/* * If the arch supports passing the variable contents of * function_trace_op as the third parameter back from the * mcount call, then the arch should define this as 1.
*/ #ifndef ARCH_SUPPORTS_FTRACE_OPS #define ARCH_SUPPORTS_FTRACE_OPS 0 #endif
#ifdef CONFIG_FUNCTION_TRACER /* * If the arch's mcount caller does not support all of ftrace's * features, then it must call an indirect function that * does. Or at least does enough to prevent any unwelcome side effects. * * Also define the function prototype that these architectures use * to call the ftrace_ops_list_func().
*/ #if !ARCH_SUPPORTS_FTRACE_OPS # define FTRACE_FORCE_LIST_FUNC 1 void arch_ftrace_ops_list_func(unsignedlong ip, unsignedlong parent_ip); #else # define FTRACE_FORCE_LIST_FUNC 0 void arch_ftrace_ops_list_func(unsignedlong ip, unsignedlong parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs); #endif externconststruct ftrace_ops ftrace_nop_ops; externconststruct ftrace_ops ftrace_list_ops; struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec); #endif/* CONFIG_FUNCTION_TRACER */
/* Main tracing buffer and events set up */ #ifdef CONFIG_TRACING void trace_init(void); void early_trace_init(void); #else staticinlinevoid trace_init(void) { } staticinlinevoid early_trace_init(void) { } #endif
/** * ftrace_regs - ftrace partial/optimal register set * * ftrace_regs represents a group of registers which is used at the * function entry and exit. There are three types of registers. * * - Registers for passing the parameters to callee, including the stack * pointer. (e.g. rcx, rdx, rdi, rsi, r8, r9 and rsp on x86_64) * - Registers for passing the return values to caller. * (e.g. rax and rdx on x86_64) * - Registers for hooking the function call and return including the * frame pointer (the frame pointer is architecture/config dependent) * (e.g. rip, rbp and rsp for x86_64) * * Also, architecture dependent fields can be used for internal process. * (e.g. orig_ax on x86_64) * * Basically, ftrace_regs stores the registers related to the context. * On function entry, registers for function parameters and hooking the * function call are stored, and on function exit, registers for function * return value and frame pointers are stored. * * And also, it dpends on the context that which registers are restored * from the ftrace_regs. * On the function entry, those registers will be restored except for * the stack pointer, so that user can change the function parameters * and instruction pointer (e.g. live patching.) * On the function exit, only registers which is used for return values * are restored. * * NOTE: user *must not* access regs directly, only do it via APIs, because * the member can be changed according to the architecture. * This is why the structure is empty here, so that nothing accesses * the ftrace_regs directly.
*/ struct ftrace_regs { /* Nothing to see here, use the accessor functions! */
};
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS /* * Architectures that define HAVE_DYNAMIC_FTRACE_WITH_ARGS must define their own * arch_ftrace_get_regs() where it only returns pt_regs *if* it is fully * populated. It should return NULL otherwise.
*/ staticinlinestruct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
{ return &arch_ftrace_regs(fregs)->regs;
}
/* * ftrace_regs_set_instruction_pointer() is to be defined by the architecture * if to allow setting of the instruction pointer from the ftrace_regs when * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching.
*/ #define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0) #endif/* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
static __always_inline struct pt_regs *
ftrace_partial_regs(struct ftrace_regs *fregs, struct pt_regs *regs)
{ /* * If CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS=y, ftrace_regs memory * layout is including pt_regs. So always returns that address. * Since arch_ftrace_get_regs() will check some members and may return * NULL, we can not use it.
*/ return &arch_ftrace_regs(fregs)->regs;
}
/* * Please define arch dependent pt_regs which compatible to the * perf_arch_fetch_caller_regs() but based on ftrace_regs. * This requires * - user_mode(_regs) returns false (always kernel mode). * - able to use the _regs for stack trace.
*/ #ifndef arch_ftrace_fill_perf_regs /* As same as perf_arch_fetch_caller_regs(), do nothing by default */ #define arch_ftrace_fill_perf_regs(fregs, _regs) do {} while (0) #endif
/* * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs.
