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s390: Fix error handling and condition code of service call 

Invalid sccb addresses will cause specification or addressing exception.
Lets add those checks. Furthermore, the good case (cc=0) was incorrect
for KVM, we did not set the CC at all. We now use return codes < 0
as program checks and return codes > 0 as condition code values.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2012-07-23 21:37:04 +00:00 committed by Alexander Graf
parent 03834e22ab
commit 9abf567d95
2 changed files with 21 additions and 11 deletions
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5
target-s390x/kvm.c
View File

@ -273,9 +273,10 @@ static int kvm_sclp_service_call(CPUS390XState *env, struct kvm_run *run,
code = env->regs[(ipbh0 & 0xf0) >> 4];
r = sclp_service_call(env, sccb, code);
if (r) {
setcc(env, 3);
if (r < 0) {
enter_pgmcheck(env, -r);
}
setcc(env, r);
return 0;
}

27
target-s390x/op_helper.c
View File

@ -19,6 +19,8 @@
*/
#include "cpu.h"
#include "memory.h"
#include "cputlb.h"
#include "dyngen-exec.h"
#include "host-utils.h"
#include "helper.h"
@ -2366,6 +2368,9 @@ static void ext_interrupt(CPUS390XState *env, int type, uint32_t param,
cpu_inject_ext(env, type, param, param64);
}
/*
* ret < 0 indicates program check, ret = 0,1,2,3 -> cc
*/
int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code)
{
int r = 0;
@ -2375,10 +2380,12 @@ int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code)
printf("sclp(0x%x, 0x%" PRIx64 ")\n", sccb, code);
#endif
/* basic checks */
if (!memory_region_is_ram(phys_page_find(sccb >> TARGET_PAGE_BITS)->mr)) {
return -PGM_ADDRESSING;
}
if (sccb & ~0x7ffffff8ul) {
fprintf(stderr, "KVM: invalid sccb address 0x%x\n", sccb);
r = -1;
goto out;
return -PGM_SPECIFICATION;
}
switch(code) {
@ -2405,22 +2412,24 @@ int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code)
#ifdef DEBUG_HELPER
printf("KVM: invalid sclp call 0x%x / 0x%" PRIx64 "x\n", sccb, code);
#endif
r = -1;
r = 3;
break;
}
out:
return r;
}
/* SCLP service call */
uint32_t HELPER(servc)(uint32_t r1, uint64_t r2)
{
if (sclp_service_call(env, r1, r2)) {
return 3;
}
int r;
return 0;
r = sclp_service_call(env, r1, r2);
if (r < 0) {
program_interrupt(env, -r, 4);
return 0;
}
return r;
}
/* DIAG */