return success from snapshots

.envrc

@@ -0,0 +1 @@
+use_nix shell.nix

.gitignore

@@ -15,3 +15,7 @@ GTAGS
 *.depend_raw
 *.swp
 *.patch
+.ccls*
+.direnv
+.vscode
+.cache

accel/tcg/cpu-exec.c

@@ -851,6 +851,14 @@ static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb,
 #endif
 }
 
+//// --- Begin LibAFL code ---
+
+TranslationBlock *libafl_gen_edge(CPUState *cpu, target_ulong src_block,
+                                  target_ulong dst_block, target_ulong cs_base,
+                                  uint32_t flags, int cflags);
+
+//// --- End LibAFL code ---
+
 /* main execution loop */
 
 int cpu_exec(CPUState *cpu)
@@ -964,7 +972,27 @@ int cpu_exec(CPUState *cpu)
 #endif
             /* See if we can patch the calling TB. */
             if (last_tb) {
-                tb_add_jump(last_tb, tb_exit, tb);
+                // tb_add_jump(last_tb, tb_exit, tb);
+                
+                //// --- Begin LibAFL code ---
+
+                if (last_tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
+                    mmap_lock();
+                    TranslationBlock *edge = libafl_gen_edge(cpu, last_tb->pc, tb->pc,
+                                                             cs_base, flags, cflags);
+                    mmap_unlock();
+
+                    if (edge) {
+                        tb_add_jump(last_tb, tb_exit, edge);
+                        tb_add_jump(edge, 0, tb);
+                    } else {
+                        tb_add_jump(last_tb, tb_exit, tb);
+                    }
+                } else {
+                    tb_add_jump(last_tb, tb_exit, tb);
+                }
+
+                //// --- End LibAFL code ---
             }
 
             cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit);

accel/tcg/translate-all.c

@@ -61,6 +61,375 @@
 #include "tb-context.h"
 #include "internal.h"
 
+//// --- Begin LibAFL code ---
+
+#include "tcg/tcg-op.h"
+#include "tcg/tcg-internal.h"
+#include "exec/helper-head.h"
+
+void libafl_helper_table_add(TCGHelperInfo* info);
+TranslationBlock *libafl_gen_edge(CPUState *cpu, target_ulong src_block,
+                                  target_ulong dst_block, target_ulong cs_base,
+                                  uint32_t flags, int cflags);
+void libafl_gen_read(TCGv addr, MemOp ot);
+void libafl_gen_read_N(TCGv addr, uint32_t size);
+void libafl_gen_write(TCGv addr, MemOp ot);
+void libafl_gen_write_N(TCGv addr, uint32_t size);
+void libafl_gen_cmp(target_ulong pc, TCGv op0, TCGv op1, MemOp ot);
+
+void (*libafl_exec_edge_hook)(uint64_t id);
+uint64_t (*libafl_gen_edge_hook)(uint64_t src, uint64_t dst);
+
+static TCGHelperInfo libafl_exec_edge_hook_info = {
+    .func = NULL, .name = "libafl_exec_edge_hook", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i64, 1)
+};
+static int exec_edge_hook_added = 0;
+
+void (*libafl_exec_block_hook)(uint64_t id);
+uint64_t (*libafl_gen_block_hook)(uint64_t pc);
+
+static TCGHelperInfo libafl_exec_block_hook_info = {
+    .func = NULL, .name = "libafl_exec_block_hook", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i64, 1)
+};
+static int exec_block_hook_added = 0;
+
+void (*libafl_exec_read_hook1)(uint64_t id, uint64_t addr);
+void (*libafl_exec_read_hook2)(uint64_t id, uint64_t addr);
+void (*libafl_exec_read_hook4)(uint64_t id, uint64_t addr);
+void (*libafl_exec_read_hook8)(uint64_t id, uint64_t addr);
+void (*libafl_exec_read_hookN)(uint64_t id, uint64_t addr, uint32_t size);
+uint64_t (*libafl_gen_read_hook)(uint32_t size);
+
+static TCGHelperInfo libafl_exec_read_hook1_info = {
+    .func = NULL, .name = "libafl_exec_read_hook1", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_read_hook2_info = {
+    .func = NULL, .name = "libafl_exec_read_hook2", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_read_hook4_info = {
+    .func = NULL, .name = "libafl_exec_read_hook4", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_read_hook8_info = {
+    .func = NULL, .name = "libafl_exec_read_hook8", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_read_hookN_info = {
+    .func = NULL, .name = "libafl_exec_read_hookN", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1) | dh_typemask(i32, 2)
+};
+static int exec_read_hook_added = 0;
+
+void libafl_gen_read(TCGv addr, MemOp ot)
+{
+    uint32_t size = 0;
+    void* func = NULL;
+    switch (ot & MO_SIZE) {
+      case MO_64:
+        size = 8;
+        func = libafl_exec_read_hook8;
+        break;
+      case MO_32:
+        size = 4;
+        func = libafl_exec_read_hook4;
+        break;
+      case MO_16:
+        size = 2;
+        func = libafl_exec_read_hook2;
+        break;
+      case MO_8:
+        size = 1;
+        func = libafl_exec_read_hook1;
+        break;
+      default:
+        return;
+    }
+
+    uint32_t libafl_id = 0;
+    if (libafl_gen_read_hook)
+        libafl_id = libafl_gen_read_hook(size);
+    if (func && libafl_id != (uint32_t)-1) {
+        if (!exec_read_hook_added) {
+            exec_read_hook_added = 1;
+            libafl_exec_read_hook1_info.func = libafl_exec_read_hook1;
+            libafl_helper_table_add(&libafl_exec_read_hook1_info);
+            libafl_exec_read_hook2_info.func = libafl_exec_read_hook2;
+            libafl_helper_table_add(&libafl_exec_read_hook2_info);
+            libafl_exec_read_hook4_info.func = libafl_exec_read_hook4;
+            libafl_helper_table_add(&libafl_exec_read_hook4_info);
+            libafl_exec_read_hook8_info.func = libafl_exec_read_hook8;
+            libafl_helper_table_add(&libafl_exec_read_hook8_info);
+            libafl_exec_read_hookN_info.func = libafl_exec_read_hookN;
+            libafl_helper_table_add(&libafl_exec_read_hookN_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+        TCGTemp *tmp1[2] = { tcgv_i64_temp(tmp0),
+#if TARGET_LONG_BITS == 32
+                             tcgv_i32_temp(addr) };
+#else
+                             tcgv_i64_temp(addr) };
+#endif
+        tcg_gen_callN(func, NULL, 2, tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+}
+
+void libafl_gen_read_N(TCGv addr, uint32_t size)
+{
+    uint32_t libafl_id = 0;
+    if (libafl_gen_read_hook)
+        libafl_id = libafl_gen_read_hook(size);
+    if (libafl_id != (uint32_t)-1) {
+        if (!exec_read_hook_added) {
+            exec_read_hook_added = 1;
+            libafl_exec_read_hook1_info.func = libafl_exec_read_hook1;
+            libafl_helper_table_add(&libafl_exec_read_hook1_info);
+            libafl_exec_read_hook2_info.func = libafl_exec_read_hook2;
+            libafl_helper_table_add(&libafl_exec_read_hook2_info);
+            libafl_exec_read_hook4_info.func = libafl_exec_read_hook4;
+            libafl_helper_table_add(&libafl_exec_read_hook4_info);
+            libafl_exec_read_hook8_info.func = libafl_exec_read_hook8;
+            libafl_helper_table_add(&libafl_exec_read_hook8_info);
+            libafl_exec_read_hookN_info.func = libafl_exec_read_hookN;
+            libafl_helper_table_add(&libafl_exec_read_hookN_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+        TCGv_i32 tmp1 = tcg_const_i32(size);
+        TCGTemp *tmp2[3] = { tcgv_i64_temp(tmp0),
+#if TARGET_LONG_BITS == 32
+                             tcgv_i32_temp(addr),
+#else
+                             tcgv_i64_temp(addr),
+#endif
+                             tcgv_i32_temp(tmp1)
+        };
+        tcg_gen_callN(libafl_exec_read_hookN, NULL, 3, tmp2);
+        tcg_temp_free_i32(tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+}
+
+void (*libafl_exec_write_hook1)(uint64_t id, uint64_t addr);
+void (*libafl_exec_write_hook2)(uint64_t id, uint64_t addr);
+void (*libafl_exec_write_hook4)(uint64_t id, uint64_t addr);
+void (*libafl_exec_write_hook8)(uint64_t id, uint64_t addr);
+void (*libafl_exec_write_hookN)(uint64_t id, uint64_t addr, uint32_t size);
+uint64_t (*libafl_gen_write_hook)(uint32_t size);
+
+static TCGHelperInfo libafl_exec_write_hook1_info = {
+    .func = NULL, .name = "libafl_exec_write_hook1", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_write_hook2_info = {
+    .func = NULL, .name = "libafl_exec_write_hook2", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_write_hook4_info = {
+    .func = NULL, .name = "libafl_exec_write_hook4", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_write_hook8_info = {
+    .func = NULL, .name = "libafl_exec_write_hook8", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1)
+};
+static TCGHelperInfo libafl_exec_write_hookN_info = {
+    .func = NULL, .name = "libafl_exec_write_hookN", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(tl, 1) | dh_typemask(i32, 2)
+};
+static int exec_write_hook_added = 0;
+
+void libafl_gen_write(TCGv addr, MemOp ot)
+{
+    uint32_t size = 0;
+    void* func = NULL;
+    switch (ot & MO_SIZE) {
+      case MO_64:
+        size = 8;
+        func = libafl_exec_write_hook8;
+        break;
+      case MO_32:
+        size = 4;
+        func = libafl_exec_write_hook4;
+        break;
+      case MO_16:
+        size = 2;
+        func = libafl_exec_write_hook2;
+        break;
+      case MO_8:
+        size = 1;
+        func = libafl_exec_write_hook1;
+        break;
+      default:
+        return;
+    }
+
+    uint32_t libafl_id = 0;
+    if (libafl_gen_write_hook)
+        libafl_id = libafl_gen_write_hook(size);
+    if (func && libafl_id != (uint32_t)-1) {
+        if (!exec_write_hook_added) {
+            exec_write_hook_added = 1;
+            libafl_exec_write_hook1_info.func = libafl_exec_write_hook1;
+            libafl_helper_table_add(&libafl_exec_write_hook1_info);
+            libafl_exec_write_hook2_info.func = libafl_exec_write_hook2;
+            libafl_helper_table_add(&libafl_exec_write_hook2_info);
+            libafl_exec_write_hook4_info.func = libafl_exec_write_hook4;
+            libafl_helper_table_add(&libafl_exec_write_hook4_info);
+            libafl_exec_write_hook8_info.func = libafl_exec_write_hook8;
+            libafl_helper_table_add(&libafl_exec_write_hook8_info);
+            libafl_exec_write_hookN_info.func = libafl_exec_write_hookN;
+            libafl_helper_table_add(&libafl_exec_write_hookN_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+        TCGTemp *tmp1[2] = { tcgv_i64_temp(tmp0),
+#if TARGET_LONG_BITS == 32
+                             tcgv_i32_temp(addr) };
+#else
+                             tcgv_i64_temp(addr) };
+#endif
+        tcg_gen_callN(func, NULL, 2, tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+}
+
+void libafl_gen_write_N(TCGv addr, uint32_t size)
+{
+    uint32_t libafl_id = 0;
+    if (libafl_gen_write_hook)
+        libafl_id = libafl_gen_write_hook(size);
+    if (libafl_id != (uint32_t)-1) {
+        if (!exec_write_hook_added) {
+            exec_write_hook_added = 1;
+            libafl_exec_write_hook1_info.func = libafl_exec_write_hook1;
+            libafl_helper_table_add(&libafl_exec_write_hook1_info);
+            libafl_exec_write_hook2_info.func = libafl_exec_write_hook2;
+            libafl_helper_table_add(&libafl_exec_write_hook2_info);
+            libafl_exec_write_hook4_info.func = libafl_exec_write_hook4;
+            libafl_helper_table_add(&libafl_exec_write_hook4_info);
+            libafl_exec_write_hook8_info.func = libafl_exec_write_hook8;
+            libafl_helper_table_add(&libafl_exec_write_hook8_info);
+            libafl_exec_write_hookN_info.func = libafl_exec_write_hookN;
+            libafl_helper_table_add(&libafl_exec_write_hookN_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+        TCGv_i32 tmp1 = tcg_const_i32(size);
+        TCGTemp *tmp2[3] = { tcgv_i64_temp(tmp0),
+#if TARGET_LONG_BITS == 32
+                             tcgv_i32_temp(addr),
+#else
+                             tcgv_i64_temp(addr),
+#endif
+                             tcgv_i32_temp(tmp1)
+        };
+        tcg_gen_callN(libafl_exec_write_hookN, NULL, 3, tmp2);
+        tcg_temp_free_i32(tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+}
+
+
+void (*libafl_exec_cmp_hook1)(uint64_t id, uint8_t v0, uint8_t v1);
+void (*libafl_exec_cmp_hook2)(uint64_t id, uint16_t v0, uint16_t v1);
+void (*libafl_exec_cmp_hook4)(uint64_t id, uint32_t v0, uint32_t v1);
+void (*libafl_exec_cmp_hook8)(uint64_t id, uint64_t v0, uint64_t v1);
+uint64_t (*libafl_gen_cmp_hook)(uint64_t pc, uint32_t size);
+
+static TCGHelperInfo libafl_exec_cmp_hook1_info = {
+    .func = NULL, .name = "libafl_exec_cmp_hook1", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i32, 1)
+    | dh_typemask(tl, 2) | dh_typemask(tl, 3)
+};
+static TCGHelperInfo libafl_exec_cmp_hook2_info = {
+    .func = NULL, .name = "libafl_exec_cmp_hook2", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i32, 1)
+    | dh_typemask(tl, 2) | dh_typemask(tl, 3)
+};
+static TCGHelperInfo libafl_exec_cmp_hook4_info = {
+    .func = NULL, .name = "libafl_exec_cmp_hook4", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i32, 1)
+    | dh_typemask(tl, 2) | dh_typemask(tl, 3)
+};
+static TCGHelperInfo libafl_exec_cmp_hook8_info = {
+    .func = NULL, .name = "libafl_exec_cmp_hook8", \
+    .flags = dh_callflag(void), \
+    .typemask = dh_typemask(void, 0) | dh_typemask(i32, 1)
+    | dh_typemask(tl, 2) | dh_typemask(tl, 3)
+};
+static int exec_cmp_hook_added = 0;
+
+void libafl_gen_cmp(target_ulong pc, TCGv op0, TCGv op1, MemOp ot)
+{
+    uint32_t size = 0;
+    void* func = NULL;
+    switch (ot & MO_SIZE) {
+      case MO_64:
+        size = 8;
+        func = libafl_exec_cmp_hook8;
+        break;
+      case MO_32:
+        size = 4;
+        func = libafl_exec_cmp_hook4;
+        break;
+      case MO_16:
+        size = 2;
+        func = libafl_exec_cmp_hook2;
+        break;
+      case MO_8:
+        size = 1;
+        func = libafl_exec_cmp_hook1;
+        break;
+      default:
+        return;
+    }
+
+    uint32_t libafl_id = 0;
+    if (libafl_gen_cmp_hook)
+        libafl_id = libafl_gen_cmp_hook((uint64_t)pc, size);
+    if (func && libafl_id != (uint32_t)-1) {
+        if (!exec_cmp_hook_added) {
+            exec_cmp_hook_added = 1;
+            libafl_exec_cmp_hook1_info.func = libafl_exec_cmp_hook1;
+            libafl_helper_table_add(&libafl_exec_cmp_hook1_info);
+            libafl_exec_cmp_hook2_info.func = libafl_exec_cmp_hook2;
+            libafl_helper_table_add(&libafl_exec_cmp_hook2_info);
+            libafl_exec_cmp_hook4_info.func = libafl_exec_cmp_hook4;
+            libafl_helper_table_add(&libafl_exec_cmp_hook4_info);
+            libafl_exec_cmp_hook8_info.func = libafl_exec_cmp_hook8;
+            libafl_helper_table_add(&libafl_exec_cmp_hook8_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+        TCGTemp *tmp1[3] = { tcgv_i64_temp(tmp0),
+#if TARGET_LONG_BITS == 32
+                             tcgv_i32_temp(op0), tcgv_i32_temp(op1) };
+#else
+                             tcgv_i64_temp(op0), tcgv_i64_temp(op1) };
+#endif
+        tcg_gen_callN(func, NULL, 3, tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+}
+
+//// --- End LibAFL code ---
+
 /* #define DEBUG_TB_INVALIDATE */
 /* #define DEBUG_TB_FLUSH */
 /* make various TB consistency checks */
@@ -1400,6 +1769,122 @@ tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
     return tb;
 }
 
