kernel/linux.git/arch/powerpc/include/asm/ppc-opcode.h, branch v6.6.132

powerpc/inst: add PPC_TLBILX_LPID

2023-08-16T13:54:48+00:00

Clang didn't recognize the instruction tlbilxlpid. This was fixed in clang-18 [0] then backported to clang-17 [1]. To support clang-16 and older, rather than using that instruction bare in inline asm, add it to ppc-opcode.h and use that macro as is done elsewhere for other instructions. Link: https://github.com/ClangBuiltLinux/linux/issues/1891 Link: https://github.com/llvm/llvm-project/issues/64080 Link: https://github.com/llvm/llvm-project/commit/53648ac1d0c953ae6d008864dd2eddb437a92468 [0] Link: https://github.com/llvm/llvm-project-release-prs/commit/0af7e5e54a8c7ac665773ac1ada328713e8338f5 [1] Reported-by: kernel test robot Closes: https://lore.kernel.org/llvm/202307211945.TSPcyOhh-lkp@intel.com/ Suggested-by: Michael Ellerman Signed-off-by: Nick Desaulniers Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/20230803-ppc_tlbilxlpid-v3-1-ca84739bfd73@google.com

powerpc/dexcr: Handle hashchk exception

2023-06-19T07:36:26+00:00

Recognise and pass the appropriate signal to the user program when a hashchk instruction triggers. This is independent of allowing configuration of DEXCR[NPHIE], as a hypervisor can enforce this aspect regardless of the kernel. The signal mirrors how ARM reports their similar check failure. For example, their FPAC handler in arch/arm64/kernel/traps.c do_el0_fpac() does this. When we fail to read the instruction that caused the fault we send a segfault, similar to how emulate_math() does it. Signed-off-by: Benjamin Gray Signed-off-by: Michael Ellerman Link: https://msgid.link/20230616034846.311705-5-bgray@linux.ibm.com

powerpc/64: vmlinux support building with PCREL addresing

2023-04-20T02:59:21+00:00

PC-Relative or PCREL addressing is an extension to the ELF ABI which uses Power ISA v3.1 PC-relative instructions to calculate addresses, rather than the traditional TOC scheme. Add an option to build vmlinux using pcrel addressing. Modules continue to use TOC addressing. - TOC address helpers and r2 are poisoned with -1 when running vmlinux. r2 could be used for something useful once things are ironed out. - Assembly must call C functions with @notoc annotation, or the linker complains aobut a missing nop after the call. This is done with the CFUNC macro introduced earlier. - Boot: with the exception of prom_init, the execution branches to the kernel virtual address early in boot, before any addresses are generated, which ensures 34-bit pcrel addressing does not miss the high PAGE_OFFSET bits. TOC relative addressing has a similar requirement. prom_init does not go to the virtual address and its addresses should not carry over to the post-prom kernel. - Ftrace trampolines are converted from TOC addressing to pcrel addressing, including module ftrace trampolines that currently use the kernel TOC to find ftrace target functions. - BPF function prologue and function calling generation are converted from TOC to pcrel. - copypage_64.S has an interesting problem, prefixed instructions have alignment restrictions so the linker can add padding, which makes the assembler treat the difference between two local labels as non-constant even if alignment is arranged so padding is not required. This may need toolchain help to solve nicely, for now move the prefix instruction out of the alternate patch section to work around it. This reduces kernel text size by about 6%. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230408021752.862660-6-npiggin@gmail.com

powerpc: add ISA v3.0 / v3.1 wait opcode macro

2022-09-28T09:22:10+00:00

The wait instruction encoding changed between ISA v2.07 and ISA v3.0. In v3.1 the instruction gained a new field. Update the PPC_WAIT macro to the current encoding. Rename the older incompatible one with a _v203 suffix as it was introduced in v2.03 (the WC field was introduced in v2.07 but the kernel only uses WC=0). Reviewed-by: Segher Boessenkool Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220920122259.363092-1-npiggin@gmail.com

powerpc/ppc-opcode: Fix PPC_RAW_TW()

2022-08-10T05:39:37+00:00

PPC_RAW_TW() is erroneously defined with base code 0x7f000008 instead of 0x7c000008. That's invisible because its only user is PPC_RAW_TRAP() which is 0x7fe00008, but fix it anyway to avoid any risk of future bug. Fixes: d00d762daf12 ("powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and PPC_RAW_TW()") Reported-by: Naveen N. Rao Signed-off-by: Christophe Leroy Reviewed-by: Naveen N. Rao Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/eca9251f1e1f82c4c46ec6380ddb28356ab3fdfe.1659527244.git.christophe.leroy@csgroup.eu

powerpc: Don't hide eh field of lwarx behind a macro

2022-08-10T05:32:02+00:00

The eh field must remain 0 for PPC32 and is only used by PPC64. Don't hide that behind a macro, just leave the responsibility to the user. At the time being, the only users of PPC_RAW_L{WDQ}ARX are setting the eh field to 0, so the special handling of __PPC_EH is useless. Just take the value given by the caller. Same for DEFINE_TESTOP(), don't do special handling in that macro, ensure the caller hands over the proper eh value. Signed-off-by: Christophe Leroy [mpe: Use 'n' constraint per Segher] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/8b9c8a1a14f9143552a85fcbf96698224a8c2469.1659430931.git.christophe.leroy@csgroup.eu

powerpc/ppc-opcode: Define and use PPC_RAW_SETB()

2022-07-27T11:36:05+00:00

We have PPC_INST_SETB then build the 'setb' instruction in the user. Instead, define PPC_RAW_SETB() and use it. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b08a4f26919a8f8cdcf7544ab552d9c1c63418b5.1657205708.git.christophe.leroy@csgroup.eu

powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and PPC_RAW_TW()

2022-07-27T11:36:05+00:00

Add and use PPC_RAW_TRAP() instead of opencoding. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/52c7e522e56a38e3ff0363906919445920005a8f.1657205708.git.christophe.leroy@csgroup.eu

powerpc/opcodes: Remove unused PPC_INST_XXX macros

2022-05-22T05:58:27+00:00

The following PPC_INST_XXX macros are not used anymore outside ppc-opcode.h: - PPC_INST_LD - PPC_INST_STD - PPC_INST_ADDIS - PPC_INST_ADD - PPC_INST_DIVD Remove them. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/8c28636126f69141419953b5638b4a908c184dc1.1652074503.git.christophe.leroy@csgroup.eu

powerpc/inst: Remove PPC_INST_BL

2022-05-22T05:58:27+00:00

Convert last users of PPC_INST_BL to PPC_RAW_BL() And remove PPC_INST_BL. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/d9eacb758e7ae7cf224211ebe3f6f7d409a333be.1652074503.git.christophe.leroy@csgroup.eu