[Qemu-devel] [PATCH v3 08/13] linux-user: Enable NPTL for m68k

[Peter Maydell <peter.maydell@linaro.org>]

For m68k, per-thread data is a purely kernel construct with no
CPU level support. Implement it via a field in the TaskState structure,
used by cpu_set_tls() and the set_thread_area/get_thread_area
syscalls. This allows us to enable compilation with NPTL.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 configure                    |    1 -
 linux-user/m68k/target_cpu.h |    6 +++++-
 linux-user/qemu.h            |    1 +
 linux-user/syscall.c         |   12 ++++++++++++
 4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 117191e..67e6437 100755
--- a/configure
+++ b/configure
@@ -4203,7 +4203,6 @@ case "$target_name" in
   m68k)
     bflt="yes"
     gdb_xml_files="cf-core.xml cf-fp.xml"
-    target_nptl="no"
   ;;
   microblaze|microblazeel)
     TARGET_ARCH=microblaze
diff --git a/linux-user/m68k/target_cpu.h b/linux-user/m68k/target_cpu.h
index 8a2a305..cad9c90 100644
--- a/linux-user/m68k/target_cpu.h
+++ b/linux-user/m68k/target_cpu.h
@@ -29,6 +29,10 @@ static inline void cpu_clone_regs(CPUM68KState *env, target_ulong newsp)
     env->dregs[0] = 0;
 }
 
-/* TODO: need to implement cpu_set_tls() */
+static inline void cpu_set_tls(CPUM68KState *env, target_ulong newtls)
+{
+    TaskState *ts = env->opaque;
+    ts->tp_value = newtls;
+}
 
 #endif
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 8c420da..1ff0fa8 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -121,6 +121,7 @@ typedef struct TaskState {
 #endif
 #ifdef TARGET_M68K
     int sim_syscalls;
+    abi_ulong tp_value;
 #endif
 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
     /* Extra fields for semihosted binaries.  */
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 00a0390..9619656 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8558,6 +8558,12 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #elif defined(TARGET_I386) && defined(TARGET_ABI32)
       ret = do_set_thread_area(cpu_env, arg1);
       break;
+#elif defined(TARGET_M68K)
+      {
+          TaskState *ts = ((CPUArchState *)cpu_env)->opaque;
+          ts->tp_value = arg1;
+          break;
+      }
 #else
       goto unimplemented_nowarn;
 #endif
@@ -8566,6 +8572,12 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_get_thread_area:
 #if defined(TARGET_I386) && defined(TARGET_ABI32)
         ret = do_get_thread_area(cpu_env, arg1);
+#elif defined(TARGET_M68K)
+        {
+            TaskState *ts = ((CPUArchState *)cpu_env)->opaque;
+            ret = ts->tp_value;
+            break;
+        }
 #else
         goto unimplemented_nowarn;
 #endif
-- 
1.7.9.5