1 /*
2 * This file is part of ltrace.
3 * Copyright (C) 2008,2009 Juan Cespedes
4 * Copyright (C) 2006 Steve Fink
5 * Copyright (C) 2006 Ian Wienand
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23 #include "config.h"
24
25 #include <stdlib.h>
26 #include <stddef.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <signal.h>
30 #include <sys/ptrace.h>
31 #include <string.h>
32 #include <asm/ptrace_offsets.h>
33 #include <asm/rse.h>
34 #include <errno.h>
35
36 #include "proc.h"
37 #include "common.h"
38 #include "type.h"
39
40 /* What we think of as a bundle, ptrace thinks of it as two unsigned
41 * longs */
42 union bundle_t {
43 /* An IA64 instruction bundle has a 5 bit header describing the
44 * type of bundle, then 3 41 bit instructions
45 */
46 struct {
47 struct {
48 unsigned long template:5;
49 unsigned long slot0:41;
50 unsigned long bot_slot1:18;
51 } word0;
52 struct {
53 unsigned long top_slot1:23;
54 unsigned long slot2:41;
55 } word1;
56 } bitmap;
57 unsigned long code[2];
58 };
59
60 union cfm_t {
61 struct {
62 unsigned long sof:7;
63 unsigned long sol:7;
64 unsigned long sor:4;
65 unsigned long rrb_gr:7;
66 unsigned long rrb_fr:7;
67 unsigned long rrb_pr:6;
68 } cfm;
69 unsigned long value;
70 };
71
72 int
syscall_p(struct process * proc,int status,int * sysnum)73 syscall_p(struct process *proc, int status, int *sysnum)
74 {
75 if (WIFSTOPPED(status)
76 && WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
77 long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0);
78 if (l == -1 && errno)
79 return -1;
80 unsigned long slot = ((unsigned long)l >> 41) & 0x3;
81 unsigned long ip =
82 ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0);
83
84 /* r15 holds the system call number */
85 unsigned long r15 =
86 ptrace(PTRACE_PEEKUSER, proc->pid, PT_R15, 0);
87 unsigned long insn;
88
89 union bundle_t bundle;
90
91 /* On fault, the IP has moved forward to the next
92 * slot. If that is zero, then the actual place we
93 * broke was in the previous bundle, so wind back the
94 * IP.
95 */
96 if (slot == 0)
97 ip = ip - 16;
98 bundle.code[0] = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0);
99 bundle.code[1] = ptrace(PTRACE_PEEKTEXT, proc->pid, ip + 8, 0);
100
101 unsigned long bot = 0UL | bundle.bitmap.word0.bot_slot1;
102 unsigned long top = 0UL | bundle.bitmap.word1.top_slot1;
103
104 /* handle the rollback, slot 0 is actually slot 2 of
105 * the previous instruction (see above) */
106 switch (slot) {
107 case 0:
108 insn = bundle.bitmap.word1.slot2;
109 break;
110 case 1:
111 insn = bundle.bitmap.word0.slot0;
112 break;
113 case 2:
114 /* make sure we're shifting about longs */
115 insn = 0UL | bot | (top << 18UL);
116 break;
117 default:
118 printf("Ummm, can't find instruction slot?\n");
119 exit(1);
120 }
121
122 /* We need to support both the older break instruction
123 * type syscalls, and the new epc type ones.
124 *
125 * Bit 20 of the break constant is encoded in the "i"
126 * bit (bit 36) of the instruction, hence you should
127 * see 0x1000000000.
128 *
129 * An EPC call is just 0x1ffffffffff
130 */
131 if (insn == 0x1000000000 || insn == 0x1ffffffffff) {
132 *sysnum = r15;
133 if (proc->callstack_depth > 0 &&
134 proc->callstack[proc->callstack_depth - 1].is_syscall &&
135 proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) {
136 return 2;
137 }
138 return 1;
139 }
140 }
141 return 0;
142 }
143
144 void
get_arch_dep(struct process * proc)145 get_arch_dep(struct process *proc)
146 {
147 }
148