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 int badinst;
  39     unsigned int *pc;
  40     int rs1;
  41
  42     pc = (unsigned int *)(*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 void arch_clear_pseudo_atomic_interrupted(os_context_t *context)
 109 {
 110     *os_context_register_addr(context,reg_ALLOC) &= ~1;
 111 }
 112
 113 unsigned int arch_install_breakpoint(void *pc)
 114 {
 115     unsigned int *ptr = (unsigned int *)pc;
 116     unsigned int result = *ptr;
 117     *ptr = trap_Breakpoint;
 118
 119     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
 120
 121     return result;
 122 }
 123
 124 void arch_remove_breakpoint(void *pc, unsigned int orig_inst)
 125 {
 126     *(unsigned int *)pc = orig_inst;
 127     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
 128 }
 129
 130 /*
 131  * Perform the instruction that we overwrote with a breakpoint.  As we
 132  * don't have a single-step facility, this means we have to:
 133  * - put the instruction back
 134  * - put a second breakpoint at the following instruction,
 135  *   set after_breakpoint and continue execution.
 136  *
 137  * When the second breakpoint is hit (very shortly thereafter, we hope)
 138  * sigtrap_handler gets called again, but follows the AfterBreakpoint
 139  * arm, which
 140  * - puts a bpt back in the first breakpoint place (running across a
 141  *   breakpoint shouldn't cause it to be uninstalled)
 142  * - replaces the second bpt with the instruction it was meant to be
 143  * - carries on
 144  *
 145  * Clear?
 146  */
 147 static unsigned int *skipped_break_addr, displaced_after_inst;
 148 static sigset_t orig_sigmask;
 149
 150 void arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
 151 {
 152     unsigned int *pc = (unsigned int *)(*os_context_pc_addr(context));
 153     unsigned int *npc = (unsigned int *)(*os_context_npc_addr(context));
 154
 155   /*  orig_sigmask = context->sigmask;
 156       sigemptyset(&context->sigmask); */
 157   /* FIXME!!! */
 158   /* FILLBLOCKSET(&context->uc_sigmask);*/
 159
 160     *pc = orig_inst;
 161     os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
 162     skipped_break_addr = pc;
 163     displaced_after_inst = *npc;
 164     *npc = trap_AfterBreakpoint;
 165     os_flush_icache((os_vm_address_t) npc, sizeof(unsigned int));
 166
 167 }
 168
 169 static int pseudo_atomic_trap_p(os_context_t *context)
 170 {
 171     unsigned int* pc;
 172     unsigned int badinst;
 173     int result;
 174
 175
 176     pc = (unsigned int*) *os_context_pc_addr(context);
 177     badinst = *pc;
 178     result = 0;
 179
 180     /* Check to see if the current instruction is a pseudo-atomic-trap */
 181     if (((badinst >> 30) == 2) && (((badinst >> 19) & 0x3f) == 0x3a)
 182         && (((badinst >> 13) & 1) == 1) && ((badinst & 0x7f) == PSEUDO_ATOMIC_TRAP))
 183         {
 184             unsigned int previnst;
 185             previnst = pc[-1];
 186             /*
 187              * Check to see if the previous instruction was an andcc alloc-tn,
 188              * 3, zero-tn instruction.
 189              */
 190             if (((previnst >> 30) == 2) && (((previnst >> 19) & 0x3f) == 0x11)
 191                 && (((previnst >> 14) & 0x1f) == reg_ALLOC)
 192                 && (((previnst >> 25) & 0x1f) == reg_ZERO)
 193                 && (((previnst >> 13) & 1) == 1)
 194                 && ((previnst & 0x1fff) == 3))
 195                 {
 196                     result = 1;
 197                 }
 198             else
 199                 {
 200                     fprintf(stderr, "Oops!  Got a PSEUDO-ATOMIC-TRAP without a preceeding andcc!\n");
 201                 }
 202         }
 203     return result;
 204 }
 205
 206 static void sigill_handler(int signal, siginfo_t *siginfo, void *void_context)
 207 {
 208     os_context_t *context = arch_os_get_context(&void_context);
 209 #ifdef LISP_FEATURE_LINUX
 210     /* FIXME: Check that this is necessary -- CSR, 2002-07-15 */
 211     os_restore_fp_control(context);
 212 #endif
 213
 214     if ((siginfo->si_code) == ILL_ILLOPC
 215 #ifdef LISP_FEATURE_LINUX
 216         || (linux_sparc_siginfo_bug && (siginfo->si_code == 2))
 217 #endif
 218         ) {
 219         int trap;
 220         unsigned int inst;
 221         unsigned int* pc = (unsigned int*) siginfo->si_addr;
 222
 223         inst = *pc;
 224         trap = inst & 0x3fffff;
 225
 226         switch (trap) {
 227         case trap_PendingInterrupt:
 228             arch_skip_instruction(context);
 229             interrupt_handle_pending(context);
 230             break;
 231
 232         case trap_Halt:
