kernel/linux.git/arch/powerpc/include/asm/exception-64e.h, branch linux-7.0.y

powerpc: Replace ASSEMBLY with ASSEMBLER in non-uapi headers

2025-09-01T07:53:29+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This is bad since macros starting with two underscores are names that are reserved by the C language. It can also be very confusing for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), apart from tweaking two comments manually in arch/powerpc/include/asm/bug.h and arch/powerpc/include/asm/kasan.h (which did not have proper underscores at the end) and fixing a checkpatch error about spaces in arch/powerpc/include/asm/spu_csa.h. Signed-off-by: Thomas Huth Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250801082007.32904-3-thuth@redhat.com

powerpc/code-patching: Move patch_exception() outside code-patching.c

2021-12-23T11:36:55+00:00

patch_exception() is dedicated to book3e/64 is nothing more than a normal use of patch_branch(), so move it into a place dedicated to book3e/64. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/0968622b98b1fb51838c35b844c42ad6609de62e.1638446239.git.christophe.leroy@csgroup.eu

powerpc/64e: Drop dead BOOK3E_MMU_TLB_STATS code

2020-07-29T11:08:12+00:00

This code was merged 11 years ago in commit 13363ab9b9d0 ("powerpc: Add definitions used by exception handling on 64-bit Book3E") but was never able to be built because CONFIG_BOOK3E_MMU_TLB_STATS never existed. Remove it. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200724131728.1643966-4-mpe@ellerman.id.au

powerpc: Select ARCH_HAS_MEMBARRIER_SYNC_CORE

2020-07-23T07:43:23+00:00

powerpc return from interrupt and return from system call sequences are context synchronising. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200716013522.338318-1-npiggin@gmail.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

powerpc/64: Add macros for annotating the destination of rfid/hrfid

2018-01-09T16:07:30+00:00

The rfid/hrfid ((Hypervisor) Return From Interrupt) instruction is used for switching from the kernel to userspace, and from the hypervisor to the guest kernel. However it can and is also used for other transitions, eg. from real mode kernel code to virtual mode kernel code, and it's not always clear from the code what the destination context is. To make it clearer when reading the code, add macros which encode the expected destination context. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc/e6500: hw tablewalk: make sure we invalidate and write to the same tlb entry

2015-10-27T23:14:40+00:00

In order to workaround Erratum A-008139, we have to invalidate the tlb entry with tlbilx before overwriting. Due to the performance consideration, we don't add any memory barrier when acquire/release the tcd lock. This means the two load instructions for esel_next do have the possibility to return different value. This is definitely not acceptable due to the Erratum A-008139. We have two options to fix this issue: a) Add memory barrier when acquire/release tcd lock to order the load/store to esel_next. b) Just make sure to invalidate and write to the same tlb entry and tolerate the race that we may get the wrong value and overwrite the tlb entry just updated by the other thread. We observe better performance using option b. So reserve an additional register to save the value of the esel_next. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc/book3e: support CONFIG_RELOCATABLE

2015-10-27T23:13:27+00:00

book3e is different with book3s since 3s includes the exception vectors code in head_64.S as it relies on absolute addressing which is only possible within this compilation unit. So we have to get that label address with got. And when boot a relocated kernel, we should reset ipvr properly again after .relocate. Signed-off-by: Tiejun Chen [scottwood: cleanup and ifdef removal] Signed-off-by: Scott Wood

powerpc: No need to use dot symbols when branching to a function

2014-04-23T00:05:16+00:00

binutils is smart enough to know that a branch to a function descriptor is actually a branch to the functions text address. Alan tells me that binutils has been doing this for 9 years. Signed-off-by: Anton Blanchard

powerpc/booke64: Use SPRG_TLB_EXFRAME on bolted handlers

2014-03-20T00:57:15+00:00

While bolted handlers (including e6500) do not need to deal with a TLB miss recursively causing another TLB miss, nested TLB misses can still happen with crit/mc/debug exceptions -- so we still need to honor SPRG_TLB_EXFRAME. We don't need to spend time modifying it in the TLB miss fastpath, though -- the special level exception will handle that. Signed-off-by: Scott Wood Cc: Mihai Caraman Cc: kvm-ppc@vger.kernel.org