tcg: define tcg_init_ctx and make tcg_ctx a pointer

Groundwork for supporting multiple TCG contexts.

The core of this patch is this change to tcg/tcg.h:

> -extern TCGContext tcg_ctx;
> +extern TCGContext tcg_init_ctx;
> +extern TCGContext *tcg_ctx;

Note that for now we set *tcg_ctx to whatever TCGContext is passed
to tcg_context_init -- in this case &tcg_init_ctx.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/tcg-runtime.c

@@ -153,7 +153,7 @@ void *HELPER(lookup_tb_ptr)(CPUArchState *env)
 
     tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, curr_cflags());
     if (tb == NULL) {
-        return tcg_ctx.code_gen_epilogue;
+        return tcg_ctx->code_gen_epilogue;
     }
     qemu_log_mask_and_addr(CPU_LOG_EXEC, pc,
                            "Chain %p [%d: " TARGET_FMT_lx "] %s\n",

accel/tcg/translate-all.c

@@ -153,7 +153,8 @@ static int v_l2_levels;
 static void *l1_map[V_L1_MAX_SIZE];
 
 /* code generation context */
-TCGContext tcg_ctx;
+TCGContext tcg_init_ctx;
+TCGContext *tcg_ctx;
 TBContext tb_ctx;
 bool parallel_cpus;
 
@@ -209,7 +210,7 @@ static TranslationBlock *tb_find_pc(uintptr_t tc_ptr);
 
 void cpu_gen_init(void)
 {
-    tcg_context_init(&tcg_ctx); 
+    tcg_context_init(&tcg_init_ctx);
 }
 
 /* Encode VAL as a signed leb128 sequence at P.
@@ -267,7 +268,7 @@ static target_long decode_sleb128(uint8_t **pp)
 
 static int encode_search(TranslationBlock *tb, uint8_t *block)
 {
-    uint8_t *highwater = tcg_ctx.code_gen_highwater;
+    uint8_t *highwater = tcg_ctx->code_gen_highwater;
     uint8_t *p = block;
     int i, j, n;
 
@@ -278,12 +279,12 @@ static int encode_search(TranslationBlock *tb, uint8_t *block)
             if (i == 0) {
                 prev = (j == 0 ? tb->pc : 0);
             } else {
-                prev = tcg_ctx.gen_insn_data[i - 1][j];
+                prev = tcg_ctx->gen_insn_data[i - 1][j];
             }
-            p = encode_sleb128(p, tcg_ctx.gen_insn_data[i][j] - prev);
+            p = encode_sleb128(p, tcg_ctx->gen_insn_data[i][j] - prev);
         }
-        prev = (i == 0 ? 0 : tcg_ctx.gen_insn_end_off[i - 1]);
-        p = encode_sleb128(p, tcg_ctx.gen_insn_end_off[i] - prev);
+        prev = (i == 0 ? 0 : tcg_ctx->gen_insn_end_off[i - 1]);
+        p = encode_sleb128(p, tcg_ctx->gen_insn_end_off[i] - prev);
 
         /* Test for (pending) buffer overflow.  The assumption is that any
            one row beginning below the high water mark cannot overrun
@@ -343,8 +344,8 @@ static int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb,
     restore_state_to_opc(env, tb, data);
 
 #ifdef CONFIG_PROFILER
-    tcg_ctx.restore_time += profile_getclock() - ti;
-    tcg_ctx.restore_count++;
+    tcg_ctx->restore_time += profile_getclock() - ti;
+    tcg_ctx->restore_count++;
 #endif
     return 0;
 }
@@ -590,7 +591,7 @@ static inline void *split_cross_256mb(void *buf1, size_t size1)
         buf1 = buf2;
     }
 
-    tcg_ctx.code_gen_buffer_size = size1;
+    tcg_ctx->code_gen_buffer_size = size1;
     return buf1;
 }
 #endif
@@ -653,16 +654,16 @@ static inline void *alloc_code_gen_buffer(void)
     size = full_size - qemu_real_host_page_size;
 
     /* Honor a command-line option limiting the size of the buffer.  */
-    if (size > tcg_ctx.code_gen_buffer_size) {
-        size = (((uintptr_t)buf + tcg_ctx.code_gen_buffer_size)
+    if (size > tcg_ctx->code_gen_buffer_size) {
+        size = (((uintptr_t)buf + tcg_ctx->code_gen_buffer_size)
                 & qemu_real_host_page_mask) - (uintptr_t)buf;
     }
-    tcg_ctx.code_gen_buffer_size = size;
+    tcg_ctx->code_gen_buffer_size = size;
 
 #ifdef __mips__
     if (cross_256mb(buf, size)) {
         buf = split_cross_256mb(buf, size);
-        size = tcg_ctx.code_gen_buffer_size;
+        size = tcg_ctx->code_gen_buffer_size;
     }
 #endif
 
@@ -675,7 +676,7 @@ static inline void *alloc_code_gen_buffer(void)
 #elif defined(_WIN32)
 static inline void *alloc_code_gen_buffer(void)
 {
-    size_t size = tcg_ctx.code_gen_buffer_size;
+    size_t size = tcg_ctx->code_gen_buffer_size;
     void *buf1, *buf2;
 
