kernel/linux.git/arch/arc/include/asm/ptrace.h, branch linux-7.0.y

ARC: Replace ASSEMBLY with ASSEMBLER in the non-uapi headers

2025-06-09T16:18:12+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Thomas Huth Signed-off-by: Vineet Gupta

ARC: Fix -Wmissing-prototypes warnings

2024-04-02T01:40:39+00:00

| ../arch/arc/kernel/kprobes.c:193:15: warning: no previous prototype for 'arc_kprobe_handler' [-Wmissing-prototypes] | 193 | int __kprobes arc_kprobe_handler(unsigned long addr, struct pt_regs *regs) | |../arch/arc/kernel/ptrace.c:342:16: warning: no previous prototype for 'syscall_trace_enter' [-Wmissing-prototypes] | 342 | asmlinkage int syscall_trace_enter(struct pt_regs *regs) Link: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240325/testrun/23149630/suite/build/test/gcc-9-defconfig/log Reported-by: Linux Kernel Functional Testing Signed-off-by: Vineet Gupta

ARC: entry: SAVE_ABI_CALLEE_REG: ISA/ABI specific helper

2023-12-09T00:30:24+00:00

And for ARcompact variant replace the PUSH/POP macros with gas provided push/pop pseudo-instructions This allows ISA specific implementation e.g. Current ARCv2 PUSH/POP could be replaced with STD/LDL to save 2 registers at a time (w/o bothering with SP update each time) or perhaps use ENTER_S/LEAVE_S to reduce code size For ARCv3 ABI changed so callee regs are now r14-r26 (vs. r13-r25) thus would need a different implementation. Signed-off-by: Vineet Gupta

ARC: pt_regs: create seperate type for ecr

2023-08-18T17:30:47+00:00

Reduces duplication in each ISA specific pt_regs Tested-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202308151342.ROQ9Urvv-lkp@intel.com Signed-off-by: Vineet Gupta

ARCv2: entry: rearrange pt_regs slightly

2023-08-18T17:30:47+00:00

Instead of r26,fp,sp,r12,r30 order as fp,r30,r12,r26,sp - keeps SP at well known position (right abive hardware autosave) - r26,r12 saved specifically for ARCv2 (and not in ARCv3) kept closer for easy ifdef'ry later Signed-off-by: Vineet Gupta

ARC: entry: rework (non-functional)

2023-08-18T03:31:59+00:00

- comments update - rename syscall_trace_entry - use PT_xxx in entry code Signed-off-by: Vineet Gupta

ARC: entry: use gp to cache task pointer (vs. r25)

2023-08-18T03:31:59+00:00

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- toggle Signed-off-by: Vineet Gupta

ARC: -Wmissing-prototype warning fixes

2023-08-13T23:53:02+00:00

Anrd reported [1] new compiler warnings due to -Wmissing-protype. These are for non static functions mostly used in asm code hence not exported already. Fix this by adding the prototypes. [1] https://lore.kernel.org/lkml/20230810141947.1236730-1-arnd@kernel.org Reviewed-by: Arnd Bergmann Signed-off-by: Vineet Gupta

ARC: enable HAVE_REGS_AND_STACK_ACCESS_API feature

2022-04-25T20:09:47+00:00

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 Signed-off-by: Vineet Gupta

ARC: Add instruction_pointer_set() API

2021-10-01T01:24:07+00:00

Add instruction_pointer_set() API for arc. Link: https://lkml.kernel.org/r/163163050148.489837.15187799269793560256.stgit@devnote2 Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware)