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
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);
53 int argspace = 0; /* 0 is an initial wrong guess. */
56 gdb_assert (tdep->wordsize == 4);
58 regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
61 /* Go through the argument list twice.
63 Pass 1: Figure out how much new stack space is required for
64 arguments and pushed values. Unlike the PowerOpen ABI, the SysV
65 ABI doesn't reserve any extra space for parameters which are put
66 in registers, but does always push structures and then pass their
69 Pass 2: Replay the same computation but this time also write the
70 values out to the target. */
72 for (write_pass = 0; write_pass < 2; write_pass++)
75 /* Next available floating point register for float and double
78 /* Next available general register for non-float, non-vector
81 /* Next available vector register for vector arguments. */
83 /* Arguments start above the "LR save word" and "Back chain". */
84 int argoffset = 2 * tdep->wordsize;
85 /* Structures start after the arguments. */
86 int structoffset = argoffset + argspace;
88 /* If the function is returning a `struct', then the first word
89 (which will be passed in r3) is used for struct return
90 address. In that case we should advance one word and start
91 from r4 register to copy parameters. */
95 regcache_cooked_write_signed (regcache,
96 tdep->ppc_gp0_regnum + greg,
101 for (argno = 0; argno < nargs; argno++)
103 struct value *arg = args[argno];
104 struct type *type = check_typedef (value_type (arg));
105 int len = TYPE_LENGTH (type);
106 const bfd_byte *val = value_contents (arg);
108 if (TYPE_CODE (type) == TYPE_CODE_FLT && len <= 8
109 && !tdep->soft_float)
111 /* Floating point value converted to "double" then
112 passed in an FP register, when the registers run out,
113 8 byte aligned stack is used. */
118 /* Always store the floating point value using
119 the register's floating-point format. */
120 gdb_byte regval[MAX_REGISTER_SIZE];
122 = register_type (gdbarch, tdep->ppc_fp0_regnum + freg);
123 convert_typed_floating (val, type, regval, regtype);
124 regcache_cooked_write (regcache,
125 tdep->ppc_fp0_regnum + freg,
132 /* The SysV ABI tells us to convert floats to
133 doubles before writing them to an 8 byte aligned
134 stack location. Unfortunately GCC does not do
135 that, and stores floats into 4 byte aligned
136 locations without converting them to doubles.
137 Since there is no know compiler that actually
138 follows the ABI here, we implement the GCC
141 /* Align to 4 bytes or 8 bytes depending on the type of
142 the argument (float or double). */
143 argoffset = align_up (argoffset, len);
145 write_memory (sp + argoffset, val, len);
149 else if (TYPE_CODE (type) == TYPE_CODE_FLT
152 && (gdbarch_long_double_format (gdbarch)
153 == floatformats_ibm_long_double))
155 /* IBM long double passed in two FP registers if
156 available, otherwise 8-byte aligned stack. */
161 regcache_cooked_write (regcache,
162 tdep->ppc_fp0_regnum + freg,
164 regcache_cooked_write (regcache,
165 tdep->ppc_fp0_regnum + freg + 1,
172 argoffset = align_up (argoffset, 8);
174 write_memory (sp + argoffset, val, len);
179 && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */
180 || TYPE_CODE (type) == TYPE_CODE_FLT)) /* double */
182 /* "long long" or soft-float "double" passed in an odd/even
183 register pair with the low addressed word in the odd
184 register and the high addressed word in the even
185 register, or when the registers run out an 8 byte
186 aligned stack location. */
189 /* Just in case GREG was 10. */
191 argoffset = align_up (argoffset, 8);
193 write_memory (sp + argoffset, val, len);
198 /* Must start on an odd register - r3/r4 etc. */
203 regcache_cooked_write (regcache,
204 tdep->ppc_gp0_regnum + greg + 0,
206 regcache_cooked_write (regcache,
207 tdep->ppc_gp0_regnum + greg + 1,
213 else if (len == 16 && TYPE_CODE (type) == TYPE_CODE_FLT
214 && (gdbarch_long_double_format (gdbarch)
215 == floatformats_ibm_long_double))
217 /* Soft-float IBM long double passed in four consecutive
218 registers, or on the stack. The registers are not
219 necessarily odd/even pairs. */
223 argoffset = align_up (argoffset, 8);
225 write_memory (sp + argoffset, val, len);
232 regcache_cooked_write (regcache,
233 tdep->ppc_gp0_regnum + greg + 0,
235 regcache_cooked_write (regcache,
236 tdep->ppc_gp0_regnum + greg + 1,
238 regcache_cooked_write (regcache,
239 tdep->ppc_gp0_regnum + greg + 2,
241 regcache_cooked_write (regcache,
242 tdep->ppc_gp0_regnum + greg + 3,
248 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len <= 8
249 && !tdep->soft_float)
251 /* 32-bit and 64-bit decimal floats go in f1 .. f8. They can
258 gdb_byte regval[MAX_REGISTER_SIZE];
261 /* 32-bit decimal floats are right aligned in the
263 if (TYPE_LENGTH (type) == 4)
265 memcpy (regval + 4, val, 4);
271 regcache_cooked_write (regcache,
272 tdep->ppc_fp0_regnum + freg, p);
279 argoffset = align_up (argoffset, len);
282 /* Write value in the stack's parameter save area. */
283 write_memory (sp + argoffset, val, len);
288 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len == 16
289 && !tdep->soft_float)
291 /* 128-bit decimal floats go in f2 .. f7, always in even/odd
292 pairs. They can end up in memory, using two doublewords. */
296 /* Make sure freg is even. */
301 regcache_cooked_write (regcache,
302 tdep->ppc_fp0_regnum + freg, val);
303 regcache_cooked_write (regcache,
304 tdep->ppc_fp0_regnum + freg + 1, val + 8);
309 argoffset = align_up (argoffset, 8);
312 write_memory (sp + argoffset, val, 16);
317 /* If a 128-bit decimal float goes to the stack because only f7
318 and f8 are free (thus there's no even/odd register pair
319 available), these registers should be marked as occupied.
