[PATCH] Set the correct env->fpip for x86 float instructions

[Ziqiao Kong <ziqiaokong@gmail.com>]

Hello, everyone!

This patch follows https://lists.gnu.org/archive/html/qemu-devel/2010-11/msg02497.html and https://lists.gnu.org/archive/html/qemu-devel/2010-11/msg02497.html

It's my first time to submit a patch to qemu. Any advice is highly welcome!

Ziqiao
---
 target/i386/tcg/fpu_helper.c | 4 ++--
 target/i386/tcg/translate.c  | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/target/i386/tcg/fpu_helper.c b/target/i386/tcg/fpu_helper.c
index 60ed93520a..e8cbde4e1a 100644
--- a/target/i386/tcg/fpu_helper.c
+++ b/target/i386/tcg/fpu_helper.c
@@ -2395,7 +2395,7 @@ static void do_fstenv(CPUX86State *env, target_ulong ptr, int data32,
         cpu_stl_data_ra(env, ptr, env->fpuc, retaddr);
         cpu_stl_data_ra(env, ptr + 4, fpus, retaddr);
         cpu_stl_data_ra(env, ptr + 8, fptag, retaddr);
-        cpu_stl_data_ra(env, ptr + 12, 0, retaddr); /* fpip */
+        cpu_stl_data_ra(env, ptr + 12, env->fpip, retaddr); /* fpip */
         cpu_stl_data_ra(env, ptr + 16, 0, retaddr); /* fpcs */
         cpu_stl_data_ra(env, ptr + 20, 0, retaddr); /* fpoo */
         cpu_stl_data_ra(env, ptr + 24, 0, retaddr); /* fpos */
@@ -2404,7 +2404,7 @@ static void do_fstenv(CPUX86State *env, target_ulong ptr, int data32,
         cpu_stw_data_ra(env, ptr, env->fpuc, retaddr);
         cpu_stw_data_ra(env, ptr + 2, fpus, retaddr);
         cpu_stw_data_ra(env, ptr + 4, fptag, retaddr);
-        cpu_stw_data_ra(env, ptr + 6, 0, retaddr);
+        cpu_stw_data_ra(env, ptr + 6, env->fpip, retaddr);
         cpu_stw_data_ra(env, ptr + 8, 0, retaddr);
         cpu_stw_data_ra(env, ptr + 10, 0, retaddr);
         cpu_stw_data_ra(env, ptr + 12, 0, retaddr);
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 880bc45561..cc4398f03b 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -6337,7 +6337,10 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
                 goto unknown_op;
             }
         }
+        tcg_gen_movi_tl(s->tmp0, pc_start - s->cs_base);
+        tcg_gen_st_tl(s->tmp0, cpu_env, offsetof(CPUX86State, fpip));
         break;
+
         /************************/
         /* string ops */
 
-- 
2.25.1