884330260bb1485e5c10b10fddf8ce9c6a4f5de5
1 /* Target machine description for SGI Iris under Irix, for GDB.
2 Copyright 1990, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 #define TARGET_BYTE_ORDER BIG_ENDIAN
22 /* Floating point is IEEE compliant */
25 /* Define this if the C compiler puts an underscore at the front
26 of external names before giving them to the linker. */
28 /*#define NAMES_HAVE_UNDERSCORE*/
30 /* Offset from address of function to start of its code.
31 Zero on most machines. */
33 #define FUNCTION_START_OFFSET 0
35 /* Advance PC across any function entry prologue instructions
36 to reach some "real" code. */
38 #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc)
40 /* Immediately after a function call, return the saved pc.
41 Can't always go through the frames for this because on some machines
42 the new frame is not set up until the new function executes
45 #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM)
47 /* Are we currently handling a signal */
49 #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
51 /* Address of end of stack space. */
53 #define STACK_END_ADDR (0x7ffff000)
55 /* Stack grows downward. */
59 #define BREAKPOINT {0, 0x5, 0, 0xd}
61 /* Amount PC must be decremented by after a breakpoint.
62 This is often the number of bytes in BREAKPOINT
65 #define DECR_PC_AFTER_BREAK 0
67 /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
69 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
71 /* Return 1 if P points to an invalid floating point value. */
73 #define INVALID_FLOAT(p,l) isa_NAN(p,l)
75 /* Say how long (all) registers are. */
77 #define REGISTER_TYPE long
79 /* Number of machine registers */
83 /* Initializer for an array of names of registers.
84 There should be NUM_REGS strings in this initializer. */
86 #define REGISTER_NAMES \
87 { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
88 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
89 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
90 "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra", \
91 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
92 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
93 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
94 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
95 "pc", "cause", "bad", "hi", "lo", "fsr", "fir" \
98 /* Register numbers of various important registers.
99 Note that some of these values are "real" register numbers,
100 and correspond to the general registers of the machine,
101 and some are "phony" register numbers which are too large
102 to be actual register numbers as far as the user is concerned
103 but do serve to get the desired values when passed to read_register. */
105 #define SP_REGNUM 29 /* Contains address of top of stack */
106 #define FP_REGNUM 30 /* Pseudo register that contains true address of executing stack frame */
107 #define RA_REGNUM 31 /* Contains return address value */
108 #define FP0_REGNUM 32 /* Floating point register 0 (single float) */
109 #define PC_REGNUM 64 /* Contains program counter */
110 #define PS_REGNUM 65 /* Contains processor status */
111 #define HI_REGNUM 67 /* Multiple/divide temp */
112 #define LO_REGNUM 68 /* ... */
113 #define FCRCS_REGNUM 69 /* FP control/status */
114 #define FCRIR_REGNUM 70 /* FP implementation/revision */
116 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
117 of register dumps. */
119 #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
121 /* Total amount of space needed to store our copies of the machine's
122 register state, the array `registers'. */
123 #define REGISTER_BYTES (NUM_REGS*4)
125 /* Index within `registers' of the first byte of the space for
128 #define REGISTER_BYTE(N) ((N) * 4)
130 /* Number of bytes of storage in the actual machine representation
131 for register N. On mips, all regs are 4 bytes. */
133 #define REGISTER_RAW_SIZE(N) 4
135 /* Number of bytes of storage in the program's representation
136 for register N. On mips, all regs are 4 bytes. */
138 #define REGISTER_VIRTUAL_SIZE(N) 4
140 /* Largest value REGISTER_RAW_SIZE can have. */
142 #define MAX_REGISTER_RAW_SIZE 4
144 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
146 #define MAX_REGISTER_VIRTUAL_SIZE 4
148 /* Nonzero if register N requires conversion
149 from raw format to virtual format. */
151 #define REGISTER_CONVERTIBLE(N) 0
153 /* Convert data from raw format for register REGNUM
154 to virtual format for register REGNUM. */
156 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
157 bcopy ((FROM), (TO), 4);
159 /* Convert data from virtual format for register REGNUM
160 to raw format for register REGNUM. */
162 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
163 bcopy ((FROM), (TO), 4);
165 /* Return the GDB type object for the "standard" data type
166 of data in register N. */
168 #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
169 /* Store the address of the place in which to copy the structure the
170 subroutine will return. This is called from call_function. */
172 #define STORE_STRUCT_RETURN(addr, sp) \
173 { sp = push_word(sp, addr);}
175 /* Extract from an array REGBUF containing the (raw) register state
176 a function return value of type TYPE, and copy that, in virtual format,
177 into VALBUF. XXX floats */
179 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
180 bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
182 /* Write into appropriate registers a function return value
183 of type TYPE, given in virtual format. */
185 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
186 write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE))
188 /* Extract from an array REGBUF containing the (raw) register state
189 the address in which a function should return its structure value,
190 as a CORE_ADDR (or an expression that can be used as one). */
192 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16))
194 /* Structures are returned by ref in extra arg0 */
195 #define USE_STRUCT_CONVENTION(gcc_p, type) 1
198 /* Describe the pointer in each stack frame to the previous stack frame
201 /* FRAME_CHAIN takes a frame's nominal address
202 and produces the frame's chain-pointer.