320 Hence we increase freg even when writing to memory. */
324 && TYPE_CODE (type) == TYPE_CODE_ARRAY
325 && TYPE_VECTOR (type)
326 && tdep->vector_abi == POWERPC_VEC_ALTIVEC)
328 /* Vector parameter passed in an Altivec register, or
329 when that runs out, 16 byte aligned stack location. */
333 regcache_cooked_write (regcache,
334 tdep->ppc_vr0_regnum + vreg, val);
339 argoffset = align_up (argoffset, 16);
341 write_memory (sp + argoffset, val, 16);
346 && TYPE_CODE (type) == TYPE_CODE_ARRAY
347 && TYPE_VECTOR (type)
348 && tdep->vector_abi == POWERPC_VEC_SPE)
350 /* Vector parameter passed in an e500 register, or when
351 that runs out, 8 byte aligned stack location. Note
352 that since e500 vector and general purpose registers
353 both map onto the same underlying register set, a
354 "greg" and not a "vreg" is consumed here. A cooked
355 write stores the value in the correct locations
356 within the raw register cache. */
360 regcache_cooked_write (regcache,
361 tdep->ppc_ev0_regnum + greg, val);
366 argoffset = align_up (argoffset, 8);
368 write_memory (sp + argoffset, val, 8);
374 /* Reduce the parameter down to something that fits in a
376 gdb_byte word[MAX_REGISTER_SIZE];
377 memset (word, 0, MAX_REGISTER_SIZE);
378 if (len > tdep->wordsize
379 || TYPE_CODE (type) == TYPE_CODE_STRUCT
380 || TYPE_CODE (type) == TYPE_CODE_UNION)
382 /* Structs and large values are put in an
383 aligned stack slot ... */
384 if (TYPE_CODE (type) == TYPE_CODE_ARRAY
385 && TYPE_VECTOR (type)
387 structoffset = align_up (structoffset, 16);
389 structoffset = align_up (structoffset, 8);
392 write_memory (sp + structoffset, val, len);
393 /* ... and then a "word" pointing to that address is
394 passed as the parameter. */
395 store_unsigned_integer (word, tdep->wordsize,
399 else if (TYPE_CODE (type) == TYPE_CODE_INT)
400 /* Sign or zero extend the "int" into a "word". */
401 store_unsigned_integer (word, tdep->wordsize,
402 unpack_long (type, val));
404 /* Always goes in the low address. */
405 memcpy (word, val, len);
406 /* Store that "word" in a register, or on the stack.