     /* Perform the allocation in two steps, so that the guard page
@@ -694,7 +695,7 @@ static inline void *alloc_code_gen_buffer(void)
 {
     int flags = MAP_PRIVATE | MAP_ANONYMOUS;
     uintptr_t start = 0;
-    size_t size = tcg_ctx.code_gen_buffer_size;
+    size_t size = tcg_ctx->code_gen_buffer_size;
     void *buf;
 
     /* Constrain the position of the buffer based on the host cpu.
@@ -711,7 +712,7 @@ static inline void *alloc_code_gen_buffer(void)
     flags |= MAP_32BIT;
     /* Cannot expect to map more than 800MB in low memory.  */
     if (size > 800u * 1024 * 1024) {
-        tcg_ctx.code_gen_buffer_size = size = 800u * 1024 * 1024;
+        tcg_ctx->code_gen_buffer_size = size = 800u * 1024 * 1024;
     }
 # elif defined(__sparc__)
     start = 0x40000000ul;
@@ -751,7 +752,7 @@ static inline void *alloc_code_gen_buffer(void)
         default:
             /* Split the original buffer.  Free the smaller half.  */
             buf2 = split_cross_256mb(buf, size);
-            size2 = tcg_ctx.code_gen_buffer_size;
+            size2 = tcg_ctx->code_gen_buffer_size;
             if (buf == buf2) {
                 munmap(buf + size2 + qemu_real_host_page_size, size - size2);
             } else {
@@ -819,9 +820,9 @@ static gint tb_tc_cmp(gconstpointer ap, gconstpointer bp)
 
 static inline void code_gen_alloc(size_t tb_size)
 {
-    tcg_ctx.code_gen_buffer_size = size_code_gen_buffer(tb_size);
-    tcg_ctx.code_gen_buffer = alloc_code_gen_buffer();
-    if (tcg_ctx.code_gen_buffer == NULL) {
+    tcg_ctx->code_gen_buffer_size = size_code_gen_buffer(tb_size);
+    tcg_ctx->code_gen_buffer = alloc_code_gen_buffer();
+    if (tcg_ctx->code_gen_buffer == NULL) {
         fprintf(stderr, "Could not allocate dynamic translator buffer\n");
         exit(1);
     }
@@ -849,7 +850,7 @@ void tcg_exec_init(unsigned long tb_size)
 #if defined(CONFIG_SOFTMMU)
     /* There's no guest base to take into account, so go ahead and
        initialize the prologue now.  */
-    tcg_prologue_init(&tcg_ctx);
+    tcg_prologue_init(tcg_ctx);
 #endif
 }
 
@@ -865,7 +866,7 @@ static TranslationBlock *tb_alloc(target_ulong pc)
 
     assert_tb_locked();
 
-    tb = tcg_tb_alloc(&tcg_ctx);
+    tb = tcg_tb_alloc(tcg_ctx);
     if (unlikely(tb == NULL)) {
         return NULL;
     }
@@ -949,11 +950,11 @@ static void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
 
         g_tree_foreach(tb_ctx.tb_tree, tb_host_size_iter, &host_size);
         printf("qemu: flush code_size=%td nb_tbs=%zu avg_tb_size=%zu\n",
-               tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer, nb_tbs,
+               tcg_ctx->code_gen_ptr - tcg_ctx->code_gen_buffer, nb_tbs,
                nb_tbs > 0 ? host_size / nb_tbs : 0);
     }
-    if ((unsigned long)(tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer)
-        > tcg_ctx.code_gen_buffer_size) {
+    if ((unsigned long)(tcg_ctx->code_gen_ptr - tcg_ctx->code_gen_buffer)
+        > tcg_ctx->code_gen_buffer_size) {
         cpu_abort(cpu, "Internal error: code buffer overflow\n");
     }
 
@@ -968,7 +969,7 @@ static void do_tb_flush(CPUState *cpu, run_on_cpu_data tb_flush_count)
     qht_reset_size(&tb_ctx.htable, CODE_GEN_HTABLE_SIZE);
     page_flush_tb();
 
-    tcg_ctx.code_gen_ptr = tcg_ctx.code_gen_buffer;
+    tcg_ctx->code_gen_ptr = tcg_ctx->code_gen_buffer;
     /* XXX: flush processor icache at this point if cache flush is
        expensive */
     atomic_mb_set(&tb_ctx.tb_flush_count, tb_ctx.tb_flush_count + 1);
@@ -1316,44 +1317,44 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
         cpu_loop_exit(cpu);
     }
 
-    gen_code_buf = tcg_ctx.code_gen_ptr;
+    gen_code_buf = tcg_ctx->code_gen_ptr;
     tb->tc.ptr = gen_code_buf;
     tb->pc = pc;
     tb->cs_base = cs_base;
     tb->flags = flags;
     tb->cflags = cflags;
     tb->trace_vcpu_dstate = *cpu->trace_dstate;
-    tcg_ctx.tb_cflags = cflags;
+    tcg_ctx->tb_cflags = cflags;
 
 #ifdef CONFIG_PROFILER
-    tcg_ctx.tb_count1++; /* includes aborted translations because of
+    tcg_ctx->tb_count1++; /* includes aborted translations because of
                        exceptions */
     ti = profile_getclock();
 #endif
 
