1 /* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 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. */
25 #include "frame-unwind.h"
26 #include "frame-base.h"
27 #include "dwarf2-frame.h"
36 #include "gdb_string.h"
39 #include "reggroups.h"
40 #include "arch-utils.h"
46 #include "alpha-tdep.h"
50 alpha_register_name (int regno
)
52 static const char * const register_names
[] =
54 "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",
55 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",
56 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9",
57 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero",
58 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
59 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
60 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
61 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr",
67 if (regno
>= (sizeof(register_names
) / sizeof(*register_names
)))
69 return register_names
[regno
];
73 alpha_cannot_fetch_register (int regno
)
75 return regno
== ALPHA_ZERO_REGNUM
;
79 alpha_cannot_store_register (int regno
)
81 return regno
== ALPHA_ZERO_REGNUM
;
85 alpha_register_type (struct gdbarch
*gdbarch
, int regno
)
87 if (regno
== ALPHA_SP_REGNUM
|| regno
== ALPHA_GP_REGNUM
)
88 return builtin_type_void_data_ptr
;
89 if (regno
== ALPHA_PC_REGNUM
)
90 return builtin_type_void_func_ptr
;
92 /* Don't need to worry about little vs big endian until
93 some jerk tries to port to alpha-unicosmk. */
94 if (regno
>= ALPHA_FP0_REGNUM
&& regno
< ALPHA_FP0_REGNUM
+ 31)
95 return builtin_type_ieee_double_little
;
97 return builtin_type_int64
;
100 /* Is REGNUM a member of REGGROUP? */
103 alpha_register_reggroup_p (struct gdbarch
*gdbarch
, int regnum
,
104 struct reggroup
*group
)
106 /* Filter out any registers eliminated, but whose regnum is
107 reserved for backward compatibility, e.g. the vfp. */
108 if (REGISTER_NAME (regnum
) == NULL
|| *REGISTER_NAME (regnum
) == '\0')
111 if (group
== all_reggroup
)
114 /* Zero should not be saved or restored. Technically it is a general
115 register (just as $f31 would be a float if we represented it), but
116 there's no point displaying it during "info regs", so leave it out
117 of all groups except for "all". */
118 if (regnum
== ALPHA_ZERO_REGNUM
)
121 /* All other registers are saved and restored. */
122 if (group
== save_reggroup
|| group
== restore_reggroup
)
125 /* All other groups are non-overlapping. */
127 /* Since this is really a PALcode memory slot... */
128 if (regnum
== ALPHA_UNIQUE_REGNUM
)
129 return group
== system_reggroup
;
131 /* Force the FPCR to be considered part of the floating point state. */
132 if (regnum
== ALPHA_FPCR_REGNUM
)
133 return group
== float_reggroup
;
135 if (regnum
>= ALPHA_FP0_REGNUM
&& regnum
< ALPHA_FP0_REGNUM
+ 31)
136 return group
== float_reggroup
;
138 return group
== general_reggroup
;
142 alpha_register_byte (int regno
)
148 alpha_register_raw_size (int regno
)
154 alpha_register_virtual_size (int regno
)
159 /* The following represents exactly the conversion performed by
160 the LDS instruction. This applies to both single-precision
161 floating point and 32-bit integers. */
164 alpha_lds (void *out
, const void *in
)
166 ULONGEST mem
= extract_unsigned_integer (in
, 4);
167 ULONGEST frac
= (mem
>> 0) & 0x7fffff;
168 ULONGEST sign
= (mem
>> 31) & 1;
169 ULONGEST exp_msb
= (mem
>> 30) & 1;
170 ULONGEST exp_low
= (mem
>> 23) & 0x7f;
173 exp
= (exp_msb
<< 10) | exp_low
;
185 reg
= (sign
<< 63) | (exp
<< 52) | (frac
<< 29);
186 store_unsigned_integer (out
, 8, reg
);
189 /* Similarly, this represents exactly the conversion performed by
190 the STS instruction. */
193 alpha_sts (void *out
, const void *in
)
197 reg
= extract_unsigned_integer (in
, 8);
198 mem
= ((reg
>> 32) & 0xc0000000) | ((reg
>> 29) & 0x3fffffff);
199 store_unsigned_integer (out
, 4, mem
);
202 /* The alpha needs a conversion between register and memory format if the
203 register is a floating point register and memory format is float, as the
204 register format must be double or memory format is an integer with 4
205 bytes or less, as the representation of integers in floating point
206 registers is different. */
209 alpha_convert_register_p (int regno
, struct type
*type
)
211 return (regno
>= ALPHA_FP0_REGNUM
&& regno
< ALPHA_FP0_REGNUM
+ 31);
215 alpha_register_to_value (struct frame_info
*frame
, int regnum
,
216 struct type
*valtype
, void *out
)
218 char in
[MAX_REGISTER_SIZE
];
219 frame_register_read (frame
, regnum
, in
);
220 switch (TYPE_LENGTH (valtype
))
229 error ("Cannot retrieve value from floating point register");
234 alpha_value_to_register (struct frame_info
*frame
, int regnum
,
235 struct type
*valtype
, const void *in
)
237 char out
[MAX_REGISTER_SIZE
];
238 switch (TYPE_LENGTH (valtype
))
247 error ("Cannot store value in floating point register");
249 put_frame_register (frame
, regnum
, out
);
253 /* The alpha passes the first six arguments in the registers, the rest on
254 the stack. The register arguments are stored in ARG_REG_BUFFER, and
255 then moved into the register file; this simplifies the passing of a
256 large struct which extends from the registers to the stack, plus avoids
257 three ptrace invocations per word.
259 We don't bother tracking which register values should go in integer
260 regs or fp regs; we load the same values into both.
