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Map bricks below first 2GB of address space #132

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merged 3 commits into from
Oct 13, 2021
Merged

Map bricks below first 2GB of address space #132

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0c27b82
Map bricks below first 2GB of address space
mogery Oct 12, 2021
4ca58d1
Fix incorrect brick cleanup
mogery Oct 12, 2021
bcb0bde
Declare my_mmap and my_munmap to avoid warning
mogery Oct 13, 2021
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13 changes: 11 additions & 2 deletions src/tools/bridge.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,9 @@
#include <string.h>
#include <dlfcn.h>
#include <pthread.h>
#include <sys/mman.h>

#include <wrappedlibs.h>
#include "custommem.h"
#include "bridge.h"
#include "bridge_private.h"
Expand Down Expand Up @@ -33,12 +35,18 @@ typedef struct bridge_s {
kh_bridgemap_t *bridgemap;
} bridge_t;

// from src/wrapped/wrappedlibc.c
void* my_mmap(x64emu_t* emu, void* addr, unsigned long length, int prot, int flags, int fd, int64_t offset);
int my_munmap(x64emu_t* emu, void* addr, unsigned long length);

brick_t* NewBrick()
{
brick_t* ret = (brick_t*)calloc(1, sizeof(brick_t));
if(posix_memalign((void**)&ret->b, box64_pagesize, NBRICK*sizeof(onebridge_t))) {
void* ptr = my_mmap(thread_get_emu(), NULL, NBRICK * sizeof(onebridge_t), PROT_READ | PROT_WRITE, MAP_PRIVATE | 0x40 | MAP_ANONYMOUS, -1, 0); // 0x40 is MAP_32BIT
if(ptr == MAP_FAILED) {
printf_log(LOG_NONE, "Warning, cannot allocate 0x%lx aligned bytes for bridge, will probably crash later\n", NBRICK*sizeof(onebridge_t));
}
ret->b = ptr;
return ret;
}

Expand All @@ -56,13 +64,14 @@ void FreeBridge(bridge_t** bridge)
if(!bridge || !*bridge)
return;
brick_t *b = (*bridge)->head;
x64emu_t* emu = thread_get_emu();
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);
my_munmap(emu, b->b, NBRICK*sizeof(onebridge_t));
free(b);
b = n;
}
Expand Down