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| author | Palmer Dabbelt <palmer@rivosinc.com> | 2022-03-22 15:48:59 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-03-22 16:20:37 -0700 |
| commit | bbde015227e89f1da21bd3b84523d62c4a445c06 (patch) | |
| tree | 92f1ed47d77055a7ac9b75edac36a2798677610b /arch/riscv | |
| parent | 6ae1af9ca0e81f7123d36eae9bf25de63722fbf6 (diff) | |
| parent | 6d1a6f464efd596779d1b272b3dc8170c5fa189f (diff) | |
RISC-V: add support for restartable sequences
Add support for RSEQ, restartable sequences, for RISC-V. This also adds
support for the related selftests.
Note: the selftests require a linker with 3e7bd7f2414 ("RISC-V: Fix
linker problems with tls copy relocs."), which was first released in
2.33 (from 2019).
* palmer/riscv-rseq:
rseq/selftests: Add support for RISC-V
RISC-V: Add support for restartable sequence
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/Kconfig | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/entry.S | 4 | ||||
| -rw-r--r-- | arch/riscv/kernel/signal.c | 2 |
3 files changed, 7 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 339ba6f6580d..f58ad31b9767 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -101,6 +101,7 @@ config RISCV select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS + select HAVE_RSEQ select IRQ_DOMAIN select IRQ_FORCED_THREADING select MODULES_USE_ELF_RELA if MODULES diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index ed29e9c8f660..56ada2a583fa 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -225,6 +225,10 @@ ret_from_syscall: * (If it was configured with SECCOMP_RET_ERRNO/TRACE) */ ret_from_syscall_rejected: +#ifdef CONFIG_DEBUG_RSEQ + move a0, sp + call rseq_syscall +#endif /* Trace syscalls, but only if requested by the user. */ REG_L t0, TASK_TI_FLAGS(tp) andi t0, t0, _TIF_SYSCALL_WORK diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c index c2d5ecbe5526..16da3c3b53a1 100644 --- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -258,6 +258,8 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) } } + rseq_signal_deliver(ksig, regs); + /* Set up the stack frame */ ret = setup_rt_frame(ksig, oldset, regs); |