| 1 | /* Target machine description for SGI Iris under Irix, for GDB. |
| 2 | Copyright 1990, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 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. |
| 10 | |
| 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. |
| 15 | |
| 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. */ |
| 19 | |
| 20 | #include "coff/sym.h" /* Needed for PDR below. */ |
| 21 | #include "coff/symconst.h" |
| 22 | |
| 23 | #define TARGET_BYTE_ORDER BIG_ENDIAN |
| 24 | |
| 25 | /* Floating point is IEEE compliant */ |
| 26 | #define IEEE_FLOAT |
| 27 | |
| 28 | /* Define this if the C compiler puts an underscore at the front |
| 29 | of external names before giving them to the linker. */ |
| 30 | |
| 31 | /*#define NAMES_HAVE_UNDERSCORE*/ |
| 32 | |
| 33 | /* SGI's assembler doesn't grok dollar signs in identifiers. |
| 34 | So we use dots instead. This item must be coordinated with G++. */ |
| 35 | #undef CPLUS_MARKER |
| 36 | #define CPLUS_MARKER '.' |
| 37 | |
| 38 | /* Offset from address of function to start of its code. |
| 39 | Zero on most machines. */ |
| 40 | |
| 41 | #define FUNCTION_START_OFFSET 0 |
| 42 | |
| 43 | /* Advance PC across any function entry prologue instructions |
| 44 | to reach some "real" code. */ |
| 45 | |
| 46 | #define SKIP_PROLOGUE(pc) pc = mips_skip_prologue(pc) |
| 47 | |
| 48 | /* Immediately after a function call, return the saved pc. |
| 49 | Can't always go through the frames for this because on some machines |
| 50 | the new frame is not set up until the new function executes |
| 51 | some instructions. */ |
| 52 | |
| 53 | #define SAVED_PC_AFTER_CALL(frame) read_register(RA_REGNUM) |
| 54 | |
| 55 | /* Are we currently handling a signal */ |
| 56 | |
| 57 | #define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name) |
| 58 | |
| 59 | /* Address of end of stack space. */ |
| 60 | |
| 61 | #define STACK_END_ADDR (0x7ffff000) |
| 62 | |
| 63 | /* Stack grows downward. */ |
| 64 | |
| 65 | #define INNER_THAN < |
| 66 | |
| 67 | #define BREAKPOINT {0, 0x5, 0, 0xd} |
| 68 | |
| 69 | /* Amount PC must be decremented by after a breakpoint. |
| 70 | This is often the number of bytes in BREAKPOINT |
| 71 | but not always. */ |
| 72 | |
| 73 | #define DECR_PC_AFTER_BREAK 0 |
| 74 | |
| 75 | /* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */ |
| 76 | |
| 77 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008) |
| 78 | |
| 79 | /* Return 1 if P points to an invalid floating point value. */ |
| 80 | |
| 81 | #define INVALID_FLOAT(p,l) isa_NAN(p,l) |
| 82 | |
| 83 | /* Say how long (all) registers are. */ |
| 84 | |
| 85 | #define REGISTER_TYPE long |
| 86 | |
| 87 | /* Number of machine registers */ |
| 88 | |
| 89 | #define NUM_REGS 71 |
| 90 | |
| 91 | /* Initializer for an array of names of registers. |
| 92 | There should be NUM_REGS strings in this initializer. */ |
| 93 | |
| 94 | #define REGISTER_NAMES \ |
| 95 | { "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \ |
| 96 | "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \ |
| 97 | "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \ |
| 98 | "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra", \ |
| 99 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ |
| 100 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ |
| 101 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\ |
| 102 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\ |
| 103 | "pc", "cause", "bad", "hi", "lo", "fsr", "fir" \ |
| 104 | } |
| 105 | |
| 106 | /* Register numbers of various important registers. |
| 107 | Note that some of these values are "real" register numbers, |
| 108 | and correspond to the general registers of the machine, |
| 109 | and some are "phony" register numbers which are too large |
| 110 | to be actual register numbers as far as the user is concerned |
| 111 | but do serve to get the desired values when passed to read_register. */ |
| 112 | |
| 113 | #define A0_REGNUM 4 /* Loc of first arg during a subr call */ |
| 114 | #define SP_REGNUM 29 /* Contains address of top of stack */ |
| 115 | #define FP_REGNUM 30 /* Pseudo register that contains true address of executing stack frame */ |
| 116 | #define RA_REGNUM 31 /* Contains return address value */ |
| 117 | #define FP0_REGNUM 32 /* Floating point register 0 (single float) */ |
| 118 | #define PC_REGNUM 64 /* Contains program counter */ |
| 119 | #define PS_REGNUM 65 /* Contains processor status */ |
| 120 | #define HI_REGNUM 67 /* Multiple/divide temp */ |
