[PATCH v2 04/23] linux-user/arm: Force v2 frames for fdpic

[Richard Henderson]

The value of get_os_release may be controlled by a command
line option.  Since fdpic was added in v4.14, and v2 frame
were added in v2.6.12, this makes no change under normal conditions.

Cc: qemu-arm@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/arm/signal.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c
index cb65623965..2d30345fc2 100644
--- a/linux-user/arm/signal.c
+++ b/linux-user/arm/signal.c
@@ -167,7 +167,14 @@ static inline int valid_user_regs(CPUARMState *regs)
 
 static bool v2_frame(void)
 {
-    return get_osversion() >= 0x020612;
+    /*
+     * We do not create fdpic trampolines for v1 frames.
+     * Thus we force v2 frames, regardless of what uname says.
+     * Support for fdpic dates from Linux 4.14, so this is not
+     * really a behaviour change.
+     */
+    int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
+    return is_fdpic || get_osversion() >= 0x020612;
 }
 
 static void
-- 
2.25.1