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

   1 /* Assembler macros for PA-RISC.
   2    Copyright (C) 1999-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
   5    Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library.  If not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <asm/unistd.h>
  22 #include <sysdeps/generic/sysdep.h>
  23
  24 /* In order to get __set_errno() definition in INLINE_SYSCALL.  */
  25 #ifndef __ASSEMBLER__
  26 #include <errno.h>
  27 #endif
  28
  29 #undef ASM_LINE_SEP
  30 #define ASM_LINE_SEP !
  31
  32 #undef SYS_ify
  33 #define SYS_ify(syscall_name)   (__NR_##syscall_name)
  34
  35 /* The vfork, fork, and clone syscalls clobber r19
  36  * and r21. We list r21 as either clobbered or as an
  37  * input to a 6-argument syscall. We must save and
  38  * restore r19 in both PIC and non-PIC cases.
  39  */
  40 /* WARNING: TREG must be a callee saves register so
  41    that it doesn't have to be restored after a call
  42    to another function */
  43 #define TREG 4
  44 #define SAVE_PIC(SREG) \
  45         copy %r19, SREG ASM_LINE_SEP    \
  46         .cfi_register 19, SREG
  47 #define LOAD_PIC(LREG) \
  48         copy LREG , %r19 ASM_LINE_SEP   \
  49         .cfi_restore 19
  50 /* Inline assembly defines */
  51 #define TREG_ASM "%r4" /* Cant clobber r3, it holds framemarker */
  52 #define SAVE_ASM_PIC    "       copy %%r19, %" TREG_ASM "\n"
  53 #define LOAD_ASM_PIC    "       copy %" TREG_ASM ", %%r19\n"
  54 #define CLOB_TREG       TREG_ASM ,
  55 #define PIC_REG_DEF     register unsigned long __r19 asm("r19");
  56 #define PIC_REG_USE     , "r" (__r19)
  57
  58 #ifdef __ASSEMBLER__
  59
  60 /* Syntactic details of assembler.  */
  61
  62 #define ALIGNARG(log2) log2
  63
  64 /* For Linux we can use the system call table in the header file
  65         /usr/include/asm/unistd.h
  66    of the kernel.  But these symbols do not follow the SYS_* syntax
  67    so we have to redefine the `SYS_ify' macro here.  */
  68 #undef SYS_ify
  69 #define SYS_ify(syscall_name)   __NR_##syscall_name
  70
  71 /* ELF-like local names start with `.L'.  */
  72 #undef L
  73 #define L(name) .L##name
  74
  75 /* Linux uses a negative return value to indicate syscall errors,
  76    unlike most Unices, which use the condition codes' carry flag.
  77
  78    Since version 2.1 the return value of a system call might be
  79    negative even if the call succeeded.  E.g., the `lseek' system call
  80    might return a large offset.  Therefore we must not anymore test
  81    for < 0, but test for a real error by making sure the value in %eax
  82    is a real error number.  Linus said he will make sure the no syscall
  83    returns a value in -1 .. -4095 as a valid result so we can safely
  84    test with -4095.  */
  85
  86 /* We don't want the label for the error handle to be global when we define
  87    it here.  */
  88 /*#ifdef PIC
  89 # define SYSCALL_ERROR_LABEL 0f
  90 #else
  91 # define SYSCALL_ERROR_LABEL syscall_error
  92 #endif*/
  93
  94 /* Argument manipulation from the stack for preparing to
  95    make a syscall */
  96
  97 #define DOARGS_0 /* nothing */
  98 #define DOARGS_1 /* nothing */
  99 #define DOARGS_2 /* nothing */
 100 #define DOARGS_3 /* nothing */
 101 #define DOARGS_4 /* nothing */
 102 #define DOARGS_5 ldw -52(%sp), %r22             ASM_LINE_SEP
 103 #define DOARGS_6 DOARGS_5 ldw -56(%sp), %r21    ASM_LINE_SEP
 104
 105 #define UNDOARGS_0 /* nothing */
 106 #define UNDOARGS_1 /* nothing */
 107 #define UNDOARGS_2 /* nothing */
 108 #define UNDOARGS_3 /* nothing */
 109 #define UNDOARGS_4 /* nothing */
 110 #define UNDOARGS_5 /* nothing */
 111 #define UNDOARGS_6 /* nothing */
 112
 113 /* Define an entry point visible from C.
