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feat: Relocation::write_func #31

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merged 2 commits into from
Nov 15, 2024
Merged

feat: Relocation::write_func #31

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dd664ad
feat: Relocation::write_func
shad0wshayd3 Nov 15, 2024
327cd15
maintenance
shad0wshayd3 Nov 15, 2024
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10 changes: 10 additions & 0 deletions CommonLibF4/include/REL/Relocation.h
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Original file line number Diff line number Diff line change
Expand Up @@ -329,6 +329,16 @@ namespace REL
safe_fill(address(), a_value, a_count);
}

#ifdef F4SE_SUPPORT_XBYAK
void write_func(const std::size_t a_count, const std::uintptr_t a_dst) requires(std::same_as<value_type, std::uintptr_t>);

template <class F>
void write_func(const std::size_t a_count, const F a_dst) requires(std::same_as<value_type, std::uintptr_t>)
{
write_func(a_count, stl::unrestricted_cast<std::uintptr_t>(a_dst));
}
#endif

template <class U = value_type>
std::uintptr_t write_vfunc(std::size_t a_idx, std::uintptr_t a_newFunc) requires(std::same_as<U, std::uintptr_t>)
{
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30 changes: 30 additions & 0 deletions CommonLibF4/src/REL/Relocation.cpp
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Expand Up @@ -32,3 +32,33 @@ namespace REL
assert(success);
}
}

#ifdef F4SE_SUPPORT_XBYAK
# include <xbyak/xbyak.h>

namespace REL
{
struct write_func_impl : Xbyak::CodeGenerator
{
write_func_impl(std::uintptr_t a_dst)
{
Xbyak::Label dst;
jmp(ptr[rip + dst]);
L(dst);
dq(a_dst);
}
};

template <class T>
void Relocation<T>::write_func(const std::size_t a_count, const std::uintptr_t a_dst) requires(std::same_as<value_type, std::uintptr_t>)
{
safe_fill(address(), INT3, a_count);
auto patch = write_func_impl{ a_dst };
patch.ready();
assert(patch.getSize() <= a_count);
safe_write(address(), std::span{ patch.getCode<const std::byte*>(), patch.getSize() });
}

template void Relocation<std::uintptr_t>::write_func(const std::size_t, const std::uintptr_t);
}
#endif
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