Commit | Line | Data |
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7b112f9c JT |
1 | /* Target-dependent code for PowerPC systems using the SVR4 ABI |
2 | for GDB, the GNU debugger. | |
3 | ||
6aba47ca | 4 | Copyright (C) 2000, 2001, 2002, 2003, 2005, 2007 |
65ada037 | 5 | Free Software Foundation, Inc. |
7b112f9c JT |
6 | |
7 | This file is part of GDB. | |
8 | ||
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. | |
13 | ||
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. | |
18 | ||
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 | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
7b112f9c JT |
23 | |
24 | #include "defs.h" | |
25 | #include "gdbcore.h" | |
26 | #include "inferior.h" | |
27 | #include "regcache.h" | |
28 | #include "value.h" | |
bdf64bac | 29 | #include "gdb_string.h" |
8be9034a | 30 | #include "gdb_assert.h" |
7b112f9c | 31 | #include "ppc-tdep.h" |
6066c3de | 32 | #include "target.h" |
0a90bcdd | 33 | #include "objfiles.h" |
7d9b040b | 34 | #include "infcall.h" |
7b112f9c | 35 | |
7b112f9c JT |
36 | /* Pass the arguments in either registers, or in the stack. Using the |
37 | ppc sysv ABI, the first eight words of the argument list (that might | |
38 | be less than eight parameters if some parameters occupy more than one | |
39 | word) are passed in r3..r10 registers. float and double parameters are | |
40 | passed in fpr's, in addition to that. Rest of the parameters if any | |
41 | are passed in user stack. | |
42 | ||
43 | If the function is returning a structure, then the return address is passed | |
44 | in r3, then the first 7 words of the parametes can be passed in registers, | |
45 | starting from r4. */ | |
46 | ||
47 | CORE_ADDR | |
7d9b040b | 48 | ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
77b2b6d4 AC |
49 | struct regcache *regcache, CORE_ADDR bp_addr, |
50 | int nargs, struct value **args, CORE_ADDR sp, | |
51 | int struct_return, CORE_ADDR struct_addr) | |
7b112f9c | 52 | { |
0a613259 | 53 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
fb4443d8 | 54 | ULONGEST saved_sp; |
68856ea3 AC |
55 | int argspace = 0; /* 0 is an initial wrong guess. */ |
56 | int write_pass; | |
7b112f9c | 57 | |
3e8c568d UW |
58 | regcache_cooked_read_unsigned (regcache, |
59 | gdbarch_sp_regnum (current_gdbarch), | |
60 | &saved_sp); | |
fb4443d8 | 61 | |
68856ea3 | 62 | /* Go through the argument list twice. |
7b112f9c | 63 | |
68856ea3 AC |
64 | Pass 1: Figure out how much new stack space is required for |
65 | arguments and pushed values. Unlike the PowerOpen ABI, the SysV | |
66 | ABI doesn't reserve any extra space for parameters which are put | |
67 | in registers, but does always push structures and then pass their | |
68 | address. | |
7a41266b | 69 | |
68856ea3 AC |
70 | Pass 2: Replay the same computation but this time also write the |
71 | values out to the target. */ | |
7b112f9c | 72 | |
68856ea3 AC |
73 | for (write_pass = 0; write_pass < 2; write_pass++) |
74 | { | |
75 | int argno; | |
76 | /* Next available floating point register for float and double | |
77 | arguments. */ | |
78 | int freg = 1; | |
79 | /* Next available general register for non-float, non-vector | |
80 | arguments. */ | |
81 | int greg = 3; | |
82 | /* Next available vector register for vector arguments. */ | |
83 | int vreg = 2; | |
84 | /* Arguments start above the "LR save word" and "Back chain". */ | |
85 | int argoffset = 2 * tdep->wordsize; | |
86 | /* Structures start after the arguments. */ | |
87 | int structoffset = argoffset + argspace; | |
88 | ||
89 | /* If the function is returning a `struct', then the first word | |
944fcfab AC |
90 | (which will be passed in r3) is used for struct return |
91 | address. In that case we should advance one word and start | |
92 | from r4 register to copy parameters. */ | |
68856ea3 | 93 | if (struct_return) |
7b112f9c | 94 | { |
68856ea3 AC |
95 | if (write_pass) |
96 | regcache_cooked_write_signed (regcache, | |
97 | tdep->ppc_gp0_regnum + greg, | |
98 | struct_addr); | |
99 | greg++; | |
7b112f9c | 100 | } |
68856ea3 AC |
101 | |
102 | for (argno = 0; argno < nargs; argno++) | |
7b112f9c | 103 | { |
68856ea3 | 104 | struct value *arg = args[argno]; |
df407dfe | 105 | struct type *type = check_typedef (value_type (arg)); |
68856ea3 | 106 | int len = TYPE_LENGTH (type); |
0fd88904 | 107 | const bfd_byte *val = value_contents (arg); |
68856ea3 AC |
108 | |
109 | if (TYPE_CODE (type) == TYPE_CODE_FLT | |
944fcfab | 110 | && ppc_floating_point_unit_p (current_gdbarch) && len <= 8) |
7b112f9c | 111 | { |
68856ea3 | 112 | /* Floating point value converted to "double" then |
944fcfab AC |
113 | passed in an FP register, when the registers run out, |
114 | 8 byte aligned stack is used. */ | |
68856ea3 AC |
115 | if (freg <= 8) |
116 | { | |
117 | if (write_pass) | |
118 | { | |
119 | /* Always store the floating point value using | |
944fcfab | 120 | the register's floating-point format. */ |
50fd1280 | 121 | gdb_byte regval[MAX_REGISTER_SIZE]; |
68856ea3 | 122 | struct type *regtype |
366f009f | 123 | = register_type (gdbarch, tdep->ppc_fp0_regnum + freg); |
68856ea3 | 124 | convert_typed_floating (val, type, regval, regtype); |
366f009f JB |
125 | regcache_cooked_write (regcache, |
126 | tdep->ppc_fp0_regnum + freg, | |
68856ea3 AC |
127 | regval); |
128 | } | |
129 | freg++; | |
130 | } | |
7b112f9c JT |
131 | else |
132 | { | |
68856ea3 | 133 | /* SysV ABI converts floats to doubles before |
944fcfab | 134 | writing them to an 8 byte aligned stack location. */ |
68856ea3 AC |
135 | argoffset = align_up (argoffset, 8); |
