src/runtime/sparc-arch.c

   1 /*
   2  * This software is part of the SBCL system. See the README file for
   3  * more information.
   4  *
   5  * This software is derived from the CMU CL system, which was
   6  * written at Carnegie Mellon University and released into the
   7  * public domain. The software is in the public domain and is
   8  * provided with absolutely no warranty. See the COPYING and CREDITS
   9  * files for more information.
  10  */
  11 #include <stdio.h>
  12
  13 #include "sbcl.h"
  14 #include "runtime.h"
  15 #include "arch.h"
  16 #include "globals.h"
  17 #include "validate.h"
  18 #include "os.h"
  19 #include "lispregs.h"
  20 #include "signal.h"
  21 #include "alloc.h"
  22 #include "interrupt.h"
  23 #include "interr.h"
  24 #include "breakpoint.h"
  25 #include "monitor.h"
  26
  27 #ifdef LISP_FEATURE_LINUX
  28 extern int linux_sparc_siginfo_bug;
  29 #endif
  30
  31 void arch_init(void)
  32 {
  33     return;
  34 }
  35
  36 os_vm_address_t arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context)
  37 {
  38     unsigned long badinst;
  39     unsigned long *pc;
  40     int rs1;
  41
  42     pc = (unsigned long *)(*os_context_pc_addr(context));
  43
  44     /* On the sparc, we have to decode the instruction. */
  45
  46     /* Make sure it's not the pc thats bogus, and that it was lisp code */
  47     /* that caused the fault. */
  48     if ((unsigned long) pc & 3) {
  49       /* Unaligned */
  50       return NULL;
  51     }
  52     if ((pc < READ_ONLY_SPACE_START ||
  53          pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
  54         (pc < current_dynamic_space ||
  55          pc >= current_dynamic_space + DYNAMIC_SPACE_SIZE)) {
  56       return NULL;
  57     }
  58
  59     badinst = *pc;
  60
  61     if ((badinst >> 30) != 3)
  62         /* All load/store instructions have op = 11 (binary) */
  63         return 0;
  64
  65     rs1 = (badinst>>14)&0x1f;
  66
  67     if (badinst & (1<<13)) {
  68         /* r[rs1] + simm(13) */
  69         int simm13 = badinst & 0x1fff;
  70
  71         if (simm13 & (1<<12))
  72             simm13 |= -1<<13;
  73
  74         return (os_vm_address_t)
  75             (*os_context_register_addr(context, rs1)+simm13);
  76     }
  77     else {
  78         /* r[rs1] + r[rs2] */
  79         int rs2 = badinst & 0x1f;
  80
  81         return (os_vm_address_t)
  82             (*os_context_register_addr(context, rs1) +
  83              *os_context_register_addr(context, rs2));
  84     }
  85 }
  86
  87 void arch_skip_instruction(os_context_t *context)
  88 {
  89     ((char *) *os_context_pc_addr(context)) = ((char *) *os_context_npc_addr(context));
  90     ((char *) *os_context_npc_addr(context)) += 4;
  91 }
  92
  93 unsigned char *arch_internal_error_arguments(os_context_t *context)
  94 {
  95     return (unsigned char *)(*os_context_pc_addr(context) + 4);
  96 }
  97
  98 boolean arch_pseudo_atomic_atomic(os_context_t *context)
  99 {
 100     return ((*os_context_register_addr(context,reg_ALLOC)) & 4);
 101 }
 102
 103 void arch_set_pseudo_atomic_interrupted(os_context_t *context)
 104 {
 105     *os_context_register_addr(context,reg_ALLOC) |=  1;
 106 }
 107
 108 unsigned long arch_install_breakpoint(void *pc)
 109 {
 110     unsigned long *ptr = (unsigned long *)pc;
 111     unsigned long result = *ptr;
 112     *ptr = trap_Breakpoint;
 113
 114     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
 115
 116     return result;
 117 }
 118
 119 void arch_remove_breakpoint(void *pc, unsigned long orig_inst)
 120 {
 121     *(unsigned long *)pc = orig_inst;
 122     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
 123 }
 124
 125 static unsigned long *skipped_break_addr, displaced_after_inst;
 126 static sigset_t orig_sigmask;
 127
 128 void arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
 129 {
 130     unsigned long *pc = (unsigned long *)(*os_context_pc_addr(context));
