aboutsummaryrefslogtreecommitdiff
path: root/target-arm
diff options
context:
space:
mode:
Diffstat (limited to 'target-arm')
-rw-r--r--target-arm/cpu-qom.h2
-rw-r--r--target-arm/cpu64.c1
-rw-r--r--target-arm/helper-a64.c76
-rw-r--r--target-arm/helper.h1
-rw-r--r--target-arm/op_helper.c60
-rw-r--r--target-arm/translate-a64.c3
6 files changed, 143 insertions, 0 deletions
diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
index 41caa6c780..afdee9d683 100644
--- a/target-arm/cpu-qom.h
+++ b/target-arm/cpu-qom.h
@@ -202,6 +202,8 @@ void aarch64_cpu_dump_state(CPUState *cs, FILE *f,
fprintf_function cpu_fprintf, int flags);
int aarch64_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int aarch64_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
+
+void aarch64_cpu_do_interrupt(CPUState *cs);
#endif
#endif
diff --git a/target-arm/cpu64.c b/target-arm/cpu64.c
index fccecc2527..d4fb1de4fa 100644
--- a/target-arm/cpu64.c
+++ b/target-arm/cpu64.c
@@ -85,6 +85,7 @@ static void aarch64_cpu_class_init(ObjectClass *oc, void *data)
{
CPUClass *cc = CPU_CLASS(oc);
+ cc->do_interrupt = aarch64_cpu_do_interrupt;
cc->dump_state = aarch64_cpu_dump_state;
cc->set_pc = aarch64_cpu_set_pc;
cc->gdb_read_register = aarch64_cpu_gdb_read_register;
diff --git a/target-arm/helper-a64.c b/target-arm/helper-a64.c
index ec0258295f..bf921ccdc0 100644
--- a/target-arm/helper-a64.c
+++ b/target-arm/helper-a64.c
@@ -23,6 +23,7 @@
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "qemu/bitops.h"
+#include "internals.h"
/* C2.4.7 Multiply and divide */
/* special cases for 0 and LLONG_MIN are mandated by the standard */
@@ -436,3 +437,78 @@ float32 HELPER(fcvtx_f64_to_f32)(float64 a, CPUARMState *env)
set_float_exception_flags(exflags, fpst);
return r;
}
+
+/* Handle a CPU exception. */
+void aarch64_cpu_do_interrupt(CPUState *cs)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ target_ulong addr = env->cp15.c12_vbar;
+ int i;
+
+ if (arm_current_pl(env) == 0) {
+ if (env->aarch64) {
+ addr += 0x400;
+ } else {
+ addr += 0x600;
+ }
+ } else if (pstate_read(env) & PSTATE_SP) {
+ addr += 0x200;
+ }
+
+ arm_log_exception(cs->exception_index);
+ qemu_log_mask(CPU_LOG_INT, "...from EL%d\n", arm_current_pl(env));
+ if (qemu_loglevel_mask(CPU_LOG_INT)
+ && !excp_is_internal(cs->exception_index)) {
+ qemu_log_mask(CPU_LOG_INT, "...with ESR 0x%" PRIx32 "\n",
+ env->exception.syndrome);
+ }
+
+ env->cp15.esr_el1 = env->exception.syndrome;
+ env->cp15.far_el1 = env->exception.vaddress;
+
+ switch (cs->exception_index) {
+ case EXCP_PREFETCH_ABORT:
+ case EXCP_DATA_ABORT:
+ qemu_log_mask(CPU_LOG_INT, "...with FAR 0x%" PRIx64 "\n",
+ env->cp15.far_el1);
+ break;
+ case EXCP_BKPT:
+ case EXCP_UDEF:
+ case EXCP_SWI:
+ break;
+ case EXCP_IRQ:
+ addr += 0x80;
+ break;
+ case EXCP_FIQ:
+ addr += 0x100;
+ break;
+ default:
+ cpu_abort(cs, "Unhandled exception 0x%x\n", cs->exception_index);
+ }
+
+ if (is_a64(env)) {
+ env->banked_spsr[0] = pstate_read(env);
+ env->sp_el[arm_current_pl(env)] = env->xregs[31];
+ env->xregs[31] = env->sp_el[1];
+ env->elr_el1 = env->pc;
+ } else {
