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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-12-13 17:30:15 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-01-03 10:02:05 -0300 |
| commit | d0def09ff6bbf1537beec305fdfe96a21174fb31 (patch) | |
| tree | a5fa523331ba965b0f6a876ea69f463c6c5a2e9f /sysdeps/unix/sysv/linux/sysdep-vdso.h | |
| parent | b03688bfbb072f42970747bc2e6362c24b4b7ee8 (diff) | |
| download | glibc-d0def09ff6bbf1537beec305fdfe96a21174fb31.tar.gz glibc-d0def09ff6bbf1537beec305fdfe96a21174fb31.tar.xz glibc-d0def09ff6bbf1537beec305fdfe96a21174fb31.zip | |
linux: Fix vDSO macros build with time64 interfaces
As indicated on libc-help [1] the ec138c67cb commit broke 32-bit builds when configured with --enable-kernel=5.1 or higher. The scenario 10 from [2] might also occur in this configuration and INLINE_VSYSCALL will try to use the vDSO symbol and HAVE_CLOCK_GETTIME64_VSYSCALL does not set HAVE_VSYSCALL prior its usage. Also, there is no easy way to just enable the code to use one vDSO symbol since the macro INLINE_VSYSCALL is redefined if HAVE_VSYSCALL is set. Instead of adding more pre-processor handling and making the code even more convoluted, this patch removes the requirement of defining HAVE_VSYSCALL before including sysdep-vdso.h to enable vDSO usage. The INLINE_VSYSCALL is now expected to be issued inside a HAVE_*_VSYSCALL check, since it will try to use the internal vDSO pointers. Both clock_getres and clock_gettime vDSO code for time64_t were removed since there is no vDSO setup code for the symbol (an architecture can not set HAVE_CLOCK_GETTIME64_VSYSCALL). Checked on i686-linux-gnu (default and with --enable-kernel=5.1), x86_64-linux-gnu, aarch64-linux-gnu, and powerpc64le-linux-gnu. I also checked against a build to mips64-linux-gnu and sparc64-linux-gnu. [1] https://sourceware.org/ml/libc-help/2019-12/msg00014.html [2] https://sourceware.org/ml/libc-alpha/2019-12/msg00142.html Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/sysdep-vdso.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysdep-vdso.h | 34 |
1 files changed, 2 insertions, 32 deletions
diff --git a/sysdeps/unix/sysv/linux/sysdep-vdso.h b/sysdeps/unix/sysv/linux/sysdep-vdso.h index 3af56cd3b4..f0cc384d78 100644 --- a/sysdeps/unix/sysv/linux/sysdep-vdso.h +++ b/sysdeps/unix/sysv/linux/sysdep-vdso.h @@ -20,17 +20,14 @@ # define SYSDEP_VDSO_LINUX_H #include <dl-vdso.h> +#include <libc-vdso.h> #ifndef INTERNAL_VSYSCALL_CALL # define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \ funcptr (args) #endif -#ifdef HAVE_VSYSCALL - -# include <libc-vdso.h> - -# define INLINE_VSYSCALL(name, nr, args...) \ +#define INLINE_VSYSCALL(name, nr, args...) \ ({ \ __label__ out; \ __label__ iserr; \ @@ -59,31 +56,4 @@ sc_ret; \ }) -# define INTERNAL_VSYSCALL(name, err, nr, args...) \ - ({ \ - __label__ out; \ - long v_ret; \ - \ - __typeof (__vdso_##name) vdsop = __vdso_##name; \ - PTR_DEMANGLE (vdsop); \ - if (vdsop != NULL) \ - { \ - v_ret = INTERNAL_VSYSCALL_CALL (vdsop, err, nr, ##args); \ - if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \ - || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \ - goto out; \ - } \ - v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \ - out: \ - v_ret; \ - }) -#else - -# define INLINE_VSYSCALL(name, nr, args...) \ - INLINE_SYSCALL (name, nr, ##args) -# define INTERNAL_VSYSCALL(name, err, nr, args...) \ - INTERNAL_SYSCALL (name, err, nr, ##args) - -#endif /* USE_VSYSCALL && defined HAVE_VSYSCALL */ - #endif /* SYSDEP_VDSO_LINUX_H */ |