 114
 115    There is currently a bug in gdb which prevents us from specifying
 116    incomplete stabs information.  Fake some entries here which specify
 117    the current source file.  */
 118 #define ENTRY(name)                                                     \
 119         .text                                           ASM_LINE_SEP    \
 120         .align ALIGNARG(4)                              ASM_LINE_SEP    \
 121         .export C_SYMBOL_NAME(name)                     ASM_LINE_SEP    \
 122         .type   C_SYMBOL_NAME(name),@function           ASM_LINE_SEP    \
 123         cfi_startproc                                   ASM_LINE_SEP    \
 124         C_LABEL(name)                                   ASM_LINE_SEP    \
 125         .PROC                                           ASM_LINE_SEP    \
 126         .CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=3     ASM_LINE_SEP    \
 127         .ENTRY                                          ASM_LINE_SEP    \
 128         /* SAVE_RP says we do */                        ASM_LINE_SEP    \
 129         stw %rp, -20(%sr0,%sp)                          ASM_LINE_SEP    \
 130         .cfi_offset 2, -20                              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         cfi_startproc                                   ASM_LINE_SEP    \
 141         C_LABEL(name)                                   ASM_LINE_SEP    \
 142         .PROC                                           ASM_LINE_SEP    \
 143         .CALLINFO FRAME=64,NO_CALLS,SAVE_RP,ENTRY_GR=3  ASM_LINE_SEP    \
 144         .ENTRY                                          ASM_LINE_SEP    \
 145         /* SAVE_RP says we do */                        ASM_LINE_SEP    \
 146         stw %rp, -20(%sr0,%sp)                          ASM_LINE_SEP    \
 147         .cfi_offset 2, -20                              ASM_LINE_SEP    \
 148         /*FIXME: Call mcount? (carefull with stack!) */
 149
 150 #undef  END
 151 #define END(name)                                                       \
 152         .EXIT                                           ASM_LINE_SEP    \
 153         .PROCEND                                        ASM_LINE_SEP    \
 154         cfi_endproc                                     ASM_LINE_SEP    \
 155 .size   C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name)      ASM_LINE_SEP
 156
 157 /* If compiled for profiling, call `mcount' at the start
 158    of each function. No, don't bother.  gcc will put the
 159    call in for us.  */
 160 #define CALL_MCOUNT             /* Do nothing.  */
 161
 162 /* syscall wrappers consist of
 163         #include <sysdep.h>
 164         PSEUDO(...)
 165         ret
 166         PSEUDO_END(...)
 167
 168    which means
 169         ENTRY(name)
 170         DO_CALL(...)
 171         bv,n 0(2)
 172 */
 173
 174 #define PSEUDO(name, syscall_name, args)                        \
 175   ENTRY (name)                                  ASM_LINE_SEP    \
 176   /* If necc. load args from stack */           ASM_LINE_SEP    \
 177   DOARGS_##args                                 ASM_LINE_SEP    \
 178   DO_CALL (syscall_name, args)                  ASM_LINE_SEP    \
 179   UNDOARGS_##args                               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
 196 #define ret_NOERRNO ret
 197
 198 #undef  PSEUDO_END_NOERRNO
 199 #define PSEUDO_END_NOERRNO(name)                                \
 200   END (name)
 201
 202 /* This has to return the error value */
 203 #undef  PSEUDO_ERRVAL
 204 #define PSEUDO_ERRVAL(name, syscall_name, args)                 \
 205   ENTRY_LEAF (name)                             ASM_LINE_SEP    \
 206   DOARGS_##args                                 ASM_LINE_SEP    \
 207   DO_CALL_ERRVAL (syscall_name, args)           ASM_LINE_SEP    \
 208   UNDOARGS_##args                               ASM_LINE_SEP
 209
 210 #define ret_ERRVAL ret
 211
 212 #undef  PSEUDO_END_ERRVAL
 213 #define PSEUDO_END_ERRVAL(name)                                 \
 214         END(name)
 215
 216 #undef JUMPTARGET
 217 #define JUMPTARGET(name)        name
 218 #define SYSCALL_PIC_SETUP       /* Nothing.  */
 219
 220
 221 /* FIXME: This comment is not true.
