Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\fpu\regset.c Create Date:2022-07-28 07:49:40
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:xstateregs_get

Proto:int xstateregs_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf)

Type:int

Parameter:

TypeParameterName
struct task_struct *target
const struct user_regset *regset
unsigned intpos
unsigned intcount
void *kbuf
void __user *ubuf
80  fpu = Floating point and extended processor state
84  If Not boot_cpu_has(XSAVE/XRSTOR/XSETBV/XGETBV instructions ) Then Return -ENODEV
87  xsave = xsave
89  This function must be called before we read a task's fpstate
91  If using_compacted_format() Then
92  If kbuf Then ret = copy_xstate_to_kernel(kbuf, xsave, pos, count)
94  Else ret = copy_xstate_to_user(ubuf, xsave, pos, count)
96  Else
97  When executing XSAVEOPT (or other optimized XSAVE instructions), if* a processor implementation detects that an FPU state component is still* (or is again) in its initialized state, it may clear the corresponding* bit in the header
103  memcpy( & sw_reserved, xstate_fx_sw_bytes, size of xstate_fx_sw_bytes )
108  ret = These are helpers for writing regset get/set functions in arch code
110  Return ret