1 /* Target-dependent code for PowerPC systems using the SVR4 ABI
2 for GDB, the GNU debugger.
4 Copyright (C) 2000, 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
7 This file is part of GDB.
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 3 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 #include "gdb_string.h"
28 #include "gdb_assert.h"
34 /* Pass the arguments in either registers, or in the stack. Using the
35 ppc sysv ABI, the first eight words of the argument list (that might
36 be less than eight parameters if some parameters occupy more than one
37 word) are passed in r3..r10 registers. float and double parameters are
38 passed in fpr's, in addition to that. Rest of the parameters if any
39 are passed in user stack.
41 If the function is returning a structure, then the return address is passed
42 in r3, then the first 7 words of the parametes can be passed in registers,
46 ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
47 struct regcache *regcache, CORE_ADDR bp_addr,
48 int nargs, struct value **args, CORE_ADDR sp,
49 int struct_return, CORE_ADDR struct_addr)
51 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
52 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
54 int argspace = 0; /* 0 is an initial wrong guess. */
57 gdb_assert (tdep->wordsize == 4);
59 regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
62 /* Go through the argument list twice.
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
70 Pass 2: Replay the same computation but this time also write the
71 values out to the target. */
73 for (write_pass = 0; write_pass < 2; write_pass++)
76 /* Next available floating point register for float and double
79 /* Next available general register for non-float, non-vector
82 /* Next available vector register for vector arguments. */
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;
89 /* If the function is returning a `struct', then the first word
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. */
96 regcache_cooked_write_signed (regcache,
97 tdep->ppc_gp0_regnum + greg,
102 for (argno = 0; argno < nargs; argno++)
104 struct value *arg = args[argno];
105 struct type *type = check_typedef (value_type (arg));
106 int len = TYPE_LENGTH (type);
107 const bfd_byte *val = value_contents (arg);
109 if (TYPE_CODE (type) == TYPE_CODE_FLT && len <= 8
110 && !tdep->soft_float)
112 /* Floating point value converted to "double" then
113 passed in an FP register, when the registers run out,
114 8 byte aligned stack is used. */
119 /* Always store the floating point value using
120 the register's floating-point format. */
121 gdb_byte regval[MAX_REGISTER_SIZE];
123 = register_type (gdbarch, tdep->ppc_fp0_regnum + freg);
124 convert_typed_floating (val, type, regval, regtype);
125 regcache_cooked_write (regcache,
126 tdep->ppc_fp0_regnum + freg,
133 /* The SysV ABI tells us to convert floats to
134 doubles before writing them to an 8 byte aligned
135 stack location. Unfortunately GCC does not do
136 that, and stores floats into 4 byte aligned
137 locations without converting them to doubles.
138 Since there is no know compiler that actually
139 follows the ABI here, we implement the GCC
142 /* Align to 4 bytes or 8 bytes depending on the type of
143 the argument (float or double). */
144 argoffset = align_up (argoffset, len);
146 write_memory (sp + argoffset, val, len);
150 else if (TYPE_CODE (type) == TYPE_CODE_FLT
153 && (gdbarch_long_double_format (gdbarch)
154 == floatformats_ibm_long_double))
156 /* IBM long double passed in two FP registers if
157 available, otherwise 8-byte aligned stack. */
162 regcache_cooked_write (regcache,
163 tdep->ppc_fp0_regnum + freg,
165 regcache_cooked_write (regcache,
166 tdep->ppc_fp0_regnum + freg + 1,
173 argoffset = align_up (argoffset, 8);
175 write_memory (sp + argoffset, val, len);
180 && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */
181 || TYPE_CODE (type) == TYPE_CODE_FLT /* double */
182 || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT
183 && tdep->soft_float)))
185 /* "long long" or soft-float "double" or "_Decimal64"
186 passed in an odd/even register pair with the low
187 addressed word in the odd register and the high
188 addressed word in the even register, or when the
189 registers run out an 8 byte aligned stack
193 /* Just in case GREG was 10. */
195 argoffset = align_up (argoffset, 8);