*/ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs)
{ if (IS_ENABLED(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS)) returntrue;
/* * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are * set in the flags member. * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and * IPMODIFY are a kind of attribute flags which can be set only before * registering the ftrace_ops, and can not be modified while registered. * Changing those attribute flags after registering ftrace_ops will * cause unexpected results. * * ENABLED - set/unset when ftrace_ops is registered/unregistered * DYNAMIC - set when ftrace_ops is registered to denote dynamically * allocated ftrace_ops which need special care * SAVE_REGS - The ftrace_ops wants regs saved at each function called * and passed to the callback. If this flag is set, but the * architecture does not support passing regs * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the * ftrace_ops will fail to register, unless the next flag * is set. * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the * handler can handle an arch that does not save regs * (the handler tests if regs == NULL), then it can set * this flag instead. It will not fail registering the ftrace_ops * but, the regs field will be NULL if the arch does not support * passing regs to the handler. * Note, if this flag is set, the SAVE_REGS flag will automatically * get set upon registering the ftrace_ops, if the arch supports it. * RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure * that the call back needs recursion protection. If it does * not set this, then the ftrace infrastructure will assume * that the callback can handle recursion on its own. * STUB - The ftrace_ops is just a place holder. * INITIALIZED - The ftrace_ops has already been initialized (first use time * register_ftrace_function() is called, it will initialized the ops) * DELETED - The ops are being deleted, do not let them be registered again. * ADDING - The ops is in the process of being added. * REMOVING - The ops is in the process of being removed. * MODIFYING - The ops is in the process of changing its filter functions. * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. * The arch specific code sets this flag when it allocated a * trampoline. This lets the arch know that it can update the * trampoline in case the callback function changes. * The ftrace_ops trampoline can be set by the ftrace users, and * in such cases the arch must not modify it. Only the arch ftrace * core code should set this flag. * IPMODIFY - The ops can modify the IP register. This can only be set with * SAVE_REGS. If another ops with this flag set is already registered * for any of the functions that this ops will be registered for, then * this ops will fail to register or set_filter_ip. * PID - Is affected by set_ftrace_pid (allows filtering on those pids) * RCU - Set when the ops can only be called when RCU is watching. * TRACE_ARRAY - The ops->private points to a trace_array descriptor. * PERMANENT - Set when the ops is permanent and should not be affected by * ftrace_enabled. * DIRECT - Used by the direct ftrace_ops helper for direct functions * (internal ftrace only, should not be used by others) * SUBOP - Is controlled by another op in field managed. * GRAPH - Is a component of the fgraph_ops structure
*/ enum {
FTRACE_OPS_FL_ENABLED = BIT(0),
FTRACE_OPS_FL_DYNAMIC = BIT(1),
FTRACE_OPS_FL_SAVE_REGS = BIT(2),
FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3),
FTRACE_OPS_FL_RECURSION = BIT(4),
FTRACE_OPS_FL_STUB = BIT(5),
FTRACE_OPS_FL_INITIALIZED = BIT(6),
FTRACE_OPS_FL_DELETED = BIT(7),
FTRACE_OPS_FL_ADDING = BIT(8),
FTRACE_OPS_FL_REMOVING = BIT(9),
FTRACE_OPS_FL_MODIFYING = BIT(10),
FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11),
FTRACE_OPS_FL_IPMODIFY = BIT(12),
FTRACE_OPS_FL_PID = BIT(13),
FTRACE_OPS_FL_RCU = BIT(14),
FTRACE_OPS_FL_TRACE_ARRAY = BIT(15),
FTRACE_OPS_FL_PERMANENT = BIT(16),
FTRACE_OPS_FL_DIRECT = BIT(17),
FTRACE_OPS_FL_SUBOP = BIT(18),
FTRACE_OPS_FL_GRAPH = BIT(19),
};
/* * FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes * to a ftrace_ops. Note, the requests may fail. * * ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the DIRECT ops is being registered. * This is called with both direct_mutex and * ftrace_lock are locked. * * ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being registered. * This is called with direct_mutex locked. * * DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being unregistered. * This is called with direct_mutex locked.
*/ enum ftrace_ops_cmd {
FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF,
FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER,
FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER,
};
/* * For most ftrace_ops_cmd, * Returns: * 0 - Success. * Negative on failure. The return value is dependent on the * callback.
*/ typedefint (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
#ifdef CONFIG_DYNAMIC_FTRACE /* The hash used to know what functions callbacks trace */ struct ftrace_ops_hash { struct ftrace_hash __rcu *notrace_hash; struct ftrace_hash __rcu *filter_hash; struct mutex regex_lock;
};
/* * Note, ftrace_ops can be referenced outside of RCU protection, unless * the RCU flag is set. If ftrace_ops is allocated and not part of kernel * core data, the unregistering of it will perform a scheduling on all CPUs * to make sure that there are no more users. Depending on the load of the * system that may take a bit of time. * * Any private data added must also take care not to be freed and if private * data is added to a ftrace_ops that is in core code, the user of the * ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
*/ struct ftrace_ops {
ftrace_func_t func; struct ftrace_ops __rcu *next; unsignedlong flags; void *private;
ftrace_func_t saved_func; #ifdef CONFIG_DYNAMIC_FTRACE struct ftrace_ops_hash local_hash; struct ftrace_ops_hash *func_hash; struct ftrace_ops_hash old_hash; unsignedlong trampoline; unsignedlong trampoline_size; struct list_head list; struct list_head subop_list;
ftrace_ops_func_t ops_func; struct ftrace_ops *managed; #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS unsignedlong direct_call; #endif #endif
};
/* * Traverse the ftrace_ops_list, invoking all entries. The reason that we * can use rcu_dereference_raw_check() is that elements removed from this list * are simply leaked, so there is no need to interact with a grace-period * mechanism. The rcu_dereference_raw_check() calls are needed to handle * concurrent insertions into the ftrace_ops_list. * * Silly Alpha and silly pointer-speculation compiler optimizations!
