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target/ppc: Integrate icount to purr, vtb, and tbu40 

Currently if option '-icount auto' is passed to the QEMU TCG to enable
counting instructions the VM crashes with the following error report when
Linux runs on it:

qemu-system-ppc64: Bad icount read

This happens because read/write access to the SPRs PURR, VTB, and TBU40
is not integrated to the icount framework.

This commit fixes that issue by making the read/write access of these
SPRs aware of icount framework, adding the proper gen_io_start() calls
before calling the helpers to load/store these SPRs in TCG and ensuring
that the associated TBs end immediately after, accordingly to what's in
docs/devel/tcg-icount.rst.

Signed-off-by: Gustavo Romero <gromero@linux.ibm.com>
Message-Id: <20200811153235.4527-1-gromero@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Gustavo Romero 2020-08-11 12:32:35 -03:00 committed by David Gibson
parent e781139539
commit a72c71b77d
1 changed files with 30 additions and 0 deletions
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30
target/ppc/translate_init.inc.c
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@ -284,12 +284,24 @@ static void spr_write_atbu(DisasContext *ctx, int sprn, int gprn)
ATTRIBUTE_UNUSED
static void spr_read_purr(DisasContext *ctx, int gprn, int sprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_load_purr(cpu_gpr[gprn], cpu_env);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_purr(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_purr(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
/* HDECR */
@ -319,17 +331,35 @@ static void spr_write_hdecr(DisasContext *ctx, int sprn, int gprn)
static void spr_read_vtb(DisasContext *ctx, int gprn, int sprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_load_vtb(cpu_gpr[gprn], cpu_env);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_vtb(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_vtb(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
static void spr_write_tbu40(DisasContext *ctx, int sprn, int gprn)
{
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_store_tbu40(cpu_env, cpu_gpr[gprn]);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_stop_exception(ctx);
}
}
#endif