/*
 * Copyright 2002-2012 Haiku, Inc. All Rights Reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef _ARCH_X86_SIGNAL_H_
#define _ARCH_X86_SIGNAL_H_


/*
 * Architecture-specific structure passed to signal handlers
 */

#if __i386__

typedef struct packed_fp_stack {
        unsigned char   st0[10];
        unsigned char   st1[10];
        unsigned char   st2[10];
        unsigned char   st3[10];
        unsigned char   st4[10];
        unsigned char   st5[10];
        unsigned char   st6[10];
        unsigned char   st7[10];
} packed_fp_stack;

typedef struct packed_mmx_regs {
        unsigned char   mm0[10];
        unsigned char   mm1[10];
        unsigned char   mm2[10];
        unsigned char   mm3[10];
        unsigned char   mm4[10];
        unsigned char   mm5[10];
        unsigned char   mm6[10];
        unsigned char   mm7[10];
} packed_mmx_regs;

// The layout of this structure matches the one used by the FSAVE/FNSAVE instruction, so the
// context can be loaded directly in the FPU if that instruction is available.
typedef struct old_extended_regs {
        unsigned short  fp_control;
        unsigned short  _reserved1;
        unsigned short  fp_status;
        unsigned short  _reserved2;
        unsigned short  fp_tag;
        unsigned short  _reserved3;
        unsigned long   fp_eip;
        unsigned short  fp_cs;
        unsigned short  fp_opcode;
        unsigned long   fp_datap;
        unsigned short  fp_ds;
        unsigned short  _reserved4;
        union {
                packed_fp_stack fp;
                packed_mmx_regs mmx;
        } fp_mmx;
} old_extended_regs;

typedef struct fp_stack {
        unsigned char   st0[10];
        unsigned char   _reserved_42_47[6];
        unsigned char   st1[10];
        unsigned char   _reserved_58_63[6];
        unsigned char   st2[10];
        unsigned char   _reserved_74_79[6];
        unsigned char   st3[10];
        unsigned char   _reserved_90_95[6];
        unsigned char   st4[10];
        unsigned char   _reserved_106_111[6];
        unsigned char   st5[10];
        unsigned char   _reserved_122_127[6];
        unsigned char   st6[10];
        unsigned char   _reserved_138_143[6];
        unsigned char   st7[10];
        unsigned char   _reserved_154_159[6];
} fp_stack;

typedef struct mmx_regs {
        unsigned char   mm0[10];
        unsigned char   _reserved_42_47[6];
        unsigned char   mm1[10];
        unsigned char   _reserved_58_63[6];
        unsigned char   mm2[10];
        unsigned char   _reserved_74_79[6];
        unsigned char   mm3[10];
        unsigned char   _reserved_90_95[6];
        unsigned char   mm4[10];
        unsigned char   _reserved_106_111[6];
        unsigned char   mm5[10];
        unsigned char   _reserved_122_127[6];
        unsigned char   mm6[10];
        unsigned char   _reserved_138_143[6];
        unsigned char   mm7[10];
        unsigned char   _reserved_154_159[6];
} mmx_regs;

typedef struct xmmx_regs {
        unsigned char   xmm0[16];
        unsigned char   xmm1[16];
        unsigned char   xmm2[16];
        unsigned char   xmm3[16];
        unsigned char   xmm4[16];
        unsigned char   xmm5[16];
        unsigned char   xmm6[16];
        unsigned char   xmm7[16];
} xmmx_regs;

// The layout matches the one used by the FXSAVE instruction, so that the context can be loaded
// quickly into the FPU using that.
typedef struct new_extended_regs {
        unsigned short  fp_control;
        unsigned short  fp_status;
        unsigned short  fp_tag;
        unsigned short  fp_opcode;
        unsigned long   fp_eip;
        unsigned short  fp_cs;
        unsigned short  res_14_15;
        unsigned long   fp_datap;
        unsigned short  fp_ds;
        unsigned short  _reserved_22_23;
        unsigned long   mxcsr;
        unsigned long   mxcsr_mask;
        union {
                fp_stack fp;
                mmx_regs mmx;
        } fp_mmx;
        xmmx_regs xmmx;
        unsigned char   _reserved_288_463[176];

        // This area is explicitly not read and written by the XSAVE and FXSAVE instructions
        // according to Intel documentation. Which is good news, because we have a few more things
        // of our own to store...

        unsigned long           fault_address;
        unsigned long           error_code;
        unsigned short          cs;
        unsigned short          ds;
        unsigned short          es;
        unsigned short          fs;
        unsigned short          gs;
        unsigned short          ss;
        unsigned char           trap_number;

        unsigned char   _available_485_511[27];
} new_extended_regs;

typedef struct extended_regs {
        union {
                old_extended_regs       old_format;
                new_extended_regs       new_format;
        } state;
        unsigned long   format;
} extended_regs;

struct vregs {
        unsigned long                   eip;
        unsigned long                   eflags;
        unsigned long                   eax;
        unsigned long                   ecx;
        unsigned long                   edx;
        unsigned long                   esp;
        unsigned long                   ebp;
        unsigned long                   _reserved_1;
        extended_regs   xregs;
        unsigned long                   edi;
        unsigned long                   esi;
        unsigned long                   ebx;
};

#endif /* __i386__ */

#endif /* _ARCH_X86_SIGNAL_H_ */