1 /* Target-dependent code for SPARC.
3 Copyright 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "arch-utils.h"
25 #include "floatformat.h"
27 #include "frame-base.h"
28 #include "frame-unwind.h"
39 #include "gdb_assert.h"
40 #include "gdb_string.h"
42 #include "sparc-tdep.h"
46 /* This file implements the SPARC 32-bit ABI as defined by the section
47 "Low-Level System Information" of the SPARC Compliance Definition
48 (SCD) 2.4.1, which is the 32-bit System V psABI for SPARC. The SCD
49 lists changes with respect to the original 32-bit psABI as defined
50 in the "System V ABI, SPARC Processor Supplement".
52 Note that if we talk about SunOS, we mean SunOS 4.x, which was
53 BSD-based, which is sometimes (retroactively?) referred to as
54 Solaris 1.x. If we talk about Solaris we mean Solaris 2.x and
55 above (Solaris 7, 8 and 9 are nothing but Solaris 2.7, 2.8 and 2.9
56 suffering from severe version number inflation). Solaris 2.x is
57 also known as SunOS 5.x, since that's what uname(1) says. Solaris
60 /* Please use the sparc32_-prefix for 32-bit specific code, the
61 sparc64_-prefix for 64-bit specific code and the sparc_-prefix for
62 code that can handle both. The 64-bit specific code lives in
63 sparc64-tdep.c; don't add any here. */
65 /* The SPARC Floating-Point Quad-Precision format is similar to
66 big-endian IA-64 Quad-recision format. */
67 #define floatformat_sparc_quad floatformat_ia64_quad_big
69 /* The stack pointer is offset from the stack frame by a BIAS of 2047
70 (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
71 hosts, so undefine it first. */
75 /* Macros to extract fields from SPARC instructions. */
76 #define X_OP(i) (((i) >> 30) & 0x3)
77 #define X_RD(i) (((i) >> 25) & 0x1f)
78 #define X_A(i) (((i) >> 29) & 1)
79 #define X_COND(i) (((i) >> 25) & 0xf)
80 #define X_OP2(i) (((i) >> 22) & 0x7)
81 #define X_IMM22(i) ((i) & 0x3fffff)
82 #define X_OP3(i) (((i) >> 19) & 0x3f)
83 #define X_I(i) (((i) >> 13) & 1)
84 /* Sign extension macros. */
85 #define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000)
86 #define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000)
88 /* Fetch the instruction at PC. Instructions are always big-endian
89 even if the processor operates in little-endian mode. */
92 sparc_fetch_instruction (CORE_ADDR pc)
98 /* If we can't read the instruction at PC, return zero. */
99 if (target_read_memory (pc, buf, sizeof (buf)))
103 for (i = 0; i < sizeof (buf); i++)
104 insn = (insn << 8) | buf[i];
109 /* OpenBSD/sparc includes StackGhost, which according to the author's
110 website http://stackghost.cerias.purdue.edu "... transparently and
111 automatically protects applications' stack frames; more
112 specifically, it guards the return pointers. The protection
113 mechanisms require no application source or binary modification and
114 imposes only a negligible performance penalty."
116 The same website provides the following description of how
119 "StackGhost interfaces with the kernel trap handler that would
120 normally write out registers to the stack and the handler that
121 would read them back in. By XORing a cookie into the
122 return-address saved in the user stack when it is actually written
123 to the stack, and then XOR it out when the return-address is pulled
124 from the stack, StackGhost can cause attacker corrupted return
125 pointers to behave in a manner the attacker cannot predict.
126 StackGhost can also use several unused bits in the return pointer
127 to detect a smashed return pointer and abort the process."
129 For GDB this means that whenever we're reading %i7 from a stack
130 frame's window save area, we'll have to XOR the cookie.
