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 /* Address of blocks in N_LBRAC and N_RBRAC symbols are absolute addresses,
35 not relative to start of source address. */
36 #define BLOCK_ADDRESS_ABSOLUTE
38 /* Debugger information will be in mips' format */
40 #define READ_MIPS_FORMAT
42 /* File format is coff, but with additions */
46 /* Offset from address of function to start of its code.
47 Zero on most machines. */
49 #define FUNCTION_START_OFFSET 0
51 /* Advance PC across any function entry prologue instructions
52 to reach some "real" code. */
54 #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc)
56 /* Immediately after a function call, return the saved pc.
57 Can't always go through the frames for this because on some machines
58 the new frame is not set up until the new function executes
61 #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM)
63 /* Are we currently handling a signal */
65 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
67 /* Address of end of stack space. */
69 #define STACK_END_ADDR (0x7ffff000)
71 /* Stack grows downward. */
75 #define BIG_ENDIAN 4321
76 #if TARGET_BYTE_ORDER == BIG_ENDIAN
77 #define BREAKPOINT {0, 0x5, 0, 0xd}
79 #define BREAKPOINT {0xd, 0, 0x5, 0}
82 /* Amount PC must be decremented by after a breakpoint.
83 This is often the number of bytes in BREAKPOINT
86 #define DECR_PC_AFTER_BREAK 0
88 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
90 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
92 /* Return 1 if P points to an invalid floating point value. */
94 #define INVALID_FLOAT(p,l) isa_NAN(p,l)
96 /* Say how long (all) registers are. */
98 #define REGISTER_TYPE long
100 /* Number of machine registers */
104 /* Initializer for an array of names of registers.
105 There should be NUM_REGS strings in this initializer. */
107 #define REGISTER_NAMES \
108 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
109 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
110 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
111 "t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
112 "sr", "lo", "hi", "bad", "cause","pc", \
113 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
114 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
115 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
116 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
120 /* Register numbers of various important registers.
121 Note that some of these values are "real" register numbers,
122 and correspond to the general registers of the machine,
123 and some are "phony" register numbers which are too large
124 to be actual register numbers as far as the user is concerned
125 but do serve to get the desired values when passed to read_register. */
127 #define ZERO_REGNUM 0 /* read-only register, always 0 */
128 #define SP_REGNUM 29 /* Contains address of top of stack */
129 #define RA_REGNUM 31 /* Contains return address value */
130 #define PS_REGNUM 32 /* Contains processor status */
131 #define HI_REGNUM 34 /* Multiple/divide temp */
132 #define LO_REGNUM 33 /* ... */
133 #define BADVADDR_REGNUM 35 /* bad vaddr for addressing exception */
134 #define CAUSE_REGNUM 36 /* describes last exception */
135 #define PC_REGNUM 37 /* Contains program counter */
136 #define FP0_REGNUM 38 /* Floating point register 0 (single float) */
137 #define FCRCS_REGNUM 70 /* FP control/status */
138 #define FCRIR_REGNUM 71 /* FP implementation/revision */
139 #define FP_REGNUM 72 /* Pseudo register that contains true address of executing stack frame */
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) builtin_type_int
194 /* Store the address of the place in which to copy the structure the
195 subroutine will return. This is called from call_function. */
197 #define STORE_STRUCT_RETURN(addr, sp) \
198 { sp = push_word(sp, addr);}
200 /* Extract from an array REGBUF containing the (raw) register state
201 a function return value of type TYPE, and copy that, in virtual format,
202 into VALBUF. XXX floats */
204 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
205 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
207 /* Write into appropriate registers a function return value
208 of type TYPE, given in virtual format. */
210 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
211 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
213 /* Extract from an array REGBUF containing the (raw) register state
214 the address in which a function should return its structure value,
215 as a CORE_ADDR (or an expression that can be used as one). */
217 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
219 /* Structures are returned by ref in extra arg0 */
220 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
223 /* Describe the pointer in each stack frame to the previous stack frame
226 /* FRAME_CHAIN takes a frame's nominal address
227 and produces the frame's chain-pointer.
229 However, if FRAME_CHAIN_VALID returns zero,
230 it means the given frame is the outermost one and has no caller. */
232 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
234 #define FRAME_CHAIN_VALID(chain, thisframe) \
235 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
237 /* Define other aspects of the stack frame. */
240 /* A macro that tells us whether the function invocation represented
241 by FI does not have a frame on the stack associated with it. If it
242 does not, FRAMELESS is set to 1, else 0. */
243 /* We handle this differently for mips, and maybe we should not */
245 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
249 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
251 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
253 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
255 /* Return number of args passed to a frame.
256 Can return -1, meaning no way to tell. */
258 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
260 /* Return number of bytes at start of arglist that are not really args. */
262 #define FRAME_ARGS_SKIP 0
264 /* Put here the code to store, into a struct frame_saved_regs,
265 the addresses of the saved registers of frame described by FRAME_INFO.
266 This includes special registers such as pc and fp saved in special
267 ways in the stack frame. sp is even more special:
268 the address we return for it IS the sp for the next frame. */
270 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
271 (frame_saved_regs) = *(frame_info)->saved_regs, \
272 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
275 /* Things needed for making the inferior call functions. */
277 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
278 to take care of it. */
279 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
281 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
282 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
284 /* Push an empty stack frame, to record the current PC, etc. */
286 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
288 /* Discard from the stack the innermost frame, restoring all registers. */
290 #define POP_FRAME mips_pop_frame()
292 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
293 #define CALL_DUMMY_SIZE (16*4)
295 #define CALL_DUMMY {\
296 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
297 0, /* nop # ... to stop raw backtrace*/\
298 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
300 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
301 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
302 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
303 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
304 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
305 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
306 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
307 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
308 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
309 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
310 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
311 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
315 #define CALL_DUMMY_START_OFFSET 12
317 /* Insert the specified number of args and function address
318 into a call sequence of the above form stored at DUMMYNAME. */
320 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
321 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
322 ((int*)dummyname)[12] |= (unsigned short)(fun))
324 /* Specific information about a procedure.
325 This overlays the MIPS's PDR records,
326 mipsread.c (ab)uses this to save memory */
328 typedef struct mips_extra_func_info
{
329 unsigned long adr
; /* memory address of start of procedure */
330 long isym
; /* pointer to procedure symbol */
331 long pad2
; /* iline: start of line number entries*/
332 long regmask
; /* save register mask */
333 long regoffset
; /* save register offset */
334 long numargs
; /* number of args to procedure (was iopt) */
335 long fregmask
; /* save floating point register mask */
336 long fregoffset
; /* save floating point register offset */
337 long framesize
; /* frameoffset: frame size */
338 short framereg
; /* frame pointer register */
339 short pcreg
; /* offset or reg of return pc */
340 long lnLow
; /* lowest line in the procedure */
341 long lnHigh
; /* highest line in the procedure */
342 long pad3
; /* cbLineOffset: byte offset for this procedure from the fd base */
343 } *mips_extra_func_info_t
;
345 #define EXTRA_FRAME_INFO \
346 char *proc_desc; /* actually, a mips_extra_func_info_t */\
348 struct frame_saved_regs *saved_regs;
350 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
This page took 0.045653 seconds and 5 git commands to generate.