136 | if (write_pass) | |
137 | { | |
138 | char memval[8]; | |
8da61cc4 DJ |
139 | convert_typed_floating (val, type, memval, |
140 | builtin_type_ieee_double); | |
68856ea3 AC |
141 | write_memory (sp + argoffset, val, len); |
142 | } | |
143 | argoffset += 8; | |
7b112f9c JT |
144 | } |
145 | } | |
944fcfab AC |
146 | else if (len == 8 && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */ |
147 | || (!ppc_floating_point_unit_p (current_gdbarch) && TYPE_CODE (type) == TYPE_CODE_FLT))) /* double */ | |
7b112f9c | 148 | { |
68856ea3 | 149 | /* "long long" or "double" passed in an odd/even |
944fcfab AC |
150 | register pair with the low addressed word in the odd |
151 | register and the high addressed word in the even | |
152 | register, or when the registers run out an 8 byte | |
153 | aligned stack location. */ | |
68856ea3 AC |
154 | if (greg > 9) |
155 | { | |
156 | /* Just in case GREG was 10. */ | |
157 | greg = 11; | |
158 | argoffset = align_up (argoffset, 8); | |
159 | if (write_pass) | |
160 | write_memory (sp + argoffset, val, len); | |
161 | argoffset += 8; | |
162 | } | |
163 | else if (tdep->wordsize == 8) | |
164 | { | |
165 | if (write_pass) | |
166 | regcache_cooked_write (regcache, | |
944fcfab | 167 | tdep->ppc_gp0_regnum + greg, val); |
68856ea3 AC |
168 | greg += 1; |
169 | } | |
170 | else | |
171 | { | |
172 | /* Must start on an odd register - r3/r4 etc. */ | |
173 | if ((greg & 1) == 0) | |
174 | greg++; | |
175 | if (write_pass) | |
176 | { | |
177 | regcache_cooked_write (regcache, | |
178 | tdep->ppc_gp0_regnum + greg + 0, | |
179 | val + 0); | |
180 | regcache_cooked_write (regcache, | |
181 | tdep->ppc_gp0_regnum + greg + 1, | |
182 | val + 4); | |
183 | } | |
184 | greg += 2; | |
185 | } | |
7b112f9c | 186 | } |
68856ea3 AC |
187 | else if (len == 16 |
188 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
944fcfab | 189 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) |
7b112f9c | 190 | { |
68856ea3 | 191 | /* Vector parameter passed in an Altivec register, or |
944fcfab | 192 | when that runs out, 16 byte aligned stack location. */ |
7b112f9c JT |
193 | if (vreg <= 13) |
194 | { | |
68856ea3 | 195 | if (write_pass) |
9c9acae0 | 196 | regcache_cooked_write (regcache, |
944fcfab | 197 | tdep->ppc_vr0_regnum + vreg, val); |
7b112f9c JT |
198 | vreg++; |
199 | } | |
200 | else | |
201 | { | |
68856ea3 AC |
202 | argoffset = align_up (argoffset, 16); |
203 | if (write_pass) | |
204 | write_memory (sp + argoffset, val, 16); | |
7b112f9c JT |
205 | argoffset += 16; |
206 | } | |
207 | } | |
944fcfab | 208 | else if (len == 8 |
0a613259 | 209 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
944fcfab AC |
210 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) |
211 | { | |
68856ea3 | 212 | /* Vector parameter passed in an e500 register, or when |
944fcfab AC |
213 | that runs out, 8 byte aligned stack location. Note |
214 | that since e500 vector and general purpose registers | |
215 | both map onto the same underlying register set, a | |
216 | "greg" and not a "vreg" is consumed here. A cooked | |
217 | write stores the value in the correct locations | |
218 | within the raw register cache. */ | |
219 | if (greg <= 10) | |
220 | { | |
68856ea3 | 221 | if (write_pass) |
9c9acae0 | 222 | regcache_cooked_write (regcache, |
944fcfab AC |
223 | tdep->ppc_ev0_regnum + greg, val); |
224 | greg++; | |
225 | } | |
226 | else | |
227 | { | |
68856ea3 AC |
228 | argoffset = align_up (argoffset, 8); |
229 | if (write_pass) | |
230 | write_memory (sp + argoffset, val, 8); | |
944fcfab AC |
231 | argoffset += 8; |
232 | } | |
233 | } | |
68856ea3 AC |
234 | else |
235 | { | |
236 | /* Reduce the parameter down to something that fits in a | |
944fcfab | 237 | "word". */ |
50fd1280 | 238 | gdb_byte word[MAX_REGISTER_SIZE]; |
68856ea3 AC |
239 | memset (word, 0, MAX_REGISTER_SIZE); |
240 | if (len > tdep->wordsize | |
241 | || TYPE_CODE (type) == TYPE_CODE_STRUCT | |
242 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
243 | { | |
244 | /* Structs and large values are put on an 8 byte | |
944fcfab | 245 | aligned stack ... */ |
68856ea3 AC |
246 | structoffset = align_up (structoffset, 8); |
247 | if (write_pass) | |
248 | write_memory (sp + structoffset, val, len); | |
249 | /* ... and then a "word" pointing to that address is | |
944fcfab | 250 | passed as the parameter. */ |
68856ea3 AC |
251 | store_unsigned_integer (word, tdep->wordsize, |
252 | sp + structoffset); | |
253 | structoffset += len; | |
254 | } | |
255 | else if (TYPE_CODE (type) == TYPE_CODE_INT) | |
256 | /* Sign or zero extend the "int" into a "word". */ | |
257 | store_unsigned_integer (word, tdep->wordsize, | |
258 | unpack_long (type, val)); | |
259 | else | |
260 | /* Always goes in the low address. */ | |
261 | memcpy (word, val, len); | |
262 | /* Store that "word" in a register, or on the stack. | |
944fcfab | 263 | The words have "4" byte alignment. */ |
68856ea3 AC |
264 | if (greg <= 10) |
265 | { | |
266 | if (write_pass) | |
267 | regcache_cooked_write (regcache, | |
944fcfab | 268 | tdep->ppc_gp0_regnum + greg, word); |
68856ea3 AC |
269 | greg++; |
270 | } | |
271 | else | |
272 | { | |
273 | argoffset = align_up (argoffset, tdep->wordsize); | |
274 | if (write_pass) | |
275 | write_memory (sp + argoffset, word, tdep->wordsize); | |
276 | argoffset += tdep->wordsize; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
281 | /* Compute the actual stack space requirements. */ | |
282 | if (!write_pass) | |
283 | { | |
284 | /* Remember the amount of space needed by the arguments. */ | |