197 write_memory (sp + argoffset, val, len);
202 /* Must start on an odd register - r3/r4 etc. */
207 regcache_cooked_write (regcache,
208 tdep->ppc_gp0_regnum + greg + 0,
210 regcache_cooked_write (regcache,
211 tdep->ppc_gp0_regnum + greg + 1,
218 && ((TYPE_CODE (type) == TYPE_CODE_FLT
219 && (gdbarch_long_double_format (gdbarch)
220 == floatformats_ibm_long_double))
221 || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT
222 && tdep->soft_float)))
224 /* Soft-float IBM long double or _Decimal128 passed in
225 four consecutive registers, or on the stack. The
226 registers are not necessarily odd/even pairs. */
230 argoffset = align_up (argoffset, 8);
232 write_memory (sp + argoffset, val, len);
239 regcache_cooked_write (regcache,
240 tdep->ppc_gp0_regnum + greg + 0,
242 regcache_cooked_write (regcache,
243 tdep->ppc_gp0_regnum + greg + 1,
245 regcache_cooked_write (regcache,
246 tdep->ppc_gp0_regnum + greg + 2,
248 regcache_cooked_write (regcache,
249 tdep->ppc_gp0_regnum + greg + 3,
255 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len <= 8
256 && !tdep->soft_float)
258 /* 32-bit and 64-bit decimal floats go in f1 .. f8. They can
265 gdb_byte regval[MAX_REGISTER_SIZE];
268 /* 32-bit decimal floats are right aligned in the
270 if (TYPE_LENGTH (type) == 4)
272 memcpy (regval + 4, val, 4);
278 regcache_cooked_write (regcache,
279 tdep->ppc_fp0_regnum + freg, p);
286 argoffset = align_up (argoffset, len);
289 /* Write value in the stack's parameter save area. */
290 write_memory (sp + argoffset, val, len);
295 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len == 16
296 && !tdep->soft_float)
298 /* 128-bit decimal floats go in f2 .. f7, always in even/odd
299 pairs. They can end up in memory, using two doublewords. */
303 /* Make sure freg is even. */
308 regcache_cooked_write (regcache,
309 tdep->ppc_fp0_regnum + freg, val);
310 regcache_cooked_write (regcache,
311 tdep->ppc_fp0_regnum + freg + 1, val + 8);
316 argoffset = align_up (argoffset, 8);
319 write_memory (sp + argoffset, val, 16);
324 /* If a 128-bit decimal float goes to the stack because only f7
325 and f8 are free (thus there's no even/odd register pair
326 available), these registers should be marked as occupied.
327 Hence we increase freg even when writing to memory. */
331 && TYPE_CODE (type) == TYPE_CODE_ARRAY
332 && TYPE_VECTOR (type)
333 && tdep->vector_abi == POWERPC_VEC_ALTIVEC)
335 /* Vector parameter passed in an Altivec register, or
336 when that runs out, 16 byte aligned stack location. */
340 regcache_cooked_write (regcache,
341 tdep->ppc_vr0_regnum + vreg, val);
346 argoffset = align_up (argoffset, 16);
348 write_memory (sp + argoffset, val, 16);
353 && TYPE_CODE (type) == TYPE_CODE_ARRAY
354 && TYPE_VECTOR (type)
355 && tdep->vector_abi == POWERPC_VEC_SPE)
357 /* Vector parameter passed in an e500 register, or when
358 that runs out, 8 byte aligned stack location. Note
359 that since e500 vector and general purpose registers
360 both map onto the same underlying register set, a
361 "greg" and not a "vreg" is consumed here. A cooked
362 write stores the value in the correct locations
363 within the raw register cache. */
367 regcache_cooked_write (regcache,
368 tdep->ppc_ev0_regnum + greg, val);
373 argoffset = align_up (argoffset, 8);
375 write_memory (sp + argoffset, val, 8);
381 /* Reduce the parameter down to something that fits in a
383 gdb_byte word[MAX_REGISTER_SIZE];
384 memset (word, 0, MAX_REGISTER_SIZE);
385 if (len > tdep->wordsize
386 || TYPE_CODE (type) == TYPE_CODE_STRUCT
387 || TYPE_CODE (type) == TYPE_CODE_UNION)
389 /* Structs and large values are put in an
390 aligned stack slot ... */
391 if (TYPE_CODE (type) == TYPE_CODE_ARRAY
392 && TYPE_VECTOR (type)
394 structoffset = align_up (structoffset, 16);
396 structoffset = align_up (structoffset, 8);
399 write_memory (sp + structoffset, val, len);
400 /* ... and then a "word" pointing to that address is
401 passed as the parameter. */
402 store_unsigned_integer (word, tdep->wordsize, byte_order,
406 else if (TYPE_CODE (type) == TYPE_CODE_INT)
407 /* Sign or zero extend the "int" into a "word". */
408 store_unsigned_integer (word, tdep->wordsize, byte_order,
409 unpack_long (type, val));
411 /* Always goes in the low address. */
412 memcpy (word, val, len);
413 /* Store that "word" in a register, or on the stack.
