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glibc/sysdeps/unix/sysv/linux/powerpc/kernel_sigaction.h

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linux: Consolidate sigaction implementation This patch consolidates all Linux sigaction implementations on the default sysdeps/unix/sysv/linux/sigaction.c. The idea is remove redundant code and simplify new ports addition by following the current generic Linux User API (UAPI). The UAPI for new ports defines a generic extensible sigaction struct as: struct sigaction { __sighandler_t sa_handler; unsigned long sa_flags; #ifdef SA_RESTORER void (*sa_restorer) (void); #endif sigset_t sa_mask; }; Where SA_RESTORER is just placed for compatibility reasons (news ports should not add it). A similar definition is used on generic kernel_sigaction.h. The user exported sigaction definition is not changed, so for most architectures it requires an adjustment to kernel expected one for the syscall. The main changes are: - All architectures now define and use a kernel_sigaction struct meant for the syscall, even for the architectures where the user sigaction has the same layout of the kernel expected one (s390-64 and ia64). Although it requires more work for these architectures, it simplifies the generic implementation. Also, sigaction is hardly a hotspot where micro optimization would play an important role. - The generic kernel_sigaction definition is now aligned with expected UAPI one for newer ports, where SA_RESTORER and sa_restorer are not expected to be defined. This means adding kernel_sigaction for current architectures that does define it (m68k, nios2, powerpc, s390, sh, sparc, and tile) and which rely on previous generic definition. - Remove old MIPS usage of sa_restorer. This was removed since 2.6.27 (2957c9e61ee9c - "[MIPS] IRIX: Goodbye and thanks for all the fish"). - The remaining arch-specific sigaction.c are to handle ABI idiosyncrasies (like SPARC kernel ABI for rt_sigaction that requires an additional stub argument). So for new ports the generic implementation should work if its uses Linux UAPI. If SA_RESTORER is still required (due some architecture limitation), it should define its own kernel_sigaction.h, define it and include generic header (assuming it still uses the default generic kernel layout). Checked on x86_64-linux-gnu, i686-linux-gnu, arm-linux-gnueabihf, aarch64-linux-gnu, sparc64-linux-gnu, sparcv9-linux-gnu, powerpc-linux-gnu, powerpc64-linux-gnu, ia64-linux-gnu and alpha-linux-gnu. I also checked the build on all remaining affected ABIs. * sysdeps/unix/sysv/linux/aarch64/sigaction.c: Use default Linux version as base implementation. * sysdeps/unix/sysv/linux/arm/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/i386/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/x86_64/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/alpha/kernel_sigaction.h: Add include guards, remove unrequired definitions and update comments. * sysdeps/unix/sysv/linux/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/mips/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/ia64/kernel_sigaction.h: New file. * sysdeps/unix/sysv/linux/m68k/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/nios2/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/kernel_sigaction: Likewise. * sysdeps/unix/sysv/linux/s390/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/sh/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/sparc/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/tile/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/ia64/sigaction.c: Remove file. * sysdeps/unix/sysv/linux/mips/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/sigaction.c: Add STUB, SET_SA_RESTORER, and RESET_SA_RESTORER hooks.
2017-11-02 13:04:18 +00:00
/* powerpc kernel sigaction is similar to generic Linux UAPI one,
but the architecture also defines SA_RESTORER. */
#define SA_RESTORER 0x04000000
#define SET_SA_RESTORER(kact, act) \
(kact)->sa_restorer = (act)->sa_restorer
#define RESET_SA_RESTORER(act, kact) \
(act)->sa_restorer = (kact)->sa_restorer
m68k: Fix sigaction kernel definition (BZ #23960) Commit b4a5d26d883 (linux: Consolidate sigaction implementation) added a wrong kernel_sigaction definition for m68k, meant for __NR_sigaction instead of __NR_rt_sigaction as used on generic Linux sigaction implementation. This patch fixes it by using the Linux generic definition meant for the RT kernel ABI. Checked the signal tests on emulated m68-linux-gnu (Aranym). It fixes the faulty signal/tst-sigaction and man works as expected. Adhemerval Zanella <adhemerval.zanella@linaro.org> James Clarke <jrtc27@jrtc27.com> [BZ #23960] * sysdeps/unix/sysv/linux/kernel_sigaction.h (HAS_SA_RESTORER): Define if SA_RESTORER is defined. (kernel_sigaction): Define sa_restorer if HAS_SA_RESTORER is defined. (SET_SA_RESTORER, RESET_SA_RESTORER): Define iff the macro are not already defined. * sysdeps/unix/sysv/linux/m68k/kernel_sigaction.h (SA_RESTORER, kernel_sigaction, SET_SA_RESTORER, RESET_SA_RESTORER): Remove definitions. (HAS_SA_RESTORER): Define. * sysdeps/unix/sysv/linux/sparc/kernel_sigaction.h (SA_RESTORER, SET_SA_RESTORER, RESET_SA_RESTORER): Remove definition. (HAS_SA_RESTORER): Define. * sysdeps/unix/sysv/linux/nios2/kernel_sigaction.h: Include generic kernel_sigaction after define SET_SA_RESTORER and RESET_SA_RESTORER. * sysdeps/unix/sysv/linux/powerpc/kernel_sigaction.h: Likewise. * sysdeps/unix/sysv/linux/x86_64/sigaction.c: Likewise.
2018-12-11 18:52:47 +00:00
#include <sysdeps/unix/sysv/linux/kernel_sigaction.h>
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