riscv: Implement copy_thread_tls
commit 20bda4ed62
upstream.
This is required for clone3 which passes the TLS value through a
struct rather than a register.
Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: linux-riscv@lists.infradead.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-6-amanieu@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
parent
0bdd4e601a
commit
0b6a32ef88
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@ -61,6 +61,7 @@ config RISCV
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select SPARSEMEM_STATIC if 32BIT
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select SPARSEMEM_STATIC if 32BIT
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select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
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select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
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select HAVE_ARCH_MMAP_RND_BITS
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select HAVE_ARCH_MMAP_RND_BITS
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select HAVE_COPY_THREAD_TLS
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config ARCH_MMAP_RND_BITS_MIN
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config ARCH_MMAP_RND_BITS_MIN
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default 18 if 64BIT
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default 18 if 64BIT
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@ -99,8 +99,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
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return 0;
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return 0;
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}
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}
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int copy_thread(unsigned long clone_flags, unsigned long usp,
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int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
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unsigned long arg, struct task_struct *p)
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unsigned long arg, struct task_struct *p, unsigned long tls)
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{
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{
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struct pt_regs *childregs = task_pt_regs(p);
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struct pt_regs *childregs = task_pt_regs(p);
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@ -120,7 +120,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
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if (usp) /* User fork */
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if (usp) /* User fork */
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childregs->sp = usp;
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childregs->sp = usp;
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if (clone_flags & CLONE_SETTLS)
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if (clone_flags & CLONE_SETTLS)
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childregs->tp = childregs->a5;
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childregs->tp = tls;
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childregs->a0 = 0; /* Return value of fork() */
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childregs->a0 = 0; /* Return value of fork() */
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p->thread.ra = (unsigned long)ret_from_fork;
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p->thread.ra = (unsigned long)ret_from_fork;
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}
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}
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