mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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powerpc updates for 4.9
Highlights:
- Major rework of Book3S 64-bit exception vectors (Nicholas Piggin)
- Use gas sections for arranging exception vectors et. al.
- Large set of TM cleanups and selftests (Cyril Bur)
- Enable transactional memory (TM) lazily for userspace (Cyril Bur)
- Support for XZ compression in the zImage wrapper (Oliver O'Halloran)
- Add support for bpf constant blinding (Naveen N. Rao)
- Beginnings of upstream support for PA Semi Nemo motherboards (Darren Stevens)
Fixes:
- Ensure .mem(init|exit).text are within _stext/_etext (Michael Ellerman)
- xmon: Don't use ld on 32-bit (Michael Ellerman)
- vdso64: Use double word compare on pointers (Anton Blanchard)
- powerpc/nvram: Fix an incorrect partition merge (Pan Xinhui)
- powerpc: Fix usage of _PAGE_RO in hugepage (Christophe Leroy)
- powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K (Aneesh Kumar K.V)
- Fix memory leak in queue_hotplug_event() error path (Andrew Donnellan)
- Replay hypervisor maintenance interrupt first (Nicholas Piggin)
Cleanups & features:
- Sparse fixes/cleanups (Daniel Axtens)
- Preserve CFAR value on SLB miss caused by access to bogus address (Paul Mackerras)
- Radix MMU fixups for POWER9 (Aneesh Kumar K.V)
- Support for setting used_(vsr|vr|spe) in sigreturn path (for CRIU) (Simon Guo)
- Optimise syscall entry for virtual, relocatable case (Nicholas Piggin)
- Optimise MSR handling in exception handling (Nicholas Piggin)
- Support for kexec with Radix MMU (Benjamin Herrenschmidt)
- powernv EEH fixes (Russell Currey)
- Suprise PCI hotplug support for powernv (Gavin Shan)
- Endian/sparse fixes for powernv PCI (Gavin Shan)
- Defconfig updates (Anton Blanchard)
- Various performance optimisations (Anton Blanchard)
- Align hot loops of memset() and backwards_memcpy()
- During context switch, check before setting mm_cpumask
- Remove static branch prediction in atomic{, 64}_add_unless
- Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little endian
- Set default CPU type to POWER8 for little endian builds
- KVM: PPC: Book3S HV: Migrate pinned pages out of CMA (Balbir Singh)
- cxl: Flush PSL cache before resetting the adapter (Frederic Barrat)
- cxl: replace loop with for_each_child_of_node(), remove unneeded of_node_put() (Andrew Donnellan)
- Fix HV facility unavailable to use correct handler (Nicholas Piggin)
- Remove unnecessary syscall trampoline (Nicholas Piggin)
- fadump: Fix build break when CONFIG_PROC_VMCORE=n (Michael Ellerman)
- Quieten EEH message when no adapters are found (Anton Blanchard)
- powernv: Add PHB register dump debugfs handle (Russell Currey)
- Use kprobe blacklist for exception handlers & asm functions (Nicholas Piggin)
- Document the syscall ABI (Nicholas Piggin)
- MAINTAINERS: Update cxl maintainers (Michael Neuling)
- powerpc: Remove all usages of NO_IRQ (Michael Ellerman)
Minor cleanups:
- Andrew Donnellan, Christophe Leroy, Colin Ian King, Cyril Bur, Frederic Barrat,
Pan Xinhui, PrasannaKumar Muralidharan, Rui Teng, Simon Guo.
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Merge tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman:
"Highlights:
- Major rework of Book3S 64-bit exception vectors (Nicholas Piggin)
- Use gas sections for arranging exception vectors et. al.
