nutools/lib/reptyr/arch/x86_common.h

60 lines
2.2 KiB
C

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