-    tcg_func_start(&tcg_ctx);
+    tcg_func_start(tcg_ctx);
 
-    tcg_ctx.cpu = ENV_GET_CPU(env);
+    tcg_ctx->cpu = ENV_GET_CPU(env);
     gen_intermediate_code(cpu, tb);
-    tcg_ctx.cpu = NULL;
+    tcg_ctx->cpu = NULL;
 
     trace_translate_block(tb, tb->pc, tb->tc.ptr);
 
     /* generate machine code */
     tb->jmp_reset_offset[0] = TB_JMP_RESET_OFFSET_INVALID;
     tb->jmp_reset_offset[1] = TB_JMP_RESET_OFFSET_INVALID;
-    tcg_ctx.tb_jmp_reset_offset = tb->jmp_reset_offset;
+    tcg_ctx->tb_jmp_reset_offset = tb->jmp_reset_offset;
     if (TCG_TARGET_HAS_direct_jump) {
-        tcg_ctx.tb_jmp_insn_offset = tb->jmp_target_arg;
-        tcg_ctx.tb_jmp_target_addr = NULL;
+        tcg_ctx->tb_jmp_insn_offset = tb->jmp_target_arg;
+        tcg_ctx->tb_jmp_target_addr = NULL;
     } else {
-        tcg_ctx.tb_jmp_insn_offset = NULL;
-        tcg_ctx.tb_jmp_target_addr = tb->jmp_target_arg;
+        tcg_ctx->tb_jmp_insn_offset = NULL;
+        tcg_ctx->tb_jmp_target_addr = tb->jmp_target_arg;
     }
 
 #ifdef CONFIG_PROFILER
-    tcg_ctx.tb_count++;
-    tcg_ctx.interm_time += profile_getclock() - ti;
+    tcg_ctx->tb_count++;
+    tcg_ctx->interm_time += profile_getclock() - ti;
     ti = profile_getclock();
 #endif
 
@@ -1362,7 +1363,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
        the tcg optimization currently hidden inside tcg_gen_code.  All
        that should be required is to flush the TBs, allocate a new TB,
        re-initialize it per above, and re-do the actual code generation.  */
-    gen_code_size = tcg_gen_code(&tcg_ctx, tb);
+    gen_code_size = tcg_gen_code(tcg_ctx, tb);
     if (unlikely(gen_code_size < 0)) {
         goto buffer_overflow;
     }
@@ -1373,10 +1374,10 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
     tb->tc.size = gen_code_size;
 
 #ifdef CONFIG_PROFILER
-    tcg_ctx.code_time += profile_getclock() - ti;
-    tcg_ctx.code_in_len += tb->size;
-    tcg_ctx.code_out_len += gen_code_size;
-    tcg_ctx.search_out_len += search_size;
+    tcg_ctx->code_time += profile_getclock() - ti;
+    tcg_ctx->code_in_len += tb->size;
+    tcg_ctx->code_out_len += gen_code_size;
+    tcg_ctx->search_out_len += search_size;
 #endif
 
 #ifdef DEBUG_DISAS
@@ -1384,8 +1385,8 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
         qemu_log_in_addr_range(tb->pc)) {
         qemu_log_lock();
         qemu_log("OUT: [size=%d]\n", gen_code_size);
-        if (tcg_ctx.data_gen_ptr) {
-            size_t code_size = tcg_ctx.data_gen_ptr - tb->tc.ptr;
+        if (tcg_ctx->data_gen_ptr) {
+            size_t code_size = tcg_ctx->data_gen_ptr - tb->tc.ptr;
             size_t data_size = gen_code_size - code_size;
             size_t i;
 
@@ -1394,12 +1395,12 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
             for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
                 if (sizeof(tcg_target_ulong) == 8) {
                     qemu_log("0x%08" PRIxPTR ":  .quad  0x%016" PRIx64 "\n",
-                             (uintptr_t)tcg_ctx.data_gen_ptr + i,
-                             *(uint64_t *)(tcg_ctx.data_gen_ptr + i));
+                             (uintptr_t)tcg_ctx->data_gen_ptr + i,
+                             *(uint64_t *)(tcg_ctx->data_gen_ptr + i));
                 } else {
                     qemu_log("0x%08" PRIxPTR ":  .long  0x%08x\n",
-                             (uintptr_t)tcg_ctx.data_gen_ptr + i,
-                             *(uint32_t *)(tcg_ctx.data_gen_ptr + i));
+                             (uintptr_t)tcg_ctx->data_gen_ptr + i,
+                             *(uint32_t *)(tcg_ctx->data_gen_ptr + i));
                 }
             }
         } else {
@@ -1411,7 +1412,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
     }
 #endif
 
-    tcg_ctx.code_gen_ptr = (void *)
+    tcg_ctx->code_gen_ptr = (void *)
         ROUND_UP((uintptr_t)gen_code_buf + gen_code_size + search_size,
                  CODE_GEN_ALIGN);
 