204 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
205 and produces the nominal address of the caller frame.
207 However, if FRAME_CHAIN_VALID returns zero,
208 it means the given frame is the outermost one and has no caller.
209 In that case, FRAME_CHAIN_COMBINE is not used. */
211 #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe)
213 #define FRAME_CHAIN_VALID(chain, thisframe) \
214 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
216 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
218 /* Define other aspects of the stack frame. */
221 /* A macro that tells us whether the function invocation represented
222 by FI does not have a frame on the stack associated with it. If it
223 does not, FRAMELESS is set to 1, else 0. */
224 /* We handle this differently for mips, and maybe we should not */
226 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
230 #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME))
232 #define FRAME_ARGS_ADDRESS(fi) (fi)->frame
234 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
236 /* Return number of args passed to a frame.
237 Can return -1, meaning no way to tell. */
239 #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi))
241 /* Return number of bytes at start of arglist that are not really args. */
243 #define FRAME_ARGS_SKIP 0
245 /* Put here the code to store, into a struct frame_saved_regs,
246 the addresses of the saved registers of frame described by FRAME_INFO.
247 This includes special registers such as pc and fp saved in special
248 ways in the stack frame. sp is even more special:
249 the address we return for it IS the sp for the next frame. */
251 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \
252 (frame_saved_regs) = *(frame_info)->saved_regs, \
253 (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
256 /* Things needed for making the inferior call functions. */
258 /* Stack has strict alignment. However, use PUSH_ARGUMENTS
259 to take care of it. */
260 /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
262 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
263 sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
265 /* Push an empty stack frame, to record the current PC, etc. */
267 #define PUSH_DUMMY_FRAME mips_push_dummy_frame()
269 /* Discard from the stack the innermost frame, restoring all registers. */
271 #define POP_FRAME mips_pop_frame()
273 #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
274 #define CALL_DUMMY_SIZE (16*4)
276 #define CALL_DUMMY {\
277 MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
278 0, /* nop # ... to stop raw backtrace*/\
279 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
281 MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
282 MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
283 MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
284 MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
285 MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
286 MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
287 MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
288 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
289 (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
290 MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
291 (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
292 MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
296 #define CALL_DUMMY_START_OFFSET 12
298 /* Insert the specified number of args and function address
299 into a call sequence of the above form stored at DUMMYNAME. */
301 #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
302 (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
303 ((int*)dummyname)[12] |= (unsigned short)(fun))
305 /* Specific information about a procedure.
306 This overlays the MIPS's PDR records,
307 mipsread.c (ab)uses this to save memory */
309 typedef struct mips_extra_func_info
{
310 unsigned long adr
; /* memory address of start of procedure */
311 long isym
; /* pointer to procedure symbol */
312 long pad2
; /* iline: start of line number entries*/
313 long regmask
; /* save register mask */
314 long regoffset
; /* save register offset */
315 long numargs
; /* number of args to procedure (was iopt) */
316 long fregmask
; /* save floating point register mask */
317 long fregoffset
; /* save floating point register offset */
318 long framesize
; /* frameoffset: frame size */
319 short framereg
; /* frame pointer register */
320 short pcreg
; /* offset or reg of return pc */
321 long lnLow
; /* lowest line in the procedure */
322 long lnHigh
; /* highest line in the procedure */
323 long pad3
; /* cbLineOffset: byte offset for this procedure from the fd base */
324 } *mips_extra_func_info_t
;
326 #define EXTRA_FRAME_INFO \
327 char *proc_desc; /* actually, a mips_extra_func_info_t */\
329 struct frame_saved_regs *saved_regs;
331 #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)