407 The words have "4" byte alignment. */
411 regcache_cooked_write (regcache,
412 tdep->ppc_gp0_regnum + greg, word);
417 argoffset = align_up (argoffset, tdep->wordsize);
419 write_memory (sp + argoffset, word, tdep->wordsize);
420 argoffset += tdep->wordsize;
425 /* Compute the actual stack space requirements. */
428 /* Remember the amount of space needed by the arguments. */
429 argspace = argoffset;
430 /* Allocate space for both the arguments and the structures. */
431 sp -= (argoffset + structoffset);
432 /* Ensure that the stack is still 16 byte aligned. */
433 sp = align_down (sp, 16);
436 /* The psABI says that "A caller of a function that takes a
437 variable argument list shall set condition register bit 6 to
438 1 if it passes one or more arguments in the floating-point
439 registers. It is strongly recommended that the caller set the
440 bit to 0 otherwise..." Doing this for normal functions too
446 regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr);
451 regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr);
456 regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
458 /* Write the backchain (it occupies WORDSIZED bytes). */
459 write_memory_signed_integer (sp, tdep->wordsize, saved_sp);
461 /* Point the inferior function call's return address at the dummy's
463 regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
468 /* Handle the return-value conventions for Decimal Floating Point values
469 in both ppc32 and ppc64, which are the same. */
471 get_decimal_float_return_value (struct gdbarch *gdbarch, struct type *valtype,
472 struct regcache *regcache, gdb_byte *readbuf,
473 const gdb_byte *writebuf)
475 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
477 gdb_assert (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT);
479 /* 32-bit and 64-bit decimal floats in f1. */
480 if (TYPE_LENGTH (valtype) <= 8)
482 if (writebuf != NULL)
484 gdb_byte regval[MAX_REGISTER_SIZE];
487 /* 32-bit decimal float is right aligned in the doubleword. */
488 if (TYPE_LENGTH (valtype) == 4)
490 memcpy (regval + 4, writebuf, 4);
496 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, p);
500 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
502 /* Left align 32-bit decimal float. */
503 if (TYPE_LENGTH (valtype) == 4)
504 memcpy (readbuf, readbuf + 4, 4);
507 /* 128-bit decimal floats in f2,f3. */
508 else if (TYPE_LENGTH (valtype) == 16)
510 if (writebuf != NULL || readbuf != NULL)
514 for (i = 0; i < 2; i++)
516 if (writebuf != NULL)
517 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2 + i,
520 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2 + i,
527 internal_error (__FILE__, __LINE__, "Unknown decimal float size.");
529 return RETURN_VALUE_REGISTER_CONVENTION;
532 /* Handle the return-value conventions specified by the SysV 32-bit
533 PowerPC ABI (including all the supplements):
535 no floating-point: floating-point values returned using 32-bit
536 general-purpose registers.
538 Altivec: 128-bit vectors returned using vector registers.
540 e500: 64-bit vectors returned using the full full 64 bit EV
541 register, floating-point values returned using 32-bit
542 general-purpose registers.
544 GCC (broken): Small struct values right (instead of left) aligned
545 when returned in general-purpose registers. */
547 static enum return_value_convention
548 do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type,
549 struct regcache *regcache, gdb_byte *readbuf,
550 const gdb_byte *writebuf, int broken_gcc)
552 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
553 gdb_assert (tdep->wordsize == 4);
554 if (TYPE_CODE (type) == TYPE_CODE_FLT
555 && TYPE_LENGTH (type) <= 8
556 && !tdep->soft_float)
560 /* Floats and doubles stored in "f1". Convert the value to
561 the required type. */
562 gdb_byte regval[MAX_REGISTER_SIZE];
563 struct type *regtype = register_type (gdbarch,
564 tdep->ppc_fp0_regnum + 1);
565 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
566 convert_typed_floating (regval, regtype, readbuf, type);
570 /* Floats and doubles stored in "f1". Convert the value to
571 the register's "double" type. */
572 gdb_byte regval[MAX_REGISTER_SIZE];
573 struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
574 convert_typed_floating (writebuf, type, regval, regtype);
575 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
577 return RETURN_VALUE_REGISTER_CONVENTION;
579 if (TYPE_CODE (type) == TYPE_CODE_FLT
580 && TYPE_LENGTH (type) == 16
582 && (gdbarch_long_double_format (gdbarch) == floatformats_ibm_long_double))
584 /* IBM long double stored in f1 and f2. */
587 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
588 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2,
593 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, writebuf);
594 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2,
597 return RETURN_VALUE_REGISTER_CONVENTION;
599 if (TYPE_CODE (type) == TYPE_CODE_FLT
600 && TYPE_LENGTH (type) == 16
601 && (gdbarch_long_double_format (gdbarch) == floatformats_ibm_long_double))
603 /* Soft-float IBM long double stored in r3, r4, r5, r6. */
606 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
607 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
609 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
611 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
616 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
617 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
619 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
621 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
624 return RETURN_VALUE_REGISTER_CONVENTION;
626 if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
627 || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8))
631 /* A long long, or a double stored in the 32 bit r3/r4. */
632 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
634 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
639 /* A long long, or a double stored in the 32 bit r3/r4. */
640 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
642 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
645 return RETURN_VALUE_REGISTER_CONVENTION;
647 if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && !tdep->soft_float)
648 return get_decimal_float_return_value (gdbarch, type, regcache, readbuf,
650 else if ((TYPE_CODE (type) == TYPE_CODE_INT
651 || TYPE_CODE (type) == TYPE_CODE_CHAR
652 || TYPE_CODE (type) == TYPE_CODE_BOOL
653 || TYPE_CODE (type) == TYPE_CODE_PTR
654 || TYPE_CODE (type) == TYPE_CODE_REF
655 || TYPE_CODE (type) == TYPE_CODE_ENUM)
656 && TYPE_LENGTH (type) <= tdep->wordsize)
660 /* Some sort of integer stored in r3. Since TYPE isn't
661 bigger than the register, sign extension isn't a problem
662 - just do everything unsigned. */
664 regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
666 store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval);
670 /* Some sort of integer stored in r3. Use unpack_long since
671 that should handle any required sign extension. */
672 regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
673 unpack_long (type, writebuf));
675 return RETURN_VALUE_REGISTER_CONVENTION;
677 if (TYPE_LENGTH (type) == 16
678 && TYPE_CODE (type) == TYPE_CODE_ARRAY
679 && TYPE_VECTOR (type)
680 && tdep->vector_abi == POWERPC_VEC_ALTIVEC)
684 /* Altivec places the return value in "v2". */
685 regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
689 /* Altivec places the return value in "v2". */
690 regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, 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_GENERIC)
699 /* GCC -maltivec -mabi=no-altivec returns vectors in r3/r4/r5/r6.
