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On s390, the current prelink undo code in elf_machine_lazy_rel() has the requirement, that the plt stubs use the first got slots after the 3 reserved ones. In case of undoing prelink, the plt got slots are reset to the correct addresses whithin the corresponding plt-stub. Therefore the address is calculated by the address of the first plt-stub-address which was written by prelink (see l->l_mach.plt) to got[1] and index of current relocation multiplied with 32 (=size of one plt slot). The index was calculated with ¤t-got-slot - &got[3]. This patch removes the requirement, that the plt-got-slots are starting at got[3]. The index is now calculated with ¤t-reloc - &reloc[0]. The first struct Elf64_Rela is stored at DT_JMPREL. This patch is needed to prepare for partial relro support. Ulrich Weigand suggested this approach to use DT_JMPREL - Thanks. ChangeLog: * sysdeps/s390/linkmap.h (struct link_map_machine): Remove member gotplt and add member jmprel. * sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup): Setup member jmprel with DT_JMPREL instead of gotplt with &got[3]. (elf_machine_lazy_rel): Calculate address with reloc and jmprel. * sysdeps/s390/s390-64/dl-machine.h: Likewise.
14 lines
334 B
C
14 lines
334 B
C
#if __WORDSIZE == 64
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struct link_map_machine
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{
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Elf64_Addr plt; /* Address of .plt + 0x2e */
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const Elf64_Rela *jmprel; /* Address of first JMP_SLOT reloc */
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};
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#else
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struct link_map_machine
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{
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Elf32_Addr plt; /* Address of .plt + 0x2c */
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const Elf32_Rela *jmprel; /* Address of first JMP_SLOT reloc */
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};
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#endif
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