forked from rpms/glibc
51 lines
1.7 KiB
Diff
51 lines
1.7 KiB
Diff
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commit edb9a76e3008725e9dc035d38a58e849a3bde0f1
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Sun Apr 14 08:24:51 2024 +0200
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powerpc: Fix ld.so address determination for PCREL mode (bug 31640)
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This seems to have stopped working with some GCC 14 versions,
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which clobber r2. With other compilers, the kernel-provided
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r2 value is still available at this point.
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Reviewed-by: Peter Bergner <bergner@linux.ibm.com>
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(cherry picked from commit 14e56bd4ce15ac2d1cc43f762eb2e6b83fec1afe)
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diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h
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index c6682f3445615636..2b6f5d2b08cb10b8 100644
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--- a/sysdeps/powerpc/powerpc64/dl-machine.h
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+++ b/sysdeps/powerpc/powerpc64/dl-machine.h
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@@ -78,6 +78,7 @@ elf_host_tolerates_class (const Elf64_Ehdr *ehdr)
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static inline Elf64_Addr
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elf_machine_load_address (void) __attribute__ ((const));
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+#ifndef __PCREL__
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static inline Elf64_Addr
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elf_machine_load_address (void)
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{
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@@ -105,6 +106,24 @@ elf_machine_dynamic (void)
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/* Then subtract off the load address offset. */
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return runtime_dynamic - elf_machine_load_address() ;
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}
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+#else /* __PCREL__ */
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+/* In PCREL mode, r2 may have been clobbered. Rely on relative
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+ relocations instead. */
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+
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+static inline ElfW(Addr)
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+elf_machine_load_address (void)
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+{
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+ extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
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+ return (ElfW(Addr)) &__ehdr_start;
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+}
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+
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+static inline ElfW(Addr)
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+elf_machine_dynamic (void)
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+{
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+ extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
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+ return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
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+}
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+#endif /* __PCREL__ */
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/* The PLT uses Elf64_Rela relocs. */
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#define elf_machine_relplt elf_machine_rela
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