1 /* Definitions to make GDB run on an Alpha box under OSF1. This is
2 also used by the Alpha/Netware and Alpha/Linux targets.
3 Copyright 1993, 1994, 1995, 1996 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, Boston, MA 02111-1307, USA. */
25 #include "coff/sym.h" /* Needed for PDR below. */
26 #include "coff/symconst.h"
35 #if !defined (TARGET_BYTE_ORDER)
36 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
39 /* Redefine some target bit sizes from the default. */
41 #define TARGET_LONG_BIT 64
42 #define TARGET_LONG_LONG_BIT 64
43 #define TARGET_PTR_BIT 64
45 /* Floating point is IEEE compliant */
48 /* Number of traps that happen between exec'ing the shell
49 * to run an inferior, and when we finally get to
50 * the inferior code. This is 2 on most implementations.
52 #define START_INFERIOR_TRAPS_EXPECTED 3
54 /* Offset from address of function to start of its code.
55 Zero on most machines. */
57 #define FUNCTION_START_OFFSET 0
59 /* Advance PC across any function entry prologue instructions
60 to reach some "real" code. */
62 #define SKIP_PROLOGUE(pc) pc = alpha_skip_prologue(pc, 0)
63 extern CORE_ADDR alpha_skip_prologue
PARAMS ((CORE_ADDR addr
, int lenient
));
65 /* Immediately after a function call, return the saved pc.
66 Can't always go through the frames for this because on some machines
67 the new frame is not set up until the new function executes
70 #define SAVED_PC_AFTER_CALL(frame) alpha_saved_pc_after_call(frame)
72 alpha_saved_pc_after_call
PARAMS ((struct frame_info
*));
74 /* Are we currently handling a signal ? */
76 #define IN_SIGTRAMP(pc, name) ((name) && STREQ ("__sigtramp", (name)))
78 /* Stack grows downward. */
80 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
82 #define BREAKPOINT {0x80, 0, 0, 0} /* call_pal bpt */
84 /* Amount PC must be decremented by after a breakpoint.
85 This is often the number of bytes in BREAKPOINT
88 #ifndef DECR_PC_AFTER_BREAK
89 #define DECR_PC_AFTER_BREAK 4
92 /* Say how long (ordinary) registers are. This is a piece of bogosity
93 used in push_word and a few other places; REGISTER_RAW_SIZE is the
94 real way to know how big a register is. */
96 #define REGISTER_SIZE 8
98 /* Number of machine registers */
102 /* Initializer for an array of names of registers.
103 There should be NUM_REGS strings in this initializer. */
105 #define REGISTER_NAMES \
106 { "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", \
107 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", \
108 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", \
109 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", \
110 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
111 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
112 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
113 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "fpcr",\
117 /* Register numbers of various important registers.
118 Note that most of these values are "real" register numbers,
119 and correspond to the general registers of the machine,
120 and FP_REGNUM is a "phony" register number which is too large
121 to be an actual register number as far as the user is concerned
122 but serves to get the desired value when passed to read_register. */
124 #define V0_REGNUM 0 /* Function integer return value */
125 #define T7_REGNUM 8 /* Return address register for OSF/1 __add* */
126 #define GCC_FP_REGNUM 15 /* Used by gcc as frame register */
127 #define A0_REGNUM 16 /* Loc of first arg during a subr call */
128 #define T9_REGNUM 23 /* Return address register for OSF/1 __div* */
129 #define T12_REGNUM 27 /* Contains start addr of current proc */
130 #define SP_REGNUM 30 /* Contains address of top of stack */
131 #define RA_REGNUM 26 /* Contains return address value */
132 #define ZERO_REGNUM 31 /* Read-only register, always 0 */
133 #define FP0_REGNUM 32 /* Floating point register 0 */
134 #define FPA0_REGNUM 48 /* First float arg during a subr call */
135 #define FPCR_REGNUM 63 /* Floating point control register */
136 #define PC_REGNUM 64 /* Contains program counter */
137 #define FP_REGNUM 65 /* Virtual frame pointer */
139 #define CANNOT_FETCH_REGISTER(regno) \
140 ((regno) == FP_REGNUM || (regno) == ZERO_REGNUM)
141 #define CANNOT_STORE_REGISTER(regno) \
142 ((regno) == FP_REGNUM || (regno) == ZERO_REGNUM)
144 /* Total amount of space needed to store our copies of the machine's
145 register state, the array `registers'. */
146 #define REGISTER_BYTES (NUM_REGS * 8)
148 /* Index within `registers' of the first byte of the space for
151 #define REGISTER_BYTE(N) ((N) * 8)
153 /* Number of bytes of storage in the actual machine representation
154 for register N. On Alphas, all regs are 8 bytes. */
156 #define REGISTER_RAW_SIZE(N) 8
158 /* Number of bytes of storage in the program's representation
159 for register N. On Alphas, all regs are 8 bytes. */
161 #define REGISTER_VIRTUAL_SIZE(N) 8
163 /* Largest value REGISTER_RAW_SIZE can have. */
165 #define MAX_REGISTER_RAW_SIZE 8
167 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
169 #define MAX_REGISTER_VIRTUAL_SIZE 8
171 /* Nonzero if register N requires conversion
172 from raw format to virtual format.