@@ -1940,8 +1941,8 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf)
      * For avg host size we use the precise numbers from tb_tree_stats though.
      */
     cpu_fprintf(f, "gen code size       %td/%zd\n",
-                tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer,
-                tcg_ctx.code_gen_highwater - tcg_ctx.code_gen_buffer);
+                tcg_ctx->code_gen_ptr - tcg_ctx->code_gen_buffer,
+                tcg_ctx->code_gen_highwater - tcg_ctx->code_gen_buffer);
     cpu_fprintf(f, "TB count            %zu\n", nb_tbs);
     cpu_fprintf(f, "TB avg target size  %zu max=%zu bytes\n",
                 nb_tbs ? tst.target_size / nb_tbs : 0,

bsd-user/main.c

@@ -977,7 +977,7 @@ int main(int argc, char **argv)
     /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
        generating the prologue until now so that the prologue can take
        the real value of GUEST_BASE into account.  */
-    tcg_prologue_init(&tcg_ctx);
+    tcg_prologue_init(tcg_ctx);
 
     /* build Task State */
     memset(ts, 0, sizeof(TaskState));

include/exec/gen-icount.h

@@ -19,7 +19,7 @@ static inline void gen_tb_start(TranslationBlock *tb)
         count = tcg_temp_new_i32();
     }
 
-    tcg_gen_ld_i32(count, tcg_ctx.tcg_env,
+    tcg_gen_ld_i32(count, tcg_ctx->tcg_env,
                    -ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
 
     if (tb_cflags(tb) & CF_USE_ICOUNT) {
@@ -37,7 +37,7 @@ static inline void gen_tb_start(TranslationBlock *tb)
     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, exitreq_label);
 
     if (tb_cflags(tb) & CF_USE_ICOUNT) {
-        tcg_gen_st16_i32(count, tcg_ctx.tcg_env,
+        tcg_gen_st16_i32(count, tcg_ctx->tcg_env,
                          -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
     }
 
@@ -56,13 +56,13 @@ static inline void gen_tb_end(TranslationBlock *tb, int num_insns)
     tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
 
     /* Terminate the linked list.  */
-    tcg_ctx.gen_op_buf[tcg_ctx.gen_op_buf[0].prev].next = 0;
+    tcg_ctx->gen_op_buf[tcg_ctx->gen_op_buf[0].prev].next = 0;
 }
 
 static inline void gen_io_start(void)
 {
     TCGv_i32 tmp = tcg_const_i32(1);
-    tcg_gen_st_i32(tmp, tcg_ctx.tcg_env,
+    tcg_gen_st_i32(tmp, tcg_ctx->tcg_env,
                    -ENV_OFFSET + offsetof(CPUState, can_do_io));
     tcg_temp_free_i32(tmp);
 }
@@ -70,7 +70,7 @@ static inline void gen_io_start(void)
 static inline void gen_io_end(void)
 {
     TCGv_i32 tmp = tcg_const_i32(0);
-    tcg_gen_st_i32(tmp, tcg_ctx.tcg_env,
+    tcg_gen_st_i32(tmp, tcg_ctx->tcg_env,
                    -ENV_OFFSET + offsetof(CPUState, can_do_io));
     tcg_temp_free_i32(tmp);
 }

linux-user/main.c

@@ -4476,7 +4476,7 @@ int main(int argc, char **argv, char **envp)
     /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
        generating the prologue until now so that the prologue can take
        the real value of GUEST_BASE into account.  */
-    tcg_prologue_init(&tcg_ctx);
+    tcg_prologue_init(tcg_ctx);
 
 #if defined(TARGET_I386)
     env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;

target/alpha/translate.c

@@ -127,7 +127,7 @@ void alpha_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < 31; i++) {
         cpu_std_ir[i] = tcg_global_mem_new_i64(cpu_env,

target/arm/translate.c

@@ -82,7 +82,7 @@ void arm_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < 16; i++) {
         cpu_R[i] = tcg_global_mem_new_i32(cpu_env,

target/cris/translate.c

@@ -3369,7 +3369,7 @@ void cris_initialize_tcg(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cc_x = tcg_global_mem_new(cpu_env,
                               offsetof(CPUCRISState, cc_x), "cc_x");
     cc_src = tcg_global_mem_new(cpu_env,

target/cris/translate_v10.c

@@ -1273,7 +1273,7 @@ void cris_initialize_crisv10_tcg(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cc_x = tcg_global_mem_new(cpu_env,
                               offsetof(CPUCRISState, cc_x), "cc_x");
     cc_src = tcg_global_mem_new(cpu_env,

target/hppa/translate.c

@@ -127,7 +127,7 @@ void hppa_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     TCGV_UNUSED(cpu_gr[0]);
     for (i = 1; i < 32; i++) {

target/i386/translate.c

@@ -8368,7 +8368,7 @@ void tcg_x86_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cpu_cc_op = tcg_global_mem_new_i32(cpu_env,
                                        offsetof(CPUX86State, cc_op), "cc_op");
     cpu_cc_dst = tcg_global_mem_new(cpu_env, offsetof(CPUX86State, cc_dst),

target/lm32/translate.c

@@ -1209,7 +1209,7 @@ void lm32_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < ARRAY_SIZE(cpu_R); i++) {
         cpu_R[i] = tcg_global_mem_new(cpu_env,

target/m68k/translate.c

@@ -70,7 +70,7 @@ void m68k_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
 #define DEFO32(name, offset) \
     QREG_##name = tcg_global_mem_new_i32(cpu_env, \

