target-lm32: switch to AREG0 free mode

Add an explicit CPUState parameter instead of relying on AREG0
and switch to AREG0 free mode.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

configure

@@ -3874,7 +3874,7 @@ symlink "$source_path/Makefile.target" "$target_dir/Makefile"
 
 
 case "$target_arch2" in
-  alpha | i386 | or32 | s390x | sparc* | x86_64 | xtensa* | ppc*)
+  alpha | i386 | lm32 | or32 | s390x | sparc* | x86_64 | xtensa* | ppc*)
     echo "CONFIG_TCG_PASS_AREG0=y" >> $config_target_mak
   ;;
 esac

target-lm32/Makefile.objs

 obj-y += translate.o op_helper.o helper.o cpu.o
 obj-$(CONFIG_SOFTMMU) += machine.o
-
-$(obj)/op_helper.o: QEMU_CFLAGS += $(HELPER_CFLAGS)

target-lm32/helper.h

 #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)
+DEF_HELPER_2(raise_exception, void, env, i32)
+DEF_HELPER_1(hlt, void, env)
+DEF_HELPER_2(wcsr_im, void, env, i32)
+DEF_HELPER_2(wcsr_ip, void, env, i32)
+DEF_HELPER_2(wcsr_jtx, void, env, i32)
+DEF_HELPER_2(wcsr_jrx, void, env, i32)
+DEF_HELPER_1(rcsr_im, i32, env)
+DEF_HELPER_1(rcsr_ip, i32, env)
+DEF_HELPER_1(rcsr_jtx, i32, env)
+DEF_HELPER_1(rcsr_jrx, i32, env)
 
 #include "def-helper.h"

target-lm32/op_helper.c

 #include <assert.h>
 #include "cpu.h"
-#include "dyngen-exec.h"
 #include "helper.h"
 #include "host-utils.h"
 
@@ -18,55 +17,55 @@
 #define SHIFT 3
 #include "softmmu_template.h"
 
-void helper_raise_exception(uint32_t index)
+void helper_raise_exception(CPULM32State *env, uint32_t index)
 {
     env->exception_index = index;
     cpu_loop_exit(env);
 }
 
-void helper_hlt(void)
+void helper_hlt(CPULM32State *env)
 {
     env->halted = 1;
     env->exception_index = EXCP_HLT;
     cpu_loop_exit(env);
 }
 
-void helper_wcsr_im(uint32_t im)
+void helper_wcsr_im(CPULM32State *env, uint32_t im)
 {
     lm32_pic_set_im(env->pic_state, im);
 }
 
-void helper_wcsr_ip(uint32_t im)
+void helper_wcsr_ip(CPULM32State *env, uint32_t im)
 {
     lm32_pic_set_ip(env->pic_state, im);
 }
 
-void helper_wcsr_jtx(uint32_t jtx)
+void helper_wcsr_jtx(CPULM32State *env, uint32_t jtx)
 {
     lm32_juart_set_jtx(env->juart_state, jtx);
 }
 
-void helper_wcsr_jrx(uint32_t jrx)
+void helper_wcsr_jrx(CPULM32State *env, uint32_t jrx)
 {
     lm32_juart_set_jrx(env->juart_state, jrx);
 }
 
-uint32_t helper_rcsr_im(void)
+uint32_t helper_rcsr_im(CPULM32State *env)
 {
     return lm32_pic_get_im(env->pic_state);
 }
 
-uint32_t helper_rcsr_ip(void)
+uint32_t helper_rcsr_ip(CPULM32State *env)
 {
     return lm32_pic_get_ip(env->pic_state);
 }
 
-uint32_t helper_rcsr_jtx(void)
+uint32_t helper_rcsr_jtx(CPULM32State *env)
 {
     return lm32_juart_get_jtx(env->juart_state);
 }
 
-uint32_t helper_rcsr_jrx(void)
+uint32_t helper_rcsr_jrx(CPULM32State *env)
 {
     return lm32_juart_get_jrx(env->juart_state);
 }
@@ -74,17 +73,12 @@ uint32_t helper_rcsr_jrx(void)
 /* 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(CPULM32State *env1, target_ulong addr, int is_write, int mmu_idx,
+void tlb_fill(CPULM32State *env, target_ulong addr, int is_write, int mmu_idx,
               uintptr_t retaddr)
 {
     TranslationBlock *tb;
-    CPULM32State *saved_env;
     int ret;
 
