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// Usage: EFLAGS(ctx)->SF = 1;

// The above would set the sign flag for CONTEXT variable, ctx, to 1 (The only two valid options being 0 or 1).

 

typedef union {

        DWORD flags;

        struct {

                unsigned CF : 1;

                unsigned reserved1 : 1;

                unsigned PF : 1;

                unsigned reserved2 : 1;

                unsigned AF : 1;

                unsigned reserved3 : 1;

                unsigned ZF : 1;

                unsigned SF : 1;

                unsigned TF : 1;

                unsigned IF : 1;

                unsigned DF : 1;

                unsigned OF : 1;

        };

} EFLAGS;

 

#define EFLAGS(ctx) (reinterpret_cast<EFLAGS *>(&ctx->EFlags))