ghc/rts/StgCRun.c

   1 /* -----------------------------------------------------------------------------
   2  *
   3  * (c) The GHC Team, 1998-2003
   4  *
   5  * STG-to-C glue.
   6  *
   7  * To run an STG function from C land, call
   8  *
   9  *              rv = StgRun(f,BaseReg);
  10  *
  11  * where "f" is the STG function to call, and BaseReg is the address of the
  12  * RegTable for this run (we might have separate RegTables if we're running
  13  * multiple threads on an SMP machine).
  14  *
  15  * In the end, "f" must JMP to StgReturn (defined below),
  16  * passing the return-value "rv" in R1,
  17  * to return to the caller of StgRun returning "rv" in
  18  * the whatever way C returns a value.
  19  *
  20  * NOTE: StgRun/StgReturn do *NOT* load or store Hp or any
  21  * other registers (other than saving the C callee-saves
  22  * registers).  Instead, the called function "f" must do that
  23  * in STG land.
  24  *
  25  * GCC will have assumed that pushing/popping of C-stack frames is
  26  * going on when it generated its code, and used stack space
  27  * accordingly.  However, we actually {\em post-process away} all
  28  * such stack-framery (see \tr{ghc/driver/ghc-asm.lprl}). Things will
  29  * be OK however, if we initially make sure there are
  30  * @RESERVED_C_STACK_BYTES@ on the C-stack to begin with, for local
  31  * variables.
  32  *
  33  * -------------------------------------------------------------------------- */
  34
  35 #include "PosixSource.h"
  36
  37
  38 /*
  39  * We define the following (unused) global register variables, because for
  40  * some reason gcc generates sub-optimal code for StgRun() on the Alpha
  41  * (unnecessarily saving extra registers on the stack) if we don't.
  42  *
  43  * Why do it at the top of this file, rather than near StgRun() below?  Because
  44  * gcc doesn't let us define global register variables after any function
  45  * definition has been read.  Any point after #include "Stg.h" would be too
  46  * late.
  47  *
  48  * We define alpha_EXTRA_CAREFUL here to save $s6, $f8 and $f9 -- registers
  49  * that we don't use but which are callee-save registers.  The __divq() routine
  50  * in libc.a clobbers $s6.
  51  */
  52 #include "ghcconfig.h"
  53 #ifdef alpha_HOST_ARCH
  54 #define alpha_EXTRA_CAREFUL
  55 register long   fake_ra __asm__("$26");
  56 register long   fake_gp __asm__("$29");
  57 #ifdef alpha_EXTRA_CAREFUL
  58 register long   fake_s6 __asm__("$15");
  59 register double fake_f8 __asm__("$f8");
  60 register double fake_f9 __asm__("$f9");
  61 #endif
  62 #endif
  63
  64 /* include Stg.h first because we want real machine regs in here: we
  65  * have to get the value of R1 back from Stg land to C land intact.
  66  */
  67 #include "Stg.h"
  68 #include "Rts.h"
  69 #include "StgRun.h"
  70 #include "RtsFlags.h"
  71 #include "OSThreads.h"
  72 #include "Capability.h"
  73
  74 #ifdef DEBUG
  75 #include "RtsUtils.h"
  76 #include "Printer.h"
  77 #endif
  78
  79 #ifdef USE_MINIINTERPRETER
  80
  81 /* -----------------------------------------------------------------------------
  82    any architecture (using miniinterpreter)
  83    -------------------------------------------------------------------------- */
  84
  85 StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg STG_UNUSED)
  86 {
  87     while (f) {
  88         IF_DEBUG(interpreter,
  89             debugBelch("Jumping to ");
  90             printPtr((P_)f); fflush(stdout);
  91             debugBelch("\n");
  92             );
  93         f = (StgFunPtr) (f)();
  94     }
  95     return (StgRegTable *)R1.p;
  96 }
  97
  98 StgFunPtr StgReturn(void)
  99 {
 100     return 0;
 101 }
 102
 103 #else /* !USE_MINIINTERPRETER */
 104
 105 #ifdef LEADING_UNDERSCORE
 106 #define STG_RETURN "_StgReturn"
 107 #else
 108 #define STG_RETURN "StgReturn"
 109 #endif
 110
 111 /* -----------------------------------------------------------------------------
 112    x86 architecture
 113    -------------------------------------------------------------------------- */
 114
 115 #ifdef i386_HOST_ARCH
 116
 117 #ifdef darwin_TARGET_OS
 118 #define STG_GLOBAL ".globl "
 119 #else
 120 #define STG_GLOBAL ".global "
 121 #endif
 122
 123 StgRegTable *
 124 StgRun(StgFunPtr f, StgRegTable *basereg) {
 125
 126     unsigned char space[ RESERVED_C_STACK_BYTES + 4*sizeof(void *) ];
 127     StgRegTable * r;
 128
 129     __asm__ volatile (
 130         /*
 131          * save callee-saves registers on behalf of the STG code.
