check_for_xstate

Name:Check for the presence of extended state information in the* user fpstate pointer in the sigcontext.

Proto:static inline int check_for_xstate(struct fxregs_state __user *buf, void __user *fpstate, struct _fpx_sw_bytes *fx_sw)

Type:int

Parameter:

Type	Parameter	Name
struct fxregs_state __user *	buf
void __user *	fpstate
struct _fpx_sw_bytes *	fx_sw

28

min_xstate_size = sizeof(structfxregs_state) + sizeof(structxstate_header)

32

If __copy_from_user(fx_sw, & sw_reserved[0], size of fx_sw ) Then Return -1

36

If If set to FP_XSTATE_MAGIC1 then this is an xstate context.* 0 if a legacy frame. != FP_XSTATE_MAGIC1 || Actual XSAVE state size, based on the xfeatures saved in the layout.* 'extended_size' is greater than 'xstate_size': < min_xstate_size || Actual XSAVE state size, based on the xfeatures saved in the layout.* 'extended_size' is greater than 'xstate_size': > fpu_user_xstate_size || Actual XSAVE state size, based on the xfeatures saved in the layout.* 'extended_size' is greater than 'xstate_size': > Total size of the fpstate area:* - if magic1 == 0 then it's sizeof(struct _fpstate)* - if magic1 == FP_XSTATE_MAGIC1 then it's sizeof(struct _xstate)* plus extensions (if any) Then Return -1

48

If Get a simple variable from user space, with less checking(magic2, (__u32 __user * )(fpstate + Actual XSAVE state size, based on the xfeatures saved in the layout.* 'extended_size' is greater than 'xstate_size':)) || magic2 != FP_XSTATE_MAGIC2 Then Return -1

52

Return 0

**Caller**
Name	Describe
__fpu__restore_sig

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