414 The words have "4" byte alignment. */
418 regcache_cooked_write (regcache,
419 tdep->ppc_gp0_regnum + greg, word);
424 argoffset = align_up (argoffset, tdep->wordsize);
426 write_memory (sp + argoffset, word, tdep->wordsize);
427 argoffset += tdep->wordsize;
432 /* Compute the actual stack space requirements. */
435 /* Remember the amount of space needed by the arguments. */
436 argspace = argoffset;
437 /* Allocate space for both the arguments and the structures. */
438 sp -= (argoffset + structoffset);
439 /* Ensure that the stack is still 16 byte aligned. */
440 sp = align_down (sp, 16);
443 /* The psABI says that "A caller of a function that takes a
444 variable argument list shall set condition register bit 6 to
445 1 if it passes one or more arguments in the floating-point
446 registers. It is strongly recommended that the caller set the
447 bit to 0 otherwise..." Doing this for normal functions too
453 regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr);
458 regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr);
463 regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
465 /* Write the backchain (it occupies WORDSIZED bytes). */
466 write_memory_signed_integer (sp, tdep->wordsize, byte_order, saved_sp);
468 /* Point the inferior function call's return address at the dummy's
470 regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
475 /* Handle the return-value conventions for Decimal Floating Point values
476 in both ppc32 and ppc64, which are the same. */
478 get_decimal_float_return_value (struct gdbarch *gdbarch, struct type *valtype,
479 struct regcache *regcache, gdb_byte *readbuf,
480 const gdb_byte *writebuf)
482 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
484 gdb_assert (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT);
486 /* 32-bit and 64-bit decimal floats in f1. */
487 if (TYPE_LENGTH (valtype) <= 8)
489 if (writebuf != NULL)
491 gdb_byte regval[MAX_REGISTER_SIZE];
494 /* 32-bit decimal float is right aligned in the doubleword. */
495 if (TYPE_LENGTH (valtype) == 4)
497 memcpy (regval + 4, writebuf, 4);
503 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, p);
507 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
509 /* Left align 32-bit decimal float. */
510 if (TYPE_LENGTH (valtype) == 4)
511 memcpy (readbuf, readbuf + 4, 4);
514 /* 128-bit decimal floats in f2,f3. */
515 else if (TYPE_LENGTH (valtype) == 16)
517 if (writebuf != NULL || readbuf != NULL)
521 for (i = 0; i < 2; i++)
523 if (writebuf != NULL)
524 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2 + i,
527 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2 + i,
534 internal_error (__FILE__, __LINE__, _("Unknown decimal float size."));
536 return RETURN_VALUE_REGISTER_CONVENTION;
539 /* Handle the return-value conventions specified by the SysV 32-bit
540 PowerPC ABI (including all the supplements):
542 no floating-point: floating-point values returned using 32-bit
543 general-purpose registers.
545 Altivec: 128-bit vectors returned using vector registers.
547 e500: 64-bit vectors returned using the full full 64 bit EV
548 register, floating-point values returned using 32-bit
549 general-purpose registers.
551 GCC (broken): Small struct values right (instead of left) aligned
552 when returned in general-purpose registers. */
554 static enum return_value_convention
555 do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type,
556 struct regcache *regcache, gdb_byte *readbuf,
557 const gdb_byte *writebuf, int broken_gcc)
559 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
560 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
561 gdb_assert (tdep->wordsize == 4);
562 if (TYPE_CODE (type) == TYPE_CODE_FLT
563 && TYPE_LENGTH (type) <= 8
564 && !tdep->soft_float)
568 /* Floats and doubles stored in "f1". Convert the value to
569 the required type. */
570 gdb_byte regval[MAX_REGISTER_SIZE];
571 struct type *regtype = register_type (gdbarch,
572 tdep->ppc_fp0_regnum + 1);
573 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
574 convert_typed_floating (regval, regtype, readbuf, type);
578 /* Floats and doubles stored in "f1". Convert the value to
579 the register's "double" type. */
580 gdb_byte regval[MAX_REGISTER_SIZE];
581 struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
582 convert_typed_floating (writebuf, type, regval, regtype);
583 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
585 return RETURN_VALUE_REGISTER_CONVENTION;
587 if (TYPE_CODE (type) == TYPE_CODE_FLT
588 && TYPE_LENGTH (type) == 16
590 && (gdbarch_long_double_format (gdbarch)
591 == floatformats_ibm_long_double))
593 /* IBM long double stored in f1 and f2. */
596 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
597 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2,
602 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, writebuf);
603 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2,
606 return RETURN_VALUE_REGISTER_CONVENTION;
608 if (TYPE_LENGTH (type) == 16
609 && ((TYPE_CODE (type) == TYPE_CODE_FLT
610 && (gdbarch_long_double_format (gdbarch)
611 == floatformats_ibm_long_double))
612 || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && tdep->soft_float)))
614 /* Soft-float IBM long double or _Decimal128 stored in r3, r4,
618 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
619 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
621 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
623 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
628 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
629 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
631 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
633 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
636 return RETURN_VALUE_REGISTER_CONVENTION;
638 if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
639 || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8)
640 || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && TYPE_LENGTH (type) == 8
641 && tdep->soft_float))
645 /* A long long, double or _Decimal64 stored in the 32 bit
647 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
649 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
654 /* A long long, double or _Decimal64 stored in the 32 bit
656 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
658 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
661 return RETURN_VALUE_REGISTER_CONVENTION;
663 if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && !tdep->soft_float)
664 return get_decimal_float_return_value (gdbarch, type, regcache, readbuf,
666 else if ((TYPE_CODE (type) == TYPE_CODE_INT
667 || TYPE_CODE (type) == TYPE_CODE_CHAR
668 || TYPE_CODE (type) == TYPE_CODE_BOOL
669 || TYPE_CODE (type) == TYPE_CODE_PTR
670 || TYPE_CODE (type) == TYPE_CODE_REF
671 || TYPE_CODE (type) == TYPE_CODE_ENUM)
672 && TYPE_LENGTH (type) <= tdep->wordsize)
676 /* Some sort of integer stored in r3. Since TYPE isn't
677 bigger than the register, sign extension isn't a problem
678 - just do everything unsigned. */
680 regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
682 store_unsigned_integer (readbuf, TYPE_LENGTH (type), byte_order,
687 /* Some sort of integer stored in r3. Use unpack_long since
688 that should handle any required sign extension. */
689 regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
690 unpack_long (type, writebuf));
692 return RETURN_VALUE_REGISTER_CONVENTION;
694 if (TYPE_LENGTH (type) == 16
695 && TYPE_CODE (type) == TYPE_CODE_ARRAY
696 && TYPE_VECTOR (type)
697 && tdep->vector_abi == POWERPC_VEC_ALTIVEC)
701 /* Altivec places the return value in "v2". */
702 regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
706 /* Altivec places the return value in "v2". */
707 regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
709 return RETURN_VALUE_REGISTER_CONVENTION;
711 if (TYPE_LENGTH (type) == 16
712 && TYPE_CODE (type) == TYPE_CODE_ARRAY
713 && TYPE_VECTOR (type)
714 && tdep->vector_abi == POWERPC_VEC_GENERIC)
716 /* GCC -maltivec -mabi=no-altivec returns vectors in r3/r4/r5/r6.