target/microblaze/translate.c

@@ -1856,7 +1856,7 @@ void mb_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     env_debug = tcg_global_mem_new(cpu_env,
                     offsetof(CPUMBState, debug),

target/mips/translate.c

@@ -20455,7 +20455,7 @@ void mips_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     TCGV_UNUSED(cpu_gpr[0]);
     for (i = 1; i < 32; i++)

target/moxie/translate.c

@@ -102,7 +102,7 @@ void moxie_translate_init(void)
     };
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cpu_pc = tcg_global_mem_new_i32(cpu_env,
                                     offsetof(CPUMoxieState, pc), "$pc");
     for (i = 0; i < 16; i++)

target/nios2/translate.c

@@ -948,7 +948,7 @@ void nios2_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < NUM_CORE_REGS; i++) {
         cpu_R[i] = tcg_global_mem_new(cpu_env,

target/openrisc/translate.c

@@ -81,7 +81,7 @@ void openrisc_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cpu_sr = tcg_global_mem_new(cpu_env,
                                 offsetof(CPUOpenRISCState, sr), "sr");
     cpu_dflag = tcg_global_mem_new_i32(cpu_env,

target/ppc/translate.c

@@ -86,7 +86,7 @@ void ppc_translate_init(void)
     size_t cpu_reg_names_size;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     p = cpu_reg_names;
     cpu_reg_names_size = sizeof(cpu_reg_names);

target/s390x/translate.c

@@ -113,7 +113,7 @@ void s390x_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     psw_addr = tcg_global_mem_new_i64(cpu_env,
                                       offsetof(CPUS390XState, psw.addr),
                                       "psw_addr");

target/sh4/translate.c

@@ -100,7 +100,7 @@ void sh4_translate_init(void)
     };
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < 24; i++) {
         cpu_gregs[i] = tcg_global_mem_new_i32(cpu_env,

target/sparc/translate.c

@@ -5912,7 +5912,7 @@ void sparc_tcg_init(void)
     unsigned int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     cpu_regwptr = tcg_global_mem_new_ptr(cpu_env,
                                          offsetof(CPUSPARCState, regwptr),

target/tilegx/translate.c

@@ -2446,7 +2446,7 @@ void tilegx_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cpu_pc = tcg_global_mem_new_i64(cpu_env, offsetof(CPUTLGState, pc), "pc");
     for (i = 0; i < TILEGX_R_COUNT; i++) {
         cpu_regs[i] = tcg_global_mem_new_i64(cpu_env,

target/tricore/translate.c

@@ -8882,7 +8882,7 @@ void tricore_tcg_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     /* reg init */
     for (i = 0 ; i < 16 ; i++) {
         cpu_gpr_a[i] = tcg_global_mem_new(cpu_env,

target/unicore32/translate.c

@@ -75,7 +75,7 @@ void uc32_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
 
     for (i = 0; i < 32; i++) {
         cpu_R[i] = tcg_global_mem_new_i32(cpu_env,

target/xtensa/translate.c

@@ -222,7 +222,7 @@ void xtensa_translate_init(void)
     int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
-    tcg_ctx.tcg_env = cpu_env;
+    tcg_ctx->tcg_env = cpu_env;
     cpu_pc = tcg_global_mem_new_i32(cpu_env,
             offsetof(CPUXtensaState, pc), "pc");
 

tcg/tcg-op.c

@@ -48,7 +48,7 @@ extern TCGv_i32 TCGV_HIGH_link_error(TCGv_i64);
 
 static inline TCGOp *tcg_emit_op(TCGOpcode opc)
 {
-    TCGContext *ctx = &tcg_ctx;
+    TCGContext *ctx = tcg_ctx;
     int oi = ctx->gen_next_op_idx;
     int ni = oi + 1;
     int pi = oi - 1;
@@ -121,7 +121,7 @@ void tcg_gen_op6(TCGOpcode opc, TCGArg a1, TCGArg a2, TCGArg a3,
 
