
142 | segment, for example. Since I don't know what the possible range | |
143 | is of these "really, truly negative" addresses that come from the | |
144 | minimal symbols, I'm resorting to the gross hack of checking the | |
145 | top byte of the address for all 1's. Sigh. | |
c5aa993b | 146 | */ |
c906108c SS |
147 | #define PC_REQUIRES_RUN_BEFORE_USE(pc) \ |
148 | (! target_has_stack && (pc & 0xFF000000)) | |
149 | ||
c5aa993b | 150 | /* return instruction is bv r0(rp) or bv,n r0(rp) */ |
c906108c SS |
151 | |
152 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 4) | 0x2) == 0xE840C002) | |
153 | ||
154 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
155 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
156 | real way to know how big a register is. */ | |
157 | ||
158 | #define REGISTER_SIZE 4 | |
159 | ||
160 | /* Number of machine registers */ | |
161 | ||
162 | #define NUM_REGS 128 | |
163 | ||
164 | /* Initializer for an array of names of registers. | |
165 | There should be NUM_REGS strings in this initializer. | |
166 | They are in rows of eight entries */ | |
167 | ||
168 | #define REGISTER_NAMES \ | |
169 | {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", \ | |
170 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \ | |
171 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \ | |
172 | "r24", "r25", "r26", "dp", "ret0", "ret1", "sp", "r31", \ | |
173 | "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", "eiem", "iir", "isr", \ | |
174 | "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", "sr3", \ | |
175 | "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", \ | |
176 | "cr13", "cr24", "cr25", "cr26", "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",\ | |
177 | "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \ | |
178 | "fr4", "fr4R", "fr5", "fr5R", "fr6", "fr6R", "fr7", "fr7R", \ | |
179 | "fr8", "fr8R", "fr9", "fr9R", "fr10", "fr10R", "fr11", "fr11R", \ | |
180 | "fr12", "fr12R", "fr13", "fr13R", "fr14", "fr14R", "fr15", "fr15R", \ | |
181 | "fr16", "fr16R", "fr17", "fr17R", "fr18", "fr18R", "fr19", "fr19R", \ | |
182 | "fr20", "fr20R", "fr21", "fr21R", "fr22", "fr22R", "fr23", "fr23R", \ | |
183 | "fr24", "fr24R", "fr25", "fr25R", "fr26", "fr26R", "fr27", "fr27R", \ | |
184 | "fr28", "fr28R", "fr29", "fr29R", "fr30", "fr30R", "fr31", "fr31R"} | |
185 | ||
186 | /* Register numbers of various important registers. | |
187 | Note that some of these values are "real" register numbers, | |
188 | and correspond to the general registers of the machine, | |
189 | and some are "phony" register numbers which are too large | |
190 | to be actual register numbers as far as the user is concerned | |
191 | but do serve to get the desired values when passed to read_register. */ | |
192 | ||
193 | #define R0_REGNUM 0 /* Doesn't actually exist, used as base for | |
194 | other r registers. */ | |
195 | #define FLAGS_REGNUM 0 /* Various status flags */ | |
196 | #define RP_REGNUM 2 /* return pointer */ | |
197 | #define FP_REGNUM 3 /* Contains address of executing stack */ | |
198 | /* frame */ | |
199 | #define SP_REGNUM 30 /* Contains address of top of stack */ | |
200 | #define SAR_REGNUM 32 /* Shift Amount Register */ | |
201 | #define IPSW_REGNUM 41 /* Interrupt Processor Status Word */ | |
202 | #define PCOQ_HEAD_REGNUM 33 /* instruction offset queue head */ | |
203 | #define PCSQ_HEAD_REGNUM 34 /* instruction space queue head */ | |
204 | #define PCOQ_TAIL_REGNUM 35 /* instruction offset queue tail */ | |
205 | #define PCSQ_TAIL_REGNUM 36 /* instruction space queue tail */ | |
206 | #define EIEM_REGNUM 37 /* External Interrupt Enable Mask */ | |
207 | #define IIR_REGNUM 38 /* Interrupt Instruction Register */ | |
208 | #define IOR_REGNUM 40 /* Interrupt Offset Register */ | |
209 | #define SR4_REGNUM 43 /* space register 4 */ | |
210 | #define RCR_REGNUM 51 /* Recover Counter (also known as cr0) */ | |
211 | #define CCR_REGNUM 54 /* Coprocessor Configuration Register */ | |