| 121 | #define LO_REGNUM 68 /* ... */ |
| 122 | #define FCRCS_REGNUM 69 /* FP control/status */ |
| 123 | #define FCRIR_REGNUM 70 /* FP implementation/revision */ |
| 124 | |
| 125 | /* Define DO_REGISTERS_INFO() to do machine-specific formatting |
| 126 | of register dumps. */ |
| 127 | |
| 128 | #define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp) |
| 129 | |
| 130 | /* Total amount of space needed to store our copies of the machine's |
| 131 | register state, the array `registers'. */ |
| 132 | #define REGISTER_BYTES (NUM_REGS*4) |
| 133 | |
| 134 | /* Index within `registers' of the first byte of the space for |
| 135 | register N. */ |
| 136 | |
| 137 | #define REGISTER_BYTE(N) ((N) * 4) |
| 138 | |
| 139 | /* Number of bytes of storage in the actual machine representation |
| 140 | for register N. On mips, all regs are 4 bytes. */ |
| 141 | |
| 142 | #define REGISTER_RAW_SIZE(N) 4 |
| 143 | |
| 144 | /* Number of bytes of storage in the program's representation |
| 145 | for register N. On mips, all regs are 4 bytes. */ |
| 146 | |
| 147 | #define REGISTER_VIRTUAL_SIZE(N) 4 |
| 148 | |
| 149 | /* Largest value REGISTER_RAW_SIZE can have. */ |
| 150 | |
| 151 | #define MAX_REGISTER_RAW_SIZE 4 |
| 152 | |
| 153 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
| 154 | |
| 155 | #define MAX_REGISTER_VIRTUAL_SIZE 4 |
| 156 | |
| 157 | /* Nonzero if register N requires conversion |
| 158 | from raw format to virtual format. */ |
| 159 | |
| 160 | #define REGISTER_CONVERTIBLE(N) 0 |
| 161 | |
| 162 | /* Convert data from raw format for register REGNUM |
| 163 | to virtual format for register REGNUM. */ |
| 164 | |
| 165 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
| 166 | bcopy ((FROM), (TO), 4); |
| 167 | |
| 168 | /* Convert data from virtual format for register REGNUM |
| 169 | to raw format for register REGNUM. */ |
| 170 | |
| 171 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
| 172 | bcopy ((FROM), (TO), 4); |
| 173 | |
| 174 | /* Return the GDB type object for the "standard" data type |
| 175 | of data in register N. */ |
| 176 | |
| 177 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_int |
| 178 | /* Store the address of the place in which to copy the structure the |
| 179 | subroutine will return. This is called from call_function. */ |
| 180 | |
| 181 | #define STORE_STRUCT_RETURN(addr, sp) \ |
| 182 | { sp = push_word(sp, addr);} |
| 183 | |
| 184 | /* Extract from an array REGBUF containing the (raw) register state |
| 185 | a function return value of type TYPE, and copy that, in virtual format, |
| 186 | into VALBUF. XXX floats */ |
| 187 | |
| 188 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
| 189 | bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE)) |
| 190 | |
| 191 | /* Write into appropriate registers a function return value |
| 192 | of type TYPE, given in virtual format. */ |
| 193 | |
| 194 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
| 195 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), VALBUF, TYPE_LENGTH (TYPE)) |
| 196 | |
| 197 | /* Extract from an array REGBUF containing the (raw) register state |
| 198 | the address in which a function should return its structure value, |
| 199 | as a CORE_ADDR (or an expression that can be used as one). */ |
| 200 | |
| 201 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF+16)) |
| 202 | |
| 203 | /* Structures are returned by ref in extra arg0 */ |
| 204 | #define USE_STRUCT_CONVENTION(gcc_p, type) 1 |
| 205 | |
| 206 | \f |
| 207 | /* Describe the pointer in each stack frame to the previous stack frame |
| 208 | (its caller). */ |
| 209 | |
| 210 | /* FRAME_CHAIN takes a frame's nominal address |
| 211 | and produces the frame's chain-pointer. */ |
| 212 | |
| 213 | #define FRAME_CHAIN(thisframe) (FRAME_ADDR)mips_frame_chain(thisframe) |
| 214 | |
| 215 | /* Define other aspects of the stack frame. */ |
| 216 | |
| 217 | |
| 218 | /* A macro that tells us whether the function invocation represented |
| 219 | by FI does not have a frame on the stack associated with it. If it |
| 220 | does not, FRAMELESS is set to 1, else 0. */ |
| 221 | /* We handle this differently for mips, and maybe we should not */ |
| 222 | |
| 223 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;} |
| 224 | |
| 225 | /* Saved Pc. */ |
| 226 | |
| 227 | #define FRAME_SAVED_PC(FRAME) (mips_frame_saved_pc(FRAME)) |
| 228 | |
| 229 | #define FRAME_ARGS_ADDRESS(fi) (fi)->frame |
| 230 | |
| 231 | #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame |
| 232 | |
| 233 | /* Return number of args passed to a frame. |
| 234 | Can return -1, meaning no way to tell. */ |
| 235 | |
| 236 | #define FRAME_NUM_ARGS(num, fi) (num = mips_frame_num_args(fi)) |
| 237 | |
| 238 | /* Return number of bytes at start of arglist that are not really args. */ |
| 239 | |
| 240 | #define FRAME_ARGS_SKIP 0 |
| 241 | |
| 242 | /* Put here the code to store, into a struct frame_saved_regs, |
| 243 | the addresses of the saved registers of frame described by FRAME_INFO. |
| 244 | This includes special registers such as pc and fp saved in special |
| 245 | ways in the stack frame. sp is even more special: |
| 246 | the address we return for it IS the sp for the next frame. */ |
| 247 | |
| 248 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) ( \ |
| 249 | (frame_saved_regs) = *(frame_info)->saved_regs, \ |
| 250 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame) |
| 251 | |
| 252 | \f |
| 253 | /* Things needed for making the inferior call functions. */ |
| 254 | |
| 255 | /* Stack has strict alignment. However, use PUSH_ARGUMENTS |
| 256 | to take care of it. */ |
| 257 | /*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/ |
| 258 | |
| 259 | #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \ |
| 260 | sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr) |
| 261 | |
| 262 | /* Push an empty stack frame, to record the current PC, etc. */ |
| 263 | |
| 264 | #define PUSH_DUMMY_FRAME mips_push_dummy_frame() |
| 265 | |
| 266 | /* Discard from the stack the innermost frame, restoring all registers. */ |
| 267 | |
| 268 | #define POP_FRAME mips_pop_frame() |
| 269 | |
| 270 | #define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset)) |
| 271 | #define CALL_DUMMY_SIZE (16*4) |
| 272 | #define Dest_Reg 2 |
| 273 | #define CALL_DUMMY {\ |
| 274 | MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\ |
| 275 | 0, /* nop # ... to stop raw backtrace*/\ |
| 276 | 0x27bd0000, /* addu sp,?0 # Pseudo prologue */\ |
| 277 | /* Start here: */\ |
| 278 | MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\ |
| 279 | MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\ |
| 280 | MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\ |
| 281 | MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\ |
| 282 | MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\ |
| 283 | MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\ |
| 284 | MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\ |
| 285 | MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\ |
| 286 | (017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\ |
| 287 | MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \ |
| 288 | (Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\ |
| 289 | MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\ |
| 290 | 0x5000d, /* bpt */\ |
| 291 | } |
| 292 | |
| 293 | #define CALL_DUMMY_START_OFFSET 12 |
| 294 | |
| 295 | /* Insert the specified number of args and function address |
| 296 | into a call sequence of the above form stored at DUMMYNAME. */ |
| 297 | |
| 298 | #define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\ |
| 299 | (((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \ |
| 300 | ((int*)dummyname)[12] |= (unsigned short)(fun)) |
| 301 | |
| 302 | /* Specific information about a procedure. |
| 303 | This overlays the MIPS's PDR records, |
| 304 | mipsread.c (ab)uses this to save memory */ |
| 305 | |
| 306 | typedef struct mips_extra_func_info { |
| 307 | long numargs; /* number of args to procedure (was iopt) */ |
| 308 | PDR pdr; /* Procedure descriptor record */ |
| 309 | } *mips_extra_func_info_t; |
| 310 | |
| 311 | #define EXTRA_FRAME_INFO \ |
| 312 | mips_extra_func_info_t proc_desc; \ |
| 313 | int num_args;\ |
| 314 | struct frame_saved_regs *saved_regs; |
| 315 | |
| 316 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci) |
| 317 | |
| 318 | /* Size of elements in jmpbuf */ |
| 319 | |
| 320 | #define JB_ELEMENT_SIZE 4 |
| 321 | |
| 322 | /* Figure out where the longjmp will land. We expect that we have just entered |
| 323 | longjmp and haven't yet setup the stack frame, so the args are still in the |
| 324 | argument regs. a0 (CALL_ARG0) points at the jmp_buf structure from which we |
| 325 | extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. |
| 326 | This routine returns true on success */ |
| 327 | |
| 328 | /* Note that caller must #include <setjmp.h> in order to get def of JB_* */ |
| 329 | #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR) |