1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2004 David Xu <davidxu@freebsd.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <sys/types.h>
33 #include <machine/npx.h>
34 #include <string.h>
35 #include <thread_db.h>
36 
37 #include "libpthread_db.h"
38 
39 static int has_xmm_regs;
40 
41 void
42 pt_reg_to_ucontext(const struct reg *r, ucontext_t *uc)
43 {
44 	memcpy(&uc->uc_mcontext.mc_fs, &r->r_fs, 18*4);
45 	uc->uc_mcontext.mc_gs = r->r_gs;
46 }
47 
48 void
49 pt_ucontext_to_reg(const ucontext_t *uc, struct reg *r)
50 {
51 	memcpy(&r->r_fs, &uc->uc_mcontext.mc_fs, 18*4);
52 	r->r_gs = uc->uc_mcontext.mc_gs;
53 }
54 
55 void
56 pt_fpreg_to_ucontext(const struct fpreg* r, ucontext_t *uc)
57 {
58 	if (!has_xmm_regs)
59 		memcpy(&uc->uc_mcontext.mc_fpstate, r,
60 			sizeof(struct save87));
61 	else {
62 		int i;
63 		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
64 		memcpy(&sx->sv_env, &r->fpr_env, sizeof(r->fpr_env));
65 		for (i = 0; i < 8; ++i)
66 			memcpy(&sx->sv_fp[i].fp_acc, &r->fpr_acc[i], 10);
67 	}
68 }
69 
70 void
71 pt_ucontext_to_fpreg(const ucontext_t *uc, struct fpreg *r)
72 {
73 	if (!has_xmm_regs)
74 		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct save87));
75 	else {
76 		int i;
77 		const struct savexmm *sx = (const struct savexmm *)&uc->uc_mcontext.mc_fpstate;
78 		memcpy(&r->fpr_env, &sx->sv_env, sizeof(r->fpr_env));
79 		for (i = 0; i < 8; ++i)
80 			memcpy(&r->fpr_acc[i], &sx->sv_fp[i].fp_acc, 10);
81 	}
82 }
83 
84 void
85 pt_fxsave_to_ucontext(const char* r, ucontext_t *uc)
86 {
87 	if (has_xmm_regs)
88 		memcpy(&uc->uc_mcontext.mc_fpstate, r, sizeof(struct savexmm));
89 }
90 
91 void
92 pt_ucontext_to_fxsave(const ucontext_t *uc, char *r)
93 {
94 	if (has_xmm_regs)
95 		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct savexmm));
96 }
97 
98 void
99 pt_md_init(void)
100 {
101 	ucontext_t uc;
102 
103 	getcontext(&uc);
104 	if (uc.uc_mcontext.mc_fpformat == _MC_FPFMT_XMM)
105 	    has_xmm_regs = 1;
106 }
107 
108 int
109 pt_reg_sstep(struct reg *reg, int step)
110 {
111 	unsigned int old;
112 
113 	old = reg->r_eflags;
114 	if (step)
115 		reg->r_eflags |= 0x0100;
116 	else
117 		reg->r_eflags &= ~0x0100;
118 	return (old != reg->r_eflags); /* changed ? */
119 }
120 
121