262 If the called function is returning a structure, the address of the
263 structure to be returned is passed as a hidden first argument. */
266 alpha_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
267 struct regcache
*regcache
, CORE_ADDR bp_addr
,
268 int nargs
, struct value
**args
, CORE_ADDR sp
,
269 int struct_return
, CORE_ADDR struct_addr
)
272 int accumulate_size
= struct_return
? 8 : 0;
279 struct alpha_arg
*alpha_args
280 = (struct alpha_arg
*) alloca (nargs
* sizeof (struct alpha_arg
));
281 register struct alpha_arg
*m_arg
;
282 char arg_reg_buffer
[ALPHA_REGISTER_SIZE
* ALPHA_NUM_ARG_REGS
];
283 int required_arg_regs
;
285 /* The ABI places the address of the called function in T12. */
286 regcache_cooked_write_signed (regcache
, ALPHA_T12_REGNUM
, func_addr
);
288 /* Set the return address register to point to the entry point
289 of the program, where a breakpoint lies in wait. */
290 regcache_cooked_write_signed (regcache
, ALPHA_RA_REGNUM
, bp_addr
);
292 /* Lay out the arguments in memory. */
293 for (i
= 0, m_arg
= alpha_args
; i
< nargs
; i
++, m_arg
++)
295 struct value
*arg
= args
[i
];
296 struct type
*arg_type
= check_typedef (VALUE_TYPE (arg
));
298 /* Cast argument to long if necessary as the compiler does it too. */
299 switch (TYPE_CODE (arg_type
))
304 case TYPE_CODE_RANGE
:
306 if (TYPE_LENGTH (arg_type
) == 4)
308 /* 32-bit values must be sign-extended to 64 bits
309 even if the base data type is unsigned. */
310 arg_type
= builtin_type_int32
;
311 arg
= value_cast (arg_type
, arg
);
313 if (TYPE_LENGTH (arg_type
) < ALPHA_REGISTER_SIZE
)
315 arg_type
= builtin_type_int64
;
316 arg
= value_cast (arg_type
, arg
);
321 /* "float" arguments loaded in registers must be passed in
322 register format, aka "double". */
323 if (accumulate_size
< sizeof (arg_reg_buffer
)
324 && TYPE_LENGTH (arg_type
) == 4)
326 arg_type
= builtin_type_ieee_double_little
;
327 arg
= value_cast (arg_type
, arg
);
329 /* Tru64 5.1 has a 128-bit long double, and passes this by
330 invisible reference. No one else uses this data type. */
331 else if (TYPE_LENGTH (arg_type
) == 16)
333 /* Allocate aligned storage. */
334 sp
= (sp
& -16) - 16;
336 /* Write the real data into the stack. */
337 write_memory (sp
, VALUE_CONTENTS (arg
), 16);
339 /* Construct the indirection. */
340 arg_type
= lookup_pointer_type (arg_type
);
341 arg
= value_from_pointer (arg_type
, sp
);
345 case TYPE_CODE_COMPLEX
:
346 /* ??? The ABI says that complex values are passed as two
347 separate scalar values. This distinction only matters
348 for complex float. However, GCC does not implement this. */
350 /* Tru64 5.1 has a 128-bit long double, and passes this by
351 invisible reference. */
352 if (TYPE_LENGTH (arg_type
) == 32)
354 /* Allocate aligned storage. */
355 sp
= (sp
& -16) - 16;
357 /* Write the real data into the stack. */
358 write_memory (sp
, VALUE_CONTENTS (arg
), 32);
360 /* Construct the indirection. */
361 arg_type
= lookup_pointer_type (arg_type
);
362 arg
= value_from_pointer (arg_type
, sp
);
369 m_arg
->len
= TYPE_LENGTH (arg_type
);
370 m_arg
->offset
= accumulate_size
;
371 accumulate_size
= (accumulate_size
+ m_arg
->len
+ 7) & ~7;
372 m_arg
->contents
= VALUE_CONTENTS (arg
);
375 /* Determine required argument register loads, loading an argument register
376 is expensive as it uses three ptrace calls. */
377 required_arg_regs
= accumulate_size
/ 8;
378 if (required_arg_regs
> ALPHA_NUM_ARG_REGS
)
379 required_arg_regs
= ALPHA_NUM_ARG_REGS
;
381 /* Make room for the arguments on the stack. */
382 if (accumulate_size
< sizeof(arg_reg_buffer
))
385 accumulate_size
-= sizeof(arg_reg_buffer
);
386 sp
-= accumulate_size
;
388 /* Keep sp aligned to a multiple of 16 as the ABI requires. */
391 /* `Push' arguments on the stack. */
392 for (i
= nargs
; m_arg
--, --i
>= 0;)
394 char *contents
= m_arg
->contents
;
395 int offset
= m_arg
->offset
;
396 int len
= m_arg
->len
;
398 /* Copy the bytes destined for registers into arg_reg_buffer. */
399 if (offset
< sizeof(arg_reg_buffer
))
401 if (offset
+ len
<= sizeof(arg_reg_buffer
))
403 memcpy (arg_reg_buffer
+ offset
, contents
, len
);
408 int tlen
= sizeof(arg_reg_buffer
) - offset
;
409 memcpy (arg_reg_buffer
+ offset
, contents
, tlen
);
416 /* Everything else goes to the stack. */
417 write_memory (sp
+ offset
- sizeof(arg_reg_buffer
), contents
, len
);
420 store_unsigned_integer (arg_reg_buffer
, ALPHA_REGISTER_SIZE
, struct_addr
);
422 /* Load the argument registers. */
423 for (i
= 0; i
< required_arg_regs
; i
++)
425 regcache_cooked_write (regcache
, ALPHA_A0_REGNUM
+ i
,
426 arg_reg_buffer
+ i
*ALPHA_REGISTER_SIZE
);
427 regcache_cooked_write (regcache
, ALPHA_FPA0_REGNUM
+ i
,
428 arg_reg_buffer
+ i
*ALPHA_REGISTER_SIZE
);
431 /* Finally, update the stack pointer. */
432 regcache_cooked_write_signed (regcache
, ALPHA_SP_REGNUM
, sp
);
437 /* Extract from REGCACHE the value about to be returned from a function
438 and copy it into VALBUF. */
441 alpha_extract_return_value (struct type
*valtype
, struct regcache
*regcache
,
444 int length
= TYPE_LENGTH (valtype
);
445 char raw_buffer
[ALPHA_REGISTER_SIZE
];
448 switch (TYPE_CODE (valtype
))
454 regcache_cooked_read (regcache
, ALPHA_FP0_REGNUM
, raw_buffer
);
455 alpha_sts (valbuf
, raw_buffer
);
459 regcache_cooked_read (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
463 regcache_cooked_read_unsigned (regcache
, ALPHA_V0_REGNUM
, &l
);
464 read_memory (l
, valbuf
, 16);
468 internal_error (__FILE__
, __LINE__
, "unknown floating point width");
472 case TYPE_CODE_COMPLEX
:
476 /* ??? This isn't correct wrt the ABI, but it's what GCC does. */