132 More information on StackGuard can be found on in:
134 Mike Frantzen and Mike Shuey. "StackGhost: Hardware Facilitated
135 Stack Protection." 2001. Published in USENIX Security Symposium
138 /* Fetch StackGhost Per-Process XOR cookie. */
141 sparc_fetch_wcookie (void)
143 struct target_ops *ops = ¤t_target;
147 len = target_read_partial (ops, TARGET_OBJECT_WCOOKIE, NULL, buf, 0, 8);
151 /* We should have either an 32-bit or an 64-bit cookie. */
152 gdb_assert (len == 4 || len == 8);
154 return extract_unsigned_integer (buf, len);
158 /* Return the contents if register REGNUM as an address. */
161 sparc_address_from_register (int regnum)
165 regcache_cooked_read_unsigned (current_regcache, regnum, &addr);
170 /* The functions on this page are intended to be used to classify
171 function arguments. */
173 /* Check whether TYPE is "Integral or Pointer". */
176 sparc_integral_or_pointer_p (const struct type *type)
178 switch (TYPE_CODE (type))
184 case TYPE_CODE_RANGE:
186 /* We have byte, half-word, word and extended-word/doubleword
187 integral types. The doubleword is an extension to the
188 original 32-bit ABI by the SCD 2.4.x. */
189 int len = TYPE_LENGTH (type);
190 return (len == 1 || len == 2 || len == 4 || len == 8);
196 /* Allow either 32-bit or 64-bit pointers. */
197 int len = TYPE_LENGTH (type);
198 return (len == 4 || len == 8);
208 /* Check whether TYPE is "Floating". */
211 sparc_floating_p (const struct type *type)
213 switch (TYPE_CODE (type))
217 int len = TYPE_LENGTH (type);
218 return (len == 4 || len == 8 || len == 16);
227 /* Check whether TYPE is "Structure or Union". */
230 sparc_structure_or_union_p (const struct type *type)
232 switch (TYPE_CODE (type))
234 case TYPE_CODE_STRUCT:
235 case TYPE_CODE_UNION:
244 /* Register information. */
246 static const char *sparc32_register_names[] =
248 "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
249 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
250 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
251 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
253 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
254 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
255 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
256 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
258 "y", "psr", "wim", "tbr", "pc", "npc", "fsr", "csr"
261 /* Total number of registers. */
262 #define SPARC32_NUM_REGS ARRAY_SIZE (sparc32_register_names)
264 /* We provide the aliases %d0..%d30 for the floating registers as
265 "psuedo" registers. */
267 static const char *sparc32_pseudo_register_names[] =
269 "d0", "d2", "d4", "d6", "d8", "d10", "d12", "d14",
270 "d16", "d18", "d20", "d22", "d24", "d26", "d28", "d30"
273 /* Total number of pseudo registers. */
274 #define SPARC32_NUM_PSEUDO_REGS ARRAY_SIZE (sparc32_pseudo_register_names)
276 /* Return the name of register REGNUM. */
279 sparc32_register_name (int regnum)
281 if (regnum >= 0 && regnum < SPARC32_NUM_REGS)
282 return sparc32_register_names[regnum];
284 if (regnum < SPARC32_NUM_REGS + SPARC32_NUM_PSEUDO_REGS)
285 return sparc32_pseudo_register_names[regnum - SPARC32_NUM_REGS];
290 /* Return the GDB type object for the "standard" data type of data in
294 sparc32_register_type (struct gdbarch *gdbarch, int regnum)
296 if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
297 return builtin_type_float;
299 if (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM)
300 return builtin_type_double;
302 if (regnum == SPARC_SP_REGNUM || regnum == SPARC_FP_REGNUM)
303 return builtin_type_void_data_ptr;
305 if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM)
306 return builtin_type_void_func_ptr;
308 return builtin_type_int32;
312 sparc32_pseudo_register_read (struct gdbarch *gdbarch,
313 struct regcache *regcache,
314 int regnum, void *buf)
316 gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM);
318 regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM);
319 regcache_raw_read (regcache, regnum, buf);
320 regcache_raw_read (regcache, regnum + 1, ((char *)buf) + 4);
324 sparc32_pseudo_register_write (struct gdbarch *gdbarch,
325 struct regcache *regcache,
326 int regnum, const void *buf)
328 gdb_assert (regnum >= SPARC32_D0_REGNUM && regnum <= SPARC32_D30_REGNUM);
330 regnum = SPARC_F0_REGNUM + 2 * (regnum - SPARC32_D0_REGNUM);
331 regcache_raw_write (regcache, regnum, buf);
332 regcache_raw_write (regcache, regnum + 1, ((const char *)buf) + 4);