 void tcg_gen_mb(TCGBar mb_type)
 {
-    if (tcg_ctx.tb_cflags & CF_PARALLEL) {
+    if (tcg_ctx->tb_cflags & CF_PARALLEL) {
         tcg_gen_op1(INDEX_op_mb, mb_type);
     }
 }
@@ -2552,8 +2552,8 @@ void tcg_gen_goto_tb(unsigned idx)
     tcg_debug_assert(idx <= 1);
 #ifdef CONFIG_DEBUG_TCG
     /* Verify that we havn't seen this numbered exit before.  */
-    tcg_debug_assert((tcg_ctx.goto_tb_issue_mask & (1 << idx)) == 0);
-    tcg_ctx.goto_tb_issue_mask |= 1 << idx;
+    tcg_debug_assert((tcg_ctx->goto_tb_issue_mask & (1 << idx)) == 0);
+    tcg_ctx->goto_tb_issue_mask |= 1 << idx;
 #endif
     tcg_gen_op1i(INDEX_op_goto_tb, idx);
 }
@@ -2562,7 +2562,7 @@ void tcg_gen_lookup_and_goto_ptr(void)
 {
     if (TCG_TARGET_HAS_goto_ptr && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
         TCGv_ptr ptr = tcg_temp_new_ptr();
-        gen_helper_lookup_tb_ptr(ptr, tcg_ctx.tcg_env);
+        gen_helper_lookup_tb_ptr(ptr, tcg_ctx->tcg_env);
         tcg_gen_op1i(INDEX_op_goto_ptr, tcgv_ptr_arg(ptr));
         tcg_temp_free_ptr(ptr);
     } else {
@@ -2648,7 +2648,7 @@ void tcg_gen_qemu_ld_i32(TCGv_i32 val, TCGv addr, TCGArg idx, TCGMemOp memop)
 {
     tcg_gen_req_mo(TCG_MO_LD_LD | TCG_MO_ST_LD);
     memop = tcg_canonicalize_memop(memop, 0, 0);
-    trace_guest_mem_before_tcg(tcg_ctx.cpu, tcg_ctx.tcg_env,
+    trace_guest_mem_before_tcg(tcg_ctx->cpu, tcg_ctx->tcg_env,
                                addr, trace_mem_get_info(memop, 0));
     gen_ldst_i32(INDEX_op_qemu_ld_i32, val, addr, memop, idx);
 }
@@ -2657,7 +2657,7 @@ void tcg_gen_qemu_st_i32(TCGv_i32 val, TCGv addr, TCGArg idx, TCGMemOp memop)
 {
     tcg_gen_req_mo(TCG_MO_LD_ST | TCG_MO_ST_ST);
     memop = tcg_canonicalize_memop(memop, 0, 1);
-    trace_guest_mem_before_tcg(tcg_ctx.cpu, tcg_ctx.tcg_env,
+    trace_guest_mem_before_tcg(tcg_ctx->cpu, tcg_ctx->tcg_env,
                                addr, trace_mem_get_info(memop, 1));
     gen_ldst_i32(INDEX_op_qemu_st_i32, val, addr, memop, idx);
 }
@@ -2676,7 +2676,7 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, TCGMemOp memop)
     }
 
     memop = tcg_canonicalize_memop(memop, 1, 0);
-    trace_guest_mem_before_tcg(tcg_ctx.cpu, tcg_ctx.tcg_env,
+    trace_guest_mem_before_tcg(tcg_ctx->cpu, tcg_ctx->tcg_env,
                                addr, trace_mem_get_info(memop, 0));
     gen_ldst_i64(INDEX_op_qemu_ld_i64, val, addr, memop, idx);
 }
@@ -2690,7 +2690,7 @@ void tcg_gen_qemu_st_i64(TCGv_i64 val, TCGv addr, TCGArg idx, TCGMemOp memop)
     }
 
     memop = tcg_canonicalize_memop(memop, 1, 1);
-    trace_guest_mem_before_tcg(tcg_ctx.cpu, tcg_ctx.tcg_env,
+    trace_guest_mem_before_tcg(tcg_ctx->cpu, tcg_ctx->tcg_env,
                                addr, trace_mem_get_info(memop, 1));
     gen_ldst_i64(INDEX_op_qemu_st_i64, val, addr, memop, idx);
 }
@@ -2780,7 +2780,7 @@ void tcg_gen_atomic_cmpxchg_i32(TCGv_i32 retv, TCGv addr, TCGv_i32 cmpv,
 {
     memop = tcg_canonicalize_memop(memop, 0, 0);
 
-    if (!(tcg_ctx.tb_cflags & CF_PARALLEL)) {
+    if (!(tcg_ctx->tb_cflags & CF_PARALLEL)) {
         TCGv_i32 t1 = tcg_temp_new_i32();
         TCGv_i32 t2 = tcg_temp_new_i32();
 
@@ -2806,11 +2806,11 @@ void tcg_gen_atomic_cmpxchg_i32(TCGv_i32 retv, TCGv addr, TCGv_i32 cmpv,
 #ifdef CONFIG_SOFTMMU
         {
             TCGv_i32 oi = tcg_const_i32(make_memop_idx(memop & ~MO_SIGN, idx));
-            gen(retv, tcg_ctx.tcg_env, addr, cmpv, newv, oi);
+            gen(retv, tcg_ctx->tcg_env, addr, cmpv, newv, oi);
             tcg_temp_free_i32(oi);
         }
 #else
-        gen(retv, tcg_ctx.tcg_env, addr, cmpv, newv);
+        gen(retv, tcg_ctx->tcg_env, addr, cmpv, newv);
 #endif
 
         if (memop & MO_SIGN) {
@@ -2824,7 +2824,7 @@ void tcg_gen_atomic_cmpxchg_i64(TCGv_i64 retv, TCGv addr, TCGv_i64 cmpv,
 {
     memop = tcg_canonicalize_memop(memop, 1, 0);
 
-    if (!(tcg_ctx.tb_cflags & CF_PARALLEL)) {
+    if (!(tcg_ctx->tb_cflags & CF_PARALLEL)) {
         TCGv_i64 t1 = tcg_temp_new_i64();
         TCGv_i64 t2 = tcg_temp_new_i64();
 
