mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 23:00:22 +00:00
c4e5f34bf0
Mark the lr register as undefined at the start of execution, so unwind will stop at this frame. run-backtrace-*.sh from elfutils testsuite will fail without this patch. * sysdeps/csky/abiv2/start.S: Mark lr as undefined. * sysdeps/unix/sysv/linux/csky/abiv2/clone.S: Likewise. * sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S: Likewise.
99 lines
2.5 KiB
ArmAsm
99 lines
2.5 KiB
ArmAsm
/* Wrapper around clone system call. C-SKY ABIV2 version.
|
|
Copyright (C) 2018-2019 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
|
|
<http://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 <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
|
|
/* int clone (int (*fn) (void *arg), void *child_stack, int flags, void *arg,
|
|
pid_t *ptid, struct user_desc *tls, pid_t *ctid) */
|
|
|
|
.text
|
|
ENTRY (__clone)
|
|
/* Sanity check arguments. */
|
|
cmpnei a0, 0 /* No NULL function pointers. */
|
|
bf __error_arg
|
|
cmpnei a1, 0 /* No NULL stack pointers. */
|
|
bf __error_arg
|
|
|
|
subi a1, 8
|
|
stw a0, (a1, 0) /* Insert the function into the new stack. */
|
|
stw a3, (a1, 4) /* Insert the args into the new stack. */
|
|
|
|
mov t1, r7 /* Save r7. */
|
|
mov t2, r4 /* Save r4. */
|
|
|
|
/* The syscall expects the args to be in different slots. */
|
|
mov a0, a2
|
|
ldw a2, (sp, 0)
|
|
ldw a3, (sp, 8)
|
|
ldw r4, (sp, 4)
|
|
lrw r7, __NR_clone
|
|
trap 0
|
|
|
|
mov r7, t1 /* Restore r7. */
|
|
mov r4, t2 /* Restore r4. */
|
|
btsti a0, 31 /* Check if return is less than zero. */
|
|
bt __do_syscall_error
|
|
cmpnei a0, 0
|
|
bf __thread_start
|
|
rts
|
|
|
|
__error_arg:
|
|
lrw a0, -EINVAL
|
|
|
|
__do_syscall_error:
|
|
#ifdef __PIC__
|
|
subi sp, 8
|
|
stw gb, (sp, 0)
|
|
stw r15, (sp, 4)
|
|
grs gb, .Lgetpc
|
|
.Lgetpc:
|
|
lrw t0, .Lgetpc@GOTPC
|
|
addu gb, gb, t0
|
|
lrw t0, __syscall_error@PLT
|
|
ldr.w t0, (gb, t0 << 0)
|
|
jsr t0
|
|
ldw gb, (sp, 0)
|
|
ldw r15, (sp, 4)
|
|
addi sp, 8
|
|
#else
|
|
jmpi __syscall_error
|
|
#endif /* __PIC__ */
|
|
rts
|
|
PSEUDO_END (__clone)
|
|
|
|
ENTRY (__thread_start)
|
|
.cfi_label .Ldummy
|
|
cfi_undefined (lr)
|
|
ldw a0, (sp, 4) /* Restore args from new sp. */
|
|
ldw a1, (sp, 0) /* Restore function from new sp. */
|
|
addi sp, 8
|
|
jsr a1
|
|
|
|
/* exit */
|
|
lrw r7, __NR_exit
|
|
trap 0
|
|
END (__thread_start)
|
|
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|