1 /* Definitions to make GDB run on a mips box under 4.3bsd.
2 Copyright (C) 1986, 1987, 1989 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 #if !defined (TARGET_BYTE_ORDER)
23 #define TARGET_BYTE_ORDER LITTLE_ENDIAN
26 /* Floating point is IEEE compliant */
29 /* Define this if the C compiler puts an underscore at the front
30 of external names before giving them to the linker. */
32 /*#define NAMES_HAVE_UNDERSCORE*/
34 /* Debugger information will be in mips' format */
36 #define READ_MIPS_FORMAT
38 /* File format is coff, but with additions */
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",\
116 /* Register numbers of various important registers.
117 Note that some of these values are "real" register numbers,
118 and correspond to the general registers of the machine,
119 and some are "phony" register numbers which are too large
120 to be actual register numbers as far as the user is concerned
121 but do serve to get the desired values when passed to read_register. */
123 #define SP_REGNUM 29 /* Contains address of top of stack */
124 #define PC_REGNUM 37 /* Contains program counter */
125 #define RA_REGNUM 31 /* Contains return address value */
126 #define PS_REGNUM 32 /* Contains processor status */
127 #define HI_REGNUM 34 /* Multiple/divide temp */
128 #define LO_REGNUM 33 /* ... */
129 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
130 #define FCRCS_REGNUM 70 /* FP control/status */
131 #define FCRIR_REGNUM 71 /* FP implementation/revision */
132 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
134 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
135 of register dumps. */
137 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
139 #define REGISTER_U_ADDR(addr, blockend, regno) \
140 if (blockend == 0) { \
141 if (regno < 38) addr = (NBPG*UPAGES) + (regno - 38)*sizeof(int);\
142 else addr = 0; /* ..somewhere in the pcb */ \
143 } else if (regno < 32) addr = regno; \
144 else if (regno == PC_REGNUM) addr = 96; \
145 else if (regno == 36) addr = 97; \
146 else if (regno == HI_REGNUM) addr = 98; \
147 else if (regno == LO_REGNUM) addr = 99; \
148 else if (regno == FCRCS_REGNUM) addr = 100; \
149 else if (regno == FCRIR_REGNUM) addr = 101; \
150 else if (regno >= FP0_REGNUM) addr = regno - (FP0_REGNUM-32);\
153 /* Total amount of space needed to store our copies of the machine's
154 register state, the array `registers'. */
155 #define REGISTER_BYTES (NUM_REGS*4)
157 /* Index within `registers' of the first byte of the space for
160 #define REGISTER_BYTE(N) ((N) * 4)
162 /* Number of bytes of storage in the actual machine representation
163 for register N. On mips, all regs are 4 bytes. */
165 #define REGISTER_RAW_SIZE(N) 4
167 /* Number of bytes of storage in the program's representation
168 for register N. On mips, all regs are 4 bytes. */
170 #define REGISTER_VIRTUAL_SIZE(N) 4
172 /* Largest value REGISTER_RAW_SIZE can have. */
174 #define MAX_REGISTER_RAW_SIZE 4
176 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
178 #define MAX_REGISTER_VIRTUAL_SIZE 4
180 /* Nonzero if register N requires conversion
181 from raw format to virtual format. */
183 #define REGISTER_CONVERTIBLE(N) 0
185 /* Convert data from raw format for register REGNUM
186 to virtual format for register REGNUM. */
188 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
189 bcopy ((FROM), (TO), 4);
191 /* Convert data from virtual format for register REGNUM
192 to raw format for register REGNUM. */
194 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
195 bcopy ((FROM), (TO), 4);
197 /* Return the GDB type object for the "standard" data type
198 of data in register N. */
200 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
201 /* Store the address of the place in which to copy the structure the
202 subroutine will return. This is called from call_function. */
204 #define STORE_STRUCT_RETURN(addr, sp) \
205 { sp = push_word(sp, addr);}
207 /* Extract from an array REGBUF containing the (raw) register state
208 a function return value of type TYPE, and copy that, in virtual format,
209 into VALBUF. XXX floats */
211 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
212 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
214 /* Write into appropriate registers a function return value
215 of type TYPE, given in virtual format. */
217 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
218 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
220 /* Extract from an array REGBUF containing the (raw) register state
221 the address in which a function should return its structure value,
222 as a CORE_ADDR (or an expression that can be used as one). */
224 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
226 /* Structures are returned by ref in extra arg0 */
227 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
230 /* Describe the pointer in each stack frame to the previous stack frame
233 /* FRAME_CHAIN takes a frame's nominal address
234 and produces the frame's chain-pointer.
