sysdeps/unix/sysv/linux/hppa/sysdep.h

   1 /* Assembler macros for PA-RISC.
   2    Copyright (C) 1999, 2001, 2002, 2003, 2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
   6    Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, write to the Free
  20    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21    02111-1307 USA.  */
  22
  23 #include <asm/unistd.h>
  24 #include <sysdeps/generic/sysdep.h>
  25 #include <sys/syscall.h>
  26
  27 #undef ASM_LINE_SEP
  28 #define ASM_LINE_SEP !
  29
  30 #undef SYS_ify
  31 #define SYS_ify(syscall_name)   (__NR_##syscall_name)
  32
  33 /* WARNING: TREG must be a callee saves register so
  34    that it doesn't have to be restored after a call
  35    to another function */
  36 #ifdef PIC
  37 # define TREG %r3
  38 # define SAVE_PIC(SREG) copy %r19, SREG ASM_LINE_SEP
  39 # define LOAD_PIC(LREG) copy LREG, %r19 ASM_LINE_SEP
  40 /* Inline assembly defines */
  41 # define TREG_ASM "%r4" /* Cant clobber r3, it holds framemarker */
  42 # define SAVE_ASM_PIC   "       copy %%r19, %" TREG_ASM "\n"
  43 # define LOAD_ASM_PIC   "       copy %" TREG_ASM ", %%r19\n"
  44 # define CLOB_TREG      TREG_ASM ,
  45 # define PIC_REG_DEF    register unsigned long __r19 asm("r19");
  46 # define PIC_REG_USE    , "r" (__r19)
  47 #else
  48 # define TREG %r3
  49 # define SAVE_PIC(SREG) nop ASM_LINE_SEP
  50 # define LOAD_PIC(LREG) nop ASM_LINE_SEP
  51 /* Inline assembly defines */
  52 # define TREG_ASM
  53 # define SAVE_ASM_PIC   "nop \n"
  54 # define LOAD_ASM_PIC   "nop \n"
  55 # define CLOB_TREG
  56 # define PIC_REG_DEF
  57 # define PIC_REG_USE
  58 #endif
  59
  60 #ifdef __ASSEMBLER__
  61
  62 /* Syntactic details of assembler.  */
  63
  64 #define ALIGNARG(log2) log2
  65
  66 /* For Linux we can use the system call table in the header file
  67         /usr/include/asm/unistd.h
  68    of the kernel.  But these symbols do not follow the SYS_* syntax
  69    so we have to redefine the `SYS_ify' macro here.  */
  70 #undef SYS_ify
  71 #define SYS_ify(syscall_name)   __NR_##syscall_name
  72
  73 /* ELF-like local names start with `.L'.  */
  74 #undef L
  75 #define L(name) .L##name
  76
  77 /* Linux uses a negative return value to indicate syscall errors,
  78    unlike most Unices, which use the condition codes' carry flag.
  79
  80    Since version 2.1 the return value of a system call might be
  81    negative even if the call succeeded.  E.g., the `lseek' system call
  82    might return a large offset.  Therefore we must not anymore test
  83    for < 0, but test for a real error by making sure the value in %eax
  84    is a real error number.  Linus said he will make sure the no syscall
  85    returns a value in -1 .. -4095 as a valid result so we can safely
  86    test with -4095.  */
  87
  88 /* We don't want the label for the error handle to be global when we define
  89    it here.  */
  90 /*#ifdef PIC
  91 # define SYSCALL_ERROR_LABEL 0f
  92 #else
  93 # define SYSCALL_ERROR_LABEL syscall_error
  94 #endif*/
  95
  96 /* Argument manipulation from the stack for preparing to
  97    make a syscall */
  98
  99 #define DOARGS_0 /* nothing */
 100 #define DOARGS_1 /* nothing */
 101 #define DOARGS_2 /* nothing */
 102 #define DOARGS_3 /* nothing */
 103 #define DOARGS_4 /* nothing */
 104 #define DOARGS_5 ldw -52(%sp), %r22             ASM_LINE_SEP
 105 #define DOARGS_6 DOARGS_5 ldw -56(%sp), %r21    ASM_LINE_SEP
 106
 107 #define UNDOARGS_0 /* nothing */
 108 #define UNDOARGS_1 /* nothing */
 109 #define UNDOARGS_2 /* nothing */
 110 #define UNDOARGS_3 /* nothing */
 111 #define UNDOARGS_4 /* nothing */
 112 #define UNDOARGS_5 /* nothing */
 113 #define UNDOARGS_6 /* nothing */
 114
 115 /* Define an entry point visible from C.
