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/*
** Copyright (c) 1996
** Michael Smith. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** THIS SOFTWARE IS PROVIDED BY Michael Smith ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL Michael Smith BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** $FreeBSD$
*/
/******************************************************************************
** Abstractions to hide register access methods across different platforms.
**
*/
#ifndef _MACHINE_VM86_H_
/* standard register representation */
typedef union
{
u_long r_ex;
struct
{
u_short r_x;
u_short :16;
} r_w;
struct
{
u_char r_l;
u_char r_h;
u_short :16;
} r_b;
} reg86_t;
#endif
#ifdef __FreeBSD__
/* layout must match definition of struct sigcontext in <machine/signal.h> */
typedef struct
{
int onstack;
reg86_t gs;
reg86_t fs;
reg86_t es;
reg86_t ds;
reg86_t edi;
reg86_t esi;
reg86_t ebp;
reg86_t isp;
reg86_t ebx;
reg86_t edx;
reg86_t ecx;
reg86_t eax;
int pad[2];
reg86_t eip;
reg86_t cs;
reg86_t efl;
reg86_t esp;
reg86_t ss;
} registers_t;
typedef union
{
mcontext_t sc;
registers_t r;
} regcontext_t;
/*
** passed around as a reference to the registers. This must be in
** scope for the following register macros to work.
*/
/* register shorthands */
#define R_ESP (REGS->r.esp.r_ex)
#define R_SP (REGS->r.esp.r_w.r_x)
#define R_EBP (REGS->r.ebp.r_ex)
#define R_BP (REGS->r.ebp.r_w.r_x)
#define R_ISP (REGS->r.isp.r_ex)
#define R_EIP (REGS->r.eip.r_ex)
#define R_IP (REGS->r.eip.r_w.r_x)
#define R_EFLAGS (REGS->r.efl.r_ex)
#define R_FLAGS (REGS->r.efl.r_w.r_x)
#define R_EES (REGS->r.es.r_ex)
#define R_ES (REGS->r.es.r_w.r_x)
#define R_EDS (REGS->r.ds.r_ex)
#define R_DS (REGS->r.ds.r_w.r_x)
#define R_ECS (REGS->r.cs.r_ex)
#define R_CS (REGS->r.cs.r_w.r_x)
#define R_ESS (REGS->r.ss.r_ex)
#define R_SS (REGS->r.ss.r_w.r_x)
#define R_EDI (REGS->r.edi.r_ex)
#define R_DI (REGS->r.edi.r_w.r_x)
#define R_ESI (REGS->r.esi.r_ex)
#define R_SI (REGS->r.esi.r_w.r_x)
#define R_EBX (REGS->r.ebx.r_ex)
#define R_BX (REGS->r.ebx.r_w.r_x)
#define R_BL (REGS->r.ebx.r_b.r_l)
#define R_BH (REGS->r.ebx.r_b.r_h)
#define R_EDX (REGS->r.edx.r_ex)
#define R_DX (REGS->r.edx.r_w.r_x)
#define R_DL (REGS->r.edx.r_b.r_l)
#define R_DH (REGS->r.edx.r_b.r_h)
#define R_ECX (REGS->r.ecx.r_ex)
#define R_CX (REGS->r.ecx.r_w.r_x)
#define R_CL (REGS->r.ecx.r_b.r_l)
#define R_CH (REGS->r.ecx.r_b.r_h)
#define R_EAX (REGS->r.eax.r_ex)
#define R_AX (REGS->r.eax.r_w.r_x)
#define R_AL (REGS->r.eax.r_b.r_l)
#define R_AH (REGS->r.eax.r_b.r_h)
#define R_EGS (REGS->r.gs.r_ex)
#define R_GS (REGS->r.gs.r_w.r_x)
#define R_EFS (REGS->r.fs.r_ex)
#define R_FS (REGS->r.fs.r_w.r_x)
#endif
#ifdef __bsdi__
#endif
#ifdef __NetBSD__
#endif
/*
** register manipulation macros
*/
#define PUTVEC(s, o, x) ((s) = ((x) >> 16), (o) = (x) & 0xffff)
#define MAKEVEC(s, o) (((s) << 16) + (o))
#define PUTPTR(s, o, x) (((s) = ((x) & 0xf0000) >> 4), (o) = (x) & 0xffff)
#define MAKEPTR(s, o) (((s) << 4) + (o))
#define VECPTR(x) MAKEPTR((x) >> 16, (x) & 0xffff)
#define REGISTERS regcontext_t *REGS
static __inline void
PUSH(u_short x, REGISTERS)
{
R_SP -= 2;
*(u_short *)MAKEPTR(R_SS, R_SP) = (x);
}
static __inline u_short
POP(REGISTERS)
{
u_short x;
x = *(u_short *)MAKEPTR(R_SS, R_SP);
R_SP += 2;
return(x);
}
# ifndef PSL_ALLCC /* Grr, FreeBSD doesn't have this */
# define PSL_ALLCC (PSL_C|PSL_PF|PSL_AF|PSL_Z|PSL_N)
# endif
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