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| author | Manjunath Matti <mmatti@linux.ibm.com> | 2024-03-19 15:29:48 -0500 |
|---|---|---|
| committer | Peter Bergner <bergner@linux.ibm.com> | 2024-03-19 17:19:27 -0500 |
| commit | 3ab9b88e2ac91062b6d493fe32bd101a55006c6a (patch) | |
| tree | a13cf4a7a73bb6f77748d2bfefedce381591be56 /elf | |
| parent | 3d53d18fc71c5d9ef4773b8bce04d54b80181926 (diff) | |
| download | glibc-3ab9b88e2ac91062b6d493fe32bd101a55006c6a.zip glibc-3ab9b88e2ac91062b6d493fe32bd101a55006c6a.tar.gz glibc-3ab9b88e2ac91062b6d493fe32bd101a55006c6a.tar.bz2 | |
powerpc: Add HWCAP3/HWCAP4 data to TCB for Power Architecture.
This patch adds a new feature for powerpc. In order to get faster
access to the HWCAP3/HWCAP4 masks, similar to HWCAP/HWCAP2 (i.e. for
implementing __builtin_cpu_supports() in GCC) without the overhead of
reading them from the auxiliary vector, we now reserve space for them
in the TCB.
This is an ABI change for GLIBC 2.39.
Suggested-by: Peter Bergner <bergner@linux.ibm.com>
Reviewed-by: Peter Bergner <bergner@linux.ibm.com>
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/dl-diagnostics.c | 2 | ||||
| -rw-r--r-- | elf/dl-support.c | 2 | ||||
| -rw-r--r-- | elf/elf.h | 4 |
3 files changed, 8 insertions, 0 deletions
diff --git a/elf/dl-diagnostics.c b/elf/dl-diagnostics.c index 7345ebc..aaf67b8 100644 --- a/elf/dl-diagnostics.c +++ b/elf/dl-diagnostics.c @@ -235,6 +235,8 @@ _dl_print_diagnostics (char **environ) _dl_diagnostics_print_labeled_value ("dl_hwcap", GLRO (dl_hwcap)); _dl_diagnostics_print_labeled_value ("dl_hwcap_important", HWCAP_IMPORTANT); _dl_diagnostics_print_labeled_value ("dl_hwcap2", GLRO (dl_hwcap2)); + _dl_diagnostics_print_labeled_value ("dl_hwcap3", GLRO (dl_hwcap3)); + _dl_diagnostics_print_labeled_value ("dl_hwcap4", GLRO (dl_hwcap4)); _dl_diagnostics_print_labeled_string ("dl_hwcaps_subdirs", _dl_hwcaps_subdirs); _dl_diagnostics_print_labeled_value diff --git a/elf/dl-support.c b/elf/dl-support.c index 2f502c8..451932d 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -158,6 +158,8 @@ const ElfW(Phdr) *_dl_phdr; size_t _dl_phnum; uint64_t _dl_hwcap; uint64_t _dl_hwcap2; +uint64_t _dl_hwcap3; +uint64_t _dl_hwcap4; enum dso_sort_algorithm _dl_dso_sort_algo; @@ -1234,6 +1234,10 @@ typedef struct #define AT_RSEQ_FEATURE_SIZE 27 /* rseq supported feature size. */ #define AT_RSEQ_ALIGN 28 /* rseq allocation alignment. */ +/* More machine-dependent hints about processor capabilities. */ +#define AT_HWCAP3 29 /* extension of AT_HWCAP. */ +#define AT_HWCAP4 30 /* extension of AT_HWCAP. */ + #define AT_EXECFN 31 /* Filename of executable. */ /* Pointer to the global system page used for system calls and other |