717 GCC without AltiVec returns them in memory, but it warns about
718 ABI risks in that case; we don't try to support it. */
721 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
723 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
725 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
727 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
732 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
734 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
736 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
738 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
741 return RETURN_VALUE_REGISTER_CONVENTION;
743 if (TYPE_LENGTH (type) == 8
744 && TYPE_CODE (type) == TYPE_CODE_ARRAY
745 && TYPE_VECTOR (type)
746 && tdep->vector_abi == POWERPC_VEC_SPE)
748 /* The e500 ABI places return values for the 64-bit DSP types
749 (__ev64_opaque__) in r3. However, in GDB-speak, ev3
750 corresponds to the entire r3 value for e500, whereas GDB's r3
751 only corresponds to the least significant 32-bits. So place
752 the 64-bit DSP type's value in ev3. */
754 regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf);
756 regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf);
757 return RETURN_VALUE_REGISTER_CONVENTION;
759 if (broken_gcc && TYPE_LENGTH (type) <= 8)
761 /* GCC screwed up for structures or unions whose size is less
762 than or equal to 8 bytes.. Instead of left-aligning, it
763 right-aligns the data into the buffer formed by r3, r4. */
764 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
765 int len = TYPE_LENGTH (type);
766 int offset = (2 * tdep->wordsize - len) % tdep->wordsize;
770 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
771 regvals + 0 * tdep->wordsize);
772 if (len > tdep->wordsize)
773 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
774 regvals + 1 * tdep->wordsize);
775 memcpy (readbuf, regvals + offset, len);
779 memset (regvals, 0, sizeof regvals);
780 memcpy (regvals + offset, writebuf, len);
781 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
782 regvals + 0 * tdep->wordsize);
783 if (len > tdep->wordsize)
784 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
785 regvals + 1 * tdep->wordsize);
788 return RETURN_VALUE_REGISTER_CONVENTION;
790 if (TYPE_LENGTH (type) <= 8)
794 /* This matches SVr4 PPC, it does not match GCC. */
795 /* The value is right-padded to 8 bytes and then loaded, as
796 two "words", into r3/r4. */
797 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
798 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
799 regvals + 0 * tdep->wordsize);
800 if (TYPE_LENGTH (type) > tdep->wordsize)
801 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
802 regvals + 1 * tdep->wordsize);
803 memcpy (readbuf, regvals, TYPE_LENGTH (type));
807 /* This matches SVr4 PPC, it does not match GCC. */
808 /* The value is padded out to 8 bytes and then loaded, as
809 two "words" into r3/r4. */
810 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
811 memset (regvals, 0, sizeof regvals);
812 memcpy (regvals, writebuf, TYPE_LENGTH (type));
813 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
814 regvals + 0 * tdep->wordsize);
815 if (TYPE_LENGTH (type) > tdep->wordsize)
816 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
817 regvals + 1 * tdep->wordsize);
819 return RETURN_VALUE_REGISTER_CONVENTION;
821 return RETURN_VALUE_STRUCT_CONVENTION;
824 enum return_value_convention
825 ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type,
826 struct type *valtype, struct regcache *regcache,
827 gdb_byte *readbuf, const gdb_byte *writebuf)
829 return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
833 enum return_value_convention
834 ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
835 struct type *func_type,
836 struct type *valtype,
837 struct regcache *regcache,
838 gdb_byte *readbuf, const gdb_byte *writebuf)
840 return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
844 /* The helper function for 64-bit SYSV push_dummy_call. Converts the
845 function's code address back into the function's descriptor
848 Find a value for the TOC register. Every symbol should have both
849 ".FN" and "FN" in the minimal symbol table. "FN" points at the
850 FN's descriptor, while ".FN" points at the entry point (which
851 matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the
852 FN's descriptor address (while at the same time being careful to
853 find "FN" in the same object file as ".FN"). */
856 convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr)
858 struct obj_section *dot_fn_section;
859 struct minimal_symbol *dot_fn;
860 struct minimal_symbol *fn;
862 /* Find the minimal symbol that corresponds to CODE_ADDR (should
863 have a name of the form ".FN"). */
864 dot_fn = lookup_minimal_symbol_by_pc (code_addr);
865 if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.')
