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s390/traps: Copy monitor code to pt_regs

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In case of a monitor call program check the CPU stores the monitor code to
lowcore. Let the program check handler copy it to the pt_regs structure so
it can be used by the monitor call exception handler.

Instead of increasing the pt_regs size add a union which contains both
orig_gpr2 and monitor_code, since orig_gpr2 is not used in case of a
program check.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2026-01-09 16:31:40 +01:00
parent 8cbfd13601
commit ee44f4e7eb
2 changed files with 5 additions and 1 deletions
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5
arch/s390/include/asm/ptrace.h
View file

@ -120,7 +120,10 @@ struct pt_regs {
unsigned long gprs[NUM_GPRS];
};
};
unsigned long orig_gpr2;
union {
unsigned long orig_gpr2;
unsigned long monitor_code;
};
union {
struct {
unsigned int int_code;

1
arch/s390/kernel/traps.c
View file

@ -298,6 +298,7 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
teid.val = lc->trans_exc_code;
regs->int_code = lc->pgm_int_code;
regs->int_parm_long = teid.val;
regs->monitor_code = lc->monitor_code;
/*
* In case of a guest fault, short-circuit the fault handler and return.
* This way the sie64a() function will return 0; fault address and