212 | #define TR0_REGNUM 57 /* Temporary Registers (cr24 -> cr31) */ | |
c5aa993b JM |
213 | #define CR27_REGNUM 60 /* Base register for thread-local storage, cr27 */ |
214 | #define FP0_REGNUM 64 /* floating point reg. 0 (fspr) */ | |
c906108c SS |
215 | #define FP4_REGNUM 72 |
216 | ||
c5aa993b JM |
217 | #define ARG0_REGNUM 26 /* The first argument of a callee. */ |
218 | #define ARG1_REGNUM 25 /* The second argument of a callee. */ | |
219 | #define ARG2_REGNUM 24 /* The third argument of a callee. */ | |
220 | #define ARG3_REGNUM 23 /* The fourth argument of a callee. */ | |
c906108c SS |
221 | |
222 | /* compatibility with the rest of gdb. */ | |
223 | #define PC_REGNUM PCOQ_HEAD_REGNUM | |
224 | #define NPC_REGNUM PCOQ_TAIL_REGNUM | |
225 | ||
226 | /* | |
227 | * Processor Status Word Masks | |
228 | */ | |
229 | ||
c5aa993b JM |
230 | #define PSW_T 0x01000000 /* Taken Branch Trap Enable */ |
231 | #define PSW_H 0x00800000 /* Higher-Privilege Transfer Trap Enable */ | |
232 | #define PSW_L 0x00400000 /* Lower-Privilege Transfer Trap Enable */ | |
233 | #define PSW_N 0x00200000 /* PC Queue Front Instruction Nullified */ | |
234 | #define PSW_X 0x00100000 /* Data Memory Break Disable */ | |
235 | #define PSW_B 0x00080000 /* Taken Branch in Previous Cycle */ | |
236 | #define PSW_C 0x00040000 /* Code Address Translation Enable */ | |
237 | #define PSW_V 0x00020000 /* Divide Step Correction */ | |
238 | #define PSW_M 0x00010000 /* High-Priority Machine Check Disable */ | |
239 | #define PSW_CB 0x0000ff00 /* Carry/Borrow Bits */ | |
240 | #define PSW_R 0x00000010 /* Recovery Counter Enable */ | |
241 | #define PSW_Q 0x00000008 /* Interruption State Collection Enable */ | |
242 | #define PSW_P 0x00000004 /* Protection ID Validation Enable */ | |
243 | #define PSW_D 0x00000002 /* Data Address Translation Enable */ | |
244 | #define PSW_I 0x00000001 /* External, Power Failure, Low-Priority */ | |
245 | /* Machine Check Interruption Enable */ | |
c906108c SS |
246 | |
247 | /* When fetching register values from an inferior or a core file, | |
248 | clean them up using this macro. BUF is a char pointer to | |
249 | the raw value of the register in the registers[] array. */ | |
250 | ||
251 | #define CLEAN_UP_REGISTER_VALUE(regno, buf) \ | |
252 | do { \ | |
253 | if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \ | |
7be570e7 | 254 | (buf)[sizeof(CORE_ADDR) -1] &= ~0x3; \ |
c906108c SS |
255 | } while (0) |
256 | ||
257 | /* Define DO_REGISTERS_INFO() to do machine-specific formatting | |
258 | of register dumps. */ | |
259 | ||
260 | #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp) | |
a14ed312 | 261 | extern void pa_do_registers_info (int, int); |
c906108c SS |
262 | |
263 | #if 0 | |
264 | #define STRCAT_REGISTER(regnum, fpregs, stream, precision) pa_do_strcat_registers_info (regnum, fpregs, stream, precision) | |
d9fcf2fb | 265 | extern void pa_do_strcat_registers_info (int, int, struct ui_file *, enum precision_type); |
c906108c SS |
266 | #endif |
267 | ||
268 | /* PA specific macro to see if the current instruction is nullified. */ | |
269 | #ifndef INSTRUCTION_NULLIFIED | |
270 | #define INSTRUCTION_NULLIFIED \ | |
271 | (((int)read_register (IPSW_REGNUM) & 0x00200000) && \ | |
272 | !((int)read_register (FLAGS_REGNUM) & 0x2)) | |
273 | #endif | |
274 | ||
275 | /* Number of bytes of storage in the actual machine representation | |
276 | for register N. On the PA-RISC, all regs are 4 bytes, including | |
277 | the FP registers (they're accessed as two 4 byte halves). */ | |
278 | ||
279 | #define REGISTER_RAW_SIZE(N) 4 | |
280 | ||
281 | /* Total amount of space needed to store our copies of the machine's | |
282 | register state, the array `registers'. */ | |
283 | #define REGISTER_BYTES (NUM_REGS * 4) | |
284 | ||
285 | /* Index within `registers' of the first byte of the space for | |
286 | register N. */ | |
287 | ||
288 | #define REGISTER_BYTE(N) (N) * 4 | |
289 | ||
