kernel/linux.git/arch/powerpc/include/asm/ppc_asm.h, branch v6.2.2

powerpc/64: Add interrupt register sanitisation macros

2022-12-02T09:45:57+00:00

Include in asm/ppc_asm.h macros to be used in multiple successive patches to implement zeroising architected registers in interrupt handlers. Registers will be sanitised in this fashion in future patches to reduce the speculation influence of user-controlled register values. These mitigations will be configurable through the CONFIG_INTERRUPT_SANITIZE_REGISTERS Kconfig option. Included are macros for conditionally zeroising registers and restoring as required with the mitigation enabled. With the mitigation disabled, non-volatiles must be restored on demand at separate locations to those required by the mitigation. Reviewed-by: Nicholas Piggin Signed-off-by: Rohan McLure Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20221201071019.1953023-2-rmclure@linux.ibm.com

powerpc/64e: provide an addressing macro for use with TOC in alternate register

2022-09-28T09:22:12+00:00

The interrupt entry code carefully saves a minimal number of registers, so in some places the TOC is required, it is loaded into a different register, so provide a macro that can supply an alternate TOC register. This continues to use got addressing because TOC-relative results in "got/toc optimization is not supported" messages by the linker. Having r2 be one of the saved registers and using that for TOC addressing may be the best way to avoid that and switch this to TOC addressing. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220926034057.2360083-6-npiggin@gmail.com

powerpc/64: provide a helper macro to load r2 with the kernel TOC

2022-09-28T09:22:12+00:00

A later change stops the kernel using r2 and loads it with a poison value. Provide a PACATOC loading abstraction which can hide this detail. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220926034057.2360083-5-npiggin@gmail.com

powerpc/64: switch asm helpers from GOT to TOC relative addressing

2022-09-28T09:22:12+00:00

There is no need to use GOT addressing within the kernel. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220926034057.2360083-4-npiggin@gmail.com

powerpc: Add ZEROIZE_GPRS macros for register clears

2022-09-26T13:00:14+00:00

Provide register zeroing macros, following the same convention as existing register stack save/restore macros, to be used in later change to concisely zero a sequence of consecutive gprs. The resulting macros are called ZEROIZE_GPRS and ZEROIZE_NVGPRS, keeping with the naming of the accompanying restore and save macros, and usage of zeroize to describe this operation elsewhere in the kernel. Signed-off-by: Rohan McLure Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220921065605.1051927-4-rmclure@linux.ibm.com

powerpc: Remove CONFIG_PPC_FSL_BOOK3E

2022-09-26T13:00:13+00:00

CONFIG_PPC_FSL_BOOK3E is redundant with CONFIG_PPC_E500. Remove it. And rename five files accordingly. Signed-off-by: Christophe Leroy [mpe: Rename include guards to match new file names] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/795cb93b88c9a0279289712e674f39e3b108a1b4.1663606876.git.christophe.leroy@csgroup.eu

powerpc: Remove CONFIG_PPC_BOOK3E

2022-09-26T13:00:13+00:00

CONFIG_PPC_BOOK3E is redundant with CONFIG_PPC_BOOK3E_64. The later is more explicit about the fact that it's a 64 bits target. Remove CONFIG_PPC_BOOK3E. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5d0891490813c19cdcfc04678f512ea68cba3e64.1663606876.git.christophe.leroy@csgroup.eu

powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2}

2022-05-19T13:11:29+00:00

Replace all uses of PPC64_ELF_ABI_v1 and PPC64_ELF_ABI_v2 by resp CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/ba13d59e8c50bc9aa6328f1c7f0c0d0278e0a3a7.1652074503.git.christophe.leroy@csgroup.eu

powerpc: Remove remaining stab codes

2022-02-23T03:49:27+00:00

Following commit 12318163737c ("powerpc/32: Remove remaining .stabs annotations"), stabs code are not used anymore. Remove them. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/d8b33342d7454f6ca4f368f5206896558dfa06f4.1645538722.git.christophe.leroy@csgroup.eu

powerpc/32: Remove _ENTRY() macro

2022-02-07T10:03:10+00:00

_ENTRY() is now redundant with _GLOBAL(). Remove it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/62a35f8dde2bb74c8d0d7a5430cce07a5a3a6fb6.1638273868.git.christophe.leroy@csgroup.eu