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 | |
56770bda | 6 | GCC_ENABLE(cet, auto, ,[enable Intel CET in target libraries], |
37f980dc | 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. | |
56770bda L |
16 | save_CFLAGS="$CFLAGS" |
17 | CFLAGS="$CFLAGS -fcf-protection" | |
bf41f30d NC |
18 | AC_COMPILE_IFELSE( |
19 | [AC_LANG_PROGRAM( | |
20 | [], | |
552d4da4 L |
21 | [ |
22 | #if !defined(__SSE2__) | |
23 | #error target does not support multi-byte NOPs | |
24 | #else | |
25 | asm ("setssbsy"); | |
26 | #endif | |
27 | ])], | |
bf41f30d NC |
28 | [enable_cet=yes], |
29 | [enable_cet=no]) | |
56770bda | 30 | CFLAGS="$save_CFLAGS" |
bf41f30d NC |
31 | ;; |
32 | yes) | |
33 | # Check if assembler supports CET. | |
34 | AC_COMPILE_IFELSE( | |
35 | [AC_LANG_PROGRAM( | |
36 | [], | |
37 | [asm ("setssbsy");])], | |
38 | [], | |
39 | [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) | |
40 | ;; | |
41 | esac | |
42 | ;; | |
43 | *) | |
44 | enable_cet=no | |
45 | ;; | |
46 | esac | |
47 | if test x$enable_cet = xyes; then | |
37f980dc | 48 | $1="-fcf-protection -mshstk" |
552d4da4 L |
49 | AC_MSG_RESULT([yes]) |
50 | else | |
51 | AC_MSG_RESULT([no]) | |
bf41f30d NC |
52 | fi |
53 | ]) | |
87c66b2e L |
54 | |
55 | dnl | |
56 | dnl GCC_CET_HOST_FLAGS | |
57 | dnl (SHELL-CODE_HANDLER) | |
58 | dnl | |
59 | AC_DEFUN([GCC_CET_HOST_FLAGS],[dnl | |
60 | GCC_ENABLE(cet, auto, ,[enable Intel CET in host libraries], | |
61 | permit yes|no|auto) | |
62 | AC_MSG_CHECKING([for CET support]) | |
63 | ||
64 | case "$host" in | |
65 | i[[34567]]86-*-linux* | x86_64-*-linux*) | |
66 | may_have_cet=yes | |
67 | save_CFLAGS="$CFLAGS" | |
68 | CFLAGS="$CFLAGS -fcf-protection" | |
69 | case "$enable_cet" in | |
70 | auto) | |
71 | # Check if target supports multi-byte NOPs | |
72 | # and if assembler supports CET insn. | |
73 | AC_COMPILE_IFELSE( | |
74 | [AC_LANG_PROGRAM( | |
75 | [], | |
76 | [ | |
77 | #if !defined(__SSE2__) | |
78 | #error target does not support multi-byte NOPs | |
79 | #else | |
80 | asm ("setssbsy"); | |
81 | #endif | |
82 | ])], | |
83 | [enable_cet=yes], | |
84 | [enable_cet=no]) | |
85 | ;; | |
86 | yes) | |
87 | # Check if assembler supports CET. | |
88 | AC_COMPILE_IFELSE( | |
89 | [AC_LANG_PROGRAM( | |
90 | [], | |
91 | [asm ("setssbsy");])], | |
92 | [], | |
93 | [AC_MSG_ERROR([assembler with CET support is required for --enable-cet])]) | |
94 | ;; | |
95 | esac | |
96 | CFLAGS="$save_CFLAGS" | |
97 | ;; | |
98 | *) | |
99 | may_have_cet=no | |
100 | enable_cet=no | |
101 | ;; | |
102 | esac | |
103 | ||
104 | save_CFLAGS="$CFLAGS" | |
105 | CFLAGS="$CFLAGS -fcf-protection=none" | |
106 | save_LDFLAGS="$LDFLAGS" | |
107 | LDFLAGS="$LDFLAGS -Wl,-z,ibt,-z,shstk" | |
108 | if test x$may_have_cet = xyes; then | |
109 | # Check whether -fcf-protection=none -Wl,-z,ibt,-z,shstk work. | |
110 | AC_TRY_LINK( | |
111 | [],[return 0;], | |
112 | [may_have_cet=yes], | |
113 | [may_have_cet=no]) | |
114 | fi | |
115 | ||
116 | if test x$may_have_cet = xyes; then | |
90d00bbd L |
117 | if test x$cross_compiling = xno; then |
118 | AC_TRY_RUN([ | |
87c66b2e L |
119 | static void |
120 | foo (void) | |
121 | { | |
122 | } | |
123 | ||
124 | static void | |
125 | __attribute__ ((noinline, noclone)) | |
126 | xxx (void (*f) (void)) | |
127 | { | |
128 | f (); | |
129 | } | |
130 | ||
131 | static void | |
132 | __attribute__ ((noinline, noclone)) | |
133 | bar (void) | |
134 | { | |
135 | xxx (foo); | |
136 | } | |
137 | ||
138 | int | |
139 | main () | |
140 | { | |
141 | bar (); | |
142 | return 0; | |
143 | } | |
90d00bbd L |
144 | ], |
145 | [have_cet=no], | |
146 | [have_cet=yes]) | |
147 | if test x$enable_cet = xno -a x$have_cet = xyes; then | |
148 | AC_MSG_ERROR([Intel CET must be enabled on Intel CET enabled host]) | |
149 | fi | |
87c66b2e | 150 | fi |
90d00bbd L |
151 | else |
152 | # Enable CET in cross compiler if possible so that it will run on both | |
153 | # CET and non-CET hosts. | |
154 | have_cet=yes | |
87c66b2e L |
155 | fi |
156 | if test x$enable_cet = xyes; then | |
157 | $1="-fcf-protection" | |
158 | AC_MSG_RESULT([yes]) | |
159 | else | |
160 | AC_MSG_RESULT([no]) | |
161 | fi | |
162 | CFLAGS="$save_CFLAGS" | |
163 | LDFLAGS="$save_LDFLAGS" | |
164 | ]) |