 222  * All the syscall assembly macros rely on finding the appropriate
 223    SYSCALL_ERROR_LABEL or rather HANDLER. */
 224
 225 /* int * __errno_location(void) so you have to store your value
 226    into the return address! */
 227 #define DEFAULT_SYSCALL_ERROR_HANDLER                   \
 228         .import __errno_location,code   ASM_LINE_SEP    \
 229         /* branch to errno handler */   ASM_LINE_SEP    \
 230         bl __errno_location,%rp         ASM_LINE_SEP
 231
 232 /* Here are the myriad of configuration options that the above can
 233    work for... what we've done is provide the framework for future
 234    changes if required to each section */
 235
 236 #ifdef PIC
 237 # if RTLD_PRIVATE_ERRNO
 238 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 239 # else /* !RTLD_PRIVATE_ERRNO */
 240 #  if defined _LIBC_REENTRANT
 241 #   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 242 #  else /* !_LIBC_REENTRANT */
 243 #   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 244 #  endif /* _LIBC_REENTRANT */
 245 # endif /* RTLD_PRIVATE_ERRNO */
 246 #else
 247 # ifndef _LIBC_REENTRANT
 248 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 249 # else
 250 #  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
 251 # endif
 252 #endif
 253
 254
 255 /* Linux takes system call arguments in registers:
 256         syscall number  gr20
 257         arg 1           gr26
 258         arg 2           gr25
 259         arg 3           gr24
 260         arg 4           gr23
 261         arg 5           gr22
 262         arg 6           gr21
 263
 264    The compiler calls us by the C convention:
 265         syscall number  in the DO_CALL macro
 266         arg 1           gr26
 267         arg 2           gr25
 268         arg 3           gr24
 269         arg 4           gr23
 270         arg 5           -52(sp)
 271         arg 6           -56(sp)
 272
 273    gr22 and gr21 are caller-saves, so we can just load the arguments
 274    there and generally be happy. */
 275
 276 /* the cmpb...no_error code below inside DO_CALL
 277  * is intended to mimic the if (__sys_res...)
 278  * code inside INLINE_SYSCALL
 279  */
 280 #define NO_ERROR -0x1000
 281
 282 #undef  DO_CALL
 283 #define DO_CALL(syscall_name, args)                             \
 284         /* Create a frame */                    ASM_LINE_SEP    \
 285         stwm TREG, 64(%sp)                      ASM_LINE_SEP    \
 286         .cfi_offset TREG, 0                     ASM_LINE_SEP    \
 287         .cfi_adjust_cfa_offset 64               ASM_LINE_SEP    \
 288         stw %sp, -4(%sp)                        ASM_LINE_SEP    \
 289         .cfi_offset 30, -4                      ASM_LINE_SEP    \
 290         stw %r19, -32(%sp)                      ASM_LINE_SEP    \
 291         .cfi_offset 19, -32                     ASM_LINE_SEP    \
 292         /* Save r19 */                          ASM_LINE_SEP    \
 293         SAVE_PIC(TREG)                          ASM_LINE_SEP    \
 294         /* Do syscall, delay loads # */         ASM_LINE_SEP    \
 295         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 296         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 297         ldi NO_ERROR,%r1                        ASM_LINE_SEP    \
 298         cmpb,>>=,n %r1,%ret0,L(pre_end)         ASM_LINE_SEP    \
 299         /* Restore r19 from TREG */             ASM_LINE_SEP    \
 300         LOAD_PIC(TREG) /* delay */              ASM_LINE_SEP    \
 301         SYSCALL_ERROR_HANDLER                   ASM_LINE_SEP    \
 302         /* Use TREG for temp storage */         ASM_LINE_SEP    \
 303         copy %ret0, TREG /* delay */            ASM_LINE_SEP    \
 304         /* OPTIMIZE: Don't reload r19 */        ASM_LINE_SEP    \
 305         /* do a -1*syscall_ret0 */              ASM_LINE_SEP    \
 306         sub %r0, TREG, TREG                     ASM_LINE_SEP    \
 307         /* Store into errno location */         ASM_LINE_SEP    \
 308         stw TREG, 0(%sr0,%ret0)                 ASM_LINE_SEP    \
 309         /* return -1 as error */                ASM_LINE_SEP    \
 310         ldo -1(%r0), %ret0                      ASM_LINE_SEP    \
 311 L(pre_end):                                     ASM_LINE_SEP    \
 312         /* Restore our frame, restoring TREG */ ASM_LINE_SEP    \
 313         ldwm -64(%sp), TREG                     ASM_LINE_SEP    \
 314         .cfi_adjust_cfa_offset -64              ASM_LINE_SEP    \
