From c5be9f0898b92d0d6bfb458fd50fc170f4300361 Mon Sep 17 00:00:00 2001
From: ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Wed, 28 Feb 2007 20:20:53 +0000
Subject: [PATCH] Fix CPU chaining in linux-user emulation, by Gwenole
 Beauchesne.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2459 c046a42c-6fe2-441c-8c8c-71466251a162
---
 cpu-all.h            |  2 ++
 exec.c               | 12 ++++++++++++
 linux-user/syscall.c |  3 +--
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index 8a4730d32c..0ad50e8bf6 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -754,6 +754,8 @@ void page_unprotect_range(target_ulong data, target_ulong data_size);
 
 #endif /* SINGLE_CPU_DEFINES */
 
+CPUState *cpu_copy(CPUState *env);
+
 void cpu_dump_state(CPUState *env, FILE *f, 
                     int (*cpu_fprintf)(FILE *f, const char *fmt, ...),
                     int flags);
diff --git a/exec.c b/exec.c
index 2e09b4bc3e..37d58a43ea 100644
--- a/exec.c
+++ b/exec.c
@@ -1222,6 +1222,18 @@ void cpu_abort(CPUState *env, const char *fmt, ...)
     abort();
 }
 
+CPUState *cpu_copy(CPUState *env)
+{
+    CPUState *new_env = cpu_init();
+    /* preserve chaining and index */
+    CPUState *next_cpu = new_env->next_cpu;
+    int cpu_index = new_env->cpu_index;
+    memcpy(new_env, env, sizeof(CPUState));
+    new_env->next_cpu = next_cpu;
+    new_env->cpu_index = cpu_index;
+    return new_env;
+}
+
 #if !defined(CONFIG_USER_ONLY)
 
 /* NOTE: if flush_global is true, also flush global entries (not
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f3f97b0d57..76b36524a1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1720,8 +1720,7 @@ int do_fork(CPUState *env, unsigned int flags, unsigned long newsp)
         ts->next = first_task_state;
         first_task_state = ts;
         /* we create a new CPU instance. */
-        new_env = cpu_init();
-        memcpy(new_env, env, sizeof(CPUState));
+        new_env = cpu_copy(env);
 #if defined(TARGET_I386)
         if (!newsp)
             newsp = env->regs[R_ESP];