337 sparc32_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
338 CORE_ADDR funcaddr, int using_gcc,
339 struct value **args, int nargs,
340 struct type *value_type,
341 CORE_ADDR *real_pc, CORE_ADDR *bp_addr)
346 if (using_struct_return (value_type, using_gcc))
350 /* This is an UNIMP instruction. */
351 store_unsigned_integer (buf, 4, TYPE_LENGTH (value_type) & 0x1fff);
352 write_memory (sp - 8, buf, 4);
360 sparc32_store_arguments (struct regcache *regcache, int nargs,
361 struct value **args, CORE_ADDR sp,
362 int struct_return, CORE_ADDR struct_addr)
364 /* Number of words in the "parameter array". */
365 int num_elements = 0;
369 for (i = 0; i < nargs; i++)
371 struct type *type = value_type (args[i]);
372 int len = TYPE_LENGTH (type);
374 if (sparc_structure_or_union_p (type)
375 || (sparc_floating_p (type) && len == 16))
377 /* Structure, Union and Quad-Precision Arguments. */
380 /* Use doubleword alignment for these values. That's always
381 correct, and wasting a few bytes shouldn't be a problem. */
384 write_memory (sp, VALUE_CONTENTS (args[i]), len);
385 args[i] = value_from_pointer (lookup_pointer_type (type), sp);
388 else if (sparc_floating_p (type))
390 /* Floating arguments. */
391 gdb_assert (len == 4 || len == 8);
392 num_elements += (len / 4);
396 /* Integral and pointer arguments. */
397 gdb_assert (sparc_integral_or_pointer_p (type));
400 args[i] = value_cast (builtin_type_int32, args[i]);
401 num_elements += ((len + 3) / 4);
405 /* Always allocate at least six words. */
406 sp -= max (6, num_elements) * 4;
408 /* The psABI says that "Software convention requires space for the
409 struct/union return value pointer, even if the word is unused." */
412 /* The psABI says that "Although software convention and the
413 operating system require every stack frame to be doubleword
417 for (i = 0; i < nargs; i++)
419 char *valbuf = VALUE_CONTENTS (args[i]);
420 struct type *type = value_type (args[i]);
421 int len = TYPE_LENGTH (type);
423 gdb_assert (len == 4 || len == 8);
427 int regnum = SPARC_O0_REGNUM + element;
429 regcache_cooked_write (regcache, regnum, valbuf);
430 if (len > 4 && element < 5)
431 regcache_cooked_write (regcache, regnum + 1, valbuf + 4);
434 /* Always store the argument in memory. */
435 write_memory (sp + 4 + element * 4, valbuf, len);
439 gdb_assert (element == num_elements);
445 store_unsigned_integer (buf, 4, struct_addr);
446 write_memory (sp, buf, 4);
453 sparc32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
454 struct regcache *regcache, CORE_ADDR bp_addr,
455 int nargs, struct value **args, CORE_ADDR sp,
456 int struct_return, CORE_ADDR struct_addr)
458 CORE_ADDR call_pc = (struct_return ? (bp_addr - 12) : (bp_addr - 8));
460 /* Set return address. */
461 regcache_cooked_write_unsigned (regcache, SPARC_O7_REGNUM, call_pc);
463 /* Set up function arguments. */
464 sp = sparc32_store_arguments (regcache, nargs, args, sp,
465 struct_return, struct_addr);
467 /* Allocate the 16-word window save area. */
470 /* Stack should be doubleword aligned at this point. */
471 gdb_assert (sp % 8 == 0);
473 /* Finally, update the stack pointer. */
474 regcache_cooked_write_unsigned (regcache, SPARC_SP_REGNUM, sp);
480 /* Use the program counter to determine the contents and size of a
481 breakpoint instruction. Return a pointer to a string of bytes that
482 encode a breakpoint instruction, store the length of the string in
483 *LEN and optionally adjust *PC to point to the correct memory
484 location for inserting the breakpoint. */
486 static const unsigned char *
487 sparc_breakpoint_from_pc (CORE_ADDR *pc, int *len)
489 static unsigned char break_insn[] = { 0x91, 0xd0, 0x20, 0x01 };
491 *len = sizeof (break_insn);
496 /* Allocate and initialize a frame cache. */
498 static struct sparc_frame_cache *
499 sparc_alloc_frame_cache (void)
501 struct sparc_frame_cache *cache;
504 cache = FRAME_OBSTACK_ZALLOC (struct sparc_frame_cache);
510 /* Frameless until proven otherwise. */
511 cache->frameless_p = 1;
513 cache->struct_return_p = 0;
519 sparc_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc,
520 struct sparc_frame_cache *cache)
522 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
527 if (current_pc <= pc)
530 /* We have to handle to "Procedure Linkage Table" (PLT) special. On
531 SPARC the linker usually defines a symbol (typically
532 _PROCEDURE_LINKAGE_TABLE_) at the start of the .plt section.