477 regcache_cooked_read (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
481 regcache_cooked_read (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
482 regcache_cooked_read (regcache
, ALPHA_FP0_REGNUM
+1,
487 regcache_cooked_read_signed (regcache
, ALPHA_V0_REGNUM
, &l
);
488 read_memory (l
, valbuf
, 32);
492 internal_error (__FILE__
, __LINE__
, "unknown floating point width");
497 /* Assume everything else degenerates to an integer. */
498 regcache_cooked_read_unsigned (regcache
, ALPHA_V0_REGNUM
, &l
);
499 store_unsigned_integer (valbuf
, length
, l
);
504 /* Extract from REGCACHE the address of a structure about to be returned
508 alpha_extract_struct_value_address (struct regcache
*regcache
)
511 regcache_cooked_read_unsigned (regcache
, ALPHA_V0_REGNUM
, &addr
);
515 /* Insert the given value into REGCACHE as if it was being
516 returned by a function. */
519 alpha_store_return_value (struct type
*valtype
, struct regcache
*regcache
,
522 int length
= TYPE_LENGTH (valtype
);
523 char raw_buffer
[ALPHA_REGISTER_SIZE
];
526 switch (TYPE_CODE (valtype
))
532 alpha_lds (raw_buffer
, valbuf
);
533 regcache_cooked_write (regcache
, ALPHA_FP0_REGNUM
, raw_buffer
);
537 regcache_cooked_write (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
541 /* FIXME: 128-bit long doubles are returned like structures:
542 by writing into indirect storage provided by the caller
543 as the first argument. */
544 error ("Cannot set a 128-bit long double return value.");
547 internal_error (__FILE__
, __LINE__
, "unknown floating point width");
551 case TYPE_CODE_COMPLEX
:
555 /* ??? This isn't correct wrt the ABI, but it's what GCC does. */
556 regcache_cooked_write (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
560 regcache_cooked_write (regcache
, ALPHA_FP0_REGNUM
, valbuf
);
561 regcache_cooked_write (regcache
, ALPHA_FP0_REGNUM
+1,
562 (const char *)valbuf
+ 8);
566 /* FIXME: 128-bit long doubles are returned like structures:
567 by writing into indirect storage provided by the caller
568 as the first argument. */
569 error ("Cannot set a 128-bit long double return value.");
572 internal_error (__FILE__
, __LINE__
, "unknown floating point width");
577 /* Assume everything else degenerates to an integer. */
578 /* 32-bit values must be sign-extended to 64 bits
579 even if the base data type is unsigned. */
581 valtype
= builtin_type_int32
;
582 l
= unpack_long (valtype
, valbuf
);
583 regcache_cooked_write_unsigned (regcache
, ALPHA_V0_REGNUM
, l
);
589 static const unsigned char *
590 alpha_breakpoint_from_pc (CORE_ADDR
*pcptr
, int *lenptr
)
592 static const unsigned char alpha_breakpoint
[] =
593 { 0x80, 0, 0, 0 }; /* call_pal bpt */
595 *lenptr
= sizeof(alpha_breakpoint
);
596 return (alpha_breakpoint
);
600 /* This returns the PC of the first insn after the prologue.
601 If we can't find the prologue, then return 0. */
604 alpha_after_prologue (CORE_ADDR pc
)
606 struct symtab_and_line sal
;
607 CORE_ADDR func_addr
, func_end
;
609 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
612 sal
= find_pc_line (func_addr
, 0);
613 if (sal
.end
< func_end
)
616 /* The line after the prologue is after the end of the function. In this
617 case, tell the caller to find the prologue the hard way. */
621 /* Read an instruction from memory at PC, looking through breakpoints. */
624 alpha_read_insn (CORE_ADDR pc
)
629 status
= read_memory_nobpt (pc
, buf
, 4);
631 memory_error (status
, pc
);
632 return extract_unsigned_integer (buf
, 4);
635 /* To skip prologues, I use this predicate. Returns either PC itself
636 if the code at PC does not look like a function prologue; otherwise
637 returns an address that (if we're lucky) follows the prologue. If
638 LENIENT, then we must skip everything which is involved in setting
639 up the frame (it's OK to skip more, just so long as we don't skip
640 anything which might clobber the registers which are being saved. */
643 alpha_skip_prologue (CORE_ADDR pc
)
647 CORE_ADDR post_prologue_pc
;
650 /* Silently return the unaltered pc upon memory errors.
651 This could happen on OSF/1 if decode_line_1 tries to skip the
652 prologue for quickstarted shared library functions when the
653 shared library is not yet mapped in.
654 Reading target memory is slow over serial lines, so we perform
655 this check only if the target has shared libraries (which all
656 Alpha targets do). */
657 if (target_read_memory (pc
, buf
, 4))
660 /* See if we can determine the end of the prologue via the symbol table.
661 If so, then return either PC, or the PC after the prologue, whichever
664 post_prologue_pc
= alpha_after_prologue (pc
);
665 if (post_prologue_pc
!= 0)
666 return max (pc
, post_prologue_pc
);
668 /* Can't determine prologue from the symbol table, need to examine
671 /* Skip the typical prologue instructions. These are the stack adjustment
672 instruction and the instructions that save registers on the stack
673 or in the gcc frame. */
674 for (offset
= 0; offset
< 100; offset
+= 4)
676 inst
= alpha_read_insn (pc
+ offset
);
678 if ((inst
& 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
680 if ((inst
& 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
682 if ((inst
& 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
684 if ((inst
& 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
687 if (((inst
& 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
688 || (inst
& 0xfc1f0000) == 0x9c1e0000) /* stt reg,n($sp) */
689 && (inst
& 0x03e00000) != 0x03e00000) /* reg != $zero */
692 if (inst
== 0x47de040f) /* bis sp,sp,fp */
694 if (inst
== 0x47fe040f) /* bis zero,sp,fp */
703 /* Figure out where the longjmp will land.
