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| author | Evan Green <evan@rivosinc.com> | 2024-02-27 14:56:40 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-03-01 07:14:58 -0800 |
| commit | 78308ce77ad55191d2e578bbcd19bb55c68926cb (patch) | |
| tree | b3d1d142e10539967b6cc545e4f3c76763a76015 /sysdeps/unix | |
| parent | e7919e0db28837ae5e4315933a061a7c2eda442e (diff) | |
| download | glibc-78308ce77ad55191d2e578bbcd19bb55c68926cb.zip glibc-78308ce77ad55191d2e578bbcd19bb55c68926cb.tar.gz glibc-78308ce77ad55191d2e578bbcd19bb55c68926cb.tar.bz2 | |
riscv: Add __riscv_hwprobe pointer to ifunc calls
The new __riscv_hwprobe() function is designed to be used by ifunc
selector functions. This presents a challenge for applications and
libraries, as ifunc selectors are invoked before all relocations have
been performed, so an external call to __riscv_hwprobe() from an ifunc
selector won't work. To address this, pass a pointer to the
__riscv_hwprobe() function into ifunc selectors as the second
argument (alongside dl_hwcap, which was already being passed).
Include a typedef as well for convenience, so that ifunc users don't
have to go through contortions to call this routine. Users will need to
remember to check the second argument for NULL, to account for older
glibcs that don't pass the function.
Signed-off-by: Evan Green <evan@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h b/sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h index 5592b9e..34a2e3d 100644 --- a/sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h +++ b/sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h @@ -69,6 +69,16 @@ extern int __riscv_hwprobe (struct riscv_hwprobe *__pairs, size_t __pair_count, __fortified_attr_access (__read_write__, 1, 2) __fortified_attr_access (__read_only__, 4, 3); +/* A pointer to the __riscv_hwprobe vDSO function is passed as the second + argument to ifunc selector routines. Include a function pointer type for + convenience in calling the function in those settings. */ +typedef int (*__riscv_hwprobe_t) (struct riscv_hwprobe *__pairs, size_t __pair_count, + size_t __cpu_count, unsigned long int *__cpus, + unsigned int __flags) + __nonnull ((1)) __wur + __fortified_attr_access (__read_write__, 1, 2) + __fortified_attr_access (__read_only__, 4, 3); + __END_DECLS #endif /* sys/hwprobe.h */ |