tcg-mips: Layout executable and code_gen_buffer

Choosing good addresses for them means we can use JAL for helper calls.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>

diff --git a/configure b/configure
index 605a0ece0c395f391f9f340025dbd8e12f5af53b..4d1e79de3da59886f7f1baede08e7af0dffdb7a1 100755 (executable)
--- a/configure
+++ b/configure
@@ -4029,11 +4029,14 @@ fi
 if test "$pie" = "no" ; then
   textseg_addr=
   case "$cpu" in
-    arm | hppa | i386 | m68k | ppc | ppc64 | s390* | sparc | sparc64 | x86_64 | x32)
+    arm | i386 | ppc* | s390* | sparc* | x86_64 | x32)
+      # ??? Rationale for choosing this address
       textseg_addr=0x60000000
       ;;
     mips)
-      textseg_addr=0x400000
+      # A 256M aligned address, high in the address space, with enough
+      # room for the code_gen_buffer above it before the stack.
+      textseg_addr=0x60000000
       ;;
   esac
   if [ -n "$textseg_addr" ]; then

diff --git a/translate-all.c b/translate-all.c
index 5549a85ed548c6826299d3319196434dfa5fc52a..c631694a6e9ff28e4bc214662a6714acffe6d0dc 100644 (file)
--- a/translate-all.c
+++ b/translate-all.c
@@ -475,6 +475,10 @@ static inline PageDesc *page_find(tb_page_addr_t index)
 #elif defined(__s390x__)
   /* We have a +- 4GB range on the branches; leave some slop.  */
 # define MAX_CODE_GEN_BUFFER_SIZE  (3ul * 1024 * 1024 * 1024)
+#elif defined(__mips__)
+  /* We have a 256MB branch region, but leave room to make sure the
+     main executable is also within that region.  */
+# define MAX_CODE_GEN_BUFFER_SIZE  (128ul * 1024 * 1024)
 #else
 # define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
 #endif
@@ -545,6 +549,15 @@ static inline void *alloc_code_gen_buffer(void)
     start = 0x40000000ul;
 # elif defined(__s390x__)
     start = 0x90000000ul;
+# elif defined(__mips__)
+    /* ??? We ought to more explicitly manage layout for softmmu too.  */
+#  ifdef CONFIG_USER_ONLY
+    start = 0x68000000ul;
+#  elif _MIPS_SIM == _ABI64
+    start = 0x128000000ul;
+#  else
+    start = 0x08000000ul;
+#  endif
 # endif
 
     buf = mmap((void *)start, tcg_ctx.code_gen_buffer_size,