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 | ||
197e01b6 | 4 | Copyright (C) 2000, 2001, 2002, 2003, 2005 |
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); |
68856ea3 AC |
54 | const CORE_ADDR saved_sp = read_sp (); |
55 | int argspace = 0; /* 0 is an initial wrong guess. */ | |
56 | int write_pass; | |
7b112f9c | 57 | |
68856ea3 | 58 | /* Go through the argument list twice. |
7b112f9c | 59 | |
68856ea3 AC |
60 | Pass 1: Figure out how much new stack space is required for |
61 | arguments and pushed values. Unlike the PowerOpen ABI, the SysV | |
62 | ABI doesn't reserve any extra space for parameters which are put | |
63 | in registers, but does always push structures and then pass their | |
64 | address. | |
7a41266b | 65 | |
68856ea3 AC |
66 | Pass 2: Replay the same computation but this time also write the |
67 | values out to the target. */ | |
7b112f9c | 68 | |
68856ea3 AC |
69 | for (write_pass = 0; write_pass < 2; write_pass++) |
70 | { | |
71 | int argno; | |
72 | /* Next available floating point register for float and double | |
73 | arguments. */ | |
74 | int freg = 1; | |
75 | /* Next available general register for non-float, non-vector | |
76 | arguments. */ | |
77 | int greg = 3; | |
78 | /* Next available vector register for vector arguments. */ | |
79 | int vreg = 2; | |
80 | /* Arguments start above the "LR save word" and "Back chain". */ | |
81 | int argoffset = 2 * tdep->wordsize; | |
82 | /* Structures start after the arguments. */ | |
83 | int structoffset = argoffset + argspace; | |
84 | ||
85 | /* If the function is returning a `struct', then the first word | |
944fcfab AC |
86 | (which will be passed in r3) is used for struct return |
87 | address. In that case we should advance one word and start | |
88 | from r4 register to copy parameters. */ | |
68856ea3 | 89 | if (struct_return) |
7b112f9c | 90 | { |
68856ea3 AC |
91 | if (write_pass) |
92 | regcache_cooked_write_signed (regcache, | |
93 | tdep->ppc_gp0_regnum + greg, | |
94 | struct_addr); | |
95 | greg++; | |
7b112f9c | 96 | } |
68856ea3 AC |
97 | |
98 | for (argno = 0; argno < nargs; argno++) | |
7b112f9c | 99 | { |
68856ea3 | 100 | struct value *arg = args[argno]; |
df407dfe | 101 | struct type *type = check_typedef (value_type (arg)); |
68856ea3 | 102 | int len = TYPE_LENGTH (type); |
0fd88904 | 103 | const bfd_byte *val = value_contents (arg); |
68856ea3 AC |
104 | |
105 | if (TYPE_CODE (type) == TYPE_CODE_FLT | |
944fcfab | 106 | && ppc_floating_point_unit_p (current_gdbarch) && len <= 8) |
7b112f9c | 107 | { |
68856ea3 | 108 | /* Floating point value converted to "double" then |
944fcfab AC |
109 | passed in an FP register, when the registers run out, |
110 | 8 byte aligned stack is used. */ | |
68856ea3 AC |
111 | if (freg <= 8) |
112 | { | |
113 | if (write_pass) | |
114 | { | |
115 | /* Always store the floating point value using | |
944fcfab | 116 | the register's floating-point format. */ |
50fd1280 | 117 | gdb_byte regval[MAX_REGISTER_SIZE]; |
68856ea3 | 118 | struct type *regtype |
366f009f | 119 | = register_type (gdbarch, tdep->ppc_fp0_regnum + freg); |
68856ea3 | 120 | convert_typed_floating (val, type, regval, regtype); |
366f009f JB |
121 | regcache_cooked_write (regcache, |
122 | tdep->ppc_fp0_regnum + freg, | |
68856ea3 AC |
123 | regval); |
124 | } | |
125 | freg++; | |
126 | } | |
7b112f9c JT |
127 | else |
128 | { | |
68856ea3 | 129 | /* SysV ABI converts floats to doubles before |
944fcfab | 130 | writing them to an 8 byte aligned stack location. */ |
68856ea3 AC |
131 | argoffset = align_up (argoffset, 8); |
132 | if (write_pass) | |
133 | { | |
134 | char memval[8]; | |
135 | struct type *memtype; | |
136 | switch (TARGET_BYTE_ORDER) | |
137 | { | |
138 | case BFD_ENDIAN_BIG: | |
139 | memtype = builtin_type_ieee_double_big; | |
140 | break; | |
141 | case BFD_ENDIAN_LITTLE: | |
142 | memtype = builtin_type_ieee_double_little; | |
143 | break; | |
144 | default: | |
e2e0b3e5 | 145 | internal_error (__FILE__, __LINE__, _("bad switch")); |
68856ea3 AC |
146 | } |
147 | convert_typed_floating (val, type, memval, memtype); | |
148 | write_memory (sp + argoffset, val, len); | |
149 | } | |
150 | argoffset += 8; | |
7b112f9c JT |
151 | } |
152 | } | |
944fcfab AC |
153 | else if (len == 8 && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */ |
154 | || (!ppc_floating_point_unit_p (current_gdbarch) && TYPE_CODE (type) == TYPE_CODE_FLT))) /* double */ | |
7b112f9c | 155 | { |
68856ea3 | 156 | /* "long long" or "double" passed in an odd/even |
944fcfab AC |
157 | register pair with the low addressed word in the odd |
158 | register and the high addressed word in the even | |
159 | register, or when the registers run out an 8 byte | |
160 | aligned stack location. */ | |
68856ea3 AC |
161 | if (greg > 9) |
162 | { | |
163 | /* Just in case GREG was 10. */ | |
164 | greg = 11; | |
165 | argoffset = align_up (argoffset, 8); | |
166 | if (write_pass) | |
167 | write_memory (sp + argoffset, val, len); | |
168 | argoffset += 8; | |
169 | } | |
170 | else if (tdep->wordsize == 8) | |
171 | { | |
172 | if (write_pass) | |
173 | regcache_cooked_write (regcache, | |
944fcfab | 174 | tdep->ppc_gp0_regnum + greg, val); |
68856ea3 AC |
175 | greg += 1; |
176 | } | |
177 | else | |
178 | { | |
179 | /* Must start on an odd register - r3/r4 etc. */ | |
