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From: Vincent Chen <vincent.chen@sifive.com>
To: paul.walmsley@sifive.com, mathieu.desnoyers@efficios.com
Cc: linux-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org,
	vincent.chen@sifive.com
Subject: [PATCH 0/3] riscv: add support for restartable sequence 
Date: Tue,  5 Nov 2019 09:58:31 +0800
Message-ID: <1572919114-3886-1-git-send-email-vincent.chen@sifive.com> (raw)

Add RSEQ, restartable sequence, support and related selftest to RISCV.
The Kconfig option HAVE_REGS_AND_STACK_ACCESS_API is also required by
RSEQ because RSEQ will modify the content of pt_regs.sepc through
instruction_pointer_set() during the fixup procedure. In order to select
the config HAVE_REGS_AND_STACK_ACCESS_API, the missing APIs for accessing
pt_regs are also added in this patch set.
  
The relevant RSEQ tests in kselftest require the Binutils patch "RISC-V:
Fix linker problems with TLS copy relocs" to avoid placing
PREINIT_ARRAY and TLS variable of librseq.so at the same address.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=3e7bd7f24146f162565edf878840449f36a8d974
A segmental fault will happen if the Binutils misses this patch.



Vincent Chen (3):
  riscv: add required functions to enable HAVE_REGS_AND_STACK_ACCESS_API
  riscv: Add support for restartable sequence
  rseq/selftests: Add support for riscv

 arch/riscv/Kconfig                        |   2 +
 arch/riscv/include/asm/ptrace.h           |  29 +-
 arch/riscv/kernel/entry.S                 |   4 +
 arch/riscv/kernel/ptrace.c                |  99 +++++
 arch/riscv/kernel/signal.c                |   3 +
 tools/testing/selftests/rseq/param_test.c |  23 ++
 tools/testing/selftests/rseq/rseq-riscv.h | 622 ++++++++++++++++++++++++++++++
 tools/testing/selftests/rseq/rseq.h       |   2 +
 8 files changed, 783 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/rseq/rseq-riscv.h

-- 
2.7.4


             reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05  1:58 Vincent Chen [this message]
2019-11-05  1:58 ` [PATCH 1/3] riscv: add required functions to enable HAVE_REGS_AND_STACK_ACCESS_API Vincent Chen
2019-11-21 20:29   ` Paul Walmsley
2019-11-21 22:32     ` Paul Walmsley
2019-11-26 12:48       ` Vincent Chen
2019-11-05  1:58 ` [PATCH 2/3] riscv: Add support for restartable sequence Vincent Chen
2019-11-05  1:58 ` [PATCH 3/3] rseq/selftests: Add support for riscv Vincent Chen
2020-01-13 18:47 ` [PATCH 0/3] riscv: add support for restartable sequence Palmer Dabbelt

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