533 This symbol makes us end up here with PC pointing at the start of
534 the PLT and CURRENT_PC probably pointing at a PLT entry. If we
535 would do our normal prologue analysis, we would probably conclude
536 that we've got a frame when in reality we don't, since the
537 dynamic linker patches up the first PLT with some code that
538 starts with a SAVE instruction. Patch up PC such that it points
539 at the start of our PLT entry. */
540 if (tdep->plt_entry_size > 0 && in_plt_section (current_pc, NULL))
541 pc = current_pc - ((current_pc - pc) % tdep->plt_entry_size);
543 insn = sparc_fetch_instruction (pc);
545 /* Recognize a SETHI insn and record its destination. */
546 if (X_OP (insn) == 0 && X_OP2 (insn) == 0x04)
551 insn = sparc_fetch_instruction (pc + 4);
554 /* Allow for an arithmetic operation on DEST or %g1. */
555 if (X_OP (insn) == 2 && X_I (insn)
556 && (X_RD (insn) == 1 || X_RD (insn) == dest))
560 insn = sparc_fetch_instruction (pc + 8);
563 /* Check for the SAVE instruction that sets up the frame. */
564 if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3c)
566 cache->frameless_p = 0;
567 return pc + offset + 4;
574 sparc_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
576 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
577 return frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
580 /* Return PC of first real instruction of the function starting at
584 sparc32_skip_prologue (CORE_ADDR start_pc)
586 struct symtab_and_line sal;
587 CORE_ADDR func_start, func_end;
588 struct sparc_frame_cache cache;
590 /* This is the preferred method, find the end of the prologue by
591 using the debugging information. */
592 if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end))
594 sal = find_pc_line (func_start, 0);
596 if (sal.end < func_end
597 && start_pc <= sal.end)
601 return sparc_analyze_prologue (start_pc, 0xffffffffUL, &cache);
606 struct sparc_frame_cache *
607 sparc_frame_cache (struct frame_info *next_frame, void **this_cache)
609 struct sparc_frame_cache *cache;
614 cache = sparc_alloc_frame_cache ();
617 cache->pc = frame_func_unwind (next_frame);
620 CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
621 sparc_analyze_prologue (cache->pc, addr_in_block, cache);
624 if (cache->frameless_p)
626 /* This function is frameless, so %fp (%i6) holds the frame
627 pointer for our calling frame. Use %sp (%o6) as this frame's
630 frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
634 /* For normal frames, %fp (%i6) holds the frame pointer, the
635 base address for the current stack frame. */
637 frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
643 struct sparc_frame_cache *
644 sparc32_frame_cache (struct frame_info *next_frame, void **this_cache)
646 struct sparc_frame_cache *cache;
652 cache = sparc_frame_cache (next_frame, this_cache);
654 sym = find_pc_function (cache->pc);
657 struct type *type = check_typedef (SYMBOL_TYPE (sym));
658 enum type_code code = TYPE_CODE (type);
660 if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD)
662 type = check_typedef (TYPE_TARGET_TYPE (type));
663 if (sparc_structure_or_union_p (type)
664 || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16))
665 cache->struct_return_p = 1;
673 sparc32_frame_this_id (struct frame_info *next_frame, void **this_cache,
674 struct frame_id *this_id)
676 struct sparc_frame_cache *cache =
677 sparc32_frame_cache (next_frame, this_cache);
679 /* This marks the outermost frame. */
680 if (cache->base == 0)
683 (*this_id) = frame_id_build (cache->base, cache->pc);
687 sparc32_frame_prev_register (struct frame_info *next_frame, void **this_cache,
688 int regnum, int *optimizedp,
689 enum lval_type *lvalp, CORE_ADDR *addrp,
690 int *realnump, void *valuep)
692 struct sparc_frame_cache *cache =
693 sparc32_frame_cache (next_frame, this_cache);
695 if (regnum == SPARC32_PC_REGNUM || regnum == SPARC32_NPC_REGNUM)
703 CORE_ADDR pc = (regnum == SPARC32_NPC_REGNUM) ? 4 : 0;
705 /* If this functions has a Structure, Union or
706 Quad-Precision return value, we have to skip the UNIMP
707 instruction that encodes the size of the structure. */
708 if (cache->struct_return_p)
711 regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM;
712 pc += frame_unwind_register_unsigned (next_frame, regnum) + 8;
713 store_unsigned_integer (valuep, 4, pc);
718 /* Handle StackGhost. */
720 ULONGEST wcookie = sparc_fetch_wcookie ();
722 if (wcookie != 0 && !cache->frameless_p && regnum == SPARC_I7_REGNUM)
730 CORE_ADDR addr = cache->base + (regnum - SPARC_L0_REGNUM) * 4;
733 /* Read the value in from memory. */