 132          */
 133         "movl %%esp, %%eax\n\t"
 134         "addl %4, %%eax\n\t"
 135         "movl %%ebx,0(%%eax)\n\t"
 136         "movl %%esi,4(%%eax)\n\t"
 137         "movl %%edi,8(%%eax)\n\t"
 138         "movl %%ebp,12(%%eax)\n\t"
 139         /*
 140          * Set BaseReg
 141          */
 142         "movl %3,%%ebx\n\t"
 143         /*
 144          * grab the function argument from the stack
 145          */
 146         "movl %2,%%eax\n\t"
 147
 148 #if darwin_TARGET_OS
 149         /*
 150          * Darwin: keep the stack aligned
 151          */
 152         "subl $12,%%esp\n\t"
 153 #endif
 154
 155         /*
 156          * jump to it
 157          */
 158         "jmp *%%eax\n\t"
 159
 160         STG_GLOBAL STG_RETURN "\n"
 161         STG_RETURN ":\n\t"
 162
 163 #if darwin_TARGET_OS
 164         /*
 165          * Darwin: keep the stack aligned
 166          */
 167         "addl $12,%%esp\n\t"
 168 #endif
 169
 170         "movl %%esi, %%eax\n\t"   /* Return value in R1  */
 171
 172         /*
 173          * restore callee-saves registers.  (Don't stomp on %%eax!)
 174          */
 175         "movl %%esp, %%edx\n\t"
 176         "addl %4, %%edx\n\t"
 177         "movl 0(%%edx),%%ebx\n\t"       /* restore the registers saved above */
 178         "movl 4(%%edx),%%esi\n\t"
 179         "movl 8(%%edx),%%edi\n\t"
 180         "movl 12(%%edx),%%ebp\n\t"
 181
 182       : "=&a" (r), "=m" (space)
 183       : "m" (f), "m" (basereg), "i" (RESERVED_C_STACK_BYTES)
 184       : "edx" /* stomps on %edx */
 185     );
 186
 187     return r;
 188 }
 189
 190 #endif
 191
 192 /* ----------------------------------------------------------------------------
 193    x86-64 is almost the same as plain x86.
 194
 195    I've done it using entirely inline assembler, because I couldn't
 196    get gcc to generate the correct subtraction from %rsp by using
 197    the local array variable trick.  It didn't seem to reserve
 198    enough space.  Oh well, it's not much harder this way.
 199
 200    ------------------------------------------------------------------------- */
 201
 202 #ifdef x86_64_HOST_ARCH
 203
 204 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 205
 206 void StgRunIsImplementedInAssembler(void);
 207 void StgRunIsImplementedInAssembler(void)
 208 {
 209     __asm__ volatile (
 210         /*
 211          * save callee-saves registers on behalf of the STG code.
 212          */
 213         ".globl StgRun\n"
 214         "StgRun:\n\t"
 215         "subq %0, %%rsp\n\t"
 216         "movq %%rsp, %%rax\n\t"
 217         "addq %0-48, %%rax\n\t"
 218         "movq %%rbx,0(%%rax)\n\t"
 219         "movq %%rbp,8(%%rax)\n\t"
 220         "movq %%r12,16(%%rax)\n\t"
 221         "movq %%r13,24(%%rax)\n\t"
 222         "movq %%r14,32(%%rax)\n\t"
 223         "movq %%r15,40(%%rax)\n\t"
 224         /*
 225          * Set BaseReg
 226          */
 227         "movq %%rsi,%%r13\n\t"
 228         /*
 229          * grab the function argument from the stack, and jump to it.
 230          */
 231         "movq %%rdi,%%rax\n\t"
 232         "jmp *%%rax\n\t"
 233
 234         ".global " STG_RETURN "\n"
 235         STG_RETURN ":\n\t"
 236
 237         "movq %%rbx, %%rax\n\t"   /* Return value in R1  */
 238
 239         /*
 240          * restore callee-saves registers.  (Don't stomp on %%rax!)
 241          */
 242         "movq %%rsp, %%rdx\n\t"
 243         "addq %0-48, %%rdx\n\t"
 244         "movq 0(%%rdx),%%rbx\n\t"       /* restore the registers saved above */
 245         "movq 8(%%rdx),%%rbp\n\t"
 246         "movq 16(%%rdx),%%r12\n\t"
 247         "movq 24(%%rdx),%%r13\n\t"
 248         "movq 32(%%rdx),%%r14\n\t"
 249         "movq 40(%%rdx),%%r15\n\t"
 250         "addq %0, %%rsp\n\t"
 251         "retq"
 252
 253         : : "i"(RESERVED_C_STACK_BYTES+48+8 /*stack frame size*/));
 254     /*
 255        HACK alert!
 256
 257        The x86_64 ABI specifies that on a procedure call, %rsp is
 258        aligned on a 16-byte boundary + 8.  That is, the first
 259        argument on the stack after the return address will be
 260        16-byte aligned.
 261
 262        Which should be fine: RESERVED_C_STACK_BYTES+48 is a multiple
 263        of 16 bytes.