@@ -2851,14 +2851,14 @@ void tcg_gen_atomic_cmpxchg_i64(TCGv_i64 retv, TCGv addr, TCGv_i64 cmpv,
 #ifdef CONFIG_SOFTMMU
         {
             TCGv_i32 oi = tcg_const_i32(make_memop_idx(memop, idx));
-            gen(retv, tcg_ctx.tcg_env, addr, cmpv, newv, oi);
+            gen(retv, tcg_ctx->tcg_env, addr, cmpv, newv, oi);
             tcg_temp_free_i32(oi);
         }
 #else
-        gen(retv, tcg_ctx.tcg_env, addr, cmpv, newv);
+        gen(retv, tcg_ctx->tcg_env, addr, cmpv, newv);
 #endif
 #else
-        gen_helper_exit_atomic(tcg_ctx.tcg_env);
+        gen_helper_exit_atomic(tcg_ctx->tcg_env);
         /* Produce a result, so that we have a well-formed opcode stream
            with respect to uses of the result in the (dead) code following.  */
         tcg_gen_movi_i64(retv, 0);
@@ -2914,11 +2914,11 @@ static void do_atomic_op_i32(TCGv_i32 ret, TCGv addr, TCGv_i32 val,
 #ifdef CONFIG_SOFTMMU
     {
         TCGv_i32 oi = tcg_const_i32(make_memop_idx(memop & ~MO_SIGN, idx));
-        gen(ret, tcg_ctx.tcg_env, addr, val, oi);
+        gen(ret, tcg_ctx->tcg_env, addr, val, oi);
         tcg_temp_free_i32(oi);
     }
 #else
-    gen(ret, tcg_ctx.tcg_env, addr, val);
+    gen(ret, tcg_ctx->tcg_env, addr, val);
 #endif
 
     if (memop & MO_SIGN) {
@@ -2959,14 +2959,14 @@ static void do_atomic_op_i64(TCGv_i64 ret, TCGv addr, TCGv_i64 val,
 #ifdef CONFIG_SOFTMMU
         {
             TCGv_i32 oi = tcg_const_i32(make_memop_idx(memop & ~MO_SIGN, idx));
-            gen(ret, tcg_ctx.tcg_env, addr, val, oi);
+            gen(ret, tcg_ctx->tcg_env, addr, val, oi);
             tcg_temp_free_i32(oi);
         }
 #else
-        gen(ret, tcg_ctx.tcg_env, addr, val);
+        gen(ret, tcg_ctx->tcg_env, addr, val);
 #endif
 #else
-        gen_helper_exit_atomic(tcg_ctx.tcg_env);
+        gen_helper_exit_atomic(tcg_ctx->tcg_env);
         /* Produce a result, so that we have a well-formed opcode stream
            with respect to uses of the result in the (dead) code following.  */
         tcg_gen_movi_i64(ret, 0);
@@ -3001,7 +3001,7 @@ static void * const table_##NAME[16] = {                                \
 void tcg_gen_atomic_##NAME##_i32                                        \
     (TCGv_i32 ret, TCGv addr, TCGv_i32 val, TCGArg idx, TCGMemOp memop) \
 {                                                                       \
-    if (tcg_ctx.tb_cflags & CF_PARALLEL) {                              \
+    if (tcg_ctx->tb_cflags & CF_PARALLEL) {                             \
         do_atomic_op_i32(ret, addr, val, idx, memop, table_##NAME);     \
     } else {                                                            \
         do_nonatomic_op_i32(ret, addr, val, idx, memop, NEW,            \
@@ -3011,7 +3011,7 @@ void tcg_gen_atomic_##NAME##_i32                                        \
 void tcg_gen_atomic_##NAME##_i64                                        \
     (TCGv_i64 ret, TCGv addr, TCGv_i64 val, TCGArg idx, TCGMemOp memop) \
 {                                                                       \
-    if (tcg_ctx.tb_cflags & CF_PARALLEL) {                              \
+    if (tcg_ctx->tb_cflags & CF_PARALLEL) {                             \
         do_atomic_op_i64(ret, addr, val, idx, memop, table_##NAME);     \
     } else {                                                            \
         do_nonatomic_op_i64(ret, addr, val, idx, memop, NEW,            \

tcg/tcg.c

@@ -243,7 +243,7 @@ static void tcg_out_label(TCGContext *s, TCGLabel *l, tcg_insn_unit *ptr)
 
 TCGLabel *gen_new_label(void)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     TCGLabel *l = tcg_malloc(sizeof(TCGLabel));
 
     *l = (TCGLabel){
@@ -382,6 +382,8 @@ void tcg_context_init(TCGContext *s)
     for (; i < ARRAY_SIZE(tcg_target_reg_alloc_order); ++i) {
         indirect_reg_alloc_order[i] = tcg_target_reg_alloc_order[i];
     }
+
+    tcg_ctx = s;
 }
 
 /*
@@ -522,7 +524,7 @@ void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size)
 
 TCGv_i32 tcg_global_reg_new_i32(TCGReg reg, const char *name)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     TCGTemp *t;
 
     if (tcg_regset_test_reg(s->reserved_regs, reg)) {
@@ -534,7 +536,7 @@ TCGv_i32 tcg_global_reg_new_i32(TCGReg reg, const char *name)
 