285 | argspace = argoffset; | |
286 | /* Allocate space for both the arguments and the structures. */ | |
287 | sp -= (argoffset + structoffset); | |
288 | /* Ensure that the stack is still 16 byte aligned. */ | |
289 | sp = align_down (sp, 16); | |
290 | } | |
65ada037 MK |
291 | |
292 | /* The psABI says that "A caller of a function that takes a | |
293 | variable argument list shall set condition register bit 6 to | |
294 | 1 if it passes one or more arguments in the floating-point | |
295 | registers. It is strongly recommended that the caller set the | |
296 | bit to 0 otherwise..." Doing this for normal functions too | |
297 | shouldn't hurt. */ | |
298 | if (write_pass) | |
299 | { | |
300 | ULONGEST cr; | |
301 | ||
302 | regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr); | |
303 | if (freg > 1) | |
304 | cr |= 0x02000000; | |
305 | else | |
306 | cr &= ~0x02000000; | |
307 | regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr); | |
308 | } | |
7b112f9c JT |
309 | } |
310 | ||
68856ea3 | 311 | /* Update %sp. */ |
3e8c568d UW |
312 | regcache_cooked_write_signed (regcache, |
313 | gdbarch_sp_regnum (current_gdbarch), sp); | |
68856ea3 AC |
314 | |
315 | /* Write the backchain (it occupies WORDSIZED bytes). */ | |
316 | write_memory_signed_integer (sp, tdep->wordsize, saved_sp); | |
317 | ||
e56a0ecc AC |
318 | /* Point the inferior function call's return address at the dummy's |
319 | breakpoint. */ | |
68856ea3 | 320 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
e56a0ecc | 321 | |
7b112f9c JT |
322 | return sp; |
323 | } | |
324 | ||
e754ae69 AC |
325 | /* Handle the return-value conventions specified by the SysV 32-bit |
326 | PowerPC ABI (including all the supplements): | |
327 | ||
328 | no floating-point: floating-point values returned using 32-bit | |
329 | general-purpose registers. | |
330 | ||
331 | Altivec: 128-bit vectors returned using vector registers. | |
332 | ||
333 | e500: 64-bit vectors returned using the full full 64 bit EV | |
334 | register, floating-point values returned using 32-bit | |
335 | general-purpose registers. | |
336 | ||
337 | GCC (broken): Small struct values right (instead of left) aligned | |
338 | when returned in general-purpose registers. */ | |
339 | ||
340 | static enum return_value_convention | |
05580c65 | 341 | do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type, |
963e2bb7 AC |
342 | struct regcache *regcache, void *readbuf, |
343 | const void *writebuf, int broken_gcc) | |
e754ae69 | 344 | { |
05580c65 | 345 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e754ae69 AC |
346 | gdb_assert (tdep->wordsize == 4); |
347 | if (TYPE_CODE (type) == TYPE_CODE_FLT | |
348 | && TYPE_LENGTH (type) <= 8 | |
05580c65 | 349 | && ppc_floating_point_unit_p (gdbarch)) |
e754ae69 | 350 | { |
963e2bb7 | 351 | if (readbuf) |
e754ae69 AC |
352 | { |
353 | /* Floats and doubles stored in "f1". Convert the value to | |
354 | the required type. */ | |
50fd1280 | 355 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f JB |
356 | struct type *regtype = register_type (gdbarch, |
357 | tdep->ppc_fp0_regnum + 1); | |
358 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); | |
963e2bb7 | 359 | convert_typed_floating (regval, regtype, readbuf, type); |
e754ae69 | 360 | } |
963e2bb7 | 361 | if (writebuf) |
e754ae69 AC |
362 | { |
363 | /* Floats and doubles stored in "f1". Convert the value to | |
364 | the register's "double" type. */ | |
50fd1280 | 365 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f | 366 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 367 | convert_typed_floating (writebuf, type, regval, regtype); |
366f009f | 368 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
e754ae69 AC |
369 | } |
370 | return RETURN_VALUE_REGISTER_CONVENTION; | |
371 | } | |
372 | if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) | |
373 | || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8)) | |
374 | { | |
963e2bb7 | 375 | if (readbuf) |
e754ae69 AC |
376 | { |
377 | /* A long long, or a double stored in the 32 bit r3/r4. */ | |
378 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 379 | (bfd_byte *) readbuf + 0); |
e754ae69 | 380 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
963e2bb7 | 381 | (bfd_byte *) readbuf + 4); |
e754ae69 | 382 | } |
963e2bb7 | 383 | if (writebuf) |
e754ae69 AC |
384 | { |
385 | /* A long long, or a double stored in the 32 bit r3/r4. */ | |
386 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 387 | (const bfd_byte *) writebuf + 0); |
e754ae69 | 388 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
963e2bb7 | 389 | (const bfd_byte *) writebuf + 4); |
e754ae69 AC |
390 | } |
391 | return RETURN_VALUE_REGISTER_CONVENTION; | |
392 | } | |
393 | if (TYPE_CODE (type) == TYPE_CODE_INT | |
394 | && TYPE_LENGTH (type) <= tdep->wordsize) | |
395 | { | |
963e2bb7 | 396 | if (readbuf) |
e754ae69 AC |
397 | { |
398 | /* Some sort of integer stored in r3. Since TYPE isn't | |
399 | bigger than the register, sign extension isn't a problem | |
400 | - just do everything unsigned. */ | |
401 | ULONGEST regval; | |
402 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
403 | ®val); | |
963e2bb7 | 404 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval); |
e754ae69 | 405 | } |
963e2bb7 | 406 | if (writebuf) |
e754ae69 AC |
407 | { |
408 | /* Some sort of integer stored in r3. Use unpack_long since | |
409 | that should handle any required sign extension. */ | |
410 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 411 | unpack_long (type, writebuf)); |
e754ae69 AC |
412 | } |
413 | return RETURN_VALUE_REGISTER_CONVENTION; | |