 116
 117    There is currently a bug in gdb which prevents us from specifying
 118    incomplete stabs information.  Fake some entries here which specify
 119    the current source file.  */
 120 #define ENTRY(name)                                                     \
 121         .text                                           ASM_LINE_SEP    \
 122         .align ALIGNARG(4)                              ASM_LINE_SEP    \
 123         .export C_SYMBOL_NAME(name)                     ASM_LINE_SEP    \
 124         .type   C_SYMBOL_NAME(name),@function           ASM_LINE_SEP    \
 125         C_LABEL(name)                                   ASM_LINE_SEP    \
 126         .PROC                                           ASM_LINE_SEP    \
 127         .CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=3     ASM_LINE_SEP    \
 128         .ENTRY                                          ASM_LINE_SEP    \
 129         /* SAVE_RP says we do */                        ASM_LINE_SEP    \
 130         stw %rp, -20(%sr0,%sp)                          ASM_LINE_SEP    \
 131         /*FIXME: Call mcount? (carefull with stack!) */
 132
 133 /* Some syscall wrappers do not call other functions, and
 134    hence are classified as leaf, so add NO_CALLS for gdb */
 135 #define ENTRY_LEAF(name)                                                \
 136         .text                                           ASM_LINE_SEP    \
 137         .align ALIGNARG(4)                              ASM_LINE_SEP    \
 138         .export C_SYMBOL_NAME(name)                     ASM_LINE_SEP    \
 139         .type   C_SYMBOL_NAME(name),@function           ASM_LINE_SEP    \
 140         C_LABEL(name)                                   ASM_LINE_SEP    \
 141         .PROC                                           ASM_LINE_SEP    \
 142         .CALLINFO FRAME=64,NO_CALLS,SAVE_RP,ENTRY_GR=3  ASM_LINE_SEP    \
 143         .ENTRY                                          ASM_LINE_SEP    \
 144         /* SAVE_RP says we do */                        ASM_LINE_SEP    \
 145         stw %rp, -20(%sr0,%sp)                          ASM_LINE_SEP    \
 146         /*FIXME: Call mcount? (carefull with stack!) */
 147
 148 #undef  END
 149 #define END(name)                                                       \
 150         .EXIT                                           ASM_LINE_SEP    \
 151         .PROCEND                                        ASM_LINE_SEP    \
 152 .size   C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name)      ASM_LINE_SEP
 153
 154 /* If compiled for profiling, call `mcount' at the start
 155    of each function. No, don't bother.  gcc will put the
 156    call in for us.  */
 157 #define CALL_MCOUNT             /* Do nothing.  */
 158
 159 /* syscall wrappers consist of
 160         #include <sysdep.h>
 161         PSEUDO(...)
 162         ret
 163         PSEUDO_END(...)
 164
 165    which means
 166         ENTRY(name)
 167         DO_CALL(...)
 168         nop
 169         bv 0(2)
 170         nop
 171 */
 172
 173 #define PSEUDO(name, syscall_name, args)                        \
 174   ENTRY (name)                                  ASM_LINE_SEP    \
 175   /* If necc. load args from stack */           ASM_LINE_SEP    \
 176   DOARGS_##args                                 ASM_LINE_SEP    \
 177   DO_CALL (syscall_name, args)                  ASM_LINE_SEP    \
 178   UNDOARGS_##args                               ASM_LINE_SEP    \
 179   nop                                           ASM_LINE_SEP
 180
 181 #define ret \
 182   /* Return value set by ERRNO code */          ASM_LINE_SEP    \
 183   bv,n 0(2)                                     ASM_LINE_SEP
 184
 185 #undef  PSEUDO_END
 186 #define PSEUDO_END(name)                                        \
 187   END (name)
 188
 189 /* We don't set the errno on the return from the syscall */
 190 #define PSEUDO_NOERRNO(name, syscall_name, args)                \
 191   ENTRY_LEAF (name)                             ASM_LINE_SEP    \
 192   DOARGS_##args                                 ASM_LINE_SEP    \
 193   DO_CALL_NOERRNO (syscall_name, args)          ASM_LINE_SEP    \
 194   UNDOARGS_##args                               ASM_LINE_SEP    \
 195   nop                                           ASM_LINE_SEP
 196
 197 #define ret_NOERRNO ret
 198
 199 #undef  PSEUDO_END_NOERRNO
 200 #define PSEUDO_END_NOERRNO(name)                                \
 201   END (name)
 202
 203 /* This has to return the error value */
 204 #undef  PSEUDO_ERRVAL
 205 #define PSEUDO_ERRVAL(name, syscall_name, args)                 \
 206   ENTRY_LEAF (name)                             ASM_LINE_SEP    \
 207   DOARGS_##args                                 ASM_LINE_SEP    \
 208   DO_CALL_ERRVAL (syscall_name, args)           ASM_LINE_SEP    \
 209   UNDOARGS_##args                               ASM_LINE_SEP    \
 210   nop                                           ASM_LINE_SEP
 211
 212 #define ret_ERRVAL ret
 213
 214 #undef  PSEUDO_END_ERRVAL
 215 #define PSEUDO_END_ERRVAL(name)                                 \
 216         END(name)
 217
 218 #undef JUMPTARGET
 219 #define JUMPTARGET(name)        name
 220 #define SYSCALL_PIC_SETUP       /* Nothing.  */
 221
 222
 223 /* FIXME: This comment is not true.
