/* $OpenBSD: process_machdep.c,v 1.22 2007/05/08 20:26:54 deraadt Exp $ */
/* $NetBSD: process_machdep.c,v 1.22 1996/05/03 19:42:25 christos Exp $ */
/*
* Copyright (c) 1995, 1996 Charles M. Hannum. All rights reserved.
* Copyright (c) 1993 The Regents of the University of California.
* Copyright (c) 1993 Jan-Simon Pendry
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* From:
* Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
*/
/*
* This file may seem a bit stylized, but that so that it's easier to port.
* Functions to be implemented here are:
*
* process_read_regs(proc, regs)
* Get the current user-visible register set from the process
* and copy it into the regs structure (<machine/reg.h>).
* The process is stopped at the time read_regs is called.
*
* process_write_regs(proc, regs)
* Update the current register set from the passed in regs
* structure. Take care to avoid clobbering special CPU
* registers or privileged bits in the PSL.
* The process is stopped at the time write_regs is called.
*
* process_sstep(proc)
* Arrange for the process to trap after executing a single instruction.
*
* process_set_pc(proc)
* Set the process's program counter.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <sys/ptrace.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <machine/segments.h>
#ifdef VM86
#include <machine/vm86.h>
#endif
#include "npx.h"
static __inline struct trapframe *process_frame(struct proc *);
static __inline union savefpu *process_fpframe(struct proc *);
void process_fninit_xmm(struct savexmm *);
static __inline struct trapframe *
process_frame(struct proc *p)
{
return (p->p_md.md_regs);
}
static __inline union savefpu *
process_fpframe(struct proc *p)
{
return (&p->p_addr->u_pcb.pcb_savefpu);
}
void
process_xmm_to_s87(const struct savexmm *sxmm, struct save87 *s87)
{
int i;
/* FPU control/status */
s87->sv_env.en_cw = sxmm->sv_env.en_cw;
s87->sv_env.en_sw = sxmm->sv_env.en_sw;
/* tag word handled below */
s87->sv_env.en_fip = sxmm->sv_env.en_fip;
s87->sv_env.en_fcs = sxmm->sv_env.en_fcs;
s87->sv_env.en_opcode = sxmm->sv_env.en_opcode;
s87->sv_env.en_foo = sxmm->sv_env.en_foo;
s87->sv_env.en_fos = sxmm->sv_env.en_fos;
/* Tag word and registers. */
for (i = 0; i < 8; i++) {
if (sxmm->sv_env.en_tw & (1U << i))
s87->sv_env.en_tw &= ~(3U << (i * 2));
else
s87->sv_env.en_tw |= (3U << (i * 2));
if (sxmm->sv_ex_tw & (1U << i))
s87->sv_ex_tw &= ~(3U << (i * 2));
else
s87->sv_ex_tw |= (3U << (i * 2));
memcpy(&s87->sv_ac[i].fp_bytes, &sxmm->sv_ac[i].fp_bytes,
sizeof(s87->sv_ac[i].fp_bytes));
}
s87->sv_ex_sw = sxmm->sv_ex_sw;
}
void
process_fninit_xmm(struct savexmm *sxmm)
{
/*
* The initial control word was already set by setregs(), so
* save it temporarily.
*/
uint32_t mxcsr = sxmm->sv_env.en_mxcsr;
uint16_t cw = sxmm->sv_env.en_cw;
/* XXX Don't zero XMM regs? */
memset(sxmm, 0, sizeof(*sxmm));
sxmm->sv_env.en_cw = cw;
sxmm->sv_env.en_mxcsr = mxcsr;
sxmm->sv_env.en_sw = 0x0000;
sxmm->sv_env.en_tw = 0x00;
}
int
process_read_regs(struct proc *p, struct reg *regs)
{
struct trapframe *tf = process_frame(p);
#ifdef VM86
if (tf->tf_eflags & PSL_VM) {
regs->r_gs = tf->tf_vm86_gs & 0xffff;
regs->r_fs = tf->tf_vm86_fs & 0xffff;
regs->r_es = tf->tf_vm86_es & 0xffff;
regs->r_ds = tf->tf_vm86_ds & 0xffff;
regs->r_eflags = get_vflags(p);
} else
#endif
{
regs->r_gs = tf->tf_gs & 0xffff;
regs->r_fs = tf->tf_fs & 0xffff;
regs->r_es = tf->tf_es & 0xffff;
regs->r_ds = tf->tf_ds & 0xffff;
regs->r_eflags = tf->tf_eflags;
}
regs->r_edi = tf->tf_edi;
regs->r_esi = tf->tf_esi;
regs->r_ebp = tf->tf_ebp;
regs->r_ebx = tf->tf_ebx;
regs->r_edx = tf->tf_edx;
regs->r_ecx = tf->tf_ecx;
regs->r_eax = tf->tf_eax;
regs->r_eip = tf->tf_eip;
regs->r_cs = tf->tf_cs & 0xffff;
regs->r_esp = tf->tf_esp;
regs->r_ss = tf->tf_ss & 0xffff;
return (0);
}
int
process_read_fpregs(struct proc *p, struct fpreg *regs)
{
union savefpu *frame = process_fpframe(p);
if (p->p_md.md_flags & MDP_USEDFPU) {
#if NNPX > 0
npxsave_proc(p, 1);
#endif
} else {
/* Fake a FNINIT. */
if (i386_use_fxsave) {
process_fninit_xmm(&frame->sv_xmm);
} else {
/*
* The initial control word was already set by
* setregs(), so save it temporarily.
