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         /*
 149          * Darwin note:
 150          * The stack pointer has to be aligned to a multiple of 16 bytes at
 151          * this point. This works out correctly with gcc 4.0.1, but it might
 152          * break at any time in the future. TODO: Make this future-proof.
 153          */
 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         "movl %%esi, %%eax\n\t"   /* Return value in R1  */
 164
 165         /*
 166          * restore callee-saves registers.  (Don't stomp on %%eax!)
 167          */
 168         "movl %%esp, %%edx\n\t"
 169         "addl %4, %%edx\n\t"
 170         "movl 0(%%edx),%%ebx\n\t"       /* restore the registers saved above */
 171         "movl 4(%%edx),%%esi\n\t"
 172         "movl 8(%%edx),%%edi\n\t"
 173         "movl 12(%%edx),%%ebp\n\t"
 174
 175       : "=&a" (r), "=m" (space)
 176       : "m" (f), "m" (basereg), "i" (RESERVED_C_STACK_BYTES)
 177       : "edx" /* stomps on %edx */
 178     );
 179
 180     return r;
 181 }
 182
 183 #endif
 184
 185 /* ----------------------------------------------------------------------------
 186    x86-64 is almost the same as plain x86.
 187
 188    I've done it using entirely inline assembler, because I couldn't
 189    get gcc to generate the correct subtraction from %rsp by using
 190    the local array variable trick.  It didn't seem to reserve
 191    enough space.  Oh well, it's not much harder this way.
 192
 193    ------------------------------------------------------------------------- */
 194
 195 #ifdef x86_64_HOST_ARCH
 196
 197 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 198
 199 static void GNUC3_ATTRIBUTE(used)
 200 StgRunIsImplementedInAssembler(void)
 201 {
 202     __asm__ volatile (
 203         /*
 204          * save callee-saves registers on behalf of the STG code.
 205          */
 206         ".globl StgRun\n"
 207         "StgRun:\n\t"
 208         "subq %0, %%rsp\n\t"
 209         "movq %%rsp, %%rax\n\t"
 210         "addq %0-48, %%rax\n\t"
 211         "movq %%rbx,0(%%rax)\n\t"
 212         "movq %%rbp,8(%%rax)\n\t"
 213         "movq %%r12,16(%%rax)\n\t"
 214         "movq %%r13,24(%%rax)\n\t"
 215         "movq %%r14,32(%%rax)\n\t"
 216         "movq %%r15,40(%%rax)\n\t"
 217         /*
 218          * Set BaseReg
 219          */
 220         "movq %%rsi,%%r13\n\t"
 221         /*
 222          * grab the function argument from the stack, and jump to it.
 223          */
 224         "movq %%rdi,%%rax\n\t"
 225         "jmp *%%rax\n\t"
 226
 227         ".global " STG_RETURN "\n"
 228         STG_RETURN ":\n\t"
 229
 230         "movq %%rbx, %%rax\n\t"   /* Return value in R1  */
 231
 232         /*
 233          * restore callee-saves registers.  (Don't stomp on %%rax!)
 234          */
 235         "movq %%rsp, %%rdx\n\t"
 236         "addq %0-48, %%rdx\n\t"
 237         "movq 0(%%rdx),%%rbx\n\t"       /* restore the registers saved above */
 238         "movq 8(%%rdx),%%rbp\n\t"
 239         "movq 16(%%rdx),%%r12\n\t"
 240         "movq 24(%%rdx),%%r13\n\t"
 241         "movq 32(%%rdx),%%r14\n\t"
 242         "movq 40(%%rdx),%%r15\n\t"
 243         "addq %0, %%rsp\n\t"
 244         "retq"
 245
 246         : : "i"(RESERVED_C_STACK_BYTES+48+8 /*stack frame size*/));
 247     /*
 248        HACK alert!
 249
 250        The x86_64 ABI specifies that on a procedure call, %rsp is
 251        aligned on a 16-byte boundary + 8.  That is, the first
 252        argument on the stack after the return address will be
 253        16-byte aligned.
 254
 255        Which should be fine: RESERVED_C_STACK_BYTES+48 is a multiple
 256        of 16 bytes.
 257
 258        BUT... when we do a C-call from STG land, gcc likes to put the
 259        stack alignment adjustment in the prolog.  eg. if we're calling
 260        a function with arguments in regs, gcc will insert 'subq $8,%rsp'
 261        in the prolog, to keep %rsp aligned (the return address is 8
 262        bytes, remember).  The mangler throws away the prolog, so we
 263        lose the stack alignment.
