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/***************************************************Project Mutator****************************************************/
/*first line intentionally left blank.*/
/*bruiser's libffi side for calling xobjects*/
/*Copyright (C) 2018 Farzad Sadeghi
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.*/
/**********************************************************************************************************************/
// @TODO-structs and unions not supported
// @TODO-vararg xobjs are not supported
/**********************************************************************************************************************/
#include <ffi.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
//#include <capstone/capstone.h>
#include "bruiserffi.h"
/**********************************************************************************************************************/
#define VOIDIFY(X) (void*)X
/**********************************************************************************************************************/
#pragma GCC diagnostic ignored "-Wpointer-to-int-cast"
#pragma GCC diagnostic push
#define REINTERPRET_GENERATOR(X) \
X ffi_reinterpret_##X(void* result) {return (X)result;}
#define X_LIST_GEN \
X(uint8_t, "for uint8_t")\
X(uint16_t, "for uint16_t")\
X(uint32_t, "for uint32_t")\
X(uint64_t, "for uint64_t")\
X(int8_t, "for int8_t")\
X(int16_t, "for int16_t")\
X(int32_t, "for int32_t")\
X(int64_t, "for int64_t")\
X(uintptr_t, "for pointers")\
#define X(X1,X2) REINTERPRET_GENERATOR(X1)
X_LIST_GEN
#undef X
#undef X_LIST_GEN
#undef REINTERPRET_GENERATOR
float ffi_reinterpret_float(void* result) {return *(float*)&result;}
double ffi_reinterpret_double(void* result) {return *(double*)&result;}
char* ffi_reinterpret_string(void* result) {return (char*)result;}
void ffi_value_ctor(void** ret, int argc, ...) {
va_list value_list;
char* arg_string;
uint16_t counter = 0U;
va_start(value_list, argc);
for (int i = 0; i < argc; ++i) {
arg_string = va_arg(value_list, char*);
if (strcmp(arg_string, "uint8") == 0) {
uint8_t* dummy = va_arg(value_list, uint8_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "sint8") == 0) {
int8_t* dummy = va_arg(value_list, int8_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "uint16") == 0) {
uint16_t* dummy = va_arg(value_list, uint16_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "sint16") == 0) {
int16_t* dummy = va_arg(value_list, int16_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "uint32") == 0) {
uint32_t* dummy = va_arg(value_list, uint32_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "sint32") == 0) {
int32_t* dummy = va_arg(value_list, int32_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "uint64") == 0) {
uint64_t* dummy = va_arg(value_list, uint64_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "sint64") == 0) {
int64_t* dummy = va_arg(value_list, int64_t*);
ret[counter] = VOIDIFY(dummy);
}
else if (strcmp(arg_string, "float") == 0) {
float* dummy = va_arg(value_list, float*);
ret[counter] = dummy;
}
else if (strcmp(arg_string, "double") == 0) {
double* dummy = va_arg(value_list, double*);
ret[counter] = dummy;
}
else if (strcmp(arg_string, "pointer") == 0) {
ret[counter] = va_arg(value_list, void*);
}
else {
ret[counter] = NULL;
fprintf(stderr, "got garbage arg value string...\n");
}
counter++;
}
}
ffi_type* ffi_type_ctor(const char* arg_string) {
if (strcmp(arg_string, "void") == 0) {return &ffi_type_void;}
else if (strcmp(arg_string, "uint8") == 0) {return &ffi_type_uint8;}
else if (strcmp(arg_string, "sint8") == 0) {return &ffi_type_sint8;}
else if (strcmp(arg_string, "uint16") == 0) {return &ffi_type_uint16;}
