mirror of
https://sourceware.org/git/glibc.git
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4372980f58
I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure. Beyond the README
update, the move was just
git mv ports/sysdeps/tile sysdeps/tile
git mv ports/sysdeps/unix/sysv/linux/tile \
sysdeps/unix/sysv/linux/tile
git mv ports/sysdeps/unix/sysv/linux/generic \
sysdeps/unix/sysv/linux/generic
I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d7
and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.
204 lines
5.8 KiB
ArmAsm
204 lines
5.8 KiB
ArmAsm
/* Copyright (C) 2011-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This is the canonical entry point, usually the first thing in the text
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segment. The ELF standard tells us that the stack is set up like this on
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entry (the left side is the offset from "sp"), in units of
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__SIZEOF_POINTER__ entries:
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+0 argc
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+1 argv[0]
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...
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+(argc+1) NULL
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+(argc+2) envp[0]
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...
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NULL
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... ElfInfo
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The ElfInfo is pairs of key/value long words following the envp
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pointers and terminated by a zero-valued key.
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Although not mandated by the standard, it happens to be the case
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that we store the actual argv and envp strings immediately after
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the ElfInfo data on the stack.
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On entry r0 points to the shared library termination function, or 0
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if there isn't one.
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*/
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#include <features.h>
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#include <sysdep.h>
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#include <arch/abi.h>
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/* Just create no-ops if we don't support PC-relative PLT relocations. */
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#ifdef NO_PLT_PCREL
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# define hw2_last_plt(x) 0
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# define hw1_plt(x) 0
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# define hw0_plt(x) 0
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#endif
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.text
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.global _start
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.type _start,@function
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.align 8
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_start:
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/* Linux starts us with sp pointing at the conventional Elf layout,
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but we need to allow two "caller" words for our ABI convention. */
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{
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/* Load argc (stored as a "long", equivalent to a pointer type). */
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LD_PTR r1, sp
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/* Save incoming 'sp', which points to the Elf argument block. */
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move r52, sp
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}
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{
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/* Allocate stack frame callee space for __libc_start_main. */
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ADDI_PTR r12, sp, -(2 * REGSIZE)
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}
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{
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/* Get our PC. */
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lnk r13
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/* sp is not necessarily properly aligned on startup because
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of the way ld.so pops off leading argv elements. So align it. */
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andi sp, r12, -8
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}
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.Lmy_pc:
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{
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/* Pass the address of the shared library termination function. */
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move r5, r0
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/* Compute location where __libc_start_main's caller is supposed to
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store its frame pointer. */
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ADDI_PTR r12, sp, REGSIZE
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/* Zero out callee space for return address. Unnecessary but free.
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This is just paranoia to help backtracing not go awry. */
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ST sp, zero
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}
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{
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/* Zero out our frame pointer for __libc_start_main. */
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ST r12, zero
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/* Zero out lr to make __libc_start_main the end of backtrace. */
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move lr, zero
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/* Compute a pointer to argv. envp will be determined
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later in __libc_start_main. We set up the first argument
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(the address of main) below. */
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ADDI_PTR r2, r52, __SIZEOF_POINTER__
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}
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{
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/* Pass the highest stack address to user code. */
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ADDI_PTR r6, sp, (2 * REGSIZE)
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/* Pass address of main() in r0, and of our own entry
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points to .fini and .init in r3 and r4. */
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#ifdef __tilegx__
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moveli r0, hw2_last(main - .Lmy_pc)
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}
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{
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shl16insli r0, r0, hw1(main - .Lmy_pc)
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moveli r3, hw2_last(__libc_csu_init - .Lmy_pc)
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}
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{
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shl16insli r0, r0, hw0(main - .Lmy_pc)
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shl16insli r3, r3, hw1(__libc_csu_init - .Lmy_pc)
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}
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{
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ADD_PTR r0, r0, r13
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shl16insli r3, r3, hw0(__libc_csu_init - .Lmy_pc)
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}
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{
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moveli r12, hw2_last_plt(__libc_start_main - .Lmy_pc)
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ADD_PTR r3, r3, r13
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}
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{
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shl16insli r12, r12, hw1_plt(__libc_start_main - .Lmy_pc)
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moveli r4, hw2_last(__libc_csu_fini - .Lmy_pc)
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}
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{
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shl16insli r12, r12, hw0_plt(__libc_start_main - .Lmy_pc)
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shl16insli r4, r4, hw1(__libc_csu_fini - .Lmy_pc)
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}
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{
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ADD_PTR r12, r12, r13
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shl16insli r4, r4, hw0(__libc_csu_fini - .Lmy_pc)
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}
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{
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ADD_PTR r4, r4, r13
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# ifdef NO_PLT_PCREL
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j plt(__libc_start_main)
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# else
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jr r12
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# endif
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}
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#else
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addli r0, r13, lo16(main - .Lmy_pc)
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}
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{
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auli r0, r0, ha16(main - .Lmy_pc)
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addli r3, r13, lo16(__libc_csu_init - .Lmy_pc)
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}
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{
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auli r3, r3, ha16(__libc_csu_init - .Lmy_pc)
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addli r4, r13, lo16(__libc_csu_fini - .Lmy_pc)
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}
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{
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auli r4, r4, ha16(__libc_csu_fini - .Lmy_pc)
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/* Call the user's main function, and exit with its value.
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But let the libc call main. */
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j plt(__libc_start_main)
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}
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#endif
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{
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/* Tell backtracer to give up (_start has no caller). */
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info INFO_OP_CANNOT_BACKTRACE
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}
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.size _start, .-_start
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/* Define a symbol for the first piece of initialized data. */
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.data
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.global __data_start
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.align 8
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__data_start:
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.long 0
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.weak data_start
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data_start = __data_start
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