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| author | Andreas Oetken <andreas.oetken@siemens.com> | 2021-02-19 14:41:03 +0800 |
|---|---|---|
| committer | Ley Foon Tan <ley.foon.tan@intel.com> | 2021-02-19 15:02:08 +0800 |
| commit | 9abcfcb20320e8f693e89d86573b58e6289931cb (patch) | |
| tree | ad794fe45d0c5ce36849ccf39c46565e2548dcca /arch/nios2 | |
| parent | c26958cb5a0d9053d1358258827638773f3d36ed (diff) | |
| download | linux-9abcfcb20320e8f693e89d86573b58e6289931cb.tar.gz | |
nios2: fixed broken sys_clone syscall
The tls pointer must be pushed on the stack prior to calling nios2_clone
as it is the 5th function argument. Prior handling of the tls pointer was
done inside former called function copy_thread_tls using the r8 register
from the current_pt_regs directly. This was a bad design and resulted in
the current bug introduced in 04bd52fb.
Fixes: 04bd52fb ("nios2: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone_args")
Signed-off-by: Andreas Oetken <andreas.oetken@siemens.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'arch/nios2')
| -rw-r--r-- | arch/nios2/kernel/entry.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S index da8442450e46..0794cd7803df 100644 --- a/arch/nios2/kernel/entry.S +++ b/arch/nios2/kernel/entry.S @@ -389,7 +389,10 @@ ENTRY(ret_from_interrupt) */ ENTRY(sys_clone) SAVE_SWITCH_STACK + subi sp, sp, 4 /* make space for tls pointer */ + stw r8, 0(sp) /* pass tls pointer (r8) via stack (5th argument) */ call nios2_clone + addi sp, sp, 4 RESTORE_SWITCH_STACK ret |