236 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
237 and produces the nominal address of the caller frame.
239 However, if FRAME_CHAIN_VALID returns zero,
240 it means the given frame is the outermost one and has no caller.
241 In that case, FRAME_CHAIN_COMBINE is not used. */
243 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
245 #define FRAME_CHAIN_VALID(chain, thisframe) \
246 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
248 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
250 /* Define other aspects of the stack frame. */
253 /* A macro that tells us whether the function invocation represented
254 by FI does not have a frame on the stack associated with it. If it
255 does not, FRAMELESS is set to 1, else 0. */
256 /* We handle this differently for mips, and maybe we should not */
258 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
262 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
264 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
266 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
268 /* Return number of args passed to a frame.
269 Can return -1, meaning no way to tell. */
271 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
273 /* Return number of bytes at start of arglist that are not really args. */
275 #define FRAME_ARGS_SKIP 0
277 /* Put here the code to store, into a struct frame_saved_regs,
278 the addresses of the saved registers of frame described by FRAME_INFO.
279 This includes special registers such as pc and fp saved in special
280 ways in the stack frame. sp is even more special:
281 the address we return for it IS the sp for the next frame. */
283 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
284 (frame_saved_regs) = *(frame_info)->saved_regs, \
285 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
288 /* Things needed for making the inferior call functions. */
290 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
291 to take care of it. */
292 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
294 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
295 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
297 /* Push an empty stack frame, to record the current PC, etc. */
299 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
301 /* Discard from the stack the innermost frame, restoring all registers. */
303 #define POP_FRAME mips_pop_frame()
305 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
306 #define CALL_DUMMY_SIZE (16*4)
308 #define CALL_DUMMY {\
309 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
310 0, /* nop # ... to stop raw backtrace*/\
311 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
313 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
314 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
315 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
316 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
317 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
318 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
319 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
320 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
321 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
322 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
323 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
324 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
328 #define CALL_DUMMY_START_OFFSET 12
330 /* Insert the specified number of args and function address
331 into a call sequence of the above form stored at DUMMYNAME. */
333 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
334 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
335 ((int*)dummyname)[12] |= (unsigned short)(fun))
337 /* Specific information about a procedure.
338 This overlays the MIPS's PDR records,
339 mipsread.c (ab)uses this to save memory */
341 typedef struct mips_extra_func_info
{
342 unsigned long adr
; /* memory address of start of procedure */
343 long isym
; /* pointer to procedure symbol */
344 long pad2
; /* iline: start of line number entries*/
345 long regmask
; /* save register mask */
346 long regoffset
; /* save register offset */
347 long numargs
; /* number of args to procedure (was iopt) */
348 long fregmask
; /* save floating point register mask */
349 long fregoffset
; /* save floating point register offset */
350 long framesize
; /* frameoffset: frame size */
351 short framereg
; /* frame pointer register */
352 short pcreg
; /* offset or reg of return pc */
353 long lnLow
; /* lowest line in the procedure */
354 long lnHigh
; /* highest line in the procedure */
355 long pad3
; /* cbLineOffset: byte offset for this procedure from the fd base */
356 } *mips_extra_func_info_t
;
358 #define EXTRA_FRAME_INFO \
359 char *proc_desc; /* actually, a mips_extra_func_info_t */\
361 struct frame_saved_regs *saved_regs;
363 #define INIT_EXTRA_FRAME_INFO(fci) init_extra_frame_info(fci)
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