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authorThomas Huth <thuth@linux.vnet.ibm.com>2015-02-12 18:09:35 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-02-18 09:37:15 +0100
commit57b22fc7920ff1bc40ea7f800a8b83520a1aa244 (patch)
tree02d390f14408c19d2a2dd8dfec7b5cec0d4518c5 /target-s390x/ioinst.c
parent234d9b1d3c5a0c87b9f41f7350bcf8c07a992864 (diff)
s390x/ioinst: Rework memory access in STSCH instruction
Change the handler for STSCH to use the new logical memory access functions. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'target-s390x/ioinst.c')
-rw-r--r--target-s390x/ioinst.c36
1 files changed, 22 insertions, 14 deletions
diff --git a/target-s390x/ioinst.c b/target-s390x/ioinst.c
index 0ef7a93a9f..23c2fafb65 100644
--- a/target-s390x/ioinst.c
+++ b/target-s390x/ioinst.c
@@ -284,8 +284,7 @@ void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb)
SubchDev *sch;
uint64_t addr;
int cc;
- SCHIB *schib;
- hwaddr len = sizeof(*schib);
+ SCHIB schib;
CPUS390XState *env = &cpu->env;
addr = decode_basedisp_s(env, ipb);
@@ -293,21 +292,23 @@ void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb)
program_interrupt(env, PGM_SPECIFICATION, 2);
return;
}
- schib = s390_cpu_physical_memory_map(env, addr, &len, 1);
- if (!schib || len != sizeof(*schib)) {
- program_interrupt(env, PGM_ADDRESSING, 2);
- goto out;
- }
if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
- program_interrupt(env, PGM_OPERAND, 2);
- goto out;
+ /*
+ * As operand exceptions have a lower priority than access exceptions,
+ * we check whether the memory area is writeable (injecting the
+ * access execption if it is not) first.
+ */
+ if (!s390_cpu_virt_mem_check_write(cpu, addr, sizeof(schib))) {
+ program_interrupt(env, PGM_OPERAND, 2);
+ }
+ return;
}
trace_ioinst_sch_id("stsch", cssid, ssid, schid);
sch = css_find_subch(m, cssid, ssid, schid);
if (sch) {
if (css_subch_visible(sch)) {
- css_do_stsch(sch, schib);
+ css_do_stsch(sch, &schib);
cc = 0;
} else {
/* Indicate no more subchannels in this css/ss */
@@ -318,14 +319,21 @@ void ioinst_handle_stsch(S390CPU *cpu, uint64_t reg1, uint32_t ipb)
cc = 3; /* No more subchannels in this css/ss */
} else {
/* Store an empty schib. */
- memset(schib, 0, sizeof(*schib));
+ memset(&schib, 0, sizeof(schib));
cc = 0;
}
}
+ if (cc != 3) {
+ if (s390_cpu_virt_mem_write(cpu, addr, &schib, sizeof(schib)) != 0) {
+ return;
+ }
+ } else {
+ /* Access exceptions have a higher priority than cc3 */
+ if (s390_cpu_virt_mem_check_write(cpu, addr, sizeof(schib)) != 0) {
+ return;
+ }
+ }
setcc(cpu, cc);
-
-out:
- s390_cpu_physical_memory_unmap(env, schib, len, 1);
}
int ioinst_handle_tsch(CPUS390XState *env, uint64_t reg1, uint32_t ipb)