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Ruby: Support reading and writing x86 FPU stack registers (#892) 

In order to reduce rounding problems from calculations, FPU stack
registers for x86 architectures contain values stored in an
80-bit extended precision format.

As a result, reading and writing to these registers requires
specific handling.

This update brings the Ruby bindings in line with the Python
bindings by supporting reading and writing the FPU stack registers
using 2-element arrays: [mantissa, exponent]

The mantissa array element contains the first 64 bits of the FPU
stack register.

The exponent array element contains the last 16 bits of the FPU
stack register.
This commit is contained in:
fallenoak 2017-09-17 10:44:30 -05:00 committed by Nguyen Anh Quynh
parent f0229bd144
commit 46ae3a042e
3 changed files with 74 additions and 1 deletions
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25
bindings/ruby/unicorn_gem/ext/types.h Normal file
View File

@ -0,0 +1,25 @@
/*
Ruby bindings for the Unicorn Emulator Engine
Copyright(c) 2016 Sascha Schirra
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
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.
*/
typedef struct uc_x86_float80 {
uint64_t mantissa;
uint16_t exponent;
} uc_x86_float80;

48
bindings/ruby/unicorn_gem/ext/unicorn.c
View File

@ -22,6 +22,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include <unicorn/unicorn.h>
#include <unicorn/x86.h>
#include "unicorn.h"
#include "types.h"
VALUE UnicornModule = Qnil;
VALUE UcClass = Qnil;
@ -118,6 +119,7 @@ VALUE m_uc_reg_read(VALUE self, VALUE reg_id){
int64_t reg_value = 0;
VALUE to_ret;
uc_x86_mmr mmr;
uc_x86_float80 float80;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
@ -147,6 +149,30 @@ VALUE m_uc_reg_read(VALUE self, VALUE reg_id){
rb_ary_store(mmr_ary, 2, UINT2NUM(mmr.limit));
rb_ary_store(mmr_ary, 3, UINT2NUM(mmr.flags));
return mmr_ary;
case UC_X86_REG_FP0:
case UC_X86_REG_FP1:
case UC_X86_REG_FP2:
case UC_X86_REG_FP3:
case UC_X86_REG_FP4:
case UC_X86_REG_FP5:
case UC_X86_REG_FP6:
case UC_X86_REG_FP7:
float80.mantissa = 0;
float80.exponent = 0;
err = uc_reg_read(_uc, tmp_reg, &float80);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE float80_ary = rb_ary_new();
rb_ary_store(float80_ary, 0, ULL2NUM(float80.mantissa));
rb_ary_store(float80_ary, 1, UINT2NUM(float80.exponent));
return float80_ary;
}
}
if(arch == UC_ARCH_ARM64) {
@ -177,6 +203,7 @@ VALUE m_uc_reg_write(VALUE self, VALUE reg_id, VALUE reg_value){
uc_err err;
int32_t tmp_reg = NUM2INT(reg_id);
uc_x86_mmr mmr;
uc_x86_float80 float80;
int64_t tmp;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
@ -201,6 +228,27 @@ VALUE m_uc_reg_write(VALUE self, VALUE reg_id, VALUE reg_value){
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
case UC_X86_REG_FP0:
case UC_X86_REG_FP1:
case UC_X86_REG_FP2:
case UC_X86_REG_FP3:
case UC_X86_REG_FP4:
case UC_X86_REG_FP5:
case UC_X86_REG_FP6:
case UC_X86_REG_FP7:
Check_Type(reg_value, T_ARRAY);
float80.mantissa = NUM2ULL(rb_ary_entry(reg_value,0));
float80.exponent = NUM2USHORT(rb_ary_entry(reg_value,1));
err = uc_reg_write(_uc, tmp_reg, &float80);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
}
if(arch == UC_ARCH_ARM64) {

2
bindings/ruby/unicorn_gem/unicorn.gemspec
View File

@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
spec.description = %q{Ruby binding for Unicorn-Engine <unicorn-engine.org>}
spec.homepage = "https://unicorn-engine.org"
spec.files = Dir["lib/unicorn/*.rb"] + Dir["ext/unicorn.c"] + Dir["ext/unicorn.h"] + Dir["ext/extconf.rb"]
spec.files = Dir["lib/unicorn/*.rb"] + Dir["ext/unicorn.c"] + Dir["ext/unicorn.h"] + Dir["ext/types.h"] + Dir["ext/extconf.rb"]
spec.require_paths = ["lib","ext"]
spec.extensions = ["ext/extconf.rb"]
spec.add_development_dependency "bundler", "~> 1.11"