 131     unsigned long *npc = (unsigned long *)(*os_context_npc_addr(context));
 132
 133   /*  orig_sigmask = context->sigmask;
 134       sigemptyset(&context->sigmask); */
 135   /* FIXME!!! */
 136   /* FILLBLOCKSET(&context->uc_sigmask);*/
 137
 138     *pc = orig_inst;
 139     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned long));
 140     skipped_break_addr = pc;
 141     displaced_after_inst = *npc;
 142     *npc = trap_AfterBreakpoint;
 143     os_flush_icache((os_vm_address_t) npc, sizeof(unsigned long));
 144
 145 }
 146
 147 static int pseudo_atomic_trap_p(os_context_t *context)
 148 {
 149     unsigned int* pc;
 150     unsigned int badinst;
 151     int result;
 152
 153
 154     pc = (unsigned int*) *os_context_pc_addr(context);
 155     badinst = *pc;
 156     result = 0;
 157
 158     /* Check to see if the current instruction is a pseudo-atomic-trap */
 159     if (((badinst >> 30) == 2) && (((badinst >> 19) & 0x3f) == 0x3a)
 160         && (((badinst >> 13) & 1) == 1) && ((badinst & 0x7f) == PSEUDO_ATOMIC_TRAP))
 161         {
 162             unsigned int previnst;
 163             previnst = pc[-1];
 164             /*
 165              * Check to see if the previous instruction was an andcc alloc-tn,
 166              * 3, zero-tn instruction.
 167              */
 168             if (((previnst >> 30) == 2) && (((previnst >> 19) & 0x3f) == 0x11)
 169                 && (((previnst >> 14) & 0x1f) == reg_ALLOC)
 170                 && (((previnst >> 25) & 0x1f) == reg_ZERO)
 171                 && (((previnst >> 13) & 1) == 1)
 172                 && ((previnst & 0x1fff) == 3))
 173                 {
 174                     result = 1;
 175                 }
 176             else
 177                 {
 178                     fprintf(stderr, "Oops!  Got a PSEUDO-ATOMIC-TRAP without a preceeding andcc!\n");
 179                 }
 180         }
 181     return result;
 182 }
 183
 184 static void sigill_handler(int signal, siginfo_t *siginfo, void *void_context)
 185 {
 186     os_context_t *context = arch_os_get_context(&void_context);
 187 #ifdef LISP_FEATURE_LINUX
 188     /* FIXME: Check that this is necessary -- CSR, 2002-07-15 */
 189     os_restore_fp_control(context);
 190 #endif
 191
 192     if ((siginfo->si_code) == ILL_ILLOPC
 193 #ifdef LISP_FEATURE_LINUX
 194         || (linux_sparc_siginfo_bug && (siginfo->si_code == 2))
 195 #endif
 196         ) {
 197         int trap;
 198         unsigned int inst;
 199         unsigned int* pc = (unsigned int*) siginfo->si_addr;
 200
 201         inst = *pc;
 202         trap = inst & 0x3fffff;
 203
 204         switch (trap) {
 205         case trap_PendingInterrupt:
 206             arch_skip_instruction(context);
 207             interrupt_handle_pending(context);
 208             break;
 209
 210         case trap_Halt:
 211             fake_foreign_function_call(context);
 212             lose("%%primitive halt called; the party is over.\n");
 213
 214         case trap_Error:
 215         case trap_Cerror:
 216             interrupt_internal_error(signal, siginfo, context, trap == trap_Cerror);
 217             break;
 218
 219         case trap_Breakpoint:
 220             handle_breakpoint(signal, siginfo, context);
 221             break;
 222
 223         case trap_FunEndBreakpoint:
 224             *os_context_pc_addr(context) = (int) handle_fun_end_breakpoint(signal, siginfo, context);
 225             *os_context_npc_addr(context) = *os_context_pc_addr(context) + 4;
 226             break;
 227
 228         case trap_AfterBreakpoint:
 229             *skipped_break_addr = trap_Breakpoint;
 230             skipped_break_addr = NULL;
 231             *(unsigned long *) os_context_pc_addr(context) = displaced_after_inst;
 232             /* context->sigmask = orig_sigmask; */
 233             os_flush_icache((os_vm_address_t) os_context_pc_addr(context), sizeof(unsigned long));
 234             break;
 235
 236         default:
