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target/avr: Disable interrupts when env->skip set 

This bit is not saved across interrupts, so we must
delay delivering the interrupt until the skip has
been processed.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1118
Reviewed-by: Michael Rolnik <mrolnik@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2022-08-26 13:53:32 -07:00
parent cecaad5401
commit 36027c7097
2 changed files with 31 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
target/avr/helper.c
View File

@ -31,6 +31,15 @@ bool avr_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
AVRCPU *cpu = AVR_CPU(cs);
CPUAVRState *env = &cpu->env;
/*
* We cannot separate a skip from the next instruction,
* as the skip would not be preserved across the interrupt.
* Separating the two insn normally only happens at page boundaries.
*/
if (env->skip) {
return false;
}
if (interrupt_request & CPU_INTERRUPT_RESET) {
if (cpu_interrupts_enabled(env)) {
cs->exception_index = EXCP_RESET;

26
target/avr/translate.c
View File

@ -2971,8 +2971,18 @@ static void avr_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
if (skip_label) {
canonicalize_skip(ctx);
gen_set_label(skip_label);
if (ctx->base.is_jmp == DISAS_NORETURN) {
switch (ctx->base.is_jmp) {
case DISAS_NORETURN:
ctx->base.is_jmp = DISAS_CHAIN;
break;
case DISAS_NEXT:
if (ctx->base.tb->flags & TB_FLAGS_SKIP) {
ctx->base.is_jmp = DISAS_TOO_MANY;
}
break;
default:
break;
}
}
@ -2989,6 +2999,11 @@ static void avr_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
bool nonconst_skip = canonicalize_skip(ctx);
/*
* Because we disable interrupts while env->skip is set,
* we must return to the main loop to re-evaluate afterward.
*/
bool force_exit = ctx->base.tb->flags & TB_FLAGS_SKIP;
switch (ctx->base.is_jmp) {
case DISAS_NORETURN:
@ -2997,7 +3012,7 @@ static void avr_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
case DISAS_NEXT:
case DISAS_TOO_MANY:
case DISAS_CHAIN:
if (!nonconst_skip) {
if (!nonconst_skip && !force_exit) {
/* Note gen_goto_tb checks singlestep. */
gen_goto_tb(ctx, 1, ctx->npc);
break;
@ -3005,8 +3020,11 @@ static void avr_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
tcg_gen_movi_tl(cpu_pc, ctx->npc);
/* fall through */
case DISAS_LOOKUP:
tcg_gen_lookup_and_goto_ptr();
break;
if (!force_exit) {
tcg_gen_lookup_and_goto_ptr();
break;
}
/* fall through */
case DISAS_EXIT:
tcg_gen_exit_tb(NULL, 0);
break;