290 | /* Number of bytes of storage in the program's representation | |
291 | for register N. */ | |
292 | ||
293 | #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N) | |
294 | ||
295 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
296 | ||
297 | #define MAX_REGISTER_RAW_SIZE 4 | |
298 | ||
299 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
300 | ||
301 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
302 | ||
303 | /* Return the GDB type object for the "standard" data type | |
304 | of data in register N. */ | |
305 | ||
306 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
307 | ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_float) | |
308 | ||
309 | /* Store the address of the place in which to copy the structure the | |
310 | subroutine will return. This is called from call_function. */ | |
311 | ||
312 | #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); } | |
313 | ||
314 | /* Extract from an array REGBUF containing the (raw) register state | |
315 | a function return value of type TYPE, and copy that, in virtual format, | |
316 | into VALBUF. | |
317 | ||
318 | elz: changed what to return when length is > 4: the stored result is | |
319 | in register 28 and in register 29, with the lower order word being in reg 29, | |
320 | so we must start reading it from somehere in the middle of reg28 | |
321 | ||
322 | FIXME: Not sure what to do for soft float here. */ | |
323 | ||
324 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
325 | { \ | |
326 | if (TYPE_CODE (TYPE) == TYPE_CODE_FLT && !SOFT_FLOAT) \ | |
327 | memcpy ((VALBUF), \ | |
328 | ((char *)(REGBUF)) + REGISTER_BYTE (FP4_REGNUM), \ | |
329 | TYPE_LENGTH (TYPE)); \ | |
330 | else \ | |
331 | memcpy ((VALBUF), \ | |
332 | (char *)(REGBUF) + REGISTER_BYTE (28) + \ | |
333 | (TYPE_LENGTH (TYPE) > 4 ? (8 - TYPE_LENGTH (TYPE)) : (4 - TYPE_LENGTH (TYPE))), \ | |
334 | TYPE_LENGTH (TYPE)); \ | |
335 | } | |
336 | ||
337 | ||
338 | /* elz: decide whether the function returning a value of type type | |
339 | will put it on the stack or in the registers. | |
340 | The pa calling convention says that: | |
341 | register 28 (called ret0 by gdb) contains any ASCII char, | |
342 | and any non_floating point value up to 32-bits. | |
343 | reg 28 and 29 contain non-floating point up tp 64 bits and larger | |
344 | than 32 bits. (higer order word in reg 28). | |
345 | fr4: floating point up to 64 bits | |
346 | sr1: space identifier (32-bit) | |
347 | stack: any lager than 64-bit, with the address in r28 | |
c5aa993b | 348 | */ |
c906108c SS |
349 | extern use_struct_convention_fn hppa_use_struct_convention; |
350 | #define USE_STRUCT_CONVENTION(gcc_p,type) hppa_use_struct_convention (gcc_p,type) | |
351 | ||
352 | /* Write into appropriate registers a function return value | |
353 | of type TYPE, given in virtual format. | |
354 | ||
355 | For software floating point the return value goes into the integer | |
356 | registers. But we don't have any flag to key this on, so we always | |
357 | store the value into the integer registers, and if it's a float value, | |
358 | then we put it in the float registers too. */ | |
359 | ||
360 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
361 | write_register_bytes (REGISTER_BYTE (28),(VALBUF), TYPE_LENGTH (TYPE)) ; \ | |
362 | if (!SOFT_FLOAT) \ | |
363 | write_register_bytes ((TYPE_CODE(TYPE) == TYPE_CODE_FLT \ | |
364 | ? REGISTER_BYTE (FP4_REGNUM) \ | |
365 | : REGISTER_BYTE (28)), \ | |
366 | (VALBUF), TYPE_LENGTH (TYPE)) | |
367 | ||
368 | /* Extract from an array REGBUF containing the (raw) register state | |
369 | the address in which a function should return its structure value, | |
370 | as a CORE_ADDR (or an expression that can be used as one). */ | |
371 | ||
372 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ | |
373 | (*(int *)((REGBUF) + REGISTER_BYTE (28))) | |
374 | ||
375 | /* elz: Return a large value, which is stored on the stack at addr. | |