- Large set of TM cleanups and selftests (Cyril Bur)
- Enable transactional memory (TM) lazily for userspace (Cyril Bur)
- Support for XZ compression in the zImage wrapper (Oliver
O'Halloran)
- Add support for bpf constant blinding (Naveen N. Rao)
- Beginnings of upstream support for PA Semi Nemo motherboards
(Darren Stevens)
Fixes:
- Ensure .mem(init|exit).text are within _stext/_etext (Michael
Ellerman)
- xmon: Don't use ld on 32-bit (Michael Ellerman)
- vdso64: Use double word compare on pointers (Anton Blanchard)
- powerpc/nvram: Fix an incorrect partition merge (Pan Xinhui)
- powerpc: Fix usage of _PAGE_RO in hugepage (Christophe Leroy)
- powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K
(Aneesh Kumar K.V)
- Fix memory leak in queue_hotplug_event() error path (Andrew
Donnellan)
- Replay hypervisor maintenance interrupt first (Nicholas Piggin)
Various performance optimisations (Anton Blanchard):
- Align hot loops of memset() and backwards_memcpy()
- During context switch, check before setting mm_cpumask
- Remove static branch prediction in atomic{, 64}_add_unless
- Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little
endian
- Set default CPU type to POWER8 for little endian builds
Cleanups & features:
- Sparse fixes/cleanups (Daniel Axtens)
- Preserve CFAR value on SLB miss caused by access to bogus address
(Paul Mackerras)
- Radix MMU fixups for POWER9 (Aneesh Kumar K.V)
- Support for setting used_(vsr|vr|spe) in sigreturn path (for CRIU)
(Simon Guo)
- Optimise syscall entry for virtual, relocatable case (Nicholas
Piggin)
- Optimise MSR handling in exception handling (Nicholas Piggin)
- Support for kexec with Radix MMU (Benjamin Herrenschmidt)
- powernv EEH fixes (Russell Currey)
- Suprise PCI hotplug support for powernv (Gavin Shan)
- Endian/sparse fixes for powernv PCI (Gavin Shan)
- Defconfig updates (Anton Blanchard)
- KVM: PPC: Book3S HV: Migrate pinned pages out of CMA (Balbir Singh)
- cxl: Flush PSL cache before resetting the adapter (Frederic Barrat)
- cxl: replace loop with for_each_child_of_node(), remove unneeded
of_node_put() (Andrew Donnellan)
- Fix HV facility unavailable to use correct handler (Nicholas
Piggin)
- Remove unnecessary syscall trampoline (Nicholas Piggin)
- fadump: Fix build break when CONFIG_PROC_VMCORE=n (Michael
Ellerman)
- Quieten EEH message when no adapters are found (Anton Blanchard)
- powernv: Add PHB register dump debugfs handle (Russell Currey)
- Use kprobe blacklist for exception handlers & asm functions
(Nicholas Piggin)
- Document the syscall ABI (Nicholas Piggin)
- MAINTAINERS: Update cxl maintainers (Michael Neuling)
- powerpc: Remove all usages of NO_IRQ (Michael Ellerman)
Minor cleanups:
- Andrew Donnellan, Christophe Leroy, Colin Ian King, Cyril Bur,
Frederic Barrat, Pan Xinhui, PrasannaKumar Muralidharan, Rui Teng,
Simon Guo"
* tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits)
powerpc/bpf: Add support for bpf constant blinding
powerpc/bpf: Implement support for tail calls
powerpc/bpf: Introduce accessors for using the tmp local stack space
powerpc/fadump: Fix build break when CONFIG_PROC_VMCORE=n
powerpc: tm: Enable transactional memory (TM) lazily for userspace
powerpc/tm: Add TM Unavailable Exception
powerpc: Remove do_load_up_transact_{fpu,altivec}
powerpc: tm: Rename transct_(*) to ck(\1)_state
powerpc: tm: Always use fp_state and vr_state to store live registers
selftests/powerpc: Add checks for transactional VSXs in signal contexts
selftests/powerpc: Add checks for transactional VMXs in signal contexts
selftests/powerpc: Add checks for transactional FPUs in signal contexts
selftests/powerpc: Add checks for transactional GPRs in signal contexts
selftests/powerpc: Check that signals always get delivered
selftests/powerpc: Add TM tcheck helpers in C
selftests/powerpc: Allow tests to extend their kill timeout
selftests/powerpc: Introduce GPR asm helper header file
selftests/powerpc: Move VMX stack frame macros to header file
selftests/powerpc: Rework FPU stack placement macros and move to header file
selftests/powerpc: Check for VSX preservation across userspace preemption
...
