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arm64: context-switch user tls register tpidr_el0 for compat tasks

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Since commit a4780adeef ("ARM: 7735/2: Preserve the user r/w register
TPIDRURW on context switch and fork"), arch/arm/ has context switched
the user-writable TLS register, so do the same for compat tasks running
under the arm64 kernel.

Reported-by: André Hentschel <nerv@dawncrow.de>
Tested-by: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon
2015-05-27 15:39:40 +01:00
committed by Catalin Marinas
parent 05981277a4
commit d00a3810c1
2 changed files with 38 additions and 28 deletions
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19
arch/arm64/include/asm/processor.h
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@@ -78,13 +78,30 @@ struct cpu_context {
struct thread_struct {
struct cpu_context cpu_context; /* cpu context */
unsigned long tp_value;
unsigned long tp_value; /* TLS register */
#ifdef CONFIG_COMPAT
unsigned long tp2_value;
#endif
struct fpsimd_state fpsimd_state;
unsigned long fault_address; /* fault info */
unsigned long fault_code; /* ESR_EL1 value */
struct debug_info debug; /* debugging */
};
#ifdef CONFIG_COMPAT
#define task_user_tls(t) \
({ \
unsigned long *__tls; \
if (is_compat_thread(task_thread_info(t))) \
__tls = &(t)->thread.tp2_value; \
else \
__tls = &(t)->thread.tp_value; \
__tls; \
})
#else
#define task_user_tls(t) (&(t)->thread.tp_value)
#endif
#define INIT_THREAD { }
static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)