376 | This is defined only for the hppa, at this moment. | |
377 | The above macro EXTRACT_STRUCT_VALUE_ADDRESS is not called anymore, | |
378 | because it assumes that on exit from a called function which returns | |
379 | a large structure on the stack, the address of the ret structure is | |
380 | still in register 28. Unfortunately this register is usually overwritten | |
381 | by the called function itself, on hppa. This is specified in the calling | |
382 | convention doc. As far as I know, the only way to get the return value | |
383 | is to have the caller tell us where it told the callee to put it, rather | |
384 | than have the callee tell us. | |
c5aa993b | 385 | */ |
c906108c SS |
386 | #define VALUE_RETURNED_FROM_STACK(valtype,addr) \ |
387 | hppa_value_returned_from_stack (valtype, addr) | |
388 | ||
389 | /* | |
390 | * This macro defines the register numbers (from REGISTER_NAMES) that | |
391 | * are effectively unavailable to the user through ptrace(). It allows | |
392 | * us to include the whole register set in REGISTER_NAMES (inorder to | |
393 | * better support remote debugging). If it is used in | |
394 | * fetch/store_inferior_registers() gdb will not complain about I/O errors | |
395 | * on fetching these registers. If all registers in REGISTER_NAMES | |
396 | * are available, then return false (0). | |
397 | */ | |
398 | ||
399 | #define CANNOT_STORE_REGISTER(regno) \ | |
400 | ((regno) == 0) || \ | |
401 | ((regno) == PCSQ_HEAD_REGNUM) || \ | |
402 | ((regno) >= PCSQ_TAIL_REGNUM && (regno) < IPSW_REGNUM) || \ | |
403 | ((regno) > IPSW_REGNUM && (regno) < FP4_REGNUM) | |
404 | ||
405 | #define INIT_EXTRA_FRAME_INFO(fromleaf, frame) init_extra_frame_info (fromleaf, frame) | |
a14ed312 | 406 | extern void init_extra_frame_info (int, struct frame_info *); |
c906108c SS |
407 | |
408 | /* Describe the pointer in each stack frame to the previous stack frame | |
409 | (its caller). */ | |
410 | ||
411 | /* FRAME_CHAIN takes a frame's nominal address | |
412 | and produces the frame's chain-pointer. | |
413 | ||
414 | FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address | |
415 | and produces the nominal address of the caller frame. | |
416 | ||
417 | However, if FRAME_CHAIN_VALID returns zero, | |
418 | it means the given frame is the outermost one and has no caller. | |
419 | In that case, FRAME_CHAIN_COMBINE is not used. */ | |
420 | ||
421 | /* In the case of the PA-RISC, the frame's nominal address | |
422 | is the address of a 4-byte word containing the calling frame's | |
423 | address (previous FP). */ | |
424 | ||
425 | #define FRAME_CHAIN(thisframe) frame_chain (thisframe) | |
a14ed312 | 426 | extern CORE_ADDR frame_chain (struct frame_info *); |
c906108c | 427 | |
a14ed312 | 428 | extern int hppa_frame_chain_valid (CORE_ADDR, struct frame_info *); |
c906108c SS |
429 | #define FRAME_CHAIN_VALID(chain, thisframe) hppa_frame_chain_valid (chain, thisframe) |
430 | ||
431 | #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) | |
432 | ||
433 | /* Define other aspects of the stack frame. */ | |
434 | ||
435 | /* A macro that tells us whether the function invocation represented | |
436 | by FI does not have a frame on the stack associated with it. If it | |
437 | does not, FRAMELESS is set to 1, else 0. */ | |
392a587b JM |
438 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
439 | (frameless_function_invocation (FI)) | |
a14ed312 | 440 | extern int frameless_function_invocation (struct frame_info *); |
c906108c | 441 | |
a14ed312 | 442 | extern CORE_ADDR hppa_frame_saved_pc (struct frame_info *frame); |
c906108c SS |
443 | #define FRAME_SAVED_PC(FRAME) hppa_frame_saved_pc (FRAME) |
444 | ||
445 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
446 | ||
447 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
448 | /* Set VAL to the number of args passed to frame described by FI. | |
449 | Can set VAL to -1, meaning no way to tell. */ | |
450 | ||
451 | /* We can't tell how many args there are | |
