target/nios2: Deprecate the Nios II architecture

[qmiga/qemu.git] / tcg / region.c

diff --git a/tcg/region.c b/tcg/region.c
index bef4c47..8669245 100644 (file)
--- a/tcg/region.c
+++ b/tcg/region.c
@@ -30,11 +30,22 @@
 #include "qemu/cacheinfo.h"
 #include "qemu/qtree.h"
 #include "qapi/error.h"
-#include "exec/exec-all.h"
 #include "tcg/tcg.h"
+#include "exec/translation-block.h"
 #include "tcg-internal.h"
+#include "host/cpuinfo.h"
 
 
+/*
+ * Local source-level compatibility with Unix.
+ * Used by tcg_region_init below.
+ */
+#if defined(_WIN32)
+#define PROT_READ   1
+#define PROT_WRITE  2
+#define PROT_EXEC   4
+#endif
+
 struct tcg_region_tree {
     QemuMutex lock;
     QTree *tree;
@@ -83,6 +94,18 @@ bool in_code_gen_buffer(const void *p)
     return (size_t)(p - region.start_aligned) <= region.total_size;
 }
 
+#ifndef CONFIG_TCG_INTERPRETER
+static int host_prot_read_exec(void)
+{
+#if defined(CONFIG_LINUX) && defined(HOST_AARCH64) && defined(PROT_BTI)
+    if (cpuinfo & CPUINFO_BTI) {
+        return PROT_READ | PROT_EXEC | PROT_BTI;
+    }
+#endif
+    return PROT_READ | PROT_EXEC;
+}
+#endif
+
 #ifdef CONFIG_DEBUG_TCG
 const void *tcg_splitwx_to_rx(void *rw)
 {
@@ -525,7 +548,7 @@ static int alloc_code_gen_buffer(size_t size, int splitwx, Error **errp)
     region.start_aligned = buf;
     region.total_size = size;
 
-    return PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+    return PROT_READ | PROT_WRITE | PROT_EXEC;
 }
 #else
 static int alloc_code_gen_buffer_anon(size_t size, int prot,
@@ -559,7 +582,7 @@ static int alloc_code_gen_buffer_splitwx_memfd(size_t size, Error **errp)
         goto fail;
     }
 
-    buf_rx = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0);
+    buf_rx = mmap(NULL, size, host_prot_read_exec(), MAP_SHARED, fd, 0);
     if (buf_rx == MAP_FAILED) {
         goto fail_rx;
     }
@@ -634,7 +657,7 @@ static int alloc_code_gen_buffer_splitwx_vmremap(size_t size, Error **errp)
         return -1;
     }
 
-    if (mprotect((void *)buf_rx, size, PROT_READ | PROT_EXEC) != 0) {
+    if (mprotect((void *)buf_rx, size, host_prot_read_exec()) != 0) {
         error_setg_errno(errp, errno, "mprotect for jit splitwx");
         munmap((void *)buf_rx, size);
         munmap((void *)buf_rw, size);
@@ -710,7 +733,7 @@ static int alloc_code_gen_buffer(size_t size, int splitwx, Error **errp)
  * and then assigning regions to TCG threads so that the threads can translate
  * code in parallel without synchronization.
  *
- * In softmmu the number of TCG threads is bounded by max_cpus, so we use at
+ * In system-mode the number of TCG threads is bounded by max_cpus, so we use at
  * least max_cpus regions in MTTCG. In !MTTCG we use a single region.
  * Note that the TCG options from the command-line (i.e. -accel accel=tcg,[...])
  * must have been parsed before calling this function, since it calls
@@ -726,7 +749,7 @@ static int alloc_code_gen_buffer(size_t size, int splitwx, Error **errp)
  *
  * However, this user-mode limitation is unlikely to be a significant problem
  * in practice. Multi-threaded guests share most if not all of their translated
- * code, which makes parallel code generation less appealing than in softmmu.
+ * code, which makes parallel code generation less appealing than in system-mode
  */
 void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
 {
@@ -794,10 +817,10 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
      * buffer -- let that one use hugepages throughout.
      * Work with the page protections set up with the initial mapping.
      */
-    need_prot = PAGE_READ | PAGE_WRITE;
+    need_prot = PROT_READ | PROT_WRITE;
 #ifndef CONFIG_TCG_INTERPRETER
     if (tcg_splitwx_diff == 0) {
-        need_prot |= PAGE_EXEC;
+        need_prot |= host_prot_read_exec();
     }
 #endif
     for (size_t i = 0, n = region.n; i < n; i++) {
@@ -807,12 +830,16 @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus)
         if (have_prot != need_prot) {
             int rc;
 
-            if (need_prot == (PAGE_READ | PAGE_WRITE | PAGE_EXEC)) {
+            if (need_prot == (PROT_READ | PROT_WRITE | PROT_EXEC)) {
                 rc = qemu_mprotect_rwx(start, end - start);
-            } else if (need_prot == (PAGE_READ | PAGE_WRITE)) {
+            } else if (need_prot == (PROT_READ | PROT_WRITE)) {
                 rc = qemu_mprotect_rw(start, end - start);
             } else {
+#ifdef CONFIG_POSIX
+                rc = mprotect(start, end - start, need_prot);
+#else
                 g_assert_not_reached();
+#endif
             }
             if (rc) {
                 error_setg_errno(&error_fatal, errno,