 TCGv_i64 tcg_global_reg_new_i64(TCGReg reg, const char *name)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     TCGTemp *t;
 
     if (tcg_regset_test_reg(s->reserved_regs, reg)) {
@@ -547,7 +549,7 @@ TCGv_i64 tcg_global_reg_new_i64(TCGReg reg, const char *name)
 TCGTemp *tcg_global_mem_new_internal(TCGType type, TCGv_ptr base,
                                      intptr_t offset, const char *name)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     TCGTemp *base_ts = tcgv_ptr_temp(base);
     TCGTemp *ts = tcg_global_alloc(s);
     int indirect_reg = 0, bigendian = 0;
@@ -602,7 +604,7 @@ TCGTemp *tcg_global_mem_new_internal(TCGType type, TCGv_ptr base,
 
 static TCGTemp *tcg_temp_new_internal(TCGType type, int temp_local)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     TCGTemp *ts;
     int idx, k;
 
@@ -659,7 +661,7 @@ TCGv_i64 tcg_temp_new_internal_i64(int temp_local)
 
 static void tcg_temp_free_internal(TCGTemp *ts)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     int k, idx;
 
 #if defined(CONFIG_DEBUG_TCG)
@@ -723,13 +725,13 @@ TCGv_i64 tcg_const_local_i64(int64_t val)
 #if defined(CONFIG_DEBUG_TCG)
 void tcg_clear_temp_count(void)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     s->temps_in_use = 0;
 }
 
 int tcg_check_temp_count(void)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     if (s->temps_in_use) {
         /* Clear the count so that we don't give another
          * warning immediately next time around.
@@ -969,7 +971,7 @@ bool tcg_op_supported(TCGOpcode op)
    and endian swap in tcg_reg_alloc_call(). */
 void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     int i, real_args, nb_rets, pi;
     unsigned sizemask, flags;
     TCGHelperInfo *info;
@@ -2908,7 +2910,7 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb)
 #ifdef CONFIG_PROFILER
 void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     int64_t tb_count = s->tb_count;
     int64_t tb_div_count = tb_count ? tb_count : 1;
     int64_t tot = s->interm_time + s->code_time;

tcg/tcg.h

@@ -688,12 +688,13 @@ struct TCGContext {
     target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
 };
 
-extern TCGContext tcg_ctx;
+extern TCGContext tcg_init_ctx;
+extern TCGContext *tcg_ctx;
 
 static inline size_t temp_idx(TCGTemp *ts)
 {
-    ptrdiff_t n = ts - tcg_ctx.temps;
-    tcg_debug_assert(n >= 0 && n < tcg_ctx.nb_temps);
+    ptrdiff_t n = ts - tcg_ctx->temps;
+    tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps);
     return n;
 }
 
@@ -713,7 +714,7 @@ static inline TCGTemp *arg_temp(TCGArg a)
 static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v)
 {
     uintptr_t o = (uintptr_t)v;
-    TCGTemp *t = (void *)&tcg_ctx + o;
+    TCGTemp *t = (void *)tcg_ctx + o;
     tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o);
     return t;
 }
@@ -746,7 +747,7 @@ static inline TCGArg tcgv_ptr_arg(TCGv_ptr v)
 static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t)
 {
     (void)temp_idx(t); /* trigger embedded assert */
-    return (TCGv_i32)((void *)t - (void *)&tcg_ctx);
+    return (TCGv_i32)((void *)t - (void *)tcg_ctx);
 }
 
 static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t)
@@ -773,13 +774,13 @@ static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
 
 static inline void tcg_set_insn_param(int op_idx, int arg, TCGArg v)
 {
-    tcg_ctx.gen_op_buf[op_idx].args[arg] = v;
+    tcg_ctx->gen_op_buf[op_idx].args[arg] = v;
 }
 
 /* The number of opcodes emitted so far.  */
 static inline int tcg_op_buf_count(void)
 {
-    return tcg_ctx.gen_next_op_idx;
+    return tcg_ctx->gen_next_op_idx;
 }
 
 /* Test for whether to terminate the TB for using too many opcodes.  */
@@ -798,7 +799,7 @@ TranslationBlock *tcg_tb_alloc(TCGContext *s);
 /* Called with tb_lock held.  */
 static inline void *tcg_malloc(int size)
 {
-    TCGContext *s = &tcg_ctx;
+    TCGContext *s = tcg_ctx;
     uint8_t *ptr, *ptr_end;
 
     /* ??? This is a weak placeholder for minimum malloc alignment.  */
@@ -807,7 +808,7 @@ static inline void *tcg_malloc(int size)
     ptr = s->pool_cur;
     ptr_end = ptr + size;
     if (unlikely(ptr_end > s->pool_end)) {
-        return tcg_malloc_internal(&tcg_ctx, size);
+        return tcg_malloc_internal(tcg_ctx, size);
     } else {
         s->pool_cur = ptr_end;
         return ptr;
@@ -1147,7 +1148,7 @@ static inline unsigned get_mmuidx(TCGMemOpIdx oi)
 uintptr_t tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr);
 #else
 # define tcg_qemu_tb_exec(env, tb_ptr) \
-    ((uintptr_t (*)(void *, void *))tcg_ctx.code_gen_prologue)(env, tb_ptr)
+    ((uintptr_t (*)(void *, void *))tcg_ctx->code_gen_prologue)(env, tb_ptr)
 #endif
 
 void tcg_register_jit(void *buf, size_t buf_size);