kernel.git/arch/xtensa/kernel/signal.c, branch linux-5.13.y

xtensa: add support for TIF_NOTIFY_SIGNAL

2020-11-12T15:45:56Z

Wire up TIF_NOTIFY_SIGNAL handling for xtensa. Thanks to Max Filippov for making the asm correct. Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Jens Axboe

tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()

2020-10-17T21:04:36Z

All the callers currently do this, clean it up and move the clearing into tracehook_notify_resume() instead. Reviewed-by: Oleg Nesterov Reviewed-by: Thomas Gleixner Signed-off-by: Jens Axboe

treewide: Use fallthrough pseudo-keyword

2020-08-23T22:36:59Z

Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva

xtensa: clean up system_call/xtensa_rt_sigreturn interaction

2019-11-30T03:37:12Z

system_call assembly code always pushes pointer to struct pt_regs as the last additional parameter for all system calls. The only user of this feature is xtensa_rt_sigreturn. Avoid this special case. Define xtensa_rt_sigreturn as accepting no argiments. Use current_pt_regs to get pointer to struct pt_regs in xtensa_rt_sigreturn. Don't pass additional parameter from system_call code. Signed-off-by: Max Filippov

xtensa: add support for call0 ABI in userspace

2019-09-01T20:11:57Z

Provide a Kconfig choice to select whether only the default ABI, only call0 ABI or both are supported. The default for XEA2 is windowed, but it may change for XEA3. Call0 only runs userspace with PS.WOE disabled. Supporting both windowed and call0 ABIs is tricky, as there's no indication in the ELF binaries which ABI they use. So it is done by probing: each process is started with PS.WOE disabled, but the handler of an illegal instruction exception taken with PS.WOE retries faulting instruction after enabling PS.WOE. It must happen before any signal is delivered to the process, otherwise it may be delivered incorrectly. Signed-off-by: Max Filippov

signal: Remove task parameter from force_sig

2019-05-27T14:36:28Z

All of the remaining callers pass current into force_sig so remove the task parameter to make this obvious and to make misuse more difficult in the future. This also makes it clear force_sig passes current into force_sig_info. Signed-off-by: "Eric W. Biederman"

Remove 'type' argument from access_ok() function

2019-01-04T02:57:57Z

Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds

xtensa: use NO_SYSCALL instead of -1

2018-12-17T21:48:21Z

For the sake of clarity define macro NO_SYSCALL and use it for setting/checking struct pt_regs::syscall field. Signed-off-by: Max Filippov

xtensa: clean up custom-controlled debug output

2017-12-17T06:37:08Z

Replace #ifdef'fed/commented out debug printk statements with pr_debug. Replace printk statements with pr_* equivalents. Signed-off-by: Max Filippov

xtensa: clean up access to spilled registers locations

2017-05-01T17:34:43Z

Define macros SPILL_SLOT* that return a reference to the stack location of the spill slot for specific register and use them instead of opencoded address calculations. Signed-off-by: Max Filippov