58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From 1e423dc297d10eb7ff25c829d2856ef12fc81d77 Mon Sep 17 00:00:00 2001
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From: Anton Blanchard <anton@samba.org>
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Date: Fri, 26 Feb 2016 18:04:16 +1100
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Subject: [PATCH 2/3] ppc64: purgatory: Handle local symbols in ELF ABIv2
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The PowerPC64 ELF ABIv2 has the concept of global and local symbols
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and information on this is encoded in sym->st_other. When doing a
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R_PPC64_REL24 branch we want to hit the local entry point, so adjust
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it as necessary.
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Signed-off-by: Anton Blanchard <anton@samba.org>
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Tested-by: Dave Young <dyoung@redhat.com>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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---
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kexec/arch/ppc64/kexec-elf-rel-ppc64.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/kexec/arch/ppc64/kexec-elf-rel-ppc64.c b/kexec/arch/ppc64/kexec-elf-rel-ppc64.c
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index 8604c4f..43851f6 100644
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--- a/kexec/arch/ppc64/kexec-elf-rel-ppc64.c
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+++ b/kexec/arch/ppc64/kexec-elf-rel-ppc64.c
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@@ -5,6 +5,24 @@
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#include "../../kexec-elf.h"
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#include "kexec-ppc64.h"
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+#if defined(_CALL_ELF) && _CALL_ELF == 2
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+#define STO_PPC64_LOCAL_BIT 5
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+#define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT)
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+#define PPC64_LOCAL_ENTRY_OFFSET(other) \
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+ (((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2)
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+
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+static unsigned int local_entry_offset(struct mem_sym *sym)
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+{
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+ /* If this symbol has a local entry point, use it. */
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+ return PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
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+}
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+#else
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+static unsigned int local_entry_offset(struct mem_sym *UNUSED(sym))
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+{
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+ return 0;
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+}
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+#endif
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+
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int machine_verify_elf_rel(struct mem_ehdr *ehdr)
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{
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if (ehdr->ei_class != ELFCLASS64) {
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@@ -114,6 +132,7 @@ void machine_apply_elf_rel(struct mem_ehdr *ehdr, struct mem_sym *sym,
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break;
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case R_PPC64_REL24:
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+ value += local_entry_offset(sym);
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/* Convert value to relative */
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value -= address;
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if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0) {
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--
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2.5.0
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