Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20151007' into staging

Do away with TB retranslation

# gpg: Signature made Wed 07 Oct 2015 10:42:08 BST using RSA key ID 4DD0279B
# gpg: Good signature from "Richard Henderson <rth7680@gmail.com>"
# gpg:                 aka "Richard Henderson <rth@redhat.com>"
# gpg:                 aka "Richard Henderson <rth@twiddle.net>"

* remotes/rth/tags/pull-tcg-20151007: (26 commits)
  tcg: Adjust CODE_GEN_AVG_BLOCK_SIZE
  tcg: Check for overflow via highwater mark
  tcg: Allocate a guard page after code_gen_buffer
  tcg: Emit prologue to the beginning of code_gen_buffer
  tcg: Remove tcg_gen_code_search_pc
  tcg: Remove gen_intermediate_code_pc
  tcg: Save insn data and use it in cpu_restore_state_from_tb
  tcg: Pass data argument to restore_state_to_opc
  tcg: Add TCG_MAX_INSNS
  target-*: Drop cpu_gen_code define
  tcg: Merge cpu_gen_code into tb_gen_code
  target-sparc: Add npc state to insn_start
  target-sparc: Remove gen_opc_jump_pc
  target-sparc: Split out gen_branch_n
  target-sparc: Tidy gen_branch_a interface
  target-cris: Mirror gen_opc_pc into insn_start
  target-sh4: Add flags state to insn_start
  target-s390x: Add cc_op state to insn_start
  target-mips: Add delayed branch state to insn_start
  target-i386: Add cc_op state to insn_start
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 21 insertions, 59 deletions

diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 843904b..e4de863 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -42,6 +42,7 @@
 #include "fpu/softfloat.h"
 
 #define NB_MMU_MODES 3
+#define TARGET_INSN_START_EXTRA_WORDS 1
 
 #define MMU_MODE0_SUFFIX _primary
 #define MMU_MODE1_SUFFIX _secondary
@@ -597,7 +598,6 @@ bool css_present(uint8_t cssid);
 
 #define cpu_init(model) CPU(cpu_s390x_init(model))
 #define cpu_exec cpu_s390x_exec
-#define cpu_gen_code cpu_s390x_gen_code
 #define cpu_signal_handler cpu_s390x_signal_handler
 
 void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf);
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index 1151515..05d51fe 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -161,8 +161,6 @@ static char cpu_reg_names[32][4];
 static TCGv_i64 regs[16];
 static TCGv_i64 fregs[16];
 
-static uint8_t gen_opc_cc_op[OPC_BUF_SIZE];
-
 void s390x_translate_init(void)
 {
     int i;
@@ -5319,18 +5317,14 @@ static ExitStatus translate_one(CPUS390XState *env, DisasContext *s)
     return ret;
 }
 
-static inline void gen_intermediate_code_internal(S390CPU *cpu,
-                                                  TranslationBlock *tb,
-                                                  bool search_pc)
+void gen_intermediate_code(CPUS390XState *env, struct TranslationBlock *tb)
 {
+    S390CPU *cpu = s390_env_get_cpu(env);
     CPUState *cs = CPU(cpu);
-    CPUS390XState *env = &cpu->env;
     DisasContext dc;
     target_ulong pc_start;
     uint64_t next_page_start;
-    int j, lj = -1;
     int num_insns, max_insns;
-    CPUBreakpoint *bp;
     ExitStatus status;
     bool do_debug;
 
@@ -5353,41 +5347,27 @@ static inline void gen_intermediate_code_internal(S390CPU *cpu,
     if (max_insns == 0) {
         max_insns = CF_COUNT_MASK;
     }
+    if (max_insns > TCG_MAX_INSNS) {
+        max_insns = TCG_MAX_INSNS;
+    }
 
     gen_tb_start(tb);
 
     do {
-        if (search_pc) {
-            j = tcg_op_buf_count();
-            if (lj < j) {
-                lj++;
-                while (lj < j) {
-                    tcg_ctx.gen_opc_instr_start[lj++] = 0;
-                }
-            }
-            tcg_ctx.gen_opc_pc[lj] = dc.pc;
-            gen_opc_cc_op[lj] = dc.cc_op;
-            tcg_ctx.gen_opc_instr_start[lj] = 1;
-            tcg_ctx.gen_opc_icount[lj] = num_insns;
-        }
-        if (++num_insns == max_insns && (tb->cflags & CF_LAST_IO)) {
-            gen_io_start();
+        tcg_gen_insn_start(dc.pc, dc.cc_op);
+        num_insns++;
+
+        if (unlikely(cpu_breakpoint_test(cs, dc.pc, BP_ANY))) {
+            status = EXIT_PC_STALE;
+            do_debug = true;
+            break;
         }
 
-        if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP | CPU_LOG_TB_OP_OPT))) {
-            tcg_gen_debug_insn_start(dc.pc);
+        if (num_insns == max_insns && (tb->cflags & CF_LAST_IO)) {
+            gen_io_start();
         }
 
         status = NO_EXIT;
-        if (unlikely(!QTAILQ_EMPTY(&cs->breakpoints))) {
-            QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
-                if (bp->pc == dc.pc) {
-                    status = EXIT_PC_STALE;
-                    do_debug = true;
-                    break;
-                }
-            }
-        }
         if (status == NO_EXIT) {
             status = translate_one(env, &dc);
         }
@@ -5432,16 +5412,8 @@ static inline void gen_intermediate_code_internal(S390CPU *cpu,
 
     gen_tb_end(tb, num_insns);
 
-    if (search_pc) {
-        j = tcg_op_buf_count();
-        lj++;
-        while (lj <= j) {
-            tcg_ctx.gen_opc_instr_start[lj++] = 0;
-        }
-    } else {
-        tb->size = dc.pc - pc_start;
-        tb->icount = num_insns;
-    }
+    tb->size = dc.pc - pc_start;
+    tb->icount = num_insns;
 
 #if defined(S390X_DEBUG_DISAS)
     if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
@@ -5452,21 +5424,11 @@ static inline void gen_intermediate_code_internal(S390CPU *cpu,
 #endif
 }
 
-void gen_intermediate_code (CPUS390XState *env, struct TranslationBlock *tb)
-{
-    gen_intermediate_code_internal(s390_env_get_cpu(env), tb, false);
-}
-
-void gen_intermediate_code_pc (CPUS390XState *env, struct TranslationBlock *tb)
-{
-    gen_intermediate_code_internal(s390_env_get_cpu(env), tb, true);
-}
-
-void restore_state_to_opc(CPUS390XState *env, TranslationBlock *tb, int pc_pos)
+void restore_state_to_opc(CPUS390XState *env, TranslationBlock *tb,
+                          target_ulong *data)
 {
-    int cc_op;
-    env->psw.addr = tcg_ctx.gen_opc_pc[pc_pos];
-    cc_op = gen_opc_cc_op[pc_pos];
+    int cc_op = data[1];
+    env->psw.addr = data[0];
     if ((cc_op != CC_OP_DYNAMIC) && (cc_op != CC_OP_STATIC)) {
         env->cc_op = cc_op;
     }