Commit | Line | Data |
---|---|---|
b7150b71 | 1 | #!/bin/bash |
b7cdc182 | 2 | # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
b75d00c4 MD |
3 | |
4 | # example usage: | |
644d6e9c | 5 | # lttng-get-syscall-inout.sh table-syscall-inout.txt select 1 |
b75d00c4 | 6 | |
9497697f | 7 | ARCH_NAME=$1 |
b75d00c4 | 8 | SYSCALL_NAME=$2 |
6ae73da4 MJ |
9 | NB_ARGS=$3 |
10 | ARG_NR=$4 | |
2879dbbc | 11 | TMPFILE=$(mktemp) |
9497697f | 12 | GENERIC_INOUT_DESCRIPTION_FILE="$(dirname "$0")/table-syscall-inout.txt" |
2879dbbc MJ |
13 | |
14 | # Delete temp file on exit | |
15 | trap 'rm -f "$TMPFILE"' EXIT | |
16 | ||
b03cf820 | 17 | if [ "${GENERIC_INOUT_DESCRIPTION_FILE}" = "" ]; then |
2879dbbc | 18 | echo "Error: Please specify input file name as first argument" >&2 |
b75d00c4 MD |
19 | exit 1 |
20 | fi | |
21 | ||
b03cf820 | 22 | if [ "${SYSCALL_NAME}" = "" ]; then |
2879dbbc | 23 | echo "Error: Please specify system call name as second argument" >&2 |
b75d00c4 MD |
24 | exit 1 |
25 | fi | |
26 | ||
b03cf820 | 27 | if [[ "${ARG_NR}" = "" || ${ARG_NR} == 0 ]]; then |
2879dbbc | 28 | echo "Error: Please specify argument number larger than 0 as third argument" >&2 |
b75d00c4 MD |
29 | exit 1 |
30 | fi | |
31 | ||
9497697f JG |
32 | # Search for the in/out description of a syscall. This function attempts to find |
33 | # a matching description in the per-architecture description override file (if it exists) | |
34 | # and falls back to the generic description file otherwise. | |
35 | # | |
36 | # Returns 0 if a description was found and written to the output file, 1 otherwise. | |
37 | function write_inout_description () | |
38 | { | |
39 | local arch_name=$1 | |
40 | local syscall_name=$2 | |
6ae73da4 MJ |
41 | local nb_args=$3 |
42 | local output_file=$4 | |
9497697f | 43 | local description_files=("$(dirname "$0")/table-syscall-inout-${arch_name}-override.txt" "$GENERIC_INOUT_DESCRIPTION_FILE") |
b03cf820 | 44 | local match_count |
9497697f | 45 | |
b03cf820 | 46 | for file in "${description_files[@]}"; do |
9497697f JG |
47 | if [ ! -f "$file" ]; then |
48 | continue | |
49 | fi | |
50 | ||
51 | # Look for the syscall's in/out description | |
b03cf820 | 52 | grep "^syscall ${syscall_name} " "${file}" > "${output_file}" || true |
9497697f JG |
53 | |
54 | # Error out if we got more than one syscall | |
b03cf820 | 55 | match_count=$(wc -l < "${output_file}") |
9497697f JG |
56 | if [ "${match_count}" -gt 1 ]; then |
57 | # Fatal error; invalid description file | |
b03cf820 | 58 | echo "Error: more than one system call match for ${SYSCALL_NAME}" >&2 |
9497697f JG |
59 | exit 1 |
60 | elif [ "${match_count}" -eq 1 ]; then | |
6ae73da4 MJ |
61 | if ! grep -q "^syscall ${syscall_name} nbargs ${nb_args}" "${output_file}"; then |
62 | echo "Error: number of arguments doesn't match for ${SYSCALL_NAME}" >&2 | |
63 | exit 1 | |
64 | fi | |
9497697f JG |
65 | # Description found |
66 | return 0 | |
67 | fi | |
68 | done | |
69 | ||
70 | return 1 | |
71 | } | |
72 | ||
2879dbbc MJ |
73 | # Abort on error and undefined variable |
74 | set -eu | |
75 | ||
b75d00c4 | 76 | |
2879dbbc | 77 | # Default to sc_inout for unknown syscalls |
6ae73da4 | 78 | if ! write_inout_description "$ARCH_NAME" "$SYSCALL_NAME" "$NB_ARGS" "$TMPFILE"; then |
2879dbbc | 79 | echo "Warning: no match for syscall '${SYSCALL_NAME}', set to 'inout'" >&2 |
b75d00c4 MD |
80 | # no match, default to inout |
81 | echo "sc_inout" | |
82 | exit 0 | |
83 | fi | |
84 | ||
2879dbbc MJ |
85 | # Get the number of argument |
86 | SC_ARGS=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) .*/\2/g' "${TMPFILE}") | |
b75d00c4 | 87 | |
2879dbbc | 88 | if [ "${ARG_NR}" -gt "${SC_ARGS}" ]; then |
b03cf820 | 89 | echo "Error: argument number (${ARG_NR}) for ${SYSCALL_NAME} is larger than number of syscall arguments (${SC_ARGS})" >&2 |
b75d00c4 MD |
90 | exit 1 |
91 | fi | |
92 | ||
2879dbbc MJ |
93 | if [ "${ARG_NR}" == 1 ]; then |
94 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: (\([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
95 | fi |
96 | ||
2879dbbc MJ |
97 | if [ "${ARG_NR}" == 2 ]; then |
98 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
99 | fi |
100 | ||
2879dbbc MJ |
101 | if [ "${ARG_NR}" == 3 ]; then |
102 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
103 | fi |
104 | ||
2879dbbc MJ |
105 | if [ "${ARG_NR}" == 4 ]; then |
106 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
107 | fi |
108 | ||
2879dbbc MJ |
109 | if [ "${ARG_NR}" == 5 ]; then |
110 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
111 | fi |
112 | ||
2879dbbc MJ |
113 | if [ "${ARG_NR}" == 6 ]; then |
114 | SC_ARG_TYPE=$(sed 's/^syscall \([^ ]*\) nbargs \([^ ]*\) rw: ([^,]*, [^,]*, [^,]*, [^,]*, [^,]*, \([^,)]*\).*/\3/g' "${TMPFILE}") | |
b75d00c4 MD |
115 | fi |
116 | ||
b75d00c4 | 117 | |
2879dbbc | 118 | if [ "${SC_ARG_TYPE}" = "r" ]; then |
b75d00c4 MD |
119 | echo "sc_in" |
120 | fi | |
2879dbbc | 121 | if [ "${SC_ARG_TYPE}" = "w" ]; then |
b75d00c4 MD |
122 | echo "sc_out" |
123 | fi | |
2879dbbc | 124 | if [ "${SC_ARG_TYPE}" = "rw" ]; then |
b75d00c4 MD |
125 | echo "sc_inout" |
126 | fi | |
127 | ||
2879dbbc | 128 | # EOF |