414 | } | |
415 | if (TYPE_LENGTH (type) == 16 | |
416 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
417 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) | |
418 | { | |
963e2bb7 | 419 | if (readbuf) |
e754ae69 AC |
420 | { |
421 | /* Altivec places the return value in "v2". */ | |
963e2bb7 | 422 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
e754ae69 | 423 | } |
963e2bb7 | 424 | if (writebuf) |
e754ae69 AC |
425 | { |
426 | /* Altivec places the return value in "v2". */ | |
963e2bb7 | 427 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); |
e754ae69 AC |
428 | } |
429 | return RETURN_VALUE_REGISTER_CONVENTION; | |
430 | } | |
431 | if (TYPE_LENGTH (type) == 8 | |
432 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
433 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) | |
434 | { | |
435 | /* The e500 ABI places return values for the 64-bit DSP types | |
436 | (__ev64_opaque__) in r3. However, in GDB-speak, ev3 | |
437 | corresponds to the entire r3 value for e500, whereas GDB's r3 | |
438 | only corresponds to the least significant 32-bits. So place | |
439 | the 64-bit DSP type's value in ev3. */ | |
963e2bb7 AC |
440 | if (readbuf) |
441 | regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf); | |
442 | if (writebuf) | |
443 | regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf); | |
e754ae69 AC |
444 | return RETURN_VALUE_REGISTER_CONVENTION; |
445 | } | |
446 | if (broken_gcc && TYPE_LENGTH (type) <= 8) | |
447 | { | |
61bf9ae0 MK |
448 | /* GCC screwed up for structures or unions whose size is less |
449 | than or equal to 8 bytes.. Instead of left-aligning, it | |
450 | right-aligns the data into the buffer formed by r3, r4. */ | |
451 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; | |
452 | int len = TYPE_LENGTH (type); | |
453 | int offset = (2 * tdep->wordsize - len) % tdep->wordsize; | |
454 | ||
963e2bb7 | 455 | if (readbuf) |
e754ae69 | 456 | { |
61bf9ae0 MK |
457 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
458 | regvals + 0 * tdep->wordsize); | |
459 | if (len > tdep->wordsize) | |
460 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, | |
461 | regvals + 1 * tdep->wordsize); | |
462 | memcpy (readbuf, regvals + offset, len); | |
e754ae69 | 463 | } |
963e2bb7 | 464 | if (writebuf) |
e754ae69 | 465 | { |
61bf9ae0 MK |
466 | memset (regvals, 0, sizeof regvals); |
467 | memcpy (regvals + offset, writebuf, len); | |
468 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, | |
469 | regvals + 0 * tdep->wordsize); | |
470 | if (len > tdep->wordsize) | |
471 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, | |
472 | regvals + 1 * tdep->wordsize); | |
e754ae69 | 473 | } |
61bf9ae0 | 474 | |
e754ae69 AC |
475 | return RETURN_VALUE_REGISTER_CONVENTION; |
476 | } | |
477 | if (TYPE_LENGTH (type) <= 8) | |
478 | { | |
963e2bb7 | 479 | if (readbuf) |
e754ae69 AC |
480 | { |
481 | /* This matches SVr4 PPC, it does not match GCC. */ | |
482 | /* The value is right-padded to 8 bytes and then loaded, as | |
483 | two "words", into r3/r4. */ | |
50fd1280 | 484 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
e754ae69 AC |
485 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
486 | regvals + 0 * tdep->wordsize); | |
487 | if (TYPE_LENGTH (type) > tdep->wordsize) | |
488 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, | |
489 | regvals + 1 * tdep->wordsize); | |
963e2bb7 | 490 | memcpy (readbuf, regvals, TYPE_LENGTH (type)); |
e754ae69 | 491 | } |
963e2bb7 | 492 | if (writebuf) |
e754ae69 AC |
493 | { |
494 | /* This matches SVr4 PPC, it does not match GCC. */ | |
495 | /* The value is padded out to 8 bytes and then loaded, as | |
496 | two "words" into r3/r4. */ | |
50fd1280 | 497 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
e754ae69 | 498 | memset (regvals, 0, sizeof regvals); |
963e2bb7 | 499 | memcpy (regvals, writebuf, TYPE_LENGTH (type)); |
e754ae69 AC |
500 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
501 | regvals + 0 * tdep->wordsize); | |
502 | if (TYPE_LENGTH (type) > tdep->wordsize) | |
503 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, | |
504 | regvals + 1 * tdep->wordsize); | |
505 | } | |
506 | return RETURN_VALUE_REGISTER_CONVENTION; | |
507 | } | |
508 | return RETURN_VALUE_STRUCT_CONVENTION; | |
509 | } | |
510 | ||
05580c65 AC |
511 | enum return_value_convention |
512 | ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
50fd1280 AC |
513 | struct regcache *regcache, gdb_byte *readbuf, |
514 | const gdb_byte *writebuf) | |
e754ae69 | 515 | { |
963e2bb7 AC |
516 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
517 | writebuf, 0); | |
e754ae69 AC |
518 | } |
519 | ||
05580c65 | 520 | enum return_value_convention |
963e2bb7 AC |
521 | ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch, |
522 | struct type *valtype, | |
523 | struct regcache *regcache, | |
50fd1280 | 524 | gdb_byte *readbuf, const gdb_byte *writebuf) |
e754ae69 | 525 | { |
963e2bb7 AC |
526 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
527 | writebuf, 1); | |
944fcfab | 528 | } |
afd48b75 | 529 | |
b6e1c027 AC |
530 | /* The helper function for 64-bit SYSV push_dummy_call. Converts the |
531 | function's code address back into the function's descriptor | |
532 | address. | |
533 | ||
534 | Find a value for the TOC register. Every symbol should have both | |
535 | ".FN" and "FN" in the minimal symbol table. "FN" points at the | |
536 | FN's descriptor, while ".FN" points at the entry point (which | |
537 | matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the | |
