Commit | Line | Data |
---|---|---|
bf41f30d NC |
1 | dnl |
2 | dnl GCC_CET_FLAGS | |
3 | dnl (SHELL-CODE_HANDLER) | |
4 | dnl | |
5 | AC_DEFUN([GCC_CET_FLAGS],[dnl | |
37f980dc SM |
6 | GCC_ENABLE(cet, no, ,[enable Intel CET in target libraries], |
7 | permit yes|no|auto) | |
552d4da4 L |
8 | AC_MSG_CHECKING([for CET support]) |
9 | ||
bf41f30d NC |
10 | case "$host" in |
11 | i[[34567]]86-*-linux* | x86_64-*-linux*) | |
12 | case "$enable_cet" in | |
37f980dc | 13 | auto) |
552d4da4 L |
14 | # Check if target supports multi-byte NOPs |
15 | # and if assembler supports CET insn. | |
bf41f30d NC |
16 | AC_COMPILE_IFELSE( |
17 | [AC_LANG_PROGRAM( | |
18 | [], | |
552d4da4 L |
19 | [ |
20 | #if !defined(__SSE2__) | |
21 | #error target does not support multi-byte NOPs | |
22 | #else | |
23 | asm ("setssbsy"); | |
24 | #endif | |
25 | ])], | |
bf41f30d NC |
26 | [enable_cet=yes], |
27 | [enable_cet=no]) | |
28 | ;; | |
29 | yes) | |
30 | # Check if assembler supports CET. | |
31 | AC_COMPILE_IFELSE( | |
32 | [AC_LANG_PROGRAM( | |
33 | [], | |
34 | [asm ("setssbsy");])], | |
35 | [], | |
36 | [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) | |
37 | ;; | |
38 | esac | |
39 | ;; | |
40 | *) | |
41 | enable_cet=no | |
42 | ;; | |
43 | esac | |
44 | if test x$enable_cet = xyes; then | |
37f980dc | 45 | $1="-fcf-protection -mshstk" |
552d4da4 L |
46 | AC_MSG_RESULT([yes]) |
47 | else | |
48 | AC_MSG_RESULT([no]) | |
bf41f30d NC |
49 | fi |
50 | ]) | |
87c66b2e L |
51 | |
52 | dnl | |
53 | dnl GCC_CET_HOST_FLAGS | |
54 | dnl (SHELL-CODE_HANDLER) | |
55 | dnl | |
56 | AC_DEFUN([GCC_CET_HOST_FLAGS],[dnl | |
57 | GCC_ENABLE(cet, auto, ,[enable Intel CET in host libraries], | |
58 | permit yes|no|auto) | |
59 | AC_MSG_CHECKING([for CET support]) | |
60 | ||
61 | case "$host" in | |
62 | i[[34567]]86-*-linux* | x86_64-*-linux*) | |
63 | may_have_cet=yes | |
64 | save_CFLAGS="$CFLAGS" | |
65 | CFLAGS="$CFLAGS -fcf-protection" | |
66 | case "$enable_cet" in | |
67 | auto) | |
68 | # Check if target supports multi-byte NOPs | |
69 | # and if assembler supports CET insn. | |
70 | AC_COMPILE_IFELSE( | |
71 | [AC_LANG_PROGRAM( | |
72 | [], | |
73 | [ | |
74 | #if !defined(__SSE2__) | |
75 | #error target does not support multi-byte NOPs | |
76 | #else | |
77 | asm ("setssbsy"); | |
78 | #endif | |
79 | ])], | |
80 | [enable_cet=yes], | |
81 | [enable_cet=no]) | |
82 | ;; | |
83 | yes) | |
84 | # Check if assembler supports CET. | |
85 | AC_COMPILE_IFELSE( | |
86 | [AC_LANG_PROGRAM( | |
87 | [], | |
88 | [asm ("setssbsy");])], | |
89 | [], | |
90 | [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) | |
91 | ;; | |
92 | esac | |
93 | CFLAGS="$save_CFLAGS" | |
94 | ;; | |
95 | *) | |
96 | may_have_cet=no | |
97 | enable_cet=no | |
98 | ;; | |
99 | esac | |
100 | ||
101 | save_CFLAGS="$CFLAGS" | |
102 | CFLAGS="$CFLAGS -fcf-protection=none" | |
103 | save_LDFLAGS="$LDFLAGS" | |
104 | LDFLAGS="$LDFLAGS -Wl,-z,ibt,-z,shstk" | |
105 | if test x$may_have_cet = xyes; then | |
106 | # Check whether -fcf-protection=none -Wl,-z,ibt,-z,shstk work. | |
107 | AC_TRY_LINK( | |
108 | [],[return 0;], | |
109 | [may_have_cet=yes], | |
110 | [may_have_cet=no]) | |
111 | fi | |
112 | ||
113 | if test x$may_have_cet = xyes; then | |
90d00bbd L |
114 | if test x$cross_compiling = xno; then |
115 | AC_TRY_RUN([ | |
87c66b2e L |
116 | static void |
117 | foo (void) | |
118 | { | |
119 | } | |
120 | ||
121 | static void | |
122 | __attribute__ ((noinline, noclone)) | |
123 | xxx (void (*f) (void)) | |
124 | { | |
125 | f (); | |
126 | } | |
127 | ||
128 | static void | |
129 | __attribute__ ((noinline, noclone)) | |
130 | bar (void) | |
131 | { | |
132 | xxx (foo); | |
133 | } | |
134 | ||
135 | int | |
136 | main () | |
137 | { | |
138 | bar (); | |
139 | return 0; | |
140 | } | |
90d00bbd L |
141 | ], |
142 | [have_cet=no], | |
143 | [have_cet=yes]) | |
144 | if test x$enable_cet = xno -a x$have_cet = xyes; then | |
145 | AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host]) | |
146 | fi | |
87c66b2e | 147 | fi |
90d00bbd L |
148 | else |
149 | # Enable CET in cross compiler if possible so that it will run on both | |
150 | # CET and non-CET hosts. | |
151 | have_cet=yes | |
87c66b2e L |
152 | fi |
153 | if test x$enable_cet = xyes; then | |
154 | $1="-fcf-protection" | |
155 | AC_MSG_RESULT([yes]) | |
156 | else | |
157 | AC_MSG_RESULT([no]) | |
158 | fi | |
159 | CFLAGS="$save_CFLAGS" | |
160 | LDFLAGS="$save_LDFLAGS" | |
161 | ]) |