180 | if ((greg & 1) == 0) | |
181 | greg++; | |
182 | if (write_pass) | |
183 | { | |
184 | regcache_cooked_write (regcache, | |
185 | tdep->ppc_gp0_regnum + greg + 0, | |
186 | val + 0); | |
187 | regcache_cooked_write (regcache, | |
188 | tdep->ppc_gp0_regnum + greg + 1, | |
189 | val + 4); | |
190 | } | |
191 | greg += 2; | |
192 | } | |
7b112f9c | 193 | } |
68856ea3 AC |
194 | else if (len == 16 |
195 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
944fcfab | 196 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) |
7b112f9c | 197 | { |
68856ea3 | 198 | /* Vector parameter passed in an Altivec register, or |
944fcfab | 199 | when that runs out, 16 byte aligned stack location. */ |
7b112f9c JT |
200 | if (vreg <= 13) |
201 | { | |
68856ea3 AC |
202 | if (write_pass) |
203 | regcache_cooked_write (current_regcache, | |
944fcfab | 204 | tdep->ppc_vr0_regnum + vreg, val); |
7b112f9c JT |
205 | vreg++; |
206 | } | |
207 | else | |
208 | { | |
68856ea3 AC |
209 | argoffset = align_up (argoffset, 16); |
210 | if (write_pass) | |
211 | write_memory (sp + argoffset, val, 16); | |
7b112f9c JT |
212 | argoffset += 16; |
213 | } | |
214 | } | |
944fcfab | 215 | else if (len == 8 |
0a613259 | 216 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
944fcfab AC |
217 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) |
218 | { | |
68856ea3 | 219 | /* Vector parameter passed in an e500 register, or when |
944fcfab AC |
220 | that runs out, 8 byte aligned stack location. Note |
221 | that since e500 vector and general purpose registers | |
222 | both map onto the same underlying register set, a | |
223 | "greg" and not a "vreg" is consumed here. A cooked | |
224 | write stores the value in the correct locations | |
225 | within the raw register cache. */ | |
226 | if (greg <= 10) | |
227 | { | |
68856ea3 AC |
228 | if (write_pass) |
229 | regcache_cooked_write (current_regcache, | |
944fcfab AC |
230 | tdep->ppc_ev0_regnum + greg, val); |
231 | greg++; | |
232 | } | |
233 | else | |
234 | { | |
68856ea3 AC |
235 | argoffset = align_up (argoffset, 8); |
236 | if (write_pass) | |
237 | write_memory (sp + argoffset, val, 8); | |
944fcfab AC |
238 | argoffset += 8; |
239 | } | |
240 | } | |
68856ea3 AC |
241 | else |
242 | { | |
243 | /* Reduce the parameter down to something that fits in a | |
944fcfab | 244 | "word". */ |
50fd1280 | 245 | gdb_byte word[MAX_REGISTER_SIZE]; |
68856ea3 AC |
246 | memset (word, 0, MAX_REGISTER_SIZE); |
247 | if (len > tdep->wordsize | |
248 | || TYPE_CODE (type) == TYPE_CODE_STRUCT | |
249 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
250 | { | |
251 | /* Structs and large values are put on an 8 byte | |
944fcfab | 252 | aligned stack ... */ |
68856ea3 AC |
253 | structoffset = align_up (structoffset, 8); |
254 | if (write_pass) | |
255 | write_memory (sp + structoffset, val, len); | |
256 | /* ... and then a "word" pointing to that address is | |
944fcfab | 257 | passed as the parameter. */ |
68856ea3 AC |
258 | store_unsigned_integer (word, tdep->wordsize, |
259 | sp + structoffset); | |
260 | structoffset += len; | |
261 | } | |
262 | else if (TYPE_CODE (type) == TYPE_CODE_INT) | |
263 | /* Sign or zero extend the "int" into a "word". */ | |
264 | store_unsigned_integer (word, tdep->wordsize, | |
265 | unpack_long (type, val)); | |
266 | else | |
267 | /* Always goes in the low address. */ | |
268 | memcpy (word, val, len); | |
269 | /* Store that "word" in a register, or on the stack. | |
944fcfab | 270 | The words have "4" byte alignment. */ |
68856ea3 AC |
271 | if (greg <= 10) |
272 | { | |
273 | if (write_pass) | |
274 | regcache_cooked_write (regcache, | |
944fcfab | 275 | tdep->ppc_gp0_regnum + greg, word); |
68856ea3 AC |
276 | greg++; |
277 | } | |
278 | else | |
279 | { | |
280 | argoffset = align_up (argoffset, tdep->wordsize); | |
281 | if (write_pass) | |
282 | write_memory (sp + argoffset, word, tdep->wordsize); | |
283 | argoffset += tdep->wordsize; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | /* Compute the actual stack space requirements. */ | |
289 | if (!write_pass) | |
290 | { | |
291 | /* Remember the amount of space needed by the arguments. */ | |
292 | argspace = argoffset; | |
293 | /* Allocate space for both the arguments and the structures. */ | |
294 | sp -= (argoffset + structoffset); | |
295 | /* Ensure that the stack is still 16 byte aligned. */ | |
296 | sp = align_down (sp, 16); | |
297 | } | |
65ada037 MK |
298 | |
299 | /* The psABI says that "A caller of a function that takes a | |
300 | variable argument list shall set condition register bit 6 to | |
301 | 1 if it passes one or more arguments in the floating-point | |
302 | registers. It is strongly recommended that the caller set the | |
303 | bit to 0 otherwise..." Doing this for normal functions too | |
304 | shouldn't hurt. */ | |
305 | if (write_pass) | |
306 | { | |
307 | ULONGEST cr; | |
308 | ||
309 | regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr); | |
310 | if (freg > 1) | |
311 | cr |= 0x02000000; | |
312 | else | |
313 | cr &= ~0x02000000; | |
314 | regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr); | |
315 | } | |
7b112f9c JT |
316 | } |
317 | ||
68856ea3 AC |
318 | /* Update %sp. */ |
319 | regcache_cooked_write_signed (regcache, SP_REGNUM, sp); | |
320 | ||
321 | /* Write the backchain (it occupies WORDSIZED bytes). */ | |
