LoongArch: Ensure FP/SIMD registers in the core dump file is up to date
[ Upstream commit656f9aec07
] This is a port of commit379eb01c21
("riscv: Ensure the value of FP registers in the core dump file is up to date"). The values of FP/SIMD registers in the core dump file come from the thread.fpu. However, kernel saves the FP/SIMD registers only before scheduling out the process. If no process switch happens during the exception handling, kernel will not have a chance to save the latest values of FP/SIMD registers. So it may cause their values in the core dump file incorrect. To solve this problem, force fpr_get()/simd_get() to save the FP/SIMD registers into the thread.fpu if the target task equals the current task. Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -117,16 +117,30 @@ static inline void restore_fp(struct task_struct *tsk)
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_restore_fp(&tsk->thread.fpu);
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}
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static inline union fpureg *get_fpu_regs(struct task_struct *tsk)
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static inline void save_fpu_regs(struct task_struct *tsk)
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{
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unsigned int euen;
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if (tsk == current) {
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preempt_disable();
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if (is_fpu_owner())
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euen = csr_read32(LOONGARCH_CSR_EUEN);
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#ifdef CONFIG_CPU_HAS_LASX
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if (euen & CSR_EUEN_LASXEN)
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_save_lasx(¤t->thread.fpu);
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else
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#endif
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#ifdef CONFIG_CPU_HAS_LSX
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if (euen & CSR_EUEN_LSXEN)
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_save_lsx(¤t->thread.fpu);
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else
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#endif
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if (euen & CSR_EUEN_FPEN)
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_save_fp(¤t->thread.fpu);
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preempt_enable();
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}
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return tsk->thread.fpu.fpr;
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}
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#endif /* _ASM_FPU_H */
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@ -147,6 +147,8 @@ static int fpr_get(struct task_struct *target,
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{
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int r;
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save_fpu_regs(target);
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if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
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r = gfpr_get(target, &to);
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else
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