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target/ppc: fix icount support on Book-e vms accessing SPRs 

Failing to guard SPR access with gen_io_start/gen_stop_exception
causes "Bad icount read" exceptions when running VMs with
e500mc and e500v2 CPUs with an icount parameter.

Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Greg Kurz <groug@kaod.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Vitaly Cheptsov <cheptsov@ispras.ru>
Message-Id: <20210303140851.78383-1-cheptsov@ispras.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Vitaly Cheptsov 2021-03-03 17:08:51 +03:00 committed by David Gibson
parent 4515a5f786
commit 09db2216aa
1 changed files with 36 additions and 0 deletions
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36
target/ppc/translate_init.c.inc
View File

@ -567,35 +567,71 @@ static void spr_write_601_ubatl(DisasContext *ctx, int sprn, int gprn)
#if !defined(CONFIG_USER_ONLY)
static void spr_read_40x_pit(DisasContext *ctx, int gprn, int sprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_load_40x_pit(cpu_gpr[gprn], cpu_env);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_40x_pit(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_40x_pit(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_40x_dbcr0(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_store_spr(sprn, cpu_gpr[gprn]);
gen_helper_store_40x_dbcr0(cpu_env, cpu_gpr[gprn]);
/* We must stop translation as we may have rebooted */
gen_stop_exception(ctx);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_40x_sler(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_40x_sler(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_booke_tcr(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_booke_tcr(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_booke_tsr(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_booke_tsr(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
#endif