+//// --- Begin LibAFL code ---
+
+/* Called with mmap_lock held for user mode emulation.  */
+TranslationBlock *libafl_gen_edge(CPUState *cpu, target_ulong src_block,
+                                  target_ulong dst_block, target_ulong cs_base,
+                                  uint32_t flags, int cflags)
+{
+    CPUArchState *env = cpu->env_ptr;
+    TranslationBlock *tb;
+    tcg_insn_unit *gen_code_buf;
+    int gen_code_size, search_size;
+
+    assert_memory_lock();
+
+    uint32_t libafl_id = 0;
+    if (libafl_gen_edge_hook)
+        libafl_id = libafl_gen_edge_hook((uint64_t)src_block, (uint64_t)dst_block);
+    if (!libafl_exec_edge_hook || libafl_id == (uint32_t)-1)
+        return NULL;
+
+    if (!exec_edge_hook_added) {
+        exec_edge_hook_added = 1;
+        libafl_exec_edge_hook_info.func = libafl_exec_edge_hook;
+        libafl_helper_table_add(&libafl_exec_edge_hook_info);
+    }
+
+ buffer_overflow1:
+    tb = tcg_tb_alloc(tcg_ctx);
+    if (unlikely(!tb)) {
+        /* flush must be done */
+        tb_flush(cpu);
+        mmap_unlock();
+        /* Make the execution loop process the flush as soon as possible.  */
+        cpu->exception_index = EXCP_INTERRUPT;
+        cpu_loop_exit(cpu);
+    }
+
+    libafl_exec_edge_hook(libafl_id);
+
+    gen_code_buf = tcg_ctx->code_gen_ptr;
+    tb->tc.ptr = gen_code_buf;
+    tb->pc = 0;
+    tb->cs_base = cs_base;
+    tb->flags = flags;
+    tb->cflags = cflags;
+    tb->trace_vcpu_dstate = *cpu->trace_dstate;
+    tcg_ctx->tb_cflags = 0;
+
+    tcg_func_start(tcg_ctx);
+
+    tcg_ctx->cpu = env_cpu(env);
+    
+    TCGv_i64 tmp0 = tcg_const_i64(libafl_id);
+    TCGTemp *tmp1[1] = { tcgv_i64_temp(tmp0) };
+    tcg_gen_callN(libafl_exec_edge_hook, NULL, 1, tmp1);
+    tcg_temp_free_i64(tmp0);
+
+    tcg_gen_goto_tb(0);
+    tcg_gen_exit_tb(tb, 0);
+
+    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;
+    if (TCG_TARGET_HAS_direct_jump) {
+        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;
+    }
+
+    /* ??? Overflow could be handled better here.  In particular, we
+       don't need to re-do gen_intermediate_code, nor should we re-do
+       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);
+    if (unlikely(gen_code_size < 0)) {
+        goto buffer_overflow1;
+    }
+    search_size = encode_search(tb, (void *)gen_code_buf + gen_code_size);
+    if (unlikely(search_size < 0)) {
+        goto buffer_overflow1;
+    }
+    tb->tc.size = gen_code_size;
+
+    qatomic_set(&tcg_ctx->code_gen_ptr, (void *)
+        ROUND_UP((uintptr_t)gen_code_buf + gen_code_size + search_size,
+                 CODE_GEN_ALIGN));
+
+    /* init jump list */
+    qemu_spin_init(&tb->jmp_lock);
+    tb->jmp_list_head = (uintptr_t)NULL;
+    tb->jmp_list_next[0] = (uintptr_t)NULL;
+    tb->jmp_list_next[1] = (uintptr_t)NULL;
+    tb->jmp_dest[0] = (uintptr_t)NULL;
+    tb->jmp_dest[1] = (uintptr_t)NULL;
+
+    /* init original jump addresses which have been set during tcg_gen_code() */
+    if (tb->jmp_reset_offset[0] != TB_JMP_RESET_OFFSET_INVALID) {
+        tb_reset_jump(tb, 0);
+    }
+    if (tb->jmp_reset_offset[1] != TB_JMP_RESET_OFFSET_INVALID) {
+        tb_reset_jump(tb, 1);
+    }
+
+    return tb;
+}
+
+//// --- End LibAFL code ---
+
 /* Called with mmap_lock held for user mode emulation.  */
 TranslationBlock *tb_gen_code(CPUState *cpu,
                               target_ulong pc, target_ulong cs_base,
@@ -1467,6 +1952,26 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
     tcg_func_start(tcg_ctx);
 