734 i7 = get_frame_memory_unsigned (next_frame, addr, 4);
735 store_unsigned_integer (valuep, 4, i7 ^ wcookie);
741 /* The previous frame's `local' and `in' registers have been saved
742 in the register save area. */
743 if (!cache->frameless_p
744 && regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)
747 *lvalp = lval_memory;
748 *addrp = cache->base + (regnum - SPARC_L0_REGNUM) * 4;
752 struct gdbarch *gdbarch = get_frame_arch (next_frame);
754 /* Read the value in from memory. */
755 read_memory (*addrp, valuep, register_size (gdbarch, regnum));
760 /* The previous frame's `out' registers are accessable as the
761 current frame's `in' registers. */
762 if (!cache->frameless_p
763 && regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
764 regnum += (SPARC_I0_REGNUM - SPARC_O0_REGNUM);
767 *lvalp = lval_register;
771 frame_unwind_register (next_frame, (*realnump), valuep);
774 static const struct frame_unwind sparc32_frame_unwind =
777 sparc32_frame_this_id,
778 sparc32_frame_prev_register
781 static const struct frame_unwind *
782 sparc32_frame_sniffer (struct frame_info *next_frame)
784 return &sparc32_frame_unwind;
789 sparc32_frame_base_address (struct frame_info *next_frame, void **this_cache)
791 struct sparc_frame_cache *cache =
792 sparc32_frame_cache (next_frame, this_cache);
797 static const struct frame_base sparc32_frame_base =
799 &sparc32_frame_unwind,
800 sparc32_frame_base_address,
801 sparc32_frame_base_address,
802 sparc32_frame_base_address
805 static struct frame_id
806 sparc_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
810 sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
811 return frame_id_build (sp, frame_pc_unwind (next_frame));
815 /* Extract from an array REGBUF containing the (raw) register state, a
816 function return value of TYPE, and copy that into VALBUF. */
819 sparc32_extract_return_value (struct type *type, struct regcache *regcache,
822 int len = TYPE_LENGTH (type);
825 gdb_assert (!sparc_structure_or_union_p (type));
826 gdb_assert (!(sparc_floating_p (type) && len == 16));
828 if (sparc_floating_p (type))
830 /* Floating return values. */
831 regcache_cooked_read (regcache, SPARC_F0_REGNUM, buf);
833 regcache_cooked_read (regcache, SPARC_F1_REGNUM, buf + 4);
834 memcpy (valbuf, buf, len);
838 /* Integral and pointer return values. */
839 gdb_assert (sparc_integral_or_pointer_p (type));
841 regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf);
844 regcache_cooked_read (regcache, SPARC_O1_REGNUM, buf + 4);
845 gdb_assert (len == 8);
846 memcpy (valbuf, buf, 8);
850 /* Just stripping off any unused bytes should preserve the
851 signed-ness just fine. */
852 memcpy (valbuf, buf + 4 - len, len);
857 /* Write into the appropriate registers a function return value stored
858 in VALBUF of type TYPE. */
861 sparc32_store_return_value (struct type *type, struct regcache *regcache,
864 int len = TYPE_LENGTH (type);
867 gdb_assert (!sparc_structure_or_union_p (type));
868 gdb_assert (!(sparc_floating_p (type) && len == 16));
870 if (sparc_floating_p (type))
872 /* Floating return values. */
873 memcpy (buf, valbuf, len);
874 regcache_cooked_write (regcache, SPARC_F0_REGNUM, buf);
876 regcache_cooked_write (regcache, SPARC_F1_REGNUM, buf + 4);
880 /* Integral and pointer return values. */
881 gdb_assert (sparc_integral_or_pointer_p (type));
885 gdb_assert (len == 8);
886 memcpy (buf, valbuf, 8);
887 regcache_cooked_write (regcache, SPARC_O1_REGNUM, buf + 4);
891 /* ??? Do we need to do any sign-extension here? */
892 memcpy (buf + 4 - len, valbuf, len);
894 regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf);
898 static enum return_value_convention
899 sparc32_return_value (struct gdbarch *gdbarch, struct type *type,
900 struct regcache *regcache, void *readbuf,
901 const void *writebuf)
903 if (sparc_structure_or_union_p (type)
904 || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16))
905 return RETURN_VALUE_STRUCT_CONVENTION;
908 sparc32_extract_return_value (type, regcache, readbuf);
910 sparc32_store_return_value (type, regcache, writebuf);
912 return RETURN_VALUE_REGISTER_CONVENTION;
916 /* NOTE: cagney/2004-01-17: For the moment disable this method. The
917 architecture and CORE-gdb will need new code (and a replacement for
918 DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS) before this can be made to
919 work robustly. Here is a possible function signature: */
920 /* NOTE: cagney/2004-01-17: So far only the 32-bit SPARC ABI has been
921 identifed as having a way to robustly recover the address of a
922 struct-convention return-value (after the function has returned).