452 | now that the C compiler delays popping them. */ | |
392a587b | 453 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
454 | |
455 | /* Return number of bytes at start of arglist that are not really args. */ | |
456 | ||
457 | #define FRAME_ARGS_SKIP 0 | |
458 | ||
459 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
460 | hppa_frame_find_saved_regs (frame_info, &frame_saved_regs) | |
461 | extern void | |
a14ed312 | 462 | hppa_frame_find_saved_regs (struct frame_info *, struct frame_saved_regs *); |
c906108c | 463 | \f |
c5aa993b | 464 | |
c906108c SS |
465 | /* Things needed for making the inferior call functions. */ |
466 | ||
467 | /* Push an empty stack frame, to record the current PC, etc. */ | |
468 | ||
7a292a7a | 469 | #define PUSH_DUMMY_FRAME push_dummy_frame (inf_status) |
a14ed312 | 470 | extern void push_dummy_frame (struct inferior_status *); |
c906108c SS |
471 | |
472 | /* Discard from the stack the innermost frame, | |
473 | restoring all saved registers. */ | |
474 | #define POP_FRAME hppa_pop_frame () | |
a14ed312 | 475 | extern void hppa_pop_frame (void); |
c906108c SS |
476 | |
477 | #define INSTRUCTION_SIZE 4 | |
478 | ||
479 | #ifndef PA_LEVEL_0 | |
480 | ||
481 | /* Non-level zero PA's have space registers (but they don't always have | |
482 | floating-point, do they???? */ | |
483 | ||
484 | /* This sequence of words is the instructions | |
485 | ||
c5aa993b JM |
486 | ; Call stack frame has already been built by gdb. Since we could be calling |
487 | ; a varargs function, and we do not have the benefit of a stub to put things in | |
488 | ; the right place, we load the first 4 word of arguments into both the general | |
489 | ; and fp registers. | |
490 | call_dummy | |
491 | ldw -36(sp), arg0 | |
492 | ldw -40(sp), arg1 | |
493 | ldw -44(sp), arg2 | |
494 | ldw -48(sp), arg3 | |
495 | ldo -36(sp), r1 | |
496 | fldws 0(0, r1), fr4 | |
497 | fldds -4(0, r1), fr5 | |
498 | fldws -8(0, r1), fr6 | |
499 | fldds -12(0, r1), fr7 | |
500 | ldil 0, r22 ; FUNC_LDIL_OFFSET must point here | |
501 | ldo 0(r22), r22 ; FUNC_LDO_OFFSET must point here | |
502 | ldsid (0,r22), r4 | |
503 | ldil 0, r1 ; SR4EXPORT_LDIL_OFFSET must point here | |
504 | ldo 0(r1), r1 ; SR4EXPORT_LDO_OFFSET must point here | |
505 | ldsid (0,r1), r20 | |
506 | combt,=,n r4, r20, text_space ; If target is in data space, do a | |
507 | ble 0(sr5, r22) ; "normal" procedure call | |
508 | copy r31, r2 | |
509 | break 4, 8 | |
510 | mtsp r21, sr0 | |
511 | ble,n 0(sr0, r22) | |
512 | text_space ; Otherwise, go through _sr4export, | |
513 | ble (sr4, r1) ; which will return back here. | |
514 | stw r31,-24(r30) | |
515 | break 4, 8 | |
516 | mtsp r21, sr0 | |
517 | ble,n 0(sr0, r22) | |
518 | nop ; To avoid kernel bugs | |
519 | nop ; and keep the dummy 8 byte aligned | |
c906108c SS |
520 | |
521 | The dummy decides if the target is in text space or data space. If | |
522 | it's in data space, there's no problem because the target can | |
523 | return back to the dummy. However, if the target is in text space, | |
524 | the dummy calls the secret, undocumented routine _sr4export, which | |
525 | calls a function in text space and can return to any space. Instead | |
526 | of including fake instructions to represent saved registers, we | |
527 | know that the frame is associated with the call dummy and treat it | |
528 | specially. | |
529 | ||
530 | The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1 | |
531 | kernels. If the memory at the location pointed to by the PC is | |
532 | 0xffffffff then a ptrace step call will fail (even if the instruction | |
533 | is nullified). | |
534 | ||
535 | The code to pop a dummy frame single steps three instructions | |
536 | starting with the last mtsp. This includes the nullified "instruction" | |
537 | following the ble (which is uninitialized junk). If the | |
538 | "instruction" following the last BLE is 0xffffffff, then the ptrace | |
