File size: 2,077 Bytes
8739cbb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | --compiles some handy utilities into the target process you can call using c (or assembler if you so wish)
--add #include <celib.h> to your c-code
--
--functions:
--csEnter/csLeave: Low level criticial section implementation that does an active wait (more cpu intensive, but safe enough to use in an environment with no other API access)
function injectCEHelperLib()
if getAddressSafe('csenter')==nil then
local s
if targetIsX86() then
s=[[
alloc(cespinlock,32)
cespinlock:
]]
--write the code to bit test and set the locked variable
if targetIs64Bit() then
if getABI()==0 then --windows uses rcx as first param
s=s..[[
lock bts [rcx],0
]]
else
--rdi contains the first param
s=s..[[
lock bts [rdi],0
]]
end
else
--both use the push param method
s=s..[[
mov eax,[esp+4]
lock bts [eax],0
]]
end
s=s..[[
jc cespinlock_wait
ret
cespinlock_wait:
pause
jmp cespinlock
]]
else
error("todo: implement a spinlock for arm (could halfass it and just call and api)")
end
s=s..[[
{$c}
#include <celib.h>
extern void cespinlock(int *lock);
#ifdef _WIN32
extern int getCurrentThreadID();
#else
extern int gettid();
int getCurrentThreadID()
{
return gettid();
}
#endif
void csenter(cecs *cs)
{
if ((cs->locked) && (cs->threadid==getCurrentThreadID()))
{
cs->lockcount++;
return;
}
cespinlock(&cs->locked);
cs->threadid=getCurrentThreadID();
cs->lockcount++;
}
void csleave(cecs *cs)
{
cs->lockcount--;
if (cs->lockcount==0)
{
cs->threadid=0;
cs->locked=0;
}
}
{$asm}
]]
local r,r2=autoAssemble(s)
if r then
r2.ccodesymbols.name='CELib'
return r
else
return false, r2
end
else
return true
end
end |