lm32: translation code helper

This patch adds translation helper functions.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

target-lm32/helper.h

@@ -0,0 +1,14 @@
+#include "def-helper.h"
+
+DEF_HELPER_1(raise_exception, void, i32)
+DEF_HELPER_0(hlt, void)
+DEF_HELPER_1(wcsr_im, void, i32)
+DEF_HELPER_1(wcsr_ip, void, i32)
+DEF_HELPER_1(wcsr_jtx, void, i32)
+DEF_HELPER_1(wcsr_jrx, void, i32)
+DEF_HELPER_0(rcsr_im, i32)
+DEF_HELPER_0(rcsr_ip, i32)
+DEF_HELPER_0(rcsr_jtx, i32)
+DEF_HELPER_0(rcsr_jrx, i32)
+
+#include "def-helper.h"

target-lm32/op_helper.c

@@ -0,0 +1,106 @@
+#include <assert.h>
+#include "exec.h"
+#include "helper.h"
+#include "host-utils.h"
+
+#include "hw/lm32_pic.h"
+#include "hw/lm32_juart.h"
+
+#if !defined(CONFIG_USER_ONLY)
+#define MMUSUFFIX _mmu
+#define SHIFT 0
+#include "softmmu_template.h"
+#define SHIFT 1
+#include "softmmu_template.h"
+#define SHIFT 2
+#include "softmmu_template.h"
+#define SHIFT 3
+#include "softmmu_template.h"
+
+void helper_raise_exception(uint32_t index)
+{
+    env->exception_index = index;
+    cpu_loop_exit();
+}
+
+void helper_hlt(void)
+{
+    env->halted = 1;
+    env->exception_index = EXCP_HLT;
+    cpu_loop_exit();
+}
+
+void helper_wcsr_im(uint32_t im)
+{
+    lm32_pic_set_im(env->pic_state, im);
+}
+
+void helper_wcsr_ip(uint32_t im)
+{
+    lm32_pic_set_ip(env->pic_state, im);
+}
+
+void helper_wcsr_jtx(uint32_t jtx)
+{
+    lm32_juart_set_jtx(env->juart_state, jtx);
+}
+
+void helper_wcsr_jrx(uint32_t jrx)
+{
+    lm32_juart_set_jrx(env->juart_state, jrx);
+}
+
+uint32_t helper_rcsr_im(void)
+{
+    return lm32_pic_get_im(env->pic_state);
+}
+
+uint32_t helper_rcsr_ip(void)
+{
+    return lm32_pic_get_ip(env->pic_state);
+}
+
+uint32_t helper_rcsr_jtx(void)
+{
+    return lm32_juart_get_jtx(env->juart_state);
+}
+
+uint32_t helper_rcsr_jrx(void)
+{
+    return lm32_juart_get_jrx(env->juart_state);
+}
+
+/* Try to fill the TLB and return an exception if error. If retaddr is
+   NULL, it means that the function was called in C code (i.e. not
+   from generated code or from helper.c) */
+/* XXX: fix it to restore all registers */
+void tlb_fill(target_ulong addr, int is_write, int mmu_idx, void *retaddr)
+{
+    TranslationBlock *tb;
+    CPUState *saved_env;
+    unsigned long pc;
+    int ret;
+
+    /* XXX: hack to restore env in all cases, even if not called from
+       generated code */
+    saved_env = env;
+    env = cpu_single_env;
+
+    ret = cpu_lm32_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
+    if (unlikely(ret)) {
+        if (retaddr) {
+            /* now we have a real cpu fault */
+            pc = (unsigned long)retaddr;
+            tb = tb_find_pc(pc);
+            if (tb) {
+                /* the PC is inside the translated code. It means that we have
+                   a virtual CPU fault */
+                cpu_restore_state(tb, env, pc, NULL);
+            }
+        }
+        cpu_loop_exit();
+    }
+    env = saved_env;
+}
+#endif
+