[Qemu-devel] [PATCH 6/13] Switch self-modified code recompilation to next_cflags

[Jan Kiszka <jan.kiszka@siemens.com>]

Switching tb_invalidate_phys_page_range and tb_invalidate_phys_page over
to the new next_cflags scheme when self-modifying code was detected can
save a few lines of code and remove arch dependency.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 exec.c |   32 ++++----------------------------
 1 file changed, 4 insertions(+), 28 deletions(-)

Index: b/exec.c
===================================================================
--- a/exec.c
+++ b/exec.c
@@ -831,12 +831,11 @@ TranslationBlock *tb_gen_code(CPUState *
 void tb_invalidate_phys_page_range(target_phys_addr_t start, target_phys_addr_t end,
                                    int is_cpu_write_access)
 {
-    int n, current_tb_modified, current_tb_not_found, current_flags;
+    int n, current_tb_modified, current_tb_not_found;
     CPUState *env = cpu_single_env;
     PageDesc *p;
     TranslationBlock *tb, *tb_next, *current_tb, *saved_tb;
     target_ulong tb_start, tb_end;
-    target_ulong current_pc, current_cs_base;
 
     p = page_find(start >> TARGET_PAGE_BITS);
     if (!p)
@@ -853,9 +852,6 @@ void tb_invalidate_phys_page_range(targe
     current_tb_not_found = is_cpu_write_access;
     current_tb_modified = 0;
     current_tb = NULL; /* avoid warning */
-    current_pc = 0; /* avoid warning */
-    current_cs_base = 0; /* avoid warning */
-    current_flags = 0; /* avoid warning */
     tb = p->first_tb;
     while (tb != NULL) {
         n = (long)tb & 3;
@@ -892,14 +888,6 @@ void tb_invalidate_phys_page_range(targe
                 current_tb_modified = 1;
                 cpu_restore_state(current_tb, env,
                                   env->mem_io_pc, NULL);
-#if defined(TARGET_I386)
-                current_flags = env->hflags;
-                current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK));
-                current_cs_base = (target_ulong)env->segs[R_CS].base;
-                current_pc = current_cs_base + env->eip;
-#else
-#error unsupported CPU
-#endif
             }
 #endif /* TARGET_HAS_PRECISE_SMC */
             /* we need to do that to handle the case where a signal
@@ -933,7 +921,7 @@ void tb_invalidate_phys_page_range(targe
            modifying the memory. It will ensure that it cannot modify
            itself */
         env->current_tb = NULL;
-        tb_gen_code(env, current_pc, current_cs_base, current_flags, 1);
+        env->next_cflags = 1;
         cpu_resume_from_signal(env, NULL);
     }
 #endif
@@ -972,8 +960,7 @@ static inline void tb_invalidate_phys_pa
 static void tb_invalidate_phys_page(target_phys_addr_t addr,
                                     unsigned long pc, void *puc)
 {
-    int n, current_flags, current_tb_modified;
-    target_ulong current_pc, current_cs_base;
+    int n, current_tb_modified;
     PageDesc *p;
     TranslationBlock *tb, *current_tb;
 #ifdef TARGET_HAS_PRECISE_SMC
@@ -987,9 +974,6 @@ static void tb_invalidate_phys_page(targ
     tb = p->first_tb;
     current_tb_modified = 0;
     current_tb = NULL;
-    current_pc = 0; /* avoid warning */
-    current_cs_base = 0; /* avoid warning */
-    current_flags = 0; /* avoid warning */
 #ifdef TARGET_HAS_PRECISE_SMC
     if (tb && pc != 0) {
         current_tb = tb_find_pc(pc);
@@ -1009,14 +993,6 @@ static void tb_invalidate_phys_page(targ
 
             current_tb_modified = 1;
             cpu_restore_state(current_tb, env, pc, puc);
-#if defined(TARGET_I386)
-            current_flags = env->hflags;
-            current_flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK));
-            current_cs_base = (target_ulong)env->segs[R_CS].base;
-            current_pc = current_cs_base + env->eip;
-#else
-#error unsupported CPU
-#endif
         }
 #endif /* TARGET_HAS_PRECISE_SMC */
         tb_phys_invalidate(tb, addr);
@@ -1029,7 +1005,7 @@ static void tb_invalidate_phys_page(targ
            modifying the memory. It will ensure that it cannot modify
            itself */
         env->current_tb = NULL;
-        tb_gen_code(env, current_pc, current_cs_base, current_flags, 1);
+        env->next_cflags = 1;
         cpu_resume_from_signal(env, puc);
     }
 #endif