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faeaa3bc9f
It seems the kernel can not deal with uncommitted stack space in the area intended for the register window when executing the clone() system call. So create a nested frame (proxy for the kernel frame) and flush it from the processor to memory to force committing pages to the stack before invoking the system call. Bug: https://www.mail-archive.com/debian-glibc@lists.debian.org/msg62592.html Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31394 See-also: https://lore.kernel.org/sparclinux/62f9be9d-a086-4134-9a9f-5df8822708af@mkarcher.dialup.fu-berlin.de/ Signed-off-by: Michael Karcher <sourceware-bugzilla@mkarcher.dialup.fu-berlin.de> Reviewed-by: DJ Delorie <dj@redhat.com>
90 lines
2.1 KiB
ArmAsm
90 lines
2.1 KiB
ArmAsm
/* Copyright (C) 1996-2024 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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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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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <asm/errno.h>
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#include <tcb-offsets.h>
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#include <sysdep.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *ptid, void *tls, pid_t *ctid); */
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.text
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ENTRY (__clone)
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save %sp,-96,%sp
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save %sp,-96,%sp
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flushw
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restore
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cfi_def_cfa_register(%fp)
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cfi_window_save
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cfi_register(%o7, %i7)
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/* sanity check arguments */
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orcc %i0,%g0,%g2
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be .Leinval
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orcc %i1,%g0,%o1
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be .Leinval
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mov %i2,%o0
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/* The child_stack is the top of the stack, allocate one
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whole stack frame from that as this is what the kernel
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expects. */
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sub %o1, 96, %o1
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mov %i3, %g3
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/* ptid */
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mov %i4,%o2
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/* tls */
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mov %i5,%o3
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/* ctid */
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ld [%fp+92],%o4
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/* Do the system call */
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set __NR_clone,%g1
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ta 0x10
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bcs .Lerror
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tst %o1
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bne __thread_start
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nop
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jmpl %i7 + 8, %g0
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restore %o0,%g0,%o0
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.Leinval:
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mov EINVAL, %o0
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.Lerror:
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call HIDDEN_JUMPTARGET(__errno_location)
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mov %o0, %i0
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st %i0,[%o0]
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jmpl %i7 + 8, %g0
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restore %g0,-1,%o0
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END(__clone)
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.type __thread_start,@function
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__thread_start:
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mov %g0, %fp /* terminate backtrace */
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call %g2
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mov %g3,%o0
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set __NR_exit, %g1
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ta 0x10
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nop
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.size __thread_start, .-__thread_start
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libc_hidden_def (__clone)
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weak_alias (__clone, clone)
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