Let's improve readability by:
* Using constants for the subcodes
* Moving parameter checking into a function
* Removing subcode > 6 check as the default case catches that
Signed-off-by: Janosch Frank <address@hidden>
Reviewed-by: Cornelia Huck <address@hidden>
Reviewed-by: Thomas Huth <address@hidden>
---
target/s390x/diag.c | 54 +++++++++++++++++++++++++++------------------
1 file changed, 32 insertions(+), 22 deletions(-)
diff --git a/target/s390x/diag.c b/target/s390x/diag.c
index 53c2f81f2a..18d33c8492 100644
--- a/target/s390x/diag.c
+++ b/target/s390x/diag.c
@@ -53,6 +53,29 @@ int handle_diag_288(CPUS390XState *env, uint64_t r1,
uint64_t r3)
#define DIAG_308_RC_NO_CONF 0x0102
#define DIAG_308_RC_INVALID 0x0402
+#define DIAG308_RESET_MOD_CLR 0
+#define DIAG308_RESET_LOAD_NORM 1
+#define DIAG308_LOAD_CLEAR 3
+#define DIAG308_LOAD_NORMAL_DUMP 4
+#define DIAG308_SET 5
+#define DIAG308_STORE 6
+
+static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
+ uintptr_t ra, bool write)
+{
+ if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
+ s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+ return -1;
+ }
+ if (!address_space_access_valid(&address_space_memory, addr,
+ sizeof(IplParameterBlock), write,
+ MEMTXATTRS_UNSPECIFIED)) {
+ s390_program_interrupt(env, PGM_ADDRESSING, ra);
+ return -1;
+ }
+ return 0;
+}
+
void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t
ra)
{
CPUState *cs = env_cpu(env);
@@ -65,30 +88,24 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1,
uint64_t r3, uintptr_t ra)
return;
}
- if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
+ if (subcode & ~0x0ffffULL) {
s390_program_interrupt(env, PGM_SPECIFICATION, ra);
return;
}
switch (subcode) {
- case 0:
+ case DIAG308_RESET_MOD_CLR:
s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
break;
- case 1:
+ case DIAG308_RESET_LOAD_NORM:
s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
break;
- case 3:
+ case DIAG308_LOAD_CLEAR:
+ /* Well we still lack the clearing bit... */
s390_ipl_reset_request(cs, S390_RESET_REIPL);
break;
- case 5:
- if ((r1 & 1) || (addr & 0x0fffULL)) {
- s390_program_interrupt(env, PGM_SPECIFICATION, ra);
- return;
- }
- if (!address_space_access_valid(&address_space_memory, addr,
- sizeof(IplParameterBlock), false,
- MEMTXATTRS_UNSPECIFIED)) {
- s390_program_interrupt(env, PGM_ADDRESSING, ra);
+ case DIAG308_SET:
+ if (diag308_parm_check(env, r1, addr, ra, false)) {
return;
}
iplb = g_new0(IplParameterBlock, 1);
@@ -110,15 +127,8 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1,
uint64_t r3, uintptr_t ra)
out:
g_free(iplb);
return;
- case 6:
- if ((r1 & 1) || (addr & 0x0fffULL)) {
- s390_program_interrupt(env, PGM_SPECIFICATION, ra);
- return;
- }
- if (!address_space_access_valid(&address_space_memory, addr,
- sizeof(IplParameterBlock), true,
- MEMTXATTRS_UNSPECIFIED)) {
- s390_program_interrupt(env, PGM_ADDRESSING, ra);
+ case DIAG308_STORE:
+ if (diag308_parm_check(env, r1, addr, ra, true)) {
return;
}
iplb = s390_ipl_get_iplb();