Merge pull request #336 from farmdve/tests

Add test for pre-instruction hook being invoked more times.

.gitignore

@@ -128,6 +128,7 @@ mips_branch_likely_issue
 test_mem_map_ptr
 test_mem_high
 rw_hookstack
+hook_extrainvoke
 
 
 #################

tests/regress/Makefile

@@ -34,6 +34,7 @@ TESTS += rw_hookstack
 TESTS += threaded_emu_start
 TESTS += emu_stop_in_hook_overrun
 TESTS += mips_branch_likely_issue
+TESTS += hook_extrainvoke
 
 all: $(TESTS)
 

tests/regress/hook_extrainvoke.c

@@ -0,0 +1,94 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include <unicorn/unicorn.h>
+
+#define X86_CODE32 "\xf3\xab" // rep stosd dword ptr es:[edi], eax -> Fill (E)CX doublewords at ES:[(E)DI] with EAX
+#define ADDRESS 0x1000000
+#define ECX_OPS 2
+static long unsigned int hook_called = 0;
+
+void hook_ins(uc_engine *uc, uint64_t address, uint32_t size, void *user_data)
+{
+    hook_called++;
+    printf("hook called\n");
+}
+
+static void VM_exec()
+{
+    uc_engine *uc;
+    uc_err err;
+    uc_hook trace;
+    unsigned int r_eax, eflags, r_esp, r_edi, r_ecx;
+
+    r_eax = 0xbaadbabe;
+    r_esp = ADDRESS+0x20;
+    r_edi = ADDRESS+0x300; //some safe distance from main code.
+    eflags = 0x00000206;
+    r_ecx = ECX_OPS;
+
+    // Initialize emulator in X86-32bit mode
+    err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
+    if(err)
+    {
+        printf("Failed on uc_open() with error returned: %s\n", uc_strerror(err));
+        return;
+    }
+
+    err = uc_mem_map(uc, ADDRESS, (2 * 1024 * 1024), UC_PROT_ALL);
+    if(err != UC_ERR_OK)
+    {
+        printf("Failed to map memory %s\n", uc_strerror(err));
+        return;
+    }
+
+    // write machine code to be emulated to memory
+    err = uc_mem_write(uc, ADDRESS, X86_CODE32, sizeof(X86_CODE32) - 1);
+    if(err != UC_ERR_OK)
+    {
+        printf("Failed to write emulation code to memory, quit!: %s(len %lu)\n", uc_strerror(err), (unsigned long)sizeof(X86_CODE32) - 1);
+        return;
+    }
+
+    // initialize machine registers
+    uc_reg_write(uc, UC_X86_REG_EAX, &r_eax);
+    uc_reg_write(uc, UC_X86_REG_EDI, &r_edi);
+    uc_reg_write(uc, UC_X86_REG_ECX, &r_ecx);
+    uc_reg_write(uc, UC_X86_REG_ESP, &r_esp); //make stack pointer point to already mapped memory so we don't need to hook.
+    uc_reg_write(uc, UC_X86_REG_EFLAGS, &eflags);
+
+    uc_hook_add(uc, &trace, UC_HOOK_CODE, (void *)hook_ins, NULL, (uint64_t)1, (uint64_t)0);
+
+    // emulate machine code in infinite time
+    err = uc_emu_start(uc, ADDRESS, ADDRESS + (sizeof(X86_CODE32) - 1), 0, 0);
+    if(err)
+    {
+        printf("Failed on uc_emu_start() with error returned %u: %s\n", err, uc_strerror(err));
+
+        uc_close(uc);
+        return;
+    }
+
+    uc_reg_read(uc, UC_X86_REG_EAX, &r_eax);
+    uc_reg_read(uc, UC_X86_REG_ECX, &r_ecx);
+    uc_reg_read(uc, UC_X86_REG_EDI, &r_edi);
+    uc_reg_read(uc, UC_X86_REG_EFLAGS, &eflags);
+
+    uc_close(uc);
+
+    printf("\n>>> Emulation done. Below is the CPU context\n");
+    printf(">>> EAX = 0x%08X\n", r_eax);
+    printf(">>> ECX = 0x%08X\n", r_ecx);
+    printf(">>> EDI = 0x%08X\n", r_edi);
+    printf(">>> EFLAGS = 0x%08X\n", eflags);
+
+    printf("\nHook called %lu times. Test %s\n", hook_called, (hook_called == ECX_OPS ? "PASSED!!" : "FAILED!!!"));
+
+}
+
+int main(int argc, char *argv[])
+{
+    VM_exec();
+    return 0;
+}