#include "x86_emulate.h"

#include <sys/mman.h>

#define cpu_has_amd_erratum(nr) 0
#define cpu_has_mpx false
#define read_bndcfgu() 0
#define xstate_set_init(what)

/* For generic assembly code: use macros to define operation/operand sizes. */
#ifdef __i386__
# define r(name)       e ## name
# define __OS          "l"  /* Operation Suffix */
# define __OP          "e"  /* Operand Prefix */
#else
# define r(name)       r ## name
# define __OS          "q"  /* Operation Suffix */
# define __OP          "r"  /* Operand Prefix */
#endif

#define get_stub(stb) ({                         \
    assert(!(stb).addr);                         \
    (void *)((stb).addr = (uintptr_t)(stb).buf); \
})
#define put_stub(stb) ((stb).addr = 0)

uint32_t mxcsr_mask = 0x0000ffbf;

bool emul_test_init(void)
{
    unsigned long sp;

    if ( cpu_has_fxsr )
    {
        static union __attribute__((__aligned__(16))) {
            char x[464];
            struct {
                uint32_t other[6];
                uint32_t mxcsr;
                uint32_t mxcsr_mask;
                /* ... */
            };
        } fxs;

        asm ( "fxsave %0" : "=m" (fxs) );
        if ( fxs.mxcsr_mask )
            mxcsr_mask = fxs.mxcsr_mask;
    }

    /*
     * Mark the entire stack executable so that the stub executions
     * don't fault
     */
#ifdef __x86_64__
    asm ("movq %%rsp, %0" : "=g" (sp));
#else
    asm ("movl %%esp, %0" : "=g" (sp));
#endif

    return mprotect((void *)(sp & -0x1000L) - (MMAP_SZ - 0x1000),
                    MMAP_SZ, PROT_READ|PROT_WRITE|PROT_EXEC) == 0;
}

int emul_test_cpuid(
    uint32_t leaf,
    uint32_t subleaf,
    struct cpuid_leaf *res,
    struct x86_emulate_ctxt *ctxt)
{
    asm ("cpuid"
         : "=a" (res->a), "=b" (res->b), "=c" (res->c), "=d" (res->d)
         : "a" (leaf), "c" (subleaf));

    /*
     * The emulator doesn't itself use MOVBE, so we can always run the
     * respective tests.
     */
    if ( leaf == 1 )
        res->c |= 1U << 22;

    /*
     * The emulator doesn't itself use ADCX/ADOX/RDPID, so we can always run
     * the respective tests.
     */
    if ( leaf == 7 && subleaf == 0 )
    {
        res->b |= 1U << 19;
        res->c |= 1U << 22;
    }

    /*
     * The emulator doesn't itself use CLZERO, so we can always run the
     * respective test(s).
     */
    if ( leaf == 0x80000008 )
        res->b |= 1U << 0;

    return X86EMUL_OKAY;
}

int emul_test_read_cr(
    unsigned int reg,
    unsigned long *val,
    struct x86_emulate_ctxt *ctxt)
{
    /* Fake just enough state for the emulator's _get_fpu() to be happy. */
    switch ( reg )
    {
    case 0:
        *val = 0x00000001; /* PE */
        return X86EMUL_OKAY;

    case 4:
        /* OSFXSR, OSXMMEXCPT, and maybe OSXSAVE */
        *val = 0x00000600 | (cpu_has_xsave ? 0x00040000 : 0);
        return X86EMUL_OKAY;
    }

    return X86EMUL_UNHANDLEABLE;
}

int emul_test_get_fpu(
    void (*exception_callback)(void *, struct cpu_user_regs *),
    void *exception_callback_arg,
    enum x86_emulate_fpu_type type,
    struct x86_emulate_ctxt *ctxt)
{
    switch ( type )
    {
    case X86EMUL_FPU_fpu:
        break;
    case X86EMUL_FPU_mmx:
        if ( cpu_has_mmx )
            break;
    case X86EMUL_FPU_xmm:
        if ( cpu_has_sse )
            break;
    case X86EMUL_FPU_ymm:
        if ( cpu_has_avx )
            break;
    default:
        return X86EMUL_UNHANDLEABLE;
    }
    return X86EMUL_OKAY;
}

void emul_test_put_fpu(
    struct x86_emulate_ctxt *ctxt,
    enum x86_emulate_fpu_type backout,
    const struct x86_emul_fpu_aux *aux)
{
    /* TBD */
}

#include "x86_emulate/x86_emulate.c"
