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signal: Add FPE_FLTUNK si_code for undiagnosable fp exceptions

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Some architectures cannot always report accurately what kind of
floating-point exception triggered a floating-point exception trap.

This can occur with fp exceptions occurring on lanes in a vector
instruction on arm64 for example.

Rather than have every architecture come up with its own way of
describing such a condition, this patch adds a common FPE_FLTUNK
si_code value to report that an fp exception caused a trap but we
cannot be certain which kind of fp exception it was.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Dave Martin 2018-03-01 17:44:06 +00:00 committed by Eric W. Biederman
parent f6a015498d
commit 266da65e91
2 changed files with 3 additions and 2 deletions
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2
arch/x86/kernel/signal_compat.c
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@ -26,7 +26,7 @@ static inline void signal_compat_build_tests(void)
* new fields are handled in copy_siginfo_to_user32()!
*/
BUILD_BUG_ON(NSIGILL != 11);
BUILD_BUG_ON(NSIGFPE != 13);
BUILD_BUG_ON(NSIGFPE != 14);
BUILD_BUG_ON(NSIGSEGV != 4);
BUILD_BUG_ON(NSIGBUS != 5);
BUILD_BUG_ON(NSIGTRAP != 4);

3
include/uapi/asm-generic/siginfo.h
View File

@ -229,7 +229,8 @@ typedef struct siginfo {
# define __FPE_INVASC 12 /* invalid ASCII digit */
# define __FPE_INVDEC 13 /* invalid decimal digit */
#endif
#define NSIGFPE 13
#define FPE_FLTUNK 14 /* undiagnosed floating-point exception */
#define NSIGFPE 14
/*
* SIGSEGV si_codes