 233             fake_foreign_function_call(context);
 234             lose("%%primitive halt called; the party is over.\n");
 235
 236         case trap_Error:
 237         case trap_Cerror:
 238             interrupt_internal_error(signal, siginfo, context, trap == trap_Cerror);
 239             break;
 240
 241         case trap_Breakpoint:
 242             handle_breakpoint(signal, siginfo, context);
 243             break;
 244
 245         case trap_FunEndBreakpoint:
 246             *os_context_pc_addr(context) = (int) handle_fun_end_breakpoint(signal, siginfo, context);
 247             *os_context_npc_addr(context) = *os_context_pc_addr(context) + 4;
 248             break;
 249
 250         case trap_AfterBreakpoint:
 251             *skipped_break_addr = trap_Breakpoint;
 252             os_flush_icache(skipped_break_addr, sizeof(unsigned int));
 253             skipped_break_addr = NULL;
 254             *(unsigned long *) os_context_pc_addr(context) = displaced_after_inst;
 255             /* context->sigmask = orig_sigmask; */
 256             os_flush_icache((os_vm_address_t) os_context_pc_addr(context), sizeof(unsigned int));
 257             break;
 258
 259         default:
 260             interrupt_handle_now(signal, siginfo, context);
 261             break;
 262         }
 263     }
 264     else if ((siginfo->si_code) == ILL_ILLTRP
 265 #ifdef LISP_FEATURE_LINUX
 266              || (linux_sparc_siginfo_bug && (siginfo->si_code) == 192)
 267 #endif
 268              ) {
 269         if (pseudo_atomic_trap_p(context)) {
 270             /* A trap instruction from a pseudo-atomic.  We just need
 271                to fixup up alloc-tn to remove the interrupted flag,
 272                skip over the trap instruction, and then handle the
 273                pending interrupt(s). */
 274             arch_clear_pseudo_atomic_interrupted(context);
 275             arch_skip_instruction(context);
 276             interrupt_handle_pending(context);
 277         }
 278         else {
 279             interrupt_internal_error(signal, siginfo, context, 0);
 280         }
 281     }
 282     else {
 283         interrupt_handle_now(signal, siginfo, context);
 284     }
 285 }
 286
 287 static void sigemt_handler(int signal, siginfo_t *siginfo, void *void_context)
 288 {
 289     unsigned int badinst;
 290     boolean subtract, immed;
 291     int rd, rs1, op1, rs2, op2, result;
 292     os_context_t *context = arch_os_get_context(&void_context);
 293 #ifdef LISP_FEATURE_LINUX
 294     os_restore_fp_control(context);
 295 #endif
 296
 297     badinst = *(unsigned int *)os_context_pc_addr(context);
 298     if ((badinst >> 30) != 2 || ((badinst >> 20) & 0x1f) != 0x11) {
 299         /* It wasn't a tagged add.  Pass the signal into lisp. */
 300         interrupt_handle_now(signal, siginfo, context);
 301         return;
 302     }
 303
 304     fprintf(stderr, "SIGEMT trap handler with tagged op instruction!\n");
 305
 306     /* Extract the parts of the inst. */
 307     subtract = badinst & (1<<19);
 308     rs1 = (badinst>>14) & 0x1f;
 309     op1 = *os_context_register_addr(context, rs1);
 310
 311     /* If the first arg is $ALLOC then it is really a signal-pending note */
 312     /* for the pseudo-atomic noise. */
 313     if (rs1 == reg_ALLOC) {
 314         /* Perform the op anyway. */
 315         op2 = badinst & 0x1fff;
 316         if (op2 & (1<<12))
 317             op2 |= -1<<13;
 318         if (subtract)
 319             result = op1 - op2;
 320         else
 321             result = op1 + op2;
 322         /* KLUDGE: this & ~7 is a little bit magical but basically
 323            clears pseudo_atomic bits if any */
 324         *os_context_register_addr(context, reg_ALLOC) = result & ~7;
 325         arch_skip_instruction(context);
 326         interrupt_handle_pending(context);
 327         return;
 328     }
 329
 330     if ((op1 & 3) != 0) {
 331         /* The first arg wan't a fixnum. */
 332         interrupt_internal_error(signal, siginfo, context, 0);
 333         return;
 334     }
 335
 336     if (immed = badinst & (1<<13)) {
 337         op2 = badinst & 0x1fff;
 338         if (op2 & (1<<12))
 339             op2 |= -1<<13;
 340     }
 341     else {
 342         rs2 = badinst & 0x1f;
 343         op2 = *os_context_register_addr(context, rs2);
 344     }
 345
 346     if ((op2 & 3) != 0) {
 347         /* The second arg wan't a fixnum. */
 348         interrupt_internal_error(signal, siginfo, context, 0);
 349         return;
 350     }
 351
 352     rd = (badinst>>25) & 0x1f;
 353     if (rd != 0) {