539 | will fail and the dummy frame is not correctly popped. | |
540 | ||
541 | By placing a NOP in the delay slot of the BLE instruction we can be | |
542 | sure that we never try to execute a 0xffffffff instruction and | |
543 | avoid the kernel bug. The second NOP is needed to keep the call | |
544 | dummy 8 byte aligned. */ | |
545 | ||
546 | /* Define offsets into the call dummy for the target function address */ | |
547 | #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9) | |
548 | #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10) | |
549 | ||
550 | /* Define offsets into the call dummy for the _sr4export address */ | |
551 | #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12) | |
552 | #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13) | |
553 | ||
554 | #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\ | |
555 | 0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\ | |
556 | 0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\ | |
557 | 0x20200000, 0x34210000, 0x002010b4, 0x82842022,\ | |
558 | 0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\ | |
559 | 0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\ | |
560 | 0x00151820, 0xe6c00002, 0x08000240, 0x08000240} | |
561 | ||
562 | #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28) | |
7be570e7 | 563 | #define REG_PARM_STACK_SPACE 16 |
c906108c SS |
564 | |
565 | #else /* defined PA_LEVEL_0 */ | |
566 | ||
567 | /* This is the call dummy for a level 0 PA. Level 0's don't have space | |
568 | registers (or floating point??), so we skip all that inter-space call stuff, | |
569 | and avoid touching the fp regs. | |
570 | ||
c5aa993b JM |
571 | call_dummy |
572 | ||
573 | ldw -36(%sp), %arg0 | |
574 | ldw -40(%sp), %arg1 | |
575 | ldw -44(%sp), %arg2 | |
576 | ldw -48(%sp), %arg3 | |
577 | ldil 0, %r31 ; FUNC_LDIL_OFFSET must point here | |
578 | ldo 0(%r31), %r31 ; FUNC_LDO_OFFSET must point here | |
579 | ble 0(%sr0, %r31) | |
580 | copy %r31, %r2 | |
581 | break 4, 8 | |
582 | nop ; restore_pc_queue expects these | |
583 | bv,n 0(%r22) ; instructions to be here... | |
584 | nop | |
585 | */ | |
c906108c SS |
586 | |
587 | /* Define offsets into the call dummy for the target function address */ | |
588 | #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4) | |
589 | #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5) | |
590 | ||
591 | #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\ | |
592 | 0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\ | |
593 | 0x00010004, 0x08000240, 0xeac0c002, 0x08000240} | |
594 | ||
595 | #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12) | |
596 | ||
597 | #endif | |
598 | ||
599 | #define CALL_DUMMY_START_OFFSET 0 | |
600 | ||
601 | /* If we've reached a trap instruction within the call dummy, then | |
602 | we'll consider that to mean that we've reached the call dummy's | |
603 | end after its successful completion. */ | |
604 | #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \ | |
605 | (PC_IN_CALL_DUMMY((pc), (sp), (frame_address)) && \ | |
606 | (read_memory_integer((pc), 4) == BREAKPOINT32)) | |
607 | ||
608 | /* | |
609 | * Insert the specified number of args and function address | |
610 | * into a call sequence of the above form stored at DUMMYNAME. | |
611 | * | |
612 | * On the hppa we need to call the stack dummy through $$dyncall. | |
613 | * Therefore our version of FIX_CALL_DUMMY takes an extra argument, | |
614 | * real_pc, which is the location where gdb should start up the | |
615 | * inferior to do the function call. | |
616 | */ | |
617 | ||
618 | #define FIX_CALL_DUMMY hppa_fix_call_dummy | |
619 | ||
620 | extern CORE_ADDR | |
a14ed312 KB |
621 | hppa_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR, int, |
622 | struct value **, struct type *, int); | |
c906108c SS |
623 | |
624 | #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ | |
392a587b | 625 | (hppa_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))) |
c906108c | 626 | extern CORE_ADDR |