322 | write_memory_signed_integer (sp, tdep->wordsize, saved_sp); | |
323 | ||
e56a0ecc AC |
324 | /* Point the inferior function call's return address at the dummy's |
325 | breakpoint. */ | |
68856ea3 | 326 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
e56a0ecc | 327 | |
7b112f9c JT |
328 | return sp; |
329 | } | |
330 | ||
e754ae69 AC |
331 | /* Handle the return-value conventions specified by the SysV 32-bit |
332 | PowerPC ABI (including all the supplements): | |
333 | ||
334 | no floating-point: floating-point values returned using 32-bit | |
335 | general-purpose registers. | |
336 | ||
337 | Altivec: 128-bit vectors returned using vector registers. | |
338 | ||
339 | e500: 64-bit vectors returned using the full full 64 bit EV | |
340 | register, floating-point values returned using 32-bit | |
341 | general-purpose registers. | |
342 | ||
343 | GCC (broken): Small struct values right (instead of left) aligned | |
344 | when returned in general-purpose registers. */ | |
345 | ||
346 | static enum return_value_convention | |
05580c65 | 347 | do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type, |
963e2bb7 AC |
348 | struct regcache *regcache, void *readbuf, |
349 | const void *writebuf, int broken_gcc) | |
e754ae69 | 350 | { |
05580c65 | 351 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e754ae69 AC |
352 | gdb_assert (tdep->wordsize == 4); |
353 | if (TYPE_CODE (type) == TYPE_CODE_FLT | |
354 | && TYPE_LENGTH (type) <= 8 | |
05580c65 | 355 | && ppc_floating_point_unit_p (gdbarch)) |
e754ae69 | 356 | { |
963e2bb7 | 357 | if (readbuf) |
e754ae69 AC |
358 | { |
359 | /* Floats and doubles stored in "f1". Convert the value to | |
360 | the required type. */ | |
50fd1280 | 361 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f JB |
362 | struct type *regtype = register_type (gdbarch, |
363 | tdep->ppc_fp0_regnum + 1); | |
364 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); | |
963e2bb7 | 365 | convert_typed_floating (regval, regtype, readbuf, type); |
e754ae69 | 366 | } |
963e2bb7 | 367 | if (writebuf) |
e754ae69 AC |
368 | { |
369 | /* Floats and doubles stored in "f1". Convert the value to | |
370 | the register's "double" type. */ | |
50fd1280 | 371 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f | 372 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 373 | convert_typed_floating (writebuf, type, regval, regtype); |
366f009f | 374 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
e754ae69 AC |
375 | } |
376 | return RETURN_VALUE_REGISTER_CONVENTION; | |
377 | } | |
378 | if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) | |
379 | || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8)) | |
380 | { | |
963e2bb7 | 381 | if (readbuf) |
e754ae69 AC |
382 | { |
383 | /* A long long, or a double stored in the 32 bit r3/r4. */ | |
384 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 385 | (bfd_byte *) readbuf + 0); |
e754ae69 | 386 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
963e2bb7 | 387 | (bfd_byte *) readbuf + 4); |
e754ae69 | 388 | } |
963e2bb7 | 389 | if (writebuf) |
e754ae69 AC |
390 | { |
391 | /* A long long, or a double stored in the 32 bit r3/r4. */ | |
392 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 393 | (const bfd_byte *) writebuf + 0); |
e754ae69 | 394 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
963e2bb7 | 395 | (const bfd_byte *) writebuf + 4); |
e754ae69 AC |
396 | } |
397 | return RETURN_VALUE_REGISTER_CONVENTION; | |
398 | } | |
399 | if (TYPE_CODE (type) == TYPE_CODE_INT | |
400 | && TYPE_LENGTH (type) <= tdep->wordsize) | |
401 | { | |
963e2bb7 | 402 | if (readbuf) |
e754ae69 AC |
403 | { |
404 | /* Some sort of integer stored in r3. Since TYPE isn't | |
405 | bigger than the register, sign extension isn't a problem | |
406 | - just do everything unsigned. */ | |
407 | ULONGEST regval; | |
408 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
409 | ®val); | |
963e2bb7 | 410 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval); |
e754ae69 | 411 | } |
963e2bb7 | 412 | if (writebuf) |
e754ae69 AC |
413 | { |
414 | /* Some sort of integer stored in r3. Use unpack_long since | |
415 | that should handle any required sign extension. */ | |
416 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 417 | unpack_long (type, writebuf)); |
e754ae69 AC |
418 | } |
419 | return RETURN_VALUE_REGISTER_CONVENTION; | |
420 | } | |
421 | if (TYPE_LENGTH (type) == 16 | |
422 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
423 | && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0) | |
424 | { | |
963e2bb7 | 425 | if (readbuf) |
e754ae69 AC |
426 | { |
427 | /* Altivec places the return value in "v2". */ | |
963e2bb7 | 428 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
e754ae69 | 429 | } |
963e2bb7 | 430 | if (writebuf) |
e754ae69 AC |
431 | { |
432 | /* Altivec places the return value in "v2". */ | |
963e2bb7 | 433 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); |
e754ae69 AC |
434 | } |
435 | return RETURN_VALUE_REGISTER_CONVENTION; | |
436 | } | |
437 | if (TYPE_LENGTH (type) == 8 | |
438 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
439 | && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0) | |
440 | { | |
441 | /* The e500 ABI places return values for the 64-bit DSP types | |
442 | (__ev64_opaque__) in r3. However, in GDB-speak, ev3 | |