923 For all other ABIs so far examined, the calling convention makes no
924 guarenteed that the register containing the return-value will be
925 preserved and hence that the return-value's address can be
927 /* Extract from REGCACHE, which contains the (raw) register state, the
928 address in which a function should return its structure value, as a
932 sparc32_extract_struct_value_address (struct regcache *regcache)
936 regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
937 return read_memory_unsigned_integer (sp + 64, 4);
942 sparc32_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
944 return (sparc_structure_or_union_p (type)
945 || (sparc_floating_p (type) && TYPE_LENGTH (type) == 16));
949 /* The SPARC Architecture doesn't have hardware single-step support,
950 and most operating systems don't implement it either, so we provide
951 software single-step mechanism. */
954 sparc_analyze_control_transfer (CORE_ADDR pc, CORE_ADDR *npc)
956 unsigned long insn = sparc_fetch_instruction (pc);
957 int conditional_p = X_COND (insn) & 0x7;
959 long offset = 0; /* Must be signed for sign-extend. */
961 if (X_OP (insn) == 0 && X_OP2 (insn) == 3 && (insn & 0x1000000) == 0)
963 /* Branch on Integer Register with Prediction (BPr). */
967 else if (X_OP (insn) == 0 && X_OP2 (insn) == 6)
969 /* Branch on Floating-Point Condition Codes (FBfcc). */
971 offset = 4 * X_DISP22 (insn);
973 else if (X_OP (insn) == 0 && X_OP2 (insn) == 5)
975 /* Branch on Floating-Point Condition Codes with Prediction
978 offset = 4 * X_DISP19 (insn);
980 else if (X_OP (insn) == 0 && X_OP2 (insn) == 2)
982 /* Branch on Integer Condition Codes (Bicc). */
984 offset = 4 * X_DISP22 (insn);
986 else if (X_OP (insn) == 0 && X_OP2 (insn) == 1)
988 /* Branch on Integer Condition Codes with Prediction (BPcc). */
990 offset = 4 * X_DISP19 (insn);
993 /* FIXME: Handle DONE and RETRY instructions. */
995 /* FIXME: Handle the Trap instruction. */
1001 /* For conditional branches, return nPC + 4 iff the annul
1003 return (X_A (insn) ? *npc + 4 : 0);
1007 /* For unconditional branches, return the target if its
1008 specified condition is "always" and return nPC + 4 if the
1009 condition is "never". If the annul bit is 1, set *NPC to
1011 if (X_COND (insn) == 0x0)
1012 pc = *npc, offset = 4;
1016 gdb_assert (offset != 0);
1025 sparc_software_single_step (enum target_signal sig, int insert_breakpoints_p)
1027 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
1028 static CORE_ADDR npc, nnpc;
1029 static char npc_save[4], nnpc_save[4];
1031 if (insert_breakpoints_p)
1035 pc = sparc_address_from_register (tdep->pc_regnum);
1036 npc = sparc_address_from_register (tdep->npc_regnum);
1038 /* Analyze the instruction at PC. */
1039 nnpc = sparc_analyze_control_transfer (pc, &npc);
1041 target_insert_breakpoint (npc, npc_save);
1043 target_insert_breakpoint (nnpc, nnpc_save);
1045 /* Assert that we have set at least one breakpoint, and that
1046 they're not set at the same spot. */
1047 gdb_assert (npc != 0 || nnpc != 0);
1048 gdb_assert (nnpc != npc);
1053 target_remove_breakpoint (npc, npc_save);
1055 target_remove_breakpoint (nnpc, nnpc_save);
1060 sparc_write_pc (CORE_ADDR pc, ptid_t ptid)
1062 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
1064 write_register_pid (tdep->pc_regnum, pc, ptid);
1065 write_register_pid (tdep->npc_regnum, pc + 4, ptid);
1068 /* Unglobalize NAME. */
1071 sparc_stabs_unglobalize_name (char *name)
1073 /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop,
1074 SunPRO) convert file static variables into global values, a
1075 process known as globalization. In order to do this, the
1076 compiler will create a unique prefix and prepend it to each file
1077 static variable. For static variables within a function, this
1078 globalization prefix is followed by the function name (nested
1079 static variables within a function are supposed to generate a
1080 warning message, and are left alone). The procedure is
1081 documented in the Stabs Interface Manual, which is distrubuted
1082 with the compilers, although version 4.0 of the manual seems to
1083 be incorrect in some places, at least for SPARC. The
1084 globalization prefix is encoded into an N_OPT stab, with the form
1085 "G=<prefix>". The globalization prefix always seems to start
1086 with a dollar sign '$'; a dot '.' is used as a seperator. So we
1087 simply strip everything up until the last dot. */
1091 char *p = strrchr (name, '.');
1100 /* Return the appropriate register set for the core section identified
1101 by SECT_NAME and SECT_SIZE. */
1103 const struct regset *
1104 sparc_regset_from_core_section (struct gdbarch *gdbarch,
1105 const char *sect_name, size_t sect_size)
