60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
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/*
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* Copyright (C) 2011 by Nelson Elhage
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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struct x86_personality {
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size_t orig_ax;
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size_t ax;
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};
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struct x86_personality x86_personality[];
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static inline struct x86_personality *x86_pers(struct ptrace_child *child) {
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return &x86_personality[child->personality];
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}
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static inline void arch_fixup_regs(struct ptrace_child *child) {
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struct x86_personality *x86pers = x86_pers(child);
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struct ptrace_personality *pers = personality(child);
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struct user *user = &child->user;
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#define ptr(user, off) ((unsigned long*)((void*)(user)+(off)))
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*ptr(user, pers->reg_ip) -= 2;
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*ptr(user, x86pers->ax) = *ptr(user, x86pers->orig_ax);
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}
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static inline int arch_set_syscall(struct ptrace_child *child,
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unsigned long sysno) {
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return ptrace_command(child, PTRACE_POKEUSER,
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x86_pers(child)->orig_ax,
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sysno);
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}
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static inline int arch_save_syscall(struct ptrace_child *child) {
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child->saved_syscall = *ptr(&child->user, x86_pers(child)->orig_ax);
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return 0;
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}
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static inline int arch_restore_syscall(struct ptrace_child *child) {
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return 0;
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}
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#undef ptr
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