 264
 265        The hack is to add this extra 8 bytes to our %rsp adjustment
 266        here, so that throughout STG code, %rsp is 16-byte aligned,
 267        ready for a C-call.
 268
 269        A quick way to see if this is wrong is to compile this code:
 270
 271           main = System.Exit.exitWith ExitSuccess
 272
 273        And run it with +RTS -sstderr.  The stats code in the RTS, in
 274        particular statsPrintf(), relies on the stack alignment because
 275        it saves the %xmm regs on the stack, so it'll fall over if the
 276        stack isn't aligned, and calling exitWith from Haskell invokes
 277        shutdownHaskellAndExit using a C call.
 278
 279        Future gcc releases will almost certainly break this hack...
 280     */
 281 }
 282
 283 #endif /* x86-64 */
 284
 285 /* -----------------------------------------------------------------------------
 286    Sparc architecture
 287
 288    --
 289    OLD COMMENT from GHC-3.02:
 290
 291    We want tailjumps to be calls, because `call xxx' is the only Sparc
 292    branch that allows an arbitrary label as a target.  (Gcc's ``goto
 293    *target'' construct ends up loading the label into a register and
 294    then jumping, at the cost of two extra instructions for the 32-bit
 295    load.)
 296
 297    When entering the threaded world, we stash our return address in a
 298    known location so that \tr{%i7} is available as an extra
 299    callee-saves register.  Of course, we have to restore this when
 300    coming out of the threaded world.
 301
 302    I hate this god-forsaken architecture.  Since the top of the
 303    reserved stack space is used for globals and the bottom is reserved
 304    for outgoing arguments, we have to stick our return address
 305    somewhere in the middle.  Currently, I'm allowing 100 extra
 306    outgoing arguments beyond the first 6.  --JSM
 307
 308    Updated info (GHC 4.06): we don't appear to use %i7 any more, so
 309    I'm not sure whether we still need to save it.  Incedentally, what
 310    does the last paragraph above mean when it says "the top of the
 311    stack is used for globals"?  What globals?  --SDM
 312
 313    Updated info (GHC 4.08.2): not saving %i7 any more (see below).
 314    -------------------------------------------------------------------------- */
 315
 316 #ifdef sparc_HOST_ARCH
 317
 318 StgRegTable *
 319 StgRun(StgFunPtr f, StgRegTable *basereg) {
 320
 321     unsigned char space[RESERVED_C_STACK_BYTES];
 322 #if 0
 323     register void *i7 __asm__("%i7");
 324     ((void **)(space))[100] = i7;
 325 #endif
 326     f();
 327     __asm__ volatile (
 328             ".align 4\n"
 329             ".global " STG_RETURN "\n"
 330             STG_RETURN ":"
 331             : : "p" (space) : "l0","l1","l2","l3","l4","l5","l6","l7");
 332     /* we tell the C compiler that l0-l7 are clobbered on return to
 333      * StgReturn, otherwise it tries to use these to save eg. the
 334      * address of space[100] across the call.  The correct thing
 335      * to do would be to save all the callee-saves regs, but we
 336      * can't be bothered to do that.
 337      *
 338      * We also explicitly mark space as used since gcc eliminates it
 339      * otherwise.
 340      *
 341      * The code that gcc generates for this little fragment is now
 342      * terrible.  We could do much better by coding it directly in
 343      * assembler.
 344      */
 345 #if 0
 346     /* updated 4.08.2: we don't save %i7 in the middle of the reserved
 347      * space any more, since gcc tries to save its address across the
 348      * call to f(), this gets clobbered in STG land and we end up
 349      * dereferencing a bogus pointer in StgReturn.
 350      */
 351     __asm__ volatile ("ld %1,%0"
 352                       : "=r" (i7) : "m" (((void **)(space))[100]));
 353 #endif
 354     return (StgRegTable *)R1.i;
 355 }
 356
 357 #endif
 358
 359 /* -----------------------------------------------------------------------------
 360    alpha architecture
 361
 362    "The stack pointer (SP) must at all times denote an address that has octaword
 363     alignment. (This restriction has the side effect that the in-memory portion
 364     of the argument list, if any, will start on an octaword boundary.) Note that
 365     the stack grows toward lower addresses. During a procedure invocation, SP
 366     can never be set to a value that is higher than the value of SP at entry to
 367     that procedure invocation.
