From 17ebb6ffaed73bd144639775a10a09e651f1c6e3 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Sun, 26 Dec 2021 11:45:19 +0100 Subject: [PATCH] package/glibc: add a patch to fix build issue in kernels >= 3.15 and < 5.1 on Microblaze As explained in the patch itself, there is a bug in the handling of __pselect32() in glibc for the Microblaze architecture. There a special Microblaze variant that was added to support kernels older than < 3.15, but it "hides" a generic implementation that is needed to support kernels newer than 3.15 but older than 5.1 (which is when the time64 support for 32-bit architectures was added, making __pselect32 no longer needed). This bug causes a glibc build failure for kernels >= 3.15 but < 5.1, on Microblaze. Signed-off-by: Thomas Petazzoni Signed-off-by: Yann E. MORIN --- ...v-linux-microblaze-pselect32.c-add-m.patch | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 package/glibc/2.34-9-g9acab0bba6a5a57323b1f94bf95b21618a9e5aa4/0001-sysdeps-unix-sysv-linux-microblaze-pselect32.c-add-m.patch diff --git a/package/glibc/2.34-9-g9acab0bba6a5a57323b1f94bf95b21618a9e5aa4/0001-sysdeps-unix-sysv-linux-microblaze-pselect32.c-add-m.patch b/package/glibc/2.34-9-g9acab0bba6a5a57323b1f94bf95b21618a9e5aa4/0001-sysdeps-unix-sysv-linux-microblaze-pselect32.c-add-m.patch new file mode 100644 index 0000000000..3597cd6a11 --- /dev/null +++ b/package/glibc/2.34-9-g9acab0bba6a5a57323b1f94bf95b21618a9e5aa4/0001-sysdeps-unix-sysv-linux-microblaze-pselect32.c-add-m.patch @@ -0,0 +1,85 @@ +From af06fe63f9babb6d0179ae5d7d9245daada6bf56 Mon Sep 17 00:00:00 2001 +From: Thomas Petazzoni +Date: Sun, 26 Dec 2021 10:30:01 +0100 +Subject: [PATCH] sysdeps/unix/sysv/linux/microblaze/pselect32.c: add missing + implementation when !__ASSUME_TIME64_SYSCALLS + +In commit a92f4e6299fe0e3cb6f77e79de00817aece501ce ("linux: Add time64 +pselect support"), a Microblaze specific implementation of +__pselect32() was added to cover the case of kernels < 3.15 which lack +the pselect6 system call. + +This new file sysdeps/unix/sysv/linux/microblaze/pselect32.c takes +precedence over the default implementation +sysdeps/unix/sysv/linux/pselect32.c. + +However sysdeps/unix/sysv/linux/pselect32.c provides an implementation +of __pselect32() which is needed when __ASSUME_TIME64_SYSCALLS is not +defined. On Microblaze, which is a 32-bit architecture, +__ASSUME_TIME64_SYSCALLS is only true for kernels >= 5.1. + +Due to sysdeps/unix/sysv/linux/microblaze/pselect32.c taking +precedence over sysdeps/unix/sysv/linux/pselect32.c, it means that +when we are with a kernel >= 3.15 but < 5.1, we need a __pselect32() +implementation, but sysdeps/unix/sysv/linux/microblaze/pselect32.c +doesn't provide it, and sysdeps/unix/sysv/linux/pselect32.c which +would provide it is not compiled in. + +This causes the following build failure on Microblaze with for example +Linux kernel headers 4.9: + +/home/thomas/buildroot/buildroot/output/host/lib/gcc/microblazeel-buildroot-linux-gnu/10.3.0/../../../../microblazeel-buildroot-linux-gnu/bin/ld: /home/thomas/buildroot/buildroot/output/build/glibc-2.34-9-g9acab0bba6a5a57323b1f94bf95b21618a9e5aa4/build/libc_pic.os: in function `__pselect64': +(.text+0x120b44): undefined reference to `__pselect32' +collect2: error: ld returned 1 exit status + +To fix this, we take a crude approach: replicate in +sysdeps/unix/sysv/linux/microblaze/pselect32.c the +!__ASSUME_TIME64_SYSCALLS implementation that is already in +sysdeps/unix/sysv/linux/pselect32.c. + +Upstream: https://sourceware.org/pipermail/libc-alpha/2021-December/134635.html +Signed-off-by: Thomas Petazzoni +--- + .../unix/sysv/linux/microblaze/pselect32.c | 22 +++++++++++++++++-- + 1 file changed, 20 insertions(+), 2 deletions(-) + +diff --git a/sysdeps/unix/sysv/linux/microblaze/pselect32.c b/sysdeps/unix/sysv/linux/microblaze/pselect32.c +index 70b7b52a48..6b6b3e8a2e 100644 +--- a/sysdeps/unix/sysv/linux/microblaze/pselect32.c ++++ b/sysdeps/unix/sysv/linux/microblaze/pselect32.c +@@ -22,7 +22,25 @@ + #include + #include + +-#ifndef __ASSUME_PSELECT ++#if !defined(__ASSUME_TIME64_SYSCALLS) ++int ++__pselect32 (int nfds, fd_set *readfds, fd_set *writefds, ++ fd_set *exceptfds, const struct __timespec64 *timeout, ++ const sigset_t *sigmask) ++{ ++ struct timespec ts32, *pts32 = NULL; ++ if (timeout != NULL) ++ { ++ ts32 = valid_timespec64_to_timespec (*timeout); ++ pts32 = &ts32; ++ } ++ ++ return SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, ++ pts32, ++ ((__syscall_ulong_t[]){ (uintptr_t) sigmask, ++ __NSIG_BYTES })); ++} ++#elif !defined(__ASSUME_PSELECT) + int + __pselect32 (int nfds, fd_set *readfds, fd_set *writefds, + fd_set *exceptfds, const struct __timespec64 *timeout, +@@ -57,4 +75,4 @@ __pselect32 (int nfds, fd_set *readfds, fd_set *writefds, + + return ret; + } +-#endif /* __ASSUME_PSELECT */ ++#endif +-- +2.31.1 +