538 | FN's descriptor address (while at the same time being careful to | |
539 | find "FN" in the same object file as ".FN"). */ | |
540 | ||
541 | static int | |
542 | convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr) | |
543 | { | |
544 | struct obj_section *dot_fn_section; | |
545 | struct minimal_symbol *dot_fn; | |
546 | struct minimal_symbol *fn; | |
547 | CORE_ADDR toc; | |
548 | /* Find the minimal symbol that corresponds to CODE_ADDR (should | |
549 | have a name of the form ".FN"). */ | |
550 | dot_fn = lookup_minimal_symbol_by_pc (code_addr); | |
551 | if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.') | |
552 | return 0; | |
553 | /* Get the section that contains CODE_ADDR. Need this for the | |
554 | "objfile" that it contains. */ | |
555 | dot_fn_section = find_pc_section (code_addr); | |
556 | if (dot_fn_section == NULL || dot_fn_section->objfile == NULL) | |
557 | return 0; | |
558 | /* Now find the corresponding "FN" (dropping ".") minimal symbol's | |
559 | address. Only look for the minimal symbol in ".FN"'s object file | |
560 | - avoids problems when two object files (i.e., shared libraries) | |
561 | contain a minimal symbol with the same name. */ | |
562 | fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL, | |
563 | dot_fn_section->objfile); | |
564 | if (fn == NULL) | |
565 | return 0; | |
566 | /* Found a descriptor. */ | |
567 | (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn); | |
568 | return 1; | |
569 | } | |
570 | ||
8be9034a AC |
571 | /* Pass the arguments in either registers, or in the stack. Using the |
572 | ppc 64 bit SysV ABI. | |
573 | ||
574 | This implements a dumbed down version of the ABI. It always writes | |
575 | values to memory, GPR and FPR, even when not necessary. Doing this | |
576 | greatly simplifies the logic. */ | |
577 | ||
578 | CORE_ADDR | |
7d9b040b | 579 | ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8be9034a AC |
580 | struct regcache *regcache, CORE_ADDR bp_addr, |
581 | int nargs, struct value **args, CORE_ADDR sp, | |
582 | int struct_return, CORE_ADDR struct_addr) | |
583 | { | |
7d9b040b | 584 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
8be9034a | 585 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
fb4443d8 | 586 | ULONGEST back_chain; |
8be9034a AC |
587 | /* See for-loop comment below. */ |
588 | int write_pass; | |
589 | /* Size of the Altivec's vector parameter region, the final value is | |
590 | computed in the for-loop below. */ | |
591 | LONGEST vparam_size = 0; | |
592 | /* Size of the general parameter region, the final value is computed | |
593 | in the for-loop below. */ | |
594 | LONGEST gparam_size = 0; | |
595 | /* Kevin writes ... I don't mind seeing tdep->wordsize used in the | |
596 | calls to align_up(), align_down(), etc. because this makes it | |
597 | easier to reuse this code (in a copy/paste sense) in the future, | |
598 | but it is a 64-bit ABI and asserting that the wordsize is 8 bytes | |
599 | at some point makes it easier to verify that this function is | |
600 | correct without having to do a non-local analysis to figure out | |
601 | the possible values of tdep->wordsize. */ | |
602 | gdb_assert (tdep->wordsize == 8); | |
603 | ||
fb4443d8 UW |
604 | /* By this stage in the proceedings, SP has been decremented by "red |
605 | zone size" + "struct return size". Fetch the stack-pointer from | |
606 | before this and use that as the BACK_CHAIN. */ | |
3e8c568d UW |
607 | regcache_cooked_read_unsigned (regcache, |
608 | gdbarch_sp_regnum (current_gdbarch), | |
609 | &back_chain); | |
fb4443d8 | 610 | |
8be9034a AC |
611 | /* Go through the argument list twice. |
612 | ||
613 | Pass 1: Compute the function call's stack space and register | |
614 | requirements. | |
615 | ||
616 | Pass 2: Replay the same computation but this time also write the | |
617 | values out to the target. */ | |
618 | ||
619 | for (write_pass = 0; write_pass < 2; write_pass++) | |
620 | { | |
621 | int argno; | |
622 | /* Next available floating point register for float and double | |
623 | arguments. */ | |
624 | int freg = 1; | |
625 | /* Next available general register for non-vector (but possibly | |
626 | float) arguments. */ | |
627 | int greg = 3; | |
628 | /* Next available vector register for vector arguments. */ | |
629 | int vreg = 2; | |
630 | /* The address, at which the next general purpose parameter | |
631 | (integer, struct, float, ...) should be saved. */ | |
632 | CORE_ADDR gparam; | |
633 | /* Address, at which the next Altivec vector parameter should be | |
634 | saved. */ | |
635 | CORE_ADDR vparam; | |
636 | ||
637 | if (!write_pass) | |
638 | { | |
639 | /* During the first pass, GPARAM and VPARAM are more like | |
640 | offsets (start address zero) than addresses. That way | |
641 | the accumulate the total stack space each region | |
642 | requires. */ | |
643 | gparam = 0; | |
644 | vparam = 0; | |
645 | } | |
646 | else | |
647 | { | |
648 | /* Decrement the stack pointer making space for the Altivec | |
649 | and general on-stack parameters. Set vparam and gparam | |
650 | to their corresponding regions. */ | |
651 | vparam = align_down (sp - vparam_size, 16); | |
652 | gparam = align_down (vparam - gparam_size, 16); | |
653 | /* Add in space for the TOC, link editor double word, | |
654 | compiler double word, LR save area, CR save area. */ | |
655 | sp = align_down (gparam - 48, 16); | |
656 | } | |
657 | ||
658 | /* If the function is returning a `struct', then there is an | |
659 | extra hidden parameter (which will be passed in r3) | |
660 | containing the address of that struct.. In that case we | |