 354         /* Don't bother computing the result unless we are going to use it. */
 355         if (subtract)
 356             result = (op1>>2) - (op2>>2);
 357         else
 358             result = (op1>>2) + (op2>>2);
 359
 360         dynamic_space_free_pointer =
 361             (lispobj *) *os_context_register_addr(context, reg_ALLOC);
 362
 363         *os_context_register_addr(context, rd) = alloc_number(result);
 364
 365         *os_context_register_addr(context, reg_ALLOC) =
 366             (unsigned long) dynamic_space_free_pointer;
 367     }
 368
 369     arch_skip_instruction(context);
 370 }
 371
 372 void arch_install_interrupt_handlers()
 373 {
 374     undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler);
 375     undoably_install_low_level_interrupt_handler(SIGEMT, sigemt_handler);
 376 }
 377
 378 \f
 379 extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
 380
 381 lispobj funcall0(lispobj function)
 382 {
 383     lispobj *args = current_control_stack_pointer;
 384
 385     return call_into_lisp(function, args, 0);
 386 }
 387
 388 lispobj funcall1(lispobj function, lispobj arg0)
 389 {
 390     lispobj *args = current_control_stack_pointer;
 391
 392     current_control_stack_pointer += 1;
 393     args[0] = arg0;
 394
 395     return call_into_lisp(function, args, 1);
 396 }
 397
 398 lispobj funcall2(lispobj function, lispobj arg0, lispobj arg1)
 399 {
 400     lispobj *args = current_control_stack_pointer;
 401
 402     current_control_stack_pointer += 2;
 403     args[0] = arg0;
 404     args[1] = arg1;
 405
 406     return call_into_lisp(function, args, 2);
 407 }
 408
 409 lispobj funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2)
 410 {
 411     lispobj *args = current_control_stack_pointer;
 412
 413     current_control_stack_pointer += 3;
 414     args[0] = arg0;
 415     args[1] = arg1;
 416     args[2] = arg2;
 417
 418     return call_into_lisp(function, args, 3);
 419 }
 420
 421 #ifdef LISP_FEATURE_LINKAGE_TABLE
 422
 423 /* This a naive port from CMUCL/sparc, which was mostly stolen from the
 424  * CMUCL/x86 version, with adjustments for sparc
 425  *
 426  * Linkage entry size is 16, because we need at least 3 instruction to
 427  * implement a jump:
 428  *
 429  *      sethi %hi(addr), %g4
 430  *      jmpl  [%g4 + %lo(addr)], %g5
 431  *      nop
 432  *
 433  * The Sparc V9 ABI seems to use 8 words for its jump tables.  Maybe
 434  * we should do the same?
 435  */
 436
 437 /*
 438  * Define the registers to use in the linkage jump table. Can be the
 439  * same. Some care must be exercised when choosing these. It has to be
 440  * a register that is not otherwise being used. reg_L0 is a good
 441  * choice. call_into_c trashes reg_L0 without preserving it, so we can
 442  * trash it in the linkage jump table.
 443  */
 444 #define LINKAGE_TEMP_REG        reg_L0
 445 #define LINKAGE_ADDR_REG        reg_L0
 446
 447 /*
 448  * Insert the necessary jump instructions at the given address.
 449  */
 450 void
 451 arch_write_linkage_table_jmp(void* reloc_addr, void *target_addr)
 452 {
 453   /*
 454    * Make JMP to function entry.
 455    *
 456    * The instruction sequence is:
 457    *
 458    *        sethi %hi(addr), temp_reg
 459    *        jmp   %temp_reg + %lo(addr), %addr_reg
 460    *        nop
 461    *        nop
 462    *
 463    */
 464   int* inst_ptr;
 465   unsigned long hi;                   /* Top 22 bits of address */
 466   unsigned long lo;                   /* Low 10 bits of address */
 467   unsigned int inst;
 468
 469   inst_ptr = (int*) reloc_addr;
 470
 471   /*
 472    * Split the target address into hi and lo parts for the sethi
 473    * instruction.  hi is the top 22 bits.  lo is the low 10 bits.
 474    */
 475   hi = (unsigned long) target_addr;
 476   lo = hi & 0x3ff;
 477   hi >>= 10;
 478
 479   /*
 480    * sethi %hi(addr), temp_reg
 481    */
 482
 483   inst = (0 << 30) | (LINKAGE_TEMP_REG << 25) | (4 << 22) | hi;
 484   *inst_ptr++ = inst;
 485
 486   /*
 487    * jmpl [temp_reg + %lo(addr)], addr_reg
 488    */
 489
 490   inst = (2U << 30) | (LINKAGE_ADDR_REG << 25) | (0x38 << 19)
 491     | (LINKAGE_TEMP_REG << 14) | (1 << 13) | lo;
 492   *inst_ptr++ = inst;
 493
 494   /* nop (really sethi 0, %g0) */
 495
 496   inst = (0 << 30) | (0 << 25) | (4 << 22) | 0;
 497
 498   *inst_ptr++ = inst;
 499   *inst_ptr++ = inst;
 500
 501   os_flush_icache((os_vm_address_t) reloc_addr, (char*) inst_ptr - (char*) reloc_addr);
 502 }
 503
 504 void
 505 arch_write_linkage_table_ref(void * reloc_addr, void *target_addr)
 506 {
 507     *(unsigned long *)reloc_addr = (unsigned long)target_addr;
 508 }
 509
 510 #endif