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lib/csu/amd64/reloc.c
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/*- | |||||
* Copyright (c) 2018 The FreeBSD Foundation | |||||
* | |||||
* This software was developed by Konstantin Belousov <kib@FreeBSD.org> | |||||
markj: I believe we can omit "All rights reserved" now. | |||||
Done Inline ActionsThis is what mandated by the contract I have signed with FF. kib: This is what mandated by the contract I have signed with FF. | |||||
Done Inline ActionsEventually the Foundation contracts will be updated or amended, but the All rights reserved. text can indeed be removed from Foundation copyright templates. emaste: Eventually the Foundation contracts will be updated or amended, but the //All rights reserved. | |||||
* 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. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* 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> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <machine/specialreg.h> | |||||
#include <machine/cpufunc.h> | |||||
static void | |||||
crt1_handle_rela(const Elf_Rela *r) | |||||
{ | |||||
Elf_Addr *ptr, *where, target; | |||||
u_int p[4]; | |||||
uint32_t cpu_feature, cpu_feature2; | |||||
uint32_t cpu_stdext_feature, cpu_stdext_feature2; | |||||
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; | |||||
} | |||||
switch (ELF_R_TYPE(r->r_info)) { | |||||
case R_X86_64_IRELATIVE: | |||||
ptr = (Elf_Addr *)r->r_addend; | |||||
where = (Elf_Addr *)r->r_offset; | |||||
target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, | |||||
markjUnsubmitted Not Done Inline ActionsHow can this work with a debugger that wishes to find the resolved address of an ifunc? I peeked at glibc and they seem to avoid passing arguments to the resolver somehow. markj: How can this work with a debugger that wishes to find the resolved address of an ifunc? I… | |||||
kibAuthorUnsubmitted Done Inline ActionsWhy would debugger require that ? What matter is the address of the function which is written into the call instruction, not the return value from the ifunc resolver. If really wanted, debugger can reconstruct the args. kib: Why would debugger require that ? What matter is the address of the function which is written… | |||||
uint32_t))ptr)(cpu_feature, cpu_feature2, | |||||
cpu_stdext_feature, cpu_stdext_feature2); | |||||
*where = target; | |||||
break; | |||||
} | |||||
} |
I believe we can omit "All rights reserved" now.