173 The alpha needs a conversion between register and memory format if
174 the register is a floating point register and
175 memory format is float, as the register format must be double
177 memory format is an integer with 4 bytes or less, as the representation
178 of integers in floating point registers is different. */
180 #define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM && (N) < FP0_REGNUM + 31)
182 /* Convert data from raw format for register REGNUM in buffer FROM
183 to virtual format with type TYPE in buffer TO. */
185 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM, TYPE, FROM, TO) \
186 alpha_register_convert_to_virtual (REGNUM, TYPE, FROM, TO)
188 alpha_register_convert_to_virtual
PARAMS ((int, struct type
*, char *, char *));
190 /* Convert data from virtual format with type TYPE in buffer FROM
191 to raw format for register REGNUM in buffer TO. */
193 #define REGISTER_CONVERT_TO_RAW(TYPE, REGNUM, FROM, TO) \
194 alpha_register_convert_to_raw (TYPE, REGNUM, FROM, TO)
196 alpha_register_convert_to_raw
PARAMS ((struct type
*, int, char *, char *));
198 /* Return the GDB type object for the "standard" data type
199 of data in register N. */
201 #define REGISTER_VIRTUAL_TYPE(N) \
202 (((N) >= FP0_REGNUM && (N) < FP0_REGNUM+31) \
203 ? builtin_type_double : builtin_type_long) \
205 /* Store the address of the place in which to copy the structure the
206 subroutine will return. Handled by alpha_push_arguments. */
208 #define STORE_STRUCT_RETURN(addr, sp) /**/
210 /* Extract from an array REGBUF containing the (raw) register state
211 a function return value of type TYPE, and copy that, in virtual format,
214 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
215 alpha_extract_return_value(TYPE, REGBUF, VALBUF)
217 alpha_extract_return_value
PARAMS ((struct type
*, char *, char *));
219 /* Write into appropriate registers a function return value
220 of type TYPE, given in virtual format. */
222 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
223 alpha_store_return_value(TYPE, VALBUF)
225 alpha_store_return_value
PARAMS ((struct type
*, char *));
227 /* Extract from an array REGBUF containing the (raw) register state
228 the address in which a function should return its structure value,
229 as a CORE_ADDR (or an expression that can be used as one). */
230 /* The address is passed in a0 upon entry to the function, but when
231 the function exits, the compiler has copied the value to v0. This
232 convention is specified by the System V ABI, so I think we can rely
235 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
236 (extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \
237 REGISTER_RAW_SIZE (V0_REGNUM)))
239 /* Structures are returned by ref in extra arg0 */
240 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
243 /* Describe the pointer in each stack frame to the previous stack frame
246 /* FRAME_CHAIN takes a frame's nominal address
247 and produces the frame's chain-pointer. */
249 #define FRAME_CHAIN(thisframe) (CORE_ADDR) alpha_frame_chain (thisframe)
250 extern CORE_ADDR alpha_frame_chain
PARAMS ((struct frame_info
*));
252 /* Define other aspects of the stack frame. */
255 /* A macro that tells us whether the function invocation represented
256 by FI does not have a frame on the stack associated with it. If it
257 does not, FRAMELESS is set to 1, else 0. */
258 /* We handle this differently for alpha, and maybe we should not */
260 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
264 #define FRAME_SAVED_PC(FRAME) (alpha_frame_saved_pc(FRAME))
266 alpha_frame_saved_pc
PARAMS ((struct frame_info
*));
268 /* The alpha has two different virtual pointers for arguments and locals.