1107 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1109 if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)
1110 return tdep->gregset;
1112 if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)
1113 return tdep->fpregset;
1119 static struct gdbarch *
1120 sparc32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1122 struct gdbarch_tdep *tdep;
1123 struct gdbarch *gdbarch;
1125 /* If there is already a candidate, use it. */
1126 arches = gdbarch_list_lookup_by_info (arches, &info);
1128 return arches->gdbarch;
1130 /* Allocate space for the new architecture. */
1131 tdep = XMALLOC (struct gdbarch_tdep);
1132 gdbarch = gdbarch_alloc (&info, tdep);
1134 tdep->pc_regnum = SPARC32_PC_REGNUM;
1135 tdep->npc_regnum = SPARC32_NPC_REGNUM;
1136 tdep->gregset = NULL;
1137 tdep->sizeof_gregset = 0;
1138 tdep->fpregset = NULL;
1139 tdep->sizeof_fpregset = 0;
1140 tdep->plt_entry_size = 0;
1142 set_gdbarch_long_double_bit (gdbarch, 128);
1143 set_gdbarch_long_double_format (gdbarch, &floatformat_sparc_quad);
1145 set_gdbarch_num_regs (gdbarch, SPARC32_NUM_REGS);
1146 set_gdbarch_register_name (gdbarch, sparc32_register_name);
1147 set_gdbarch_register_type (gdbarch, sparc32_register_type);
1148 set_gdbarch_num_pseudo_regs (gdbarch, SPARC32_NUM_PSEUDO_REGS);
1149 set_gdbarch_pseudo_register_read (gdbarch, sparc32_pseudo_register_read);
1150 set_gdbarch_pseudo_register_write (gdbarch, sparc32_pseudo_register_write);
1152 /* Register numbers of various important registers. */
1153 set_gdbarch_sp_regnum (gdbarch, SPARC_SP_REGNUM); /* %sp */
1154 set_gdbarch_pc_regnum (gdbarch, SPARC32_PC_REGNUM); /* %pc */
1155 set_gdbarch_fp0_regnum (gdbarch, SPARC_F0_REGNUM); /* %f0 */
1157 /* Call dummy code. */
1158 set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
1159 set_gdbarch_push_dummy_code (gdbarch, sparc32_push_dummy_code);
1160 set_gdbarch_push_dummy_call (gdbarch, sparc32_push_dummy_call);
1162 set_gdbarch_return_value (gdbarch, sparc32_return_value);
1163 set_gdbarch_stabs_argument_has_addr
1164 (gdbarch, sparc32_stabs_argument_has_addr);
1166 set_gdbarch_skip_prologue (gdbarch, sparc32_skip_prologue);
1168 /* Stack grows downward. */
1169 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1171 set_gdbarch_breakpoint_from_pc (gdbarch, sparc_breakpoint_from_pc);
1173 set_gdbarch_frame_args_skip (gdbarch, 8);
1175 set_gdbarch_print_insn (gdbarch, print_insn_sparc);
1177 set_gdbarch_software_single_step (gdbarch, sparc_software_single_step);
1178 set_gdbarch_write_pc (gdbarch, sparc_write_pc);
1180 set_gdbarch_unwind_dummy_id (gdbarch, sparc_unwind_dummy_id);
1182 set_gdbarch_unwind_pc (gdbarch, sparc_unwind_pc);
1184 frame_base_set_default (gdbarch, &sparc32_frame_base);
1186 /* Hook in ABI-specific overrides, if they have been registered. */
1187 gdbarch_init_osabi (info, gdbarch);
1189 frame_unwind_append_sniffer (gdbarch, sparc32_frame_sniffer);
1191 /* If we have register sets, enable the generic core file support. */
1193 set_gdbarch_regset_from_core_section (gdbarch,
1194 sparc_regset_from_core_section);
1199 /* Helper functions for dealing with register windows. */
1202 sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum)
1210 /* Registers are 64-bit. */
1213 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1215 if (regnum == i || regnum == -1)
1217 target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8);
1218 regcache_raw_supply (regcache, i, buf);
1224 /* Registers are 32-bit. Toss any sign-extension of the stack
1228 /* Clear out the top half of the temporary buffer, and put the
1229 register value in the bottom half if we're in 64-bit mode. */
1230 if (gdbarch_ptr_bit (current_gdbarch) == 64)
1236 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1238 if (regnum == i || regnum == -1)
1240 target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 4),
1243 /* Handle StackGhost. */
1244 if (i == SPARC_I7_REGNUM)
1246 ULONGEST wcookie = sparc_fetch_wcookie ();
1247 ULONGEST i7 = extract_unsigned_integer (buf + offset, 4);
1249 store_unsigned_integer (buf + offset, 4, i7 ^ wcookie);
1252 regcache_raw_supply (regcache, i, buf);
1259 sparc_collect_rwindow (const struct regcache *regcache,
1260 CORE_ADDR sp, int regnum)
1268 /* Registers are 64-bit. */
1271 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1273 if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i)
1275 regcache_raw_collect (regcache, i, buf);
1276 target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8);
1282 /* Registers are 32-bit. Toss any sign-extension of the stack
1286 /* Only use the bottom half if we're in 64-bit mode. */
1287 if (gdbarch_ptr_bit (current_gdbarch) == 64)
1290 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1292 if (regnum == -1 || regnum == SPARC_SP_REGNUM || regnum == i)
