1 /* Copyright (C) 1990 Free Software Foundation, Inc.
3 This file is part of GDB.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 #define TARGET_BYTE_ORDER BIG_ENDIAN
21 /* Floating point is IEEE compliant */
24 /* Define this if the C compiler puts an underscore at the front
25 of external names before giving them to the linker. */
27 /*#define NAMES_HAVE_UNDERSCORE*/
29 /* Debugger information will be in mips' format */
31 #define READ_MIPS_FORMAT
33 /* File format is coff, but with additions */
37 /* Offset from address of function to start of its code.
38 Zero on most machines. */
40 #define FUNCTION_START_OFFSET 0
42 /* Advance PC across any function entry prologue instructions
43 to reach some "real" code. */
45 #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc)
47 /* Immediately after a function call, return the saved pc.
48 Can't always go through the frames for this because on some machines
49 the new frame is not set up until the new function executes
52 #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM)
54 /* Are we currently handling a signal */
56 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
58 /* Address of end of stack space. */
60 #define STACK_END_ADDR (0x7ffff000)
62 /* Stack grows downward. */
66 #define BREAKPOINT {0, 0x5, 0, 0xd}
68 /* Amount PC must be decremented by after a breakpoint.
69 This is often the number of bytes in BREAKPOINT
72 #define DECR_PC_AFTER_BREAK 0
74 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
76 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
78 /* Return 1 if P points to an invalid floating point value. */
80 #define INVALID_FLOAT(p,l) isa_NAN(p,l)
82 /* Say how long (all) registers are. */
84 #define REGISTER_TYPE long
86 /* Number of machine registers */
90 /* Initializer for an array of names of registers.
91 There should be NUM_REGS strings in this initializer. */
93 #define REGISTER_NAMES \
94 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
95 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
96 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
97 "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra", \
98 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
99 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
100 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
101 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
102 "pc", "cause", "bad", "hi", "lo", "fsr", "fir" \
105 /* Register numbers of various important registers.
106 Note that some of these values are "real" register numbers,
107 and correspond to the general registers of the machine,
108 and some are "phony" register numbers which are too large
109 to be actual register numbers as far as the user is concerned
110 but do serve to get the desired values when passed to read_register. */
112 #define SP_REGNUM 29 /* Contains address of top of stack */
113 #define FP_REGNUM 30 /* Pseudo register that contains true address of executing stack frame */
114 #define RA_REGNUM 31 /* Contains return address value */
115 #define FP0_REGNUM 32 /* Floating point register 0 (single float) */
116 #define PC_REGNUM 64 /* Contains program counter */
117 #define PS_REGNUM 65 /* Contains processor status */
118 #define HI_REGNUM 67 /* Multiple/divide temp */
119 #define LO_REGNUM 68 /* ... */
120 #define FCRCS_REGNUM 69 /* FP control/status */
121 #define FCRIR_REGNUM 70 /* FP implementation/revision */
123 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
124 of register dumps. */
126 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
128 /* Total amount of space needed to store our copies of the machine's
129 register state, the array `registers'. */
130 #define REGISTER_BYTES (NUM_REGS*4)
132 /* Index within `registers' of the first byte of the space for
135 #define REGISTER_BYTE(N) ((N) * 4)
137 /* Number of bytes of storage in the actual machine representation
138 for register N. On mips, all regs are 4 bytes. */
140 #define REGISTER_RAW_SIZE(N) 4
142 /* Number of bytes of storage in the program's representation
143 for register N. On mips, all regs are 4 bytes. */
145 #define REGISTER_VIRTUAL_SIZE(N) 4
147 /* Largest value REGISTER_RAW_SIZE can have. */
149 #define MAX_REGISTER_RAW_SIZE 4
151 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
153 #define MAX_REGISTER_VIRTUAL_SIZE 4
155 /* Nonzero if register N requires conversion
156 from raw format to virtual format. */
158 #define REGISTER_CONVERTIBLE(N) 0
160 /* Convert data from raw format for register REGNUM
161 to virtual format for register REGNUM. */
163 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
164 bcopy ((FROM), (TO), 4);
166 /* Convert data from virtual format for register REGNUM
167 to raw format for register REGNUM. */
169 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
170 bcopy ((FROM), (TO), 4);
172 /* Return the GDB type object for the "standard" data type
173 of data in register N. */
175 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
176 /* Store the address of the place in which to copy the structure the
177 subroutine will return. This is called from call_function. */
179 #define STORE_STRUCT_RETURN(addr, sp) \
180 { sp = push_word(sp, addr);}
182 /* Extract from an array REGBUF containing the (raw) register state
183 a function return value of type TYPE, and copy that, in virtual format,
184 into VALBUF. XXX floats */
186 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
187 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
189 /* Write into appropriate registers a function return value
190 of type TYPE, given in virtual format. */
192 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
193 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
195 /* Extract from an array REGBUF containing the (raw) register state
196 the address in which a function should return its structure value,
197 as a CORE_ADDR (or an expression that can be used as one). */
199 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
201 /* Structures are returned by ref in extra arg0 */
202 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
205 /* Describe the pointer in each stack frame to the previous stack frame
208 /* FRAME_CHAIN takes a frame's nominal address
209 and produces the frame's chain-pointer.
