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Operations which write to memory and special purpose registers should be restricted on systems with integrity guarantees (such as Secure Boot) and, optionally, to avoid self-destructive behaviors. Add a config option, XMON_DEFAULT_RO_MODE, to set default xmon behavior. The kernel cmdline options xmon=ro and xmon=rw override this default. The following xmon operations are affected: memops: disable memmove disable memset disable memzcan memex: no-op'd mwrite super_regs: no-op'd write_spr bpt_cmds: disable proc_call: disable Signed-off-by: Christopher M. Riedl <cmr@informatik.wtf> Reviewed-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
401 lines
12 KiB
Plaintext
401 lines
12 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config PPC_DISABLE_WERROR
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bool "Don't build arch/powerpc code with -Werror"
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help
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This option tells the compiler NOT to build the code under
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arch/powerpc with the -Werror flag (which means warnings
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are treated as errors).
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Only enable this if you are hitting a build failure in the
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arch/powerpc code caused by a warning, and you don't feel
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inclined to fix it.
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config PPC_WERROR
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bool
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depends on !PPC_DISABLE_WERROR
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default y
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config PRINT_STACK_DEPTH
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int "Stack depth to print" if DEBUG_KERNEL
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default 64
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help
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This option allows you to set the stack depth that the kernel
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prints in stack traces. This can be useful if your display is
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too small and stack traces cause important information to
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scroll off the screen.
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config HCALL_STATS
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bool "Hypervisor call instrumentation"
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depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
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help
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Adds code to keep track of the number of hypervisor calls made and
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the amount of time spent in hypervisor calls. Wall time spent in
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each call is always calculated, and if available CPU cycles spent
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are also calculated. A directory named hcall_inst is added at the
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root of the debugfs filesystem. Within the hcall_inst directory
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are files that contain CPU specific call statistics.
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This option will add a small amount of overhead to all hypervisor
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calls.
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config PPC_EMULATED_STATS
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bool "Emulated instructions tracking"
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depends on DEBUG_FS
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help
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Adds code to keep track of the number of instructions that are
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emulated by the in-kernel emulator. Counters for the various classes
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of emulated instructions are available under
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powerpc/emulated_instructions/ in the root of the debugfs file
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system. Optionally (controlled by
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powerpc/emulated_instructions/do_warn in debugfs), rate-limited
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warnings can be printed to the console when instructions are
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emulated.
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config CODE_PATCHING_SELFTEST
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bool "Run self-tests of the code-patching code"
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depends on DEBUG_KERNEL
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config JUMP_LABEL_FEATURE_CHECKS
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bool "Enable use of jump label for cpu/mmu_has_feature()"
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depends on JUMP_LABEL
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default y
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help
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Selecting this options enables use of jump labels for some internal
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feature checks. This should generate more optimal code for those
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checks.
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config JUMP_LABEL_FEATURE_CHECK_DEBUG
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bool "Do extra check on feature fixup calls"
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depends on DEBUG_KERNEL && JUMP_LABEL_FEATURE_CHECKS
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help
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This tries to catch incorrect usage of cpu_has_feature() and
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mmu_has_feature() in the code.
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If you don't know what this means, say N.
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config FTR_FIXUP_SELFTEST
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bool "Run self-tests of the feature-fixup code"
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depends on DEBUG_KERNEL
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config MSI_BITMAP_SELFTEST
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bool "Run self-tests of the MSI bitmap code"
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depends on DEBUG_KERNEL
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config PPC_IRQ_SOFT_MASK_DEBUG
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bool "Include extra checks for powerpc irq soft masking"
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config XMON
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bool "Include xmon kernel debugger"
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depends on DEBUG_KERNEL
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help
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Include in-kernel hooks for the xmon kernel monitor/debugger.
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Unless you are intending to debug the kernel, say N here.
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Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
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nothing will appear on the screen (xmon writes directly to the
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framebuffer memory).
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The cmdline option 'xmon' or 'xmon=early' will drop into xmon
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very early during boot. 'xmon=on' will just enable the xmon
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debugger hooks. 'xmon=off' will disable the debugger hooks
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if CONFIG_XMON_DEFAULT is set.
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xmon will print a backtrace on the very first invocation.
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'xmon=nobt' will disable this autobacktrace.
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config XMON_DEFAULT
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bool "Enable xmon by default"
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depends on XMON
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help
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xmon is normally disabled unless booted with 'xmon=on'.
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Use 'xmon=off' to disable xmon init during runtime.
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config XMON_DISASSEMBLY
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bool "Include disassembly support in xmon"
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depends on XMON
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default y
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help
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Include support for disassembling in xmon. You probably want
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to say Y here, unless you're building for a memory-constrained
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system.
