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2023-08-18ARC: pt_regs: create seperate type for ecrVineet Gupta1-2/+2
Reduces duplication in each ISA specific pt_regs Tested-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected] Signed-off-by: Vineet Gupta <[email protected]>
2023-08-17ARC: entry: rework (non-functional)Vineet Gupta1-1/+1
- comments update - rename syscall_trace_entry - use PT_xxx in entry code Signed-off-by: Vineet Gupta <[email protected]>
2023-08-17ARC: entry: use gp to cache task pointer (vs. r25)Vineet Gupta1-2/+0
The motivation is eventual ABI considerations for ARCv3 but even without it this change us worthwhile as diffstat reduces 100 net lines r25 is a callee saved register, normally not saved by entry code in pt_regs. However because of its usage in CONFIG_ARC_CURR_IN_REG it needs to be. This in turn requires a whole bunch of special casing when we need to access r25. Then there is distinction between user mode r25 vs. kernel mode r25 - hence distinct SAVE_CALLEE_SAVED_{USER,KERNEL} Instead use gp which is a scratch register and thus saved already in entry code. This cleans things up significantly and much nocer on eyes: - SAVE_CALLEE_SAVED_{USER,KERNEL} are now exactly same - no special user_r25 slot in pt_reggs Note that typical global asm registers are callee-saved (r25), but gp is not callee-saved thus needs additional -ffixed-<reg> toggle Signed-off-by: Vineet Gupta <[email protected]>
2022-11-15arc: ptrace: user_regset_copyin_ignore() always returns 0Sergey Shtylyov1-1/+1
Patch series "Make user_regset_copyin_ignore() *void*". user_regset_copyin_ignore() apparently cannot fail and so always returns 0. Let's first remove the result checks in several architectures that call this function and then make user_regset_copyin_ignore() return *void* instead of *int*... This patch (of 13): user_regset_copyin_ignore() always returns 0, so checking its result seems pointless -- don't do this anymore... Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Sergey Shtylyov <[email protected]> Cc: Brian Cain <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Christophe Leroy <[email protected]> # powerpc Cc: David S. Miller <[email protected]> Cc: Dinh Nguyen <[email protected]> Cc: Helge Deller <[email protected]> Cc: James Bottomley <[email protected]> Cc: Jonas Bonn <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Nicholas Piggin <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Rich Felker <[email protected]> Cc: Russell King <[email protected]> Cc: Stafford Horne <[email protected]> Cc: Stefan Kristiansson <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Will Deacon <[email protected]> Cc: Yoshinori Sato <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
2022-04-25ARC: implement syscall tracepointsSergey Matyukevich1-3/+18
Implement all the bits required to support HAVE_SYSCALL_TRACEPOINTS according to Documentation/trace/ftrace-design.rst. Signed-off-by: Sergey Matyukevich <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2022-04-25ARC: enable HAVE_REGS_AND_STACK_ACCESS_API featureSergey Matyukevich1-0/+119
Enable HAVE_REGS_AND_STACK_ACCESS_API feature for ARC architecture, including ARCcompact and ARCv2 flavors. Add supporting functions and defines. Signed-off-by: Sergey Matyukevich <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2022-03-10ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.hEric W. Biederman1-3/+2
Rename tracehook_report_syscall_{entry,exit} to ptrace_report_syscall_{entry,exit} and place them in ptrace.h There is no longer any generic tracehook infractructure so make these ptrace specific functions ptrace specific. Reviewed-by: Kees Cook <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: "Eric W. Biederman" <[email protected]>
2020-07-27arc: switch to ->regset_get()Al Viro1-90/+58
NB: it used to do short store; fix is needed earlier in the series. Signed-off-by: Al Viro <[email protected]>
2020-04-12arc: ptrace: hard-code "arc" instead of UTS_MACHINEMasahiro Yamada1-1/+1
ARC uses the UTS_MACHINE defined in the top Makefile as follows: UTS_MACHINE := $(ARCH) We know it is "arc" when we are building the kernel for ARC. Hard-code user_regset_view::name, like many other architectures do. Signed-off-by: Masahiro Yamada <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500Thomas Gleixner1-4/+1