 224  * All the syscall assembly macros rely on finding the approriate
 225    SYSCALL_ERROR_LABEL or rather HANDLER. */
 226
 227 /* int * __errno_location(void) so you have to store your value
 228    into the return address! */
 229 #define DEFAULT_SYSCALL_ERROR_HANDLER                   \
 230         .import __errno_location,code   ASM_LINE_SEP    \
 231         /* branch to errno handler */   ASM_LINE_SEP    \
 232         bl __errno_location,%rp         ASM_LINE_SEP
 233
 234 /* Here are the myriad of configuration options that the above can
 235    work for... what we've done is provide the framework for future
 236    changes if required to each section */
 237
 238 #ifdef PIC
 239 # if RTLD_PRIVATE_ERRNO
 240 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 241 # else /* !RTLD_PRIVATE_ERRNO */
 242 #  if defined _LIBC_REENTRANT
 243 #   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 244 #  else /* !_LIBC_REENTRANT */
 245 #   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 246 #  endif /* _LIBC_REENTRANT */
 247 # endif /* RTLD_PRIVATE_ERRNO */
 248 #else
 249 # ifndef _LIBC_REENTRANT
 250 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 251 # else
 252 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 253 # endif
 254 #endif
 255
 256
 257 /* Linux takes system call arguments in registers:
 258         syscall number  gr20
 259         arg 1           gr26
 260         arg 2           gr25
 261         arg 3           gr24
 262         arg 4           gr23
 263         arg 5           gr22
 264         arg 6           gr21
 265
 266    The compiler calls us by the C convention:
 267         syscall number  in the DO_CALL macro
 268         arg 1           gr26
 269         arg 2           gr25
 270         arg 3           gr24
 271         arg 4           gr23
 272         arg 5           -52(sp)
 273         arg 6           -56(sp)
 274
 275    gr22 and gr21 are caller-saves, so we can just load the arguments
 276    there and generally be happy. */
 277
 278 /* the cmpb...no_error code below inside DO_CALL
 279  * is intended to mimic the if (__sys_res...)