-    saved_env = env;
-    env = env1;
-
     ret = cpu_lm32_handle_mmu_fault(env, addr, is_write, mmu_idx);
     if (unlikely(ret)) {
         if (retaddr) {
@@ -98,7 +92,6 @@ void tlb_fill(CPULM32State *env1, target_ulong addr, int is_write, int mmu_idx,
         }
         cpu_loop_exit(env);
     }
-    env = saved_env;
 }
 #endif
 

target-lm32/translate.c

@@ -116,7 +116,7 @@ static inline void t_gen_raise_exception(DisasContext *dc, uint32_t index)
 {
     TCGv_i32 tmp = tcg_const_i32(index);
 
-    gen_helper_raise_exception(tmp);
+    gen_helper_raise_exception(cpu_env, tmp);
     tcg_temp_free_i32(tmp);
 }
 
@@ -179,7 +179,7 @@ static void dec_and(DisasContext *dc)
     } else  {
         if (dc->r0 == 0 && dc->r1 == 0 && dc->r2 == 0) {
             tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
-            gen_helper_hlt();
+            gen_helper_hlt(cpu_env);
         } else {
             tcg_gen_and_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
         }
@@ -601,10 +601,10 @@ static void dec_rcsr(DisasContext *dc)
         tcg_gen_mov_tl(cpu_R[dc->r2], cpu_ie);
         break;
     case CSR_IM:
-        gen_helper_rcsr_im(cpu_R[dc->r2]);
+        gen_helper_rcsr_im(cpu_R[dc->r2], cpu_env);
         break;
     case CSR_IP:
-        gen_helper_rcsr_ip(cpu_R[dc->r2]);
+        gen_helper_rcsr_ip(cpu_R[dc->r2], cpu_env);
         break;
     case CSR_CC:
         tcg_gen_mov_tl(cpu_R[dc->r2], cpu_cc);
@@ -622,10 +622,10 @@ static void dec_rcsr(DisasContext *dc)
         tcg_gen_mov_tl(cpu_R[dc->r2], cpu_deba);
         break;
     case CSR_JTX:
-        gen_helper_rcsr_jtx(cpu_R[dc->r2]);
+        gen_helper_rcsr_jtx(cpu_R[dc->r2], cpu_env);
         break;
     case CSR_JRX:
-        gen_helper_rcsr_jrx(cpu_R[dc->r2]);
+        gen_helper_rcsr_jrx(cpu_R[dc->r2], cpu_env);
         break;
     case CSR_ICC:
     case CSR_DCC:
@@ -812,7 +812,7 @@ static void dec_wcsr(DisasContext *dc)
         if (use_icount) {
             gen_io_start();
         }
-        gen_helper_wcsr_im(cpu_R[dc->r1]);
+        gen_helper_wcsr_im(cpu_env, cpu_R[dc->r1]);
         tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
         if (use_icount) {
             gen_io_end();
@@ -824,7 +824,7 @@ static void dec_wcsr(DisasContext *dc)
         if (use_icount) {
             gen_io_start();
         }
-        gen_helper_wcsr_ip(cpu_R[dc->r1]);
+        gen_helper_wcsr_ip(cpu_env, cpu_R[dc->r1]);
         tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
         if (use_icount) {
             gen_io_end();
@@ -844,10 +844,10 @@ static void dec_wcsr(DisasContext *dc)
         tcg_gen_mov_tl(cpu_deba, cpu_R[dc->r1]);
         break;
     case CSR_JTX:
-        gen_helper_wcsr_jtx(cpu_R[dc->r1]);
+        gen_helper_wcsr_jtx(cpu_env, cpu_R[dc->r1]);
         break;
     case CSR_JRX:
-        gen_helper_wcsr_jrx(cpu_R[dc->r1]);
+        gen_helper_wcsr_jrx(cpu_env, cpu_R[dc->r1]);
         break;
     case CSR_DC:
         tcg_gen_mov_tl(cpu_dc, cpu_R[dc->r1]);
@@ -940,15 +940,13 @@ static const DecoderInfo decinfo[] = {
     dec_cmpne
 };
 
-static inline void decode(DisasContext *dc)
+static inline void decode(DisasContext *dc, uint32_t ir)
 {
-    uint32_t ir;
-
     if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP))) {
         tcg_gen_debug_insn_start(dc->pc);
     }
 
-    dc->ir = ir = ldl_code(dc->pc);
+    dc->ir = ir;
     LOG_DIS("%8.8x\t", dc->ir);
 
     /* try guessing 'empty' instruction memory, although it may be a valid
@@ -1068,7 +1066,7 @@ static void gen_intermediate_code_internal(CPULM32State *env,
             gen_io_start();
         }
 
-        decode(dc);
+        decode(dc, cpu_ldl_code(env, dc->pc));
         dc->pc += 4;
         num_insns++;