661 | should advance one word and start from r4 register to copy | |
662 | parameters. This also consumes one on-stack parameter slot. */ | |
663 | if (struct_return) | |
664 | { | |
665 | if (write_pass) | |
666 | regcache_cooked_write_signed (regcache, | |
667 | tdep->ppc_gp0_regnum + greg, | |
668 | struct_addr); | |
669 | greg++; | |
670 | gparam = align_up (gparam + tdep->wordsize, tdep->wordsize); | |
671 | } | |
672 | ||
673 | for (argno = 0; argno < nargs; argno++) | |
674 | { | |
675 | struct value *arg = args[argno]; | |
df407dfe | 676 | struct type *type = check_typedef (value_type (arg)); |
0fd88904 | 677 | const bfd_byte *val = value_contents (arg); |
8be9034a AC |
678 | if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8) |
679 | { | |
680 | /* Floats and Doubles go in f1 .. f13. They also | |
681 | consume a left aligned GREG,, and can end up in | |
682 | memory. */ | |
683 | if (write_pass) | |
684 | { | |
685 | if (ppc_floating_point_unit_p (current_gdbarch) | |
686 | && freg <= 13) | |
687 | { | |
50fd1280 | 688 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f JB |
689 | struct type *regtype |
690 | = register_type (gdbarch, tdep->ppc_fp0_regnum); | |
8be9034a | 691 | convert_typed_floating (val, type, regval, regtype); |
366f009f JB |
692 | regcache_cooked_write (regcache, |
693 | tdep->ppc_fp0_regnum + freg, | |
8be9034a AC |
694 | regval); |
695 | } | |
696 | if (greg <= 10) | |
697 | { | |
698 | /* The ABI states "Single precision floating | |
699 | point values are mapped to the first word in | |
700 | a single doubleword" and "... floating point | |
701 | values mapped to the first eight doublewords | |
702 | of the parameter save area are also passed in | |
703 | general registers"). | |
704 | ||
705 | This code interprets that to mean: store it, | |
706 | left aligned, in the general register. */ | |
50fd1280 | 707 | gdb_byte regval[MAX_REGISTER_SIZE]; |
8be9034a AC |
708 | memset (regval, 0, sizeof regval); |
709 | memcpy (regval, val, TYPE_LENGTH (type)); | |
710 | regcache_cooked_write (regcache, | |
711 | tdep->ppc_gp0_regnum + greg, | |
712 | regval); | |
713 | } | |
714 | write_memory (gparam, val, TYPE_LENGTH (type)); | |
715 | } | |
716 | /* Always consume parameter stack space. */ | |
717 | freg++; | |
718 | greg++; | |
719 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
720 | } | |
721 | else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type) | |
722 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
723 | && tdep->ppc_vr0_regnum >= 0) | |
724 | { | |
725 | /* In the Altivec ABI, vectors go in the vector | |
726 | registers v2 .. v13, or when that runs out, a vector | |
727 | annex which goes above all the normal parameters. | |
728 | NOTE: cagney/2003-09-21: This is a guess based on the | |
729 | PowerOpen Altivec ABI. */ | |
730 | if (vreg <= 13) | |
731 | { | |
732 | if (write_pass) | |
733 | regcache_cooked_write (regcache, | |
734 | tdep->ppc_vr0_regnum + vreg, val); | |
735 | vreg++; | |
736 | } | |
737 | else | |
738 | { | |
739 | if (write_pass) | |
740 | write_memory (vparam, val, TYPE_LENGTH (type)); | |
741 | vparam = align_up (vparam + TYPE_LENGTH (type), 16); | |
742 | } | |
743 | } | |
744 | else if ((TYPE_CODE (type) == TYPE_CODE_INT | |
b6e1c027 AC |
745 | || TYPE_CODE (type) == TYPE_CODE_ENUM |
746 | || TYPE_CODE (type) == TYPE_CODE_PTR) | |
8be9034a AC |
747 | && TYPE_LENGTH (type) <= 8) |
748 | { | |
b6e1c027 AC |
749 | /* Scalars and Pointers get sign[un]extended and go in |
750 | gpr3 .. gpr10. They can also end up in memory. */ | |
8be9034a AC |
751 | if (write_pass) |
752 | { | |
753 | /* Sign extend the value, then store it unsigned. */ | |
754 | ULONGEST word = unpack_long (type, val); | |
b6e1c027 AC |
755 | /* Convert any function code addresses into |
756 | descriptors. */ | |
757 | if (TYPE_CODE (type) == TYPE_CODE_PTR | |
758 | && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC) | |
759 | { | |
760 | CORE_ADDR desc = word; | |
761 | convert_code_addr_to_desc_addr (word, &desc); | |
762 | word = desc; | |
763 | } | |
8be9034a AC |
764 | if (greg <= 10) |
765 | regcache_cooked_write_unsigned (regcache, | |
766 | tdep->ppc_gp0_regnum + | |
767 | greg, word); | |
768 | write_memory_unsigned_integer (gparam, tdep->wordsize, | |
769 | word); | |
770 | } | |
771 | greg++; | |
772 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
773 | } | |
774 | else | |
775 | { | |
776 | int byte; | |
777 | for (byte = 0; byte < TYPE_LENGTH (type); | |
778 | byte += tdep->wordsize) | |
779 | { | |
780 | if (write_pass && greg <= 10) | |
781 | { | |
50fd1280 | 782 | gdb_byte regval[MAX_REGISTER_SIZE]; |
8be9034a AC |
783 | int len = TYPE_LENGTH (type) - byte; |
784 | if (len > tdep->wordsize) | |
785 | len = tdep->wordsize; | |
786 | memset (regval, 0, sizeof regval); | |
787 | /* WARNING: cagney/2003-09-21: As best I can | |
788 | tell, the ABI specifies that the value should | |
789 | be left aligned. Unfortunately, GCC doesn't | |
790 | do this - it instead right aligns even sized | |
791 | values and puts odd sized values on the | |
792 | stack. Work around that by putting both a | |
793 | left and right aligned value into the | |
794 | register (hopefully no one notices :-^). | |
795 | Arrrgh! */ | |
796 | /* Left aligned (8 byte values such as pointers | |
797 | fill the buffer). */ | |
798 | memcpy (regval, val + byte, len); | |
799 | /* Right aligned (but only if even). */ | |
800 | if (len == 1 || len == 2 || len == 4) | |
801 | memcpy (regval + tdep->wordsize - len, | |
802 | val + byte, len); | |
