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s390x: Beautify diag308 handling 

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 <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20191127175046.4911-6-frankja@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Janosch Frank 2019-11-27 12:50:45 -05:00 committed by Cornelia Huck
parent eb8adcc3e9
commit 0b7fd817e0
1 changed files with 32 additions and 22 deletions
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54
target/s390x/diag.c
View File

@ -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();