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s390/ptrace: add struct psw and accessor function

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Introduce a 'struct psw' which makes it easier to decode and test if
certain bits in a psw are set or are not set.
In addition also add a 'psw_bits()' helper define which allows to
directly modify and test a psw_t structure. E.g.

psw_t psw;
psw_bits(psw).t = 1; /* set dat bit */

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-01-01 16:08:06 +01:00 committed by Christian Borntraeger
parent 280ef0f1f9
commit 1365632bde
1 changed files with 44 additions and 0 deletions
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44
arch/s390/include/asm/ptrace.h
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@ -16,6 +16,50 @@
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
struct psw_bits {
unsigned long long : 1;
unsigned long long r : 1; /* PER-Mask */
unsigned long long : 3;
unsigned long long t : 1; /* DAT Mode */
unsigned long long i : 1; /* Input/Output Mask */
unsigned long long e : 1; /* External Mask */
unsigned long long key : 4; /* PSW Key */
unsigned long long : 1;
unsigned long long m : 1; /* Machine-Check Mask */
unsigned long long w : 1; /* Wait State */
unsigned long long p : 1; /* Problem State */
unsigned long long as : 2; /* Address Space Control */
unsigned long long cc : 2; /* Condition Code */
unsigned long long pm : 4; /* Program Mask */
unsigned long long ri : 1; /* Runtime Instrumentation */
unsigned long long : 6;
unsigned long long eaba : 2; /* Addressing Mode */
#ifdef CONFIG_64BIT
unsigned long long : 31;
unsigned long long ia : 64;/* Instruction Address */
#else
unsigned long long ia : 31;/* Instruction Address */
#endif
};
enum {
PSW_AMODE_24BIT = 0,
PSW_AMODE_31BIT = 1,
PSW_AMODE_64BIT = 3
};
enum {
PSW_AS_PRIMARY = 0,
PSW_AS_ACCREG = 1,
PSW_AS_SECONDARY = 2,
PSW_AS_HOME = 3
};
#define psw_bits(__psw) (*({ \
typecheck(psw_t, __psw); \
&(*(struct psw_bits *)(&(__psw))); \
}))
/*
* The pt_regs struct defines the way the registers are stored on
* the stack during a system call.