From e805b793f7d4b3e8c37d540b7d6cc0c6ac682311 Mon Sep 17 00:00:00 2001
From: Xu Zou <
sendtozouxu@gmail.com>
Date: Fri, 14 May 2021 15:55:07 +0800
Subject: [PATCH] linux-user: Handle EXCP10_COPR properly for i386
Handle EXCP10_COPR properly for i386 in cpu loop.
NE flag is set to select native mode for handling floating-point
exceptions. FWAIT instruction can raise EXCP10_COPR exception by using
fpu_raise_exception() function.
The code is based on kernel's function fpu__exception_code() in
arch/x86/kernel/fpu/core.c.
Signed-off-by: Xu Zou <
sendtozouxu@gmail.com>
---
linux-user/i386/cpu_loop.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c
index f813e87294..e1f2911554 100644
--- a/linux-user/i386/cpu_loop.c
+++ b/linux-user/i386/cpu_loop.c
@@ -199,6 +199,8 @@ void cpu_loop(CPUX86State *env)
{
CPUState *cs = env_cpu(env);
int trapnr;
+ int si_code;
+ uint8_t status;
abi_ulong pc;
abi_ulong ret;
@@ -315,6 +317,28 @@ void cpu_loop(CPUX86State *env)
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
+ case EXCP10_COPR:
+ si_code = 0;
+ status = env->fp_status.float_exception_flags;
+ if (status & float_flag_invalid) {
+ si_code = TARGET_FPE_FLTINV;
+ }
+ if (status & float_flag_divbyzero) {
+ si_code = TARGET_FPE_FLTDIV;
+ }
+ if (status & float_flag_overflow) {
+ si_code = TARGET_FPE_FLTOVF;
+ }
+ if ((status & float_flag_underflow) ||
+ (status & float_flag_input_denormal) ||
+ (status & float_flag_output_denormal)) {
+ si_code = TARGET_FPE_FLTUND;
+ }
+ if (status & float_flag_inexact) {
+ si_code = TARGET_FPE_FLTRES;
+ }
+ gen_signal(env, TARGET_SIGFPE, si_code, env->eip);
+ break;
default:
pc = env->segs[R_CS].base + env->eip;
EXCP_DUMP(env, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
@@ -327,7 +351,7 @@ void cpu_loop(CPUX86State *env)
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
- env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
+ env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK | CR0_NE_MASK;
env->hflags |= HF_PE_MASK | HF_CPL_MASK;
if (env->features[FEAT_1_EDX] & CPUID_SSE) {
env->cr[4] |= CR4_OSFXSR_MASK;
--
2.25.1