4725c86055
The FPC_VALID_MASK has been used to check the validity of the value to be loaded into the floating-point-control register. With the introduction of the floating-point extension facility and the decimal-floating-point additional bits have been defined which need to be checked in a non straight forward way. So far these bits have been ignored which can cause an incorrect results for decimal- floating-point operations, e.g. an incorrect rounding mode to be set after signal return. The static check with the FPC_VALID_MASK is replaced with a trial load of the floating-point-control value, see test_fp_ctl. In addition an information leak with the padding word between the floating-point-control word and the floating-point registers in the s390_fp_regs is fixed. Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/*
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* S390 version
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* Copyright IBM Corp. 1999, 2000
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*/
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#ifndef _ASM_S390_SIGCONTEXT_H
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#define _ASM_S390_SIGCONTEXT_H
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#include <linux/compiler.h>
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#define __NUM_GPRS 16
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#define __NUM_FPRS 16
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#define __NUM_ACRS 16
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#ifndef __s390x__
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/* Has to be at least _NSIG_WORDS from asm/signal.h */
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#define _SIGCONTEXT_NSIG 64
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#define _SIGCONTEXT_NSIG_BPW 32
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/* Size of stack frame allocated when calling signal handler. */
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#define __SIGNAL_FRAMESIZE 96
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#else /* __s390x__ */
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/* Has to be at least _NSIG_WORDS from asm/signal.h */
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#define _SIGCONTEXT_NSIG 64
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#define _SIGCONTEXT_NSIG_BPW 64
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/* Size of stack frame allocated when calling signal handler. */
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#define __SIGNAL_FRAMESIZE 160
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#endif /* __s390x__ */
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#define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
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#define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
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typedef struct
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{
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unsigned long mask;
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unsigned long addr;
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} __attribute__ ((aligned(8))) _psw_t;
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typedef struct
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{
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_psw_t psw;
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unsigned long gprs[__NUM_GPRS];
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unsigned int acrs[__NUM_ACRS];
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} _s390_regs_common;
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typedef struct
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{
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unsigned int fpc;
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unsigned int pad;
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double fprs[__NUM_FPRS];
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} _s390_fp_regs;
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typedef struct
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{
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_s390_regs_common regs;
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_s390_fp_regs fpregs;
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} _sigregs;
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struct sigcontext
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{
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unsigned long oldmask[_SIGCONTEXT_NSIG_WORDS];
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_sigregs __user *sregs;
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};
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#endif
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