 237             interrupt_handle_now(signal, siginfo, context);
 238             break;
 239         }
 240     }
 241     else if ((siginfo->si_code) == ILL_ILLTRP
 242 #ifdef LISP_FEATURE_LINUX
 243              || (linux_sparc_siginfo_bug && (siginfo->si_code) == 192)
 244 #endif
 245              ) {
 246         if (pseudo_atomic_trap_p(context)) {
 247             /* A trap instruction from a pseudo-atomic.  We just need
 248                to fixup up alloc-tn to remove the interrupted flag,
 249                skip over the trap instruction, and then handle the
 250                pending interrupt(s). */
 251             *os_context_register_addr(context, reg_ALLOC) &= ~7;
 252             arch_skip_instruction(context);
 253             interrupt_handle_pending(context);
 254         }
 255         else {
 256             interrupt_internal_error(signal, siginfo, context, 0);
 257         }
 258     }
 259     else {
 260         interrupt_handle_now(signal, siginfo, context);
 261     }
 262 }
 263
 264 static void sigemt_handler(int signal, siginfo_t *siginfo, void *void_context)
 265 {
 266     unsigned long badinst;
 267     boolean subtract, immed;
 268     int rd, rs1, op1, rs2, op2, result;
 269     os_context_t *context = arch_os_get_context(&void_context);
 270 #ifdef LISP_FEATURE_LINUX
 271     os_restore_fp_control(context);
 272 #endif
 273
 274     badinst = *(unsigned long *)os_context_pc_addr(context);
 275     if ((badinst >> 30) != 2 || ((badinst >> 20) & 0x1f) != 0x11) {
 276         /* It wasn't a tagged add.  Pass the signal into lisp. */
 277         interrupt_handle_now(signal, siginfo, context);
 278         return;
 279     }
 280
 281     fprintf(stderr, "SIGEMT trap handler with tagged op instruction!\n");
 282
 283     /* Extract the parts of the inst. */
 284     subtract = badinst & (1<<19);
 285     rs1 = (badinst>>14) & 0x1f;
 286     op1 = *os_context_register_addr(context, rs1);
 287
 288     /* If the first arg is $ALLOC then it is really a signal-pending note */
 289     /* for the pseudo-atomic noise. */
 290     if (rs1 == reg_ALLOC) {
 291         /* Perform the op anyway. */
 292         op2 = badinst & 0x1fff;
 293         if (op2 & (1<<12))
 294             op2 |= -1<<13;
 295         if (subtract)
 296             result = op1 - op2;
 297         else
 298             result = op1 + op2;
 299         *os_context_register_addr(context, reg_ALLOC) = result & ~7;
 300         arch_skip_instruction(context);
 301         interrupt_handle_pending(context);
 302         return;
 303     }
 304
 305     if ((op1 & 3) != 0) {
 306         /* The first arg wan't a fixnum. */
 307         interrupt_internal_error(signal, siginfo, context, 0);
 308         return;
 309     }
 310
 311     if (immed = badinst & (1<<13)) {
 312         op2 = badinst & 0x1fff;
 313         if (op2 & (1<<12))
 314             op2 |= -1<<13;
 315     }
 316     else {
 317         rs2 = badinst & 0x1f;
 318         op2 = *os_context_register_addr(context, rs2);
 319     }
 320
 321     if ((op2 & 3) != 0) {
 322         /* The second arg wan't a fixnum. */
 323         interrupt_internal_error(signal, siginfo, context, 0);
 324         return;
 325     }
 326
 327     rd = (badinst>>25) & 0x1f;
 328     if (rd != 0) {
 329         /* Don't bother computing the result unless we are going to use it. */
 330         if (subtract)
 331             result = (op1>>2) - (op2>>2);
 332         else
 333             result = (op1>>2) + (op2>>2);
 334
 335         dynamic_space_free_pointer =
 336             (lispobj *) *os_context_register_addr(context, reg_ALLOC);
 337
 338         *os_context_register_addr(context, rd) = alloc_number(result);
 339
 340         *os_context_register_addr(context, reg_ALLOC) =
 341             (unsigned long) dynamic_space_free_pointer;
 342     }
 343
 344     arch_skip_instruction(context);
 345 }
 346
 347 void arch_install_interrupt_handlers()
 348 {