 264
 265        BUT... when we do a C-call from STG land, gcc likes to put the
 266        stack alignment adjustment in the prolog.  eg. if we're calling
 267        a function with arguments in regs, gcc will insert 'subq $8,%rsp'
 268        in the prolog, to keep %rsp aligned (the return address is 8
 269        bytes, remember).  The mangler throws away the prolog, so we
 270        lose the stack alignment.
 271
 272        The hack is to add this extra 8 bytes to our %rsp adjustment
 273        here, so that throughout STG code, %rsp is 16-byte aligned,
 274        ready for a C-call.
 275
 276        A quick way to see if this is wrong is to compile this code:
 277
 278           main = System.Exit.exitWith ExitSuccess
 279
 280        And run it with +RTS -sstderr.  The stats code in the RTS, in
 281        particular statsPrintf(), relies on the stack alignment because
 282        it saves the %xmm regs on the stack, so it'll fall over if the
 283        stack isn't aligned, and calling exitWith from Haskell invokes
 284        shutdownHaskellAndExit using a C call.
 285
 286        Future gcc releases will almost certainly break this hack...
 287     */
 288 }
 289
 290 #endif /* x86-64 */
 291
 292 /* -----------------------------------------------------------------------------
 293    Sparc architecture
 294
 295    --
 296    OLD COMMENT from GHC-3.02:
 297
 298    We want tailjumps to be calls, because `call xxx' is the only Sparc
 299    branch that allows an arbitrary label as a target.  (Gcc's ``goto
 300    *target'' construct ends up loading the label into a register and
 301    then jumping, at the cost of two extra instructions for the 32-bit
 302    load.)
 303
 304    When entering the threaded world, we stash our return address in a
 305    known location so that \tr{%i7} is available as an extra
 306    callee-saves register.  Of course, we have to restore this when
 307    coming out of the threaded world.
 308
 309    I hate this god-forsaken architecture.  Since the top of the
 310    reserved stack space is used for globals and the bottom is reserved
 311    for outgoing arguments, we have to stick our return address
 312    somewhere in the middle.  Currently, I'm allowing 100 extra
 313    outgoing arguments beyond the first 6.  --JSM
 314
 315    Updated info (GHC 4.06): we don't appear to use %i7 any more, so
 316    I'm not sure whether we still need to save it.  Incedentally, what
 317    does the last paragraph above mean when it says "the top of the
 318    stack is used for globals"?  What globals?  --SDM
 319
 320    Updated info (GHC 4.08.2): not saving %i7 any more (see below).
 321    -------------------------------------------------------------------------- */
 322
 323 #ifdef sparc_HOST_ARCH
 324
 325 StgRegTable *
 326 StgRun(StgFunPtr f, StgRegTable *basereg) {
 327
 328     unsigned char space[RESERVED_C_STACK_BYTES];
 329 #if 0
 330     register void *i7 __asm__("%i7");
 331     ((void **)(space))[100] = i7;
 332 #endif
 333     f();
 334     __asm__ volatile (
 335             ".align 4\n"
 336             ".global " STG_RETURN "\n"
 337             STG_RETURN ":"
 338             : : : "l0","l1","l2","l3","l4","l5","l6","l7");
 339     /* we tell the C compiler that l0-l7 are clobbered on return to
 340      * StgReturn, otherwise it tries to use these to save eg. the
 341      * address of space[100] across the call.  The correct thing
 342      * to do would be to save all the callee-saves regs, but we
 343      * can't be bothered to do that.
 344      *
 345      * The code that gcc generates for this little fragment is now
 346      * terrible.  We could do much better by coding it directly in
 347      * assembler.
 348      */
 349 #if 0
 350     /* updated 4.08.2: we don't save %i7 in the middle of the reserved
 351      * space any more, since gcc tries to save its address across the
 352      * call to f(), this gets clobbered in STG land and we end up
 353      * dereferencing a bogus pointer in StgReturn.
 354      */
 355     __asm__ volatile ("ld %1,%0"
 356                       : "=r" (i7) : "m" (((void **)(space))[100]));
 357 #endif
 358     return (StgRegTable *)R1.i;
 359 }
 360
 361 #endif
 362
 363 /* -----------------------------------------------------------------------------
 364    alpha architecture
 365
 366    "The stack pointer (SP) must at all times denote an address that has octaword
 367     alignment. (This restriction has the side effect that the in-memory portion
 368     of the argument list, if any, will start on an octaword boundary.) Note that
 369     the stack grows toward lower addresses. During a procedure invocation, SP
 370     can never be set to a value that is higher than the value of SP at entry to
 371     that procedure invocation.
 372
 373    "The contents of the stack, located above the portion of the argument list
 374     (if any) that is passed in memory, belong to the calling procedure. Because
 375     they are part of the calling procedure, they should not be read or written
 376     by the called procedure, except as specified by indirect arguments or
 377     language-controlled up-level references.
 378
 379    "The SP value might be used by the hardware when raising exceptions and
 380     asynchronous interrupts. It must be assumed that the contents of the stack
 381     below the current SP value and within the stack for the current thread are
 382     continually and unpredictably modified, as specified in the _Alpha
 383     Architecture Reference Manual_, and as a result of asynchronous software
 384     actions."