700 GCC without AltiVec returns them in memory, but it warns about
701 ABI risks in that case; we don't try to support it. */
704 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
706 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
708 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
710 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
715 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
717 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
719 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
721 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
724 return RETURN_VALUE_REGISTER_CONVENTION;
726 if (TYPE_LENGTH (type) == 8
727 && TYPE_CODE (type) == TYPE_CODE_ARRAY
728 && TYPE_VECTOR (type)
729 && tdep->vector_abi == POWERPC_VEC_SPE)
731 /* The e500 ABI places return values for the 64-bit DSP types
732 (__ev64_opaque__) in r3. However, in GDB-speak, ev3
733 corresponds to the entire r3 value for e500, whereas GDB's r3
734 only corresponds to the least significant 32-bits. So place
735 the 64-bit DSP type's value in ev3. */
737 regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf);
739 regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf);
740 return RETURN_VALUE_REGISTER_CONVENTION;
742 if (broken_gcc && TYPE_LENGTH (type) <= 8)
744 /* GCC screwed up for structures or unions whose size is less
745 than or equal to 8 bytes.. Instead of left-aligning, it
746 right-aligns the data into the buffer formed by r3, r4. */
747 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
748 int len = TYPE_LENGTH (type);
749 int offset = (2 * tdep->wordsize - len) % tdep->wordsize;
753 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
754 regvals + 0 * tdep->wordsize);
755 if (len > tdep->wordsize)
756 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
757 regvals + 1 * tdep->wordsize);
758 memcpy (readbuf, regvals + offset, len);
762 memset (regvals, 0, sizeof regvals);
763 memcpy (regvals + offset, writebuf, len);
764 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
765 regvals + 0 * tdep->wordsize);
766 if (len > tdep->wordsize)
767 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
768 regvals + 1 * tdep->wordsize);
771 return RETURN_VALUE_REGISTER_CONVENTION;
773 if (TYPE_LENGTH (type) <= 8)
777 /* This matches SVr4 PPC, it does not match GCC. */
778 /* The value is right-padded to 8 bytes and then loaded, as
779 two "words", into r3/r4. */
780 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
781 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
782 regvals + 0 * tdep->wordsize);
783 if (TYPE_LENGTH (type) > tdep->wordsize)
784 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
785 regvals + 1 * tdep->wordsize);
786 memcpy (readbuf, regvals, TYPE_LENGTH (type));
790 /* This matches SVr4 PPC, it does not match GCC. */
791 /* The value is padded out to 8 bytes and then loaded, as
792 two "words" into r3/r4. */
793 gdb_byte regvals[MAX_REGISTER_SIZE * 2];
794 memset (regvals, 0, sizeof regvals);
795 memcpy (regvals, writebuf, TYPE_LENGTH (type));
796 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
797 regvals + 0 * tdep->wordsize);
798 if (TYPE_LENGTH (type) > tdep->wordsize)
799 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
800 regvals + 1 * tdep->wordsize);
802 return RETURN_VALUE_REGISTER_CONVENTION;
804 return RETURN_VALUE_STRUCT_CONVENTION;
807 enum return_value_convention
808 ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type,
809 struct type *valtype, struct regcache *regcache,
810 gdb_byte *readbuf, const gdb_byte *writebuf)
812 return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
816 enum return_value_convention
817 ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
818 struct type *func_type,
819 struct type *valtype,
820 struct regcache *regcache,
821 gdb_byte *readbuf, const gdb_byte *writebuf)
823 return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
827 /* The helper function for 64-bit SYSV push_dummy_call. Converts the
828 function's code address back into the function's descriptor
831 Find a value for the TOC register. Every symbol should have both
832 ".FN" and "FN" in the minimal symbol table. "FN" points at the
833 FN's descriptor, while ".FN" points at the entry point (which
834 matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the
835 FN's descriptor address (while at the same time being careful to
836 find "FN" in the same object file as ".FN"). */
839 convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr)
841 struct obj_section *dot_fn_section;
842 struct minimal_symbol *dot_fn;
843 struct minimal_symbol *fn;
845 /* Find the minimal symbol that corresponds to CODE_ADDR (should
846 have a name of the form ".FN"). */
847 dot_fn = lookup_minimal_symbol_by_pc (code_addr);
848 if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.')
