callvirtualfunction.cxx

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#include <sal/config.h>
 
#include <cstring>
 
#include <sal/types.h>
#include <sal/alloca.h>
 
#include "callvirtualfunction.hxx"
 
void callVirtualFunction(
    unsigned long function, unsigned long * gpr, unsigned long * fpr,
    unsigned long * stack, sal_Int32 sp, void * ret)
{
    void * stackargs;
    if (sp != 0) {
        stackargs = alloca(((sp + 1) >> 1) * 16);
        std::memcpy(stackargs, stack, sp * 8);
    }
    asm volatile(
        "ldp x0, x1, [%[gpr_]]\n\t"
        "ldp x2, x3, [%[gpr_], #16]\n\t"
        "ldp x4, x5, [%[gpr_], #32]\n\t"
        "ldp x6, x7, [%[gpr_], #48]\n\t"
        "ldr x8, %[ret_]\n\t"
        "ldr x9, %[function_]\n\t"
        "ldp d0, d1, [%[fpr_]]\n\t"
        "ldp d2, d3, [%[fpr_], #16]\n\t"
        "ldp d4, d5, [%[fpr_], #32]\n\t"
        "ldp d6, d7, [%[fpr_], #48]\n\t"
        "blr x9\n\t"
        "stp x0, x1, [%[gpr_]]\n\t"
        "stp d0, d1, [%[fpr_]]\n\t"
        "stp d2, d3, [%[fpr_], #16]\n\t"
        :: [gpr_]"r" (gpr), [fpr_]"r" (fpr), [function_]"m" (function),
           [ret_]"m" (ret),
           "m" (stackargs) // dummy input to prevent optimizing the alloca away
        : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
          "r11", "r12", "r13", "r14", "r15", "r16", "r17",
#if !defined ANDROID && !defined MACOSX
          "r18"/*TODO?*/,
#endif
          "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11",
          "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21",
          "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",
          "memory"
          // only the bottom 64 bits of v8--15 need to be preserved by callees
    );
}
 
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