1 /*-
2 * Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
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 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/ptrace.h>
31
32 #include <machine/psl.h>
33
34 #include <stdbool.h>
35 #include <stdio.h>
36 #include <sysdecode.h>
37
38 #include "truss.h"
39
40 static int
amd64_cloudabi32_fetch_args(struct trussinfo * trussinfo,unsigned int narg)41 amd64_cloudabi32_fetch_args(struct trussinfo *trussinfo, unsigned int narg)
42 {
43 struct current_syscall *cs;
44 struct ptrace_io_desc iorequest;
45 struct reg regs;
46 lwpid_t tid;
47
48 if (narg > 0) {
49 /* Fetch registers, containing the address of the arguments. */
50 tid = trussinfo->curthread->tid;
51 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) == -1) {
52 fprintf(trussinfo->outfile,
53 "-- CANNOT READ REGISTERS --\n");
54 return (-1);
55 }
56
57 /* Fetch arguments. They are already padded to 64 bits. */
58 cs = &trussinfo->curthread->cs;
59 iorequest.piod_op = PIOD_READ_D;
60 iorequest.piod_offs = (void *)regs.r_rcx;
61 iorequest.piod_addr = cs->args;
62 iorequest.piod_len = sizeof(cs->args[0]) * narg;
63 if (ptrace(PT_IO, tid, (caddr_t)&iorequest, 0) == -1 ||
64 iorequest.piod_len == 0)
65 return (-1);
66 }
67 return (0);
68 }
69
70 static int
amd64_cloudabi32_fetch_retval(struct trussinfo * trussinfo,long * retval,int * errorp)71 amd64_cloudabi32_fetch_retval(struct trussinfo *trussinfo, long *retval,
72 int *errorp)
73 {
74 struct ptrace_io_desc iorequest;
75 struct reg regs;
76 lwpid_t tid;
77
78 /* Fetch registers, containing the address of the return values. */
79 tid = trussinfo->curthread->tid;
80 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) == -1) {
81 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
82 return (-1);
83 }
84
85 if (regs.r_rax == 0) {
86 /* System call succeeded. Fetch return values. */
87 iorequest.piod_op = PIOD_READ_D;
88 iorequest.piod_offs = (void *)regs.r_rcx;
89 iorequest.piod_addr = retval;
90 iorequest.piod_len = sizeof(retval[0]) * 2;
91 if (ptrace(PT_IO, tid, (caddr_t)&iorequest, 0) == -1 ||
92 iorequest.piod_len == 0)
93 return (-1);
94 *errorp = 0;
95 } else {
96 /* System call failed. Set error. */
97 retval[0] = regs.r_rax;
98 *errorp = 1;
99 }
100 return (0);
101 }
102
103 static struct procabi amd64_cloudabi32 = {
104 "CloudABI ELF32",
105 SYSDECODE_ABI_CLOUDABI32,
106 amd64_cloudabi32_fetch_args,
107 amd64_cloudabi32_fetch_retval,
108 STAILQ_HEAD_INITIALIZER(amd64_cloudabi32.extra_syscalls),
109 { NULL }
110 };
111
112 PROCABI(amd64_cloudabi32);
113