1 /* Definitions to make GDB run on a mips box under 4.3bsd.
2 Copyright (C) 1986, 1987, 1989, 1991 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 ZERO_REGNUM 0 /* read-only register, always 0 */
124 #define SP_REGNUM 29 /* Contains address of top of stack */
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 BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */
130 #define CAUSE_REGNUM 36 /* describes last exception */
131 #define PC_REGNUM 37 /* Contains program counter */
132 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
133 #define FCRCS_REGNUM 70 /* FP control/status */
134 #define FCRIR_REGNUM 71 /* FP implementation/revision */
135 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
137 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
138 of register dumps. */
140 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
142 /* Total amount of space needed to store our copies of the machine's
143 register state, the array `registers'. */
144 #define REGISTER_BYTES (NUM_REGS*4)
146 /* Index within `registers' of the first byte of the space for
149 #define REGISTER_BYTE(N) ((N) * 4)
151 /* Number of bytes of storage in the actual machine representation
152 for register N. On mips, all regs are 4 bytes. */
154 #define REGISTER_RAW_SIZE(N) 4
156 /* Number of bytes of storage in the program's representation
157 for register N. On mips, all regs are 4 bytes. */
159 #define REGISTER_VIRTUAL_SIZE(N) 4
161 /* Largest value REGISTER_RAW_SIZE can have. */
163 #define MAX_REGISTER_RAW_SIZE 4
165 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
167 #define MAX_REGISTER_VIRTUAL_SIZE 4
169 /* Nonzero if register N requires conversion
170 from raw format to virtual format. */
172 #define REGISTER_CONVERTIBLE(N) 0
174 /* Convert data from raw format for register REGNUM
175 to virtual format for register REGNUM. */
177 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
178 bcopy ((FROM), (TO), 4);
180 /* Convert data from virtual format for register REGNUM
181 to raw format for register REGNUM. */
183 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
184 bcopy ((FROM), (TO), 4);
186 /* Return the GDB type object for the "standard" data type
187 of data in register N. */
189 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
190 /* Store the address of the place in which to copy the structure the
191 subroutine will return. This is called from call_function. */
193 #define STORE_STRUCT_RETURN(addr, sp) \
194 { sp = push_word(sp, addr);}
196 /* Extract from an array REGBUF containing the (raw) register state
197 a function return value of type TYPE, and copy that, in virtual format,
198 into VALBUF. XXX floats */
200 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
201 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
203 /* Write into appropriate registers a function return value
204 of type TYPE, given in virtual format. */
206 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
207 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
209 /* Extract from an array REGBUF containing the (raw) register state
210 the address in which a function should return its structure value,
211 as a CORE_ADDR (or an expression that can be used as one). */
213 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
215 /* Structures are returned by ref in extra arg0 */
216 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
219 /* Describe the pointer in each stack frame to the previous stack frame
222 /* FRAME_CHAIN takes a frame's nominal address
223 and produces the frame's chain-pointer.
225 However, if FRAME_CHAIN_VALID returns zero,
226 it means the given frame is the outermost one and has no caller. */
228 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
230 #define FRAME_CHAIN_VALID(chain, thisframe) \
231 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
233 /* Define other aspects of the stack frame. */
236 /* A macro that tells us whether the function invocation represented
237 by FI does not have a frame on the stack associated with it. If it
238 does not, FRAMELESS is set to 1, else 0. */
239 /* We handle this differently for mips, and maybe we should not */
241 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
245 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
247 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
249 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
251 /* Return number of args passed to a frame.
252 Can return -1, meaning no way to tell. */
254 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
256 /* Return number of bytes at start of arglist that are not really args. */
258 #define FRAME_ARGS_SKIP 0
260 /* Put here the code to store, into a struct frame_saved_regs,
261 the addresses of the saved registers of frame described by FRAME_INFO.
262 This includes special registers such as pc and fp saved in special
263 ways in the stack frame. sp is even more special:
264 the address we return for it IS the sp for the next frame. */
266 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
267 (frame_saved_regs) = *(frame_info)->saved_regs, \
268 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
271 /* Things needed for making the inferior call functions. */
273 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
274 to take care of it. */
275 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
277 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
278 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
280 /* Push an empty stack frame, to record the current PC, etc. */
282 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
284 /* Discard from the stack the innermost frame, restoring all registers. */
286 #define POP_FRAME mips_pop_frame()
288 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
289 #define CALL_DUMMY_SIZE (16*4)
291 #define CALL_DUMMY {\
292 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
293 0, /* nop # ... to stop raw backtrace*/\
294 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
296 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
297 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
298 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
299 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
300 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
301 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
302 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
303 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
304 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
305 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
306 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
307 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
311 #define CALL_DUMMY_START_OFFSET 12
313 /* Insert the specified number of args and function address
314 into a call sequence of the above form stored at DUMMYNAME. */
316 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
317 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
318 ((int*)dummyname)[12] |= (unsigned short)(fun))
320 /* Specific information about a procedure.
321 This overlays the MIPS's PDR records,
322 mipsread.c (ab)uses this to save memory */
324 typedef struct mips_extra_func_info
{
325 unsigned long adr
; /* memory address of start of procedure */
326 long isym
; /* pointer to procedure symbol */
327 long pad2
; /* iline: start of line number entries*/
328 long regmask
; /* save register mask */
329 long regoffset
; /* save register offset */
330 long numargs
; /* number of args to procedure (was iopt) */
331 long fregmask
; /* save floating point register mask */
332 long fregoffset
; /* save floating point register offset */
333 long framesize
; /* frameoffset: frame size */
334 short framereg
; /* frame pointer register */
335 short pcreg
; /* offset or reg of return pc */
336 long lnLow
; /* lowest line in the procedure */
337 long lnHigh
; /* highest line in the procedure */
338 long pad3
; /* cbLineOffset: byte offset for this procedure from the fd base */
339 } *mips_extra_func_info_t
;
341 #define EXTRA_FRAME_INFO \
342 char *proc_desc; /* actually, a mips_extra_func_info_t */\
344 struct frame_saved_regs *saved_regs;
346 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)