haraldwolff/qemu-patch-raspberry4
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target/arm: Allow EL change hooks to do IO

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During code generation, surround CPSR writes and exception returns which
call the EL change hooks with gen_io_start/end. The immediate need is
for the PMU to access the clock and icount during EL change to support
mode filtering.

Signed-off-by: Aaron Lindsay <alindsay@codeaurora.org>
Message-id: 1523997485-1905-9-git-send-email-alindsay@codeaurora.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Aaron Lindsay 2018-04-26 11:04:39 +01:00 committed by Peter Maydell
parent b5c53d1b38
commit e69ad9df6c
2 changed files with 18 additions and 0 deletions
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6
target/arm/translate-a64.c
View file

@ -1930,7 +1930,13 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
unallocated_encoding(s);
return;
}
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_exception_return(cpu_env);
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_end();
}
/* Must exit loop to check un-masked IRQs */
s->base.is_jmp = DISAS_EXIT;
return;

12
target/arm/translate.c
View file

@ -4548,7 +4548,13 @@ static void gen_rfe(DisasContext *s, TCGv_i32 pc, TCGv_i32 cpsr)
* appropriately depending on the new Thumb bit, so it must
* be called after storing the new PC.
*/
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_cpsr_write_eret(cpu_env, cpsr);
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_end();
}
tcg_temp_free_i32(cpsr);
/* Must exit loop to check un-masked IRQs */
s->base.is_jmp = DISAS_EXIT;
@ -9843,7 +9849,13 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
if (exc_return) {
/* Restore CPSR from SPSR. */
tmp = load_cpu_field(spsr);
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_start();
}
gen_helper_cpsr_write_eret(cpu_env, tmp);
if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
gen_io_end();
}
tcg_temp_free_i32(tmp);
/* Must exit loop to check un-masked IRQs */
s->base.is_jmp = DISAS_EXIT;