867 /* Get the section that contains CODE_ADDR. Need this for the
868 "objfile" that it contains. */
869 dot_fn_section = find_pc_section (code_addr);
870 if (dot_fn_section == NULL || dot_fn_section->objfile == NULL)
872 /* Now find the corresponding "FN" (dropping ".") minimal symbol's
873 address. Only look for the minimal symbol in ".FN"'s object file
874 - avoids problems when two object files (i.e., shared libraries)
875 contain a minimal symbol with the same name. */
876 fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL,
877 dot_fn_section->objfile);
880 /* Found a descriptor. */
881 (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn);
885 /* Pass the arguments in either registers, or in the stack. Using the
888 This implements a dumbed down version of the ABI. It always writes
889 values to memory, GPR and FPR, even when not necessary. Doing this
890 greatly simplifies the logic. */
893 ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch,
894 struct value *function,
895 struct regcache *regcache, CORE_ADDR bp_addr,
896 int nargs, struct value **args, CORE_ADDR sp,
897 int struct_return, CORE_ADDR struct_addr)
899 CORE_ADDR func_addr = find_function_addr (function, NULL);
900 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
901 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
903 /* See for-loop comment below. */
905 /* Size of the Altivec's vector parameter region, the final value is
906 computed in the for-loop below. */
907 LONGEST vparam_size = 0;
908 /* Size of the general parameter region, the final value is computed
909 in the for-loop below. */
910 LONGEST gparam_size = 0;
911 /* Kevin writes ... I don't mind seeing tdep->wordsize used in the
912 calls to align_up(), align_down(), etc. because this makes it
913 easier to reuse this code (in a copy/paste sense) in the future,
914 but it is a 64-bit ABI and asserting that the wordsize is 8 bytes
915 at some point makes it easier to verify that this function is
916 correct without having to do a non-local analysis to figure out
917 the possible values of tdep->wordsize. */
918 gdb_assert (tdep->wordsize == 8);
920 /* This function exists to support a calling convention that
921 requires floating-point registers. It shouldn't be used on
922 processors that lack them. */
923 gdb_assert (ppc_floating_point_unit_p (gdbarch));
925 /* By this stage in the proceedings, SP has been decremented by "red
926 zone size" + "struct return size". Fetch the stack-pointer from
927 before this and use that as the BACK_CHAIN. */
928 regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
931 /* Go through the argument list twice.
933 Pass 1: Compute the function call's stack space and register
936 Pass 2: Replay the same computation but this time also write the
937 values out to the target. */
939 for (write_pass = 0; write_pass < 2; write_pass++)
942 /* Next available floating point register for float and double
945 /* Next available general register for non-vector (but possibly
948 /* Next available vector register for vector arguments. */
950 /* The address, at which the next general purpose parameter
951 (integer, struct, float, ...) should be saved. */
953 /* Address, at which the next Altivec vector parameter should be
959 /* During the first pass, GPARAM and VPARAM are more like
960 offsets (start address zero) than addresses. That way
961 they accumulate the total stack space each region
968 /* Decrement the stack pointer making space for the Altivec
969 and general on-stack parameters. Set vparam and gparam
970 to their corresponding regions. */
971 vparam = align_down (sp - vparam_size, 16);
972 gparam = align_down (vparam - gparam_size, 16);
973 /* Add in space for the TOC, link editor double word,
974 compiler double word, LR save area, CR save area. */
975 sp = align_down (gparam - 48, 16);
978 /* If the function is returning a `struct', then there is an
979 extra hidden parameter (which will be passed in r3)
980 containing the address of that struct.. In that case we
981 should advance one word and start from r4 register to copy
982 parameters. This also consumes one on-stack parameter slot. */
986 regcache_cooked_write_signed (regcache,
987 tdep->ppc_gp0_regnum + greg,
990 gparam = align_up (gparam + tdep->wordsize, tdep->wordsize);
993 for (argno = 0; argno < nargs; argno++)
995 struct value *arg = args[argno];
996 struct type *type = check_typedef (value_type (arg));
997 const bfd_byte *val = value_contents (arg);
999 if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8)
1001 /* Floats and Doubles go in f1 .. f13. They also
1002 consume a left aligned GREG,, and can end up in
1006 gdb_byte regval[MAX_REGISTER_SIZE];
1009 /* Version 1.7 of the 64-bit PowerPC ELF ABI says:
1011 "Single precision floating point values are mapped to
1012 the first word in a single doubleword."