270 The virtual argument pointer is pointing to the bottom of the argument
271 transfer area, which is located immediately below the virtual frame
272 pointer. Its size is fixed for the native compiler, it is either zero
273 (for the no arguments case) or large enough to hold all argument registers.
274 gcc uses a variable sized argument transfer area. As it has
275 to stay compatible with the native debugging tools it has to use the same
276 virtual argument pointer and adjust the argument offsets accordingly.
278 The virtual local pointer is localoff bytes below the virtual frame
279 pointer, the value of localoff is obtained from the PDR. */
281 #define ALPHA_NUM_ARG_REGS 6
283 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame - (ALPHA_NUM_ARG_REGS * 8))
285 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame - (fi)->localoff)
287 /* Return number of args passed to a frame.
288 Can return -1, meaning no way to tell. */
290 #define FRAME_NUM_ARGS(num, fi) ((num) = -1)
292 /* Return number of bytes at start of arglist that are not really args. */
294 #define FRAME_ARGS_SKIP 0
296 /* Put here the code to store, into a struct frame_saved_regs,
297 the addresses of the saved registers of frame described by FRAME_INFO.
298 This includes special registers such as pc and fp saved in special
299 ways in the stack frame. sp is even more special:
300 the address we return for it IS the sp for the next frame. */
302 extern void alpha_find_saved_regs
PARAMS ((struct frame_info
*));
304 #define FRAME_INIT_SAVED_REGS(frame_info) \
306 if ((frame_info)->saved_regs == NULL) \
307 alpha_find_saved_regs (frame_info); \
308 (frame_info)->saved_regs[SP_REGNUM] = (frame_info)->frame; \
312 /* Things needed for making the inferior call functions. */
314 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
315 sp = alpha_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr))
317 alpha_push_arguments
PARAMS ((int, struct value
**, CORE_ADDR
, int, CORE_ADDR
));
319 /* Push an empty stack frame, to record the current PC, etc. */
321 #define PUSH_DUMMY_FRAME alpha_push_dummy_frame()
323 alpha_push_dummy_frame
PARAMS ((void));
325 /* Discard from the stack the innermost frame, restoring all registers. */
327 #define POP_FRAME alpha_pop_frame()
329 alpha_pop_frame
PARAMS ((void));
331 /* Alpha OSF/1 inhibits execution of code on the stack.
332 But there is no need for a dummy on the alpha. PUSH_ARGUMENTS
333 takes care of all argument handling and bp_call_dummy takes care
334 of stopping the dummy. */
336 #define CALL_DUMMY_LOCATION AT_ENTRY_POINT
338 /* On the Alpha the call dummy code is never copied to user space,
339 stopping the user call is achieved via a bp_call_dummy breakpoint.
340 But we need a fake CALL_DUMMY definition to enable the proper
341 call_function_by_hand and to avoid zero length array warnings
344 #define CALL_DUMMY { 0 } /* Content doesn't matter. */
346 #define CALL_DUMMY_START_OFFSET (0)
348 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
350 extern CORE_ADDR alpha_call_dummy_address
PARAMS ((void));
351 #define CALL_DUMMY_ADDRESS() alpha_call_dummy_address()
353 /* Insert the specified number of args and function address
354 into a call sequence of the above form stored at DUMMYNAME.
355 We only have to set RA_REGNUM to the dummy breakpoint address
356 and T12_REGNUM (the `procedure value register') to the function address. */
358 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
360 CORE_ADDR bp_address = CALL_DUMMY_ADDRESS (); \
361 if (bp_address == 0) \
362 error ("no place to put call"); \
363 write_register (RA_REGNUM, bp_address); \
364 write_register (T12_REGNUM, fun); \
367 /* There's a mess in stack frame creation. See comments in blockframe.c
368 near reference to INIT_FRAME_PC_FIRST. */
370 #define INIT_FRAME_PC(fromleaf, prev) /* nada */
372 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
373 (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
374 (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
376 /* Special symbol found in blocks associated with routines. We can hang
377 alpha_extra_func_info_t's off of this. */
379 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
380 extern void ecoff_relocate_efi
PARAMS ((struct symbol
*, CORE_ADDR
));
382 /* Specific information about a procedure.
