Pull arm64 updates from Will Deacon: "A sizeable pile of arm64 updates for 5.8. Summary below, but the big two features are support for Branch Target Identification and Clang's Shadow Call stack. The latter is currently arm64-only, but the high-level parts are all in core code so it could easily be adopted by other architectures pending toolchain support Branch Target Identification (BTI): - Support for ARMv8.5-BTI in both user- and kernel-space. This allows branch targets to limit the types of branch from which they can be called and additionally prevents branching to arbitrary code, although kernel support requires a very recent toolchain. - Function annotation via SYM_FUNC_START() so that assembly functions are wrapped with the relevant "landing pad" instructions. - BPF and vDSO updates to use the new instructions. - Addition of a new HWCAP and exposure of BTI capability to userspace via ID register emulation, along with ELF loader support for the BTI feature in .note.gnu.property. - Non-critical fixes to CFI unwind annotations in the sigreturn trampoline. Shadow Call Stack (SCS): - Support for Clang's Shadow Call Stack feature, which reserves platform register x18 to point at a separate stack for each task that holds only return addresses. This protects function return control flow from buffer overruns on the main stack. - Save/restore of x18 across problematic boundaries (user-mode, hypervisor, EFI, suspend, etc). - Core support for SCS, should other architectures want to use it too. - SCS overflow checking on context-switch as part of the existing stack limit check if CONFIG_SCHED_STACK_END_CHECK=y. CPU feature detection: - Removed numerous "SANITY CHECK" errors when running on a system with mismatched AArch32 support at EL1. This is primarily a concern for KVM, which disabled support for 32-bit guests on such a system. - Addition of new ID registers and fields as the architecture has been extended. Perf and PMU drivers: - Minor fixes and cleanups to system PMU drivers. Hardware errata: - Unify KVM workarounds for VHE and nVHE configurations. - Sort vendor errata entries in Kconfig. Secure Monitor Call Calling Convention (SMCCC): - Update to the latest specification from Arm (v1.2). - Allow PSCI code to query the SMCCC version. Software Delegated Exception Interface (SDEI): - Unexport a bunch of unused symbols. - Minor fixes to handling of firmware data. Pointer authentication: - Add support for dumping the kernel PAC mask in vmcoreinfo so that the stack can be unwound by tools such as kdump. - Simplification of key initialisation during CPU bringup. BPF backend: - Improve immediate generation for logical and add/sub instructions. vDSO: - Minor fixes to the linker flags for consistency with other architectures and support for LLVM's unwinder. - Clean up logic to initialise and map the vDSO into userspace. ACPI: - Work around for an ambiguity in the IORT specification relating to the "num_ids" field. - Support _DMA method for all named components rather than only PCIe root complexes. - Minor other IORT-related fixes. Miscellaneous: - Initialise debug traps early for KGDB and fix KDB cacheflushing deadlock. - Minor tweaks to early boot state (documentation update, set TEXT_OFFSET to 0x0, increase alignment of PE/COFF sections). - Refactoring and cleanup" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (148 commits) KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h KVM: arm64: Check advertised Stage-2 page size capability arm64/cpufeature: Add get_arm64_ftr_reg_nowarn() ACPI/IORT: Remove the unused __get_pci_rid() arm64/cpuinfo: Add ID_MMFR4_EL1 into the cpuinfo_arm64 context arm64/cpufeature: Add remaining feature bits in ID_AA64PFR1 register arm64/cpufeature: Add remaining feature bits in ID_AA64PFR0 register arm64/cpufeature: Add remaining feature bits in ID_AA64ISAR0 register arm64/cpufeature: Add remaining feature bits in ID_MMFR4 register arm64/cpufeature: Add remaining feature bits in ID_PFR0 register arm64/cpufeature: Introduce ID_MMFR5 CPU register arm64/cpufeature: Introduce ID_DFR1 CPU register arm64/cpufeature: Introduce ID_PFR2 CPU register arm64/cpufeature: Make doublelock a signed feature in ID_AA64DFR0 arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register arm64/cpufeature: Add explicit ftr_id_isar0[] for ID_ISAR0 register arm64: mm: Add asid_gen_match() helper firmware: smccc: Fix missing prototype warning for arm_smccc_version_init arm64: vdso: Fix CFI directives in sigreturn trampoline arm64: vdso: Don't prefix sigreturn trampoline with a BTI C instruction ...
