[PATCH v6 2/4] powerpc/64: Add module check for ELF ABI version

[Nicholas Piggin]

Override the generic module ELF check to provide a check for the ELF ABI
version. This becomes important if we allow big-endian ELF ABI V2 builds
but it doesn't hurt to check now.

Cc: Jessica Yu <jeyu at kernel.org>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
[np: split patch, added changelog, adjust to Jessica's proposal]
Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 arch/powerpc/kernel/module_64.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 7e45dc98df8a..ff045644f13f 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -31,6 +31,16 @@
    this, and makes other things simpler.  Anton?
    --RR.  */
 
+bool module_elf_check_arch(Elf_Ehdr *hdr)
+{
+	unsigned long abi_level = hdr->e_flags & 0x3;
+
+	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2))
+		return abi_level == 2;
+	else
+		return abi_level < 2;
+}
+
 #ifdef CONFIG_PPC64_ELF_ABI_V2
 
 static func_desc_t func_desc(unsigned long addr)
-- 
2.37.2