383 This overlays the ALPHA's PDR records,
384 alpharead.c (ab)uses this to save memory */
386 typedef struct alpha_extra_func_info
{
387 long numargs
; /* number of args to procedure (was iopt) */
388 PDR pdr
; /* Procedure descriptor record */
389 } *alpha_extra_func_info_t
;
391 /* Define the extra_func_info that mipsread.c needs.
392 FIXME: We should define our own PDR interface, perhaps in a separate
393 header file. This would get rid of the <bfd.h> inclusion in all sources
394 and would abstract the mips/alpha interface from ecoff. */
395 #define mips_extra_func_info alpha_extra_func_info
396 #define mips_extra_func_info_t alpha_extra_func_info_t
398 #define EXTRA_FRAME_INFO \
401 alpha_extra_func_info_t proc_desc;
403 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
405 init_extra_frame_info
PARAMS ((struct frame_info
*));
407 #define PRINT_EXTRA_FRAME_INFO(fi) \
409 if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \
410 printf_filtered (" frame pointer is at %s+%d\n", \
411 REGISTER_NAME (fi->proc_desc->pdr.framereg), \
412 fi->proc_desc->pdr.frameoffset); \
415 /* It takes two values to specify a frame on the ALPHA. Sigh.
417 In fact, at the moment, the *PC* is the primary value that sets up
418 a frame. The PC is looked up to see what function it's in; symbol
419 information from that function tells us which register is the frame
420 pointer base, and what offset from there is the "virtual frame pointer".
421 (This is usually an offset from SP.) FIXME -- this should be cleaned
422 up so that the primary value is the SP, and the PC is used to disambiguate
423 multiple functions with the same SP that are at different stack levels. */
425 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
426 extern struct frame_info
*setup_arbitrary_frame
PARAMS ((int, CORE_ADDR
*));
428 /* This is used by heuristic_proc_start. It should be shot it the head. */
429 #ifndef VM_MIN_ADDRESS
430 #define VM_MIN_ADDRESS (CORE_ADDR)0x120000000
433 /* If PC is in a shared library trampoline code, return the PC
434 where the function itself actually starts. If not, return 0. */
435 #define SKIP_TRAMPOLINE_CODE(pc) find_solib_trampoline_target (pc)
437 /* If the current gcc for for this target does not produce correct debugging
438 information for float parameters, both prototyped and unprototyped, then
439 define this macro. This forces gdb to always assume that floats are
440 passed as doubles and then converted in the callee.
442 For the alpha, it appears that the debug info marks the parameters as
443 floats regardless of whether the function is prototyped, but the actual
444 values are always passed in as doubles. Thus by setting this to 1, both
445 types of calls will work. */
447 #define COERCE_FLOAT_TO_DOUBLE 1
449 /* Return TRUE if procedure descriptor PROC is a procedure descriptor
450 that refers to a dynamically generated sigtramp function.
452 OSF/1 doesn't use dynamic sigtramp functions, so this is always
455 #define PROC_DESC_IS_DYN_SIGTRAMP(proc) (0)
456 #define SET_PROC_DESC_IS_DYN_SIGTRAMP(proc)
458 /* If PC is inside a dynamically generated sigtramp function, return
459 how many bytes the program counter is beyond the start of that
460 function. Otherwise, return a negative value.
462 OSF/1 doesn't use dynamic sigtramp functions, so this always
465 #define DYNAMIC_SIGTRAMP_OFFSET(pc) (-1)
467 /* Translate a signal handler frame into the address of the sigcontext
470 #define SIGCONTEXT_ADDR(frame) \
471 (read_memory_integer ((frame)->next ? frame->next->frame : frame->frame, 8))
473 /* If FRAME refers to a sigtramp frame, return the address of the next
476 #define FRAME_PAST_SIGTRAMP_FRAME(frame, pc) \
477 (alpha_osf_skip_sigtramp_frame (frame, pc))
478 extern CORE_ADDR alpha_osf_skip_sigtramp_frame
PARAMS ((struct frame_info
*, CORE_ADDR
));
480 #endif /* TM_ALPHA_H */