On Fri, Feb 23, 2024 at 12:22 PM Alvin Chang via <qemu-devel@nongnu.org> wrote:
>
> We have implemented trigger_common_match(), which checks if the enabled
> privilege levels of the trigger match CPU's current privilege level.
> Remove the related code in riscv_cpu_debug_check_breakpoint() and invoke
> trigger_common_match() to check the privilege levels of the type 2 and
> type 6 triggers for the breakpoints.
>
> This commit also changes the behavior of looping the triggers. In
> previous implementation, if we have a type 2 trigger and
> env->virt_enabled is true, we directly return false to stop the loop.
> Now we keep looping all the triggers until we find a matched trigger.
>
> Only the execution bit and the executed PC should be futher checked in
> riscv_cpu_debug_check_breakpoint().
>
> Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
> target/riscv/debug.c | 26 ++++++--------------------
> 1 file changed, 6 insertions(+), 20 deletions(-)
>
> diff --git a/target/riscv/debug.c b/target/riscv/debug.c
> index 3891236b82..b7b0fa8945 100644
> --- a/target/riscv/debug.c
> +++ b/target/riscv/debug.c
> @@ -855,21 +855,17 @@ bool riscv_cpu_debug_check_breakpoint(CPUState *cs)
> for (i = 0; i < RV_MAX_TRIGGERS; i++) {
> trigger_type = get_trigger_type(env, i);
>
> + if (!trigger_common_match(env, trigger_type, i)) {
> + continue;
> + }
> +
> switch (trigger_type) {
> case TRIGGER_TYPE_AD_MATCH:
> - /* type 2 trigger cannot be fired in VU/VS mode */
> - if (env->virt_enabled) {
> - return false;
> - }
> -
> ctrl = env->tdata1[i];
> pc = env->tdata2[i];
>
> if ((ctrl & TYPE2_EXEC) && (bp->pc == pc)) {
> - /* check U/S/M bit against current privilege level */
> - if ((ctrl >> 3) & BIT(env->priv)) {
> - return true;
> - }
> + return true;
> }
> break;
> case TRIGGER_TYPE_AD_MATCH6:
> @@ -877,17 +873,7 @@ bool riscv_cpu_debug_check_breakpoint(CPUState *cs)
> pc = env->tdata2[i];
>
> if ((ctrl & TYPE6_EXEC) && (bp->pc == pc)) {
> - if (env->virt_enabled) {
> - /* check VU/VS bit against current privilege level */
> - if ((ctrl >> 23) & BIT(env->priv)) {
> - return true;
> - }
> - } else {
> - /* check U/S/M bit against current privilege level */
> - if ((ctrl >> 3) & BIT(env->priv)) {
> - return true;
> - }
> - }
> + return true;
> }
> break;
> default:
> --
> 2.34.1
>
>