+ env->banked_spsr[0] = cpsr_read(env);
+ if (!env->thumb) {
+ env->cp15.esr_el1 |= 1 << 25;
+ }
+ env->elr_el1 = env->regs[15];
+
+ for (i = 0; i < 15; i++) {
+ env->xregs[i] = env->regs[i];
+ }
+
+ env->condexec_bits = 0;
+ }
+
+ pstate_write(env, PSTATE_DAIF | PSTATE_MODE_EL1h);
+ env->aarch64 = 1;
+
+ env->pc = addr;
+ cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
+}
diff --git a/target-arm/helper.h b/target-arm/helper.h
index 597716924c..a5449e7b6f 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -66,6 +66,7 @@ DEF_HELPER_3(set_cp_reg64, void, env, ptr, i64)
DEF_HELPER_2(get_cp_reg64, i64, env, ptr)
DEF_HELPER_3(msr_i_pstate, void, env, i32, i32)
+DEF_HELPER_1(exception_return, void, env)
DEF_HELPER_2(get_r13_banked, i32, env, i32)
DEF_HELPER_3(set_r13_banked, void, env, i32, i32)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 64a33dd449..57e7d9c480 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -384,6 +384,66 @@ void HELPER(msr_i_pstate)(CPUARMState *env, uint32_t op, uint32_t imm)
}
}
+void HELPER(exception_return)(CPUARMState *env)
+{
+ uint32_t spsr = env->banked_spsr[0];
+ int new_el, i;
+
+ if (env->pstate & PSTATE_SP) {
+ env->sp_el[1] = env->xregs[31];
+ } else {
+ env->sp_el[0] = env->xregs[31];
+ }
+
+ env->exclusive_addr = -1;
+
+ if (spsr & PSTATE_nRW) {
+ env->aarch64 = 0;
+ new_el = 0;
+ env->uncached_cpsr = 0x10;
+ cpsr_write(env, spsr, ~0);
+ for (i = 0; i < 15; i++) {
+ env->regs[i] = env->xregs[i];
+ }
+
+ env->regs[15] = env->elr_el1 & ~0x1;
+ } else {
+ new_el = extract32(spsr, 2, 2);
+ if (new_el > 1) {
+ /* Return to unimplemented EL */
+ goto illegal_return;
+ }
+ if (extract32(spsr, 1, 1)) {
+ /* Return with reserved M[1] bit set */
+ goto illegal_return;
+ }
+ if (new_el == 0 && (spsr & PSTATE_SP)) {
+ /* Return to EL1 with M[0] bit set */
+ goto illegal_return;
+ }
+ env->aarch64 = 1;
+ pstate_write(env, spsr);
+ env->xregs[31] = env->sp_el[new_el];
+ env->pc = env->elr_el1;
+ }
+
+ return;
+
+illegal_return:
+ /* Illegal return events of various kinds have architecturally
+ * mandated behaviour:
+ * restore NZCV and DAIF from SPSR_ELx
+ * set PSTATE.IL
+ * restore PC from ELR_ELx
+ * no change to exception level, execution state or stack pointer
+ */
+ env->pstate |= PSTATE_IL;
+ env->pc = env->elr_el1;
+ spsr &= PSTATE_NZCV | PSTATE_DAIF;
+ spsr |= pstate_read(env) & ~(PSTATE_NZCV | PSTATE_DAIF);
+ pstate_write(env, spsr);
+}
+
/* ??? Flag setting arithmetic is awkward because we need to do comparisons.
The only way to do that in TCG is a conditional branch, which clobbers
all our temporaries. For now implement these as helper functions. */
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 4c5402a0f7..188287d031 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1512,6 +1512,9 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
tcg_gen_movi_i64(cpu_reg(s, 30), s->pc);
break;
case 4: /* ERET */
+ gen_helper_exception_return(cpu_env);
+ s->is_jmp = DISAS_JUMP;
+ return;
case 5: /* DRPS */
if (rn != 0x1f) {
unallocated_encoding(s);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-26 22:49:01 +0000