443 | corresponds to the entire r3 value for e500, whereas GDB's r3 | |
444 | only corresponds to the least significant 32-bits. So place | |
445 | the 64-bit DSP type's value in ev3. */ | |
963e2bb7 AC |
446 | if (readbuf) |
447 | regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf); | |
448 | if (writebuf) | |
449 | regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf); | |
e754ae69 AC |
450 | return RETURN_VALUE_REGISTER_CONVENTION; |
451 | } | |
452 | if (broken_gcc && TYPE_LENGTH (type) <= 8) | |
453 | { | |
61bf9ae0 MK |
454 | /* GCC screwed up for structures or unions whose size is less |
455 | than or equal to 8 bytes.. Instead of left-aligning, it | |
456 | right-aligns the data into the buffer formed by r3, r4. */ | |
457 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; | |
458 | int len = TYPE_LENGTH (type); | |
459 | int offset = (2 * tdep->wordsize - len) % tdep->wordsize; | |
460 | ||
963e2bb7 | 461 | if (readbuf) |
e754ae69 | 462 | { |
61bf9ae0 MK |
463 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
464 | regvals + 0 * tdep->wordsize); | |
465 | if (len > tdep->wordsize) | |
466 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, | |
467 | regvals + 1 * tdep->wordsize); | |
468 | memcpy (readbuf, regvals + offset, len); | |
e754ae69 | 469 | } |
963e2bb7 | 470 | if (writebuf) |
e754ae69 | 471 | { |
61bf9ae0 MK |
472 | memset (regvals, 0, sizeof regvals); |
473 | memcpy (regvals + offset, writebuf, len); | |
474 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, | |
475 | regvals + 0 * tdep->wordsize); | |
476 | if (len > tdep->wordsize) | |
477 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, | |
478 | regvals + 1 * tdep->wordsize); | |
e754ae69 | 479 | } |
61bf9ae0 | 480 | |
e754ae69 AC |
481 | return RETURN_VALUE_REGISTER_CONVENTION; |
482 | } | |
483 | if (TYPE_LENGTH (type) <= 8) | |
484 | { | |
963e2bb7 | 485 | if (readbuf) |
e754ae69 AC |
486 | { |
487 | /* This matches SVr4 PPC, it does not match GCC. */ | |
488 | /* The value is right-padded to 8 bytes and then loaded, as | |
489 | two "words", into r3/r4. */ | |
50fd1280 | 490 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
e754ae69 AC |
491 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
492 | regvals + 0 * tdep->wordsize); | |
493 | if (TYPE_LENGTH (type) > tdep->wordsize) | |
494 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, | |
495 | regvals + 1 * tdep->wordsize); | |
963e2bb7 | 496 | memcpy (readbuf, regvals, TYPE_LENGTH (type)); |
e754ae69 | 497 | } |
963e2bb7 | 498 | if (writebuf) |
e754ae69 AC |
499 | { |
500 | /* This matches SVr4 PPC, it does not match GCC. */ | |
501 | /* The value is padded out to 8 bytes and then loaded, as | |
502 | two "words" into r3/r4. */ | |
50fd1280 | 503 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
e754ae69 | 504 | memset (regvals, 0, sizeof regvals); |
963e2bb7 | 505 | memcpy (regvals, writebuf, TYPE_LENGTH (type)); |
e754ae69 AC |
506 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
507 | regvals + 0 * tdep->wordsize); | |
508 | if (TYPE_LENGTH (type) > tdep->wordsize) | |
509 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, | |
510 | regvals + 1 * tdep->wordsize); | |
511 | } | |
512 | return RETURN_VALUE_REGISTER_CONVENTION; | |
513 | } | |
514 | return RETURN_VALUE_STRUCT_CONVENTION; | |
515 | } | |
516 | ||
05580c65 AC |
517 | enum return_value_convention |
518 | ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
50fd1280 AC |
519 | struct regcache *regcache, gdb_byte *readbuf, |
520 | const gdb_byte *writebuf) | |
e754ae69 | 521 | { |
963e2bb7 AC |
522 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
523 | writebuf, 0); | |
e754ae69 AC |
524 | } |
525 | ||
05580c65 | 526 | enum return_value_convention |
963e2bb7 AC |
527 | ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch, |
528 | struct type *valtype, | |
529 | struct regcache *regcache, | |
50fd1280 | 530 | gdb_byte *readbuf, const gdb_byte *writebuf) |
e754ae69 | 531 | { |
963e2bb7 AC |
532 | return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf, |
533 | writebuf, 1); | |
944fcfab | 534 | } |
afd48b75 | 535 | |
b6e1c027 AC |
536 | /* The helper function for 64-bit SYSV push_dummy_call. Converts the |
537 | function's code address back into the function's descriptor | |
538 | address. | |
539 | ||
540 | Find a value for the TOC register. Every symbol should have both | |
541 | ".FN" and "FN" in the minimal symbol table. "FN" points at the | |
542 | FN's descriptor, while ".FN" points at the entry point (which | |
543 | matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the | |
544 | FN's descriptor address (while at the same time being careful to | |
545 | find "FN" in the same object file as ".FN"). */ | |
546 | ||
547 | static int | |
548 | convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr) | |
549 | { | |
550 | struct obj_section *dot_fn_section; | |
551 | struct minimal_symbol *dot_fn; | |
552 | struct minimal_symbol *fn; | |
553 | CORE_ADDR toc; | |
554 | /* Find the minimal symbol that corresponds to CODE_ADDR (should | |
555 | have a name of the form ".FN"). */ | |
556 | dot_fn = lookup_minimal_symbol_by_pc (code_addr); | |
557 | if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.') | |
558 | return 0; | |
559 | /* Get the section that contains CODE_ADDR. Need this for the | |