1014 And version 1.9 says:
1016 "Single precision floating point values are mapped to
1017 the second word in a single doubleword."
1019 GDB then writes single precision floating point values
1020 at both words in a doubleword, to support both ABIs. */
1021 if (TYPE_LENGTH (type) == 4)
1023 memcpy (regval, val, 4);
1024 memcpy (regval + 4, val, 4);
1030 /* Write value in the stack's parameter save area. */
1031 write_memory (gparam, p, 8);
1035 struct type *regtype
1036 = register_type (gdbarch, tdep->ppc_fp0_regnum);
1038 convert_typed_floating (val, type, regval, regtype);
1039 regcache_cooked_write (regcache,
1040 tdep->ppc_fp0_regnum + freg,
1044 regcache_cooked_write (regcache,
1045 tdep->ppc_gp0_regnum + greg,
1051 /* Always consume parameter stack space. */
1052 gparam = align_up (gparam + 8, tdep->wordsize);
1054 else if (TYPE_CODE (type) == TYPE_CODE_FLT
1055 && TYPE_LENGTH (type) == 16
1056 && (gdbarch_long_double_format (gdbarch)
1057 == floatformats_ibm_long_double))
1059 /* IBM long double stored in two doublewords of the
1060 parameter save area and corresponding registers. */
1063 if (!tdep->soft_float && freg <= 13)
1065 regcache_cooked_write (regcache,
1066 tdep->ppc_fp0_regnum + freg,
1069 regcache_cooked_write (regcache,
1070 tdep->ppc_fp0_regnum + freg + 1,
1075 regcache_cooked_write (regcache,
1076 tdep->ppc_gp0_regnum + greg,
1079 regcache_cooked_write (regcache,
1080 tdep->ppc_gp0_regnum + greg + 1,
1083 write_memory (gparam, val, TYPE_LENGTH (type));
1087 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1089 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT
1090 && TYPE_LENGTH (type) <= 8)
1092 /* 32-bit and 64-bit decimal floats go in f1 .. f13. They can
1093 end up in memory. */
1096 gdb_byte regval[MAX_REGISTER_SIZE];
1099 /* 32-bit decimal floats are right aligned in the
1101 if (TYPE_LENGTH (type) == 4)
1103 memcpy (regval + 4, val, 4);
1109 /* Write value in the stack's parameter save area. */
1110 write_memory (gparam, p, 8);
1113 regcache_cooked_write (regcache,
1114 tdep->ppc_fp0_regnum + freg, p);
1119 /* Always consume parameter stack space. */
1120 gparam = align_up (gparam + 8, tdep->wordsize);
1122 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT &&
1123 TYPE_LENGTH (type) == 16)
1125 /* 128-bit decimal floats go in f2 .. f12, always in even/odd
1126 pairs. They can end up in memory, using two doublewords. */
1131 /* Make sure freg is even. */
1133 regcache_cooked_write (regcache,
1134 tdep->ppc_fp0_regnum + freg, val);
1135 regcache_cooked_write (regcache,
1136 tdep->ppc_fp0_regnum + freg + 1, val + 8);
1139 write_memory (gparam, val, TYPE_LENGTH (type));
1144 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1146 else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type)
1147 && TYPE_CODE (type) == TYPE_CODE_ARRAY
1148 && tdep->ppc_vr0_regnum >= 0)
1150 /* In the Altivec ABI, vectors go in the vector
1151 registers v2 .. v13, or when that runs out, a vector
1152 annex which goes above all the normal parameters.
1153 NOTE: cagney/2003-09-21: This is a guess based on the
1154 PowerOpen Altivec ABI. */
1158 regcache_cooked_write (regcache,
1159 tdep->ppc_vr0_regnum + vreg, val);
1165 write_memory (vparam, val, TYPE_LENGTH (type));
1166 vparam = align_up (vparam + TYPE_LENGTH (type), 16);
1169 else if ((TYPE_CODE (type) == TYPE_CODE_INT
1170 || TYPE_CODE (type) == TYPE_CODE_ENUM
1171 || TYPE_CODE (type) == TYPE_CODE_BOOL
1172 || TYPE_CODE (type) == TYPE_CODE_CHAR
1173 || TYPE_CODE (type) == TYPE_CODE_PTR
1174 || TYPE_CODE (type) == TYPE_CODE_REF)
1175 && TYPE_LENGTH (type) <= 8)
1177 /* Scalars and Pointers get sign[un]extended and go in
1178 gpr3 .. gpr10. They can also end up in memory. */
1181 /* Sign extend the value, then store it unsigned. */
1182 ULONGEST word = unpack_long (type, val);
1183 /* Convert any function code addresses into
1185 if (TYPE_CODE (type) == TYPE_CODE_PTR
1186 || TYPE_CODE (type) == TYPE_CODE_REF)
1188 struct type *target_type;
1189 target_type = check_typedef (TYPE_TARGET_TYPE (type));
1191 if (TYPE_CODE (target_type) == TYPE_CODE_FUNC
1192 || TYPE_CODE (target_type) == TYPE_CODE_METHOD)