 385
 386    -- Compaq Computer Corporation, Houston. Tru64 UNIX Calling Standard for
 387       Alpha Systems, 5.1 edition, August 2000, section 3.2.1.  http://www.
 388       tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_PDF/ARH9MBTE.PDF
 389    -------------------------------------------------------------------------- */
 390
 391 #ifdef alpha_HOST_ARCH
 392
 393 StgRegTable *
 394 StgRun(StgFunPtr f, StgRegTable *basereg)
 395 {
 396     register long   real_ra __asm__("$26"); volatile long   save_ra;
 397     register long   real_gp __asm__("$29"); volatile long   save_gp;
 398
 399     register long   real_s0 __asm__("$9" ); volatile long   save_s0;
 400     register long   real_s1 __asm__("$10"); volatile long   save_s1;
 401     register long   real_s2 __asm__("$11"); volatile long   save_s2;
 402     register long   real_s3 __asm__("$12"); volatile long   save_s3;
 403     register long   real_s4 __asm__("$13"); volatile long   save_s4;
 404     register long   real_s5 __asm__("$14"); volatile long   save_s5;
 405 #ifdef alpha_EXTRA_CAREFUL
 406     register long   real_s6 __asm__("$15"); volatile long   save_s6;
 407 #endif
 408
 409     register double real_f2 __asm__("$f2"); volatile double save_f2;
 410     register double real_f3 __asm__("$f3"); volatile double save_f3;
 411     register double real_f4 __asm__("$f4"); volatile double save_f4;
 412     register double real_f5 __asm__("$f5"); volatile double save_f5;
 413     register double real_f6 __asm__("$f6"); volatile double save_f6;
 414     register double real_f7 __asm__("$f7"); volatile double save_f7;
 415 #ifdef alpha_EXTRA_CAREFUL
 416     register double real_f8 __asm__("$f8"); volatile double save_f8;
 417     register double real_f9 __asm__("$f9"); volatile double save_f9;
 418 #endif
 419
 420     register StgFunPtr real_pv __asm__("$27");
 421
 422     StgRegTable * ret;
 423
 424     save_ra = real_ra;
 425     save_gp = real_gp;
 426
 427     save_s0 = real_s0;
 428     save_s1 = real_s1;
 429     save_s2 = real_s2;
 430     save_s3 = real_s3;
 431     save_s4 = real_s4;
 432     save_s5 = real_s5;
 433 #ifdef alpha_EXTRA_CAREFUL
 434     save_s6 = real_s6;
 435 #endif
 436
 437     save_f2 = real_f2;
 438     save_f3 = real_f3;
 439     save_f4 = real_f4;
 440     save_f5 = real_f5;
 441     save_f6 = real_f6;
 442     save_f7 = real_f7;
 443 #ifdef alpha_EXTRA_CAREFUL
 444     save_f8 = real_f8;
 445     save_f9 = real_f9;
 446 #endif
 447
 448     real_pv = f;
 449
 450     __asm__ volatile(   "lda $30,-%0($30)"      "\n"
 451                 "\t"    "jmp ($27)"             "\n"
 452                 "\t"    ".align 3"              "\n"
 453                 ".globl " STG_RETURN            "\n"
 454                 STG_RETURN ":"                  "\n"
 455                 "\t"    "lda $30,%0($30)"       "\n"
 456                 : : "K" (RESERVED_C_STACK_BYTES));
 457
 458     ret = real_s5;
 459
 460     real_s0 = save_s0;
 461     real_s1 = save_s1;
 462     real_s2 = save_s2;
 463     real_s3 = save_s3;
 464     real_s4 = save_s4;
 465     real_s5 = save_s5;
 466 #ifdef alpha_EXTRA_CAREFUL
 467     real_s6 = save_s6;
 468 #endif
 469
 470     real_f2 = save_f2;
 471     real_f3 = save_f3;
 472     real_f4 = save_f4;
 473     real_f5 = save_f5;
 474     real_f6 = save_f6;
 475     real_f7 = save_f7;
 476 #ifdef alpha_EXTRA_CAREFUL
 477     real_f8 = save_f8;
 478     real_f9 = save_f9;
 479 #endif
 480
 481     real_ra = save_ra;
 482     real_gp = save_gp;
 483
 484     return ret;
 485 }
 486
 487 #endif /* alpha_HOST_ARCH */
 488
 489 /* -----------------------------------------------------------------------------
 490    HP-PA architecture
 491    -------------------------------------------------------------------------- */
 492
 493 #ifdef hppa1_1_HOST_ARCH
 494
 495 StgRegTable *
 496 StgRun(StgFunPtr f, StgRegTable *basereg)
 497 {
 498     StgChar space[RESERVED_C_STACK_BYTES+16*sizeof(long)+10*sizeof(double)];
 499     StgRegTable * ret;
 500
 501     __asm__ volatile ("ldo %0(%%r30),%%r19\n"
 502                       "\tstw %%r3, 0(0,%%r19)\n"
 503                       "\tstw %%r4, 4(0,%%r19)\n"
 504                       "\tstw %%r5, 8(0,%%r19)\n"
 505                       "\tstw %%r6,12(0,%%r19)\n"
 506                       "\tstw %%r7,16(0,%%r19)\n"
 507                       "\tstw %%r8,20(0,%%r19)\n"
