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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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33bbc30654
atomic_notifier_chain_register() and uml_postsetup() do call kernel code that rely on the "current" kernel macro and a valid task_struct resp. thread_info struct. Give those functions a valid stack by moving uml_postsetup() in the init_thread stack. This moves enables a panic() call in this early code to generate a valid stacktrace, instead of crashing. E.g. when an UML kernel is started with an initrd but too few physical memory the panic() call get's actually processed. Signed-off-by: Thomas Meyer <thomas@m3y3r.de> Signed-off-by: Richard Weinberger <richard@nod.at>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#ifndef __START_H__
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#define __START_H__
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#include <generated/asm-offsets.h>
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/*
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* Stolen from linux/const.h, which can't be directly included since
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* this is used in userspace code, which has no access to the kernel
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* headers. Changed to be suitable for adding casts to the start,
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* rather than "UL" to the end.
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*/
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/* Some constant macros are used in both assembler and
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* C code. Therefore we cannot annotate them always with
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* 'UL' and other type specifiers unilaterally. We
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* use the following macros to deal with this.
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*/
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#ifdef __ASSEMBLY__
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#define _UML_AC(X, Y) (Y)
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#else
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#define __UML_AC(X, Y) (X(Y))
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#define _UML_AC(X, Y) __UML_AC(X, Y)
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#endif
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#define STUB_START _UML_AC(, 0x100000)
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#define STUB_CODE _UML_AC((unsigned long), STUB_START)
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#define STUB_DATA _UML_AC((unsigned long), STUB_CODE + UM_KERN_PAGE_SIZE)
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#define STUB_END _UML_AC((unsigned long), STUB_DATA + UM_KERN_PAGE_SIZE)
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#ifndef __ASSEMBLY__
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#include <sysdep/ptrace.h>
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struct cpu_task {
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int pid;
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void *task;
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};
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extern struct cpu_task cpu_tasks[];
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extern unsigned long high_physmem;
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extern unsigned long uml_physmem;
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extern unsigned long uml_reserved;
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extern unsigned long end_vm;
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extern unsigned long start_vm;
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extern unsigned long long highmem;
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extern unsigned long brk_start;
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extern unsigned long host_task_size;
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extern int linux_main(int argc, char **argv);
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extern void uml_finishsetup(void);
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struct siginfo;
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extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);
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#endif
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#endif
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