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s390: Lowcore mapping helper. 

Create a lowcore mapping helper that includes a check for sufficient
length.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Cornelia Huck 2013-01-24 02:28:01 +00:00 committed by Alexander Graf
parent 3ef669e194
commit 4782a23b27
1 changed files with 25 additions and 9 deletions
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34
target-s390x/helper.c
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@ -471,13 +471,31 @@ static uint64_t get_psw_mask(CPUS390XState *env)
return r;
}
static LowCore *cpu_map_lowcore(CPUS390XState *env)
{
LowCore *lowcore;
hwaddr len = sizeof(LowCore);
lowcore = cpu_physical_memory_map(env->psa, &len, 1);
if (len < sizeof(LowCore)) {
cpu_abort(env, "Could not map lowcore\n");
}
return lowcore;
}
static void cpu_unmap_lowcore(LowCore *lowcore)
{
cpu_physical_memory_unmap(lowcore, sizeof(LowCore), 1, sizeof(LowCore));
}
static void do_svc_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
hwaddr len = TARGET_PAGE_SIZE;
lowcore = cpu_physical_memory_map(env->psa, &len, 1);
lowcore = cpu_map_lowcore(env);
lowcore->svc_code = cpu_to_be16(env->int_svc_code);
lowcore->svc_ilen = cpu_to_be16(env->int_svc_ilen);
@ -486,7 +504,7 @@ static void do_svc_interrupt(CPUS390XState *env)
mask = be64_to_cpu(lowcore->svc_new_psw.mask);
addr = be64_to_cpu(lowcore->svc_new_psw.addr);
cpu_physical_memory_unmap(lowcore, len, 1, len);
cpu_unmap_lowcore(lowcore);
load_psw(env, mask, addr);
}
@ -495,7 +513,6 @@ static void do_program_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
hwaddr len = TARGET_PAGE_SIZE;
int ilen = env->int_pgm_ilen;
switch (ilen) {
@ -513,7 +530,7 @@ static void do_program_interrupt(CPUS390XState *env)
qemu_log_mask(CPU_LOG_INT, "%s: code=0x%x ilen=%d\n",
__func__, env->int_pgm_code, ilen);
lowcore = cpu_physical_memory_map(env->psa, &len, 1);
lowcore = cpu_map_lowcore(env);
lowcore->pgm_ilen = cpu_to_be16(ilen);
lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
@ -522,7 +539,7 @@ static void do_program_interrupt(CPUS390XState *env)
mask = be64_to_cpu(lowcore->program_new_psw.mask);
addr = be64_to_cpu(lowcore->program_new_psw.addr);
cpu_physical_memory_unmap(lowcore, len, 1, len);
cpu_unmap_lowcore(lowcore);
DPRINTF("%s: %x %x %" PRIx64 " %" PRIx64 "\n", __func__,
env->int_pgm_code, ilen, env->psw.mask,
@ -537,7 +554,6 @@ static void do_ext_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
hwaddr len = TARGET_PAGE_SIZE;
ExtQueue *q;
if (!(env->psw.mask & PSW_MASK_EXT)) {
@ -549,7 +565,7 @@ static void do_ext_interrupt(CPUS390XState *env)
}
q = &env->ext_queue[env->ext_index];
lowcore = cpu_physical_memory_map(env->psa, &len, 1);
lowcore = cpu_map_lowcore(env);
lowcore->ext_int_code = cpu_to_be16(q->code);
lowcore->ext_params = cpu_to_be32(q->param);
@ -560,7 +576,7 @@ static void do_ext_interrupt(CPUS390XState *env)
mask = be64_to_cpu(lowcore->external_new_psw.mask);
addr = be64_to_cpu(lowcore->external_new_psw.addr);
cpu_physical_memory_unmap(lowcore, len, 1, len);
cpu_unmap_lowcore(lowcore);
env->ext_index--;
if (env->ext_index == -1) {