90c38ed200
a group of dos emulator developers. Submitted by: Jonathan Lemon <jlemon@americantv.com> Obtained from: BSDI
223 lines
5.8 KiB
C
223 lines
5.8 KiB
C
/*
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** Copyright (c) 1996
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** Michael Smith. All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY Michael Smith ``AS IS'' AND
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** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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** ARE DISCLAIMED. IN NO EVENT SHALL Michael Smith BE LIABLE
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** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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** SUCH DAMAGE.
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**
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** $Id: register.h,v 1.4 1997/03/18 02:36:56 msmith Exp $
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*/
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/******************************************************************************
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** Abstractions to hide register access methods across different platforms.
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**
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*/
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#define NEW_REGISTERS
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#ifndef _MACHINE_VM86_H_
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/* standard register representation */
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typedef union
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{
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u_long r_ex;
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struct
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{
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u_short r_x;
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u_short :16;
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} r_w;
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struct
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{
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u_char r_l;
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u_char r_h;
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u_short :16;
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} r_b;
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} reg86_t;
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#endif
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#ifdef __FreeBSD__
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/* layout must match definition of struct sigcontext in <machine/signal.h> */
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typedef struct
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{
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int pad[2];
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reg86_t esp;
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reg86_t ebp;
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reg86_t isp;
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reg86_t eip;
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reg86_t efl;
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reg86_t es;
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reg86_t ds;
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reg86_t cs;
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reg86_t ss;
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reg86_t edi;
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reg86_t esi;
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reg86_t ebx;
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reg86_t edx;
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reg86_t ecx;
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reg86_t eax;
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reg86_t gs;
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reg86_t fs;
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} registers_t;
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typedef union
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{
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struct sigcontext sc;
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registers_t r;
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} regcontext_t;
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/*
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** passed around as a reference to the registers. This must be in
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** scope for the following register macros to work.
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*/
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/* register shorthands */
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#define R_ESP (REGS->r.esp.r_ex)
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#define R_SP (REGS->r.esp.r_w.r_x)
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#define R_EBP (REGS->r.ebp.r_ex)
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#define R_BP (REGS->r.ebp.r_w.r_x)
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#define R_ISP (REGS->r.isp.r_ex)
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#define R_EIP (REGS->r.eip.r_ex)
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#define R_IP (REGS->r.eip.r_w.r_x)
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#define R_EFLAGS (REGS->r.efl.r_ex)
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#define R_FLAGS (REGS->r.efl.r_w.r_x)
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#define R_EES (REGS->r.es.r_ex)
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#define R_ES (REGS->r.es.r_w.r_x)
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#define R_EDS (REGS->r.ds.r_ex)
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#define R_DS (REGS->r.ds.r_w.r_x)
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#define R_ECS (REGS->r.cs.r_ex)
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#define R_CS (REGS->r.cs.r_w.r_x)
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#define R_ESS (REGS->r.ss.r_ex)
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#define R_SS (REGS->r.ss.r_w.r_x)
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#define R_EDI (REGS->r.edi.r_ex)
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#define R_DI (REGS->r.edi.r_w.r_x)
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#define R_ESI (REGS->r.esi.r_ex)
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#define R_SI (REGS->r.esi.r_w.r_x)
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#define R_EBX (REGS->r.ebx.r_ex)
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#define R_BX (REGS->r.ebx.r_w.r_x)
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#define R_BL (REGS->r.ebx.r_b.r_l)
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#define R_BH (REGS->r.ebx.r_b.r_h)
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#define R_EDX (REGS->r.edx.r_ex)
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#define R_DX (REGS->r.edx.r_w.r_x)
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#define R_DL (REGS->r.edx.r_b.r_l)
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#define R_DH (REGS->r.edx.r_b.r_h)
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#define R_ECX (REGS->r.ecx.r_ex)
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#define R_CX (REGS->r.ecx.r_w.r_x)
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#define R_CL (REGS->r.ecx.r_b.r_l)
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#define R_CH (REGS->r.ecx.r_b.r_h)
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#define R_EAX (REGS->r.eax.r_ex)
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#define R_AX (REGS->r.eax.r_w.r_x)
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#define R_AL (REGS->r.eax.r_b.r_l)
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#define R_AH (REGS->r.eax.r_b.r_h)
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#define R_EGS (REGS->r.gs.r_ex)
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#define R_GS (REGS->r.gs.r_w.r_x)
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#define R_EFS (REGS->r.fs.r_ex)
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#define R_FS (REGS->r.fs.r_w.r_x)
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#endif
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#ifdef __bsdi__
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#endif
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#ifdef __NetBSD__
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#endif
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/*
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** register manipulation macros
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*/
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#define N_PUTVEC(s, o, x) ((s) = ((x) >> 16), (o) = (x) & 0xffff)
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#define MAKEVEC(s, o) (((s) << 16) + (o)) /* XXX these two should be combined */
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#define N_GETVEC(s, o) (((s) << 16) + (o))
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#define N_PUTPTR(s, o, x) (((s) = ((x) & 0xf0000) >> 4), (o) = (x) & 0xffff)
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#define MAKEPTR(s, o) (((s) << 4) + (o)) /* XXX these two should be combined */
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#define N_GETPTR(s, o) (((s) << 4) + (o))
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#define VECPTR(x) MAKEPTR((x) >> 16, (x) & 0xffff)
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#if 0
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#define N_REGISTERS regcontext_t *_regcontext
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#define N_REGS _regcontex
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#endif
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inline static void
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N_PUSH(u_short x, regcontext_t *REGS)
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{
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R_SP -= 2;
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*(u_short *)N_GETPTR(R_SS, R_SP) = (x);
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}
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inline static u_short
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N_POP(regcontext_t *REGS)
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{
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u_short x;
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x = *(u_short *)N_GETPTR(R_SS, R_SP);
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R_SP += 2;
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return(x);
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}
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# ifndef PSL_ALLCC /* Grr, FreeBSD doesn't have this */
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# define PSL_ALLCC (PSL_C|PSL_PF|PSL_AF|PSL_Z|PSL_N)
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# endif
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/******************************************************************************
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** older stuff below here
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*/
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#define REGISTERS struct sigcontext *sc
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#define GET16(x) (x & 0xffff)
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#define GET8L(x) (x & 0xff)
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#define GET8H(x) ((x >> 8) & 0xff)
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#define SET16(x, y) (x = (x & ~0xffff) | (y & 0xffff))
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#define SET8L(x, y) (x = (x & ~0xff) | (y & 0xff))
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#define SET8H(x, y) (x = (x & ~0xff00) | ((y & 0xff) << 8))
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#define PUTVEC(s, o, x) (SET16(s, x >> 16), SET16(o, x))
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#define GETVEC(s, o) MAKEVEC(GET16(s), GET16(o))
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#define PUTPTR(s, o, x) (SET16(s, (x & 0xf0000) >> 4), SET16(o, x))
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#define GETPTR(s, o) MAKEPTR(GET16(s), GET16(o))
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#define VECPTR(x) MAKEPTR((x) >> 16, (x) & 0xffff)
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inline static void
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PUSH(u_short x, struct sigcontext *sc)
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{
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SET16(sc->sc_esp, GET16(sc->sc_esp) - 2);
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*(u_short *)GETPTR(sc->sc_ss, sc->sc_esp) = x;
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}
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inline static u_short
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POP(struct sigcontext *sc)
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{
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u_short x;
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x = *(u_short *)GETPTR(sc->sc_ss, sc->sc_esp);
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SET16(sc->sc_esp, GET16(sc->sc_esp) + 2);
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return (x);
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}
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