 315         /* Restore return pointer */            ASM_LINE_SEP    \
 316         ldw -20(%sp),%rp                        ASM_LINE_SEP    \
 317         .cfi_restore 2                          ASM_LINE_SEP
 318
 319 /* We do nothing with the return, except hand it back to someone else */
 320 #undef  DO_CALL_NOERRNO
 321 #define DO_CALL_NOERRNO(syscall_name, args)                     \
 322         /* No need to store r19 */              ASM_LINE_SEP    \
 323         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 324         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 325         /* Caller will restore r19 */           ASM_LINE_SEP
 326
 327 /* Here, we return the ERRVAL in assembly, note we don't call the
 328    error handler function, but we do 'negate' the return _IF_
 329    it's an error. Not sure if this is the right semantic. */
 330
 331 #undef  DO_CALL_ERRVAL
 332 #define DO_CALL_ERRVAL(syscall_name, args)                      \
 333         /* No need to store r19 */              ASM_LINE_SEP    \
 334         ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
 335         ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
 336         /* Caller will restore r19 */           ASM_LINE_SEP    \
 337         ldi NO_ERROR,%r1                        ASM_LINE_SEP    \
 338         cmpb,>>=,n %r1,%ret0,0f                 ASM_LINE_SEP    \
 339         sub %r0, %ret0, %ret0                   ASM_LINE_SEP    \
 340 0:                                              ASM_LINE_SEP
 341
 342
 343 #else
 344
 345 /* GCC has to be warned that a syscall may clobber all the ABI
 346    registers listed as "caller-saves", see page 8, Table 2
 347    in section 2.2.6 of the PA-RISC RUN-TIME architecture
 348    document. However! r28 is the result and will conflict with
 349    the clobber list so it is left out. Also the input arguments
 350    registers r20 -> r26 will conflict with the list so they
 351    are treated specially. Although r19 is clobbered by the syscall
 352    we cannot say this because it would violate ABI, thus we say
 353    TREG is clobbered and use that register to save/restore r19
 354    across the syscall. */
 355
 356 #define CALL_CLOB_REGS  "%r1", "%r2", CLOB_TREG \
 357                         "%r20", "%r29", "%r31"
 358
 359 #undef INLINE_SYSCALL
 360 #define INLINE_SYSCALL(name, nr, args...)                               \
 361 ({                                                                      \
 362         long __sys_res;                                                 \
 363         {                                                               \
 364                 register unsigned long __res asm("r28");                \
 365                 PIC_REG_DEF                                             \
 366                 LOAD_ARGS_##nr(args)                                    \
 367                 /* FIXME: HACK save/load r19 around syscall */          \
 368                 asm volatile(                                           \
 369                         SAVE_ASM_PIC                                    \
 370                         "       ble  0x100(%%sr2, %%r0)\n"              \
 371                         "       ldi %1, %%r20\n"                        \
 372                         LOAD_ASM_PIC                                    \
 373                         : "=r" (__res)                                  \
 374                         : "i" (SYS_ify(name)) PIC_REG_USE ASM_ARGS_##nr \
 375                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 376                 );                                                      \
 377                 __sys_res = (long)__res;                                \
 378         }                                                               \
 379         if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){        \
 380                 __set_errno(-__sys_res);                                \
 381                 __sys_res = -1;                                         \
 382         }                                                               \
 383         __sys_res;                                                      \
 384 })
 385
 386 /* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
 387    value to use within the context of the syscall
 388    INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
 389    You are allowed to use the syscall result (val) and the DECL error
 390    variable to determine what went wrong.
