mirror of
git://sourceware.org/git/glibc.git
synced 2025-03-06 20:58:33 +01:00
5e8cfc5d62
The sparc clone mitigation (faeaa3bc9f) added the use of
flushw, which is not support by LEON/sparcv8. As discussed on
the libc-alpha, 'ta 3' is a working alternative [1].
[1] https://sourceware.org/pipermail/libc-alpha/2024-August/158905.html
Checked with a build for sparcv8-linux-gnu targetting leon.
Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
94 lines
2.2 KiB
ArmAsm
94 lines
2.2 KiB
ArmAsm
/* Copyright (C) 1996-2024 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* clone() is even more special than fork() as it mucks with stacks
|
|
and invokes a function in the right context after its all over. */
|
|
|
|
#include <asm/errno.h>
|
|
#include <tcb-offsets.h>
|
|
#include <sysdep.h>
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
|
|
pid_t *ptid, void *tls, pid_t *ctid); */
|
|
|
|
.text
|
|
ENTRY (__clone)
|
|
save %sp,-96,%sp
|
|
save %sp,-96,%sp
|
|
#ifdef __sparcv9
|
|
flushw
|
|
#else
|
|
ta 3
|
|
#endif
|
|
restore
|
|
cfi_def_cfa_register(%fp)
|
|
cfi_window_save
|
|
cfi_register(%o7, %i7)
|
|
|
|
/* sanity check arguments */
|
|
orcc %i0,%g0,%g2
|
|
be .Leinval
|
|
orcc %i1,%g0,%o1
|
|
be .Leinval
|
|
mov %i2,%o0
|
|
|
|
/* The child_stack is the top of the stack, allocate one
|
|
whole stack frame from that as this is what the kernel
|
|
expects. */
|
|
sub %o1, 96, %o1
|
|
mov %i3, %g3
|
|
|
|
/* ptid */
|
|
mov %i4,%o2
|
|
/* tls */
|
|
mov %i5,%o3
|
|
/* ctid */
|
|
ld [%fp+92],%o4
|
|
|
|
/* Do the system call */
|
|
set __NR_clone,%g1
|
|
ta 0x10
|
|
bcs .Lerror
|
|
tst %o1
|
|
bne __thread_start
|
|
nop
|
|
jmpl %i7 + 8, %g0
|
|
restore %o0,%g0,%o0
|
|
|
|
.Leinval:
|
|
mov EINVAL, %o0
|
|
.Lerror:
|
|
call HIDDEN_JUMPTARGET(__errno_location)
|
|
mov %o0, %i0
|
|
st %i0,[%o0]
|
|
jmpl %i7 + 8, %g0
|
|
restore %g0,-1,%o0
|
|
END(__clone)
|
|
|
|
.type __thread_start,@function
|
|
__thread_start:
|
|
mov %g0, %fp /* terminate backtrace */
|
|
call %g2
|
|
mov %g3,%o0
|
|
set __NR_exit, %g1
|
|
ta 0x10
|
|
nop
|
|
|
|
.size __thread_start, .-__thread_start
|
|
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|