diff options
Diffstat (limited to 'sysdeps/ia64/start.S')
| -rw-r--r-- | sysdeps/ia64/start.S | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/sysdeps/ia64/start.S b/sysdeps/ia64/start.S new file mode 100644 index 0000000000..7f80ba18ff --- /dev/null +++ b/sysdeps/ia64/start.S @@ -0,0 +1,119 @@ +/* Copyright (C) 1999-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Written by Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999. + + 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. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + 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 + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +#include <asm/unistd.h> +#include <asm/fpu.h> + +/* + * Arguments for __libc_start_main: + * out0: main + * out1: argc + * out2: argv + * out3: init + * out4: fini + * out5: rtld_fini + * out6: stack_end + */ + + .align 32 + .global _start + + .proc _start + .type _start,@function +_start: + .prologue + .save rp, r0 + .body + .prologue + { .mlx + alloc r2 = ar.pfs,0,0,7,0 + movl r3 = FPSR_DEFAULT + } + { .mlx + adds out2 = 16, sp /* get address of argc value */ + movl gp = @gprel(0f) + ;; + } +0: { .mmi + ld8 out1 = [out2], 8 /* load argc and move out2 to become argv */ + mov.m r10 = ar.bsp /* fetch rbs base address */ + mov r9 = ip + ;; + } + { .mii + mov ar.fpsr = r3 + sub gp = r9, gp /* back-compute gp value */ + adds out6 = 16, sp /* highest non-environment stack address */ + ;; + } + { + addl r11 = @ltoff(__libc_ia64_register_backing_store_base), gp + addl out0 = @ltoff(@fptr(main)), gp + addl out3 = @ltoff(@fptr(__libc_csu_init)), gp + ;; + } + { .mmi + ld8 r3 = [r11] /* pointer to __libc_ia64_register_backing_store_base */ + ld8 out0 = [out0] /* pointer to `main' function descriptor */ + addl out4 = @ltoff(@fptr(__libc_csu_fini)), gp + ;; + } + { .mmi + ld8 out3 = [out3] /* pointer to `init' function descriptor */ + ld8 out4 = [out4] /* pointer to `fini' function descriptor */ + nop 0 + } + .body + { .mib + st8 [r3] = r10 + mov out5 = ret0 /* dynamic linker destructor */ + br.call.sptk.few rp = __libc_start_main + } + { .mib + break 0 /* break miserably if we ever return */ + } + .endp _start + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .long 0 + .weak data_start + data_start = __data_start + + .common __libc_ia64_register_backing_store_base, 8, 8 |