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Enrico Weigelt <[email protected]> Reviewed-by: Kate Stewart <[email protected]> Reviewed-by: Allison Randal <[email protected]> Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
2017-05-03ARCv2: ptrace: provide regset for accumulator/r30 regsVineet Gupta1-3/+59
Signed-off-by: Vineet Gupta <[email protected]>
2017-03-02sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar1-0/+1
<linux/sched/task_stack.h> We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Signed-off-by: Ingo Molnar <[email protected]>
2015-06-22ARCv2: Support for ARCv2 ISA and HS38x coresVineet Gupta1-1/+1
The notable features are: - SMP configurations of upto 4 cores with coherency - Optional L2 Cache and IO-Coherency - Revised Interrupt Architecture (multiple priorites, reg banks, auto stack switch, auto regfile save/restore) - MMUv4 (PIPT dcache, Huge Pages) - Instructions for * 64bit load/store: LDD, STD * Hardware assisted divide/remainder: DIV, REM * Function prologue/epilogue: ENTER_S, LEAVE_S * IRQ enable/disable: CLRI, SETI * pop count: FFS, FLS * SETcc, BMSKN, XBFU... Signed-off-by: Vineet Gupta <[email protected]>
2015-06-19ARC: Make way for pt_regs != user_regs_structVineet Gupta1-7/+83
These have been register compatible so far. However ARCv2 mandates different pt_regs layout (due to h/w auto save). To keep pt_regs same for both, we start by removing the assumption - used mainly for block copies between the 2 structs in signal handling and ptrace Signed-off-by: Vineet Gupta <[email protected]>
2014-06-26ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)Anton Kolesov1-0/+4
This patch adds implementation of GET_THREAD_AREA ptrace request type. This is required by GDB to debug NPTL applications. Signed-off-by: Anton Kolesov <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2013-10-12ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"Vineet Gupta1-1/+1
ARCompact TRAP_S insn used for breakpoints, commits before exception is taken (updating architectural PC). So ptregs->ret contains next-PC and not the breakpoint PC itself. This is different from other restartable exceptions such as TLB Miss where ptregs->ret has exact faulting PC. gdb needs to know exact-PC hence ARC ptrace GETREGSET provides for @stop_pc which returns ptregs->ret vs. EFA depending on the situation. However, writing stop_pc (SETREGSET request), which updates ptregs->ret doesn't makes sense stop_pc doesn't always correspond to that reg as described above. This was not an issue so far since user_regs->ret / user_regs->stop_pc had same value and both writing to ptregs->ret was OK, needless, but NOT broken, hence not observed. With gdb "jump", they diverge, and user_regs->ret updating ptregs is overwritten immediately with stop_pc, which this patch fixes. Reported-by: Anton Kolesov <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
2013-06-22ARC: pt_regs update #3: Remove unused gutter at start of callee_regsVineet Gupta1-2/+4
This is trickier than prev two: * context switching code saves kernel mode callee regs in the format of struct callee_regs thus needs adjustment. This also reduces the height of topmost kernel stack frame by 1 word. * Since kernel stack unwinder is sensitive to height of topmost kernel stack frame, that needs a word of adjustment too. ptrace needs a bit of updating since pt_regs now diverges from user_regs_struct. Signed-off-by: Vineet Gupta <[email protected]>
2013-06-22ARC: pt_regs update #2: Remove unused gutter at start of pt_regsVineet Gupta1-0/+8
Signed-off-by: Vineet Gupta <[email protected]>
2013-02-15ARC: ptrace supportVineet Gupta1-2/+134
Signed-off-by: Vineet Gupta <[email protected]> Acked-by: Arnd Bergmann <[email protected]>
2013-02-15ARC: Last bits (stubs) to get to a running kernel with UARTVineet Gupta1-0/+26
This was part of port buildup strategy from Arnd to have a minimal kernel at first and then add optional features (stacktracing, ptrace, smp, kprobes, oprofile....) Signed-off-by: Vineet Gupta <[email protected]>
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