This commit is contained in:
Linus Torvalds
commit
07021b4359
227 changed files with 5466 additions and 2926 deletions
105
Documentation/powerpc/syscall64-abi.txt
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105
Documentation/powerpc/syscall64-abi.txt
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===============================================
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Power Architecture 64-bit Linux system call ABI
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===============================================
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syscall
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=======
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syscall calling sequence[*] matches the Power Architecture 64-bit ELF ABI
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specification C function calling sequence, including register preservation
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rules, with the following differences.
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[*] Some syscalls (typically low-level management functions) may have
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different calling sequences (e.g., rt_sigreturn).
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Parameters and return value
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---------------------------
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The system call number is specified in r0.
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There is a maximum of 6 integer parameters to a syscall, passed in r3-r8.
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Both a return value and a return error code are returned. cr0.SO is the return
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error code, and r3 is the return value or error code. When cr0.SO is clear,
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the syscall succeeded and r3 is the return value. When cr0.SO is set, the
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syscall failed and r3 is the error code that generally corresponds to errno.
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Stack
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-----
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System calls do not modify the caller's stack frame. For example, the caller's
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stack frame LR and CR save fields are not used.
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Register preservation rules
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---------------------------
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Register preservation rules match the ELF ABI calling sequence with the
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following differences:
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r0: Volatile. (System call number.)
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r3: Volatile. (Parameter 1, and return value.)
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r4-r8: Volatile. (Parameters 2-6.)
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cr0: Volatile (cr0.SO is the return error condition)
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cr1, cr5-7: Nonvolatile.
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lr: Nonvolatile.
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All floating point and vector data registers as well as control and status
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registers are nonvolatile.
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Invocation
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----------
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The syscall is performed with the sc instruction, and returns with execution
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continuing at the instruction following the sc instruction.
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Transactional Memory
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--------------------
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Syscall behavior can change if the processor is in transactional or suspended
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transaction state, and the syscall can affect the behavior of the transaction.
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If the processor is in suspended state when a syscall is made, the syscall
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will be performed as normal, and will return as normal. The syscall will be
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performed in suspended state, so its side effects will be persistent according
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to the usual transactional memory semantics. A syscall may or may not result
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in the transaction being doomed by hardware.
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If the processor is in transactional state when a syscall is made, then the
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behavior depends on the presence of PPC_FEATURE2_HTM_NOSC in the AT_HWCAP2 ELF
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auxiliary vector.
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- If present, which is the case for newer kernels, then the syscall will not
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be performed and the transaction will be doomed by the kernel with the
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failure code TM_CAUSE_SYSCALL | TM_CAUSE_PERSISTENT in the TEXASR SPR.
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- If not present (older kernels), then the kernel will suspend the
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transactional state and the syscall will proceed as in the case of a
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suspended state syscall, and will resume the transactional state before
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returning to the caller. This case is not well defined or supported, so this
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behavior should not be relied upon.
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vsyscall
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========
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vsyscall calling sequence matches the syscall calling sequence, with the
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following differences. Some vsyscalls may have different calling sequences.
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Parameters and return value
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---------------------------
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r0 is not used as an input. The vsyscall is selected by its address.
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Stack
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-----
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The vsyscall may or may not use the caller's stack frame save areas.
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Register preservation rules
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---------------------------
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r0: Volatile.
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cr1, cr5-7: Volatile.
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lr: Volatile.
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Invocation
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----------
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The vsyscall is performed with a branch-with-link instruction to the vsyscall
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function address.
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Transactional Memory
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--------------------
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vsyscalls will run in the same transactional state as the caller. A vsyscall
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may or may not result in the transaction being doomed by hardware.
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