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The FP status register allows for 6 traps to be masked. One of them,
the denormal/unnormal trap, is not a standard IEEE trap. We did not exclude it from being returned by fpgetmask(), nor did we make sure that fpsetmask() didn't clobber it. Since the non-IEEE trap is not part of fp_except_t, users of ifpgetmask()/fpsetmask() would be confronted with unexpected behaviour, one of which is a SIGFPE for denormal/unnormal FP results. This commit makes sure that we don't leak the denormal/unnormal mask bit in fp_except_t and also that we don't clobber it.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=121332
@ -36,5 +36,5 @@ fpgetmask(void)
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u_int64_t fpsr;
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__asm __volatile("mov %0=ar.fpsr" : "=r" (fpsr));
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return (~fpsr & 0x3f);
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return (~fpsr & 0x3d);
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}
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@ -37,8 +37,8 @@ fpsetmask(fp_except_t mask)
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u_int64_t oldmask;
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__asm __volatile("mov %0=ar.fpsr" : "=r" (fpsr));
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oldmask = ~fpsr & 0x3f;
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fpsr = (fpsr & ~0x3f) | (~mask & 0x3f);
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oldmask = ~fpsr & 0x3d;
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fpsr = (fpsr & ~0x3d) | (~mask & 0x3d);
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__asm __volatile("mov ar.fpsr=%0" :: "r" (fpsr));
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return (oldmask);
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}
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