Re: [PATCH v26 26/30] ELF: Introduce arch_setup_elf_property()

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On 5/20/2021 10:52 AM, Yu, Yu-cheng wrote:
On 5/20/2021 10:38 AM, Matthew Wilcox wrote:
On Wed, May 19, 2021 at 03:14:58PM -0700, Yu, Yu-cheng wrote:
+++ b/include/uapi/linux/elf.h
@@ -455,4 +455,13 @@ typedef struct elf64_note {
   /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
   #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI    (1U << 0)
+/* .note.gnu.property types for x86: */
+#define GNU_PROPERTY_X86_FEATURE_1_AND        0xc0000002

Why not 0xc0000001? ARM64 is 0xc0000000...


I just looked at the ABI document.

ARM has GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000

X86 has:
    GNU_PROPERTY_X86_ISA_1_USED    0xc0000000
    GNU_PROPERTY_X86_ISA_1_NEEDED    0xc0000001
    GNU_PROPERTY_X86_FEATURE_1_AND    0xc0000002

Please add all three, not just the last one.


Ok!

Just found out, I have been reading an older version. Now 0xc0000000 and 0xc0000001 have become reserved/not-used. Maybe I will just put a note about that along with the link to the ABI document.

Yu-cheng



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