2010-09-30 20:21:57 +02:00
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/* crti.s for __init, __fini
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This file supplies the prologue for __init and __fini routines
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2022-01-03 10:42:10 +01:00
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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2010-09-30 20:21:57 +02:00
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Contributed by Michael Eager <eager@eagercon.com>.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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Enable no-exec stacks for more targets using the Linux kernel.
Building glibc for many different configurations and running the
compilation parts of the testsuite runs into failures of the
elf/check-execstack test for hppa and microblaze. Those
configurations default to executable stacks in the Linux kernel
because of VM_DATA_DEFAULT_FLAGS definitions including VM_EXEC
(VM_DATA_DEFAULT_FLAGS being the default definition of
VM_STACK_DEFAULT_FLAGS).
This fails because those configurations are not generating
.note.GNU-stack sections to indicate that programs do not need an
executable stack. This patch fixes GCC to generate those sections on
those architectures (when configured for a target using the Linux
kernel), as it does on other architectures, together with adding that
section to libgcc .S sources, with the same code as used on other
architectures (or a variant using "#ifdef __linux__" instead of the
usual "#if defined(__ELF__) && defined(__linux__)" for microblaze, as
that configuration doesn't use elfos.h and so doesn't define __ELF__).
This suffices to eliminate that glibc test failure. (For hppa, the
compilation parts of the glibc testsuite still fail because of the
separate elf/check-textrel failure.)
gcc:
* config/microblaze/linux.h (TARGET_ASM_FILE_END): Likewise.
* config/pa/pa.h (NEED_INDICATE_EXEC_STACK): Likewise.
* config/pa/pa-linux.h (NEED_INDICATE_EXEC_STACK): Likewise.
* config/pa/pa.c (pa_hpux_file_end): Rename to pa_file_end.
Define unconditionally, with [ASM_OUTPUT_EXTERNAL_REAL]
conditionals inside the function instead of around it. Call
file_end_indicate_exec_stack if NEED_INDICATE_EXEC_STACK.
(TARGET_ASM_FILE_END): Define unconditionally to pa_file_end.
libgcc:
* config/microblaze/crti.S, config/microblaze/crtn.S,
config/microblaze/divsi3.S, config/microblaze/moddi3.S,
config/microblaze/modsi3.S, config/microblaze/muldi3_hard.S,
config/microblaze/mulsi3.S,
config/microblaze/stack_overflow_exit.S,
config/microblaze/udivsi3.S, config/microblaze/umodsi3.S,
config/pa/milli64.S: Add .note.GNU-stack section.
From-SVN: r253204
2017-09-26 18:35:53 +02:00
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/* An executable stack is *not* required for these functions. */
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#ifdef __linux__
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.section .note.GNU-stack,"",%progbits
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.previous
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#endif
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2010-09-30 20:21:57 +02:00
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.section .init, "ax"
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.global __init
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2013-03-04 16:23:05 +01:00
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.weak _stack
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.set _stack, 0xffffffff
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.weak _stack_end
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.set _stack_end, 0
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2010-09-30 20:21:57 +02:00
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.align 2
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__init:
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addik r1, r1, -8
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sw r15, r0, r1
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2013-03-04 16:23:05 +01:00
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la r11, r0, _stack
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mts rshr, r11
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la r11, r0, _stack_end
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mts rslr, r11
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2010-09-30 20:21:57 +02:00
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.section .fini, "ax"
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.global __fini
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.align 2
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__fini:
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addik r1, r1, -8
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sw r15, r0, r1
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