803 | regcache_cooked_write (regcache, greg, regval); | |
804 | } | |
805 | greg++; | |
806 | } | |
807 | if (write_pass) | |
808 | /* WARNING: cagney/2003-09-21: Strictly speaking, this | |
809 | isn't necessary, unfortunately, GCC appears to get | |
810 | "struct convention" parameter passing wrong putting | |
811 | odd sized structures in memory instead of in a | |
812 | register. Work around this by always writing the | |
813 | value to memory. Fortunately, doing this | |
814 | simplifies the code. */ | |
815 | write_memory (gparam, val, TYPE_LENGTH (type)); | |
b6e1c027 AC |
816 | if (write_pass) |
817 | /* WARNING: cagney/2004-06-20: It appears that GCC | |
818 | likes to put structures containing a single | |
819 | floating-point member in an FP register instead of | |
820 | general general purpose. */ | |
8be9034a AC |
821 | /* Always consume parameter stack space. */ |
822 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
823 | } | |
824 | } | |
825 | ||
826 | if (!write_pass) | |
827 | { | |
828 | /* Save the true region sizes ready for the second pass. */ | |
829 | vparam_size = vparam; | |
830 | /* Make certain that the general parameter save area is at | |
831 | least the minimum 8 registers (or doublewords) in size. */ | |
832 | if (greg < 8) | |
833 | gparam_size = 8 * tdep->wordsize; | |
834 | else | |
835 | gparam_size = gparam; | |
836 | } | |
837 | } | |
838 | ||
839 | /* Update %sp. */ | |
3e8c568d UW |
840 | regcache_cooked_write_signed (regcache, |
841 | gdbarch_sp_regnum (current_gdbarch), sp); | |
8be9034a AC |
842 | |
843 | /* Write the backchain (it occupies WORDSIZED bytes). */ | |
844 | write_memory_signed_integer (sp, tdep->wordsize, back_chain); | |
845 | ||
846 | /* Point the inferior function call's return address at the dummy's | |
847 | breakpoint. */ | |
848 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); | |
849 | ||
b6e1c027 AC |
850 | /* Use the func_addr to find the descriptor, and use that to find |
851 | the TOC. */ | |
8be9034a | 852 | { |
b6e1c027 AC |
853 | CORE_ADDR desc_addr; |
854 | if (convert_code_addr_to_desc_addr (func_addr, &desc_addr)) | |
8be9034a | 855 | { |
b6e1c027 AC |
856 | /* The TOC is the second double word in the descriptor. */ |
857 | CORE_ADDR toc = | |
858 | read_memory_unsigned_integer (desc_addr + tdep->wordsize, | |
859 | tdep->wordsize); | |
860 | regcache_cooked_write_unsigned (regcache, | |
861 | tdep->ppc_gp0_regnum + 2, toc); | |
8be9034a AC |
862 | } |
863 | } | |
864 | ||
865 | return sp; | |
866 | } | |
867 | ||
afd48b75 AC |
868 | |
869 | /* The 64 bit ABI retun value convention. | |
870 | ||
871 | Return non-zero if the return-value is stored in a register, return | |
872 | 0 if the return-value is instead stored on the stack (a.k.a., | |
873 | struct return convention). | |
874 | ||
963e2bb7 | 875 | For a return-value stored in a register: when WRITEBUF is non-NULL, |
afd48b75 | 876 | copy the buffer to the corresponding register return-value location |
963e2bb7 | 877 | location; when READBUF is non-NULL, fill the buffer from the |
afd48b75 | 878 | corresponding register return-value location. */ |
05580c65 AC |
879 | enum return_value_convention |
880 | ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
50fd1280 AC |
881 | struct regcache *regcache, gdb_byte *readbuf, |
882 | const gdb_byte *writebuf) | |
afd48b75 | 883 | { |
05580c65 | 884 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
16796152 JB |
885 | |
886 | /* This function exists to support a calling convention that | |
887 | requires floating-point registers. It shouldn't be used on | |
888 | processors that lack them. */ | |
889 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); | |
890 | ||
afd48b75 | 891 | /* Floats and doubles in F1. */ |
944fcfab | 892 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8) |
afd48b75 | 893 | { |
50fd1280 | 894 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f | 895 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 896 | if (writebuf != NULL) |
afd48b75 | 897 | { |
963e2bb7 | 898 | convert_typed_floating (writebuf, valtype, regval, regtype); |
366f009f | 899 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
afd48b75 | 900 | } |
963e2bb7 | 901 | if (readbuf != NULL) |
afd48b75 | 902 | { |
366f009f | 903 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
963e2bb7 | 904 | convert_typed_floating (regval, regtype, readbuf, valtype); |
afd48b75 AC |
905 | } |
906 | return RETURN_VALUE_REGISTER_CONVENTION; | |
907 | } | |
3d8476bc | 908 | /* Integers in r3. */ |
b6e1c027 AC |
909 | if ((TYPE_CODE (valtype) == TYPE_CODE_INT |
910 | || TYPE_CODE (valtype) == TYPE_CODE_ENUM) | |
911 | && TYPE_LENGTH (valtype) <= 8) | |
afd48b75 | 912 | { |
963e2bb7 | 913 | if (writebuf != NULL) |
afd48b75 AC |
914 | { |
915 | /* Be careful to sign extend the value. */ | |
916 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 917 | unpack_long (valtype, writebuf)); |
afd48b75 | 918 | } |
963e2bb7 | 919 | if (readbuf != NULL) |
afd48b75 AC |
920 | { |
921 | /* Extract the integer from r3. Since this is truncating the | |
922 | value, there isn't a sign extension problem. */ | |
923 | ULONGEST regval; | |
924 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
925 | ®val); | |
963e2bb7 | 926 | store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval); |
afd48b75 AC |
927 | } |
928 | return RETURN_VALUE_REGISTER_CONVENTION; | |
929 | } | |
930 | /* All pointers live in r3. */ | |
931 | if (TYPE_CODE (valtype) == TYPE_CODE_PTR) | |
932 | { | |
933 | /* All pointers live in r3. */ | |
963e2bb7 AC |
934 | if (writebuf != NULL) |