     tcg_ctx->cpu = env_cpu(env);
+
+    //// --- Begin LibAFL code ---
+
+    uint32_t libafl_id = 0;
+    if (libafl_gen_block_hook)
+        libafl_id = libafl_gen_block_hook((uint64_t)pc);
+    if (libafl_exec_block_hook && libafl_id != (uint32_t)-1) {
+        if (!exec_block_hook_added) {
+            exec_block_hook_added = 1;
+            libafl_exec_block_hook_info.func = libafl_exec_block_hook;
+            libafl_helper_table_add(&libafl_exec_block_hook_info);
+        }
+        TCGv_i64 tmp0 = tcg_const_i64((uint64_t)pc);
+        TCGTemp *tmp1[1] = { tcgv_i64_temp(tmp0) };
+        tcg_gen_callN(libafl_exec_block_hook, NULL, 1, tmp1);
+        tcg_temp_free_i64(tmp0);
+    }
+    
+    //// --- End LibAFL code ---
+
     gen_intermediate_code(cpu, tb, max_insns);
     assert(tb->size != 0);
     tcg_ctx->cpu = NULL;

accel/tcg/translator.c

@@ -18,6 +18,22 @@
 #include "exec/plugin-gen.h"
 #include "sysemu/replay.h"
 
+//// --- Begin LibAFL code ---
+
+#include "tcg/tcg-internal.h"
+
+struct libafl_hook {
+    target_ulong addr;
+    void (*callback)(uint64_t);
+    uint64_t value;
+    TCGHelperInfo helper_info;
+    struct libafl_hook* next;
+};
+
+extern struct libafl_hook* libafl_qemu_hooks;
+
+//// --- End LibAFL code ---
+
 /* Pairs with tcg_clear_temp_count.
    To be called by #TranslatorOps.{translate_insn,tb_stop} if
    (1) the target is sufficiently clean to support reporting,
@@ -79,6 +95,21 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
             plugin_gen_insn_start(cpu, db);
         }
 
+        //// --- Begin LibAFL code ---
+
+        struct libafl_hook* hk = libafl_qemu_hooks;
+        while (hk) {
+            if (hk->addr == db->pc_next) {
+                TCGv_i64 tmp0 = tcg_const_i64(hk->value);
+                TCGTemp *tmp1[1] = { tcgv_i64_temp(tmp0) };
+                tcg_gen_callN(hk->callback, NULL, 1, tmp1);
+                tcg_temp_free_i64(tmp0);
+            }
+            hk = hk->next;
+        }
+
+        //// --- End LibAFL code ---
+
         /* Disassemble one instruction.  The translate_insn hook should
            update db->pc_next and db->is_jmp to indicate what should be
            done next -- either exiting this loop or locate the start of

configure

@@ -835,6 +835,8 @@ if test "$mingw32" = "yes" ; then
 fi
 
 werror=""
+as_shared_lib="no"
+as_static_lib="no"
 
 for opt do
   optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)')
@@ -1581,6 +1583,16 @@ for opt do
   ;;
   --disable-slirp-smbd) slirp_smbd=no
   ;;
+  --as-shared-lib)
+      as_shared_lib="yes"
+      QEMU_CFLAGS="$QEMU_CFLAGS -fPIC -DAS_LIB=1"
+      QEMU_CXXFLAGS="$QEMU_CXXFLAGS -fPIC -DAS_LIB=1"
+  ;;
+  --as-static-lib)
+      as_static_lib="yes"
+      QEMU_CFLAGS="$QEMU_CFLAGS -fPIC -DAS_LIB=1"
+      QEMU_CXXFLAGS="$QEMU_CXXFLAGS -fPIC -DAS_LIB=1"
+  ;;
   *)
       echo "ERROR: unknown option $opt"
       echo "Try '$0 --help' for more information"
@@ -4919,6 +4931,13 @@ if test "$secret_keyring" = "yes" ; then
   echo "CONFIG_SECRET_KEYRING=y" >> $config_host_mak
 fi
 
