Attachment 165763 Details for Bug 206370 – fpu zero-ing diff

[patch] fpu zero-ing diff

fpu-zero.patch (text/plain), 1.11 KB, created by joss.upton on 2016-01-18 16:13:23 UTC

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Creator: joss.upton

Created: 2016-01-18 16:13:23 UTC

Size: 1.11 KB

patch

obsolete

>diff --git a/amd64/amd64/fpu.c b/amd64/amd64/fpu.c
>index 6f1db9f..ab2e307 100644
>--- a/amd64/amd64/fpu.c
>+++ b/amd64/amd64/fpu.c
>@@ -318,13 +318,14 @@ fpuinitstate(void *arg __unused)
> 		cpu_mxcsr_mask = 0xFFBF;
> 
> 	/*
>-	 * The fninit instruction does not modify XMM registers.  The
>-	 * fpusave call dumped the garbage contained in the registers
>-	 * after reset to the initial state saved.  Clear XMM
>-	 * registers file image to make the startup program state and
>-	 * signal handler XMM register content predictable.
>+	 * The fninit instruction does not modify XMM registers or FPU
>+	 * registers (MM/ST).  The fpusave call dumped the garbage contained
>+	 * in the registers after reset to the initial state saved.  Clear
>+	 * XMM and FPU registers file image to make the startup program state
>+	 * and signal handler XMM register content predictable.
> 	 */
>-	bzero(&fpu_initialstate->sv_xmm[0], sizeof(struct xmmacc));
>+	bzero(&fpu_initialstate->sv_fp[0], sizeof(fpu_initialstate->sv_fp));
>+	bzero(&fpu_initialstate->sv_xmm[0], sizeof(fpu_initialstate->sv_xmm));
> 
> 	/*
> 	 * Create a table describing the layout of the CPU Extended

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