X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fx86-darwin-os.c;h=bdc18543c9633c1196edcaa95667812231c8ebc0;hb=25d55fff07e7eb37ad976f980cb440cdd95ff326;hp=debc8cf6e558192ae01906b269b31b831df61bc5;hpb=2c5a710f4da100f8aa9c7262fa76395f73ee4307;p=sbcl.git

diff --git a/src/runtime/x86-darwin-os.c b/src/runtime/x86-darwin-os.c
index debc8cf..bdc1854 100644
--- a/src/runtime/x86-darwin-os.c
+++ b/src/runtime/x86-darwin-os.c
@@ -273,8 +273,8 @@ void signal_emulation_wrapper(x86_thread_state32_t *thread_state,
     os_invalidate((os_vm_address_t)regs, sizeof(mcontext_t));
 
     /* Trap to restore the signal context. */
-    asm volatile ("movl %0, %%eax; movl %1, %%ebx; .long 0xffff0b0f"
-                  : : "r" (thread_state), "r" (float_state));
+    asm volatile (".long 0xffff0b0f"
+                  : : "a" (thread_state), "c" (float_state));
 }
 
 /* Convenience wrapper for the above */
@@ -478,7 +478,7 @@ catch_exception_raise(mach_port_t exception_port,
                 lose("thread_set_state (x86_THREAD_STATE32) failed %d\n", ret);
             if ((ret = thread_set_state(thread,
                                         x86_FLOAT_STATE32,
-                                        (thread_state_t)thread_state.EBX,
+                                        (thread_state_t)thread_state.ECX,
                                         x86_FLOAT_STATE32_COUNT)) != KERN_SUCCESS)
                 lose("thread_set_state (x86_FLOAT_STATE32) failed %d\n", ret);
             break;
@@ -509,4 +509,16 @@ catch_exception_raise(mach_port_t exception_port,
     return ret;
 }
 
+void
+os_restore_fp_control(os_context_t *context)
+{
+    /* KLUDGE: The x87 FPU control word is some nasty bitfield struct
+     * thing.  Rather than deal with that, just grab it as a 16-bit
+     * integer. */
+    unsigned short fpu_control_word =
+        *((unsigned short *)&context->uc_mcontext->FS.FPU_FCW);
+    /* reset exception flags and restore control flags on x87 FPU */
+    asm ("fldcw %0" : : "m" (fpu_control_word));
+}
+
 #endif