935 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf); | |
936 | if (readbuf != NULL) | |
937 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf); | |
afd48b75 AC |
938 | return RETURN_VALUE_REGISTER_CONVENTION; |
939 | } | |
3d8476bc PG |
940 | /* Array type has more than one use. */ |
941 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
afd48b75 AC |
942 | { |
943 | /* Small character arrays are returned, right justified, in r3. */ | |
3d8476bc PG |
944 | if (TYPE_LENGTH (valtype) <= 8 |
945 | && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT | |
946 | && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1) | |
947 | { | |
948 | int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3) | |
949 | - TYPE_LENGTH (valtype)); | |
950 | if (writebuf != NULL) | |
951 | regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3, | |
952 | offset, TYPE_LENGTH (valtype), writebuf); | |
953 | if (readbuf != NULL) | |
954 | regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3, | |
955 | offset, TYPE_LENGTH (valtype), readbuf); | |
956 | return RETURN_VALUE_REGISTER_CONVENTION; | |
957 | } | |
958 | /* A VMX vector is returned in v2. */ | |
959 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY | |
960 | && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0) | |
961 | { | |
962 | if (readbuf) | |
963 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); | |
964 | if (writebuf) | |
965 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); | |
966 | return RETURN_VALUE_REGISTER_CONVENTION; | |
967 | } | |
afd48b75 AC |
968 | } |
969 | /* Big floating point values get stored in adjacent floating | |
3d8476bc | 970 | point registers, starting with F1. */ |
afd48b75 | 971 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT |
944fcfab | 972 | && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32)) |
afd48b75 | 973 | { |
963e2bb7 | 974 | if (writebuf || readbuf != NULL) |
afd48b75 AC |
975 | { |
976 | int i; | |
977 | for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++) | |
978 | { | |
963e2bb7 | 979 | if (writebuf != NULL) |
366f009f | 980 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 AC |
981 | (const bfd_byte *) writebuf + i * 8); |
982 | if (readbuf != NULL) | |
366f009f | 983 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 | 984 | (bfd_byte *) readbuf + i * 8); |
afd48b75 AC |
985 | } |
986 | } | |
987 | return RETURN_VALUE_REGISTER_CONVENTION; | |
988 | } | |
989 | /* Complex values get returned in f1:f2, need to convert. */ | |
990 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX | |
991 | && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16)) | |
992 | { | |
993 | if (regcache != NULL) | |
994 | { | |
995 | int i; | |
996 | for (i = 0; i < 2; i++) | |
997 | { | |
50fd1280 | 998 | gdb_byte regval[MAX_REGISTER_SIZE]; |
944fcfab | 999 | struct type *regtype = |
366f009f | 1000 | register_type (current_gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 1001 | if (writebuf != NULL) |
afd48b75 | 1002 | { |
963e2bb7 | 1003 | convert_typed_floating ((const bfd_byte *) writebuf + |
944fcfab | 1004 | i * (TYPE_LENGTH (valtype) / 2), |
afd48b75 | 1005 | valtype, regval, regtype); |
366f009f JB |
1006 | regcache_cooked_write (regcache, |
1007 | tdep->ppc_fp0_regnum + 1 + i, | |
944fcfab | 1008 | regval); |
afd48b75 | 1009 | } |
963e2bb7 | 1010 | if (readbuf != NULL) |
afd48b75 | 1011 | { |
366f009f JB |
1012 | regcache_cooked_read (regcache, |
1013 | tdep->ppc_fp0_regnum + 1 + i, | |
1014 | regval); | |
afd48b75 | 1015 | convert_typed_floating (regval, regtype, |
963e2bb7 | 1016 | (bfd_byte *) readbuf + |
944fcfab | 1017 | i * (TYPE_LENGTH (valtype) / 2), |
afd48b75 AC |
1018 | valtype); |
1019 | } | |
1020 | } | |
1021 | } | |
1022 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1023 | } | |
1024 | /* Big complex values get stored in f1:f4. */ | |
944fcfab | 1025 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32) |
afd48b75 AC |
1026 | { |
1027 | if (regcache != NULL) | |
1028 | { | |
1029 | int i; | |
1030 | for (i = 0; i < 4; i++) | |
1031 | { | |
963e2bb7 | 1032 | if (writebuf != NULL) |
366f009f | 1033 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 AC |
1034 | (const bfd_byte *) writebuf + i * 8); |
1035 | if (readbuf != NULL) | |
366f009f | 1036 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 | 1037 | (bfd_byte *) readbuf + i * 8); |
afd48b75 AC |
1038 | } |
1039 | } | |
1040 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1041 | } | |
1042 | return RETURN_VALUE_STRUCT_CONVENTION; | |
1043 | } | |
1044 | ||
6066c3de AC |
1045 | CORE_ADDR |
1046 | ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch, | |
1047 | CORE_ADDR bpaddr) | |
1048 | { | |
1049 | /* PPC64 SYSV specifies that the minimal-symbol "FN" should point at | |
1050 | a function-descriptor while the corresponding minimal-symbol | |
1051 | ".FN" should point at the entry point. Consequently, a command | |
1052 | like "break FN" applied to an object file with only minimal | |
1053 | symbols, will insert the breakpoint into the descriptor at "FN" | |
1054 | and not the function at ".FN". Avoid this confusion by adjusting | |
1055 | any attempt to set a descriptor breakpoint into a corresponding | |
1056 | function breakpoint. Note that GDB warns the user when this | |
1057 | adjustment is applied - that's ok as otherwise the user will have | |
1058 | no way of knowing why their breakpoint at "FN" resulted in the | |
1059 | program stopping at ".FN". */ | |
1060 | return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target); | |
1061 | } |