850 /* Get the section that contains CODE_ADDR. Need this for the
851 "objfile" that it contains. */
852 dot_fn_section = find_pc_section (code_addr);
853 if (dot_fn_section == NULL || dot_fn_section->objfile == NULL)
855 /* Now find the corresponding "FN" (dropping ".") minimal symbol's
856 address. Only look for the minimal symbol in ".FN"'s object file
857 - avoids problems when two object files (i.e., shared libraries)
858 contain a minimal symbol with the same name. */
859 fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL,
860 dot_fn_section->objfile);
863 /* Found a descriptor. */
864 (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn);
868 /* Pass the arguments in either registers, or in the stack. Using the
871 This implements a dumbed down version of the ABI. It always writes
872 values to memory, GPR and FPR, even when not necessary. Doing this
873 greatly simplifies the logic. */
876 ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
877 struct regcache *regcache, CORE_ADDR bp_addr,
878 int nargs, struct value **args, CORE_ADDR sp,
879 int struct_return, CORE_ADDR struct_addr)
881 CORE_ADDR func_addr = find_function_addr (function, NULL);
882 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
884 /* See for-loop comment below. */
886 /* Size of the Altivec's vector parameter region, the final value is
887 computed in the for-loop below. */
888 LONGEST vparam_size = 0;
889 /* Size of the general parameter region, the final value is computed
890 in the for-loop below. */
891 LONGEST gparam_size = 0;
892 /* Kevin writes ... I don't mind seeing tdep->wordsize used in the
893 calls to align_up(), align_down(), etc. because this makes it
894 easier to reuse this code (in a copy/paste sense) in the future,
895 but it is a 64-bit ABI and asserting that the wordsize is 8 bytes
896 at some point makes it easier to verify that this function is
897 correct without having to do a non-local analysis to figure out
898 the possible values of tdep->wordsize. */
899 gdb_assert (tdep->wordsize == 8);
901 /* This function exists to support a calling convention that
902 requires floating-point registers. It shouldn't be used on
903 processors that lack them. */
904 gdb_assert (ppc_floating_point_unit_p (gdbarch));
906 /* By this stage in the proceedings, SP has been decremented by "red
907 zone size" + "struct return size". Fetch the stack-pointer from
908 before this and use that as the BACK_CHAIN. */
909 regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
912 /* Go through the argument list twice.
914 Pass 1: Compute the function call's stack space and register
917 Pass 2: Replay the same computation but this time also write the
918 values out to the target. */
920 for (write_pass = 0; write_pass < 2; write_pass++)
923 /* Next available floating point register for float and double
926 /* Next available general register for non-vector (but possibly
929 /* Next available vector register for vector arguments. */
931 /* The address, at which the next general purpose parameter
932 (integer, struct, float, ...) should be saved. */
934 /* Address, at which the next Altivec vector parameter should be
940 /* During the first pass, GPARAM and VPARAM are more like
941 offsets (start address zero) than addresses. That way
942 they accumulate the total stack space each region
949 /* Decrement the stack pointer making space for the Altivec
950 and general on-stack parameters. Set vparam and gparam
951 to their corresponding regions. */
952 vparam = align_down (sp - vparam_size, 16);
953 gparam = align_down (vparam - gparam_size, 16);
954 /* Add in space for the TOC, link editor double word,
955 compiler double word, LR save area, CR save area. */
956 sp = align_down (gparam - 48, 16);
959 /* If the function is returning a `struct', then there is an
960 extra hidden parameter (which will be passed in r3)
961 containing the address of that struct.. In that case we
962 should advance one word and start from r4 register to copy
963 parameters. This also consumes one on-stack parameter slot. */
967 regcache_cooked_write_signed (regcache,
968 tdep->ppc_gp0_regnum + greg,
971 gparam = align_up (gparam + tdep->wordsize, tdep->wordsize);
974 for (argno = 0; argno < nargs; argno++)
976 struct value *arg = args[argno];
977 struct type *type = check_typedef (value_type (arg));
978 const bfd_byte *val = value_contents (arg);
980 if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8)
982 /* Floats and Doubles go in f1 .. f13. They also
983 consume a left aligned GREG,, and can end up in
987 gdb_byte regval[MAX_REGISTER_SIZE];
990 /* Version 1.7 of the 64-bit PowerPC ELF ABI says:
992 "Single precision floating point values are mapped to
993 the first word in a single doubleword."
995 And version 1.9 says:
997 "Single precision floating point values are mapped to
998 the second word in a single doubleword."