 508                       "\tstw %%r9,24(0,%%r19)\n"
 509                       "\tstw %%r10,28(0,%%r19)\n"
 510                       "\tstw %%r11,32(0,%%r19)\n"
 511                       "\tstw %%r12,36(0,%%r19)\n"
 512                       "\tstw %%r13,40(0,%%r19)\n"
 513                       "\tstw %%r14,44(0,%%r19)\n"
 514                       "\tstw %%r15,48(0,%%r19)\n"
 515                       "\tstw %%r16,52(0,%%r19)\n"
 516                       "\tstw %%r17,56(0,%%r19)\n"
 517                       "\tstw %%r18,60(0,%%r19)\n"
 518                       "\tldo 80(%%r19),%%r19\n"
 519                       "\tfstds %%fr12,-16(0,%%r19)\n"
 520                       "\tfstds %%fr13, -8(0,%%r19)\n"
 521                       "\tfstds %%fr14,  0(0,%%r19)\n"
 522                       "\tfstds %%fr15,  8(0,%%r19)\n"
 523                       "\tldo 32(%%r19),%%r19\n"
 524                       "\tfstds %%fr16,-16(0,%%r19)\n"
 525                       "\tfstds %%fr17, -8(0,%%r19)\n"
 526                       "\tfstds %%fr18,  0(0,%%r19)\n"
 527                       "\tfstds %%fr19,  8(0,%%r19)\n"
 528                       "\tldo 32(%%r19),%%r19\n"
 529                       "\tfstds %%fr20,-16(0,%%r19)\n"
 530                       "\tfstds %%fr21, -8(0,%%r19)\n" : :
 531                       "n" (-(116 * sizeof(long) + 10 * sizeof(double))) : "%r19"
 532                       );
 533
 534     f();
 535
 536     __asm__ volatile (".align 4\n"
 537                       "\t.EXPORT " STG_RETURN ",CODE\n"
 538                       "\t.EXPORT " STG_RETURN ",ENTRY,PRIV_LEV=3\n"
 539                       STG_RETURN "\n"
 540                       /* "\tldo %0(%%r3),%%r19\n" */
 541                       "\tldo %1(%%r30),%%r19\n"
 542                       "\tcopy %%r11, %0\n"  /* save R1 */
 543                       "\tldw  0(0,%%r19),%%r3\n"
 544                       "\tldw  4(0,%%r19),%%r4\n"
 545                       "\tldw  8(0,%%r19),%%r5\n"
 546                       "\tldw 12(0,%%r19),%%r6\n"
 547                       "\tldw 16(0,%%r19),%%r7\n"
 548                       "\tldw 20(0,%%r19),%%r8\n"
 549                       "\tldw 24(0,%%r19),%%r9\n"
 550                       "\tldw 28(0,%%r19),%%r10\n"
 551                       "\tldw 32(0,%%r19),%%r11\n"
 552                       "\tldw 36(0,%%r19),%%r12\n"
 553                       "\tldw 40(0,%%r19),%%r13\n"
 554                       "\tldw 44(0,%%r19),%%r14\n"
 555                       "\tldw 48(0,%%r19),%%r15\n"
 556                       "\tldw 52(0,%%r19),%%r16\n"
 557                       "\tldw 56(0,%%r19),%%r17\n"
 558                       "\tldw 60(0,%%r19),%%r18\n"
 559                       "\tldo 80(%%r19),%%r19\n"
 560                       "\tfldds -16(0,%%r19),%%fr12\n"
 561                       "\tfldds  -8(0,%%r19),%%fr13\n"
 562                       "\tfldds   0(0,%%r19),%%fr14\n"
 563                       "\tfldds   8(0,%%r19),%%fr15\n"
 564                       "\tldo 32(%%r19),%%r19\n"
 565                       "\tfldds -16(0,%%r19),%%fr16\n"
 566                       "\tfldds  -8(0,%%r19),%%fr17\n"
 567                       "\tfldds   0(0,%%r19),%%fr18\n"
 568                       "\tfldds   8(0,%%r19),%%fr19\n"
 569                       "\tldo 32(%%r19),%%r19\n"
 570                       "\tfldds -16(0,%%r19),%%fr20\n"
 571                       "\tfldds  -8(0,%%r19),%%fr21\n"
 572                          : "=r" (ret)
 573                          : "n" (-(116 * sizeof(long) + 10 * sizeof(double)))
 574                          : "%r19"
 575                       );
 576
 577     return ret;
 578 }
 579
 580 #endif /* hppa1_1_HOST_ARCH */
 581
 582 /* -----------------------------------------------------------------------------
 583    PowerPC architecture
 584
 585    Everything is in assembler, so we don't have to deal with GCC...
 586
 587    -------------------------------------------------------------------------- */
 588
 589 #ifdef powerpc_HOST_ARCH
 590
 591 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 592
 593 #ifdef darwin_HOST_OS
 594 void StgRunIsImplementedInAssembler(void)
 595 {
 596 #if HAVE_SUBSECTIONS_VIA_SYMBOLS
 597             // if the toolchain supports deadstripping, we have to
 598             // prevent it here (it tends to get confused here).
