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x86_rt.c
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x86_rt.c
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#include "config.h"
#ifdef USE_MMAP_CODE_SEG
#include <sys/mman.h>
#endif
#include <string.h>
#include "dill.h"
#include "dill_internal.h"
#include "x86.h"
#include <string.h>
extern long dill_x86_hidden_mod(long a, long b)
{ return a % b; }
extern long dill_x86_hidden_umod(unsigned long a, unsigned long b)
{ return a % b; }
static xfer_entry x86_xfer_recs[3] = {
{"dill_x86_hidden_mod", dill_x86_hidden_mod},
{"dill_x86_hidden_umod", dill_x86_hidden_umod},
{(char*)0, (void*)0}};
extern void
x86_rt_call_link(char *code, call_t *t)
{
int i;
for(i=0; i< t->call_count; i++) {
int *call_addr = (int*) (code + t->call_locs[i].loc + 1);
int call_offset = (int)(((char*)t->call_locs[i].xfer_addr) -
((char*)call_addr + 4)); /* add len of call insn */
*call_addr = call_offset;
}
}
extern char *
x86_package_stitch(char *code, call_t *t, dill_pkg pkg)
{
char *tmp = code;
dill_lookup_xfer_addrs(t, &x86_xfer_recs[0]);
x86_rt_call_link(code, t);
#ifdef USE_MMAP_CODE_SEG
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
tmp = (void*)mmap(0, pkg->code_size,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
memcpy(tmp, code, pkg->code_size);
#endif
return tmp + pkg->entry_offset;
}