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target/riscv: Fix itrigger when icount is used 

When I boot a ubuntu image, QEMU output a "Bad icount read" message and exit.
The reason is that when execute helper_mret or helper_sret, it will
cause a call to icount_get_raw_locked (), which needs set can_do_io flag
on cpustate.

Thus we setting this flag when execute these two instructions.

Signed-off-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230324064011.976-1-zhiwei_liu@linux.alibaba.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit df3ac6da47)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
LIU Zhiwei 2023-03-24 14:40:11 +08:00 committed by Michael Tokarev
parent 89640e03ec
commit 666e6bbf85
1 changed files with 6 additions and 0 deletions
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6
target/riscv/insn_trans/trans_privileged.c.inc
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@ -77,6 +77,9 @@ static bool trans_sret(DisasContext *ctx, arg_sret *a)
#ifndef CONFIG_USER_ONLY
if (has_ext(ctx, RVS)) {
decode_save_opc(ctx);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_sret(cpu_pc, cpu_env);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
@ -93,6 +96,9 @@ static bool trans_mret(DisasContext *ctx, arg_mret *a)
{
#ifndef CONFIG_USER_ONLY
decode_save_opc(ctx);
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_mret(cpu_pc, cpu_env);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;