1194 CORE_ADDR desc = word;
1195 convert_code_addr_to_desc_addr (word, &desc);
1200 regcache_cooked_write_unsigned (regcache,
1201 tdep->ppc_gp0_regnum +
1203 write_memory_unsigned_integer (gparam, tdep->wordsize,
1207 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1212 for (byte = 0; byte < TYPE_LENGTH (type);
1213 byte += tdep->wordsize)
1215 if (write_pass && greg <= 10)
1217 gdb_byte regval[MAX_REGISTER_SIZE];
1218 int len = TYPE_LENGTH (type) - byte;
1219 if (len > tdep->wordsize)
1220 len = tdep->wordsize;
1221 memset (regval, 0, sizeof regval);
1222 /* The ABI (version 1.9) specifies that values
1223 smaller than one doubleword are right-aligned
1224 and those larger are left-aligned. GCC
1225 versions before 3.4 implemented this
1227 <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
1229 memcpy (regval + tdep->wordsize - len,
1232 memcpy (regval, val + byte, len);
1233 regcache_cooked_write (regcache, greg, regval);
1239 /* WARNING: cagney/2003-09-21: Strictly speaking, this
1240 isn't necessary, unfortunately, GCC appears to get
1241 "struct convention" parameter passing wrong putting
1242 odd sized structures in memory instead of in a
1243 register. Work around this by always writing the
1244 value to memory. Fortunately, doing this
1245 simplifies the code. */
1246 int len = TYPE_LENGTH (type);
1247 if (len < tdep->wordsize)
1248 write_memory (gparam + tdep->wordsize - len, val, len);
1250 write_memory (gparam, val, len);
1253 && TYPE_CODE (type) == TYPE_CODE_STRUCT
1254 && TYPE_NFIELDS (type) == 1
1255 && TYPE_LENGTH (type) <= 16)
1257 /* The ABI (version 1.9) specifies that structs
1258 containing a single floating-point value, at any
1259 level of nesting of single-member structs, are
1260 passed in floating-point registers. */
1261 while (TYPE_CODE (type) == TYPE_CODE_STRUCT
1262 && TYPE_NFIELDS (type) == 1)
1263 type = check_typedef (TYPE_FIELD_TYPE (type, 0));
1264 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1266 if (TYPE_LENGTH (type) <= 8)
1270 gdb_byte regval[MAX_REGISTER_SIZE];
1271 struct type *regtype
1272 = register_type (gdbarch,
1273 tdep->ppc_fp0_regnum);
1274 convert_typed_floating (val, type, regval,
1276 regcache_cooked_write (regcache,
1277 (tdep->ppc_fp0_regnum
1283 else if (TYPE_LENGTH (type) == 16
1284 && (gdbarch_long_double_format (gdbarch)
1285 == floatformats_ibm_long_double))
1289 regcache_cooked_write (regcache,
1290 (tdep->ppc_fp0_regnum
1294 regcache_cooked_write (regcache,
1295 (tdep->ppc_fp0_regnum
1303 /* Always consume parameter stack space. */
1304 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1310 /* Save the true region sizes ready for the second pass. */
1311 vparam_size = vparam;
1312 /* Make certain that the general parameter save area is at
1313 least the minimum 8 registers (or doublewords) in size. */
1315 gparam_size = 8 * tdep->wordsize;
1317 gparam_size = gparam;
1322 regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
1324 /* Write the backchain (it occupies WORDSIZED bytes). */
1325 write_memory_signed_integer (sp, tdep->wordsize, byte_order, back_chain);
1327 /* Point the inferior function call's return address at the dummy's
1329 regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
1331 /* Use the func_addr to find the descriptor, and use that to find
1332 the TOC. If we're calling via a function pointer, the pointer
1333 itself identifies the descriptor. */
1335 struct type *ftype = check_typedef (value_type (function));
1336 CORE_ADDR desc_addr = value_as_address (function);
1338 if (TYPE_CODE (ftype) == TYPE_CODE_PTR
1339 || convert_code_addr_to_desc_addr (func_addr, &desc_addr))
1341 /* The TOC is the second double word in the descriptor. */
1343 read_memory_unsigned_integer (desc_addr + tdep->wordsize,
1344 tdep->wordsize, byte_order);
1345 regcache_cooked_write_unsigned (regcache,
1346 tdep->ppc_gp0_regnum + 2, toc);
1354 /* The 64 bit ABI return value convention.
1356 Return non-zero if the return-value is stored in a register, return
1357 0 if the return-value is instead stored on the stack (a.k.a.,
1358 struct return convention).
