1 /* $NetBSD: process_machdep.c,v 1.30 2017/03/16 16:13:20 chs Exp $ */
2
3 /*
4 * Copyright (c) 1994 Christopher G. Demetriou
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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Christopher G. Demetriou.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * This file may seem a bit stylized, but that so that it's easier to port.
35 * Functions to be implemented here are:
36 *
37 * process_read_regs(proc, regs)
38 * Get the current user-visible register set from the process
39 * and copy it into the regs structure (<machine/reg.h>).
40 * The process is stopped at the time read_regs is called.
41 *
42 * process_write_regs(proc, regs)
43 * Update the current register set from the passed in regs
44 * structure. Take care to avoid clobbering special CPU
45 * registers or privileged bits in the PSL.
46 * The process is stopped at the time write_regs is called.
47 *
48 * process_sstep(proc)
49 * Arrange for the process to trap after executing a single instruction.
50 *
51 * process_set_pc(proc)
52 * Set the process's program counter.
53 */
54
55 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
56
57 __KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.30 2017/03/16 16:13:20 chs Exp $");
58
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/kernel.h>
62 #include <sys/proc.h>
63 #include <sys/vnode.h>
64 #include <sys/ptrace.h>
65
66 #include <machine/cpu.h>
67 #include <machine/reg.h>
68 #include <machine/frame.h>
69 #include <machine/alpha.h>
70
71 #define lwp_frame(l) ((l)->l_md.md_tf)
72
73 int
process_read_regs(struct lwp * l,struct reg * regs)74 process_read_regs(struct lwp *l, struct reg *regs)
75 {
76 struct pcb *pcb = lwp_getpcb(l);
77
78 frametoreg(lwp_frame(l), regs);
79 regs->r_regs[R_ZERO] = lwp_frame(l)->tf_regs[FRAME_PC];
80 regs->r_regs[R_SP] = pcb->pcb_hw.apcb_usp;
81 return (0);
82 }
83
84 int
process_write_regs(struct lwp * l,const struct reg * regs)85 process_write_regs(struct lwp *l, const struct reg *regs)
86 {
87 struct pcb *pcb = lwp_getpcb(l);
88
89 regtoframe(regs, lwp_frame(l));
90 lwp_frame(l)->tf_regs[FRAME_PC] = regs->r_regs[R_ZERO];
91 pcb->pcb_hw.apcb_usp = regs->r_regs[R_SP];
92 return (0);
93 }
94
95 int
process_sstep(struct lwp * l,int sstep)96 process_sstep(struct lwp *l, int sstep)
97 {
98
99 if (sstep)
100 return (EINVAL);
101
102 return (0);
103 }
104
105 int
process_set_pc(struct lwp * l,void * addr)106 process_set_pc(struct lwp *l, void *addr)
107 {
108 struct trapframe *frame = lwp_frame(l);
109
110 frame->tf_regs[FRAME_PC] = (uint64_t)addr;
111 return (0);
112 }
113
114 int
process_read_fpregs(struct lwp * l,struct fpreg * regs,size_t * sz)115 process_read_fpregs(struct lwp *l, struct fpreg *regs, size_t *sz)
116 {
117 struct pcb *pcb = lwp_getpcb(l);
118
119 fpu_save(l);
120
121 memcpy(regs, &pcb->pcb_fp, sizeof(struct fpreg));
122 return (0);
123 }
124
125 int
process_write_fpregs(struct lwp * l,const struct fpreg * regs,size_t sz)126 process_write_fpregs(struct lwp *l, const struct fpreg *regs, size_t sz)
127 {
128 struct pcb *pcb = lwp_getpcb(l);
129
130 fpu_discard(l, true);
131
132 memcpy(&pcb->pcb_fp, regs, sizeof(struct fpreg));
133 return (0);
134 }
135