mirror of
https://github.com/torvalds/linux
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aa6758d486
Implement sys_[gs]et_thread_area and the corresponding ptrace operations for UML. This is the main chunk, additional parts follow. This implementation is now well tested and has run reliably for some time, and we've understood all the previously existing problems. Their implementation saves the new GDT content and then forwards the call to the host when appropriate, i.e. immediately when the target process is running or on context switch otherwise (i.e. on fork and on ptrace() calls). In SKAS mode, we must switch registers on each context switch (because SKAS does not switches tls_array together with current->mm). Also, added get_cpu() locking; this has been done for SKAS mode, since TT does not need it (it does not use smp_processor_id()). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __UM_PTRACE_I386_H
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#define __UM_PTRACE_I386_H
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#define HOST_AUDIT_ARCH AUDIT_ARCH_I386
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#include "linux/compiler.h"
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#include "sysdep/ptrace.h"
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#include "asm/ptrace-generic.h"
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#include "asm/host_ldt.h"
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#include "choose-mode.h"
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#define PT_REGS_EAX(r) UPT_EAX(&(r)->regs)
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#define PT_REGS_EBX(r) UPT_EBX(&(r)->regs)
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#define PT_REGS_ECX(r) UPT_ECX(&(r)->regs)
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#define PT_REGS_EDX(r) UPT_EDX(&(r)->regs)
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#define PT_REGS_ESI(r) UPT_ESI(&(r)->regs)
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#define PT_REGS_EDI(r) UPT_EDI(&(r)->regs)
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#define PT_REGS_EBP(r) UPT_EBP(&(r)->regs)
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#define PT_REGS_CS(r) UPT_CS(&(r)->regs)
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#define PT_REGS_SS(r) UPT_SS(&(r)->regs)
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#define PT_REGS_DS(r) UPT_DS(&(r)->regs)
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#define PT_REGS_ES(r) UPT_ES(&(r)->regs)
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#define PT_REGS_FS(r) UPT_FS(&(r)->regs)
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#define PT_REGS_GS(r) UPT_GS(&(r)->regs)
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#define PT_REGS_EFLAGS(r) UPT_EFLAGS(&(r)->regs)
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#define PT_REGS_ORIG_SYSCALL(r) PT_REGS_EAX(r)
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#define PT_REGS_SYSCALL_RET(r) PT_REGS_EAX(r)
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#define PT_FIX_EXEC_STACK(sp) do ; while(0)
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/* Cope with a conditional i386 definition. */
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#undef profile_pc
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#define profile_pc(regs) PT_REGS_IP(regs)
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#define user_mode(r) UPT_IS_USER(&(r)->regs)
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extern int ptrace_get_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc);
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extern int ptrace_set_thread_area(struct task_struct *child, int idx,
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struct user_desc __user *user_desc);
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extern int do_set_thread_area_skas(struct user_desc *info);
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extern int do_get_thread_area_skas(struct user_desc *info);
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extern int do_set_thread_area_tt(struct user_desc *info);
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extern int do_get_thread_area_tt(struct user_desc *info);
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extern int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to);
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extern int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to);
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static inline int do_get_thread_area(struct user_desc *info)
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{
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return CHOOSE_MODE_PROC(do_get_thread_area_tt, do_get_thread_area_skas, info);
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}
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static inline int do_set_thread_area(struct user_desc *info)
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{
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return CHOOSE_MODE_PROC(do_set_thread_area_tt, do_set_thread_area_skas, info);
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}
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struct task_struct;
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#endif
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