 391    INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
 392    In our case we just flip the sign. */
 393
 394 #undef INTERNAL_SYSCALL_DECL
 395 #define INTERNAL_SYSCALL_DECL(err)
 396
 397 #undef INTERNAL_SYSCALL_ERROR_P
 398 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
 399         ((val < 0) && (val > -4095))
 400
 401 #undef INTERNAL_SYSCALL_ERRNO
 402 #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
 403
 404 /* Similar to INLINE_SYSCALL but we don't set errno */
 405 #undef INTERNAL_SYSCALL
 406 #define INTERNAL_SYSCALL(name, err, nr, args...)                        \
 407 ({                                                                      \
 408         long __sys_res;                                                 \
 409         {                                                               \
 410                 register unsigned long __res asm("r28");                \
 411                 PIC_REG_DEF                                             \
 412                 LOAD_ARGS_##nr(args)                                    \
 413                 /* FIXME: HACK save/load r19 around syscall */          \
 414                 asm volatile(                                           \
 415                         SAVE_ASM_PIC                                    \
 416                         "       ble  0x100(%%sr2, %%r0)\n"              \
 417                         "       ldi %1, %%r20\n"                        \
 418                         LOAD_ASM_PIC                                    \
 419                         : "=r" (__res)                                  \
 420                         : "i" (SYS_ify(name)) PIC_REG_USE ASM_ARGS_##nr \
 421                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 422                 );                                                      \
 423                 __sys_res = (long)__res;                                \
 424         }                                                               \
 425         __sys_res;                                                      \
 426  })
 427
 428
 429 /* The _NCS variant allows non-constant syscall numbers.  */
 430 #undef INTERNAL_SYSCALL_NCS
 431 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                    \
 432 ({                                                                      \
 433         long __sys_res;                                                 \
 434         {                                                               \
 435                 register unsigned long __res asm("r28");                \
 436                 PIC_REG_DEF                                             \
 437                 LOAD_ARGS_##nr(args)                                    \
 438                 /* FIXME: HACK save/load r19 around syscall */          \
 439                 asm volatile(                                           \
 440                         SAVE_ASM_PIC                                    \
 441                         "       ble  0x100(%%sr2, %%r0)\n"              \
 442                         "       copy %1, %%r20\n"                       \
 443                         LOAD_ASM_PIC                                    \
 444                         : "=r" (__res)                                  \
 445                         : "r" (name) PIC_REG_USE ASM_ARGS_##nr          \
 446                         : "memory", CALL_CLOB_REGS CLOB_ARGS_##nr       \
 447                 );                                                      \
 448                 __sys_res = (long)__res;                                \
 449         }                                                               \
 450         __sys_res;                                                      \
 451  })
 452
 453
 454
 455 #define LOAD_ARGS_0()
 456 #define LOAD_ARGS_1(r26)                                                \
 457   register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);   \
 458   LOAD_ARGS_0()
 459 #define LOAD_ARGS_2(r26,r25)                                            \
 460   register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);   \
 461   LOAD_ARGS_1(r26)
 462 #define LOAD_ARGS_3(r26,r25,r24)                                        \
 463   register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);   \
 464   LOAD_ARGS_2(r26,r25)
 465 #define LOAD_ARGS_4(r26,r25,r24,r23)                                    \
 466   register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);   \
 467   LOAD_ARGS_3(r26,r25,r24)
 468 #define LOAD_ARGS_5(r26,r25,r24,r23,r22)                                \
 469   register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);   \
 470   LOAD_ARGS_4(r26,r25,r24,r23)
 471 #define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)                            \
 472   register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);   \
 473   LOAD_ARGS_5(r26,r25,r24,r23,r22)
 474
 475 /* Even with zero args we use r20 for the syscall number */
 476 #define ASM_ARGS_0
 477 #define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
 478 #define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
 479 #define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
 480 #define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
 481 #define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
 482 #define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
 483
 484 /* The registers not listed as inputs but clobbered */
 485 #define CLOB_ARGS_6
 486 #define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
 487 #define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
 488 #define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
 489 #define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
 490 #define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
 491 #define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
 492
 493 #endif  /* __ASSEMBLER__ */
 494
 495 /* Pointer mangling is not yet supported for HPPA.  */
 496 #define PTR_MANGLE(var) (void) (var)
 497 #define PTR_DEMANGLE(var) (void) (var)
 498