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Add IFUNC support for arm64 and IRELATIVE reloc

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There are number of changes in the way IFUNC related relocations are done:
 1. IRELATIVE relocations are now supported for x86/x86_64 and arm64.
 2. IFUNC relocations are now relying on static linker to generate
    them in correct order - this removes necessety of additional
    relocation pass for ifuncs.
 3. Related to 2: rela?.dyn relocations are preformed before .plt ones.
 4. Ifunc are resolved on symbol lookup this approach allowed to avoid
    mprotect(PROT_WRITE) call on r-x program segments.

Bug: 17399706
Bug: 17177284
Change-Id: I414dd3e82bd47cc03442c5dfc7c279949aec51ed
This commit is contained in:
Dmitriy Ivanov
2014-09-11 15:16:03 -07:00
parent c71483c0b3
commit 9aea164457
10 changed files with 95 additions and 134 deletions
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libc/arch-x86/include/machine/elf_machdep.h
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@@ -59,5 +59,6 @@
#define R_386_TLS_GOTDESC 39
#define R_386_TLS_DESC_CALL 40
#define R_386_TLS_DESC 41
#define R_386_IRELATIVE 42
#define R_TYPE(name) __CONCAT(R_386_,name)