 368
 369    "The contents of the stack, located above the portion of the argument list
 370     (if any) that is passed in memory, belong to the calling procedure. Because
 371     they are part of the calling procedure, they should not be read or written
 372     by the called procedure, except as specified by indirect arguments or
 373     language-controlled up-level references.
 374
 375    "The SP value might be used by the hardware when raising exceptions and
 376     asynchronous interrupts. It must be assumed that the contents of the stack
 377     below the current SP value and within the stack for the current thread are
 378     continually and unpredictably modified, as specified in the _Alpha
 379     Architecture Reference Manual_, and as a result of asynchronous software
 380     actions."
 381
 382    -- Compaq Computer Corporation, Houston. Tru64 UNIX Calling Standard for
 383       Alpha Systems, 5.1 edition, August 2000, section 3.2.1.  http://www.
 384       tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V51_PDF/ARH9MBTE.PDF
 385    -------------------------------------------------------------------------- */
 386
 387 #ifdef alpha_HOST_ARCH
 388
 389 StgRegTable *
 390 StgRun(StgFunPtr f, StgRegTable *basereg)
 391 {
 392     register long   real_ra __asm__("$26"); volatile long   save_ra;
 393     register long   real_gp __asm__("$29"); volatile long   save_gp;
 394
 395     register long   real_s0 __asm__("$9" ); volatile long   save_s0;
 396     register long   real_s1 __asm__("$10"); volatile long   save_s1;
 397     register long   real_s2 __asm__("$11"); volatile long   save_s2;
 398     register long   real_s3 __asm__("$12"); volatile long   save_s3;
 399     register long   real_s4 __asm__("$13"); volatile long   save_s4;
 400     register long   real_s5 __asm__("$14"); volatile long   save_s5;
 401 #ifdef alpha_EXTRA_CAREFUL
 402     register long   real_s6 __asm__("$15"); volatile long   save_s6;
 403 #endif
 404
 405     register double real_f2 __asm__("$f2"); volatile double save_f2;
 406     register double real_f3 __asm__("$f3"); volatile double save_f3;
 407     register double real_f4 __asm__("$f4"); volatile double save_f4;
 408     register double real_f5 __asm__("$f5"); volatile double save_f5;
 409     register double real_f6 __asm__("$f6"); volatile double save_f6;
 410     register double real_f7 __asm__("$f7"); volatile double save_f7;
 411 #ifdef alpha_EXTRA_CAREFUL
 412     register double real_f8 __asm__("$f8"); volatile double save_f8;
 413     register double real_f9 __asm__("$f9"); volatile double save_f9;
 414 #endif
 415
 416     register StgFunPtr real_pv __asm__("$27");
 417
 418     StgRegTable * ret;
 419
 420     save_ra = real_ra;
 421     save_gp = real_gp;
 422
 423     save_s0 = real_s0;
 424     save_s1 = real_s1;
 425     save_s2 = real_s2;
 426     save_s3 = real_s3;
 427     save_s4 = real_s4;
 428     save_s5 = real_s5;
 429 #ifdef alpha_EXTRA_CAREFUL
 430     save_s6 = real_s6;
 431 #endif
 432
 433     save_f2 = real_f2;
 434     save_f3 = real_f3;
 435     save_f4 = real_f4;
 436     save_f5 = real_f5;
 437     save_f6 = real_f6;
 438     save_f7 = real_f7;
 439 #ifdef alpha_EXTRA_CAREFUL
 440     save_f8 = real_f8;
 441     save_f9 = real_f9;
 442 #endif
 443
 444     real_pv = f;
 445
 446     __asm__ volatile(   "lda $30,-%0($30)"      "\n"
 447                 "\t"    "jmp ($27)"             "\n"
 448                 "\t"    ".align 3"              "\n"