 599         __asm__ volatile (".no_dead_strip _StgRunIsImplementedInAssembler");
 600 #endif
 601         __asm__ volatile (
 602                 "\n.globl _StgRun\n"
 603                 "_StgRun:\n"
 604                 "\tmflr r0\n"
 605                 "\tbl saveFP # f14\n"
 606                 "\tstmw r13,-220(r1)\n"
 607                 "\tstwu r1,-%0(r1)\n"
 608                 "\tmr r27,r4\n" // BaseReg == r27
 609                 "\tmtctr r3\n"
 610                 "\tmr r12,r3\n"
 611                 "\tbctr\n"
 612                 ".globl _StgReturn\n"
 613                 "_StgReturn:\n"
 614                 "\tmr r3,r14\n"
 615                 "\tla r1,%0(r1)\n"
 616                 "\tlmw r13,-220(r1)\n"
 617                 "\tb restFP # f14\n"
 618         : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
 619 }
 620 #else
 621
 622 // This version is for PowerPC Linux.
 623
 624 // Differences from the Darwin/Mac OS X version:
 625 // *) Different Assembler Syntax
 626 // *) Doesn't use Register Saving Helper Functions (although they exist somewhere)
 627 // *) We may not access positive stack offsets
 628 //    (no "Red Zone" as in the Darwin ABI)
 629 // *) The Link Register is saved to a different offset in the caller's stack frame
 630 //    (Linux: 4(r1), Darwin 8(r1))
 631
 632 static void StgRunIsImplementedInAssembler(void)
 633 {
 634         __asm__ volatile (
 635                 "\t.globl StgRun\n"
 636                 "\t.type StgRun,@function\n"
 637                 "StgRun:\n"
 638                 "\tmflr 0\n"
 639                 "\tstw 0,4(1)\n"
 640                 "\tmr 5,1\n"
 641                 "\tstwu 1,-%0(1)\n"
 642                 "\tstmw 13,-220(5)\n"
 643                 "\tstfd 14,-144(5)\n"
 644                 "\tstfd 15,-136(5)\n"
 645                 "\tstfd 16,-128(5)\n"
 646                 "\tstfd 17,-120(5)\n"
 647                 "\tstfd 18,-112(5)\n"
 648                 "\tstfd 19,-104(5)\n"
 649                 "\tstfd 20,-96(5)\n"
 650                 "\tstfd 21,-88(5)\n"
 651                 "\tstfd 22,-80(5)\n"
 652                 "\tstfd 23,-72(5)\n"
 653                 "\tstfd 24,-64(5)\n"
 654                 "\tstfd 25,-56(5)\n"
 655                 "\tstfd 26,-48(5)\n"
 656                 "\tstfd 27,-40(5)\n"
 657                 "\tstfd 28,-32(5)\n"
 658                 "\tstfd 29,-24(5)\n"
 659                 "\tstfd 30,-16(5)\n"
 660                 "\tstfd 31,-8(5)\n"
 661                 "\tmr 27,4\n"  // BaseReg == r27
 662                 "\tmtctr 3\n"
 663                 "\tmr 12,3\n"
 664                 "\tbctr\n"
 665                 ".globl StgReturn\n"
 666                 "\t.type StgReturn,@function\n"
 667                 "StgReturn:\n"
 668                 "\tmr 3,14\n"
 669                 "\tla 5,%0(1)\n"
 670                 "\tlmw 13,-220(5)\n"
 671                 "\tlfd 14,-144(5)\n"
 672                 "\tlfd 15,-136(5)\n"
 673                 "\tlfd 16,-128(5)\n"
 674                 "\tlfd 17,-120(5)\n"
 675                 "\tlfd 18,-112(5)\n"
 676                 "\tlfd 19,-104(5)\n"
 677                 "\tlfd 20,-96(5)\n"
 678                 "\tlfd 21,-88(5)\n"
 679                 "\tlfd 22,-80(5)\n"
 680                 "\tlfd 23,-72(5)\n"
 681                 "\tlfd 24,-64(5)\n"
 682                 "\tlfd 25,-56(5)\n"
 683                 "\tlfd 26,-48(5)\n"
 684                 "\tlfd 27,-40(5)\n"
 685                 "\tlfd 28,-32(5)\n"
 686                 "\tlfd 29,-24(5)\n"
 687                 "\tlfd 30,-16(5)\n"
 688                 "\tlfd 31,-8(5)\n"
 689                 "\tmr 1,5\n"
 690                 "\tlwz 0,4(1)\n"
 691                 "\tmtlr 0\n"
 692                 "\tblr\n"
 693         : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
 694 }
 695 #endif
 696
 697 #endif
 698
 699 /* -----------------------------------------------------------------------------
