support memory redirection, so the issue #217 is fixed

include/uc_priv.h

@@ -54,6 +54,9 @@ typedef void (*uc_readonly_mem_t)(MemoryRegion *mr, bool readonly);
 // which interrupt should make emulation stop?
 typedef bool (*uc_args_int_t)(int intno);
 
+// some architecture redirect virtual memory to physical memory like Mips
+typedef uint64_t (*uc_mem_redirect_t)(uint64_t address);
+
 
 struct hook_struct {
     int hook_type; // uc_tracecode_type & uc_tracemem_type
@@ -94,6 +97,7 @@ struct uc_struct {
     uc_args_uc_ram_size_t memory_map;
     uc_mem_unmap_t memory_unmap;
     uc_readonly_mem_t readonly_mem;
+    uc_mem_redirect_t mem_redirect;
     // list of cpu
     void* cpu;
 

qemu/target-mips/unicorn.c

@@ -17,6 +17,21 @@
 #define READ_BYTE_L(x) (x & 0xff)
 
 
+static uint64_t mips_mem_redirect(uint64_t address)
+{
+    // kseg0 range masks off high address bit
+    if (address >= 0x80000000 && address <= 0x9fffffff)
+        return address & 0x7fffffff;
+
+    // kseg1 range masks off top 3 address bits
+    if (address >= 0xa0000000 && address <= 0xbfffffff) {
+        return address & 0x1fffffff;
+    }
+
+    // no redirect
+    return address;
+}
+
 static void mips_set_pc(struct uc_struct *uc, uint64_t address)
 {
     ((CPUMIPSState *)uc->current_cpu->env_ptr)->active_tc.PC = address;
@@ -96,5 +111,6 @@ __attribute__ ((visibility ("default")))
     uc->reg_write = mips_reg_write;
     uc->reg_reset = mips_reg_reset;
     uc->set_pc = mips_set_pc;
+    uc->mem_redirect = mips_mem_redirect;
     uc_common_init(uc);
 }

tests/regress/mips_kseg0_1.c

@@ -69,5 +69,7 @@ int main()
 
     uc_close(uc);
 
+    printf("Good, this bug is fixed!\n");
+
     return 0;
 }

uc.c

@@ -811,6 +811,10 @@ MemoryRegion *memory_mapping(struct uc_struct* uc, uint64_t address)
     if (uc->mapped_block_count == 0)
         return NULL;
 
+    if (uc->mem_redirect) {
+        address = uc->mem_redirect(address);
+    }
+
     // try with the cache index first
     i = uc->mapped_block_cache_index;