560 | "objfile" that it contains. */ | |
561 | dot_fn_section = find_pc_section (code_addr); | |
562 | if (dot_fn_section == NULL || dot_fn_section->objfile == NULL) | |
563 | return 0; | |
564 | /* Now find the corresponding "FN" (dropping ".") minimal symbol's | |
565 | address. Only look for the minimal symbol in ".FN"'s object file | |
566 | - avoids problems when two object files (i.e., shared libraries) | |
567 | contain a minimal symbol with the same name. */ | |
568 | fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL, | |
569 | dot_fn_section->objfile); | |
570 | if (fn == NULL) | |
571 | return 0; | |
572 | /* Found a descriptor. */ | |
573 | (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn); | |
574 | return 1; | |
575 | } | |
576 | ||
8be9034a AC |
577 | /* Pass the arguments in either registers, or in the stack. Using the |
578 | ppc 64 bit SysV ABI. | |
579 | ||
580 | This implements a dumbed down version of the ABI. It always writes | |
581 | values to memory, GPR and FPR, even when not necessary. Doing this | |
582 | greatly simplifies the logic. */ | |
583 | ||
584 | CORE_ADDR | |
7d9b040b | 585 | ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8be9034a AC |
586 | struct regcache *regcache, CORE_ADDR bp_addr, |
587 | int nargs, struct value **args, CORE_ADDR sp, | |
588 | int struct_return, CORE_ADDR struct_addr) | |
589 | { | |
7d9b040b | 590 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
8be9034a AC |
591 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
592 | /* By this stage in the proceedings, SP has been decremented by "red | |
593 | zone size" + "struct return size". Fetch the stack-pointer from | |
594 | before this and use that as the BACK_CHAIN. */ | |
595 | const CORE_ADDR back_chain = read_sp (); | |
596 | /* See for-loop comment below. */ | |
597 | int write_pass; | |
598 | /* Size of the Altivec's vector parameter region, the final value is | |
599 | computed in the for-loop below. */ | |
600 | LONGEST vparam_size = 0; | |
601 | /* Size of the general parameter region, the final value is computed | |
602 | in the for-loop below. */ | |
603 | LONGEST gparam_size = 0; | |
604 | /* Kevin writes ... I don't mind seeing tdep->wordsize used in the | |
605 | calls to align_up(), align_down(), etc. because this makes it | |
606 | easier to reuse this code (in a copy/paste sense) in the future, | |
607 | but it is a 64-bit ABI and asserting that the wordsize is 8 bytes | |
608 | at some point makes it easier to verify that this function is | |
609 | correct without having to do a non-local analysis to figure out | |
610 | the possible values of tdep->wordsize. */ | |
611 | gdb_assert (tdep->wordsize == 8); | |
612 | ||
613 | /* Go through the argument list twice. | |
614 | ||
615 | Pass 1: Compute the function call's stack space and register | |
616 | requirements. | |
617 | ||
618 | Pass 2: Replay the same computation but this time also write the | |
619 | values out to the target. */ | |
620 | ||
621 | for (write_pass = 0; write_pass < 2; write_pass++) | |
622 | { | |
623 | int argno; | |
624 | /* Next available floating point register for float and double | |
625 | arguments. */ | |
626 | int freg = 1; | |
627 | /* Next available general register for non-vector (but possibly | |
628 | float) arguments. */ | |
629 | int greg = 3; | |
630 | /* Next available vector register for vector arguments. */ | |
631 | int vreg = 2; | |
632 | /* The address, at which the next general purpose parameter | |
633 | (integer, struct, float, ...) should be saved. */ | |
634 | CORE_ADDR gparam; | |
635 | /* Address, at which the next Altivec vector parameter should be | |
636 | saved. */ | |
637 | CORE_ADDR vparam; | |
638 | ||
639 | if (!write_pass) | |
640 | { | |
641 | /* During the first pass, GPARAM and VPARAM are more like | |
642 | offsets (start address zero) than addresses. That way | |
643 | the accumulate the total stack space each region | |
644 | requires. */ | |
645 | gparam = 0; | |
646 | vparam = 0; | |
647 | } | |
648 | else | |
649 | { | |
650 | /* Decrement the stack pointer making space for the Altivec | |
651 | and general on-stack parameters. Set vparam and gparam | |
652 | to their corresponding regions. */ | |
653 | vparam = align_down (sp - vparam_size, 16); | |
654 | gparam = align_down (vparam - gparam_size, 16); | |
655 | /* Add in space for the TOC, link editor double word, | |
656 | compiler double word, LR save area, CR save area. */ | |
657 | sp = align_down (gparam - 48, 16); | |
658 | } | |
659 | ||
660 | /* If the function is returning a `struct', then there is an | |
661 | extra hidden parameter (which will be passed in r3) | |
662 | containing the address of that struct.. In that case we | |
663 | should advance one word and start from r4 register to copy | |
664 | parameters. This also consumes one on-stack parameter slot. */ | |
665 | if (struct_return) | |
666 | { | |
667 | if (write_pass) | |
668 | regcache_cooked_write_signed (regcache, | |
669 | tdep->ppc_gp0_regnum + greg, | |
670 | struct_addr); | |
671 | greg++; | |
672 | gparam = align_up (gparam + tdep->wordsize, tdep->wordsize); | |
673 | } | |
674 | ||
675 | for (argno = 0; argno < nargs; argno++) | |
676 | { | |
677 | struct value *arg = args[argno]; | |
df407dfe | 678 | struct type *type = check_typedef (value_type (arg)); |
