xref: /freebsd/lib/libthread_db/arch/i386/libpthread_md.c (revision f7c4bd95ba735bd6a5454b4953945a99cefbb80c)
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("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <machine/npx.h>
32 #include <string.h>
33 #include <thread_db.h>
34 
35 #include "libpthread_db.h"
36 
37 static int has_xmm_regs;
38 
39 void
40 pt_reg_to_ucontext(const struct reg *r, ucontext_t *uc)
41 {
42 	memcpy(&uc->uc_mcontext.mc_fs, &r->r_fs, 18*4);
43 	uc->uc_mcontext.mc_gs = r->r_gs;
44 }
45 
46 void
47 pt_ucontext_to_reg(const ucontext_t *uc, struct reg *r)
48 {
49 	memcpy(&r->r_fs, &uc->uc_mcontext.mc_fs, 18*4);
50 	r->r_gs = uc->uc_mcontext.mc_gs;
51 }
52 
53 void
54 pt_fpreg_to_ucontext(const struct fpreg* r, ucontext_t *uc)
55 {
56 	if (!has_xmm_regs)
57 		memcpy(&uc->uc_mcontext.mc_fpstate, r,
58 			sizeof(struct save87));
59 	else {
60 		int i;
61 		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
62 		memcpy(&sx->sv_env, &r->fpr_env, sizeof(r->fpr_env));
63 		for (i = 0; i < 8; ++i)
64 			memcpy(&sx->sv_fp[i].fp_acc, &r->fpr_acc[i], 10);
65 	}
66 }
67 
68 void
69 pt_ucontext_to_fpreg(const ucontext_t *uc, struct fpreg *r)
70 {
71 	if (!has_xmm_regs)
72 		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct save87));
73 	else {
74 		int i;
75 		struct savexmm *sx = (struct savexmm *)&uc->uc_mcontext.mc_fpstate;
76 		memcpy(&r->fpr_env, &sx->sv_env, sizeof(r->fpr_env));
77 		for (i = 0; i < 8; ++i)
78 			memcpy(&r->fpr_acc[i], &sx->sv_fp[i].fp_acc, 10);
79 	}
80 }
81 
82 void
83 pt_fxsave_to_ucontext(const char* r, ucontext_t *uc)
84 {
85 	if (has_xmm_regs)
86 		memcpy(&uc->uc_mcontext.mc_fpstate, r, sizeof(struct savexmm));
87 }
88 
89 void
90 pt_ucontext_to_fxsave(const ucontext_t *uc, char *r)
91 {
92 	if (has_xmm_regs)
93 		memcpy(r, &uc->uc_mcontext.mc_fpstate, sizeof(struct savexmm));
94 }
95 
96 void
97 pt_md_init(void)
98 {
99 	ucontext_t uc;
100 
101 	getcontext(&uc);
102 	if (uc.uc_mcontext.mc_fpformat == _MC_FPFMT_XMM)
103 	    has_xmm_regs = 1;
104 }
105 
106 int
107 pt_reg_sstep(struct reg *reg, int step)
108 {
109 	unsigned int old;
110 
111 	old = reg->r_eflags;
112 	if (step)
113 		reg->r_eflags |= 0x0100;
114 	else
115 		reg->r_eflags &= ~0x0100;
116 	return (old != reg->r_eflags); /* changed ? */
117 }
118 
119