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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [kernel/] [exec_domain.c] - Rev 1765
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#include <linux/personality.h> #include <linux/ptrace.h> #include <linux/sched.h> #include <linux/mm.h> static asmlinkage void no_lcall7(struct pt_regs * regs); static unsigned long ident_map[32] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 }; struct exec_domain default_exec_domain = { "Linux", /* name */ no_lcall7, /* lcall7 causes a seg fault. */ 0, 0xff, /* All personalities. */ ident_map, /* Identity map signals. */ ident_map, /* - both ways. */ NULL, /* No usage counter. */ NULL /* Nothing after this in the list. */ }; static struct exec_domain *exec_domains = &default_exec_domain; static asmlinkage void no_lcall7(struct pt_regs * regs) { /* * This may have been a static linked SVr4 binary, so we would have the * personality set incorrectly. Check to see whether SVr4 is available, * and use it, otherwise give the user a SEGV. */ if (current->exec_domain && current->exec_domain->use_count) (*current->exec_domain->use_count)--; current->personality = PER_SVR4; current->exec_domain = lookup_exec_domain(current->personality); if (current->exec_domain && current->exec_domain->use_count) (*current->exec_domain->use_count)++; if (current->exec_domain && current->exec_domain->handler && current->exec_domain->handler != no_lcall7) { current->exec_domain->handler(regs); return; } send_sig(SIGSEGV, current, 1); } struct exec_domain *lookup_exec_domain(unsigned long personality) { unsigned long pers = personality & PER_MASK; struct exec_domain *it; for (it=exec_domains; it; it=it->next) if (pers >= it->pers_low && pers <= it->pers_high) return it; /* Should never get this far. */ printk(KERN_ERR "No execution domain for personality 0x%02lx\n", pers); return NULL; } int register_exec_domain(struct exec_domain *it) { struct exec_domain *tmp; if (!it) return -EINVAL; if (it->next) return -EBUSY; for (tmp=exec_domains; tmp; tmp=tmp->next) if (tmp == it) return -EBUSY; it->next = exec_domains; exec_domains = it; return 0; } int unregister_exec_domain(struct exec_domain *it) { struct exec_domain ** tmp; tmp = &exec_domains; while (*tmp) { if (it == *tmp) { *tmp = it->next; it->next = NULL; return 0; } tmp = &(*tmp)->next; } return -EINVAL; } asmlinkage int sys_personality(unsigned long personality) { struct exec_domain *it; unsigned long old_personality; if (personality == 0xffffffff) return current->personality; it = lookup_exec_domain(personality); if (!it) return -EINVAL; old_personality = current->personality; if (current->exec_domain && current->exec_domain->use_count) (*current->exec_domain->use_count)--; current->personality = personality; current->exec_domain = it; if (current->exec_domain->use_count) (*current->exec_domain->use_count)++; return old_personality; }