 349     undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
 350     undoably_install_low_level_interrupt_handler(SIGEMT, sigemt_handler);
 351 }
 352
 353 \f
 354 extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
 355
 356 lispobj funcall0(lispobj function)
 357 {
 358     lispobj *args = current_control_stack_pointer;
 359
 360     return call_into_lisp(function, args, 0);
 361 }
 362
 363 lispobj funcall1(lispobj function, lispobj arg0)
 364 {
 365     lispobj *args = current_control_stack_pointer;
 366
 367     current_control_stack_pointer += 1;
 368     args[0] = arg0;
 369
 370     return call_into_lisp(function, args, 1);
 371 }
 372
 373 lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1)
 374 {
 375     lispobj *args = current_control_stack_pointer;
 376
 377     current_control_stack_pointer += 2;
 378     args[0] = arg0;
 379     args[1] = arg1;
 380
 381     return call_into_lisp(function, args, 2);
 382 }
 383
 384 lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
 385 {
 386     lispobj *args = current_control_stack_pointer;
 387
 388     current_control_stack_pointer += 3;
 389     args[0] = arg0;
 390     args[1] = arg1;
 391     args[2] = arg2;
 392
 393     return call_into_lisp(function, args, 3);
 394 }
 395
 396 #ifdef LISP_FEATURE_LINKAGE_TABLE
 397
 398 /* This a naive port from CMUCL/sparc, which was mostly stolen from the
 399  * CMUCL/x86 version, with adjustments for sparc
 400  *
 401  * Linkage entry size is 16, because we need at least 3 instruction to
 402  * implement a jump:
 403  *
 404  *      sethi %hi(addr), %g4
 405  *      jmpl  [%g4 + %lo(addr)], %g5
 406  *      nop
 407  *
 408  * The Sparc V9 ABI seems to use 8 words for its jump tables.  Maybe
 409  * we should do the same?
 410  */
 411
 412 /*
 413  * Define the registers to use in the linkage jump table. Can be the
 414  * same. Some care must be exercised when choosing these. It has to be
 415  * a register that is not otherwise being used. reg_L0 is a good
 416  * choice. call_into_c trashes reg_L0 without preserving it, so we can
 417  * trash it in the linkage jump table.
 418  */
 419 #define LINKAGE_TEMP_REG        reg_L0
 420 #define LINKAGE_ADDR_REG        reg_L0
 421
 422 /*
 423  * Insert the necessary jump instructions at the given address.
 424  */
 425 void
 426 arch_write_linkage_table_jmp(void* reloc_addr, void *target_addr)
 427 {
 428   /*
 429    * Make JMP to function entry.
 430    *
 431    * The instruction sequence is:
 432    *
 433    *        sethi %hi(addr), temp_reg
 434    *        jmp   %temp_reg + %lo(addr), %addr_reg
 435    *        nop
 436    *        nop
 437    *
 438    */
 439   int* inst_ptr;
 440   unsigned long hi;                   /* Top 22 bits of address */
 441   unsigned long lo;                   /* Low 10 bits of address */
 442   unsigned int inst;
 443
 444   inst_ptr = (int*) reloc_addr;
 445
 446   /*
 447    * Split the target address into hi and lo parts for the sethi
 448    * instruction.  hi is the top 22 bits.  lo is the low 10 bits.
 449    */
 450   hi = (unsigned long) target_addr;
 451   lo = hi & 0x3ff;
 452   hi >>= 10;
 453
 454   /*
 455    * sethi %hi(addr), temp_reg
 456    */
 457
 458   inst = (0 << 30) | (LINKAGE_TEMP_REG << 25) | (4 << 22) | hi;
 459   *inst_ptr++ = inst;
 460
 461   /*
 462    * jmpl [temp_reg + %lo(addr)], addr_reg
 463    */
 464
 465   inst = (2U << 30) | (LINKAGE_ADDR_REG << 25) | (0x38 << 19)
 466     | (LINKAGE_TEMP_REG << 14) | (1 << 13) | lo;
 467   *inst_ptr++ = inst;
 468
 469   /* nop (really sethi 0, %g0) */
 470
 471   inst = (0 << 30) | (0 << 25) | (4 << 22) | 0;
 472
 473   *inst_ptr++ = inst;
 474   *inst_ptr++ = inst;
 475
 476   os_flush_icache((os_vm_address_t) reloc_addr, (char*) inst_ptr - (char*) reloc_addr);
 477 }
 478
 479 void
 480 arch_write_linkage_table_ref(void * reloc_addr, void *target_addr)
 481 {
 482     *(unsigned long *)reloc_addr = (unsigned long)target_addr;
 483 }
 484
 485 #endif