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s390/traps: get rid of magic cast for program interruption code 

Add a proper union in lowcore to reflect architecture and get rid of a
"magic" cast in order to read the full program interruption code.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-03-06 11:15:27 +01:00 committed by Vasily Gorbik
parent 0ecf337fa2
commit 52b739e278
2 changed files with 8 additions and 3 deletions
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9
arch/s390/include/asm/lowcore.h
View File

@ -34,8 +34,13 @@ struct lowcore {
__u32 ext_int_code_addr;
};
__u32 svc_int_code; /* 0x0088 */
__u16 pgm_ilc; /* 0x008c */
__u16 pgm_code; /* 0x008e */
union {
struct {
__u16 pgm_ilc; /* 0x008c */
__u16 pgm_code; /* 0x008e */
};
__u32 pgm_int_code;
};
__u32 data_exc_code; /* 0x0090 */
__u16 mon_class_num; /* 0x0094 */
__u8 per_code; /* 0x0096 */

2
arch/s390/kernel/traps.c
View File

@ -297,7 +297,7 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
unsigned int trapnr;
irqentry_state_t state;
regs->int_code = *(u32 *)&S390_lowcore.pgm_ilc;
regs->int_code = S390_lowcore.pgm_int_code;
regs->int_parm_long = S390_lowcore.trans_exc_code;
state = irqentry_enter(regs);