ad09333d2541639fbff4ec5dc19128f696689bef
1 /* Definitions to make GDB run on a mips box under 4.3bsd.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc.
3 Contributed by Per Bothner (bothner@cs.wisc.edu) at U.Wisconsin
4 and by Alessandro Forin (af@cs.cmu.edu) at CMU..
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #include "coff/sym.h" /* Needed for PDR below. */
23 #include "coff/symconst.h"
25 #if !defined (TARGET_BYTE_ORDER)
26 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
29 /* FIXME, this triggers host-and-target (``native'') dependent code
30 which currently sits in mips-xdep.c. Needs to be moved out to
31 mips-nat.c or some such. */
32 #define GDB_TARGET_IS_MIPS
34 /* Floating point is IEEE compliant */
37 /* Define this if the C compiler puts an underscore at the front
38 of external names before giving them to the linker. */
40 /*#define NAMES_HAVE_UNDERSCORE*/
42 /* Offset from address of function to start of its code.
43 Zero on most machines. */
45 #define FUNCTION_START_OFFSET 0
47 /* Advance PC across any function entry prologue instructions
48 to reach some "real" code. */
50 #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc)
52 /* Immediately after a function call, return the saved pc.
53 Can't always go through the frames for this because on some machines
54 the new frame is not set up until the new function executes
57 #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM)
59 /* Are we currently handling a signal */
61 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
63 /* Address of end of stack space. */
65 #define STACK_END_ADDR (0x7ffff000)
67 /* Stack grows downward. */
71 #define BIG_ENDIAN 4321
72 #if TARGET_BYTE_ORDER == BIG_ENDIAN
73 #define BREAKPOINT {0, 0x5, 0, 0xd}
75 #define BREAKPOINT {0xd, 0, 0x5, 0}
78 /* Amount PC must be decremented by after a breakpoint.
79 This is often the number of bytes in BREAKPOINT
82 #define DECR_PC_AFTER_BREAK 0
84 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
86 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
88 /* Return 1 if P points to an invalid floating point value. */
90 #define INVALID_FLOAT(p,l) isa_NAN(p,l)
92 /* Say how long (all) registers are. */
94 #define REGISTER_TYPE long
96 /* Number of machine registers */
100 /* Initializer for an array of names of registers.
101 There should be NUM_REGS strings in this initializer. */
103 #define REGISTER_NAMES \
104 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
105 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
106 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
107 "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
108 "sr", "lo", "hi", "bad", "cause","pc", \
109 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
110 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
111 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
112 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
113 "fsr", "fir", "fp", "inx", "rand", "tlblo","ctxt", "tlbhi",\
117 /* Register numbers of various important registers.
118 Note that some of these values are "real" register numbers,
119 and correspond to the general registers of the machine,
120 and some are "phony" register numbers which are too large
121 to be actual register numbers as far as the user is concerned
122 but do serve to get the desired values when passed to read_register. */
124 #define ZERO_REGNUM 0 /* read-only register, always 0 */
125 #define A0_REGNUM 4 /* Loc of first arg during a subr call */
126 #define SP_REGNUM 29 /* Contains address of top of stack */
127 #define RA_REGNUM 31 /* Contains return address value */
128 #define PS_REGNUM 32 /* Contains processor status */
129 #define HI_REGNUM 34 /* Multiple/divide temp */
130 #define LO_REGNUM 33 /* ... */
131 #define BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */
132 #define CAUSE_REGNUM 36 /* describes last exception */
133 #define PC_REGNUM 37 /* Contains program counter */
134 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
135 #define FCRCS_REGNUM 70 /* FP control/status */
136 #define FCRIR_REGNUM 71 /* FP implementation/revision */
137 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
138 #define FIRST_EMBED_REGNUM 73 /* First supervisor register for embedded use */
139 #define LAST_EMBED_REGNUM 79 /* Last one */
141 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
142 of register dumps. */
144 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
146 /* Total amount of space needed to store our copies of the machine's
147 register state, the array `registers'. */
148 #define REGISTER_BYTES (NUM_REGS*4)
150 /* Index within `registers' of the first byte of the space for
153 #define REGISTER_BYTE(N) ((N) * 4)
155 /* Number of bytes of storage in the actual machine representation
156 for register N. On mips, all regs are 4 bytes. */
158 #define REGISTER_RAW_SIZE(N) 4
160 /* Number of bytes of storage in the program's representation
161 for register N. On mips, all regs are 4 bytes. */
163 #define REGISTER_VIRTUAL_SIZE(N) 4
165 /* Largest value REGISTER_RAW_SIZE can have. */
167 #define MAX_REGISTER_RAW_SIZE 4
169 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
171 #define MAX_REGISTER_VIRTUAL_SIZE 4
173 /* Nonzero if register N requires conversion
174 from raw format to virtual format. */
176 #define REGISTER_CONVERTIBLE(N) 0
178 /* Convert data from raw format for register REGNUM
179 to virtual format for register REGNUM. */
181 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
182 bcopy ((FROM), (TO), 4);
184 /* Convert data from virtual format for register REGNUM
185 to raw format for register REGNUM. */
187 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
188 bcopy ((FROM), (TO), 4);
190 /* Return the GDB type object for the "standard" data type
191 of data in register N. */
193 #define REGISTER_VIRTUAL_TYPE(N) \
194 (((N) >= FP0_REGNUM && (N) < FP0_REGNUM+32) \
195 ? builtin_type_float : builtin_type_int) \
197 /* Store the address of the place in which to copy the structure the
198 subroutine will return. This is called from call_function. */
200 #define STORE_STRUCT_RETURN(addr, sp) \
201 { sp = push_word(sp, addr);}
203 /* Extract from an array REGBUF containing the (raw) register state