1000 GDB then writes single precision floating point values
1001 at both words in a doubleword, to support both ABIs. */
1002 if (TYPE_LENGTH (type) == 4)
1004 memcpy (regval, val, 4);
1005 memcpy (regval + 4, val, 4);
1011 /* Write value in the stack's parameter save area. */
1012 write_memory (gparam, p, 8);
1016 struct type *regtype
1017 = register_type (gdbarch, tdep->ppc_fp0_regnum);
1019 convert_typed_floating (val, type, regval, regtype);
1020 regcache_cooked_write (regcache,
1021 tdep->ppc_fp0_regnum + freg,
1025 regcache_cooked_write (regcache,
1026 tdep->ppc_gp0_regnum + greg,
1032 /* Always consume parameter stack space. */
1033 gparam = align_up (gparam + 8, tdep->wordsize);
1035 else if (TYPE_CODE (type) == TYPE_CODE_FLT
1036 && TYPE_LENGTH (type) == 16
1037 && (gdbarch_long_double_format (gdbarch)
1038 == floatformats_ibm_long_double))
1040 /* IBM long double stored in two doublewords of the
1041 parameter save area and corresponding registers. */
1044 if (!tdep->soft_float && freg <= 13)
1046 regcache_cooked_write (regcache,
1047 tdep->ppc_fp0_regnum + freg,
1050 regcache_cooked_write (regcache,
1051 tdep->ppc_fp0_regnum + freg + 1,
1056 regcache_cooked_write (regcache,
1057 tdep->ppc_gp0_regnum + greg,
1060 regcache_cooked_write (regcache,
1061 tdep->ppc_gp0_regnum + greg + 1,
1064 write_memory (gparam, val, TYPE_LENGTH (type));
1068 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1070 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT
1071 && TYPE_LENGTH (type) <= 8)
1073 /* 32-bit and 64-bit decimal floats go in f1 .. f13. They can
1074 end up in memory. */
1077 gdb_byte regval[MAX_REGISTER_SIZE];
1080 /* 32-bit decimal floats are right aligned in the
1082 if (TYPE_LENGTH (type) == 4)
1084 memcpy (regval + 4, val, 4);
1090 /* Write value in the stack's parameter save area. */
1091 write_memory (gparam, p, 8);
1094 regcache_cooked_write (regcache,
1095 tdep->ppc_fp0_regnum + freg, p);
1100 /* Always consume parameter stack space. */
1101 gparam = align_up (gparam + 8, tdep->wordsize);
1103 else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT &&
1104 TYPE_LENGTH (type) == 16)
1106 /* 128-bit decimal floats go in f2 .. f12, always in even/odd
1107 pairs. They can end up in memory, using two doublewords. */
1112 /* Make sure freg is even. */
1114 regcache_cooked_write (regcache,
1115 tdep->ppc_fp0_regnum + freg, val);
1116 regcache_cooked_write (regcache,
1117 tdep->ppc_fp0_regnum + freg + 1, val + 8);
1120 write_memory (gparam, val, TYPE_LENGTH (type));
1125 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1127 else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type)
1128 && TYPE_CODE (type) == TYPE_CODE_ARRAY
1129 && tdep->ppc_vr0_regnum >= 0)
1131 /* In the Altivec ABI, vectors go in the vector
1132 registers v2 .. v13, or when that runs out, a vector
1133 annex which goes above all the normal parameters.
1134 NOTE: cagney/2003-09-21: This is a guess based on the
1135 PowerOpen Altivec ABI. */
1139 regcache_cooked_write (regcache,
1140 tdep->ppc_vr0_regnum + vreg, val);
1146 write_memory (vparam, val, TYPE_LENGTH (type));
1147 vparam = align_up (vparam + TYPE_LENGTH (type), 16);
1150 else if ((TYPE_CODE (type) == TYPE_CODE_INT
1151 || TYPE_CODE (type) == TYPE_CODE_ENUM
1152 || TYPE_CODE (type) == TYPE_CODE_BOOL
1153 || TYPE_CODE (type) == TYPE_CODE_CHAR
1154 || TYPE_CODE (type) == TYPE_CODE_PTR
1155 || TYPE_CODE (type) == TYPE_CODE_REF)
1156 && TYPE_LENGTH (type) <= 8)
1158 /* Scalars and Pointers get sign[un]extended and go in
1159 gpr3 .. gpr10. They can also end up in memory. */
1162 /* Sign extend the value, then store it unsigned. */
1163 ULONGEST word = unpack_long (type, val);
1164 /* Convert any function code addresses into
1166 if (TYPE_CODE (type) == TYPE_CODE_PTR
1167 || TYPE_CODE (type) == TYPE_CODE_REF)
1169 struct type *target_type;
1170 target_type = check_typedef (TYPE_TARGET_TYPE (type));
