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[S390] addressing mode limits and psw address wrapping

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An instruction with an address right below the adress limit for the
current addressing mode will wrap. The instruction restart logic in
the protection fault handler and the signal code need to follow the
wrapping rules to find the correct instruction address.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2011-10-30 15:16:48 +01:00
parent 20b40a794b
commit ccf45cafb0
4 changed files with 29 additions and 4 deletions
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2
arch/s390/mm/fault.c
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@ -393,7 +393,7 @@ void __kprobes do_protection_exception(struct pt_regs *regs, long pgm_int_code,
int fault;
/* Protection exception is suppressing, decrement psw address. */
regs->psw.addr -= (pgm_int_code >> 16);
regs->psw.addr = __rewind_psw(regs->psw, pgm_int_code >> 16);
/*
* Check for low-address protection. This needs to be treated
* as a special case because the translation exception code