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config XMON_DEFAULT_RO_MODE
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bool "Restrict xmon to read-only operations by default"
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depends on XMON
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default y
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help
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Operate xmon in read-only mode. The cmdline options 'xmon=rw' and
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'xmon=ro' override this default.
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config DEBUGGER
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bool
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depends on KGDB || XMON
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default y
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config BDI_SWITCH
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bool "Include BDI-2000 user context switcher"
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depends on DEBUG_KERNEL && PPC32
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help
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Include in-kernel support for the Abatron BDI2000 debugger.
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Unless you are intending to debug the kernel with one of these
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machines, say N here.
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config BOOTX_TEXT
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bool "Support for early boot text console (BootX or OpenFirmware only)"
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depends on PPC_BOOK3S
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help
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Say Y here to see progress messages from the boot firmware in text
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mode. Requires either BootX or Open Firmware.
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config PPC_EARLY_DEBUG
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bool "Early debugging (dangerous)"
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help
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Say Y to enable some early debugging facilities that may be available
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for your processor/board combination. Those facilities are hacks
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intended to debug problems early during boot, this should not be
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enabled in a production kernel.
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Note that enabling this will also cause the kernel default log level
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to be pushed to max automatically very early during boot
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choice
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prompt "Early debugging console"
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depends on PPC_EARLY_DEBUG
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help
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Use the selected console for early debugging. Careful, if you
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enable debugging for the wrong type of machine your kernel
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_will not boot_.
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config PPC_EARLY_DEBUG_BOOTX
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bool "BootX or OpenFirmware"
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depends on BOOTX_TEXT
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help
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Select this to enable early debugging for a machine using BootX
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or OpenFirmware.
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config PPC_EARLY_DEBUG_LPAR
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bool "LPAR HV Console"
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depends on PPC_PSERIES && HVC_CONSOLE
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help
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Select this to enable early debugging for a machine with a HVC
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console on vterm 0.
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config PPC_EARLY_DEBUG_LPAR_HVSI
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bool "LPAR HVSI Console"
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depends on PPC_PSERIES && HVC_CONSOLE
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help
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Select this to enable early debugging for a machine with a HVSI
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console on a specified vterm.
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config PPC_EARLY_DEBUG_G5
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bool "Apple G5"
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depends on PPC_PMAC64
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help
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Select this to enable early debugging for Apple G5 machines.
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config PPC_EARLY_DEBUG_RTAS_PANEL
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bool "RTAS Panel"
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depends on PPC_RTAS
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help
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Select this to enable early debugging via the RTAS panel.
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config PPC_EARLY_DEBUG_RTAS_CONSOLE
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bool "RTAS Console"
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depends on PPC_RTAS
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select UDBG_RTAS_CONSOLE
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help
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Select this to enable early debugging via the RTAS console.
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config PPC_EARLY_DEBUG_MAPLE
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bool "Maple real mode"
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depends on PPC_MAPLE
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help
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Select this to enable early debugging for Maple.
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config PPC_EARLY_DEBUG_PAS_REALMODE
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bool "PA Semi real mode"
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depends on PPC_PASEMI
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help
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Select this to enable early debugging for PA Semi.
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Output will be on UART0.
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config PPC_EARLY_DEBUG_44x
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bool "Early serial debugging for IBM/AMCC 44x CPUs"
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depends on 44x
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help
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Select this to enable early debugging for IBM 44x chips via the
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inbuilt serial port. If you enable this, ensure you set
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PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
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config PPC_EARLY_DEBUG_40x
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bool "Early serial debugging for IBM/AMCC 40x CPUs"
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depends on 40x
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help
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Select this to enable early debugging for IBM 40x chips via the
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inbuilt serial port. This works on chips with a 16550 compatible
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UART. Xilinx chips with uartlite cannot use this option.
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config PPC_EARLY_DEBUG_CPM
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bool "Early serial debugging for Freescale CPM-based serial ports"
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depends on SERIAL_CPM
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help
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Select this to enable early debugging for Freescale chips
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using a CPM-based serial port. This assumes that the bootwrapper
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has run, and set up the CPM in a particular way.
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config PPC_EARLY_DEBUG_USBGECKO
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bool "Early debugging through the USB Gecko adapter"
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depends on GAMECUBE_COMMON
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select USBGECKO_UDBG
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help
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Select this to enable early debugging for Nintendo GameCube/Wii
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consoles via an external USB Gecko adapter.
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config PPC_EARLY_DEBUG_PS3GELIC
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bool "Early debugging through the PS3 Ethernet port"
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depends on PPC_PS3
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select PS3GELIC_UDBG
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help
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Select this to enable early debugging for the PlayStation3 via
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UDP broadcasts sent out through the Ethernet port.
