[Qemu-devel] [PATCH 6/6] ARM: linux-user: Restore iWMMXT state from ucontext on sigreturn

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

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/signal.c |   30 ++++++++++++++++++++++++++++++
 1 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 3d0233d..bd0dbc1 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -1602,6 +1602,30 @@ static abi_ulong *restore_sigframe_v2_vfp(CPUState *env, abi_ulong *regspace)
     return (abi_ulong*)(vfpframe + 1);
 }
 
+static abi_ulong *restore_sigframe_v2_iwmmxt(CPUState *env, abi_ulong *regspace)
+{
+    int i;
+    abi_ulong magic, sz;
+    struct target_iwmmxt_sigframe *iwmmxtframe;
+    iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
+
+    __get_user(magic, &iwmmxtframe->magic);
+    __get_user(sz, &iwmmxtframe->size);
+    if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
+        return 0;
+    }
+    for (i = 0; i < 16; i++) {
+        __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
+    }
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
+    return (abi_ulong*)(iwmmxtframe + 1);
+}
+
 static int do_sigframe_return_v2(CPUState *env, target_ulong frame_addr,
                                  struct target_ucontext_v2 *uc)
 {
@@ -1622,6 +1646,12 @@ static int do_sigframe_return_v2(CPUState *env, target_ulong frame_addr,
             return 1;
         }
     }
+    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
+        regspace = restore_sigframe_v2_iwmmxt(env, regspace);
+        if (!regspace) {
+            return 1;
+        }
+    }
 
     if (do_sigaltstack(frame_addr + offsetof(struct target_ucontext_v2, tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
         return 1;
-- 
1.7.1