else if (strcmp(arg_string, "sint16") == 0) {return &ffi_type_sint16;}
else if (strcmp(arg_string, "uint32") == 0) {return &ffi_type_uint32;}
else if (strcmp(arg_string, "sint32") == 0) {return &ffi_type_sint32;}
else if (strcmp(arg_string, "uint64") == 0) {return &ffi_type_uint64;}
else if (strcmp(arg_string, "sint64") == 0) {return &ffi_type_sint64;}
else if (strcmp(arg_string, "float") == 0) {return &ffi_type_float;}
else if (strcmp(arg_string, "double") == 0) {return &ffi_type_double;}
else if (strcmp(arg_string, "pointer") == 0) {return &ffi_type_pointer;}
else if (strcmp(arg_string, "string") == 0) {return &ffi_type_pointer;}
// @DEVI-FIXME: currently we are not handling structs at all
else if (strcmp(arg_string, "struct") == 0) {return &ffi_type_pointer;}
else {
fprintf(stderr, "garbage arg type was passed.\n");
return NULL;
}
}
void* ffi_callX(int argc, const char** arg_string, ffi_type rtype, void* x_ptr, void** values) {
ffi_status status;
ffi_cif cif;
ffi_type* args_types[argc];
void* ret;
for (int i = 0; i < argc; ++i) {
if (ffi_type_ctor(arg_string[i])) args_types[i] = ffi_type_ctor(arg_string[i]);
}
status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, argc, &rtype, args_types);
if (status == FFI_BAD_TYPEDEF) {
fprintf(stderr, "ffi_prep_cif returned FFI_BAD_TYPEDEF: %d\n", status);
return NULL;
} else if (status == FFI_BAD_ABI) {
fprintf(stderr, "ffi_prep_cif returned FFI_BAD_ABI: %d\n", status);
return NULL;
} else if (status == FFI_OK) {
fprintf(stderr, "ffi_prep_cif returned FFI_OK: %d\n", status);
} else {
fprintf(stderr, "ffi_prep_cif returned an error: %d\n", status);
return NULL;
}
ffi_call(&cif, FFI_FN(x_ptr), &ret, values);
return ret;
}
void* ffi_callX_var(int argc, const char** arg_string, ffi_type rtype, void* x_ptr, void** values) {return NULL;}
/**********************************************************************************************************************/
/**********************************************************************************************************************/
// @DEVI-the following lines are only meant for testing.
uint32_t add2(uint32_t a, uint32_t b) {return a+b;}
uint32_t sub2(uint32_t a, uint32_t b) {return a-b;}
double addd(double a, double b) {return a+b;}
char* passthrough(char* a) {return a;}
#pragma weak main
int main(int argc, char** argv) {
void* padd = &add2;
void* psub = &sub2;
void* padd2 = &addd;
void* pstring = &passthrough;
int argcount = 2;
ffi_type ret_type = ffi_type_uint32;
const char* args[] = {"uint32", "uint32"};
const char* ret_string = "uint32";
uint32_t a = 30;
uint32_t b = 20;
void* values[2];
ffi_value_ctor(values, 2, "uint32", &a, "uint32", &b);
void* result = ffi_callX(argcount, args, ret_type, padd, values);
fprintf(stdout, "result of callling add is %d\n", (uint32_t)result);
result = ffi_callX(argcount, args, ret_type, psub, values);
fprintf(stdout, "result of calling sub is %d\n", (uint32_t)result);
ret_type = ffi_type_double;
double c = 111.111;
double d = 111.111;
const char* args2[] = {"double", "double"};
void* values2[] = {&c, &d};
result = ffi_callX(argcount, args2, ret_type, padd2, values2);
fprintf(stdout, "result of calling addd is %f\n", ffi_reinterpret_double(result));
const char* args3[] = {"string"};
char* dummy = "i live!";
void* values3[] = {&dummy};
result = ffi_callX(1, args3, ffi_type_pointer, pstring, values3);
fprintf(stdout, "result of calling passthrough is %s\n", ffi_reinterpret_string(result));
return 0;
}
/**********************************************************************************************************************/
/*last line intentionally left blank.*/
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