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libs/bsd: implemented dl_iterate_phdr
dl_iterate_phdr now fills the first four fields of
struct dl_phdr_info. The last four fields remain
unimplemented, as it requires help from the
runtime_loader.
Change-Id: Id96a7c7ac05633a71b9fb62c98b3a40f7d4f255b
Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
(cherry picked from commit 908107a15f
)
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5456
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0e96df5264
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@ -10,6 +10,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
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SharedLibrary [ MultiArchDefaultGristFiles libbsd.so ] :
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SharedLibrary [ MultiArchDefaultGristFiles libbsd.so ] :
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daemon.c
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daemon.c
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dl_iterate_phdr.c
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err.c
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err.c
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explicit_bzero.c
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explicit_bzero.c
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fgetln.c
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fgetln.c
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61
src/libs/bsd/dl_iterate_phdr.c
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61
src/libs/bsd/dl_iterate_phdr.c
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@ -0,0 +1,61 @@
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/*
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* Copyright 2022, Haiku, Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Trung Nguyen, trungnt282910@gmail.com
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*/
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#include <kernel/image.h>
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#include <link.h>
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#include <stddef.h>
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#if B_HAIKU_32_BIT
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typedef Elf32_Ehdr Elf_Ehdr;
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#elif B_HAIKU_64_BIT
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typedef Elf64_Ehdr Elf_Ehdr;
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#endif
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// While get_next_image_info does not return the address of
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// the ELF header, it does return the first page of the image's
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// text segment (defined by runtime_loader as the first loaded page
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// with read-only protection). For most images produced by
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// normal compilers, including Haiku ELF files, the file header
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// is always loaded at the beginning of the text segment.
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//
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// We can therefore take advantage of this fact and populate
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// struct dl_phdr_info.
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int
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dl_iterate_phdr(int (*callback)(struct dl_phdr_info* info, size_t size, void* data), void* data)
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{
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image_info info;
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int32 cookie = 0;
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int status;
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struct dl_phdr_info phdr_info;
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while (get_next_image_info(0, &cookie, &info) == B_OK) {
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const Elf_Ehdr* header = (const Elf_Ehdr*)info.text;
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// Check for the special commpage info (which is not an ELF image),
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// and also guard against any maliciously crafted file which
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// does not load its header in memory.
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if (!IS_ELF(*header))
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continue;
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phdr_info.dlpi_addr = (Elf_Addr)info.text;
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phdr_info.dlpi_name = info.name;
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phdr_info.dlpi_phnum = header->e_phnum;
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phdr_info.dlpi_phdr = (const Elf_Phdr*)((const char*)info.text + header->e_phoff);
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status = callback(&phdr_info, sizeof(phdr_info), data);
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if (status != 0)
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return status;
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}
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return 0;
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}
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