*/
uint16_t cw = frame->sv_87.sv_env.en_cw;
memset(&frame->sv_87, 0, sizeof(frame->sv_87));
frame->sv_87.sv_env.en_cw = cw;
frame->sv_87.sv_env.en_sw = 0x0000;
frame->sv_87.sv_env.en_tw = 0xffff;
}
p->p_md.md_flags |= MDP_USEDFPU;
}
if (i386_use_fxsave) {
struct save87 s87;
/* XXX Yuck */
process_xmm_to_s87(&frame->sv_xmm, &s87);
memcpy(regs, &s87, sizeof(*regs));
} else
memcpy(regs, &frame->sv_87, sizeof(*regs));
return (0);
}
#ifdef PTRACE
void
process_s87_to_xmm(const struct save87 *s87, struct savexmm *sxmm)
{
int i;
/* FPU control/status */
sxmm->sv_env.en_cw = s87->sv_env.en_cw;
sxmm->sv_env.en_sw = s87->sv_env.en_sw;
/* tag word handled below */
sxmm->sv_env.en_fip = s87->sv_env.en_fip;
sxmm->sv_env.en_fcs = s87->sv_env.en_fcs;
sxmm->sv_env.en_opcode = s87->sv_env.en_opcode;
sxmm->sv_env.en_foo = s87->sv_env.en_foo;
sxmm->sv_env.en_fos = s87->sv_env.en_fos;
/* Tag word and registers. */
for (i = 0; i < 8; i++) {
if (((s87->sv_env.en_tw >> (i * 2)) & 3) == 3)
sxmm->sv_env.en_tw &= ~(1U << i);
else
sxmm->sv_env.en_tw |= (1U << i);
if (((s87->sv_ex_tw >> (i * 2)) & 3) == 3)
sxmm->sv_ex_tw &= ~(1U << i);
else
sxmm->sv_ex_tw |= (1U << i);
memcpy(&sxmm->sv_ac[i].fp_bytes, &s87->sv_ac[i].fp_bytes,
sizeof(sxmm->sv_ac[i].fp_bytes));
}
sxmm->sv_ex_sw = s87->sv_ex_sw;
}
int
process_write_regs(struct proc *p, struct reg *regs)
{
struct trapframe *tf = process_frame(p);
#ifdef VM86
if (tf->tf_eflags & PSL_VM) {
tf->tf_vm86_gs = regs->r_gs & 0xffff;
tf->tf_vm86_fs = regs->r_fs & 0xffff;
tf->tf_vm86_es = regs->r_es & 0xffff;
tf->tf_vm86_ds = regs->r_ds & 0xffff;
set_vflags(p, regs->r_eflags);
} else
#endif
{
/*
* Check for security violations.
*/
if (((regs->r_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(regs->r_cs, regs->r_eflags))
return (EINVAL);
tf->tf_gs = regs->r_gs & 0xffff;
tf->tf_fs = regs->r_fs & 0xffff;
tf->tf_es = regs->r_es & 0xffff;
tf->tf_ds = regs->r_ds & 0xffff;
tf->tf_eflags = regs->r_eflags;
}
tf->tf_edi = regs->r_edi;
tf->tf_esi = regs->r_esi;
tf->tf_ebp = regs->r_ebp;
tf->tf_ebx = regs->r_ebx;
tf->tf_edx = regs->r_edx;
tf->tf_ecx = regs->r_ecx;
tf->tf_eax = regs->r_eax;
tf->tf_eip = regs->r_eip;
tf->tf_cs = regs->r_cs & 0xffff;
tf->tf_esp = regs->r_esp;
tf->tf_ss = regs->r_ss & 0xffff;
return (0);
}
int
process_write_fpregs(struct proc *p, struct fpreg *regs)
{
union savefpu *frame = process_fpframe(p);
if (p->p_md.md_flags & MDP_USEDFPU) {
#if NNPX > 0
npxsave_proc(p, 0);
#endif
} else
p->p_md.md_flags |= MDP_USEDFPU;
if (i386_use_fxsave) {
struct save87 s87;
/* XXX Yuck. */
memcpy(&s87, regs, sizeof(*regs));
process_s87_to_xmm(&s87, &frame->sv_xmm);
} else
memcpy(&frame->sv_87, regs, sizeof(*regs));
return (0);
}
int
process_read_xmmregs(struct proc *p, struct xmmregs *regs)
{
union savefpu *frame = process_fpframe(p);
if (!i386_use_fxsave)
return (EINVAL);
if (p->p_md.md_flags & MDP_USEDFPU) {
#if NNPX > 0
npxsave_proc(p, 1);
#endif
} else {
/* Fake a FNINIT. */
process_fninit_xmm(&frame->sv_xmm);
p->p_md.md_flags |= MDP_USEDFPU;
}
memcpy(regs, &frame->sv_xmm, sizeof(*regs));
return (0);
}
int
process_write_xmmregs(struct proc *p, const struct xmmregs *regs)
{
union savefpu *frame = process_fpframe(p);
if (!i386_use_fxsave)
return (EINVAL);
if (p->p_md.md_flags & MDP_USEDFPU) {
#if NNPX > 0
npxsave_proc(p, 0);
#endif
} else
p->p_md.md_flags |= MDP_USEDFPU;
memcpy(&frame->sv_xmm, regs, sizeof(*regs));
return (0);
}
int
process_sstep(struct proc *p, int sstep)
{
struct trapframe *tf = process_frame(p);
if (sstep)
tf->tf_eflags |= PSL_T;
else
tf->tf_eflags &= ~PSL_T;
return (0);
}
int
process_set_pc(struct proc *p, caddr_t addr)
{
struct trapframe *tf = process_frame(p);
tf->tf_eip = (int)addr;
return (0);
}
#endif /* PTRACE */