函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\fpu\xstate.c Create Date:2022-07-27 08:50:54
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Weird legacy quirk: SSE and YMM states store information in the* MXCSR and MXCSR_FLAGS fields of the FP area. That means if the FP* area is marked as unused in the xfeatures header, we need to copy* MXCSR and MXCSR_FLAGS if either SSE or YMM are in use.

函数原型：static inline bool xfeatures_mxcsr_quirk(u64 xfeatures)

返回类型：bool

参数：

类型参数名称
u64xfeatures
950  如果非xfeatures按位与XFEATURE_MASK_SSE按位或XFEATURE_MASK_YMM的值的值则返回:false
953  如果xfeatures按位与XFEATURE_MASK_FP则返回:false
956  返回:true
调用者
名称描述
copy_xstate_to_kernelConvert from kernel XSAVES compacted format to standard format and copy* to a kernel-space ptrace buffer.* It supports partial copy but pos always starts from zero. This is called* from xstateregs_get() and there we check the CPU has XSAVES.
copy_xstate_to_userConvert from kernel XSAVES compacted format to standard format and copy* to a user-space buffer. It supports partial copy but pos always starts from* zero. This is called from xstateregs_get() and there we check the CPU* has XSAVES.
copy_kernel_to_xstateConvert from a ptrace standard-format kernel buffer to kernel XSAVES format* and copy to the target thread. This is called from xstateregs_set().
copy_user_to_xstateConvert from a ptrace or sigreturn standard-format user-space buffer to* kernel XSAVES format and copy to the target thread. This is called from* xstateregs_set(), as well as potentially from the sigreturn() and* rt_sigreturn() system calls.