204 a function return value of type TYPE, and copy that, in virtual format,
205 into VALBUF. XXX floats */
207 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
208 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
210 /* Write into appropriate registers a function return value
211 of type TYPE, given in virtual format. */
213 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
214 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
216 /* Extract from an array REGBUF containing the (raw) register state
217 the address in which a function should return its structure value,
218 as a CORE_ADDR (or an expression that can be used as one). */
220 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
222 /* Structures are returned by ref in extra arg0 */
223 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
226 /* Describe the pointer in each stack frame to the previous stack frame
229 /* FRAME_CHAIN takes a frame's nominal address
230 and produces the frame's chain-pointer. */
232 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
234 /* Define other aspects of the stack frame. */
237 /* A macro that tells us whether the function invocation represented
238 by FI does not have a frame on the stack associated with it. If it
239 does not, FRAMELESS is set to 1, else 0. */
240 /* We handle this differently for mips, and maybe we should not */
242 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
246 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
248 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
250 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
252 /* Return number of args passed to a frame.
253 Can return -1, meaning no way to tell. */
255 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
257 /* Return number of bytes at start of arglist that are not really args. */
259 #define FRAME_ARGS_SKIP 0
261 /* Put here the code to store, into a struct frame_saved_regs,
262 the addresses of the saved registers of frame described by FRAME_INFO.
263 This includes special registers such as pc and fp saved in special
264 ways in the stack frame. sp is even more special:
265 the address we return for it IS the sp for the next frame. */
267 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
268 (frame_saved_regs) = *(frame_info)->saved_regs, \
269 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
272 /* Things needed for making the inferior call functions. */
274 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
275 to take care of it. */
276 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
278 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
279 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
281 /* Push an empty stack frame, to record the current PC, etc. */
283 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
285 /* Discard from the stack the innermost frame, restoring all registers. */
287 #define POP_FRAME mips_pop_frame()
289 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
290 #define CALL_DUMMY_SIZE (16*4)
292 #define CALL_DUMMY {\
293 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
294 0, /* nop # ... to stop raw backtrace*/\
295 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
297 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
298 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
299 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
300 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
301 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
302 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
303 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
304 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
305 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
306 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
307 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
308 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
312 #define CALL_DUMMY_START_OFFSET 12
314 /* Insert the specified number of args and function address
315 into a call sequence of the above form stored at DUMMYNAME. */
317 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
318 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
319 ((int*)dummyname)[12] |= (unsigned short)(fun))
321 /* There's a mess in stack frame creation. See comments in blockframe.c
322 near reference to INIT_FRAME_PC_FIRST. */
324 #define INIT_FRAME_PC(fromleaf, prev) /* nada */
326 #define INIT_FRAME_PC_FIRST(fromleaf, prev) \
327 (prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
328 (prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
330 /* Special symbol found in blocks associated with routines. We can hang
331 mips_extra_func_info_t's off of this. */
333 #define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
335 /* Specific information about a procedure.
336 This overlays the MIPS's PDR records,
337 mipsread.c (ab)uses this to save memory */
339 typedef struct mips_extra_func_info
{
340 long numargs
; /* number of args to procedure (was iopt) */
341 PDR pdr
; /* Procedure descriptor record */
342 } *mips_extra_func_info_t
;
344 #define EXTRA_FRAME_INFO \
345 mips_extra_func_info_t proc_desc; \
347 struct frame_saved_regs *saved_regs;
349 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
351 #define PRINT_EXTRA_FRAME_INFO(fi) \
353 if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \
354 printf_filtered (" frame pointer is at %s+%d\n", \
355 reg_names[fi->proc_desc->pdr.framereg], \
356 fi->proc_desc->pdr.frameoffset); \
359 /* It takes two values to specify a frame on the MIPS. Sigh.
361 In fact, at the moment, the *PC* is the primary value that sets up
362 a frame. The PC is looked up to see what function it's in; symbol
363 information from that function tells us which register is the frame
364 pointer base, and what offset from there is the "virtual frame pointer".
365 (This is usually an offset from SP.) FIXME -- this should be cleaned
366 up so that the primary value is the SP, and the PC is used to disambiguate
367 multiple functions with the same SP that are at different stack levels. */
369 #define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
370 extern struct frame_info
*setup_arbitrary_frame ();
372 #define STAB_REG_TO_REGNUM(num) ((num) < 32 ? (num) : (num)+FP0_REGNUM-32)