+if test "$as_shared_lib" = "yes" ; then
+  echo "AS_SHARED_LIB=y" >> $config_host_mak
+fi
+if test "$as_static_lib" = "yes" ; then
+  echo "AS_STATIC_LIB=y" >> $config_host_mak
+fi
+
 echo "ROMS=$roms" >> $config_host_mak
 echo "MAKE=$make" >> $config_host_mak
 echo "PYTHON=$python" >> $config_host_mak

cpu.c

@@ -40,6 +40,140 @@
 #include "hw/core/accel-cpu.h"
 #include "trace/trace-root.h"
 
+//// --- Begin LibAFL code ---
+
+#include "tcg/tcg-op.h"
+#include "tcg/tcg-internal.h"
+#include "exec/helper-head.h"
+
+struct libafl_hook {
+    target_ulong addr;
+    void (*callback)(uint64_t);
+    uint64_t value;
+    TCGHelperInfo helper_info;
+    struct libafl_hook* next;
+};
+
+struct libafl_hook* libafl_qemu_hooks = NULL;
+
+__thread CPUArchState *libafl_qemu_env;
+
+void libafl_helper_table_add(TCGHelperInfo* info);
+
+static GByteArray *libafl_qemu_mem_buf = NULL;
+
+int libafl_qemu_write_reg(int reg, uint8_t* val);
+int libafl_qemu_read_reg(int reg, uint8_t* val);
+int libafl_qemu_num_regs(void);
+int libafl_qemu_set_hook(uint64_t addr, void (*callback)(uint64_t), uint64_t value);
+int libafl_qemu_remove_hook(uint64_t addr);
+
+int libafl_qemu_write_reg(int reg, uint8_t* val)
+{
+    CPUState *cpu = current_cpu;
+    if (!cpu) {
+        cpu = env_cpu(libafl_qemu_env);
+        if (!cpu) {
+            return 0;
+        }
+    }
+
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+    if (reg < cc->gdb_num_core_regs) {
+        return cc->gdb_write_register(cpu, val, reg);
+    }
+    return 0;
+}
+
+int libafl_qemu_read_reg(int reg, uint8_t* val)
+{
+    CPUState *cpu = current_cpu;
+    if (!cpu) {
+        cpu = env_cpu(libafl_qemu_env);
+        if (!cpu) {
+            return 0;
+        }
+    }
+
+    if (libafl_qemu_mem_buf == NULL) {
+        libafl_qemu_mem_buf = g_byte_array_sized_new(64);
+    }
+
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+    if (reg < cc->gdb_num_core_regs) {
+        g_byte_array_set_size(libafl_qemu_mem_buf, 0);
+        int len = cc->gdb_read_register(cpu, libafl_qemu_mem_buf, reg);
+        if (len > 0) {
+            memcpy(val, libafl_qemu_mem_buf->data, len);
+        }
+        return len;
+    }
+    return 0;
+}
+
+int libafl_qemu_num_regs(void)
+{
+    CPUState *cpu = current_cpu;
+    if (!cpu) {
+        cpu = env_cpu(libafl_qemu_env);
+        if (!cpu) {
+            return 0;
+        }
+    }
+
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+    return cc->gdb_num_core_regs;
+}
+
+void libafl_breakpoint_invalidate(CPUState *cpu, target_ulong pc);
+
+int libafl_qemu_set_hook(uint64_t addr, void (*callback)(uint64_t), uint64_t value)
+{
+    CPUState *cpu;
+
+    target_ulong pc = (target_ulong) addr;
+    CPU_FOREACH(cpu) {
+        libafl_breakpoint_invalidate(cpu, pc);
+    }
+
+    struct libafl_hook* hk = malloc(sizeof(struct libafl_hook));
+    hk->addr = pc;
+    hk->callback = callback;
+    hk->value = value;
+    hk->helper_info.func = callback;
+    hk->helper_info.name = "libafl_hook";
+    hk->helper_info.flags = dh_callflag(void);
+    hk->helper_info.typemask = dh_typemask(void, 0) | dh_typemask(i64, 1);
+    hk->next = libafl_qemu_hooks;
+    libafl_qemu_hooks = hk;
+    libafl_helper_table_add(&hk->helper_info);
+    return 1;
+}
+
+int libafl_qemu_remove_hook(uint64_t addr)
+{
+    CPUState *cpu;
+    int r = 0;
+
+    target_ulong pc = (target_ulong) addr;
+    struct libafl_hook** hk = &libafl_qemu_hooks;
+    while (*hk) {
+        if ((*hk)->addr == pc) {
+            CPU_FOREACH(cpu) {
+                libafl_breakpoint_invalidate(cpu, pc);
+            }
+
+            *hk = (*hk)->next;
+            r = 1;
+        } else {
+            hk = &(*hk)->next;
+        }
+    }
+    return r;
+}
+
+//// --- End LibAFL code ---
+
 uintptr_t qemu_host_page_size;
 intptr_t qemu_host_page_mask;
 
