freebsd-nq/lib/libthread_db/arch/i386/libpthread_md.c

/*
 * Copyright (c) 2004 David Xu <davidxu@freebsd.org>
 * 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 THE AUTHOR 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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>
#include <machine/npx.h>
#include <string.h>
#include <thread_db.h>

#include "libpthread_db.h"

static int has_xmm_regs;

void
pt_reg_to_ucontext(const struct reg *r, ucontext_t *uc)
{
	memcpy(&uc->uc_mcontext.mc_fs, &r->r_fs, 18*4);
	uc->uc_mcontext.mc_gs = r->r_gs;
}

void
pt_ucontext_to_reg(const ucontext_t *uc, struct reg *r)
{
	memcpy(&r->r_fs, &uc->uc_mcontext.mc_fs, 18*4);
	r->r_gs = uc->uc_mcontext.mc_gs;
}

void
pt_fpreg_to_ucontext(const struct fpreg* r, ucontext_t *uc)
{
	if (!has_xmm_regs)
		memcpy(&uc->uc_mcontext.mc_fpstate, r,
			sizeof(struct save87));
	else {
		int i;
		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
		memcpy(&sx->sv_env, &r->fpr_env, sizeof(r->fpr_env));
		for (i = 0; i < 8; ++i)
			memcpy(&sx->sv_fp[i].fp_acc, &r->fpr_acc[i], 10);
	}
}

void
pt_ucontext_to_fpreg(const ucontext_t *uc, struct fpreg *r)
{
	if (!has_xmm_regs)
		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct save87));
	else {
		int i;
		const struct savexmm *sx = (const struct savexmm *)&uc->uc_mcontext.mc_fpstate;
		memcpy(&r->fpr_env, &sx->sv_env, sizeof(r->fpr_env));
		for (i = 0; i < 8; ++i)
			memcpy(&r->fpr_acc[i], &sx->sv_fp[i].fp_acc, 10);
	}
}

void
pt_fxsave_to_ucontext(const char* r, ucontext_t *uc)
{
	if (has_xmm_regs)
		memcpy(&uc->uc_mcontext.mc_fpstate, r, sizeof(struct savexmm));
}

void
pt_ucontext_to_fxsave(const ucontext_t *uc, char *r)
{
	if (has_xmm_regs)
		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct savexmm));
}

void
pt_md_init(void)
{
	ucontext_t uc;

	getcontext(&uc);
	if (uc.uc_mcontext.mc_fpformat == _MC_FPFMT_XMM)
	    has_xmm_regs = 1;
}

int
pt_reg_sstep(struct reg *reg, int step)
{
	unsigned int old;
	
	old = reg->r_eflags;
	if (step)
		reg->r_eflags |= 0x0100;
	else
		reg->r_eflags &= ~0x0100;
	return (old != reg->r_eflags); /* changed ? */
}