1 /*
2 * Copyright 1998 Sean Eric Fagan
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 * products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 /* FreeBSD/sparc64-specific system call handling. */
36
37 #include <sys/ptrace.h>
38 #include <sys/syscall.h>
39
40 #include <machine/frame.h>
41 #include <machine/reg.h>
42 #include <machine/tstate.h>
43
44 #include <stddef.h>
45 #include <stdio.h>
46
47 #include "truss.h"
48
49 #include "freebsd_syscalls.h"
50
51 static int
sparc64_fetch_args(struct trussinfo * trussinfo,u_int narg)52 sparc64_fetch_args(struct trussinfo *trussinfo, u_int narg)
53 {
54 struct ptrace_io_desc iorequest;
55 struct reg regs;
56 struct current_syscall *cs;
57 lwpid_t tid;
58 u_int i, reg;
59
60 tid = trussinfo->curthread->tid;
61 cs = &trussinfo->curthread->cs;
62 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
63 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
64 return (-1);
65 }
66
67 /*
68 * FreeBSD has two special kinds of system call redirections --
69 * SYS_syscall, and SYS___syscall. The former is the old syscall()
70 * routine, basically; the latter is for quad-aligned arguments.
71 *
72 * The system call argument count and code from ptrace() already
73 * account for these, but we need to skip over the first argument.
74 */
75 reg = 0;
76 switch (regs.r_global[1]) {
77 case SYS_syscall:
78 case SYS___syscall:
79 reg = 1;
80 break;
81 }
82
83 for (i = 0; i < narg && reg < 6; i++, reg++)
84 cs->args[i] = regs.r_out[reg];
85 if (narg > i) {
86 iorequest.piod_op = PIOD_READ_D;
87 iorequest.piod_offs = (void *)(regs.r_out[6] + SPOFF +
88 offsetof(struct frame, fr_pad[6]));
89 iorequest.piod_addr = &cs->args[i];
90 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
91 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
92 if (iorequest.piod_len == 0)
93 return (-1);
94 }
95
96 return (0);
97 }
98
99 static int
sparc64_fetch_retval(struct trussinfo * trussinfo,long * retval,int * errorp)100 sparc64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
101 {
102 struct reg regs;
103 lwpid_t tid;
104
105 tid = trussinfo->curthread->tid;
106 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
107 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
108 return (-1);
109 }
110
111 retval[0] = regs.r_out[0];
112 retval[1] = regs.r_out[1];
113 *errorp = !!(regs.r_tstate & TSTATE_XCC_C);
114 return (0);
115 }
116
117 static struct procabi sparc64_freebsd = {
118 "FreeBSD ELF64",
119 syscallnames,
120 nitems(syscallnames),
121 sparc64_fetch_args,
122 sparc64_fetch_retval
123 };
124
125 PROCABI(sparc64_freebsd);
126