summaryrefslogtreecommitdiffstats
path: root/trunk/testsuite/ifunc.h
diff options
context:
space:
mode:
Diffstat (limited to 'trunk/testsuite/ifunc.h')
-rw-r--r--trunk/testsuite/ifunc.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/trunk/testsuite/ifunc.h b/trunk/testsuite/ifunc.h
new file mode 100644
index 0000000..3593396
--- /dev/null
+++ b/trunk/testsuite/ifunc.h
@@ -0,0 +1,33 @@
+#ifndef PICKNO
+# define PICKNO 1
+#endif
+#if PICKNO == 2
+# define PICK(fn1, fn2) #fn2
+#else
+# define PICK(fn1, fn2) #fn1
+#endif
+#ifdef __x86_64__
+# define IFUNC_ASM(fn) "\tleaq " fn "(%rip), %rax\n\tretq\n"
+#elif defined __i386__
+# ifdef __PIC__
+# define IFUNC_ASM(fn) "\tcall 1f\n1:\tpopl %ecx\n" \
+ "\taddl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx\n" \
+ "\tleal " fn "@GOTOFF(%ecx), %eax\n\tret\n"
+# else
+# define IFUNC_ASM(fn) "\tmovl $" fn ", %eax\n\tret\n"
+# endif
+#else
+# error Architecture not supported
+#endif
+#define IFUNC(name, hidden, fn1, fn2) \
+extern __typeof (fn1) fn1 __attribute__((used)); \
+extern __typeof (fn2) fn2 __attribute__((used)); \
+extern __typeof (fn1) name; \
+asm (".globl " #name "\n" \
+ "\t" hidden " " #name "\n" \
+ "\t.type " #name ", @gnu_indirect_function\n" \
+ #name ":\n" \
+ IFUNC_ASM (PICK (fn1, fn2)) \
+ "\t.size " #name ", .-" #name "\n")
+#define IFUNC_LOCAL(name, fn1, fn2) IFUNC(name, ".hidden", fn1, fn2)
+#define IFUNC_GLOBAL(name, fn1, fn2) IFUNC(name, ".globl", fn1, fn2)