@@ -58,7 +192,7 @@ static int cpu_common_post_load(void *opaque, int version_id)
      * memory we've translated code from. So we must flush all TBs,
      * which will now be stale.
      */
-    tb_flush(cpu);
+    // tb_flush(cpu);
 
     return 0;
 }
@@ -225,6 +359,15 @@ void tb_invalidate_phys_addr(target_ulong addr)
     tb_invalidate_phys_page_range(addr, addr + 1);
     mmap_unlock();
 }
+
+//// --- Begin LibAFL code ---
+
+void libafl_breakpoint_invalidate(CPUState *cpu, target_ulong pc)
+{
+    tb_invalidate_phys_addr(pc);
+}
+
+//// --- End LibAFL code ---
 #else
 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
 {
@@ -245,6 +388,15 @@ void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs)
     ram_addr = memory_region_get_ram_addr(mr) + addr;
     tb_invalidate_phys_page_range(ram_addr, ram_addr + 1);
 }
+
+//// --- Begin LibAFL code ---
+
+void libafl_breakpoint_invalidate(CPUState *cpu, target_ulong pc)
+{
+    tb_flush(cpu);
+}
+
+//// --- End LibAFL code ---
 #endif
 
 /* Add a breakpoint.  */

meson.build

@@ -1797,7 +1797,8 @@ if capstone_opt == 'internal'
                                build_by_default: false,
                                sources: capstone_files,
                                c_args: capstone_cargs,
-                               include_directories: 'capstone/include')
+                               include_directories: 'capstone/include',
+                               pic: 'AS_SHARED_LIB' in config_host)
   capstone = declare_dependency(link_with: libcapstone,
                                 include_directories: 'capstone/include/capstone')
 endif
@@ -1877,7 +1878,8 @@ if have_system
                               build_by_default: false,
                               sources: slirp_files,
                               c_args: slirp_cargs,
-                              include_directories: slirp_inc)
+                              include_directories: slirp_inc,
+                              pic: 'AS_SHARED_LIB' in config_host)
     slirp = declare_dependency(link_with: libslirp,
                                dependencies: slirp_deps,
                                include_directories: slirp_inc)
@@ -1934,7 +1936,8 @@ if have_system
     libfdt = static_library('fdt',
                             build_by_default: false,
                             sources: fdt_files,
-                            include_directories: fdt_inc)
+                            include_directories: fdt_inc,
+                            pic: 'AS_SHARED_LIB' in config_host)
     fdt = declare_dependency(link_with: libfdt,
                              include_directories: fdt_inc)
   endif
@@ -2202,7 +2205,8 @@ util_ss.add_all(trace_ss)
 util_ss = util_ss.apply(config_all, strict: false)
 libqemuutil = static_library('qemuutil',
                              sources: util_ss.sources() + stub_ss.sources() + genh,
-                             dependencies: [util_ss.dependencies(), libm, threads, glib, socket, malloc, pixman])
+                             dependencies: [util_ss.dependencies(), libm, threads, glib, socket, malloc, pixman],
+                             pic: 'AS_SHARED_LIB' in config_host)
 qemuutil = declare_dependency(link_with: libqemuutil,
                               sources: genh + version_res)
 
@@ -2267,7 +2271,8 @@ if get_option('b_lto')
     pagevary_flags += '-fno-sanitize=cfi-icall'
   endif
   pagevary = static_library('page-vary-common', sources: pagevary,
-                            c_args: pagevary_flags)
+                            c_args: pagevary_flags,
+                            pic: 'AS_SHARED_LIB' in config_host)
   pagevary = declare_dependency(link_with: pagevary)
 endif
 common_ss.add(pagevary)
@@ -2393,7 +2398,8 @@ if enable_modules
                               input: modinfo_files,
                               command: [modinfo_generate, '@INPUT@'],
                               capture: true)
-  modinfo_lib = static_library('modinfo', modinfo_src)
+  modinfo_lib = static_library('modinfo', modinfo_src,
+                               pic: 'AS_SHARED_LIB' in config_host)
   modinfo_dep = declare_dependency(link_whole: modinfo_lib)
   softmmu_ss.add(modinfo_dep)
 endif
@@ -2412,7 +2418,8 @@ qemu_syms = custom_target('qemu.syms', output: 'qemu.syms',
 qom_ss = qom_ss.apply(config_host, strict: false)
 libqom = static_library('qom', qom_ss.sources() + genh,
                         dependencies: [qom_ss.dependencies()],
-                        name_suffix: 'fa')
+                        name_suffix: 'fa',
+                        pic: 'AS_SHARED_LIB' in config_host)
 
 qom = declare_dependency(link_whole: libqom)
 
@@ -2420,7 +2427,8 @@ authz_ss = authz_ss.apply(config_host, strict: false)
 libauthz = static_library('authz', authz_ss.sources() + genh,
                           dependencies: [authz_ss.dependencies()],
                           name_suffix: 'fa',
-                          build_by_default: false)
+                          build_by_default: false,
+                          pic: 'AS_SHARED_LIB' in config_host)
 
 authz = declare_dependency(link_whole: libauthz,
                            dependencies: qom)
@@ -2429,7 +2437,8 @@ crypto_ss = crypto_ss.apply(config_host, strict: false)
 libcrypto = static_library('crypto', crypto_ss.sources() + genh,
                            dependencies: [crypto_ss.dependencies()],
                            name_suffix: 'fa',
-                           build_by_default: false)
+                           build_by_default: false,
+                           pic: 'AS_SHARED_LIB' in config_host)
 
 crypto = declare_dependency(link_whole: libcrypto,
                             dependencies: [authz, qom])
@@ -2439,13 +2448,15 @@ libio = static_library('io', io_ss.sources() + genh,
                        dependencies: [io_ss.dependencies()],
                        link_with: libqemuutil,
                        name_suffix: 'fa',
-                       build_by_default: false)
+                       build_by_default: false,
+                       pic: 'AS_SHARED_LIB' in config_host)
 
 io = declare_dependency(link_whole: libio, dependencies: [crypto, qom])
 
 libmigration = static_library('migration', sources: migration_files + genh,
                               name_suffix: 'fa',
-                              build_by_default: false)
+                              build_by_default: false,
+                              pic: 'AS_SHARED_LIB' in config_host)
 migration = declare_dependency(link_with: libmigration,
                                dependencies: [zlib, qom, io])
 softmmu_ss.add(migration)
@@ -2455,7 +2466,8 @@ libblock = static_library('block', block_ss.sources() + genh,
                           dependencies: block_ss.dependencies(),
                           link_depends: block_syms,
                           name_suffix: 'fa',
-                          build_by_default: false)
+                          build_by_default: false,
+                          pic: 'AS_SHARED_LIB' in config_host)
 