 449                 ".globl " STG_RETURN            "\n"
 450                 STG_RETURN ":"                  "\n"
 451                 "\t"    "lda $30,%0($30)"       "\n"
 452                 : : "K" (RESERVED_C_STACK_BYTES));
 453
 454     ret = real_s5;
 455
 456     real_s0 = save_s0;
 457     real_s1 = save_s1;
 458     real_s2 = save_s2;
 459     real_s3 = save_s3;
 460     real_s4 = save_s4;
 461     real_s5 = save_s5;
 462 #ifdef alpha_EXTRA_CAREFUL
 463     real_s6 = save_s6;
 464 #endif
 465
 466     real_f2 = save_f2;
 467     real_f3 = save_f3;
 468     real_f4 = save_f4;
 469     real_f5 = save_f5;
 470     real_f6 = save_f6;
 471     real_f7 = save_f7;
 472 #ifdef alpha_EXTRA_CAREFUL
 473     real_f8 = save_f8;
 474     real_f9 = save_f9;
 475 #endif
 476
 477     real_ra = save_ra;
 478     real_gp = save_gp;
 479
 480     return ret;
 481 }
 482
 483 #endif /* alpha_HOST_ARCH */
 484
 485 /* -----------------------------------------------------------------------------
 486    HP-PA architecture
 487    -------------------------------------------------------------------------- */
 488
 489 #ifdef hppa1_1_HOST_ARCH
 490
 491 StgRegTable *
 492 StgRun(StgFunPtr f, StgRegTable *basereg)
 493 {
 494     StgChar space[RESERVED_C_STACK_BYTES+16*sizeof(long)+10*sizeof(double)];
 495     StgRegTable * ret;
 496
 497     __asm__ volatile ("ldo %0(%%r30),%%r19\n"
 498                       "\tstw %%r3, 0(0,%%r19)\n"
 499                       "\tstw %%r4, 4(0,%%r19)\n"
 500                       "\tstw %%r5, 8(0,%%r19)\n"
 501                       "\tstw %%r6,12(0,%%r19)\n"
 502                       "\tstw %%r7,16(0,%%r19)\n"
 503                       "\tstw %%r8,20(0,%%r19)\n"
 504                       "\tstw %%r9,24(0,%%r19)\n"
 505                       "\tstw %%r10,28(0,%%r19)\n"
 506                       "\tstw %%r11,32(0,%%r19)\n"
 507                       "\tstw %%r12,36(0,%%r19)\n"
 508                       "\tstw %%r13,40(0,%%r19)\n"
 509                       "\tstw %%r14,44(0,%%r19)\n"
 510                       "\tstw %%r15,48(0,%%r19)\n"
 511                       "\tstw %%r16,52(0,%%r19)\n"
 512                       "\tstw %%r17,56(0,%%r19)\n"
 513                       "\tstw %%r18,60(0,%%r19)\n"
 514                       "\tldo 80(%%r19),%%r19\n"
 515                       "\tfstds %%fr12,-16(0,%%r19)\n"
 516                       "\tfstds %%fr13, -8(0,%%r19)\n"
 517                       "\tfstds %%fr14,  0(0,%%r19)\n"
 518                       "\tfstds %%fr15,  8(0,%%r19)\n"
 519                       "\tldo 32(%%r19),%%r19\n"
 520                       "\tfstds %%fr16,-16(0,%%r19)\n"
 521                       "\tfstds %%fr17, -8(0,%%r19)\n"
 522                       "\tfstds %%fr18,  0(0,%%r19)\n"
 523                       "\tfstds %%fr19,  8(0,%%r19)\n"
 524                       "\tldo 32(%%r19),%%r19\n"
 525                       "\tfstds %%fr20,-16(0,%%r19)\n"
 526                       "\tfstds %%fr21, -8(0,%%r19)\n" : :
 527                       "n" (-(116 * sizeof(long) + 10 * sizeof(double))) : "%r19"
 528                       );
 529
 530     f();
 531
 532     __asm__ volatile (".align 4\n"
 533                       "\t.EXPORT " STG_RETURN ",CODE\n"
 534                       "\t.EXPORT " STG_RETURN ",ENTRY,PRIV_LEV=3\n"
 535                       STG_RETURN "\n"
 536                       /* "\tldo %0(%%r3),%%r19\n" */
 537                       "\tldo %1(%%r30),%%r19\n"