 700    PowerPC 64 architecture
 701
 702    Everything is in assembler, so we don't have to deal with GCC...
 703
 704    -------------------------------------------------------------------------- */
 705
 706 #ifdef powerpc64_HOST_ARCH
 707
 708 #ifdef linux_HOST_OS
 709 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 710
 711 static void StgRunIsImplementedInAssembler(void)
 712 {
 713         // r0 volatile
 714         // r1 stack pointer
 715         // r2 toc - needs to be saved
 716         // r3-r10 argument passing, volatile
 717         // r11, r12 very volatile (not saved across cross-module calls)
 718         // r13 thread local state (never modified, don't need to save)
 719         // r14-r31 callee-save
 720         __asm__ volatile (
 721                 ".section \".opd\",\"aw\"\n"
 722                 ".align 3\n"
 723                 ".globl StgRun\n"
 724                 "StgRun:\n"
 725                         "\t.quad\t.StgRun,.TOC.@tocbase,0\n"
 726                         "\t.size StgRun,24\n"
 727                 ".globl StgReturn\n"
 728                 "StgReturn:\n"
 729                         "\t.quad\t.StgReturn,.TOC.@tocbase,0\n"
 730                         "\t.size StgReturn,24\n"
 731                 ".previous\n"
 732                 ".globl .StgRun\n"
 733                 ".type .StgRun,@function\n"
 734                 ".StgRun:\n"
 735                         "\tmflr 0\n"
 736                         "\tmr 5, 1\n"
 737                         "\tstd 0, 16(1)\n"
 738                         "\tstdu 1, -%0(1)\n"
 739                         "\tstd 2, -296(5)\n"
 740                         "\tstd 14, -288(5)\n"
 741                         "\tstd 15, -280(5)\n"
 742                         "\tstd 16, -272(5)\n"
 743                         "\tstd 17, -264(5)\n"
 744                         "\tstd 18, -256(5)\n"
 745                         "\tstd 19, -248(5)\n"
 746                         "\tstd 20, -240(5)\n"
 747                         "\tstd 21, -232(5)\n"
 748                         "\tstd 22, -224(5)\n"
 749                         "\tstd 23, -216(5)\n"
 750                         "\tstd 24, -208(5)\n"
 751                         "\tstd 25, -200(5)\n"
 752                         "\tstd 26, -192(5)\n"
 753                         "\tstd 27, -184(5)\n"
 754                         "\tstd 28, -176(5)\n"
 755                         "\tstd 29, -168(5)\n"
 756                         "\tstd 30, -160(5)\n"
 757                         "\tstd 31, -152(5)\n"
 758                         "\tstfd 14, -144(5)\n"
 759                         "\tstfd 15, -136(5)\n"
 760                         "\tstfd 16, -128(5)\n"
 761                         "\tstfd 17, -120(5)\n"
 762                         "\tstfd 18, -112(5)\n"
 763                         "\tstfd 19, -104(5)\n"
 764                         "\tstfd 20, -96(5)\n"
 765                         "\tstfd 21, -88(5)\n"
 766                         "\tstfd 22, -80(5)\n"
 767                         "\tstfd 23, -72(5)\n"
 768                         "\tstfd 24, -64(5)\n"
 769                         "\tstfd 25, -56(5)\n"
 770                         "\tstfd 26, -48(5)\n"
 771                         "\tstfd 27, -40(5)\n"
 772                         "\tstfd 28, -32(5)\n"
 773                         "\tstfd 29, -24(5)\n"
 774                         "\tstfd 30, -16(5)\n"
 775                         "\tstfd 31, -8(5)\n"
 776                         "\tmr 27, 4\n"  // BaseReg == r27
 777                         "\tld 2, 8(3)\n"
 778                         "\tld 3, 0(3)\n"
 779                         "\tmtctr 3\n"
 780                         "\tbctr\n"
 781                 ".globl .StgReturn\n"
 782                 ".type .StgReturn,@function\n"
 783                 ".StgReturn:\n"
 784                         "\tmr 3,14\n"
 785                         "\tla 5, %0(1)\n" // load address == addi r5, r1, %0
 786                         "\tld 2, -296(5)\n"
 787                         "\tld 14, -288(5)\n"
 788                         "\tld 15, -280(5)\n"
 789                         "\tld 16, -272(5)\n"
 790                         "\tld 17, -264(5)\n"
 791                         "\tld 18, -256(5)\n"
 792                         "\tld 19, -248(5)\n"
 793                         "\tld 20, -240(5)\n"
 794                         "\tld 21, -232(5)\n"
 795                         "\tld 22, -224(5)\n"
 796                         "\tld 23, -216(5)\n"
 797                         "\tld 24, -208(5)\n"
 798                         "\tld 25, -200(5)\n"
 799                         "\tld 26, -192(5)\n"
 800                         "\tld 27, -184(5)\n"
 801                         "\tld 28, -176(5)\n"
 802                         "\tld 29, -168(5)\n"
 803                         "\tld 30, -160(5)\n"
 804                         "\tld 31, -152(5)\n"
 805                         "\tlfd 14, -144(5)\n"
 806                         "\tlfd 15, -136(5)\n"
 807                         "\tlfd 16, -128(5)\n"
 808                         "\tlfd 17, -120(5)\n"
 809                         "\tlfd 18, -112(5)\n"
 810                         "\tlfd 19, -104(5)\n"
 811                         "\tlfd 20, -96(5)\n"
 812                         "\tlfd 21, -88(5)\n"
 813                         "\tlfd 22, -80(5)\n"
 814                         "\tlfd 23, -72(5)\n"
 815                         "\tlfd 24, -64(5)\n"
 816                         "\tlfd 25, -56(5)\n"
 817                         "\tlfd 26, -48(5)\n"
 818                         "\tlfd 27, -40(5)\n"
 819                         "\tlfd 28, -32(5)\n"
 820                         "\tlfd 29, -24(5)\n"
 821                         "\tlfd 30, -16(5)\n"
 822                         "\tlfd 31, -8(5)\n"
 823                         "\tmr 1, 5\n"
 824                         "\tld 0, 16(1)\n"
 825                         "\tmtlr 0\n"
 826                         "\tblr\n"
 827         : : "i"(RESERVED_C_STACK_BYTES+304 /*stack frame size*/));
 828 }
 829 #else // linux_HOST_OS
 830 #error Only linux support for power64 right now.