704 We expect the first arg to be a pointer to the jmp_buf structure from
705 which we extract the PC (JB_PC) that we will land at. The PC is copied
706 into the "pc". This routine returns true on success. */
709 alpha_get_longjmp_target (CORE_ADDR
*pc
)
711 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
713 char raw_buffer
[ALPHA_REGISTER_SIZE
];
715 jb_addr
= read_register (ALPHA_A0_REGNUM
);
717 if (target_read_memory (jb_addr
+ (tdep
->jb_pc
* tdep
->jb_elt_size
),
718 raw_buffer
, tdep
->jb_elt_size
))
721 *pc
= extract_unsigned_integer (raw_buffer
, tdep
->jb_elt_size
);
726 /* Frame unwinder for signal trampolines. We use alpha tdep bits that
727 describe the location and shape of the sigcontext structure. After
728 that, all registers are in memory, so it's easy. */
729 /* ??? Shouldn't we be able to do this generically, rather than with
730 OSABI data specific to Alpha? */
732 struct alpha_sigtramp_unwind_cache
734 CORE_ADDR sigcontext_addr
;
737 static struct alpha_sigtramp_unwind_cache
*
738 alpha_sigtramp_frame_unwind_cache (struct frame_info
*next_frame
,
739 void **this_prologue_cache
)
741 struct alpha_sigtramp_unwind_cache
*info
;
742 struct gdbarch_tdep
*tdep
;
744 if (*this_prologue_cache
)
745 return *this_prologue_cache
;
747 info
= FRAME_OBSTACK_ZALLOC (struct alpha_sigtramp_unwind_cache
);
748 *this_prologue_cache
= info
;
750 tdep
= gdbarch_tdep (current_gdbarch
);
751 info
->sigcontext_addr
= tdep
->sigcontext_addr (next_frame
);
756 /* Return the address of REGNO in a sigtramp frame. Since this is all
757 arithmetic, it doesn't seem worthwhile to cache it. */
759 #ifndef SIGFRAME_PC_OFF
760 #define SIGFRAME_PC_OFF (2 * 8)
761 #define SIGFRAME_REGSAVE_OFF (4 * 8)
762 #define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
766 alpha_sigtramp_register_address (CORE_ADDR sigcontext_addr
, unsigned int regno
)
769 return sigcontext_addr
+ SIGFRAME_REGSAVE_OFF
+ regno
* 8;
770 if (regno
>= ALPHA_FP0_REGNUM
&& regno
< ALPHA_FP0_REGNUM
+ 32)
771 return sigcontext_addr
+ SIGFRAME_FPREGSAVE_OFF
+ regno
* 8;
772 if (regno
== ALPHA_PC_REGNUM
)
773 return sigcontext_addr
+ SIGFRAME_PC_OFF
;
778 /* Given a GDB frame, determine the address of the calling function's
779 frame. This will be used to create a new GDB frame struct. */
782 alpha_sigtramp_frame_this_id (struct frame_info
*next_frame
,
783 void **this_prologue_cache
,
784 struct frame_id
*this_id
)
786 struct alpha_sigtramp_unwind_cache
*info
787 = alpha_sigtramp_frame_unwind_cache (next_frame
, this_prologue_cache
);
788 struct gdbarch_tdep
*tdep
;
789 CORE_ADDR stack_addr
, code_addr
;
791 /* If the OSABI couldn't locate the sigcontext, give up. */
792 if (info
->sigcontext_addr
== 0)
795 /* If we have dynamic signal trampolines, find their start.
796 If we do not, then we must assume there is a symbol record
797 that can provide the start address. */
798 tdep
= gdbarch_tdep (current_gdbarch
);
799 if (tdep
->dynamic_sigtramp_offset
)
802 code_addr
= frame_pc_unwind (next_frame
);
803 offset
= tdep
->dynamic_sigtramp_offset (code_addr
);
810 code_addr
= frame_func_unwind (next_frame
);
812 /* The stack address is trivially read from the sigcontext. */
813 stack_addr
= alpha_sigtramp_register_address (info
->sigcontext_addr
,
815 stack_addr
= get_frame_memory_unsigned (next_frame
, stack_addr
,
816 ALPHA_REGISTER_SIZE
);
818 *this_id
= frame_id_build (stack_addr
, code_addr
);
821 /* Retrieve the value of REGNUM in FRAME. Don't give up! */
824 alpha_sigtramp_frame_prev_register (struct frame_info
*next_frame
,
825 void **this_prologue_cache
,
826 int regnum
, int *optimizedp
,
827 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
828 int *realnump
, void *bufferp
)
830 struct alpha_sigtramp_unwind_cache
*info
831 = alpha_sigtramp_frame_unwind_cache (next_frame
, this_prologue_cache
);
834 if (info
->sigcontext_addr
!= 0)
836 /* All integer and fp registers are stored in memory. */
837 addr
= alpha_sigtramp_register_address (info
->sigcontext_addr
, regnum
);
841 *lvalp
= lval_memory
;
845 get_frame_memory (next_frame
, addr
, bufferp
, ALPHA_REGISTER_SIZE
);
850 /* This extra register may actually be in the sigcontext, but our
851 current description of it in alpha_sigtramp_frame_unwind_cache
852 doesn't include it. Too bad. Fall back on whatever's in the
854 frame_register (next_frame
, regnum
, optimizedp
, lvalp
, addrp
,
858 static const struct frame_unwind alpha_sigtramp_frame_unwind
= {
860 alpha_sigtramp_frame_this_id
,
861 alpha_sigtramp_frame_prev_register
864 static const struct frame_unwind
*
865 alpha_sigtramp_frame_p (CORE_ADDR pc
)
869 /* We shouldn't even bother to try if the OSABI didn't register
870 a sigcontext_addr handler. */
871 if (!gdbarch_tdep (current_gdbarch
)->sigcontext_addr
)
874 /* Otherwise we should be in a signal frame. */
875 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
876 if (PC_IN_SIGTRAMP (pc
, name
))
877 return &alpha_sigtramp_frame_unwind
;
882 /* Fallback alpha frame unwinder. Uses instruction scanning and knows
883 something about the traditional layout of alpha stack frames. */
885 struct alpha_heuristic_unwind_cache
887 CORE_ADDR
*saved_regs
;
893 /* Heuristic_proc_start may hunt through the text section for a long
894 time across a 2400 baud serial line. Allows the user to limit this