 538                       "\tcopy %%r11, %0\n"  /* save R1 */
 539                       "\tldw  0(0,%%r19),%%r3\n"
 540                       "\tldw  4(0,%%r19),%%r4\n"
 541                       "\tldw  8(0,%%r19),%%r5\n"
 542                       "\tldw 12(0,%%r19),%%r6\n"
 543                       "\tldw 16(0,%%r19),%%r7\n"
 544                       "\tldw 20(0,%%r19),%%r8\n"
 545                       "\tldw 24(0,%%r19),%%r9\n"
 546                       "\tldw 28(0,%%r19),%%r10\n"
 547                       "\tldw 32(0,%%r19),%%r11\n"
 548                       "\tldw 36(0,%%r19),%%r12\n"
 549                       "\tldw 40(0,%%r19),%%r13\n"
 550                       "\tldw 44(0,%%r19),%%r14\n"
 551                       "\tldw 48(0,%%r19),%%r15\n"
 552                       "\tldw 52(0,%%r19),%%r16\n"
 553                       "\tldw 56(0,%%r19),%%r17\n"
 554                       "\tldw 60(0,%%r19),%%r18\n"
 555                       "\tldo 80(%%r19),%%r19\n"
 556                       "\tfldds -16(0,%%r19),%%fr12\n"
 557                       "\tfldds  -8(0,%%r19),%%fr13\n"
 558                       "\tfldds   0(0,%%r19),%%fr14\n"
 559                       "\tfldds   8(0,%%r19),%%fr15\n"
 560                       "\tldo 32(%%r19),%%r19\n"
 561                       "\tfldds -16(0,%%r19),%%fr16\n"
 562                       "\tfldds  -8(0,%%r19),%%fr17\n"
 563                       "\tfldds   0(0,%%r19),%%fr18\n"
 564                       "\tfldds   8(0,%%r19),%%fr19\n"
 565                       "\tldo 32(%%r19),%%r19\n"
 566                       "\tfldds -16(0,%%r19),%%fr20\n"
 567                       "\tfldds  -8(0,%%r19),%%fr21\n"
 568                          : "=r" (ret)
 569                          : "n" (-(116 * sizeof(long) + 10 * sizeof(double)))
 570                          : "%r19"
 571                       );
 572
 573     return ret;
 574 }
 575
 576 #endif /* hppa1_1_HOST_ARCH */
 577
 578 /* -----------------------------------------------------------------------------
 579    PowerPC architecture
 580
 581    Everything is in assembler, so we don't have to deal with GCC...
 582
 583    -------------------------------------------------------------------------- */
 584
 585 #ifdef powerpc_HOST_ARCH
 586
 587 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 588
 589 #ifdef darwin_HOST_OS
 590 void StgRunIsImplementedInAssembler(void)
 591 {
 592 #if HAVE_SUBSECTIONS_VIA_SYMBOLS
 593             // if the toolchain supports deadstripping, we have to
 594             // prevent it here (it tends to get confused here).
 595         __asm__ volatile (".no_dead_strip _StgRunIsImplementedInAssembler");
 596 #endif
 597         __asm__ volatile (
 598                 "\n.globl _StgRun\n"
 599                 "_StgRun:\n"
 600                 "\tmflr r0\n"
 601                 "\tbl saveFP # f14\n"
 602                 "\tstmw r13,-220(r1)\n"
 603                 "\tstwu r1,-%0(r1)\n"
 604                 "\tmr r27,r4\n" // BaseReg == r27
 605                 "\tmtctr r3\n"
 606                 "\tmr r12,r3\n"
 607                 "\tbctr\n"
 608                 ".globl _StgReturn\n"
 609                 "_StgReturn:\n"
 610                 "\tmr r3,r14\n"
 611                 "\tla r1,%0(r1)\n"
 612                 "\tlmw r13,-220(r1)\n"
 613                 "\tb restFP # f14\n"
 614         : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
 615 }
 616 #else
 617
 618 // This version is for PowerPC Linux.
