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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <pthread.h>
//#include "custommem.h"
#include "bridge.h"
#include "bridge_private.h"
#include "khash.h"
#include "debug.h"
#include "x64emu.h"
#ifdef DYNAREC
#include "dynablock.h"
#include "box64context.h"
#endif
KHASH_MAP_INIT_INT64(bridgemap, uintptr_t)
//onebridge is 32 bytes
#define NBRICK 4096/32
typedef struct brick_s brick_t;
typedef struct brick_s {
onebridge_t *b;
int sz;
brick_t *next;
} brick_t;
typedef struct bridge_s {
brick_t *head;
brick_t *last; // to speed up
pthread_mutex_t mutex;
kh_bridgemap_t *bridgemap;
} bridge_t;
brick_t* NewBrick()
{
brick_t* ret = (brick_t*)calloc(1, sizeof(brick_t));
posix_memalign((void**)&ret->b, box64_pagesize, NBRICK*sizeof(onebridge_t));
return ret;
}
bridge_t *NewBridge()
{
bridge_t *b = (bridge_t*)calloc(1, sizeof(bridge_t));
b->head = NewBrick();
b->last = b->head;
pthread_mutex_init(&b->mutex, NULL);
b->bridgemap = kh_init(bridgemap);
return b;
}
void FreeBridge(bridge_t** bridge)
{
brick_t *b = (*bridge)->head;
while(b) {
brick_t *n = b->next;
#ifdef DYNAREC
if(getProtection((uintptr_t)b->b)&PROT_DYNAREC)
unprotectDB((uintptr_t)b->b, NBRICK*sizeof(onebridge_t));
#endif
free(b->b);
free(b);
b = n;
}
kh_destroy(bridgemap, (*bridge)->bridgemap);
pthread_mutex_destroy(&(*bridge)->mutex);
free(*bridge);
*bridge = NULL;
}
uintptr_t AddBridge(bridge_t* bridge, wrapper_t w, void* fnc, int N)
{
pthread_mutex_lock(&bridge->mutex);
brick_t *b = bridge->last;
if(b->sz == NBRICK) {
b->next = NewBrick();
b = b->next;
bridge->last = b;
}
#ifdef DYNAREC
int prot = 0;
if(box64_dynarec) {
prot=(getProtection((uintptr_t)b->b)&PROT_DYNAREC)?1:0;
if(prot)
unprotectDB((uintptr_t)b->b, NBRICK*sizeof(onebridge_t));
addDBFromAddressRange((uintptr_t)&b->b[b->sz].CC, sizeof(onebridge_t));
}
#endif
b->b[b->sz].CC = 0xCC;
b->b[b->sz].S = 'S'; b->b[b->sz].C='C';
b->b[b->sz].w = w;
b->b[b->sz].f = (uintptr_t)fnc;
b->b[b->sz].C3 = N?0xC2:0xC3;
b->b[b->sz].N = N;
#ifdef DYNAREC
if(box64_dynarec && prot)
protectDB((uintptr_t)b->b, NBRICK*sizeof(onebridge_t));
#endif
// add bridge to map, for fast recovery
int ret;
khint_t k = kh_put(bridgemap, bridge->bridgemap, (uintptr_t)fnc, &ret);
kh_value(bridge->bridgemap, k) = (uintptr_t)&b->b[b->sz].CC;
pthread_mutex_unlock(&bridge->mutex);
return (uintptr_t)&b->b[b->sz++].CC;
}
uintptr_t CheckBridged(bridge_t* bridge, void* fnc)
{
// check if function alread have a bridge (the function wrapper will not be tested)
khint_t k = kh_get(bridgemap, bridge->bridgemap, (uintptr_t)fnc);
if(k==kh_end(bridge->bridgemap))
return 0;
return kh_value(bridge->bridgemap, k);
}
uintptr_t AddCheckBridge(bridge_t* bridge, wrapper_t w, void* fnc, int N)
{
if(!fnc && w)
return 0;
uintptr_t ret = CheckBridged(bridge, fnc);
if(!ret)
ret = AddBridge(bridge, w, fnc, N);
return ret;
}
uintptr_t AddAutomaticBridge(x64emu_t* emu, bridge_t* bridge, wrapper_t w, void* fnc, int N)
{
if(!fnc)
return 0;
uintptr_t ret = CheckBridged(bridge, fnc);
if(!ret)
ret = AddBridge(bridge, w, fnc, N);
if(!hasAlternate(fnc)) {
printf_log(LOG_DEBUG, "Adding AutomaticBridge for %p to %p\n", fnc, (void*)ret);
addAlternate(fnc, (void*)ret);
#ifdef DYNAREC
// now, check if dynablock at native address exist
DBAlternateBlock(emu, (uintptr_t)fnc, ret);
#endif
}
return ret;
}
void* GetNativeFnc(uintptr_t fnc)
{
if(!fnc) return NULL;
// check if function exist in some loaded lib
Dl_info info;
if(dladdr((void*)fnc, &info))
return (void*)fnc;
// check if it's an indirect jump
#define PK(a) *(uint8_t*)(fnc+a)
#define PK32(a) *(uint32_t*)(fnc+a)
if(PK(0)==0xff && PK(1)==0x25) { // absolute jump, maybe the GOT
uintptr_t a1 = (PK32(2)); // need to add a check to see if the address is from the GOT !
a1 = *(uintptr_t*)a1;
if(a1 && a1>0x10000) {
a1 = (uintptr_t)GetNativeFnc(a1);
if(a1)
return (void*)a1;
}
}
#undef PK
#undef PK32
// check if bridge exist
onebridge_t *b = (onebridge_t*)fnc;
if(b->CC != 0xCC || b->S!='S' || b->C!='C' || (b->C3!=0xC3 && b->C3!=0xC2))
return NULL; // not a bridge?!
return (void*)b->f;
}
void* GetNativeFncOrFnc(uintptr_t fnc)
{
onebridge_t *b = (onebridge_t*)fnc;
if(b->CC != 0xCC || b->S!='S' || b->C!='C' || (b->C3!=0xC3 && b->C3!=0xC2))
return (void*)fnc; // not a bridge?!
return (void*)b->f;
}
// Alternate address handling
KHASH_MAP_INIT_INT64(alternate, void*)
static kh_alternate_t *my_alternates = NULL;
int hasAlternate(void* addr) {
if(!my_alternates)
return 0;
khint_t k = kh_get(alternate, my_alternates, (uintptr_t)addr);
if(k==kh_end(my_alternates))
return 0;
return 1;
}
void* getAlternate(void* addr) {
if(!my_alternates)
return addr;
khint_t k = kh_get(alternate, my_alternates, (uintptr_t)addr);
if(k!=kh_end(my_alternates))
return kh_value(my_alternates, k);
return addr;
}
void addAlternate(void* addr, void* alt) {
if(!my_alternates) {
my_alternates = kh_init(alternate);
}
int ret;
khint_t k = kh_put(alternate, my_alternates, (uintptr_t)addr, &ret);
if(!ret) // already there
return;
kh_value(my_alternates, k) = alt;
}
void cleanAlternate() {
if(my_alternates) {
kh_destroy(alternate, my_alternates);
my_alternates = NULL;
}
}
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