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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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08932a1983
Get UML to use the generic bug support rather than arch specific one.
If I insert an artificial bug right before loading init, I get this:
Kernel panic - not syncing: Kernel mode signal 4
EIP: 0023:[<0819d501>] CPU: 0 Not tainted ESP: 002b:f7fd4fbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 00007870 ECX: 00000013 EDX: 00007870
ESI: 0000786d EDI: 00000011 EBP: f7fd4fd8 DS: 002b ES: 002b
08273bec: [<0806e814>] show_regs+0x104/0x106
08273c08: [<08058927>] panic_exit+0x2c/0x4b
08273c18: [<08080ee7>] notifier_call_chain+0x32/0x5b
08273c38: [<08080fbd>] __atomic_notifier_call_chain+0x30/0x32
08273c54: [<08080fee>] atomic_notifier_call_chain+0x2f/0x31
08273c70: [<08073b88>] panic+0x75/0x131
08273c94: [<080586c7>] relay_signal+0x87/0x95
08273cb0: [<0806b9ee>] sig_handler_common_skas+0x9e/0x120
08273cd8: [<08067738>] sig_handler+0x28/0x4f
08273cec: [<0806792e>] handle_signal+0x53/0x89
08273d0c: [<08069f60>] hard_handler+0x18/0x28
08273d1c: [<ffffe500>] transitions+0xf7d598b8/0xfffffff0
With this patch in place, this is how it looks:
BUG: failure at init/main.c:779/init_post()!
Kernel panic - not syncing: BUG!
EIP: 0023:[<081a65d1>] CPU: 0 Not tainted ESP: 002b:f7f0dfbc EFLAGS: 00000246
Not tainted
EAX: 00000000 EBX: 000069db ECX: 00000013 EDX: 000069db
ESI: 000069d8 EDI: 00000011 EBP: f7f0dfd8 DS: 002b ES: 002b
098efedc: [<0806e9a4>] show_regs+0x104/0x106
098efef8: [<080589c7>] panic_exit+0x2c/0x4b
098eff08: [<080818d7>] notifier_call_chain+0x32/0x5b
098eff28: [<080819ad>] __atomic_notifier_call_chain+0x30/0x32
098eff44: [<080819de>] atomic_notifier_call_chain+0x2f/0x31
098eff60: [<08073f28>] panic+0x75/0x131
098eff84: [<080541d5>] init_post+0xcd/0xe8
098eff9c: [<08048ad4>] kernel_init+0x8e/0x9a
098effb4: [<08066dee>] run_kernel_thread+0x41/0x53
098effe0: [<08058e75>] new_thread_handler+0x62/0x8b
098efffc: [<a55a5a5a>] 0xa55a5a5a
[ jdike - added BUG_TABLE to linker script ]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
101 lines
2.1 KiB
ArmAsm
101 lines
2.1 KiB
ArmAsm
#include <asm-generic/vmlinux.lds.h>
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.fini : { *(.fini) } =0x9090
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_etext = .;
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PROVIDE (etext = .);
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. = ALIGN(4096);
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_sdata = .;
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PROVIDE (sdata = .);
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RODATA
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.unprotected : { *(.unprotected) }
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. = ALIGN(4096);
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PROVIDE (_unprotected_end = .);
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. = ALIGN(4096);
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.note : { *(.note.*) }
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__start___ex_table = .;
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__ex_table : { *(__ex_table) }
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__stop___ex_table = .;
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BUG_TABLE
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__uml_setup_start = .;
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.uml.setup.init : { *(.uml.setup.init) }
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__uml_setup_end = .;
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__uml_help_start = .;
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.uml.help.init : { *(.uml.help.init) }
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__uml_help_end = .;
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__uml_postsetup_start = .;
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.uml.postsetup.init : { *(.uml.postsetup.init) }
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__uml_postsetup_end = .;
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__setup_start = .;
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.init.setup : { *(.init.setup) }
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__setup_end = .;
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. = ALIGN(32);
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__per_cpu_start = . ;
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.data.percpu : { *(.data.percpu) }
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__per_cpu_end = . ;
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__initcall_start = .;
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.initcall.init : {
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INITCALLS
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}
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__initcall_end = .;
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__con_initcall_start = .;
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.con_initcall.init : { *(.con_initcall.init) }
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__con_initcall_end = .;
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__uml_initcall_start = .;
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.uml.initcall.init : { *(.uml.initcall.init) }
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__uml_initcall_end = .;
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__init_end = .;
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SECURITY_INIT
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__exitcall_begin = .;
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.exitcall : { *(.exitcall.exit) }
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__exitcall_end = .;
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__uml_exitcall_begin = .;
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.uml.exitcall : { *(.uml.exitcall.exit) }
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__uml_exitcall_end = .;
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. = ALIGN(4);
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__alt_instructions = .;
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.altinstructions : { *(.altinstructions) }
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__alt_instructions_end = .;
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.altinstr_replacement : { *(.altinstr_replacement) }
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/* .exit.text is discard at runtime, not link time, to deal with references
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from .altinstructions and .eh_frame */
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.exit.text : { *(.exit.text) }
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.exit.data : { *(.exit.data) }
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__preinit_array_start = .;
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.preinit_array : { *(.preinit_array) }
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__preinit_array_end = .;
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__init_array_start = .;
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.init_array : { *(.init_array) }
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__init_array_end = .;
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__fini_array_start = .;
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.fini_array : { *(.fini_array) }
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__fini_array_end = .;
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. = ALIGN(4096);
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__initramfs_start = .;
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.init.ramfs : { *(.init.ramfs) }
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__initramfs_end = .;
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/* Sections to be discarded */
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/DISCARD/ : {
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*(.exitcall.exit)
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}
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