0fd88904 | 679 | const bfd_byte *val = value_contents (arg); |
8be9034a AC |
680 | if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8) |
681 | { | |
682 | /* Floats and Doubles go in f1 .. f13. They also | |
683 | consume a left aligned GREG,, and can end up in | |
684 | memory. */ | |
685 | if (write_pass) | |
686 | { | |
687 | if (ppc_floating_point_unit_p (current_gdbarch) | |
688 | && freg <= 13) | |
689 | { | |
50fd1280 | 690 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f JB |
691 | struct type *regtype |
692 | = register_type (gdbarch, tdep->ppc_fp0_regnum); | |
8be9034a | 693 | convert_typed_floating (val, type, regval, regtype); |
366f009f JB |
694 | regcache_cooked_write (regcache, |
695 | tdep->ppc_fp0_regnum + freg, | |
8be9034a AC |
696 | regval); |
697 | } | |
698 | if (greg <= 10) | |
699 | { | |
700 | /* The ABI states "Single precision floating | |
701 | point values are mapped to the first word in | |
702 | a single doubleword" and "... floating point | |
703 | values mapped to the first eight doublewords | |
704 | of the parameter save area are also passed in | |
705 | general registers"). | |
706 | ||
707 | This code interprets that to mean: store it, | |
708 | left aligned, in the general register. */ | |
50fd1280 | 709 | gdb_byte regval[MAX_REGISTER_SIZE]; |
8be9034a AC |
710 | memset (regval, 0, sizeof regval); |
711 | memcpy (regval, val, TYPE_LENGTH (type)); | |
712 | regcache_cooked_write (regcache, | |
713 | tdep->ppc_gp0_regnum + greg, | |
714 | regval); | |
715 | } | |
716 | write_memory (gparam, val, TYPE_LENGTH (type)); | |
717 | } | |
718 | /* Always consume parameter stack space. */ | |
719 | freg++; | |
720 | greg++; | |
721 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
722 | } | |
723 | else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type) | |
724 | && TYPE_CODE (type) == TYPE_CODE_ARRAY | |
725 | && tdep->ppc_vr0_regnum >= 0) | |
726 | { | |
727 | /* In the Altivec ABI, vectors go in the vector | |
728 | registers v2 .. v13, or when that runs out, a vector | |
729 | annex which goes above all the normal parameters. | |
730 | NOTE: cagney/2003-09-21: This is a guess based on the | |
731 | PowerOpen Altivec ABI. */ | |
732 | if (vreg <= 13) | |
733 | { | |
734 | if (write_pass) | |
735 | regcache_cooked_write (regcache, | |
736 | tdep->ppc_vr0_regnum + vreg, val); | |
737 | vreg++; | |
738 | } | |
739 | else | |
740 | { | |
741 | if (write_pass) | |
742 | write_memory (vparam, val, TYPE_LENGTH (type)); | |
743 | vparam = align_up (vparam + TYPE_LENGTH (type), 16); | |
744 | } | |
745 | } | |
746 | else if ((TYPE_CODE (type) == TYPE_CODE_INT | |
b6e1c027 AC |
747 | || TYPE_CODE (type) == TYPE_CODE_ENUM |
748 | || TYPE_CODE (type) == TYPE_CODE_PTR) | |
8be9034a AC |
749 | && TYPE_LENGTH (type) <= 8) |
750 | { | |
b6e1c027 AC |
751 | /* Scalars and Pointers get sign[un]extended and go in |
752 | gpr3 .. gpr10. They can also end up in memory. */ | |
8be9034a AC |
753 | if (write_pass) |
754 | { | |
755 | /* Sign extend the value, then store it unsigned. */ | |
756 | ULONGEST word = unpack_long (type, val); | |
b6e1c027 AC |
757 | /* Convert any function code addresses into |
758 | descriptors. */ | |
759 | if (TYPE_CODE (type) == TYPE_CODE_PTR | |
760 | && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC) | |
761 | { | |
762 | CORE_ADDR desc = word; | |
763 | convert_code_addr_to_desc_addr (word, &desc); | |
764 | word = desc; | |
765 | } | |
8be9034a AC |
766 | if (greg <= 10) |
767 | regcache_cooked_write_unsigned (regcache, | |
768 | tdep->ppc_gp0_regnum + | |
769 | greg, word); | |
770 | write_memory_unsigned_integer (gparam, tdep->wordsize, | |
771 | word); | |
772 | } | |
773 | greg++; | |
774 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
775 | } | |
776 | else | |
777 | { | |
778 | int byte; | |
779 | for (byte = 0; byte < TYPE_LENGTH (type); | |
780 | byte += tdep->wordsize) | |
781 | { | |
782 | if (write_pass && greg <= 10) | |
783 | { | |
50fd1280 | 784 | gdb_byte regval[MAX_REGISTER_SIZE]; |
8be9034a AC |
785 | int len = TYPE_LENGTH (type) - byte; |
786 | if (len > tdep->wordsize) | |
787 | len = tdep->wordsize; | |
788 | memset (regval, 0, sizeof regval); | |
789 | /* WARNING: cagney/2003-09-21: As best I can | |
790 | tell, the ABI specifies that the value should | |
791 | be left aligned. Unfortunately, GCC doesn't | |
792 | do this - it instead right aligns even sized | |
793 | values and puts odd sized values on the | |
794 | stack. Work around that by putting both a | |
795 | left and right aligned value into the | |
796 | register (hopefully no one notices :-^). | |
797 | Arrrgh! */ | |
798 | /* Left aligned (8 byte values such as pointers | |
799 | fill the buffer). */ | |
800 | memcpy (regval, val + byte, len); | |
801 | /* Right aligned (but only if even). */ | |
802 | if (len == 1 || len == 2 || len == 4) | |
803 | memcpy (regval + tdep->wordsize - len, | |
804 | val + byte, len); | |
805 | regcache_cooked_write (regcache, greg, regval); | |
806 | } | |
807 | greg++; | |
808 | } | |
809 | if (write_pass) | |
810 | /* WARNING: cagney/2003-09-21: Strictly speaking, this | |
811 | isn't necessary, unfortunately, GCC appears to get | |
812 | "struct convention" parameter passing wrong putting | |
813 | odd sized structures in memory instead of in a | |
