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([2804:431:c7ca:103f:1000:c46d:a2d6:9bed]) by smtp.gmail.com with ESMTPSA id p1sm596703qke.109.2021.12.14.12.53.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Dec 2021 12:53:23 -0800 (PST) Message-ID: Date: Tue, 14 Dec 2021 17:53:20 -0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0 Subject: Re: [PATCH v3 03/13] or1k: ABI Implementation Content-Language: en-US To: Stafford Horne , GLIBC patches Cc: Openrisc References: <20211210233456.4146479-1-shorne@gmail.com> <20211210233456.4146479-4-shorne@gmail.com> From: Adhemerval Zanella In-Reply-To: <20211210233456.4146479-4-shorne@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, KAM_STOCKGEN, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Dec 2021 20:53:27 -0000 On 10/12/2021 20:34, Stafford Horne via Libc-alpha wrote: > This code deals with the OpenRISC ABI. Some comments below. > --- > sysdeps/or1k/__longjmp.S | 55 ++++++++++++++++++++++ > sysdeps/or1k/bits/endianness.h | 11 +++++ > sysdeps/or1k/bits/setjmp.h | 32 +++++++++++++ > sysdeps/or1k/bsd-_setjmp.S | 1 + > sysdeps/or1k/bsd-setjmp.S | 1 + > sysdeps/or1k/dl-trampoline.S | 79 ++++++++++++++++++++++++++++++++ > sysdeps/or1k/jmpbuf-offsets.h | 23 ++++++++++ > sysdeps/or1k/jmpbuf-unwind.h | 36 +++++++++++++++ > sysdeps/or1k/machine-gmon.h | 35 ++++++++++++++ > sysdeps/or1k/memusage.h | 21 +++++++++ > sysdeps/or1k/setjmp.S | 56 +++++++++++++++++++++++ > sysdeps/or1k/sysdep.h | 83 ++++++++++++++++++++++++++++++++++ > 12 files changed, 433 insertions(+) > create mode 100644 sysdeps/or1k/__longjmp.S > create mode 100644 sysdeps/or1k/bits/endianness.h > create mode 100644 sysdeps/or1k/bits/setjmp.h > create mode 100644 sysdeps/or1k/bsd-_setjmp.S > create mode 100644 sysdeps/or1k/bsd-setjmp.S > create mode 100644 sysdeps/or1k/dl-trampoline.S > create mode 100644 sysdeps/or1k/jmpbuf-offsets.h > create mode 100644 sysdeps/or1k/jmpbuf-unwind.h > create mode 100644 sysdeps/or1k/machine-gmon.h > create mode 100644 sysdeps/or1k/memusage.h > create mode 100644 sysdeps/or1k/setjmp.S > create mode 100644 sysdeps/or1k/sysdep.h > > diff --git a/sysdeps/or1k/__longjmp.S b/sysdeps/or1k/__longjmp.S > new file mode 100644 > index 0000000000..f8aa5dda8f > --- /dev/null > +++ b/sysdeps/or1k/__longjmp.S > @@ -0,0 +1,55 @@ > +/* longjmp, OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, write to the Free > + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + 02111-1307 USA. */ > + > +#include > +#define _ASM > +#define _SETJMP_H > +#include > + > + .globl __longjmp; > + .type __longjmp, @function; > + .align 4; > + > +__longjmp: Use ENTRY/END here, as other setjmp functions are doing. > + l.lwz r1, 0(r3) > + l.lwz r2, 4(r3) > + > + /* if r4 is 0, something wrong, so set it to 1 */ > + l.sfeqi r4, 0x0 > + l.bnf 1f /* r4 != 0, longjmp value sensible */ > + l.nop > + l.ori r4, r0, 0x1 /* make nonzero */ > +1: > + l.addi r11, r4, 0 > + l.lwz r9, 8(r3) > + l.lwz r10, 12(r3) > + l.lwz r14, 16(r3) > + l.lwz r16, 20(r3) > + l.lwz r18, 24(r3) > + l.lwz r20, 28(r3) > + l.lwz r22, 32(r3) > + l.lwz r24, 36(r3) > + l.lwz r26, 40(r3) > + l.lwz r28, 44(r3) > + l.lwz r30, 48(r3) > + l.jr r9 > + l.nop > + .size __longjmp, . - __longjmp > + > +libc_hidden_def(__longjmp) > diff --git a/sysdeps/or1k/bits/endianness.h b/sysdeps/or1k/bits/endianness.h > new file mode 100644 > index 0000000000..7b61d8adb7 > --- /dev/null > +++ b/sysdeps/or1k/bits/endianness.h > @@ -0,0 +1,11 @@ > +#ifndef _BITS_ENDIANNESS_H > +#define _BITS_ENDIANNESS_H 1 > + > +#ifndef _BITS_ENDIAN_H > +# error "Never use directly; include instead." > +#endif > + > +/* OpenRISC is big-endian. */ > +#define __BYTE_ORDER __BIG_ENDIAN > + > +#endif /* bits/endianness.h */ Ok. > diff --git a/sysdeps/or1k/bits/setjmp.h b/sysdeps/or1k/bits/setjmp.h > new file mode 100644 > index 0000000000..dac511c904 > --- /dev/null > +++ b/sysdeps/or1k/bits/setjmp.h > @@ -0,0 +1,32 @@ > +/* Define the machine-dependent type `jmp_buf'. