| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | config TRACE_IRQFLAGS_SUPPORT |
| 4 | def_bool y |
| 5 | |
| 6 | config SH_STANDARD_BIOS |
| 7 | bool "Use LinuxSH standard BIOS" |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 8 | help |
| 9 | Say Y here if your target has the gdb-sh-stub |
| 10 | package from www.m17n.org (or any conforming standard LinuxSH BIOS) |
| 11 | in FLASH or EPROM. The kernel will use standard BIOS calls during |
| 12 | boot for various housekeeping tasks (including calls to read and |
| 13 | write characters to a system console, get a MAC address from an |
| 14 | on-board Ethernet interface, and shut down the hardware). Note this |
| 15 | does not work with machines with an existing operating system in |
| 16 | mask ROM and no flash (WindowsCE machines fall in this category). |
| 17 | If unsure, say N. |
| 18 | |
| 19 | config STACK_DEBUG |
| 20 | bool "Check for stack overflows" |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 21 | depends on DEBUG_KERNEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 22 | help |
| 23 | This option will cause messages to be printed if free stack space |
| 24 | drops below a certain limit. Saying Y here will add overhead to |
| 25 | every function call and will therefore incur a major |
| 26 | performance hit. Most users should say N. |
| 27 | |
| 28 | config 4KSTACKS |
| 29 | bool "Use 4Kb for kernel stacks instead of 8Kb" |
| 30 | depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB |
| 31 | help |
| 32 | If you say Y here the kernel will use a 4Kb stacksize for the |
| 33 | kernel stack attached to each process/thread. This facilitates |
| 34 | running more threads on a system and also reduces the pressure |
| 35 | on the VM subsystem for higher order allocations. This option |
| 36 | will also use IRQ stacks to compensate for the reduced stackspace. |
| 37 | |
| 38 | config IRQSTACKS |
| 39 | bool "Use separate kernel stacks when processing interrupts" |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 40 | depends on DEBUG_KERNEL && BROKEN |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 41 | help |
| 42 | If you say Y here the kernel will use separate kernel stacks |
| 43 | for handling hard and soft interrupts. This can help avoid |
| 44 | overflowing the process kernel stacks. |
| 45 | |
| 46 | config DUMP_CODE |
| 47 | bool "Show disassembly of nearby code in register dumps" |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 48 | depends on DEBUG_KERNEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 49 | default y if DEBUG_BUGVERBOSE |
| 50 | default n |
| 51 | help |
| 52 | This prints out a code trace of the instructions leading up to |
| 53 | the faulting instruction as a debugging aid. As this does grow |
| 54 | the kernel in size a bit, most users will want to say N here. |
| 55 | |
| 56 | Those looking for more verbose debugging output should say Y. |
| 57 | |
| 58 | config DWARF_UNWINDER |
| 59 | bool "Enable the DWARF unwinder for stacktraces" |
| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 60 | depends on DEBUG_KERNEL |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 61 | select FRAME_POINTER |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 62 | default n |
| 63 | help |
| 64 | Enabling this option will make stacktraces more accurate, at |
| 65 | the cost of an increase in overall kernel size. |
| 66 | |
| 67 | config SH_NO_BSS_INIT |
| 68 | bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" |
| 69 | depends on DEBUG_KERNEL |
| 70 | default n |
| 71 | help |
| 72 | If running in painfully slow environments, such as an RTL |
| 73 | simulation or from remote memory via SHdebug, where the memory |
| 74 | can already be guaranteed to ber zeroed on boot, say Y. |
| 75 | |
| 76 | For all other cases, say N. If this option seems perplexing, or |
| 77 | you aren't sure, say N. |
| 78 | |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 79 | config MCOUNT |
| 80 | def_bool y |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 81 | depends on STACK_DEBUG || FUNCTION_TRACER |