814 | register. Work around this by always writing the | |
815 | value to memory. Fortunately, doing this | |
816 | simplifies the code. */ | |
817 | write_memory (gparam, val, TYPE_LENGTH (type)); | |
b6e1c027 AC |
818 | if (write_pass) |
819 | /* WARNING: cagney/2004-06-20: It appears that GCC | |
820 | likes to put structures containing a single | |
821 | floating-point member in an FP register instead of | |
822 | general general purpose. */ | |
8be9034a AC |
823 | /* Always consume parameter stack space. */ |
824 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); | |
825 | } | |
826 | } | |
827 | ||
828 | if (!write_pass) | |
829 | { | |
830 | /* Save the true region sizes ready for the second pass. */ | |
831 | vparam_size = vparam; | |
832 | /* Make certain that the general parameter save area is at | |
833 | least the minimum 8 registers (or doublewords) in size. */ | |
834 | if (greg < 8) | |
835 | gparam_size = 8 * tdep->wordsize; | |
836 | else | |
837 | gparam_size = gparam; | |
838 | } | |
839 | } | |
840 | ||
841 | /* Update %sp. */ | |
842 | regcache_cooked_write_signed (regcache, SP_REGNUM, sp); | |
843 | ||
844 | /* Write the backchain (it occupies WORDSIZED bytes). */ | |
845 | write_memory_signed_integer (sp, tdep->wordsize, back_chain); | |
846 | ||
847 | /* Point the inferior function call's return address at the dummy's | |
848 | breakpoint. */ | |
849 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); | |
850 | ||
b6e1c027 AC |
851 | /* Use the func_addr to find the descriptor, and use that to find |
852 | the TOC. */ | |
8be9034a | 853 | { |
b6e1c027 AC |
854 | CORE_ADDR desc_addr; |
855 | if (convert_code_addr_to_desc_addr (func_addr, &desc_addr)) | |
8be9034a | 856 | { |
b6e1c027 AC |
857 | /* The TOC is the second double word in the descriptor. */ |
858 | CORE_ADDR toc = | |
859 | read_memory_unsigned_integer (desc_addr + tdep->wordsize, | |
860 | tdep->wordsize); | |
861 | regcache_cooked_write_unsigned (regcache, | |
862 | tdep->ppc_gp0_regnum + 2, toc); | |
8be9034a AC |
863 | } |
864 | } | |
865 | ||
866 | return sp; | |
867 | } | |
868 | ||
afd48b75 AC |
869 | |
870 | /* The 64 bit ABI retun value convention. | |
871 | ||
872 | Return non-zero if the return-value is stored in a register, return | |
873 | 0 if the return-value is instead stored on the stack (a.k.a., | |
874 | struct return convention). | |
875 | ||
963e2bb7 | 876 | For a return-value stored in a register: when WRITEBUF is non-NULL, |
afd48b75 | 877 | copy the buffer to the corresponding register return-value location |
963e2bb7 | 878 | location; when READBUF is non-NULL, fill the buffer from the |
afd48b75 | 879 | corresponding register return-value location. */ |
05580c65 AC |
880 | enum return_value_convention |
881 | ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
50fd1280 AC |
882 | struct regcache *regcache, gdb_byte *readbuf, |
883 | const gdb_byte *writebuf) | |
afd48b75 | 884 | { |
05580c65 | 885 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
16796152 JB |
886 | |
887 | /* This function exists to support a calling convention that | |
888 | requires floating-point registers. It shouldn't be used on | |
889 | processors that lack them. */ | |
890 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); | |
891 | ||
afd48b75 | 892 | /* Floats and doubles in F1. */ |
944fcfab | 893 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8) |
afd48b75 | 894 | { |
50fd1280 | 895 | gdb_byte regval[MAX_REGISTER_SIZE]; |
366f009f | 896 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 897 | if (writebuf != NULL) |
afd48b75 | 898 | { |
963e2bb7 | 899 | convert_typed_floating (writebuf, valtype, regval, regtype); |
366f009f | 900 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
afd48b75 | 901 | } |
963e2bb7 | 902 | if (readbuf != NULL) |
afd48b75 | 903 | { |
366f009f | 904 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
963e2bb7 | 905 | convert_typed_floating (regval, regtype, readbuf, valtype); |
afd48b75 AC |
906 | } |
907 | return RETURN_VALUE_REGISTER_CONVENTION; | |
908 | } | |
3d8476bc | 909 | /* Integers in r3. */ |
b6e1c027 AC |
910 | if ((TYPE_CODE (valtype) == TYPE_CODE_INT |
911 | || TYPE_CODE (valtype) == TYPE_CODE_ENUM) | |
912 | && TYPE_LENGTH (valtype) <= 8) | |
afd48b75 | 913 | { |
963e2bb7 | 914 | if (writebuf != NULL) |
afd48b75 AC |
915 | { |
916 | /* Be careful to sign extend the value. */ | |
917 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
963e2bb7 | 918 | unpack_long (valtype, writebuf)); |
afd48b75 | 919 | } |
963e2bb7 | 920 | if (readbuf != NULL) |
afd48b75 AC |
921 | { |
922 | /* Extract the integer from r3. Since this is truncating the | |
923 | value, there isn't a sign extension problem. */ | |
924 | ULONGEST regval; | |
925 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
926 | ®val); | |
963e2bb7 | 927 | store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval); |
afd48b75 AC |
928 | } |
929 | return RETURN_VALUE_REGISTER_CONVENTION; | |
930 | } | |
931 | /* All pointers live in r3. */ | |
932 | if (TYPE_CODE (valtype) == TYPE_CODE_PTR) | |
933 | { | |
934 | /* All pointers live in r3. */ | |
963e2bb7 AC |
935 | if (writebuf != NULL) |
936 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf); | |
937 | if (readbuf != NULL) | |
938 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf); | |
afd48b75 AC |
