target/i386: Pass host pointer and size to cpu_x86_{fxsave,fxrstor}

We have already validated the memory region in the course of
validating the signal frame.  No need to do it again within
the helper function.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 23 insertions, 20 deletions

diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c
index dfbb811b56..2e2972002b 100644
--- a/linux-user/i386/signal.c
+++ b/linux-user/i386/signal.c
@@ -294,14 +294,11 @@ static abi_ptr get_sigframe(struct target_sigaction *ka, CPUX86State *env,
  * Set up a signal frame.
  */
 
-static void fxsave_sigcontext(CPUX86State *env, X86LegacyXSaveArea *fxstate,
-                              abi_ptr fxstate_addr)
+static void fxsave_sigcontext(CPUX86State *env, X86LegacyXSaveArea *fxstate)
 {
     struct target_fpx_sw_bytes *sw = (void *)&fxstate->sw_reserved;
 
-    /* fxstate_addr must be 16 byte aligned for fxsave */
-    assert(!(fxstate_addr & 0xf));
-    cpu_x86_fxsave(env, fxstate_addr);
+    cpu_x86_fxsave(env, fxstate, sizeof(*fxstate));
     __put_user(0, &sw->magic1);
 }
 
@@ -412,7 +409,7 @@ static void setup_sigcontext(CPUX86State *env,
         xsave_sigcontext(env, fxstate, fpstate_addr, fxstate_addr, fpend_addr);
         break;
     case FPSTATE_FXSAVE:
-        fxsave_sigcontext(env, fxstate, fxstate_addr);
+        fxsave_sigcontext(env, fxstate);
         break;
     default:
         break;
@@ -669,7 +666,7 @@ static bool xrstor_sigcontext(CPUX86State *env, FPStateKind fpkind,
         break;
     }
 
-    cpu_x86_fxrstor(env, fxstate_addr);
+    cpu_x86_fxrstor(env, fxstate, sizeof(*fxstate));
     return true;
 }
 
@@ -687,7 +684,7 @@ static bool frstor_sigcontext(CPUX86State *env, FPStateKind fpkind,
         }
         break;
     case FPSTATE_FXSAVE:
-        cpu_x86_fxrstor(env, fxstate_addr);
+        cpu_x86_fxrstor(env, fxstate, sizeof(*fxstate));
         break;
     case FPSTATE_FSAVE:
         break;
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index f6020e0b6b..257cd5a617 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -2273,8 +2273,8 @@ int cpu_x86_get_descr_debug(CPUX86State *env, unsigned int selector,
 void cpu_x86_load_seg(CPUX86State *s, X86Seg seg_reg, int selector);
 void cpu_x86_fsave(CPUX86State *s, void *host, size_t len);
 void cpu_x86_frstor(CPUX86State *s, void *host, size_t len);
-void cpu_x86_fxsave(CPUX86State *s, target_ulong ptr);
-void cpu_x86_fxrstor(CPUX86State *s, target_ulong ptr);
+void cpu_x86_fxsave(CPUX86State *s, void *host, size_t len);
+void cpu_x86_fxrstor(CPUX86State *s, void *host, size_t len);
 void cpu_x86_xsave(CPUX86State *s, target_ulong ptr, uint64_t rbfm);
 void cpu_x86_xrstor(CPUX86State *s, target_ulong ptr, uint64_t rbfm);
 
diff --git a/target/i386/tcg/fpu_helper.c b/target/i386/tcg/fpu_helper.c
index 05db16a152..0e5368951f 100644
--- a/target/i386/tcg/fpu_helper.c
+++ b/target/i386/tcg/fpu_helper.c
@@ -3041,22 +3041,28 @@ void cpu_x86_frstor(CPUX86State *env, void *host, size_t len)
     do_frstor(&ac, 0, true);
 }
 
-void cpu_x86_fxsave(CPUX86State *env, target_ulong ptr)
+void cpu_x86_fxsave(CPUX86State *env, void *host, size_t len)
 {
-    X86Access ac;
+    X86Access ac = {
+        .haddr1 = host,
+        .size = sizeof(X86LegacyXSaveArea),
+        .env = env,
+    };
 
-    access_prepare(&ac, env, ptr, sizeof(X86LegacyXSaveArea),
-                   MMU_DATA_STORE, 0);
-    do_fxsave(&ac, ptr);
+    assert(ac.size <= len);
+    do_fxsave(&ac, 0);
 }
 
-void cpu_x86_fxrstor(CPUX86State *env, target_ulong ptr)
+void cpu_x86_fxrstor(CPUX86State *env, void *host, size_t len)
 {
-    X86Access ac;
+    X86Access ac = {
+        .haddr1 = host,
+        .size = sizeof(X86LegacyXSaveArea),
+        .env = env,
+    };
 
-    access_prepare(&ac, env, ptr, sizeof(X86LegacyXSaveArea),
-                   MMU_DATA_LOAD, 0);
-    do_fxrstor(&ac, ptr);
+    assert(ac.size <= len);
+    do_fxrstor(&ac, 0);
 }
 
 void cpu_x86_xsave(CPUX86State *env, target_ulong ptr, uint64_t rfbm)