 280  * code inside INLINE_SYSCALL
 281  */
 282 #define NO_ERROR -0x1000
 283
 284 #undef  DO_CALL
 285 #define DO_CALL(syscall_name, args)                             \
 286         /* Create a frame */                    ASM_LINE_SEP    \
 287         stwm TREG, 64(%sp)                      ASM_LINE_SEP    \
 288         stw %sp, -4(%sp)                        ASM_LINE_SEP    \
 289         stw %r19, -32(%sp)                      ASM_LINE_SEP    \
 290         /* Save r19 */                          ASM_LINE_SEP    \
 291         SAVE_PIC(TREG)                          ASM_LINE_SEP    \
 292         /* Do syscall, delay loads # */         ASM_LINE_SEP    \
 293         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 294         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 295         ldi NO_ERROR,%r1                        ASM_LINE_SEP    \
 296         cmpb,>>=,n %r1,%ret0,L(pre_end)         ASM_LINE_SEP    \
 297         /* Restore r19 from TREG */             ASM_LINE_SEP    \
 298         LOAD_PIC(TREG) /* delay */              ASM_LINE_SEP    \
 299         SYSCALL_ERROR_HANDLER                   ASM_LINE_SEP    \
 300         /* Use TREG for temp storage */         ASM_LINE_SEP    \
 301         copy %ret0, TREG /* delay */            ASM_LINE_SEP    \
 302         /* OPTIMIZE: Don't reload r19 */        ASM_LINE_SEP    \
 303         /* do a -1*syscall_ret0 */              ASM_LINE_SEP    \
 304         sub %r0, TREG, TREG                     ASM_LINE_SEP    \
 305         /* Store into errno location */         ASM_LINE_SEP    \
 306         stw TREG, 0(%sr0,%ret0)                 ASM_LINE_SEP    \
 307         /* return -1 as error */                ASM_LINE_SEP    \
 308         ldo -1(%r0), %ret0                      ASM_LINE_SEP    \
 309 L(pre_end):                                     ASM_LINE_SEP    \
 310         /* Restore our frame, restoring TREG */ ASM_LINE_SEP    \
 311         ldwm -64(%sp), TREG                     ASM_LINE_SEP    \
 312         /* Restore return pointer */            ASM_LINE_SEP    \
 313         ldw -20(%sp),%rp                        ASM_LINE_SEP
 314
 315 /* We do nothing with the return, except hand it back to someone else */
 316 #undef  DO_CALL_NOERRNO
 317 #define DO_CALL_NOERRNO(syscall_name, args)                     \
 318         /* No need to store r19 */              ASM_LINE_SEP    \
 319         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 320         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 321         /* Caller will restore r19 */           ASM_LINE_SEP
 322
 323 /* Here, we return the ERRVAL in assembly, note we don't call the
 324    error handler function, but we do 'negate' the return _IF_
 325    it's an error. Not sure if this is the right semantic. */
 326
 327 #undef  DO_CALL_ERRVAL
 328 #define DO_CALL_ERRVAL(syscall_name, args)                      \
 329         /* No need to store r19 */              ASM_LINE_SEP    \
 330         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 331         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 332         /* Caller will restore r19 */           ASM_LINE_SEP    \
 333         ldi NO_ERROR,%r1                        ASM_LINE_SEP    \
 334         cmpb,>>=,n %r1,%ret0,0f                 ASM_LINE_SEP    \
 335         sub %r0, %ret0, %ret0                   ASM_LINE_SEP    \
 336 0:                                              ASM_LINE_SEP
 337
 338
 339 #else
 340
 341 /* GCC has to be warned that a syscall may clobber all the ABI
 342    registers listed as "caller-saves", see page 8, Table 2
 343    in section 2.2.6 of the PA-RISC RUN-TIME architecture
 344    document. However! r28 is the result and will conflict with
 345    the clobber list so it is left out. Also the input arguments
 346    registers r20 -> r26 will conflict with the list so they
 347    are treated specially. Although r19 is clobbered by the syscall
 348    we cannot say this because it would violate ABI, thus we say
 349    TREG is clobbered and use that register to save/restore r19
 350    across the syscall. */
 351
 352 #define CALL_CLOB_REGS  "%r1", "%r2", CLOB_TREG \
 353                         "%r20", "%r29", "%r31"
 354
 355 #undef INLINE_SYSCALL
 356 #define INLINE_SYSCALL(name, nr, args...)                               \
 357 ({                                                                      \
 358         long __sys_res;                                                 \
 359         {                                                               \
 360                 register unsigned long __res asm("r28");                \
 361                 PIC_REG_DEF                                             \
 362                 LOAD_ARGS_##nr(args)                                    \
 363                 /* FIXME: HACK save/load r19 around syscall */          \
 364                 asm volatile(                                           \
 365                         SAVE_ASM_PIC                                    \
 366                         "       ble  0x100(%%sr2, %%r0)\n"              \
 367                         "       ldi %1, %%r20\n"                        \
 368                         LOAD_ASM_PIC                                    \
 369                         : "=r" (__res)                                  \
 370                         : "i" (SYS_ify(name)) PIC_REG_USE ASM_ARGS_##nr \
 371                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 372                 );                                                      \
 373                 __sys_res = (long)__res;                                \
 374         }                                                               \
 375         if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){        \
 376                 __set_errno(-__sys_res);                                \
 377                 __sys_res = -1;                                         \
 378         }                                                               \
 379         __sys_res;                                                      \
 380 })
 381
 382 /* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
 383    value to use within the context of the syscall
 384    INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
 385    You are allowed to use the syscall result (val) and the DECL error
 386    variable to determine what went wrong.
