MIRRORS/linux-yocto
1
0
Fork 0
mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-10-23 07:23:12 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

openrisc: Add support for restartable sequences

Browse Source 
Implement support for restartable sequences on OpenRISC by doing:
 - Select HAVE_RSEQ in Kconfig
 - Call rseq_syscall() on return to userspace when CONFIG_DEBUG_RSEQ
   is enabled.
 - Call rseq_signal_deliver() to fixup the pre-signal stack frame when a
   signal is delivered on top of a restartable sequence critical section

Cc: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2024-12-12 12:33:56 +00:00
parent 7ce8716e27
commit ca46ebffc2
3 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/openrisc/Kconfig
View File

@ -28,6 +28,7 @@ config OPENRISC
select HAVE_UID16 select HAVE_UID16
select HAVE_PAGE_SIZE_8KB select HAVE_PAGE_SIZE_8KB
select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RSEQ
select GENERIC_ATOMIC64 select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_SMP_IDLE_THREAD select GENERIC_SMP_IDLE_THREAD

4
arch/openrisc/kernel/entry.S
View File

@ -714,6 +714,10 @@ _syscall_check_trace_leave:
* interrupts that set NEED_RESCHED or SIGNALPENDING... really true? */ * interrupts that set NEED_RESCHED or SIGNALPENDING... really true? */
_syscall_check_work: _syscall_check_work:
#ifdef CONFIG_DEBUG_RSEQ
l.jal rseq_syscall
l.ori r3,r1,0
#endif
/* Here we need to disable interrupts */ /* Here we need to disable interrupts */
DISABLE_INTERRUPTS(r27,r29) DISABLE_INTERRUPTS(r27,r29)
TRACE_IRQS_OFF TRACE_IRQS_OFF

2
arch/openrisc/kernel/signal.c
View File

@ -244,6 +244,8 @@ handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{ {
int ret; int ret;
rseq_signal_deliver(ksig, regs);
ret = setup_rt_frame(ksig, sigmask_to_save(), regs); ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP)); signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));