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, write to the Free > + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + 02111-1307 USA. */ > + > + > +#ifndef _OR1K_BITS_SETJMP_H > +#define _OR1K_BITS_SETJMP_H 1 > + > +#if !defined _SETJMP_H && !defined _PTHREAD_H > +# error "Never include directly; use instead." > +#endif > + > +#ifndef _ASM > +typedef long int __jmp_buf[13]; > +#endif > + > +#endif /* _OR1K_BITS_SETJMP_H */ Ok. > diff --git a/sysdeps/or1k/bsd-_setjmp.S b/sysdeps/or1k/bsd-_setjmp.S > new file mode 100644 > index 0000000000..4e6a2da560 > --- /dev/null > +++ b/sysdeps/or1k/bsd-_setjmp.S > @@ -0,0 +1 @@ > +/* _setjmp is in setjmp.S */ > diff --git a/sysdeps/or1k/bsd-setjmp.S b/sysdeps/or1k/bsd-setjmp.S > new file mode 100644 > index 0000000000..1da848d2f1 > --- /dev/null > +++ b/sysdeps/or1k/bsd-setjmp.S > @@ -0,0 +1 @@ > +/* setjmp is in setjmp.S */ > diff --git a/sysdeps/or1k/dl-trampoline.S b/sysdeps/or1k/dl-trampoline.S > new file mode 100644 > index 0000000000..9ebc68f525 > --- /dev/null > +++ b/sysdeps/or1k/dl-trampoline.S > @@ -0,0 +1,79 @@ > +/* Machine-dependent ELF runtime symbol resolution, OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, write to the Free > + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + 02111-1307 USA. */ > + > +/* This code is used to call _dl_linux_resolver (dl-runtime.c). > + > + We assume that R11 contains the relocation offset and R12 contains > + link_map (_DYNAMIC). This must be consistent with the JUMP_SLOT > + layout generated by binutils. */ > + > + .section .text > + .align 4 > + > + .global _dl_runtime_resolve > + .type _dl_runtime_resolve, @function > + > +_dl_runtime_resolve: > + .cfi_startproc > + l.sw -4(r1), r9 > + l.sw -8(r1), r1 > + > + /* save function arguments. */ > + l.sw -12(r1), r3 > + l.sw -16(r1), r4 > + l.sw -20(r1), r5 > + l.sw -24(r1), r6 > + l.sw -28(r1), r7 > + l.sw -32(r1), r8 > + > + .cfi_offset 9, -4 > + .cfi_offset 1, -8 > + .cfi_offset 3, -12 > + .cfi_offset 4, -16 > + .cfi_offset 5, -20 > + .cfi_offset 6, -24 > + .cfi_offset 7, -28 > + .cfi_offset 8, -32 > + > + l.addi r1,r1, -32 > + .cfi_def_cfa_offset 32 > + > + l.ori r3, r12, 0 > + l.ori r4, r11, 0 > + > + l.jal _dl_fixup > + l.nop > + > + /* Restore function arguments. */ > + l.addi r1,r1, 32 > + l.lwz r8, -32(r1) > + l.lwz r7, -28(r1) > + l.lwz r6, -24(r1) > + l.lwz r5, -20(r1) > + l.lwz r4, -16(r1) > + l.lwz r3, -12(r1) > + > + /* restore return address. */ > + l.lwz r9, -4(r1) > + > + l.jr r11 > + l.nop > + > + .cfi_endproc > + .size _dl_runtime_resolve, . - _dl_runtime_resolve It seems that _dl_runtime_profile is not implemented and explicit disabled on sysdeps/or1k/dl-machine.h. In this case I think it would be better to explicit disable it on configure: diff --git a/configure.ac b/configure.ac index 277d3527d2..6883069b36 100644 --- a/configure.ac +++ b/configure.ac @@ -525,6 +525,9 @@ libc_config_ok=no # whether to use such directories. with_fp_cond=1 +# A preconfigure script may disable profile support +with_profile=yes + dnl Let sysdeps/*/preconfigure act here. LIBC_PRECONFIGURE([$srcdir], [for sysdeps]) @@ -1891,6 +1894,12 @@ LIBC_CONFIG_VAR([enable-static-pie], [$libc_cv_static_pie]) libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory` AC_SUBST(libc_cv_multidir) +if test "x$profile" != xno; then + if test "x$with_profile" == xno; then + AC_MSG_ERROR([ABI does not support profiling]) + fi +fi + AC_SUBST(profile) AC_SUBST(static_nss) diff --git a/sysdeps/or1k/preconfigure b/sysdeps/or1k/preconfigure index d1b1fb1843..b8d4f8c716 100644 --- a/sysdeps/or1k/preconfigure +++ b/sysdeps/or1k/preconfigure @@ -32,3 +32,4 @@ or1k*) ;; esac +with_profile=no > diff --git a/sysdeps/or1k/jmpbuf-offsets.h b/sysdeps/or1k/jmpbuf-offsets.h > new file mode 100644 > index 0000000000..e33105cc03 > --- /dev/null > +++ b/sysdeps/or1k/jmpbuf-offsets.h > @@ -0,0 +1,23 @@ > +/* Private macros for accessing __jmp_buf contents. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library. If not, see > + . */ > + > +#define __JMP_BUF_SP 0 > + > +/* Helper for generic function ____longjmp_chk. */ > +#define JB_FRAME_ADDRESS(buf) \ > + ((void *) (unsigned long) (buf[__JMP_BUF_SP])) > diff --git a/sysdeps/or1k/jmpbuf-unwind.h b/sysdeps/or1k/jmpbuf-unwind.h > new file mode 100644 > index 0000000000..6710dea989 > --- /dev/null > +++ b/sysdeps/or1k/jmpbuf-unwind.h > @@ -0,0 +1,36 @@ > +/* Macros to help frame unwinding using jmpbuf. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library. If not, see > + . */ > + > +#include > +#include > +#include > +#include > + > +/* Test if longjmp to JMPBUF would unwind the frame > + containing a local variable at ADDRESS. */ > +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \ > + ((void *) (address) < (void *) demangle (jmpbuf[__JMP_BUF_SP])) > + > +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \ > + _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj) > + > +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \ > + ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf)[__JMP_BUF_SP] - (_adj)) > + > +/* We use the normal longjmp for unwinding. */ > +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val) > diff --git a/sysdeps/or1k/machine-gmon.h b/sysdeps/or1k/machine-gmon.h > new file mode 100644 > index 0000000000..7152105eec > --- /dev/null > +++ b/sysdeps/or1k/machine-gmon.h > @@ -0,0 +1,35 @@ > +/* Machine-dependent definitions for profiling support. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library. If not, see > + . */ > + > +#include > + > +#define _MCOUNT_DECL(frompc, selfpc) \ > +static void \ > +__mcount_internal (unsigned long int frompc, unsigned long int selfpc) > + > +/* This is very simple as gcc does all the heavy lifting at the _mcount > + call site. GCC passes in the return address of the function calling > + _mcount. */ > + > +#define MCOUNT \ > +void \ > +_mcount (void *frompc) \ > +{ \ > + __mcount_internal ((unsigned long int) frompc, \ > + (unsigned long int) __builtin_return_address (0)); \ > +} > diff --git a/sysdeps/or1k/memusage.h b/sysdeps/or1k/memusage.h > new file mode 100644 > index 0000000000..a62da17e61 > --- /dev/null > +++ b/sysdeps/or1k/memusage.h > @@ -0,0 +1,21 @@ > +/* Definitions for memory usage profiling. