5a1392221308acd0cd74a43f2c985bd316adaa77 |
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28-Feb-2014 |
Elliott Hughes <enh@google.com> |
Fix stack_t decoding and sigset_t decoding. Corresponds to the following upstream patches: commit d153bfc505dd30dabc2509091e67460c3ca1675b Author: Dmitry V. Levin <ldv@altlinux.org> Date: Wed Feb 26 22:29:27 2014 +0000 Add multi-personality support to stack_t decoding stack_t is one of many structures that contain members whose size differs between 32-bit and 64-bit personalities. * signal.c (print_stack_t): Decode 32-bit stack_t on a 64-bit host. Reported-by: Elliott Hughes <enh@google.com> commit 38593e942ad4b16b2c3c43ea521167368771cbfb Author: Dmitry V. Levin <ldv@altlinux.org> Date: Wed Feb 26 16:51:28 2014 +0000 Rewrite signal mask decoding without sigset_t The sigset_t provided by libc is not quite convenient. In glibc, sigset_t is an array with space for 1024 bits, which is much more than required: all architectures supported by Linux have only 64 signals except MIPS, which has 128. In bionic libc, LP32 sigset_t is only 4 bytes long, which is less than necessary. With this change, signal mask is decoded without use of intermediate sigset_t structure, which saves us some cpu cycles in case of glibc with its inflated sigset_t, and enables build with libcs where sigset_t is broken. Old implementation used to check each signal number in the given signal mask twice using sigismember(). New implementation is based on popcount and next_set_bit() so it's noticeably faster. * configure.ac: Check for __builtin_popcount. * signal.c: Ensure that NSIG >= 32. (sprintsigmask, sprintsigmask_long, printsigmask): Remove. (popcount32, sprintsigmask_n): New functions. (tprintsigmask_addr, sprintsigmask_val, tprintsigmask_val): New macros. (print_sigset_addr_len, sys_sigsetmask, sys_sigreturn, sys_siggetmask, sys_sigsuspend, sys_sigprocmask, decode_new_sigaction): Update to use new signal mask decoding interface. * tests/sigaction.c (main): Add a test with almost filled signal mask. * tests/sigaction.awk: Update. Change-Id: I4598a97290b3d8415b4946a3e5121248cd97e7b9
/external/strace/tests/sigaction.awk
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