211 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
212 and produces the nominal address of the caller frame.
214 However, if FRAME_CHAIN_VALID returns zero,
215 it means the given frame is the outermost one and has no caller.
216 In that case, FRAME_CHAIN_COMBINE is not used. */
218 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
220 #define FRAME_CHAIN_VALID(chain, thisframe) \
221 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
223 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
225 /* Define other aspects of the stack frame. */
228 /* A macro that tells us whether the function invocation represented
229 by FI does not have a frame on the stack associated with it. If it
230 does not, FRAMELESS is set to 1, else 0. */
231 /* We handle this differently for mips, and maybe we should not */
233 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
237 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
239 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
241 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
243 /* Return number of args passed to a frame.
244 Can return -1, meaning no way to tell. */
246 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
248 /* Return number of bytes at start of arglist that are not really args. */
250 #define FRAME_ARGS_SKIP 0
252 /* Put here the code to store, into a struct frame_saved_regs,
253 the addresses of the saved registers of frame described by FRAME_INFO.
254 This includes special registers such as pc and fp saved in special
255 ways in the stack frame. sp is even more special:
256 the address we return for it IS the sp for the next frame. */
258 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
259 (frame_saved_regs) = *(frame_info)->saved_regs, \
260 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
263 /* Things needed for making the inferior call functions. */
265 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
266 to take care of it. */
267 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
269 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
270 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
272 /* Push an empty stack frame, to record the current PC, etc. */
274 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
276 /* Discard from the stack the innermost frame, restoring all registers. */
278 #define POP_FRAME mips_pop_frame()
280 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
281 #define CALL_DUMMY_SIZE (16*4)
283 #define CALL_DUMMY {\
284 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
285 0, /* nop # ... to stop raw backtrace*/\
286 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
288 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
289 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
290 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
291 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
292 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
293 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
294 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
295 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
296 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
297 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
298 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
299 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
303 #define CALL_DUMMY_START_OFFSET 12
305 /* Insert the specified number of args and function address
306 into a call sequence of the above form stored at DUMMYNAME. */
308 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
309 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
310 ((int*)dummyname)[12] |= (unsigned short)(fun))
312 /* Specific information about a procedure.
313 This overlays the MIPS's PDR records,
314 mipsread.c (ab)uses this to save memory */
316 typedef struct mips_extra_func_info
{
317 unsigned long adr
; /* memory address of start of procedure */
318 long isym
; /* pointer to procedure symbol */
319 long pad2
; /* iline: start of line number entries*/
320 long regmask
; /* save register mask */
321 long regoffset
; /* save register offset */
322 long numargs
; /* number of args to procedure (was iopt) */
323 long fregmask
; /* save floating point register mask */
324 long fregoffset
; /* save floating point register offset */
325 long framesize
; /* frameoffset: frame size */
326 short framereg
; /* frame pointer register */
327 short pcreg
; /* offset or reg of return pc */
328 long lnLow
; /* lowest line in the procedure */
329 long lnHigh
; /* highest line in the procedure */
330 long pad3
; /* cbLineOffset: byte offset for this procedure from the fd base */
331 } *mips_extra_func_info_t
;
333 #define EXTRA_FRAME_INFO \
334 char *proc_desc; /* actually, a mips_extra_func_info_t */\
336 struct frame_saved_regs *saved_regs;
338 #define INIT_EXTRA_FRAME_INFO(fci) init_extra_frame_info(fci)
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