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https://github.com/Fishwaldo/linux-bl808.git
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9f0b4807a4
The userspace stacks mostly have a stack (and in the case of the syscall stub we can just set their stack pointer) that points to the location of the stub data page already. Rework the stubs to use the stack pointer to derive the start of the data page, rather than requiring it to be hard-coded. In the clone stub, also integrate the int3 into the stack remap, since we really must not use the stack while we remap it. This prepares for putting the stub at a variable location that's not part of the normal address space of the userspace processes running inside the UML machine. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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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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#define STUB_START 0x100000UL
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#define STUB_CODE STUB_START
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#define STUB_DATA (STUB_CODE + UM_KERN_PAGE_SIZE)
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#define STUB_END (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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