fpu.h

Go to the documentation of this file.

#pragma once
 
#include "stdint.h"
 
typedef struct env87 {
    long en_cw;
    long en_sw;
    long en_tw;
    long en_fip;
    unsigned short en_fcs;
    unsigned short en_opcode;
    long en_foo;
    long en_fos;
} env87;
 
typedef struct fpacc87 {
    unsigned char fp_bytes[10];
} fpacc87;
 
typedef struct save87 {
    env87 sv_env;
    fpacc87 sv_ac[8];
    unsigned char sv_pad0[4];
    /*
     * Bogus padding for emulators. Emulators should use their own
     * struct and arrange to store into this struct (ending here)
     * before it is inspected for ptracing or for core dumps. Some
     * emulators overwrite the whole struct. We have no good way of
     * knowing how much padding to leave. Leave just enough for the
     * GPL emulator's i387_union (176 bytes total).
     */
    unsigned char sv_pad[64];
} save87;
 
typedef struct envxmm {
    uint16_t en_cw;
    uint16_t en_sw;
    uint16_t en_tw;
    uint16_t en_opcode;
    uint32_t en_fip;
    uint16_t en_fcs;
    uint16_t en_pad0;
    uint32_t en_foo;
    uint16_t en_fos;
    uint16_t en_pad1;
    uint32_t en_mxcsr;
    uint32_t en_mxcsr_mask;
} envxmm;
 
typedef struct xmmacc {
    unsigned char xmm_bytes[16];
} xmmacc;
 
typedef struct savexmm {
    envxmm sv_env;
    struct {
        fpacc87 fp_acc;
        unsigned char fp_pad[6];
    } sv_fp[8];
    xmmacc sv_xmm[8];
    unsigned char sv_pad[224];
} __attribute__((__aligned__(16))) savexmm;
 
typedef union savefpu {
    save87 sv_87;
    savexmm sv_xmm;
} savefpu;
 
void switch_fpu(void);
 
void unswitch_fpu(void);
 
int fpu_install(void);