a14ed312 | 627 | hppa_push_arguments (int, struct value **, CORE_ADDR, int, CORE_ADDR); |
c906108c SS |
628 | \f |
629 | /* The low two bits of the PC on the PA contain the privilege level. Some | |
630 | genius implementing a (non-GCC) compiler apparently decided this means | |
631 | that "addresses" in a text section therefore include a privilege level, | |
632 | and thus symbol tables should contain these bits. This seems like a | |
633 | bonehead thing to do--anyway, it seems to work for our purposes to just | |
634 | ignore those bits. */ | |
635 | #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x3) | |
636 | ||
637 | #define GDB_TARGET_IS_HPPA | |
638 | ||
639 | #define BELIEVE_PCC_PROMOTION 1 | |
640 | ||
641 | /* | |
642 | * Unwind table and descriptor. | |
643 | */ | |
644 | ||
c5aa993b JM |
645 | struct unwind_table_entry |
646 | { | |
7be570e7 JM |
647 | CORE_ADDR region_start; |
648 | CORE_ADDR region_end; | |
c5aa993b JM |
649 | |
650 | unsigned int Cannot_unwind:1; /* 0 */ | |
651 | unsigned int Millicode:1; /* 1 */ | |
652 | unsigned int Millicode_save_sr0:1; /* 2 */ | |
653 | unsigned int Region_description:2; /* 3..4 */ | |
654 | unsigned int reserved1:1; /* 5 */ | |
655 | unsigned int Entry_SR:1; /* 6 */ | |
656 | unsigned int Entry_FR:4; /* number saved *//* 7..10 */ | |
657 | unsigned int Entry_GR:5; /* number saved *//* 11..15 */ | |
658 | unsigned int Args_stored:1; /* 16 */ | |
659 | unsigned int Variable_Frame:1; /* 17 */ | |
660 | unsigned int Separate_Package_Body:1; /* 18 */ | |
661 | unsigned int Frame_Extension_Millicode:1; /* 19 */ | |
662 | unsigned int Stack_Overflow_Check:1; /* 20 */ | |
663 | unsigned int Two_Instruction_SP_Increment:1; /* 21 */ | |
664 | unsigned int Ada_Region:1; /* 22 */ | |
665 | unsigned int cxx_info:1; /* 23 */ | |
666 | unsigned int cxx_try_catch:1; /* 24 */ | |
667 | unsigned int sched_entry_seq:1; /* 25 */ | |
668 | unsigned int reserved2:1; /* 26 */ | |
669 | unsigned int Save_SP:1; /* 27 */ | |
670 | unsigned int Save_RP:1; /* 28 */ | |
671 | unsigned int Save_MRP_in_frame:1; /* 29 */ | |
672 | unsigned int extn_ptr_defined:1; /* 30 */ | |
673 | unsigned int Cleanup_defined:1; /* 31 */ | |
674 | ||
675 | unsigned int MPE_XL_interrupt_marker:1; /* 0 */ | |
676 | unsigned int HP_UX_interrupt_marker:1; /* 1 */ | |
677 | unsigned int Large_frame:1; /* 2 */ | |
678 | unsigned int Pseudo_SP_Set:1; /* 3 */ | |
679 | unsigned int reserved4:1; /* 4 */ | |
680 | unsigned int Total_frame_size:27; /* 5..31 */ | |
681 | ||
682 | /* This is *NOT* part of an actual unwind_descriptor in an object | |
683 | file. It is *ONLY* part of the "internalized" descriptors that | |
684 | we create from those in a file. | |
c906108c | 685 | */ |
c5aa993b JM |
686 | struct |
687 | { | |
688 | unsigned int stub_type:4; /* 0..3 */ | |
689 | unsigned int padding:28; /* 4..31 */ | |
690 | } | |
691 | stub_unwind; | |
692 | }; | |
c906108c SS |
693 | |
694 | /* HP linkers also generate unwinds for various linker-generated stubs. | |
695 | GDB reads in the stubs from the $UNWIND_END$ subspace, then | |
696 | "converts" them into normal unwind entries using some of the reserved | |
697 | fields to store the stub type. */ | |
698 | ||
699 | struct stub_unwind_entry | |
c5aa993b JM |
700 | { |
701 | /* The offset within the executable for the associated stub. */ | |
702 | unsigned stub_offset; | |
c906108c | 703 | |
c5aa993b JM |
704 | /* The type of stub this unwind entry describes. */ |
705 | char type; | |
c906108c | 706 | |
c5aa993b JM |
707 | /* Unknown. Not needed by GDB at this time. */ |
708 | char prs_info; | |
c906108c | 709 | |
c5aa993b JM |
710 | /* Length (in instructions) of the associated stub. */ |
711 | short stub_length; | |
712 | }; | |
c906108c SS |
713 | |
714 | /* Sizes (in bytes) of the native unwind entries. */ | |
715 | #define UNWIND_ENTRY_SIZE 16 | |
716 | #define STUB_UNWIND_ENTRY_SIZE 8 | |
717 | ||
718 | /* The gaps represent linker stubs used in MPE and space for future | |