 831 #endif
 832
 833 #endif
 834
 835 /* -----------------------------------------------------------------------------
 836    IA64 architecture
 837
 838    Again, in assembler - so we can fiddle with the register stack, and because
 839    gcc doesn't handle asm-clobbered callee-saves correctly.
 840
 841    loc0  - loc15: preserved locals
 842    loc16 - loc28: STG registers
 843            loc29: saved ar.pfs
 844            loc30: saved b0
 845            loc31: saved gp (gcc 3.3 uses this slot)
 846    -------------------------------------------------------------------------- */
 847
 848 #ifdef ia64_HOST_ARCH
 849
 850 /* the memory stack is rarely used, so 16K is excessive */
 851 #undef RESERVED_C_STACK_BYTES
 852 #define RESERVED_C_STACK_BYTES 1024
 853
 854 #if ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3)
 855 /* gcc 3.3+: leave an extra slot for gp saves */
 856 #define LOCALS 32
 857 #else
 858 #define LOCALS 31
 859 #endif
 860
 861 static void StgRunIsImplementedInAssembler(void)
 862 {
 863     __asm__ volatile(
 864                 ".global StgRun\n"
 865                 "StgRun:\n"
 866                 "\talloc loc29 = ar.pfs, 0, %1, 8, 0\n" /* setup register frame */
 867                 "\tld8 r18 = [r32],8\n"                 /* get procedure address */
 868                 "\tadds sp = -%0, sp ;;\n"              /* setup stack */
 869                 "\tld8 gp = [r32]\n"                    /* get procedure GP */
 870                 "\tadds r16 = %0-(6*16), sp\n"
 871                 "\tadds r17 = %0-(5*16), sp ;;\n"
 872                 "\tstf.spill [r16] = f16,32\n"          /* spill callee-saved fp regs */
 873                 "\tstf.spill [r17] = f17,32\n"
 874                 "\tmov b6 = r18 ;;\n"                   /* set target address */
 875                 "\tstf.spill [r16] = f18,32\n"
 876                 "\tstf.spill [r17] = f19,32\n"
 877                 "\tmov loc30 = b0 ;;\n"                 /* save return address */
 878                 "\tstf.spill [r16] = f20,32\n"
 879                 "\tstf.spill [r17] = f21,32\n"
 880                 "\tbr.few b6 ;;\n"                      /* branch to function */
 881                 ".global StgReturn\n"
 882                 "StgReturn:\n"
 883                 "\tmov r8 = loc16\n"            /* return value in r8 */
 884                 "\tadds r16 = %0-(6*16), sp\n"
 885                 "\tadds r17 = %0-(5*16), sp ;;\n"
 886                 "\tldf.fill f16 = [r16],32\n"   /* start restoring fp regs */
 887                 "\tldf.fill f17 = [r17],32\n"
 888                 "\tmov ar.pfs = loc29 ;;\n"     /* restore register frame */
 889                 "\tldf.fill f18 = [r16],32\n"
 890                 "\tldf.fill f19 = [r17],32\n"
 891                 "\tmov b0 = loc30 ;;\n"         /* restore return address */
 892                 "\tldf.fill f20 = [r16],32\n"
 893                 "\tldf.fill f21 = [r17],32\n"
 894                 "\tadds sp = %0, sp\n"          /* restore stack */
 895                 "\tbr.ret.sptk.many b0 ;;\n"    /* return */
 896         : : "i"(RESERVED_C_STACK_BYTES + 6*16), "i"(LOCALS));
 897 }
 898
 899 #endif
 900
 901 #endif /* !USE_MINIINTERPRETER */