 619
 620 // Differences from the Darwin/Mac OS X version:
 621 // *) Different Assembler Syntax
 622 // *) Doesn't use Register Saving Helper Functions (although they exist somewhere)
 623 // *) We may not access positive stack offsets
 624 //    (no "Red Zone" as in the Darwin ABI)
 625 // *) The Link Register is saved to a different offset in the caller's stack frame
 626 //    (Linux: 4(r1), Darwin 8(r1))
 627
 628 static void GNUC3_ATTRIBUTE(used)
 629 StgRunIsImplementedInAssembler(void)
 630 {
 631         __asm__ volatile (
 632                 "\t.globl StgRun\n"
 633                 "\t.type StgRun,@function\n"
 634                 "StgRun:\n"
 635                 "\tmflr 0\n"
 636                 "\tstw 0,4(1)\n"
 637                 "\tmr 5,1\n"
 638                 "\tstwu 1,-%0(1)\n"
 639                 "\tstmw 13,-220(5)\n"
 640                 "\tstfd 14,-144(5)\n"
 641                 "\tstfd 15,-136(5)\n"
 642                 "\tstfd 16,-128(5)\n"
 643                 "\tstfd 17,-120(5)\n"
 644                 "\tstfd 18,-112(5)\n"
 645                 "\tstfd 19,-104(5)\n"
 646                 "\tstfd 20,-96(5)\n"
 647                 "\tstfd 21,-88(5)\n"
 648                 "\tstfd 22,-80(5)\n"
 649                 "\tstfd 23,-72(5)\n"
 650                 "\tstfd 24,-64(5)\n"
 651                 "\tstfd 25,-56(5)\n"
 652                 "\tstfd 26,-48(5)\n"
 653                 "\tstfd 27,-40(5)\n"
 654                 "\tstfd 28,-32(5)\n"
 655                 "\tstfd 29,-24(5)\n"
 656                 "\tstfd 30,-16(5)\n"
 657                 "\tstfd 31,-8(5)\n"
 658                 "\tmr 27,4\n"  // BaseReg == r27
 659                 "\tmtctr 3\n"
 660                 "\tmr 12,3\n"
 661                 "\tbctr\n"
 662                 ".globl StgReturn\n"
 663                 "\t.type StgReturn,@function\n"
 664                 "StgReturn:\n"
 665                 "\tmr 3,14\n"
 666                 "\tla 5,%0(1)\n"
 667                 "\tlmw 13,-220(5)\n"
 668                 "\tlfd 14,-144(5)\n"
 669                 "\tlfd 15,-136(5)\n"
 670                 "\tlfd 16,-128(5)\n"
 671                 "\tlfd 17,-120(5)\n"
 672                 "\tlfd 18,-112(5)\n"
 673                 "\tlfd 19,-104(5)\n"
 674                 "\tlfd 20,-96(5)\n"
 675                 "\tlfd 21,-88(5)\n"
 676                 "\tlfd 22,-80(5)\n"
 677                 "\tlfd 23,-72(5)\n"
 678                 "\tlfd 24,-64(5)\n"
 679                 "\tlfd 25,-56(5)\n"
 680                 "\tlfd 26,-48(5)\n"
 681                 "\tlfd 27,-40(5)\n"
 682                 "\tlfd 28,-32(5)\n"
 683                 "\tlfd 29,-24(5)\n"
 684                 "\tlfd 30,-16(5)\n"
 685                 "\tlfd 31,-8(5)\n"
 686                 "\tmr 1,5\n"
 687                 "\tlwz 0,4(1)\n"
 688                 "\tmtlr 0\n"
 689                 "\tblr\n"
 690         : : "i"(RESERVED_C_STACK_BYTES+224 /*stack frame size*/));
 691 }
 692 #endif
 693
 694 #endif
 695
 696 /* -----------------------------------------------------------------------------
 697    PowerPC 64 architecture
 698
 699    Everything is in assembler, so we don't have to deal with GCC...
 700
 701    -------------------------------------------------------------------------- */
 702
 703 #ifdef powerpc64_HOST_ARCH
 704
 705 #ifdef linux_HOST_OS
 706 extern StgRegTable * StgRun(StgFunPtr f, StgRegTable *basereg);
 707
 708 static void GNUC3_ATTRIBUTE(used)
 709 StgRunIsImplementedInAssembler(void)
 710 {
 711         // r0 volatile
 712         // r1 stack pointer
 713         // r2 toc - needs to be saved
 714         // r3-r10 argument passing, volatile
 715         // r11, r12 very volatile (not saved across cross-module calls)
 716         // r13 thread local state (never modified, don't need to save)
 717         // r14-r31 callee-save
 718         __asm__ volatile (
 719                 ".section \".opd\",\"aw\"\n"
 720                 ".align 3\n"
 721                 ".globl StgRun\n"
 722                 "StgRun:\n"
 723                         "\t.quad\t.StgRun,.TOC.@tocbase,0\n"
 724                         "\t.size StgRun,24\n"
 725                 ".globl StgReturn\n"
 726                 "StgReturn:\n"
 727                         "\t.quad\t.StgReturn,.TOC.@tocbase,0\n"
 728                         "\t.size StgReturn,24\n"
 729                 ".previous\n"
 730                 ".globl .StgRun\n"
 731                 ".type .StgRun,@function\n"
 732                 ".StgRun:\n"
 733                         "\tmflr 0\n"
 734                         "\tmr 5, 1\n"
 735                         "\tstd 0, 16(1)\n"
