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Force stack align for callbacks

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This commit is contained in:
asmodai 2017-02-08 00:49:20 +03:00
parent bcb6bd1af5
commit 08b965e485
1 changed files with 11 additions and 8 deletions
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19
metamod/src/callback_jit.cpp
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@ -51,6 +51,7 @@ void CForwardCallbackJIT::naked_main()
push(ebp);
mov(ebp, esp);
push(ebx);
and_(esp, 0xFFFFFFF0);
enum // stack map
{
@ -58,22 +59,27 @@ void CForwardCallbackJIT::naked_main()
over_ret = 4
};
auto align = [](size_t v, size_t a)
{
return (v + a - 1) & ~a;
};
auto globals = ebx;
auto mg_backup = m_jitdata->has_ret ? 8 /* orig + over */ : 0;
auto framesize = mg_backup + sizeof(meta_globals_t);
auto framesize = align(mg_backup + sizeof(meta_globals_t) + m_jitdata->args_count * sizeof(int), 16) - m_jitdata->args_count * sizeof(int);
if (m_jitdata->has_varargs) {
size_t buf_offset = framesize;
sub(esp, framesize += MAX_STRBUF_LEN);
sub(esp, framesize += align(MAX_STRBUF_LEN, 16));
// format varargs
lea(edx, dword_ptr[ebp + 8 + m_jitdata->args_count * 4]); // varargs ptr
lea(edx, dword_ptr[ebp + 8 + m_jitdata->args_count * sizeof(int)]); // varargs ptr
lea(eax, dword_ptr[esp + buf_offset]); // buf ptr
mov(ecx, size_t(vsnprintf));
push(edx);
push(dword_ptr[ebp + 8 + (m_jitdata->args_count - 1) * 4]); // last arg of pfn (format string)
push(dword_ptr[ebp + 8 + (m_jitdata->args_count - 1) * sizeof(int)]); // last arg of pfn (format string)
push(MAX_STRBUF_LEN);
push(eax);
call(ecx);
@ -254,12 +260,9 @@ void CForwardCallbackJIT::naked_main()
cmovz(eax, dword_ptr[esp + over_ret]);
}
if (framesize) {
add(esp, framesize);
}
// epilogue
pop(ebx);
mov(esp, ebp);
pop(ebp);
ret();
}