[PATCH 25/29] target/i386: Use cpu_unwind_state_data for tpr access

[Richard Henderson]

Avoid cpu_restore_state, and modifying env->eip out from
underneath the translator with TARGET_TB_PCREL.  There is
some slight duplication from x86_restore_state_to_opc,
but it's just a few lines.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1269
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/i386/helper.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/target/i386/helper.c b/target/i386/helper.c
index b62a1e48e2..2cd1756f1a 100644
--- a/target/i386/helper.c
+++ b/target/i386/helper.c
@@ -509,6 +509,23 @@ void cpu_x86_inject_mce(Monitor *mon, X86CPU *cpu, int 
bank,
     }
 }
 
+static target_ulong get_memio_eip(CPUX86State *env)
+{
+    uint64_t data[TARGET_INSN_START_WORDS];
+    CPUState *cs = env_cpu(env);
+
+    if (!cpu_unwind_state_data(cs, cs->mem_io_pc, data)) {
+        return env->eip;
+    }
+
+    /* Per x86_restore_state_to_opc. */
+    if (TARGET_TB_PCREL) {
+        return (env->eip & TARGET_PAGE_MASK) | data[0];
+    } else {
+        return data[0] - env->segs[R_CS].base;
+    }
+}
+
 void cpu_report_tpr_access(CPUX86State *env, TPRAccess access)
 {
     X86CPU *cpu = env_archcpu(env);
@@ -519,9 +536,9 @@ void cpu_report_tpr_access(CPUX86State *env, TPRAccess 
access)
 
         cpu_interrupt(cs, CPU_INTERRUPT_TPR);
     } else if (tcg_enabled()) {
-        cpu_restore_state(cs, cs->mem_io_pc, false);
+        target_ulong eip = get_memio_eip(env);
 
-        apic_handle_tpr_access_report(cpu->apic_state, env->eip, access);
+        apic_handle_tpr_access_report(cpu->apic_state, eip, access);
     }
 }
 #endif /* !CONFIG_USER_ONLY */
-- 
2.34.1