 736                         "\tstdu 1, -%0(1)\n"
 737                         "\tstd 2, -296(5)\n"
 738                         "\tstd 14, -288(5)\n"
 739                         "\tstd 15, -280(5)\n"
 740                         "\tstd 16, -272(5)\n"
 741                         "\tstd 17, -264(5)\n"
 742                         "\tstd 18, -256(5)\n"
 743                         "\tstd 19, -248(5)\n"
 744                         "\tstd 20, -240(5)\n"
 745                         "\tstd 21, -232(5)\n"
 746                         "\tstd 22, -224(5)\n"
 747                         "\tstd 23, -216(5)\n"
 748                         "\tstd 24, -208(5)\n"
 749                         "\tstd 25, -200(5)\n"
 750                         "\tstd 26, -192(5)\n"
 751                         "\tstd 27, -184(5)\n"
 752                         "\tstd 28, -176(5)\n"
 753                         "\tstd 29, -168(5)\n"
 754                         "\tstd 30, -160(5)\n"
 755                         "\tstd 31, -152(5)\n"
 756                         "\tstfd 14, -144(5)\n"
 757                         "\tstfd 15, -136(5)\n"
 758                         "\tstfd 16, -128(5)\n"
 759                         "\tstfd 17, -120(5)\n"
 760                         "\tstfd 18, -112(5)\n"
 761                         "\tstfd 19, -104(5)\n"
 762                         "\tstfd 20, -96(5)\n"
 763                         "\tstfd 21, -88(5)\n"
 764                         "\tstfd 22, -80(5)\n"
 765                         "\tstfd 23, -72(5)\n"
 766                         "\tstfd 24, -64(5)\n"
 767                         "\tstfd 25, -56(5)\n"
 768                         "\tstfd 26, -48(5)\n"
 769                         "\tstfd 27, -40(5)\n"
 770                         "\tstfd 28, -32(5)\n"
 771                         "\tstfd 29, -24(5)\n"
 772                         "\tstfd 30, -16(5)\n"
 773                         "\tstfd 31, -8(5)\n"
 774                         "\tmr 27, 4\n"  // BaseReg == r27
 775                         "\tld 2, 8(3)\n"
 776                         "\tld 3, 0(3)\n"
 777                         "\tmtctr 3\n"
 778                         "\tbctr\n"
 779                 ".globl .StgReturn\n"
 780                 ".type .StgReturn,@function\n"
 781                 ".StgReturn:\n"
 782                         "\tmr 3,14\n"
 783                         "\tla 5, %0(1)\n" // load address == addi r5, r1, %0
 784                         "\tld 2, -296(5)\n"
 785                         "\tld 14, -288(5)\n"
 786                         "\tld 15, -280(5)\n"
 787                         "\tld 16, -272(5)\n"
 788                         "\tld 17, -264(5)\n"
 789                         "\tld 18, -256(5)\n"
 790                         "\tld 19, -248(5)\n"
 791                         "\tld 20, -240(5)\n"
 792                         "\tld 21, -232(5)\n"
 793                         "\tld 22, -224(5)\n"
 794                         "\tld 23, -216(5)\n"
 795                         "\tld 24, -208(5)\n"
 796                         "\tld 25, -200(5)\n"
 797                         "\tld 26, -192(5)\n"
 798                         "\tld 27, -184(5)\n"
 799                         "\tld 28, -176(5)\n"
 800                         "\tld 29, -168(5)\n"
 801                         "\tld 30, -160(5)\n"
 802                         "\tld 31, -152(5)\n"
 803                         "\tlfd 14, -144(5)\n"
 804                         "\tlfd 15, -136(5)\n"
 805                         "\tlfd 16, -128(5)\n"
 806                         "\tlfd 17, -120(5)\n"
 807                         "\tlfd 18, -112(5)\n"
 808                         "\tlfd 19, -104(5)\n"
 809                         "\tlfd 20, -96(5)\n"
 810                         "\tlfd 21, -88(5)\n"
 811                         "\tlfd 22, -80(5)\n"
 812                         "\tlfd 23, -72(5)\n"
 813                         "\tlfd 24, -64(5)\n"
 814                         "\tlfd 25, -56(5)\n"
 815                         "\tlfd 26, -48(5)\n"
 816                         "\tlfd 27, -40(5)\n"
 817                         "\tlfd 28, -32(5)\n"
 818                         "\tlfd 29, -24(5)\n"
 819                         "\tlfd 30, -16(5)\n"
 820                         "\tlfd 31, -8(5)\n"
 821                         "\tmr 1, 5\n"
 822                         "\tld 0, 16(1)\n"
 823                         "\tmtlr 0\n"
 824                         "\tblr\n"
 825         : : "i"(RESERVED_C_STACK_BYTES+304 /*stack frame size*/));
 826 }
 827 #else // linux_HOST_OS
 828 #error Only linux support for power64 right now.