896 static unsigned int heuristic_fence_post
= 0;
898 /* Attempt to locate the start of the function containing PC. We assume that
899 the previous function ends with an about_to_return insn. Not foolproof by
900 any means, since gcc is happy to put the epilogue in the middle of a
901 function. But we're guessing anyway... */
904 alpha_heuristic_proc_start (CORE_ADDR pc
)
906 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
907 CORE_ADDR last_non_nop
= pc
;
908 CORE_ADDR fence
= pc
- heuristic_fence_post
;
909 CORE_ADDR orig_pc
= pc
;
915 /* First see if we can find the start of the function from minimal
916 symbol information. This can succeed with a binary that doesn't
917 have debug info, but hasn't been stripped. */
918 func
= get_pc_function_start (pc
);
922 if (heuristic_fence_post
== UINT_MAX
923 || fence
< tdep
->vm_min_address
)
924 fence
= tdep
->vm_min_address
;
926 /* Search back for previous return; also stop at a 0, which might be
927 seen for instance before the start of a code section. Don't include
928 nops, since this usually indicates padding between functions. */
929 for (pc
-= 4; pc
>= fence
; pc
-= 4)
931 unsigned int insn
= alpha_read_insn (pc
);
934 case 0: /* invalid insn */
935 case 0x6bfa8001: /* ret $31,($26),1 */
938 case 0x2ffe0000: /* unop: ldq_u $31,0($30) */
939 case 0x47ff041f: /* nop: bis $31,$31,$31 */
948 /* It's not clear to me why we reach this point when stopping quietly,
949 but with this test, at least we don't print out warnings for every
950 child forked (eg, on decstation). 22apr93 rich@cygnus.com. */
951 if (stop_soon
== NO_STOP_QUIETLY
)
953 static int blurb_printed
= 0;
955 if (fence
== tdep
->vm_min_address
)
956 warning ("Hit beginning of text section without finding");
958 warning ("Hit heuristic-fence-post without finding");
959 warning ("enclosing function for address 0x%s", paddr_nz (orig_pc
));
964 This warning occurs if you are debugging a function without any symbols\n\
965 (for example, in a stripped executable). In that case, you may wish to\n\
966 increase the size of the search with the `set heuristic-fence-post' command.\n\
968 Otherwise, you told GDB there was a function where there isn't one, or\n\
969 (more likely) you have encountered a bug in GDB.\n");
977 static struct alpha_heuristic_unwind_cache
*
978 alpha_heuristic_frame_unwind_cache (struct frame_info
*next_frame
,
979 void **this_prologue_cache
,
982 struct alpha_heuristic_unwind_cache
*info
;
984 CORE_ADDR limit_pc
, cur_pc
;
985 int frame_reg
, frame_size
, return_reg
, reg
;
987 if (*this_prologue_cache
)
988 return *this_prologue_cache
;
990 info
= FRAME_OBSTACK_ZALLOC (struct alpha_heuristic_unwind_cache
);
991 *this_prologue_cache
= info
;
992 info
->saved_regs
= frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
994 limit_pc
= frame_pc_unwind (next_frame
);
996 start_pc
= alpha_heuristic_proc_start (limit_pc
);
997 info
->start_pc
= start_pc
;
999 frame_reg
= ALPHA_SP_REGNUM
;
1003 /* If we've identified a likely place to start, do code scanning. */
1006 /* Limit the forward search to 50 instructions. */
1007 if (start_pc
+ 200 < limit_pc
)
1008 limit_pc
= start_pc
+ 200;
1010 for (cur_pc
= start_pc
; cur_pc
< limit_pc
; cur_pc
+= 4)
1012 unsigned int word
= alpha_read_insn (cur_pc
);
1014 if ((word
& 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
1018 /* Consider only the first stack allocation instruction
1019 to contain the static size of the frame. */
1020 if (frame_size
== 0)
1021 frame_size
= (-word
) & 0xffff;
1025 /* Exit loop if a positive stack adjustment is found, which
1026 usually means that the stack cleanup code in the function
1027 epilogue is reached. */
1031 else if ((word
& 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */
1033 reg
= (word
& 0x03e00000) >> 21;
1038 /* Do not compute the address where the register was saved yet,
1039 because we don't know yet if the offset will need to be
1040 relative to $sp or $fp (we can not compute the address
1041 relative to $sp if $sp is updated during the execution of
1042 the current subroutine, for instance when doing some alloca).
1043 So just store the offset for the moment, and compute the
1044 address later when we know whether this frame has a frame
1046 /* Hack: temporarily add one, so that the offset is non-zero
1047 and we can tell which registers have save offsets below. */
1048 info
->saved_regs
[reg
] = (word
& 0xffff) + 1;
1050 /* Starting with OSF/1-3.2C, the system libraries are shipped
1051 without local symbols, but they still contain procedure
1052 descriptors without a symbol reference. GDB is currently
1053 unable to find these procedure descriptors and uses
1054 heuristic_proc_desc instead.
1055 As some low level compiler support routines (__div*, __add*)
1056 use a non-standard return address register, we have to
1057 add some heuristics to determine the return address register,
1058 or stepping over these routines will fail.
1059 Usually the return address register is the first register
1060 saved on the stack, but assembler optimization might
1061 rearrange the register saves.
1062 So we recognize only a few registers (t7, t9, ra) within
1063 the procedure prologue as valid return address registers.
1064 If we encounter a return instruction, we extract the
1065 the return address register from it.