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, see > + . */ > + > +#define GETSP() ({ register uintptr_t stack_ptr asm ("r1"); stack_ptr; }) > + > +#include > diff --git a/sysdeps/or1k/setjmp.S b/sysdeps/or1k/setjmp.S > new file mode 100644 > index 0000000000..660995b493 > --- /dev/null > +++ b/sysdeps/or1k/setjmp.S > @@ -0,0 +1,56 @@ > +/* setjmp, OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library; if not, write to the Free > + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA > + 02111-1307 USA. */ > + > +#include > +#define _ASM > +#define _SETJMP_H > +#include > + > +ENTRY (_setjmp) > + l.addi r4, r0, 0 /* Set second argument to 0. */ > + l.j .Local__sigsetjmp > + l.nop > +END (_setjmp) > +libc_hidden_def (_setjmp) > + > +ENTRY (setjmp) > + l.addi r4, r0, 1 /* Set second argument to 1. */ > + l.j .Local__sigsetjmp > + l.nop > +END (setjmp) > + > +ENTRY (__sigsetjmp) > +.Local__sigsetjmp: > + l.sw 0(r3), r1 > + l.sw 4(r3), r2 > + l.sw 8(r3), r9 > + l.sw 12(r3), r10 > + l.sw 16(r3), r14 > + l.sw 20(r3), r16 > + l.sw 24(r3), r18 > + l.sw 28(r3), r20 > + l.sw 32(r3), r22 > + l.sw 36(r3), r24 > + l.sw 40(r3), r26 > + l.sw 44(r3), r28 > + l.sw 48(r3), r30 > + l.j __sigjmp_save > + l.nop > +END (__sigsetjmp) > +hidden_def (__sigsetjmp) > diff --git a/sysdeps/or1k/sysdep.h b/sysdeps/or1k/sysdep.h > new file mode 100644 > index 0000000000..61a135afe7 > --- /dev/null > +++ b/sysdeps/or1k/sysdep.h > @@ -0,0 +1,83 @@ > +/* Assembler macro definitions. OpenRISC version. > + Copyright (C) 2021 Free Software Foundation, Inc. > + This file is part of the GNU C Library. > + > + The GNU C Library is free software; you can redistribute it and/or > + modify it under the terms of the GNU Lesser General Public > + License as published by the Free Software Foundation; either > + version 2.1 of the License, or (at your option) any later version. > + > + The GNU C Library is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + Lesser General Public License for more details. > + > + You should have received a copy of the GNU Lesser General Public > + License along with the GNU C Library. If not, see > + . */ > + > +#include > +#include > + > +#if defined __ASSEMBLER__ || defined REQUEST_ASSEMBLER_MACROS > + > +/* Make use of .size directive. */ > +#define ASM_SIZE_DIRECTIVE(name) .size name,.-name; > + > +/* Define an entry point visible from C. */ > +#define ENTRY(name) \ > + .globl C_SYMBOL_NAME(name); \ > + .type C_SYMBOL_NAME(name),@function; \ > + .align 4; \ > + C_LABEL(name) \ > + cfi_startproc; \ > + CALL_MCOUNT > + > +#undef END > +#define END(name) \ > + cfi_endproc; \ > + ASM_SIZE_DIRECTIVE(name) > + > +/* Since C identifiers are not normally prefixed with an underscore > + on this system, the asm identifier `syscall_error' intrudes on the > + C name space. Make sure we use an innocuous name. */ > +#define syscall_error __syscall_error > + > +/* If compiled for profiling, call `mcount' at the start of each function. */ > +#ifdef PROF > +# ifdef __PIC__ > +# define CALL_MCOUNT \ > + l.addi r1, r1, -8; \ > + l.sw 0(r1), r9; \ > + l.sw 4(r1), r3; \ > + l.ori r3, r9, 0; \ > + l.j plt(_mcount); \ > + l.nop; \ > + l.lwz r9, 0(r1); \ > + l.lwz r3, 4(r1); \ > + l.addi r1, r1, 8; > +# else > +# define CALL_MCOUNT \ > + l.addi r1, r1, -8; \ > + l.sw 0(r1), r9; \ > + l.sw 4(r1), r3; \ > + l.ori r3, r9, 0; \ > + l.movhi r15, hi(_mcount); \ > + l.ori r15, r15, lo(_mcount); \ > + l.jr r15; \ > + l.nop; \ > + l.lwz r9, 0(r1); \ > + l.lwz r3, 4(r1); \ > + l.addi r1, r1, 8; > +# endif > +#else > +# define CALL_MCOUNT /* Do nothing. */ > +#endif > + > +/* Local label name for asm code. */ > +#define L(name) .L##name > + > +/* Specify the size in bytes of a machine register. */ > +#define REGSIZE 4 > + > +#endif /* __ASSEMBLER__ */