939 | return RETURN_VALUE_REGISTER_CONVENTION; |
940 | } | |
3d8476bc PG |
941 | /* Array type has more than one use. */ |
942 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
afd48b75 AC |
943 | { |
944 | /* Small character arrays are returned, right justified, in r3. */ | |
3d8476bc PG |
945 | if (TYPE_LENGTH (valtype) <= 8 |
946 | && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT | |
947 | && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1) | |
948 | { | |
949 | int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3) | |
950 | - TYPE_LENGTH (valtype)); | |
951 | if (writebuf != NULL) | |
952 | regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3, | |
953 | offset, TYPE_LENGTH (valtype), writebuf); | |
954 | if (readbuf != NULL) | |
955 | regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3, | |
956 | offset, TYPE_LENGTH (valtype), readbuf); | |
957 | return RETURN_VALUE_REGISTER_CONVENTION; | |
958 | } | |
959 | /* A VMX vector is returned in v2. */ | |
960 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY | |
961 | && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0) | |
962 | { | |
963 | if (readbuf) | |
964 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); | |
965 | if (writebuf) | |
966 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); | |
967 | return RETURN_VALUE_REGISTER_CONVENTION; | |
968 | } | |
afd48b75 AC |
969 | } |
970 | /* Big floating point values get stored in adjacent floating | |
3d8476bc | 971 | point registers, starting with F1. */ |
afd48b75 | 972 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT |
944fcfab | 973 | && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32)) |
afd48b75 | 974 | { |
963e2bb7 | 975 | if (writebuf || readbuf != NULL) |
afd48b75 AC |
976 | { |
977 | int i; | |
978 | for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++) | |
979 | { | |
963e2bb7 | 980 | if (writebuf != NULL) |
366f009f | 981 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 AC |
982 | (const bfd_byte *) writebuf + i * 8); |
983 | if (readbuf != NULL) | |
366f009f | 984 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 | 985 | (bfd_byte *) readbuf + i * 8); |
afd48b75 AC |
986 | } |
987 | } | |
988 | return RETURN_VALUE_REGISTER_CONVENTION; | |
989 | } | |
990 | /* Complex values get returned in f1:f2, need to convert. */ | |
991 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX | |
992 | && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16)) | |
993 | { | |
994 | if (regcache != NULL) | |
995 | { | |
996 | int i; | |
997 | for (i = 0; i < 2; i++) | |
998 | { | |
50fd1280 | 999 | gdb_byte regval[MAX_REGISTER_SIZE]; |
944fcfab | 1000 | struct type *regtype = |
366f009f | 1001 | register_type (current_gdbarch, tdep->ppc_fp0_regnum); |
963e2bb7 | 1002 | if (writebuf != NULL) |
afd48b75 | 1003 | { |
963e2bb7 | 1004 | convert_typed_floating ((const bfd_byte *) writebuf + |
944fcfab | 1005 | i * (TYPE_LENGTH (valtype) / 2), |
afd48b75 | 1006 | valtype, regval, regtype); |
366f009f JB |
1007 | regcache_cooked_write (regcache, |
1008 | tdep->ppc_fp0_regnum + 1 + i, | |
944fcfab | 1009 | regval); |
afd48b75 | 1010 | } |
963e2bb7 | 1011 | if (readbuf != NULL) |
afd48b75 | 1012 | { |
366f009f JB |
1013 | regcache_cooked_read (regcache, |
1014 | tdep->ppc_fp0_regnum + 1 + i, | |
1015 | regval); | |
afd48b75 | 1016 | convert_typed_floating (regval, regtype, |
963e2bb7 | 1017 | (bfd_byte *) readbuf + |
944fcfab | 1018 | i * (TYPE_LENGTH (valtype) / 2), |
afd48b75 AC |
1019 | valtype); |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1024 | } | |
1025 | /* Big complex values get stored in f1:f4. */ | |
944fcfab | 1026 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32) |
afd48b75 AC |
1027 | { |
1028 | if (regcache != NULL) | |
1029 | { | |
1030 | int i; | |
1031 | for (i = 0; i < 4; i++) | |
1032 | { | |
963e2bb7 | 1033 | if (writebuf != NULL) |
366f009f | 1034 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 AC |
1035 | (const bfd_byte *) writebuf + i * 8); |
1036 | if (readbuf != NULL) | |
366f009f | 1037 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
963e2bb7 | 1038 | (bfd_byte *) readbuf + i * 8); |
afd48b75 AC |
1039 | } |
1040 | } | |
1041 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1042 | } | |
1043 | return RETURN_VALUE_STRUCT_CONVENTION; | |
1044 | } | |
1045 | ||
6066c3de AC |
1046 | CORE_ADDR |
1047 | ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch, | |
1048 | CORE_ADDR bpaddr) | |
1049 | { | |
1050 | /* PPC64 SYSV specifies that the minimal-symbol "FN" should point at | |
1051 | a function-descriptor while the corresponding minimal-symbol | |
1052 | ".FN" should point at the entry point. Consequently, a command | |
1053 | like "break FN" applied to an object file with only minimal | |
1054 | symbols, will insert the breakpoint into the descriptor at "FN" | |
1055 | and not the function at ".FN". Avoid this confusion by adjusting | |
1056 | any attempt to set a descriptor breakpoint into a corresponding | |
1057 | function breakpoint. Note that GDB warns the user when this | |
1058 | adjustment is applied - that's ok as otherwise the user will have | |
1059 | no way of knowing why their breakpoint at "FN" resulted in the | |
1060 | program stopping at ".FN". */ | |
1061 | return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target); | |
1062 | } |