1360 For a return-value stored in a register: when WRITEBUF is non-NULL,
1361 copy the buffer to the corresponding register return-value location
1362 location; when READBUF is non-NULL, fill the buffer from the
1363 corresponding register return-value location. */
1364 enum return_value_convention
1365 ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type,
1366 struct type *valtype, struct regcache *regcache,
1367 gdb_byte *readbuf, const gdb_byte *writebuf)
1369 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1370 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1372 /* This function exists to support a calling convention that
1373 requires floating-point registers. It shouldn't be used on
1374 processors that lack them. */
1375 gdb_assert (ppc_floating_point_unit_p (gdbarch));
1377 /* Floats and doubles in F1. */
1378 if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8)
1380 gdb_byte regval[MAX_REGISTER_SIZE];
1381 struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
1382 if (writebuf != NULL)
1384 convert_typed_floating (writebuf, valtype, regval, regtype);
1385 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
1387 if (readbuf != NULL)
1389 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
1390 convert_typed_floating (regval, regtype, readbuf, valtype);
1392 return RETURN_VALUE_REGISTER_CONVENTION;
1394 if (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT)
1395 return get_decimal_float_return_value (gdbarch, valtype, regcache, readbuf,
1397 /* Integers in r3. */
1398 if ((TYPE_CODE (valtype) == TYPE_CODE_INT
1399 || TYPE_CODE (valtype) == TYPE_CODE_ENUM
1400 || TYPE_CODE (valtype) == TYPE_CODE_CHAR
1401 || TYPE_CODE (valtype) == TYPE_CODE_BOOL)
1402 && TYPE_LENGTH (valtype) <= 8)
1404 if (writebuf != NULL)
1406 /* Be careful to sign extend the value. */
1407 regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
1408 unpack_long (valtype, writebuf));
1410 if (readbuf != NULL)
1412 /* Extract the integer from r3. Since this is truncating the
1413 value, there isn't a sign extension problem. */
1415 regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
1417 store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), byte_order,
1420 return RETURN_VALUE_REGISTER_CONVENTION;
1422 /* All pointers live in r3. */
1423 if (TYPE_CODE (valtype) == TYPE_CODE_PTR
1424 || TYPE_CODE (valtype) == TYPE_CODE_REF)
1426 /* All pointers live in r3. */
1427 if (writebuf != NULL)
1428 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
1429 if (readbuf != NULL)
1430 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
1431 return RETURN_VALUE_REGISTER_CONVENTION;
1433 /* Array type has more than one use. */
1434 if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
1436 /* Small character arrays are returned, right justified, in r3. */
1437 if (TYPE_LENGTH (valtype) <= 8
1438 && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
1439 && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
1441 int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3)
1442 - TYPE_LENGTH (valtype));
1443 if (writebuf != NULL)
1444 regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
1445 offset, TYPE_LENGTH (valtype), writebuf);
1446 if (readbuf != NULL)
1447 regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
1448 offset, TYPE_LENGTH (valtype), readbuf);
1449 return RETURN_VALUE_REGISTER_CONVENTION;
1451 /* A VMX vector is returned in v2. */
1452 if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
1453 && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0)
1456 regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
1458 regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2,
1460 return RETURN_VALUE_REGISTER_CONVENTION;
1463 /* Big floating point values get stored in adjacent floating
1464 point registers, starting with F1. */
1465 if (TYPE_CODE (valtype) == TYPE_CODE_FLT
1466 && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32))
1468 if (writebuf || readbuf != NULL)
1471 for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++)
1473 if (writebuf != NULL)
1474 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
1475 (const bfd_byte *) writebuf + i * 8);
1476 if (readbuf != NULL)
1477 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
1478 (bfd_byte *) readbuf + i * 8);
1481 return RETURN_VALUE_REGISTER_CONVENTION;
1483 /* Complex values get returned in f1:f2, need to convert. */
1484 if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
1485 && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16))
1487 if (regcache != NULL)
1490 for (i = 0; i < 2; i++)
1492 gdb_byte regval[MAX_REGISTER_SIZE];
1493 struct type *regtype =
1494 register_type (gdbarch, tdep->ppc_fp0_regnum);
1495 if (writebuf != NULL)
1497 convert_typed_floating ((const bfd_byte *) writebuf +
1498 i * (TYPE_LENGTH (valtype) / 2),
1499 valtype, regval, regtype);
1500 regcache_cooked_write (regcache,
1501 tdep->ppc_fp0_regnum + 1 + i,
1504 if (readbuf != NULL)
1506 regcache_cooked_read (regcache,
1507 tdep->ppc_fp0_regnum + 1 + i,
1509 convert_typed_floating (regval, regtype,
1510 (bfd_byte *) readbuf +
1511 i * (TYPE_LENGTH (valtype) / 2),
1516 return RETURN_VALUE_REGISTER_CONVENTION;
1518 /* Big complex values get stored in f1:f4. */
1519 if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32)
1521 if (regcache != NULL)
1524 for (i = 0; i < 4; i++)
1526 if (writebuf != NULL)
1527 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
1528 (const bfd_byte *) writebuf + i * 8);
1529 if (readbuf != NULL)
1530 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
1531 (bfd_byte *) readbuf + i * 8);
1534 return RETURN_VALUE_REGISTER_CONVENTION;
1536 return RETURN_VALUE_STRUCT_CONVENTION;