BMC/Intel-BMC/linux.git/arch/openrisc/kernel/entry.S, branch dev-4.10

openrisc: include l.swa in check for write data pagefault

2016-12-12T14:10:26+00:00

During page fault handling we check the last instruction to understand if the fault was for a read or for a write. By default we fall back to read. New instructions were added to the openrisc 1.1 spec for an atomic load/store pair (l.lwa/l.swa). This patch adds the opcode for l.swa (0x33) allowing it to be treated as a write operation. Signed-off-by: Stefan Kristiansson [shorne@gmail.com: expanded a bit on the comment] Signed-off-by: Stafford Horne

openrisc: restore all regs on rt_sigreturn

2016-12-12T14:09:16+00:00

Fix signal handling for when signals are handled as the result of timers or exceptions, previous code assumed syscalls. This was noticeable with X crashing where it uses SIGALRM. This patch restores all regs before returning to userspace via _resume_userspace instead of via syscall return path. The rt_sigreturn syscall is more like a context switch than a function call; it entails a return from one context (the signal handler) to another (the process in question). For a context switch like this there are effectively no call-saved regs that remain constant across the transition. Reported-by: Sebastian Macke Signed-off-by: Jonas Bonn Tested-by: Guenter Roeck [shorne@gmail.com: Updated comment better reflect change and issue] Signed-off-by: Stafford Horne

openrisc: Rework signal handling

2014-01-09T09:57:21+00:00

The mainline signal handling code for OpenRISC has been buggy since day one with respect to syscall restart. This patch significantly reworks the signal handling code: i) Move the "work pending" loop to C code (borrowed from ARM arch) ii) Allow a tracer to muck about with the IP and skip syscall restart in that case (again, borrowed from ARM) iii) Make signal handling WRT syscall restart actually work v) Make the signal handling code look more like that of other architectures so that it's easier for others to follow Reported-by: Anders Nystrom Signed-off-by: Jonas Bonn

Merge branch 'for-upstream' of git://openrisc.net/jonas/linux

2013-02-27T03:46:23+00:00

Pull OpenRISC updates from Jonas Bonn: "An equal number of bug fixes and trivial cleanups; no new features. - Two patches to fix errors thrown by the updated toolchain. - Three other bug fixes. - Four trivial cleanups." * 'for-upstream' of git://openrisc.net/jonas/linux: openrisc: add missing header inclusion openrisc: really pass correct arg to schedule_tail Add bitops include needed for ext2 filesystem openrisc: update DTLB-miss handler last openrisc: fix up vmalloc page table loading openrisc idle: delete pm_idle openrisc: remove CONFIG_SYMBOL_PREFIX openrisc: avoid using function parameter regs in reset vector openrisc: remove unused current_regs

openrisc: really pass correct arg to schedule_tail

2013-02-17T07:46:21+00:00

Commit 287ad220cd8b5a9d29f71c78f6e4051093f051fc tried to set up the argument to schedule_tail, but ended up using TI_STACK which isn't a defined symbol. Sadly, the old openrisc compiler silently ignores this fact and it was first discovered now when building with an updated toolchain. Reported-by: Christian Svensson Signed-off-by: Jonas Bonn

openrisc: fix up vmalloc page table loading

2013-02-14T15:39:26+00:00

vmalloc'ed pages are faulted into a process' page tables on demand. In order to facilitate this, do_page_fault needs to know whether it was called via a page fault exception or a TLB-miss exception. This patch adds a wrapper around the _x_page_fault_handler entry points that the TLB-miss exceptions can call into in order to have the relevant parameter set to satisfy do_page_fault. This fixes a bug and is "good enough" for now. That said, this whole handling of vmalloc needs to be audited for correctness at some point. Signed-off-by: Jonas Bonn

openrisc: switch to generic sigaltstack

2013-02-03T23:16:05+00:00

Signed-off-by: Al Viro

openrisc: switch to use of generic fork and clone

2012-11-29T04:43:40+00:00

Signed-off-by: Al Viro

openrisc: use generic sys_execve

2012-10-19T16:33:01+00:00

Signed-off-by: Jonas Bonn

openrisc: use generic kernel_thread/kernel_execve

2012-10-19T16:32:36+00:00

Signed-off-by: Jonas Bonn