diff options
Diffstat (limited to 'lib/libc/csu/i386/reloc.c')
| -rw-r--r-- | lib/libc/csu/i386/reloc.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/lib/libc/csu/i386/reloc.c b/lib/libc/csu/i386/reloc.c new file mode 100644 index 000000000000..7097f58d8f26 --- /dev/null +++ b/lib/libc/csu/i386/reloc.c @@ -0,0 +1,90 @@ +/*- + * Copyright (c) 2018 The FreeBSD Foundation + * + * This software was developed by Konstantin Belousov <kib@FreeBSD.org> + * under sponsorship from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> + +#include <machine/specialreg.h> +#include <machine/cpufunc.h> + +static uint32_t cpu_feature, cpu_feature2; +static uint32_t cpu_stdext_feature, cpu_stdext_feature2; + +static void +ifunc_init(const Elf_Auxinfo *aux __unused) +{ + u_int cpuid_supported, p[4]; + + __asm __volatile( + " pushfl\n" + " popl %%eax\n" + " movl %%eax,%%ecx\n" + " xorl $0x200000,%%eax\n" + " pushl %%eax\n" + " popfl\n" + " pushfl\n" + " popl %%eax\n" + " xorl %%eax,%%ecx\n" + " je 1f\n" + " movl $1,%0\n" + " jmp 2f\n" + "1: movl $0,%0\n" + "2:\n" + : "=r" (cpuid_supported) : : "eax", "ecx", "cc"); + if (cpuid_supported) { + do_cpuid(1, p); + cpu_feature = p[3]; + cpu_feature2 = p[2]; + do_cpuid(0, p); + if (p[0] >= 7) { + cpuid_count(7, 0, p); + cpu_stdext_feature = p[1]; + cpu_stdext_feature2 = p[2]; + } else { + cpu_stdext_feature = 0; + cpu_stdext_feature2 = 0; + } + } else { + cpu_feature = 0; + cpu_feature2 = 0; + cpu_stdext_feature = 0; + cpu_stdext_feature2 = 0; + } +} + +static void +crt1_handle_rel(const Elf_Rel *r) +{ + Elf_Addr *where, target; + + switch (ELF_R_TYPE(r->r_info)) { + case R_386_IRELATIVE: + where = (Elf_Addr *)r->r_offset; + target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, + uint32_t))*where)(cpu_feature, cpu_feature2, + cpu_stdext_feature, cpu_stdext_feature2); + *where = target; + break; + } +} |