1172 if (TYPE_CODE (target_type) == TYPE_CODE_FUNC
1173 || TYPE_CODE (target_type) == TYPE_CODE_METHOD)
1175 CORE_ADDR desc = word;
1176 convert_code_addr_to_desc_addr (word, &desc);
1181 regcache_cooked_write_unsigned (regcache,
1182 tdep->ppc_gp0_regnum +
1184 write_memory_unsigned_integer (gparam, tdep->wordsize,
1188 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1193 for (byte = 0; byte < TYPE_LENGTH (type);
1194 byte += tdep->wordsize)
1196 if (write_pass && greg <= 10)
1198 gdb_byte regval[MAX_REGISTER_SIZE];
1199 int len = TYPE_LENGTH (type) - byte;
1200 if (len > tdep->wordsize)
1201 len = tdep->wordsize;
1202 memset (regval, 0, sizeof regval);
1203 /* The ABI (version 1.9) specifies that values
1204 smaller than one doubleword are right-aligned
1205 and those larger are left-aligned. GCC
1206 versions before 3.4 implemented this
1208 <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
1210 memcpy (regval + tdep->wordsize - len,
1213 memcpy (regval, val + byte, len);
1214 regcache_cooked_write (regcache, greg, regval);
1220 /* WARNING: cagney/2003-09-21: Strictly speaking, this
1221 isn't necessary, unfortunately, GCC appears to get
1222 "struct convention" parameter passing wrong putting
1223 odd sized structures in memory instead of in a
1224 register. Work around this by always writing the
1225 value to memory. Fortunately, doing this
1226 simplifies the code. */
1227 int len = TYPE_LENGTH (type);
1228 if (len < tdep->wordsize)
1229 write_memory (gparam + tdep->wordsize - len, val, len);
1231 write_memory (gparam, val, len);
1234 && TYPE_CODE (type) == TYPE_CODE_STRUCT
1235 && TYPE_NFIELDS (type) == 1
1236 && TYPE_LENGTH (type) <= 16)
1238 /* The ABI (version 1.9) specifies that structs
1239 containing a single floating-point value, at any
1240 level of nesting of single-member structs, are
1241 passed in floating-point registers. */
1242 while (TYPE_CODE (type) == TYPE_CODE_STRUCT
1243 && TYPE_NFIELDS (type) == 1)
1244 type = check_typedef (TYPE_FIELD_TYPE (type, 0));
1245 if (TYPE_CODE (type) == TYPE_CODE_FLT)
1247 if (TYPE_LENGTH (type) <= 8)
1251 gdb_byte regval[MAX_REGISTER_SIZE];
1252 struct type *regtype
1253 = register_type (gdbarch,
1254 tdep->ppc_fp0_regnum);
1255 convert_typed_floating (val, type, regval,
1257 regcache_cooked_write (regcache,
1258 (tdep->ppc_fp0_regnum
1264 else if (TYPE_LENGTH (type) == 16
1265 && (gdbarch_long_double_format (gdbarch)
1266 == floatformats_ibm_long_double))
1270 regcache_cooked_write (regcache,
1271 (tdep->ppc_fp0_regnum
1275 regcache_cooked_write (regcache,
1276 (tdep->ppc_fp0_regnum
1284 /* Always consume parameter stack space. */
1285 gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
1291 /* Save the true region sizes ready for the second pass. */
1292 vparam_size = vparam;
1293 /* Make certain that the general parameter save area is at
1294 least the minimum 8 registers (or doublewords) in size. */
1296 gparam_size = 8 * tdep->wordsize;
1298 gparam_size = gparam;
1303 regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
1305 /* Write the backchain (it occupies WORDSIZED bytes). */
1306 write_memory_signed_integer (sp, tdep->wordsize, back_chain);
1308 /* Point the inferior function call's return address at the dummy's
1310 regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
1312 /* Use the func_addr to find the descriptor, and use that to find
1315 CORE_ADDR desc_addr;
1316 if (convert_code_addr_to_desc_addr (func_addr, &desc_addr))
1318 /* The TOC is the second double word in the descriptor. */
1320 read_memory_unsigned_integer (desc_addr + tdep->wordsize,
1322 regcache_cooked_write_unsigned (regcache,
1323 tdep->ppc_gp0_regnum + 2, toc);
1331 /* The 64 bit ABI return value convention.
1333 Return non-zero if the return-value is stored in a register, return
1334 0 if the return-value is instead stored on the stack (a.k.a.,
1335 struct return convention).
