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llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_linux_x86_64.S

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[sanitizer][esan] Add internal_sigaction_syscall Summary: Adds a version of sigaction that uses a raw system call, to avoid circular dependencies and support calling sigaction prior to setting up interceptors. The new sigaction relies on an assembly sigreturn routine for its restorer, which is Linux x86_64-only for now. Uses the new sigaction to initialize the working set tool's shadow fault handler prior to libc interceptor being set up. This is required to support instrumentation invoked during interceptor setup, which happens with an instrumented tcmalloc or other allocator compiled with esan. Adds a test that emulates an instrumented allocator. Reviewers: aizatsky Subscribers: vitalybuka, tberghammer, zhaoqin, danalbert, kcc, srhines, eugenis, llvm-commits, kubabrecka Differential Revision: http://reviews.llvm.org/D21083 llvm-svn: 272676
2016-06-14 23:15:38 +08:00
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
// Avoid being marked as needing an executable stack:
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif
// Further contents are x86_64-only:
#if defined(__linux__) && defined(__x86_64__)
#include "../builtins/assembly.h"
// If the "naked" function attribute were supported for x86 we could
// do this via inline asm.
.text
.balign 4
DEFINE_COMPILERRT_FUNCTION(internal_sigreturn)
mov $0xf, %eax // 0xf == SYS_rt_sigreturn
mov %rcx, %r10
syscall
ret // Won't normally reach here.
END_COMPILERRT_FUNCTION(internal_sigreturn)
#endif // defined(__linux__) && defined(__x86_64__)