 387    INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
 388    In our case we just flip the sign. */
 389
 390 #undef INTERNAL_SYSCALL_DECL
 391 #define INTERNAL_SYSCALL_DECL(err)
 392
 393 #undef INTERNAL_SYSCALL_ERROR_P
 394 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
 395         ((val < 0) && (val > -4095))
 396
 397 #undef INTERNAL_SYSCALL_ERRNO
 398 #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
 399
 400 /* Similar to INLINE_SYSCALL but we don't set errno */
 401 #undef INTERNAL_SYSCALL
 402 #define INTERNAL_SYSCALL(name, err, nr, args...)                        \
 403 ({                                                                      \
 404         long __sys_res;                                                 \
 405         {                                                               \
 406                 register unsigned long __res asm("r28");                \
 407                 PIC_REG_DEF                                             \
 408                 LOAD_ARGS_##nr(args)                                    \
 409                 /* FIXME: HACK save/load r19 around syscall */          \
 410                 asm volatile(                                           \
 411                         SAVE_ASM_PIC                                    \
 412                         "       ble  0x100(%%sr2, %%r0)\n"              \
 413                         "       ldi %1, %%r20\n"                        \
 414                         LOAD_ASM_PIC                                    \
 415                         : "=r" (__res)                                  \
 416                         : "i" (SYS_ify(name)) PIC_REG_USE ASM_ARGS_##nr \
 417                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 418                 );                                                      \
 419                 __sys_res = (long)__res;                                \
 420         }                                                               \
 421         __sys_res;                                                      \
 422  })
 423
 424
 425 /* The _NCS variant allows non-constant syscall numbers.  */
 426 #undef INTERNAL_SYSCALL_NCS
 427 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                    \
 428 ({                                                                      \
 429         long __sys_res;                                                 \
 430         {                                                               \
 431                 register unsigned long __res asm("r28");                \
 432                 PIC_REG_DEF                                             \
 433                 LOAD_ARGS_##nr(args)                                    \
 434                 /* FIXME: HACK save/load r19 around syscall */          \
 435                 asm volatile(                                           \
 436                         SAVE_ASM_PIC                                    \
 437                         "       ble  0x100(%%sr2, %%r0)\n"              \
 438                         "       copy %1, %%r20\n"                       \
 439                         LOAD_ASM_PIC                                    \
 440                         : "=r" (__res)                                  \
 441                         : "r" (name) PIC_REG_USE ASM_ARGS_##nr          \
 442                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 443                 );                                                      \
 444                 __sys_res = (long)__res;                                \
 445         }                                                               \
 446         __sys_res;                                                      \
 447  })
 448
 449
 450
 451 #define LOAD_ARGS_0()
 452 #define LOAD_ARGS_1(r26)                                                \
 453   register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);   \
 454   LOAD_ARGS_0()
 455 #define LOAD_ARGS_2(r26,r25)                                            \
 456   register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);   \
 457   LOAD_ARGS_1(r26)
 458 #define LOAD_ARGS_3(r26,r25,r24)                                        \
 459   register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);   \
 460   LOAD_ARGS_2(r26,r25)
 461 #define LOAD_ARGS_4(r26,r25,r24,r23)                                    \
 462   register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);   \
 463   LOAD_ARGS_3(r26,r25,r24)
 464 #define LOAD_ARGS_5(r26,r25,r24,r23,r22)                                \
 465   register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);   \
 466   LOAD_ARGS_4(r26,r25,r24,r23)
 467 #define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)                            \
 468   register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);   \
 469   LOAD_ARGS_5(r26,r25,r24,r23,r22)
 470
 471 /* Even with zero args we use r20 for the syscall number */
 472 #define ASM_ARGS_0
 473 #define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
 474 #define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
 475 #define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
 476 #define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
 477 #define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
 478 #define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
 479
 480 /* The registers not listed as inputs but clobbered */
 481 #define CLOB_ARGS_6
 482 #define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
 483 #define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
 484 #define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
 485 #define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
 486 #define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
 487 #define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
 488
 489 #endif  /* __ASSEMBLER__ */
 490
 491 /* Pointer mangling is not yet supported for HPPA.  */
 492 #define PTR_MANGLE(var) (void) (var)
 493 #define PTR_DEMANGLE(var) (void) (var)
 494