Author: kib
Date: Mon Oct 29 23:59:26 2018
New Revision: 339897
URL: https://svnweb.freebsd.org/changeset/base/339897
Log:
Remove rtld use of libc amd64_set_fsbase().
One less non-trivial dependency of rtld on libc. Also,
amd64_set_fsbase() is to be converted to ifunc, which I do not want to
support inside rtld.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/libexec/rtld-elf/amd64/reloc.c
Modified: head/libexec/rtld-elf/amd64/reloc.c
==============================================================================
--- head/libexec/rtld-elf/amd64/reloc.c Mon Oct 29 23:56:39 2018
(r339896)
+++ head/libexec/rtld-elf/amd64/reloc.c Mon Oct 29 23:59:26 2018
(r339897)
@@ -35,8 +35,9 @@
#include <sys/param.h>
#include <sys/mman.h>
-#include <machine/sysarch.h>
#include <machine/cpufunc.h>
+#include <machine/specialreg.h>
+#include <machine/sysarch.h>
#include <dlfcn.h>
#include <err.h>
@@ -495,17 +496,26 @@ pre_init(void)
}
+int __getosreldate(void);
+
void
allocate_initial_tls(Obj_Entry *objs)
{
- /*
- * Fix the size of the static TLS block by using the maximum
- * offset allocated so far and adding a bit for dynamic modules to
- * use.
- */
- tls_static_space = tls_last_offset + RTLD_STATIC_TLS_EXTRA;
- amd64_set_fsbase(allocate_tls(objs, 0,
- 3*sizeof(Elf_Addr), sizeof(Elf_Addr)));
+ void *addr;
+
+ /*
+ * Fix the size of the static TLS block by using the maximum
+ * offset allocated so far and adding a bit for dynamic
+ * modules to use.
+ */
+ tls_static_space = tls_last_offset + RTLD_STATIC_TLS_EXTRA;
+
+ addr = allocate_tls(objs, 0, 3 * sizeof(Elf_Addr), sizeof(Elf_Addr));
+ if (__getosreldate() >= P_OSREL_WRFSBASE &&
+ (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0)
+ wrfsbase((uintptr_t)addr);
+ else
+ sysarch(AMD64_SET_FSBASE, &addr);
}
void *__tls_get_addr(tls_index *ti)
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