| 1 | #!/bin/bash |
| 2 | # SPDX-License-Identifier: GPL-2.0-only |
| 3 | # Translate the bits making up a GFP mask |
| 4 | # (c) 2009, Mel Gorman <[email protected]> |
| 5 | SOURCE= |
| 6 | GFPMASK=none |
| 7 | |
| 8 | # Helper function to report failures and exit |
| 9 | die() { |
| 10 | echo ERROR: $@ |
| 11 | if [ "$TMPFILE" != "" ]; then |
| 12 | rm -f $TMPFILE |
| 13 | fi |
| 14 | exit -1 |
| 15 | } |
| 16 | |
| 17 | usage() { |
| 18 | echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask" |
| 19 | exit 0 |
| 20 | } |
| 21 | |
| 22 | # Parse command-line arguments |
| 23 | while [ $# -gt 0 ]; do |
| 24 | case $1 in |
| 25 | --source) |
| 26 | SOURCE=$2 |
| 27 | shift 2 |
| 28 | ;; |
| 29 | -h) |
| 30 | usage |
| 31 | ;; |
| 32 | --help) |
| 33 | usage |
| 34 | ;; |
| 35 | *) |
| 36 | GFPMASK=$1 |
| 37 | shift |
| 38 | ;; |
| 39 | esac |
| 40 | done |
| 41 | |
| 42 | # Guess the kernel source directory if it's not set. Preference is in order of |
| 43 | # o current directory |
| 44 | # o /usr/src/linux |
| 45 | if [ "$SOURCE" = "" ]; then |
| 46 | if [ -r "/usr/src/linux/Makefile" ]; then |
| 47 | SOURCE=/usr/src/linux |
| 48 | fi |
| 49 | if [ -r "`pwd`/Makefile" ]; then |
| 50 | SOURCE=`pwd` |
| 51 | fi |
| 52 | fi |
| 53 | |
| 54 | # Confirm that a source directory exists |
| 55 | if [ ! -r "$SOURCE/Makefile" ]; then |
| 56 | die "Could not locate kernel source directory or it is invalid" |
| 57 | fi |
| 58 | |
| 59 | # Confirm that a GFP mask has been specified |
| 60 | if [ "$GFPMASK" = "none" ]; then |
| 61 | usage |
| 62 | fi |
| 63 | |
| 64 | # Extract GFP flags from the kernel source |
| 65 | TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || exit 1 |
| 66 | |
| 67 | echo Source: $SOURCE |
| 68 | echo Parsing: $GFPMASK |
| 69 | |
| 70 | ( |
| 71 | cat <<EOF |
| 72 | #include <stdint.h> |
| 73 | #include <stdio.h> |
| 74 | |
| 75 | // Try to fool compiler.h into not including extra stuff |
| 76 | #define __ASSEMBLY__ 1 |
| 77 | |
| 78 | #include <generated/autoconf.h> |
| 79 | #include <linux/gfp_types.h> |
| 80 | |
| 81 | static const char *masks[] = { |
| 82 | EOF |
| 83 | |
| 84 | sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,.*$/\1/p' $SOURCE/include/linux/gfp_types.h | |
| 85 | while read b; do |
| 86 | cat <<EOF |
| 87 | #if defined($b) && ($b > 0) |
| 88 | [${b}_BIT] = "$b", |
| 89 | #endif |
| 90 | EOF |
| 91 | done |
| 92 | |
| 93 | cat <<EOF |
| 94 | }; |
| 95 | |
| 96 | int main(int argc, char *argv[]) |
| 97 | { |
| 98 | unsigned long long mask = $GFPMASK; |
| 99 | |
| 100 | for (int i = 0; i < sizeof(mask) * 8; i++) { |
| 101 | unsigned long long bit = 1ULL << i; |
| 102 | if (mask & bit) |
| 103 | printf("\t%-25s0x%llx\n", |
| 104 | (i < ___GFP_LAST_BIT && masks[i]) ? |
| 105 | masks[i] : "*** INVALID ***", |
| 106 | bit); |
| 107 | } |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | EOF |
| 112 | ) > $TMPFILE |
| 113 | |
| 114 | ${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/include $TMPFILE && ${TMPFILE}.bin |
| 115 | |
| 116 | rm -f $TMPFILE ${TMPFILE}.bin |
| 117 | |
| 118 | exit 0 |