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target-s390x: basic PER event handling

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This patch add basic support to generate PER exceptions. It adds two
fields to the cpu structure to record for the PER address and PER
code & ATMID values. When an exception is triggered and a PER event is
pending, the two PER values are copied to the lowcore area.

At the end of an instruction, an helper is checking for a possible
pending PER event and triggers an exception in that case. For that to
work with branches, we need to disable TB chaining when PER is
activated. Fortunately it's already in the TB flags.

Finally in case of a SERVICE CALL exception, we need to trigger the PER
exception immediately after.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aurelien Jarno 2015-06-13 00:45:56 +02:00 • committed by Alexander Graf
parent d453d10383
commit 777c98c32c
5 changed files with 71 additions and 20 deletions
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54
target-s390x/helper.c
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@ -250,25 +250,6 @@ void do_restart_interrupt(CPUS390XState *env)
load_psw(env, mask, addr);
}
static void do_svc_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
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);
lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
mask = be64_to_cpu(lowcore->svc_new_psw.mask);
addr = be64_to_cpu(lowcore->svc_new_psw.addr);
cpu_unmap_lowcore(lowcore);
load_psw(env, mask, addr);
}
static void do_program_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
@ -292,6 +273,14 @@ static void do_program_interrupt(CPUS390XState *env)
lowcore = cpu_map_lowcore(env);
/* Signal PER events with the exception. */
if (env->per_perc_atmid) {
env->int_pgm_code |= PGM_PER;
lowcore->per_address = cpu_to_be64(env->per_address);
lowcore->per_perc_atmid = cpu_to_be16(env->per_perc_atmid);
env->per_perc_atmid = 0;
}
lowcore->pgm_ilen = cpu_to_be16(ilen);
lowcore->pgm_code = cpu_to_be16(env->int_pgm_code);
lowcore->program_old_psw.mask = cpu_to_be64(get_psw_mask(env));
@ -308,6 +297,33 @@ static void do_program_interrupt(CPUS390XState *env)
load_psw(env, mask, addr);
}
static void do_svc_interrupt(CPUS390XState *env)
{
uint64_t mask, addr;
LowCore *lowcore;
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);
lowcore->svc_old_psw.mask = cpu_to_be64(get_psw_mask(env));
lowcore->svc_old_psw.addr = cpu_to_be64(env->psw.addr + env->int_svc_ilen);
mask = be64_to_cpu(lowcore->svc_new_psw.mask);
addr = be64_to_cpu(lowcore->svc_new_psw.addr);
cpu_unmap_lowcore(lowcore);
load_psw(env, mask, addr);
/* When a PER event is pending, the PER exception has to happen
immediately after the SERVICE CALL one. */
if (env->per_perc_atmid) {
env->int_pgm_code = PGM_PER;
env->int_pgm_ilen = env->int_svc_ilen;
do_program_interrupt(env);
}
}
#define VIRTIO_SUBCODE_64 0x0D00
static void do_ext_interrupt(CPUS390XState *env)