 829 #endif
 830
 831 #endif
 832
 833 /* -----------------------------------------------------------------------------
 834    IA64 architecture
 835
 836    Again, in assembler - so we can fiddle with the register stack, and because
 837    gcc doesn't handle asm-clobbered callee-saves correctly.
 838
 839    loc0  - loc15: preserved locals
 840    loc16 - loc28: STG registers
 841            loc29: saved ar.pfs
 842            loc30: saved b0
 843            loc31: saved gp (gcc 3.3 uses this slot)
 844    -------------------------------------------------------------------------- */
 845
 846 #ifdef ia64_HOST_ARCH
 847
 848 /* the memory stack is rarely used, so 16K is excessive */
 849 #undef RESERVED_C_STACK_BYTES
 850 #define RESERVED_C_STACK_BYTES 1024
 851
 852 #if ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)) || (__GNUC__ > 3)
 853 /* gcc 3.3+: leave an extra slot for gp saves */
 854 #define LOCALS 32
 855 #else
 856 #define LOCALS 31
 857 #endif
 858
 859 static void GNUC3_ATTRIBUTE(used)
 860 StgRunIsImplementedInAssembler(void)
 861 {
 862     __asm__ volatile(
 863                 ".global StgRun\n"
 864                 "StgRun:\n"
 865                 "\talloc loc29 = ar.pfs, 0, %1, 8, 0\n" /* setup register frame */
 866                 "\tld8 r18 = [r32],8\n"                 /* get procedure address */
 867                 "\tadds sp = -%0, sp ;;\n"              /* setup stack */
 868                 "\tld8 gp = [r32]\n"                    /* get procedure GP */
 869                 "\tadds r16 = %0-(6*16), sp\n"
 870                 "\tadds r17 = %0-(5*16), sp ;;\n"
 871                 "\tstf.spill [r16] = f16,32\n"          /* spill callee-saved fp regs */
 872                 "\tstf.spill [r17] = f17,32\n"
 873                 "\tmov b6 = r18 ;;\n"                   /* set target address */
 874                 "\tstf.spill [r16] = f18,32\n"
 875                 "\tstf.spill [r17] = f19,32\n"
 876                 "\tmov loc30 = b0 ;;\n"                 /* save return address */
 877                 "\tstf.spill [r16] = f20,32\n"
 878                 "\tstf.spill [r17] = f21,32\n"
 879                 "\tbr.few b6 ;;\n"                      /* branch to function */
 880                 ".global StgReturn\n"
 881                 "StgReturn:\n"
 882                 "\tmov r8 = loc16\n"            /* return value in r8 */
 883                 "\tadds r16 = %0-(6*16), sp\n"
 884                 "\tadds r17 = %0-(5*16), sp ;;\n"
 885                 "\tldf.fill f16 = [r16],32\n"   /* start restoring fp regs */
 886                 "\tldf.fill f17 = [r17],32\n"
 887                 "\tmov ar.pfs = loc29 ;;\n"     /* restore register frame */
 888                 "\tldf.fill f18 = [r16],32\n"
 889                 "\tldf.fill f19 = [r17],32\n"
 890                 "\tmov b0 = loc30 ;;\n"         /* restore return address */
 891                 "\tldf.fill f20 = [r16],32\n"
 892                 "\tldf.fill f21 = [r17],32\n"
 893                 "\tadds sp = %0, sp\n"          /* restore stack */
 894                 "\tbr.ret.sptk.many b0 ;;\n"    /* return */
 895         : : "i"(RESERVED_C_STACK_BYTES + 6*16), "i"(LOCALS));
 896 }
 897
 898 #endif
 899
 900 #endif /* !USE_MINIINTERPRETER */