 block = declare_dependency(link_whole: [libblock],
                            link_args: '@block.syms',
@@ -2465,7 +2477,8 @@ blockdev_ss = blockdev_ss.apply(config_host, strict: false)
 libblockdev = static_library('blockdev', blockdev_ss.sources() + genh,
                              dependencies: blockdev_ss.dependencies(),
                              name_suffix: 'fa',
-                             build_by_default: false)
+                             build_by_default: false,
+                             pic: 'AS_SHARED_LIB' in config_host)
 
 blockdev = declare_dependency(link_whole: [libblockdev],
                               dependencies: [block])
@@ -2474,20 +2487,23 @@ qmp_ss = qmp_ss.apply(config_host, strict: false)
 libqmp = static_library('qmp', qmp_ss.sources() + genh,
                         dependencies: qmp_ss.dependencies(),
                         name_suffix: 'fa',
-                        build_by_default: false)
+                        build_by_default: false,
+                        pic: 'AS_SHARED_LIB' in config_host)
 
 qmp = declare_dependency(link_whole: [libqmp])
 
 libchardev = static_library('chardev', chardev_ss.sources() + genh,
                             name_suffix: 'fa',
                             dependencies: [gnutls],
-                            build_by_default: false)
+                            build_by_default: false,
+                            pic: 'AS_SHARED_LIB' in config_host)
 
 chardev = declare_dependency(link_whole: libchardev)
 
 libhwcore = static_library('hwcore', sources: hwcore_files + genh,
                            name_suffix: 'fa',
-                           build_by_default: false)
+                           build_by_default: false,
+                           pic: 'AS_SHARED_LIB' in config_host)
 hwcore = declare_dependency(link_whole: libhwcore)
 common_ss.add(hwcore)
 
@@ -2515,7 +2531,8 @@ common_all = static_library('common',
                             sources: common_all.sources() + genh,
                             implicit_include_directories: false,
                             dependencies: common_all.dependencies(),
-                            name_suffix: 'fa')
+                            name_suffix: 'fa',
+                            pic: 'AS_SHARED_LIB' in config_host)
 
 feature_to_c = find_program('scripts/feature_to_c.sh')
 
@@ -2609,7 +2626,8 @@ foreach target : target_dirs
                  include_directories: target_inc,
                  c_args: c_args,
                  build_by_default: false,
-                 name_suffix: 'fa')
+                 name_suffix: 'fa',
+                 pic: 'AS_SHARED_LIB' in config_host)
 
   if target.endswith('-softmmu')
     execs = [{
@@ -2649,15 +2667,34 @@ foreach target : target_dirs
       exe_name += '-unsigned'
     endif
 
-    emulator = executable(exe_name, exe['sources'],
+    if 'AS_SHARED_LIB' not in config_host and 'AS_STATIC_LIB' not in config_host
-               install: true,
+      emulator = executable(exe_name, exe['sources'],
-               c_args: c_args,
+                install: true,
-               dependencies: arch_deps + deps + exe['dependencies'],
+                c_args: c_args,
-               objects: lib.extract_all_objects(recursive: true),
+                dependencies: arch_deps + deps + exe['dependencies'],
-               link_language: link_language,
+                objects: lib.extract_all_objects(recursive: true),
-               link_depends: [block_syms, qemu_syms] + exe.get('link_depends', []),
+                link_language: link_language,
-               link_args: link_args,
+                link_depends: [block_syms, qemu_syms] + exe.get('link_depends', []),
-               gui_app: exe['gui'])
+                link_args: link_args,
+                gui_app: exe['gui'])
+    else
+        if 'AS_SHARED_LIB' in config_host
+            emulator = shared_library(exe_name, exe['sources'],
+                   install: true,
+                   c_args: c_args,
+                   dependencies: arch_deps + deps + exe['dependencies'],
+                   objects: lib.extract_all_objects(recursive: true),
+                   link_language: link_language,
+                   link_depends: [block_syms, qemu_syms] + exe.get('link_depends', []),
+                   link_args: link_args)
+        endif
+        if 'AS_STATIC_LIB' in config_host
+            emulator = static_library(exe_name, exe['sources'],
+                   c_args: c_args,
+                   dependencies: arch_deps + deps + exe['dependencies'],
+                   objects: lib.extract_all_objects(recursive: true))
+        endif
+    endif
 
     if targetos == 'darwin'
       icon = 'pc-bios/qemu.rsrc'

myconfigure.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+cd "$(dirname "$0")"
+mkdir -p build
+cd build
+../configure --target-list=arm-linux-user,arm-softmmu,x86_64-linux-user,x86_64-softmmu \
+                --audio-drv-list= \
+                --disable-blobs \
+                --disable-bochs \
+                --disable-brlapi \
+                --disable-bsd-user \
+                --disable-bzip2 \
+                --disable-cap-ng \
+                --disable-cloop \
+                --disable-curl \
+                --disable-curses \
+                --disable-dmg \
+                --enable-fdt \
+                --disable-gcrypt \
+                --disable-glusterfs \
+                --disable-gnutls \
+                --disable-gtk \
+                --disable-guest-agent \
+                --disable-iconv \
+                --disable-libiscsi \
+                --disable-libnfs \
+                --disable-libssh \
+                --disable-libusb \
+                --disable-linux-aio \
+                --disable-live-block-migration \
+                --disable-lzo \
+                --disable-nettle \
+                --disable-numa \
+                --disable-opengl \
+                --disable-parallels \
+                --disable-plugins \
+                --disable-qcow1 \
+                --disable-qed \
+                --disable-rbd \
+                --disable-rdma \
+                --disable-replication \
+                --disable-sdl \
+                --disable-seccomp \
+                --disable-smartcard \
+                --disable-snappy \
+                --disable-spice \
+                --enable-system \
+                --disable-tools \
+                --disable-tpm \
+                --disable-usb-redir \
+                --disable-vde \
+                --disable-vdi \
+                --disable-vhost-crypto \
+                --disable-vhost-kernel \
+                --disable-vhost-net \
+                --disable-vhost-scsi \
+                --disable-vhost-user \
+                --disable-vhost-vdpa \
+                --disable-vhost-vsock \
+                --disable-virglrenderer \
+                --disable-virtfs \
+                --disable-vnc \
+                --disable-vnc-jpeg \
+                --disable-vnc-png \
+                --disable-vnc-sasl \
+                --disable-vte \
+                --disable-vvfat \
+                --disable-xen \
+                --disable-xen-pci-passthrough \
+                --disable-xfsctl \
+                --as-shared-lib