1337 For a return-value stored in a register: when WRITEBUF is non-NULL,
1338 copy the buffer to the corresponding register return-value location
1339 location; when READBUF is non-NULL, fill the buffer from the
1340 corresponding register return-value location. */
1341 enum return_value_convention
1342 ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type,
1343 struct type *valtype, struct regcache *regcache,
1344 gdb_byte *readbuf, const gdb_byte *writebuf)
1346 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1348 /* This function exists to support a calling convention that
1349 requires floating-point registers. It shouldn't be used on
1350 processors that lack them. */
1351 gdb_assert (ppc_floating_point_unit_p (gdbarch));
1353 /* Floats and doubles in F1. */
1354 if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8)
1356 gdb_byte regval[MAX_REGISTER_SIZE];
1357 struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
1358 if (writebuf != NULL)
1360 convert_typed_floating (writebuf, valtype, regval, regtype);
1361 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
1363 if (readbuf != NULL)
1365 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
1366 convert_typed_floating (regval, regtype, readbuf, valtype);
1368 return RETURN_VALUE_REGISTER_CONVENTION;
1370 if (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT)
1371 return get_decimal_float_return_value (gdbarch, valtype, regcache, readbuf,
1373 /* Integers in r3. */
1374 if ((TYPE_CODE (valtype) == TYPE_CODE_INT
1375 || TYPE_CODE (valtype) == TYPE_CODE_ENUM
1376 || TYPE_CODE (valtype) == TYPE_CODE_CHAR
1377 || TYPE_CODE (valtype) == TYPE_CODE_BOOL)
1378 && TYPE_LENGTH (valtype) <= 8)
1380 if (writebuf != NULL)
1382 /* Be careful to sign extend the value. */
1383 regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
1384 unpack_long (valtype, writebuf));
1386 if (readbuf != NULL)
1388 /* Extract the integer from r3. Since this is truncating the
1389 value, there isn't a sign extension problem. */
1391 regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
1393 store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval);
1395 return RETURN_VALUE_REGISTER_CONVENTION;
1397 /* All pointers live in r3. */
1398 if (TYPE_CODE (valtype) == TYPE_CODE_PTR
1399 || TYPE_CODE (valtype) == TYPE_CODE_REF)
1401 /* All pointers live in r3. */
1402 if (writebuf != NULL)
1403 regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
1404 if (readbuf != NULL)
1405 regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
1406 return RETURN_VALUE_REGISTER_CONVENTION;
1408 /* Array type has more than one use. */
1409 if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
1411 /* Small character arrays are returned, right justified, in r3. */
1412 if (TYPE_LENGTH (valtype) <= 8
1413 && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
1414 && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
1416 int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3)
1417 - TYPE_LENGTH (valtype));
1418 if (writebuf != NULL)
1419 regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
1420 offset, TYPE_LENGTH (valtype), writebuf);
1421 if (readbuf != NULL)
1422 regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
1423 offset, TYPE_LENGTH (valtype), readbuf);
1424 return RETURN_VALUE_REGISTER_CONVENTION;
1426 /* A VMX vector is returned in v2. */
1427 if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
1428 && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0)
1431 regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
1433 regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
1434 return RETURN_VALUE_REGISTER_CONVENTION;
1437 /* Big floating point values get stored in adjacent floating
1438 point registers, starting with F1. */
1439 if (TYPE_CODE (valtype) == TYPE_CODE_FLT
1440 && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32))
1442 if (writebuf || readbuf != NULL)
1445 for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++)
1447 if (writebuf != NULL)
1448 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
1449 (const bfd_byte *) writebuf + i * 8);
1450 if (readbuf != NULL)
1451 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
1452 (bfd_byte *) readbuf + i * 8);
1455 return RETURN_VALUE_REGISTER_CONVENTION;
1457 /* Complex values get returned in f1:f2, need to convert. */
1458 if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
1459 && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16))
1461 if (regcache != NULL)
1464 for (i = 0; i < 2; i++)
1466 gdb_byte regval[MAX_REGISTER_SIZE];
1467 struct type *regtype =
1468 register_type (gdbarch, tdep->ppc_fp0_regnum);
1469 if (writebuf != NULL)
1471 convert_typed_floating ((const bfd_byte *) writebuf +
1472 i * (TYPE_LENGTH (valtype) / 2),
1473 valtype, regval, regtype);
1474 regcache_cooked_write (regcache,
1475 tdep->ppc_fp0_regnum + 1 + i,
1478 if (readbuf != NULL)
1480 regcache_cooked_read (regcache,
1481 tdep->ppc_fp0_regnum + 1 + i,
1483 convert_typed_floating (regval, regtype,
1484 (bfd_byte *) readbuf +
1485 i * (TYPE_LENGTH (valtype) / 2),
1490 return RETURN_VALUE_REGISTER_CONVENTION;
1492 /* Big complex values get stored in f1:f4. */
1493 if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32)
1495 if (regcache != NULL)
1498 for (i = 0; i < 4; i++)
1500 if (writebuf != NULL)
1501 regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
1502 (const bfd_byte *) writebuf + i * 8);
1503 if (readbuf != NULL)
1504 regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
1505 (bfd_byte *) readbuf + i * 8);
1508 return RETURN_VALUE_REGISTER_CONVENTION;
1510 return RETURN_VALUE_STRUCT_CONVENTION;
1514 ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch,
1517 /* PPC64 SYSV specifies that the minimal-symbol "FN" should point at
1518 a function-descriptor while the corresponding minimal-symbol
1519 ".FN" should point at the entry point. Consequently, a command
1520 like "break FN" applied to an object file with only minimal
1521 symbols, will insert the breakpoint into the descriptor at "FN"
1522 and not the function at ".FN". Avoid this confusion by adjusting
1523 any attempt to set a descriptor breakpoint into a corresponding
1524 function breakpoint. Note that GDB warns the user when this
1525 adjustment is applied - that's ok as otherwise the user will have
1526 no way of knowing why their breakpoint at "FN" resulted in the
1527 program stopping at ".FN". */
1528 return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target);