1067 FIXME: Rewriting GDB to access the procedure descriptors,
1068 e.g. via the minimal symbol table, might obviate this hack. */
1069 if (return_reg
== -1
1070 && cur_pc
< (start_pc
+ 80)
1071 && (reg
== ALPHA_T7_REGNUM
1072 || reg
== ALPHA_T9_REGNUM
1073 || reg
== ALPHA_RA_REGNUM
))
1076 else if ((word
& 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
1077 return_reg
= (word
>> 16) & 0x1f;
1078 else if (word
== 0x47de040f) /* bis sp,sp,fp */
1079 frame_reg
= ALPHA_GCC_FP_REGNUM
;
1080 else if (word
== 0x47fe040f) /* bis zero,sp,fp */
1081 frame_reg
= ALPHA_GCC_FP_REGNUM
;
1084 /* If we haven't found a valid return address register yet, keep
1085 searching in the procedure prologue. */
1086 if (return_reg
== -1)
1088 while (cur_pc
< (limit_pc
+ 80) && cur_pc
< (start_pc
+ 80))
1090 unsigned int word
= alpha_read_insn (cur_pc
);
1092 if ((word
& 0xfc1f0000) == 0xb41e0000) /* stq reg,n($sp) */
1094 reg
= (word
& 0x03e00000) >> 21;
1095 if (reg
== ALPHA_T7_REGNUM
1096 || reg
== ALPHA_T9_REGNUM
1097 || reg
== ALPHA_RA_REGNUM
)
1103 else if ((word
& 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
1105 return_reg
= (word
>> 16) & 0x1f;
1114 /* Failing that, do default to the customary RA. */
1115 if (return_reg
== -1)
1116 return_reg
= ALPHA_RA_REGNUM
;
1117 info
->return_reg
= return_reg
;
1119 frame_unwind_unsigned_register (next_frame
, frame_reg
, &val
);
1120 info
->vfp
= val
+ frame_size
;
1122 /* Convert offsets to absolute addresses. See above about adding
1123 one to the offsets to make all detected offsets non-zero. */
1124 for (reg
= 0; reg
< ALPHA_NUM_REGS
; ++reg
)
1125 if (info
->saved_regs
[reg
])
1126 info
->saved_regs
[reg
] += val
- 1;
1131 /* Given a GDB frame, determine the address of the calling function's
1132 frame. This will be used to create a new GDB frame struct. */
1135 alpha_heuristic_frame_this_id (struct frame_info
*next_frame
,
1136 void **this_prologue_cache
,
1137 struct frame_id
*this_id
)
1139 struct alpha_heuristic_unwind_cache
*info
1140 = alpha_heuristic_frame_unwind_cache (next_frame
, this_prologue_cache
, 0);
1142 /* This is meant to halt the backtrace at "_start". Make sure we
1143 don't halt it at a generic dummy frame. */
1144 if (inside_entry_file (info
->start_pc
))
1147 *this_id
= frame_id_build (info
->vfp
, info
->start_pc
);
1150 /* Retrieve the value of REGNUM in FRAME. Don't give up! */
1153 alpha_heuristic_frame_prev_register (struct frame_info
*next_frame
,
1154 void **this_prologue_cache
,
1155 int regnum
, int *optimizedp
,
1156 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
1157 int *realnump
, void *bufferp
)
1159 struct alpha_heuristic_unwind_cache
*info
1160 = alpha_heuristic_frame_unwind_cache (next_frame
, this_prologue_cache
, 0);
1162 /* The PC of the previous frame is stored in the link register of
1163 the current frame. Frob regnum so that we pull the value from
1164 the correct place. */
1165 if (regnum
== ALPHA_PC_REGNUM
)
1166 regnum
= info
->return_reg
;
1168 /* For all registers known to be saved in the current frame,
1169 do the obvious and pull the value out. */
1170 if (info
->saved_regs
[regnum
])
1173 *lvalp
= lval_memory
;
1174 *addrp
= info
->saved_regs
[regnum
];
1176 if (bufferp
!= NULL
)
1177 get_frame_memory (next_frame
, *addrp
, bufferp
, ALPHA_REGISTER_SIZE
);
1181 /* The stack pointer of the previous frame is computed by popping
1182 the current stack frame. */
1183 if (regnum
== ALPHA_SP_REGNUM
)
1189 if (bufferp
!= NULL
)
1190 store_unsigned_integer (bufferp
, ALPHA_REGISTER_SIZE
, info
->vfp
);
1194 /* Otherwise assume the next frame has the same register value. */
1195 frame_register (next_frame
, regnum
, optimizedp
, lvalp
, addrp
,
1199 static const struct frame_unwind alpha_heuristic_frame_unwind
= {
1201 alpha_heuristic_frame_this_id
,
1202 alpha_heuristic_frame_prev_register
1205 static const struct frame_unwind
*
1206 alpha_heuristic_frame_p (CORE_ADDR pc
)
1208 return &alpha_heuristic_frame_unwind
;
1212 alpha_heuristic_frame_base_address (struct frame_info
*next_frame
,
1213 void **this_prologue_cache
)
1215 struct alpha_heuristic_unwind_cache
*info
1216 = alpha_heuristic_frame_unwind_cache (next_frame
, this_prologue_cache
, 0);
1221 static const struct frame_base alpha_heuristic_frame_base
= {
1222 &alpha_heuristic_frame_unwind
,
1223 alpha_heuristic_frame_base_address
,
1224 alpha_heuristic_frame_base_address
,
1225 alpha_heuristic_frame_base_address
1228 /* Just like reinit_frame_cache, but with the right arguments to be
1229 callable as an sfunc. Used by the "set heuristic-fence-post" command. */
1232 reinit_frame_cache_sfunc (char *args
, int from_tty
, struct cmd_list_element
*c
)
1234 reinit_frame_cache ();
1238 /* ALPHA stack frames are almost impenetrable. When execution stops,
1239 we basically have to look at symbol information for the function
1240 that we stopped in, which tells us *which* register (if any) is
1241 the base of the frame pointer, and what offset from that register
1242 the frame itself is at.
1244 This presents a problem when trying to examine a stack in memory
1245 (that isn't executing at the moment), using the "frame" command. We
1246 don't have a PC, nor do we have any registers except SP.
