libpthread_md.c revision 146818 
1/*
2 * Copyright (c) 2004 David Xu <davidxu@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libthread_db/arch/i386/libpthread_md.c 146818 2005-05-31 09:43:04Z dfr $");
29
30#include <string.h>
31#include <sys/types.h>
32#include <proc_service.h>
33#include <thread_db.h>
34#include <machine/npx.h>
35
36#include "libpthread_db.h"
37
38static int has_xmm_regs;
39
40void
41pt_reg_to_ucontext(const struct reg *r, ucontext_t *uc)
42{
43	memcpy(&uc->uc_mcontext.mc_fs, &r->r_fs, 18*4);
44	uc->uc_mcontext.mc_gs = r->r_gs;
45}
46
47void
48pt_ucontext_to_reg(const ucontext_t *uc, struct reg *r)
49{
50	memcpy(&r->r_fs, &uc->uc_mcontext.mc_fs, 18*4);
51	r->r_gs = uc->uc_mcontext.mc_gs;
52}
53
54void
55pt_fpreg_to_ucontext(const struct fpreg* r, ucontext_t *uc)
56{
57	if (!has_xmm_regs)
58		memcpy(&uc->uc_mcontext.mc_fpstate, r,
59			sizeof(struct save87));
60	else {
61		int i;
62		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
63		memcpy(&sx->sv_env, &r->fpr_env, sizeof(r->fpr_env));
64		for (i = 0; i < 8; ++i)
65			memcpy(&sx->sv_fp[i].fp_acc, &r->fpr_acc[i], 10);
66	}
67}
68
69void
70pt_ucontext_to_fpreg(const ucontext_t *uc, struct fpreg *r)
71{
72	if (!has_xmm_regs)
73		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct save87));
74	else {
75		int i;
76		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
77		memcpy(&r->fpr_env, &sx->sv_env, sizeof(r->fpr_env));
78		for (i = 0; i < 8; ++i)
79			memcpy(&r->fpr_acc[i], &sx->sv_fp[i].fp_acc, 10);
80	}
81}
82
83void
84pt_fxsave_to_ucontext(const char* r, ucontext_t *uc)
85{
86	if (has_xmm_regs)
87		memcpy(&uc->uc_mcontext.mc_fpstate, r, sizeof(struct savexmm));
88}
89
90void
91pt_ucontext_to_fxsave(const ucontext_t *uc, char *r)
92{
93	if (has_xmm_regs)
94		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct savexmm));
95}
96
97void
98pt_md_init(void)
99{
100	ucontext_t uc;
101
102	getcontext(&uc);
103	if (uc.uc_mcontext.mc_fpformat == _MC_FPFMT_XMM)
104	    has_xmm_regs = 1;
105}
106
107int
108pt_reg_sstep(struct reg *reg, int step)
109{
110	unsigned int old;
111
112	old = reg->r_eflags;
113	if (step)
114		reg->r_eflags |= 0x0100;
115	else
116		reg->r_eflags &= ~0x0100;
117	return (old != reg->r_eflags); /* changed ? */
118}
119
120