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035c012e32
It turns out the startup code in csu/elf-init.c has a perfect pair of ROP gadgets (see Marco-Gisbert and Ripoll-Ripoll, "return-to-csu: A New Method to Bypass 64-bit Linux ASLR"). These functions are not needed in dynamically-linked binaries because DT_INIT/DT_INIT_ARRAY are already processed by the dynamic linker. However, the dynamic linker skipped the main program for some reason. For maximum backwards compatibility, this is not changed, and instead, the main map is consulted from __libc_start_main if the init function argument is a NULL pointer. For statically linked binaries, the old approach based on linker symbols is still used because there is nothing else available. A new symbol version __libc_start_main@@GLIBC_2.34 is introduced because new binaries running on an old libc would not run their ELF constructors, leading to difficult-to-debug issues.
104 lines
3.1 KiB
ArmAsm
104 lines
3.1 KiB
ArmAsm
/* Startup code compliant to the ELF C-SKY ABIV2.
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Copyright (C) 2018-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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/* We need to call:
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__libc_start_main (int (*main) (int, char **, char **), int argc,
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char **argv, void (*init) (void), void (*fini) (void),
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void (*rtld_fini) (void), void *stack_end)
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*/
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#include <sysdep.h>
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.text
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.globl _start;
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.type _start,@function;
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.align 4;
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_start:
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cfi_startproc
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.cfi_label .Ldummy
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cfi_undefined (lr)
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subi sp, 8
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/* Clear the link register since this is the outermost frame. */
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movi lr, 0
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/* Pop argc off the stack and save a pointer to argv. */
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ldw a1, (sp, 8) /* Init argc for __libc_start_main. */
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addi a2, sp, 12 /* Init argv for __libc_start_main. */
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/* Push stack limit. */
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stw a2, (sp, 8)
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/* Push rtld_fini. */
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stw a0, (sp, 4)
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#ifdef SHARED
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grs t0, .Lgetpc
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.Lgetpc:
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lrw gb, .Lgetpc@GOTPC
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addu gb, t0
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movi a3, 0 /* Used to be init. */
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stw a3, (sp, 0) /* Used to be fini. */
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lrw t0, main@GOT
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addu t0, gb
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ldw a0, (t0, 0)
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lrw t1, __libc_start_main@PLT
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ldr.w t1, (gb, t1 << 0)
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jsr t1
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lrw t1, abort@PLT
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ldr.w t1, (gb, t1 << 0)
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jsr t1
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#else
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movi a3, 0 /* Used to be init. */
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stw a3, (sp, 0) /* Used to be fini. */
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lrw a0, main
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/* Let the libc call main and exit with its return code. */
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jsri __libc_start_main
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/* Should never get here. */
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jsri abort
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#endif /* !SHARED */
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cfi_endproc
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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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.globl __data_start
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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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