1248 This routine takes two arguments, SP and PC, and tries to make the
1249 cached frames look as if these two arguments defined a frame on the
1250 cache. This allows the rest of info frame to extract the important
1251 arguments without difficulty. */
1254 alpha_setup_arbitrary_frame (int argc
, CORE_ADDR
*argv
)
1257 error ("ALPHA frame specifications require two arguments: sp and pc");
1259 return create_new_frame (argv
[0], argv
[1]);
1262 /* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
1263 dummy frame. The frame ID's base needs to match the TOS value
1264 saved by save_dummy_frame_tos(), and the PC match the dummy frame's
1267 static struct frame_id
1268 alpha_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1271 frame_unwind_unsigned_register (next_frame
, ALPHA_SP_REGNUM
, &base
);
1272 return frame_id_build (base
, frame_pc_unwind (next_frame
));
1276 alpha_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1279 frame_unwind_unsigned_register (next_frame
, ALPHA_PC_REGNUM
, &pc
);
1284 /* Helper routines for alpha*-nat.c files to move register sets to and
1285 from core files. The UNIQUE pointer is allowed to be NULL, as most
1286 targets don't supply this value in their core files. */
1289 alpha_supply_int_regs (int regno
, const void *r0_r30
,
1290 const void *pc
, const void *unique
)
1294 for (i
= 0; i
< 31; ++i
)
1295 if (regno
== i
|| regno
== -1)
1296 supply_register (i
, (const char *)r0_r30
+ i
*8);
1298 if (regno
== ALPHA_ZERO_REGNUM
|| regno
== -1)
1299 supply_register (ALPHA_ZERO_REGNUM
, NULL
);
1301 if (regno
== ALPHA_PC_REGNUM
|| regno
== -1)
1302 supply_register (ALPHA_PC_REGNUM
, pc
);
1304 if (regno
== ALPHA_UNIQUE_REGNUM
|| regno
== -1)
1305 supply_register (ALPHA_UNIQUE_REGNUM
, unique
);
1309 alpha_fill_int_regs (int regno
, void *r0_r30
, void *pc
, void *unique
)
1313 for (i
= 0; i
< 31; ++i
)
1314 if (regno
== i
|| regno
== -1)
1315 regcache_collect (i
, (char *)r0_r30
+ i
*8);
1317 if (regno
== ALPHA_PC_REGNUM
|| regno
== -1)
1318 regcache_collect (ALPHA_PC_REGNUM
, pc
);
1320 if (unique
&& (regno
== ALPHA_UNIQUE_REGNUM
|| regno
== -1))
1321 regcache_collect (ALPHA_UNIQUE_REGNUM
, unique
);
1325 alpha_supply_fp_regs (int regno
, const void *f0_f30
, const void *fpcr
)
1329 for (i
= ALPHA_FP0_REGNUM
; i
< ALPHA_FP0_REGNUM
+ 31; ++i
)
1330 if (regno
== i
|| regno
== -1)
1331 supply_register (i
, (const char *)f0_f30
+ (i
- ALPHA_FP0_REGNUM
) * 8);
1333 if (regno
== ALPHA_FPCR_REGNUM
|| regno
== -1)
1334 supply_register (ALPHA_FPCR_REGNUM
, fpcr
);
1338 alpha_fill_fp_regs (int regno
, void *f0_f30
, void *fpcr
)
1342 for (i
= ALPHA_FP0_REGNUM
; i
< ALPHA_FP0_REGNUM
+ 31; ++i
)
1343 if (regno
== i
|| regno
== -1)
1344 regcache_collect (i
, (char *)f0_f30
+ (i
- ALPHA_FP0_REGNUM
) * 8);
1346 if (regno
== ALPHA_FPCR_REGNUM
|| regno
== -1)
1347 regcache_collect (ALPHA_FPCR_REGNUM
, fpcr
);
1351 /* alpha_software_single_step() is called just before we want to resume
1352 the inferior, if we want to single-step it but there is no hardware
1353 or kernel single-step support (NetBSD on Alpha, for example). We find
1354 the target of the coming instruction and breakpoint it.
1356 single_step is also called just after the inferior stops. If we had
1357 set up a simulated single-step, we undo our damage. */
1360 alpha_next_pc (CORE_ADDR pc
)
1367 insn
= alpha_read_insn (pc
);
1369 /* Opcode is top 6 bits. */
1370 op
= (insn
>> 26) & 0x3f;
1374 /* Jump format: target PC is:
1376 return (read_register ((insn
>> 16) & 0x1f) & ~3);
1379 if ((op
& 0x30) == 0x30)
1381 /* Branch format: target PC is:
1382 (new PC) + (4 * sext(displacement)) */
1383 if (op
== 0x30 || /* BR */
1384 op
== 0x34) /* BSR */
1387 offset
= (insn
& 0x001fffff);
1388 if (offset
& 0x00100000)
1389 offset
|= 0xffe00000;
1391 return (pc
+ 4 + offset
);
1394 /* Need to determine if branch is taken; read RA. */
1395 rav
= (LONGEST
) read_register ((insn
>> 21) & 0x1f);
1398 case 0x38: /* BLBC */
1402 case 0x3c: /* BLBS */
1406 case 0x39: /* BEQ */
1410 case 0x3d: /* BNE */
1414 case 0x3a: /* BLT */
1418 case 0x3b: /* BLE */
1422 case 0x3f: /* BGT */
1426 case 0x3e: /* BGE */
1431 /* ??? Missing floating-point branches. */
1435 /* Not a branch or branch not taken; target PC is:
1441 alpha_software_single_step (enum target_signal sig
, int insert_breakpoints_p
)
1443 static CORE_ADDR next_pc
;
1444 typedef char binsn_quantum
[BREAKPOINT_MAX
];
1445 static binsn_quantum break_mem
;
1448 if (insert_breakpoints_p
)
1451 next_pc
= alpha_next_pc (pc
);
1453 target_insert_breakpoint (next_pc
, break_mem
);
1457 target_remove_breakpoint (next_pc
, break_mem
);
1463 /* Initialize the current architecture based on INFO. If possible, re-use an
1464 architecture from ARCHES, which is a list of architectures already created
1465 during this debugging session.