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config PPC_EARLY_DEBUG_OPAL_RAW
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bool "OPAL raw console"
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depends on HVC_OPAL
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help
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Select this to enable early debugging for the PowerNV platform
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using a "raw" console
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config PPC_EARLY_DEBUG_OPAL_HVSI
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bool "OPAL hvsi console"
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depends on HVC_OPAL
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help
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Select this to enable early debugging for the PowerNV platform
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using an "hvsi" console
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config PPC_EARLY_DEBUG_MEMCONS
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bool "In memory console"
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help
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Select this to enable early debugging using an in memory console.
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This console provides input and output buffers stored within the
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kernel BSS and should be safe to select on any system. A debugger
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can then be used to read kernel output or send input to the console.
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endchoice
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config PPC_MEMCONS_OUTPUT_SIZE
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int "In memory console output buffer size"
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depends on PPC_EARLY_DEBUG_MEMCONS
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default 4096
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help
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Selects the size of the output buffer (in bytes) of the in memory
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console.
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config PPC_MEMCONS_INPUT_SIZE
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int "In memory console input buffer size"
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depends on PPC_EARLY_DEBUG_MEMCONS
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default 128
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help
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Selects the size of the input buffer (in bytes) of the in memory
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console.
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config PPC_EARLY_DEBUG_OPAL
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def_bool y
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depends on PPC_EARLY_DEBUG_OPAL_RAW || PPC_EARLY_DEBUG_OPAL_HVSI
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config PPC_EARLY_DEBUG_HVSI_VTERMNO
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hex "vterm number to use with early debug HVSI"
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depends on PPC_EARLY_DEBUG_LPAR_HVSI
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default "0x30000000"
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help
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You probably want 0x30000000 for your first serial port and
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0x30000001 for your second one
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config PPC_EARLY_DEBUG_OPAL_VTERMNO
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hex "vterm number to use with OPAL early debug"
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depends on PPC_EARLY_DEBUG_OPAL
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default "0"
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help
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This correspond to which /dev/hvcN you want to use for early
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debug.
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On OPAL v2, this will be 0 for network console and 1 or 2 for
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the machine built-in serial ports.
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config PPC_EARLY_DEBUG_44x_PHYSLOW
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hex "Low 32 bits of early debug UART physical address"
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depends on PPC_EARLY_DEBUG_44x
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default "0x40000200"
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help
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You probably want 0x40000200 for ebony boards and
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0x40000300 for taishan
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config PPC_EARLY_DEBUG_44x_PHYSHIGH
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hex "EPRN of early debug UART physical address"
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depends on PPC_EARLY_DEBUG_44x
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default "0x1"
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config PPC_EARLY_DEBUG_40x_PHYSADDR
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hex "Early debug UART physical address"
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depends on PPC_EARLY_DEBUG_40x
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default "0xef600300"
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config PPC_EARLY_DEBUG_CPM_ADDR
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hex "CPM UART early debug transmit descriptor address"
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depends on PPC_EARLY_DEBUG_CPM
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default "0xfa202008" if PPC_EP88XC
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default "0xf0001ff8" if CPM2
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default "0xff002008" if CPM1
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help
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This specifies the address of the transmit descriptor
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used for early debug output. Because it is needed before
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platform probing is done, all platforms selected must
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share the same address.
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config FAIL_IOMMU
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bool "Fault-injection capability for IOMMU"
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depends on FAULT_INJECTION
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help
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Provide fault-injection capability for IOMMU. Each device can
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be selectively enabled via the fail_iommu property.
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If you are unsure, say N.
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config PPC_PTDUMP
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bool "Export kernel pagetable layout to userspace via debugfs"
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depends on DEBUG_KERNEL && DEBUG_FS
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help
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This option exports the state of the kernel pagetables to a
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debugfs file. This is only useful for kernel developers who are
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working in architecture specific areas of the kernel - probably
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not a good idea to enable this feature in a production kernel.
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If you are unsure, say N.
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config PPC_DEBUG_WX
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bool "Warn on W+X mappings at boot"
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depends on PPC_PTDUMP
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help
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Generate a warning if any W+X mappings are found at boot.
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This is useful for discovering cases where the kernel is leaving
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W+X mappings after applying NX, as such mappings are a security risk.
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Note that even if the check fails, your kernel is possibly
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still fine, as W+X mappings are not a security hole in
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themselves, what they do is that they make the exploitation
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of other unfixed kernel bugs easier.
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There is no runtime or memory usage effect of this option
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once the kernel has booted up - it's a one time check.
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If in doubt, say "Y".
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config PPC_FAST_ENDIAN_SWITCH
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bool "Deprecated fast endian-switch syscall"
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depends on DEBUG_KERNEL && PPC_BOOK3S_64
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help
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If you're unsure what this is, say N.
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config KASAN_SHADOW_OFFSET
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hex
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depends on KASAN
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default 0xe0000000
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