1294 regcache_raw_collect (regcache, i, buf);
1296 /* Handle StackGhost. */
1297 if (i == SPARC_I7_REGNUM)
1299 ULONGEST wcookie = sparc_fetch_wcookie ();
1300 ULONGEST i7 = extract_unsigned_integer (buf + offset, 4);
1302 store_unsigned_integer (buf + offset, 4, i7 ^ wcookie);
1305 target_write_memory (sp + ((i - SPARC_L0_REGNUM) * 4),
1312 /* Helper functions for dealing with register sets. */
1315 sparc32_supply_gregset (const struct sparc_gregset *gregset,
1316 struct regcache *regcache,
1317 int regnum, const void *gregs)
1319 const char *regs = gregs;
1322 if (regnum == SPARC32_PSR_REGNUM || regnum == -1)
1323 regcache_raw_supply (regcache, SPARC32_PSR_REGNUM,
1324 regs + gregset->r_psr_offset);
1326 if (regnum == SPARC32_PC_REGNUM || regnum == -1)
1327 regcache_raw_supply (regcache, SPARC32_PC_REGNUM,
1328 regs + gregset->r_pc_offset);
1330 if (regnum == SPARC32_NPC_REGNUM || regnum == -1)
1331 regcache_raw_supply (regcache, SPARC32_NPC_REGNUM,
1332 regs + gregset->r_npc_offset);
1334 if (regnum == SPARC32_Y_REGNUM || regnum == -1)
1335 regcache_raw_supply (regcache, SPARC32_Y_REGNUM,
1336 regs + gregset->r_y_offset);
1338 if (regnum == SPARC_G0_REGNUM || regnum == -1)
1339 regcache_raw_supply (regcache, SPARC_G0_REGNUM, NULL);
1341 if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1)
1343 int offset = gregset->r_g1_offset;
1345 for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++)
1347 if (regnum == i || regnum == -1)
1348 regcache_raw_supply (regcache, i, regs + offset);
1353 if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1)
1355 /* Not all of the register set variants include Locals and
1356 Inputs. For those that don't, we read them off the stack. */
1357 if (gregset->r_l0_offset == -1)
1361 regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
1362 sparc_supply_rwindow (regcache, sp, regnum);
1366 int offset = gregset->r_l0_offset;
1368 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1370 if (regnum == i || regnum == -1)
1371 regcache_raw_supply (regcache, i, regs + offset);
1379 sparc32_collect_gregset (const struct sparc_gregset *gregset,
1380 const struct regcache *regcache,
1381 int regnum, void *gregs)
1386 if (regnum == SPARC32_PSR_REGNUM || regnum == -1)
1387 regcache_raw_collect (regcache, SPARC32_PSR_REGNUM,
1388 regs + gregset->r_psr_offset);
1390 if (regnum == SPARC32_PC_REGNUM || regnum == -1)
1391 regcache_raw_collect (regcache, SPARC32_PC_REGNUM,
1392 regs + gregset->r_pc_offset);
1394 if (regnum == SPARC32_NPC_REGNUM || regnum == -1)
1395 regcache_raw_collect (regcache, SPARC32_NPC_REGNUM,
1396 regs + gregset->r_npc_offset);
1398 if (regnum == SPARC32_Y_REGNUM || regnum == -1)
1399 regcache_raw_collect (regcache, SPARC32_Y_REGNUM,
1400 regs + gregset->r_y_offset);
1402 if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_O7_REGNUM) || regnum == -1)
1404 int offset = gregset->r_g1_offset;
1406 /* %g0 is always zero. */
1407 for (i = SPARC_G1_REGNUM; i <= SPARC_O7_REGNUM; i++)
1409 if (regnum == i || regnum == -1)
1410 regcache_raw_collect (regcache, i, regs + offset);
1415 if ((regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM) || regnum == -1)
1417 /* Not all of the register set variants include Locals and
1418 Inputs. For those that don't, we read them off the stack. */
1419 if (gregset->r_l0_offset != -1)
1421 int offset = gregset->r_l0_offset;
1423 for (i = SPARC_L0_REGNUM; i <= SPARC_I7_REGNUM; i++)
1425 if (regnum == i || regnum == -1)
1426 regcache_raw_collect (regcache, i, regs + offset);
1434 sparc32_supply_fpregset (struct regcache *regcache,
1435 int regnum, const void *fpregs)
1437 const char *regs = fpregs;
1440 for (i = 0; i < 32; i++)
1442 if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1)
1443 regcache_raw_supply (regcache, SPARC_F0_REGNUM + i, regs + (i * 4));
1446 if (regnum == SPARC32_FSR_REGNUM || regnum == -1)
1447 regcache_raw_supply (regcache, SPARC32_FSR_REGNUM, regs + (32 * 4) + 4);
1451 sparc32_collect_fpregset (const struct regcache *regcache,
1452 int regnum, void *fpregs)
1454 char *regs = fpregs;
1457 for (i = 0; i < 32; i++)
1459 if (regnum == (SPARC_F0_REGNUM + i) || regnum == -1)
1460 regcache_raw_collect (regcache, SPARC_F0_REGNUM + i, regs + (i * 4));
1463 if (regnum == SPARC32_FSR_REGNUM || regnum == -1)
1464 regcache_raw_collect (regcache, SPARC32_FSR_REGNUM, regs + (32 * 4) + 4);
1470 /* From <machine/reg.h>. */
1471 const struct sparc_gregset sparc32_sunos4_gregset =
1484 /* Provide a prototype to silence -Wmissing-prototypes. */
1485 void _initialize_sparc_tdep (void);
1488 _initialize_sparc_tdep (void)
1490 register_gdbarch_init (bfd_arch_sparc, sparc32_gdbarch_init);