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Code Editor : task_finder_map.c
#include <linux/list.h> #include <linux/jhash.h> #include "stp_helper_lock.h" // When handling mmap()/munmap()/mprotect() syscall tracing to notice // memory map changes, we need to cache syscall entry parameter values // for processing at syscall exit. // __stp_tf_map_lock protects the hash table. // Documentation/spinlocks.txt suggest we can be a bit more clever // if we guarantee that in interrupt context we only read, not write // the datastructures. We should never change the hash table or the // contents in interrupt context (which should only ever call // stap_find_map_map_info for getting stored info). So we might // want to look into that if this seems a bottleneck. static STP_DEFINE_RWLOCK(__stp_tf_map_lock); #define __STP_TF_HASH_BITS 4 #define __STP_TF_TABLE_SIZE (1 << __STP_TF_HASH_BITS) #ifndef TASK_FINDER_MAP_ENTRY_ITEMS #define TASK_FINDER_MAP_ENTRY_ITEMS 100 #endif struct __stp_tf_map_entry { /* private: */ struct hlist_node hlist; int usage; /* public: */ pid_t pid; long syscall_no; unsigned long arg0; unsigned long arg1; unsigned long arg2; }; static struct __stp_tf_map_entry __stp_tf_map_free_list_items[TASK_FINDER_MAP_ENTRY_ITEMS]; static struct hlist_head __stp_tf_map_free_list[1]; static struct hlist_head __stp_tf_map_table[__STP_TF_TABLE_SIZE]; // __stp_tf_map_initialize(): Initialize the free list. Grabs the // lock. static void __stp_tf_map_initialize(void) { int i; struct hlist_head *head = &__stp_tf_map_free_list[0]; unsigned long flags; stp_write_lock_irqsave(&__stp_tf_map_lock, flags); for (i = 0; i < TASK_FINDER_MAP_ENTRY_ITEMS; i++) { hlist_add_head(&__stp_tf_map_free_list_items[i].hlist, head); } stp_write_unlock_irqrestore(&__stp_tf_map_lock, flags); } // __stp_tf_map_get_free_entry(): Returns an entry from the free list // or NULL. The __stp_tf_map_lock must be write locked before calling this // function. static struct __stp_tf_map_entry * __stp_tf_map_get_free_entry(void) { struct hlist_head *head = &__stp_tf_map_free_list[0]; struct hlist_node *node; struct __stp_tf_map_entry *entry = NULL; if (hlist_empty(head)) return NULL; stap_hlist_for_each_entry(entry, node, head, hlist) { break; } if (entry != NULL) hlist_del(&entry->hlist); return entry; } // __stp_tf_map_put_free_entry(): Puts an entry back on the free // list. The __stp_tf_map_lock must be write locked before calling this // function. static void __stp_tf_map_put_free_entry(struct __stp_tf_map_entry *entry) { struct hlist_head *head = &__stp_tf_map_free_list[0]; hlist_add_head(&entry->hlist, head); } // __stp_tf_map_hash(): Compute the map hash. static inline u32 __stp_tf_map_hash(struct task_struct *tsk) { return (jhash_1word(tsk->pid, 0) & (__STP_TF_TABLE_SIZE - 1)); } // Get map_entry if the map is present in the map hash table. // Returns NULL if not present. Takes a read lock on __stp_tf_map_lock. static struct __stp_tf_map_entry * __stp_tf_get_map_entry(struct task_struct *tsk) { struct hlist_head *head; struct hlist_node *node; struct __stp_tf_map_entry *entry; unsigned long flags; stp_read_lock_irqsave(&__stp_tf_map_lock, flags); head = &__stp_tf_map_table[__stp_tf_map_hash(tsk)]; stap_hlist_for_each_entry(entry, node, head, hlist) { if (tsk->pid == entry->pid) { stp_read_unlock_irqrestore(&__stp_tf_map_lock, flags); return entry; } } stp_read_unlock_irqrestore(&__stp_tf_map_lock, flags); return NULL; } // Add the map info to the map hash table. Takes a write lock on // __stp_tf_map_lock. static int __stp_tf_add_map(struct task_struct *tsk, long syscall_no, unsigned long arg0, unsigned long arg1, unsigned long arg2) { struct hlist_head *head; struct hlist_node *node; struct __stp_tf_map_entry *entry; unsigned long flags; stp_write_lock_irqsave(&__stp_tf_map_lock, flags); head = &__stp_tf_map_table[__stp_tf_map_hash(tsk)]; stap_hlist_for_each_entry(entry, node, head, hlist) { // If we find an existing entry, just increment the // usage count. if (tsk->pid == entry->pid) { entry->usage++; stp_write_unlock_irqrestore(&__stp_tf_map_lock, flags); return 0; } } // Get an element from the free list. entry = __stp_tf_map_get_free_entry(); if (!entry) { stp_write_unlock_irqrestore(&__stp_tf_map_lock, flags); return -ENOMEM; } entry->usage = 1; entry->pid = tsk->pid; entry->syscall_no = syscall_no; entry->arg0 = arg0; entry->arg1 = arg1; entry->arg2 = arg2; hlist_add_head(&entry->hlist, head); stp_write_unlock_irqrestore(&__stp_tf_map_lock, flags); return 0; } // Remove the map entry from the map hash table. Takes a write lock on // __stp_tf_map_lock. static int __stp_tf_remove_map_entry(struct __stp_tf_map_entry *entry) { struct hlist_head *head; struct hlist_node *node; int found = 0; if (entry != NULL) { unsigned long flags; stp_write_lock_irqsave(&__stp_tf_map_lock, flags); // Decrement the usage count. entry->usage--; // If the entry is unused, put it back on the free // list. if (entry->usage == 0) { hlist_del(&entry->hlist); __stp_tf_map_put_free_entry(entry); } stp_write_unlock_irqrestore(&__stp_tf_map_lock, flags); } return 0; }
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