Showing the changes to include/uapi/linux (1 of 159 files). Show all
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| @@ -36,6 +36,7 @@ typedef __s64 Elf64_Sxword; · 35 unmodified lines | |||
| 36 | #define PT_LOPROC 0x70000000 | 36 | #define PT_LOPROC 0x70000000 |
| 37 | #define PT_HIPROC 0x7fffffff | 37 | #define PT_HIPROC 0x7fffffff |
| 38 | #define PT_GNU_EH_FRAME 0x6474e550 | 38 | #define PT_GNU_EH_FRAME 0x6474e550 |
| 39 | #define PT_GNU_PROPERTY 0x6474e553 | ||
| 39 | 40 | ||
| 40 | #define PT_GNU_STACK (PT_LOOS + 0x474e551) | 41 | #define PT_GNU_STACK (PT_LOOS + 0x474e551) |
| 41 | 42 | ||
| @@ -367,6 +368,7 @@ typedef struct elf64_shdr { · 325 unmodified lines | |||
| 367 | * Notes used in ET_CORE. Architectures export some of the arch register sets | 368 | * Notes used in ET_CORE. Architectures export some of the arch register sets |
| 368 | * using the corresponding note types via the PTRACE_GETREGSET and | 369 | * using the corresponding note types via the PTRACE_GETREGSET and |
| 369 | * PTRACE_SETREGSET requests. | 370 | * PTRACE_SETREGSET requests. |
| 371 | * The note name for all these is "LINUX". | ||
| 370 | */ | 372 | */ |
| 371 | #define NT_PRSTATUS 1 | 373 | #define NT_PRSTATUS 1 |
| 372 | #define NT_PRFPREG 2 | 374 | #define NT_PRFPREG 2 |
| @@ -429,6 +431,9 @@ typedef struct elf64_shdr { · 56 unmodified lines | |||
| 429 | #define NT_MIPS_FP_MODE 0x801 /* MIPS floating-point mode */ | 431 | #define NT_MIPS_FP_MODE 0x801 /* MIPS floating-point mode */ |
| 430 | #define NT_MIPS_MSA 0x802 /* MIPS SIMD registers */ | 432 | #define NT_MIPS_MSA 0x802 /* MIPS SIMD registers */ |
| 431 | 433 | ||
| 434 | /* Note types with note name "GNU" */ | ||
| 435 | #define NT_GNU_PROPERTY_TYPE_0 5 | ||
| 436 | |||
| 432 | /* Note header in a PT_NOTE section */ | 437 | /* Note header in a PT_NOTE section */ |
| 433 | typedef struct elf32_note { | 438 | typedef struct elf32_note { |
| 434 | Elf32_Word n_namesz; /* Name size */ | 439 | Elf32_Word n_namesz; /* Name size */ |
| @@ -443,4 +448,10 @@ typedef struct elf64_note { · 8 unmodified lines | |||
| 443 | Elf64_Word n_type; /* Content type */ | 448 | Elf64_Word n_type; /* Content type */ |
| 444 | } Elf64_Nhdr; | 449 | } Elf64_Nhdr; |
| 445 | 450 | ||
| 451 | /* .note.gnu.property types for EM_AARCH64: */ | ||
| 452 | #define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000 | ||
| 453 | |||
| 454 | /* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */ | ||
| 455 | #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0) | ||
| 456 | |||
| 446 | #endif /* _UAPI_LINUX_ELF_H */ | 457 | #endif /* _UAPI_LINUX_ELF_H */ |