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https://github.com/mkxp-z/mkxp-z.git
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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
#include "miniffi.h"
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#include <assert.h>
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#if defined(__linux__) || defined(__APPLE__)
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mffi_value miniffi_call_intern(MINIFFI_FUNC target, MiniFFIFuncArgs *p, int nparams) {
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assert(nparams <= 8);
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return target(p->params[0], p->params[1], p->params[2], p->params[3],
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p->params[4], p->params[5], p->params[6], p->params[7]);
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}
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#else
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#define INTEL_ASM ".intel_syntax noprefix\n"
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__attribute__((noinline))
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#ifndef __MINGW64__
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mffi_value miniffi_call_intern(MINIFFI_FUNC target, MiniFFIFuncArgs *p, int nparams) {
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mffi_value ret;
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void *old_esp = 0;
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asm volatile(INTEL_ASM
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"mov [edi], esp\n"
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"test ebx, ebx\n"
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"jz mffi_call_void\n"
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"shl ebx, 2\n"
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"mov ecx, ebx\n"
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"mffi_call_loop:\n"
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"sub ecx, 4\n"
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"mov ebx, [esi+ecx]\n"
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"push ebx\n"
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"test ecx, ecx\n"
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"jnz mffi_call_loop\n"
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"mffi_call_void:\n"
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"call edx\n"
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: "=a"(ret)
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: "b"(nparams), "S"(p), "d"(target), "D"(&old_esp)
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: "ecx"
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);
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// If esp doesn't match, this was probably a cdecl and not a stdcall.
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// Move the stack pointer back to where it should be
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asm volatile(INTEL_ASM
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"mov edx, [edi]\n"
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"cmp edx, esp\n"
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"cmovne esp, edx"
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:
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: "D"(&old_esp)
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: "edx"
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);
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return ret;
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}
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#else
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mffi_value miniffi_call_intern(MINIFFI_FUNC target, MiniFFIFuncArgs *p, int nparams) {
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mffi_value ret;
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asm volatile(INTEL_ASM
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"test rax, rax\n"
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"jz mffi_call_void\n"
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"cmp rax, 4\n"
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"jle mffi_call_low\n"
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"shl rax, 3\n"
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"mffi_call_loop:\n"
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"sub rax, 8\n"
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"mov rbx, [rsi+rax]\n"
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"push rbx\n"
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"cmp rax, 32\n"
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"jg mffi_call_loop\n"
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"mffi_call_low:\n"
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"mov rcx, [rsi]\n"
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"mov rdx, [rsi+8]\n"
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"mov r8, [rsi+16]\n"
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"mov r9, [rsi+24]\n"
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"mffi_call_void:\n"
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"call rdi\n"
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: "=a"(ret)
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: "a"(nparams), "S"(p), "D"(target)
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: "r8", "r9", "rbx", "rcx", "rdx"
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);
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return ret;
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}
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#endif
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#endif
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