shell.nix

@@ -0,0 +1,17 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+with pkgs;
+stdenv.mkDerivation {
+  name = "tccboot-1";
+  hardeningDisable = [ "all" ];
+  src = ./.;
+  buildInputs = [
+    glib
+    python3
+    pkg-config
+    ninja
+    meson
+    pixman
+    gcc-arm-embedded
+  ];
+}

softmmu/cpus.c

@@ -305,7 +305,10 @@ void cpu_handle_guest_debug(CPUState *cpu)
             cpu_single_step(cpu, 0);
         }
     } else {
-        gdb_set_stop_cpu(cpu);
+        /* Begin LibAFL changes */
+        // With LibAFL Breakpoints there is no gdb attached.
+        // gdb_set_stop_cpu(cpu);
+        /* End LibAFL changes */
         qemu_system_debug_request();
         cpu->stopped = true;
     }

softmmu/main.c

@@ -44,11 +44,84 @@ int main(int argc, char **argv)
 #define main qemu_main
 #endif /* CONFIG_COCOA */
 
+/* Begin LibAFL instrumentation */
+#include "sysemu/runstate.h"
+#include "migration/snapshot.h"
+#include "hw/core/cpu.h"
+#include "qapi/error.h"
+#include "exec/memory.h"
+void libafl_qemu_main_loop( void );
+void libafl_qemu_sys_init(int argc, char **argv, char **envp);
+void libafl_qemu_cleanup( void );
+
+void libafl_qemu_sys_init(int argc, char **argv, char **envp) { qemu_init(argc, argv, envp); }
+void libafl_qemu_cleanup( void ) { qemu_cleanup(); }
+void libafl_qemu_set_breakpoint( vaddr );
+int libafl_snapshot_save( const char* );
+int libafl_snapshot_load( const char* );
+void libafl_phys_read(vaddr, uint8_t*, int);
+void libafl_phys_write(vaddr, uint8_t*, int);
+
+void libafl_qemu_main_loop( void )
+{
+    vm_start();
+    qemu_main_loop();
+}
+
+void libafl_qemu_set_breakpoint(vaddr pc)
+{
+    CPUState *cpu;
+    CPU_FOREACH(cpu) {
+        cpu_breakpoint_insert(cpu, pc, BP_GDB, NULL);
+    }
+}
+
+int libafl_snapshot_save( const char* name )
+{
+    Error *err = NULL;
+    save_snapshot(name, true, NULL, false, NULL, &err);
+    return err == 0;
+}
+
+int libafl_snapshot_load( const char* name )
+{
+    Error *err = NULL;
+    load_snapshot(name, NULL, false, NULL, &err);
+    return err == 0;
+}
+
+void libafl_phys_read(vaddr addr, uint8_t* buf, int len)
+{
+    cpu_physical_memory_read(addr, buf, len);
+}
+void libafl_phys_write(vaddr addr, uint8_t* buf, int len)
+{
+    cpu_physical_memory_write(addr, buf, len);
+}
+
+#ifndef AS_SHARED_LIB
 int main(int argc, char **argv, char **envp)
 {
-    qemu_init(argc, argv, envp);
+    // qemu_init(argc, argv, envp);
-    qemu_main_loop();
+    // qemu_main_loop();
-    qemu_cleanup();
+    // qemu_cleanup();
+    // 2000010c
+    unsigned char buf[4096] = {3};
+    libafl_qemu_sys_init(argc, argv, envp);
+    libafl_phys_write(0x00006de4+0xc, buf,1);
+    libafl_phys_read(0x00006de4+0xc, buf,1);
+    printf("FUZZ_INPUT[0]: %x\n", buf[0]);
+    libafl_qemu_set_breakpoint(0x00004f5c);
+    libafl_snapshot_save("Start");
+    do {
+        libafl_qemu_main_loop();
+        libafl_snapshot_load("Start");
+        puts("Reload has occured");
+    } while (runstate_check(RUN_STATE_DEBUG));
+    libafl_qemu_cleanup();
 
     return 0;
 }
+#endif
+
+/* End LibAFL instrumentation */

softmmu/runstate.c

@@ -668,6 +668,10 @@ static bool main_loop_should_exit(void)
 
     if (qemu_debug_requested()) {
         vm_stop(RUN_STATE_DEBUG);
+        /* Begin LibAFL instrumentation */
+        // main loop will exit back to fuzzer
+        return true;
+        /* End LibAFL instrumentation */
     }
     if (qemu_suspend_requested()) {
         qemu_system_suspend();

starter.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+if [ ! -f dummy.qcow2 ]; then
+	qemu-img create -f qcow2 dummy.qcow2 32M
+fi
+build/qemu-system-arm -machine mps2-an385 -monitor null -semihosting \
+        --semihosting-config enable=on,target=native \
+        -kernel $1 \
+        -serial stdio -nographic \
+	-snapshot -drive if=none,format=qcow2,file=dummy.qcow2 \
+        -S

tcg/tcg.c

@@ -566,6 +566,16 @@ static void process_op_defs(TCGContext *s);
 static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
                                             TCGReg reg, const char *name);
 
+//// --- Begin LibAFL code ---
+
+void libafl_helper_table_add(TCGHelperInfo* info);
+void libafl_helper_table_add(TCGHelperInfo* info) {
+    g_hash_table_insert(helper_table, (gpointer)info->func,
+                        (gpointer)info);
+}
+
+//// --- End LibAFL code ---
+
 static void tcg_context_init(unsigned max_cpus)
 {
     TCGContext *s = &tcg_init_ctx;