719 | expansion. */ | |
720 | enum unwind_stub_types | |
c5aa993b JM |
721 | { |
722 | LONG_BRANCH = 1, | |
723 | PARAMETER_RELOCATION = 2, | |
724 | EXPORT = 10, | |
725 | IMPORT = 11, | |
726 | IMPORT_SHLIB = 12, | |
727 | }; | |
c906108c SS |
728 | |
729 | /* We use the objfile->obj_private pointer for two things: | |
c5aa993b | 730 | |
c906108c SS |
731 | * 1. An unwind table; |
732 | * | |
733 | * 2. A pointer to any associated shared library object. | |
734 | * | |
735 | * #defines are used to help refer to these objects. | |
736 | */ | |
c5aa993b | 737 | |
c906108c | 738 | /* Info about the unwind table associated with an object file. |
c5aa993b | 739 | |
c906108c SS |
740 | * This is hung off of the "objfile->obj_private" pointer, and |
741 | * is allocated in the objfile's psymbol obstack. This allows | |
742 | * us to have unique unwind info for each executable and shared | |
743 | * library that we are debugging. | |
744 | */ | |
c5aa993b JM |
745 | struct obj_unwind_info |
746 | { | |
747 | struct unwind_table_entry *table; /* Pointer to unwind info */ | |
748 | struct unwind_table_entry *cache; /* Pointer to last entry we found */ | |
749 | int last; /* Index of last entry */ | |
750 | }; | |
751 | ||
752 | typedef struct obj_private_struct | |
753 | { | |
754 | struct obj_unwind_info *unwind_info; /* a pointer */ | |
755 | struct so_list *so_info; /* a pointer */ | |
53a5351d | 756 | CORE_ADDR dp; |
c5aa993b JM |
757 | } |
758 | obj_private_data_t; | |
c906108c SS |
759 | |
760 | #if 0 | |
a14ed312 KB |
761 | extern void target_write_pc (CORE_ADDR, int); |
762 | extern CORE_ADDR target_read_pc (int); | |
763 | extern CORE_ADDR skip_trampoline_code (CORE_ADDR, char *); | |
c906108c SS |
764 | #endif |
765 | ||
766 | #define TARGET_READ_PC(pid) target_read_pc (pid) | |
a14ed312 | 767 | extern CORE_ADDR target_read_pc (int); |
c906108c SS |
768 | |
769 | #define TARGET_WRITE_PC(v,pid) target_write_pc (v,pid) | |
a14ed312 | 770 | extern void target_write_pc (CORE_ADDR, int); |
c906108c SS |
771 | |
772 | #define TARGET_READ_FP() target_read_fp (inferior_pid) | |
a14ed312 | 773 | extern CORE_ADDR target_read_fp (int); |
c906108c SS |
774 | |
775 | /* For a number of horrible reasons we may have to adjust the location | |
776 | of variables on the stack. Ugh. */ | |
777 | #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR) | |
778 | ||
a14ed312 | 779 | extern int hpread_adjust_stack_address (CORE_ADDR); |
c906108c SS |
780 | |
781 | /* If the current gcc for for this target does not produce correct debugging | |
782 | information for float parameters, both prototyped and unprototyped, then | |
783 | define this macro. This forces gdb to always assume that floats are | |
784 | passed as doubles and then converted in the callee. | |
785 | ||
786 | For the pa, it appears that the debug info marks the parameters as | |
787 | floats regardless of whether the function is prototyped, but the actual | |
788 | values are passed as doubles for the non-prototyped case and floats for | |
789 | the prototyped case. Thus we choose to make the non-prototyped case work | |
790 | for C and break the prototyped case, since the non-prototyped case is | |
791 | probably much more common. (FIXME). */ | |
792 | ||
b9a8e3bf | 793 | #define COERCE_FLOAT_TO_DOUBLE(formal, actual) (current_language -> la_language == language_c) |
c2c6d25f JM |
794 | |
795 | /* Here's how to step off a permanent breakpoint. */ | |
796 | #define SKIP_PERMANENT_BREAKPOINT (hppa_skip_permanent_breakpoint) | |
797 | extern void hppa_skip_permanent_breakpoint (void); | |
2df3850c JM |
798 | |
799 | /* On HP-UX, certain system routines (millicode) have names beginning | |
800 | with $ or $$, e.g. $$dyncall, which handles inter-space procedure | |
801 | calls on PA-RISC. Tell the expression parser to check for those | |
802 | when parsing tokens that begin with "$". */ | |
803 | #define SYMBOLS_CAN_START_WITH_DOLLAR (1) |