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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>
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#ifndef __UM_PTRACE_X86_64_H
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#define __UM_PTRACE_X86_64_H
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#include "linux/compiler.h"
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#include "asm/errno.h"
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#include "asm/host_ldt.h"
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#define signal_fault signal_fault_x86_64
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#define __FRAME_OFFSETS /* Needed to get the R* macros */
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#include "asm/ptrace-generic.h"
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#undef signal_fault
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#define HOST_AUDIT_ARCH AUDIT_ARCH_X86_64
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void signal_fault(struct pt_regs_subarch *regs, void *frame, char *where);
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#define FS_BASE (21 * sizeof(unsigned long))
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#define GS_BASE (22 * sizeof(unsigned long))
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#define DS (23 * sizeof(unsigned long))
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#define ES (24 * sizeof(unsigned long))
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#define FS (25 * sizeof(unsigned long))
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#define GS (26 * sizeof(unsigned long))
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#define PT_REGS_RBX(r) UPT_RBX(&(r)->regs)
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#define PT_REGS_RCX(r) UPT_RCX(&(r)->regs)
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#define PT_REGS_RDX(r) UPT_RDX(&(r)->regs)
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#define PT_REGS_RSI(r) UPT_RSI(&(r)->regs)
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#define PT_REGS_RDI(r) UPT_RDI(&(r)->regs)
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#define PT_REGS_RBP(r) UPT_RBP(&(r)->regs)
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#define PT_REGS_RAX(r) UPT_RAX(&(r)->regs)
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#define PT_REGS_R8(r) UPT_R8(&(r)->regs)
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#define PT_REGS_R9(r) UPT_R9(&(r)->regs)
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#define PT_REGS_R10(r) UPT_R10(&(r)->regs)
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#define PT_REGS_R11(r) UPT_R11(&(r)->regs)
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#define PT_REGS_R12(r) UPT_R12(&(r)->regs)
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#define PT_REGS_R13(r) UPT_R13(&(r)->regs)
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#define PT_REGS_R14(r) UPT_R14(&(r)->regs)
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#define PT_REGS_R15(r) UPT_R15(&(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_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_SS(r) UPT_SS(&(r)->regs)
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#define PT_REGS_CS(r) UPT_CS(&(r)->regs)
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#define PT_REGS_ORIG_RAX(r) UPT_ORIG_RAX(&(r)->regs)
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#define PT_REGS_RIP(r) UPT_IP(&(r)->regs)
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#define PT_REGS_RSP(r) UPT_SP(&(r)->regs)
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#define PT_REGS_EFLAGS(r) UPT_EFLAGS(&(r)->regs)
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/* XXX */
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#define user_mode(r) UPT_IS_USER(&(r)->regs)
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#define PT_REGS_ORIG_SYSCALL(r) PT_REGS_RAX(r)
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#define PT_REGS_SYSCALL_RET(r) PT_REGS_RAX(r)
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#define PT_FIX_EXEC_STACK(sp) do ; while(0)
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#define profile_pc(regs) PT_REGS_IP(regs)
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static inline 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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{
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return -ENOSYS;
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}
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static inline 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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{
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return -ENOSYS;
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}
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static inline void arch_switch_to_tt(struct task_struct *from,
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struct task_struct *to)
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{
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}
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static inline void arch_switch_to_skas(struct task_struct *from,
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struct task_struct *to)
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{
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}
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#endif
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