diff options
| author | Brooks Davis <brooks@FreeBSD.org> | 2024-07-23 21:31:44 +0000 |
|---|---|---|
| committer | Brooks Davis <brooks@FreeBSD.org> | 2024-07-23 21:31:44 +0000 |
| commit | cade8f6c118f304eb7c91a1d423b4a97ee466284 (patch) | |
| tree | f9e807f7a5b90a2ada99300afe66c44149f3112b | |
| parent | 0ac6cc3fd7473a7a8596fa73322a67fc1d78df53 (diff) | |
ELF auxargs: reserve a slot for CheriABI use
Reserve slot 37 to avoid flag days downstream.
We currently use this slot in CheriBSD to maintain counters in userspace
while providing access to them vis sysctl. CHERI support isn't landing
in FreeBSD quite yet (probably for 16 unless hardware access accelerates
radically), but it seems highly likely at this point so reserving slots
will limit future diffs in both directions.
Reviewed by: jhb
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D46060
| -rw-r--r-- | sys/sys/elf_common.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h index b9e82cb8fa35..6cb92d1011fe 100644 --- a/sys/sys/elf_common.h +++ b/sys/sys/elf_common.h @@ -990,8 +990,9 @@ typedef struct { #define AT_KPRELOAD 34 /* Base of vdso, preloaded by rtld */ #define AT_USRSTACKBASE 35 /* Top of user stack */ #define AT_USRSTACKLIM 36 /* Grow limit of user stack */ +#define AT_CHERI_STATS 37 /* Reserved */ -#define AT_COUNT 37 /* Count of defined aux entry types. */ +#define AT_COUNT 38 /* Count of defined aux entry types. */ /* * Relocation types. |