1467 Called e.g. at program startup, when reading a core file, and when reading
1470 static struct gdbarch
*
1471 alpha_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1473 struct gdbarch_tdep
*tdep
;
1474 struct gdbarch
*gdbarch
;
1476 /* Try to determine the ABI of the object we are loading. */
1477 if (info
.abfd
!= NULL
&& info
.osabi
== GDB_OSABI_UNKNOWN
)
1479 /* If it's an ECOFF file, assume it's OSF/1. */
1480 if (bfd_get_flavour (info
.abfd
) == bfd_target_ecoff_flavour
)
1481 info
.osabi
= GDB_OSABI_OSF1
;
1484 /* Find a candidate among extant architectures. */
1485 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
1487 return arches
->gdbarch
;
1489 tdep
= xmalloc (sizeof (struct gdbarch_tdep
));
1490 gdbarch
= gdbarch_alloc (&info
, tdep
);
1492 /* Lowest text address. This is used by heuristic_proc_start()
1493 to decide when to stop looking. */
1494 tdep
->vm_min_address
= (CORE_ADDR
) 0x120000000;
1496 tdep
->dynamic_sigtramp_offset
= NULL
;
1497 tdep
->sigcontext_addr
= NULL
;
1499 tdep
->jb_pc
= -1; /* longjmp support not enabled by default */
1502 set_gdbarch_short_bit (gdbarch
, 16);
1503 set_gdbarch_int_bit (gdbarch
, 32);
1504 set_gdbarch_long_bit (gdbarch
, 64);
1505 set_gdbarch_long_long_bit (gdbarch
, 64);
1506 set_gdbarch_float_bit (gdbarch
, 32);
1507 set_gdbarch_double_bit (gdbarch
, 64);
1508 set_gdbarch_long_double_bit (gdbarch
, 64);
1509 set_gdbarch_ptr_bit (gdbarch
, 64);
1512 set_gdbarch_num_regs (gdbarch
, ALPHA_NUM_REGS
);
1513 set_gdbarch_sp_regnum (gdbarch
, ALPHA_SP_REGNUM
);
1514 set_gdbarch_pc_regnum (gdbarch
, ALPHA_PC_REGNUM
);
1515 set_gdbarch_fp0_regnum (gdbarch
, ALPHA_FP0_REGNUM
);
1517 set_gdbarch_register_name (gdbarch
, alpha_register_name
);
1518 set_gdbarch_deprecated_register_byte (gdbarch
, alpha_register_byte
);
1519 set_gdbarch_deprecated_register_raw_size (gdbarch
, alpha_register_raw_size
);
1520 set_gdbarch_deprecated_register_virtual_size (gdbarch
, alpha_register_virtual_size
);
1521 set_gdbarch_register_type (gdbarch
, alpha_register_type
);
1523 set_gdbarch_cannot_fetch_register (gdbarch
, alpha_cannot_fetch_register
);
1524 set_gdbarch_cannot_store_register (gdbarch
, alpha_cannot_store_register
);
1526 set_gdbarch_convert_register_p (gdbarch
, alpha_convert_register_p
);
1527 set_gdbarch_register_to_value (gdbarch
, alpha_register_to_value
);
1528 set_gdbarch_value_to_register (gdbarch
, alpha_value_to_register
);
1530 set_gdbarch_register_reggroup_p (gdbarch
, alpha_register_reggroup_p
);
1532 /* Prologue heuristics. */
1533 set_gdbarch_skip_prologue (gdbarch
, alpha_skip_prologue
);
1536 set_gdbarch_print_insn (gdbarch
, print_insn_alpha
);
1539 set_gdbarch_frameless_function_invocation (gdbarch
,
1540 generic_frameless_function_invocation_not
);
1542 set_gdbarch_use_struct_convention (gdbarch
, always_use_struct_convention
);
1543 set_gdbarch_extract_return_value (gdbarch
, alpha_extract_return_value
);
1544 set_gdbarch_store_return_value (gdbarch
, alpha_store_return_value
);
1545 set_gdbarch_extract_struct_value_address (gdbarch
,
1546 alpha_extract_struct_value_address
);
1548 /* Settings for calling functions in the inferior. */
1549 set_gdbarch_push_dummy_call (gdbarch
, alpha_push_dummy_call
);
1551 /* Methods for saving / extracting a dummy frame's ID. */
1552 set_gdbarch_unwind_dummy_id (gdbarch
, alpha_unwind_dummy_id
);
1554 /* Return the unwound PC value. */
1555 set_gdbarch_unwind_pc (gdbarch
, alpha_unwind_pc
);
1557 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1558 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
1560 set_gdbarch_breakpoint_from_pc (gdbarch
, alpha_breakpoint_from_pc
);
1561 set_gdbarch_decr_pc_after_break (gdbarch
, 4);
1563 set_gdbarch_function_start_offset (gdbarch
, 0);
1564 set_gdbarch_frame_args_skip (gdbarch
, 0);
1566 /* Hook in ABI-specific overrides, if they have been registered. */
1567 gdbarch_init_osabi (info
, gdbarch
);
1569 /* Now that we have tuned the configuration, set a few final things
1570 based on what the OS ABI has told us. */
1572 if (tdep
->jb_pc
>= 0)
1573 set_gdbarch_get_longjmp_target (gdbarch
, alpha_get_longjmp_target
);
1575 frame_unwind_append_predicate (gdbarch
, alpha_sigtramp_frame_p
);
1576 frame_unwind_append_predicate (gdbarch
, alpha_heuristic_frame_p
);
1578 frame_base_set_default (gdbarch
, &alpha_heuristic_frame_base
);
1584 alpha_dwarf2_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
1586 frame_unwind_append_predicate (gdbarch
, dwarf2_frame_p
);
1587 frame_base_append_predicate (gdbarch
, dwarf2_frame_base_p
);
1588 set_gdbarch_dwarf2_build_frame_info (gdbarch
, dwarf2_build_frame_info
);
1591 extern initialize_file_ftype _initialize_alpha_tdep
; /* -Wmissing-prototypes */
1594 _initialize_alpha_tdep (void)
1596 struct cmd_list_element
*c
;
1598 gdbarch_register (bfd_arch_alpha
, alpha_gdbarch_init
, NULL
);
1600 /* Let the user set the fence post for heuristic_proc_start. */
1602 /* We really would like to have both "0" and "unlimited" work, but
1603 command.c doesn't deal with that. So make it a var_zinteger
1604 because the user can always use "999999" or some such for unlimited. */
1605 c
= add_set_cmd ("heuristic-fence-post", class_support
, var_zinteger
,
1606 (char *) &heuristic_fence_post
,
1608 Set the distance searched for the start of a function.\n\
1609 If you are debugging a stripped executable, GDB needs to search through the\n\
1610 program for the start of a function. This command sets the distance of the\n\
1611 search. The only need to set it is when debugging a stripped executable.",
1613 /* We need to throw away the frame cache when we set this, since it
1614 might change our ability to get backtraces. */
1615 set_cmd_sfunc (c
, reinit_frame_cache_sfunc
);
1616 add_show_from_set (c
, &showlist
);