*/ #define do_for_each_ftrace_op(op, list) \
op = rcu_dereference_raw_check(list); \ do
/* * Optimized for just a single item in the list (as that is the normal case).
*/ #define while_for_each_ftrace_op(op) \ while (likely(op = rcu_dereference_raw_check((op)->next)) && \
unlikely((op) != &ftrace_list_end))
/* * Type of the current tracing.
*/ enum ftrace_tracing_type_t {
FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
FTRACE_TYPE_RETURN, /* Hook the return of the function */
};
/* Current tracing type, default is FTRACE_TYPE_ENTER */ externenum ftrace_tracing_type_t ftrace_tracing_type;
/* * The ftrace_ops must be a static and should also * be read_mostly. These functions do modify read_mostly variables * so use them sparely. Never free an ftrace_op or modify the * next pointer after it has been registered. Even after unregistering * it, the next pointer may still be used internally.
*/ int register_ftrace_function(struct ftrace_ops *ops); int unregister_ftrace_function(struct ftrace_ops *ops);
/* * This must be implemented by the architecture. * It is the way the ftrace direct_ops helper, when called * via ftrace (because there's other callbacks besides the * direct call), can inform the architecture's trampoline that this * routine has a direct caller, and what the caller is. * * For example, in x86, it returns the direct caller * callback function via the regs->orig_ax parameter. * Then in the ftrace trampoline, if this is set, it makes * the return from the trampoline jump to the direct caller * instead of going back to the function it just traced.
*/ staticinlinevoid arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsignedlong addr) { } #endif/* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
#ifdef CONFIG_STACK_TRACER
int stack_trace_sysctl(conststruct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
/* DO NOT MODIFY THIS VARIABLE DIRECTLY! */
DECLARE_PER_CPU(int, disable_stack_tracer);
/** * stack_tracer_disable - temporarily disable the stack tracer * * There's a few locations (namely in RCU) where stack tracing * cannot be executed. This function is used to disable stack * tracing during those critical sections. * * This function must be called with preemption or interrupts * disabled and stack_tracer_enable() must be called shortly after * while preemption or interrupts are still disabled.
*/ staticinlinevoid stack_tracer_disable(void)
{ /* Preemption or interrupts must be disabled */ if (IS_ENABLED(CONFIG_DEBUG_PREEMPT))
WARN_ON_ONCE(!preempt_count() || !irqs_disabled());
this_cpu_inc(disable_stack_tracer);
}
/** * stack_tracer_enable - re-enable the stack tracer * * After stack_tracer_disable() is called, stack_tracer_enable() * must be called shortly afterward.
*/ staticinlinevoid stack_tracer_enable(void)
{ if (IS_ENABLED(CONFIG_DEBUG_PREEMPT))
WARN_ON_ONCE(!preempt_count() || !irqs_disabled());
this_cpu_dec(disable_stack_tracer);
} #else staticinlinevoid stack_tracer_disable(void) { } staticinlinevoid stack_tracer_enable(void) { } #endif
/* Arches can override ftrace_get_symaddr() to convert fentry_ip to symaddr. */ #ifndef ftrace_get_symaddr /** * ftrace_get_symaddr - return the symbol address from fentry_ip * @fentry_ip: the address of ftrace location * * Get the symbol address from @fentry_ip (fast path). If there is no fast * search path, this returns 0. * User may need to use kallsyms API to find the symbol address.
*/ #define ftrace_get_symaddr(fentry_ip) (0) #endif
/* * Archs can set this to point to a variable that holds the value that was * expected at the call site before calling ftrace_bug().
*/ externconstvoid *ftrace_expected;
/* * The dyn_ftrace record's flags field is split into two parts. * the first part which is '0-FTRACE_REF_MAX' is a counter of * the number of callbacks that have registered the function that * the dyn_ftrace descriptor represents. * * The second part is a mask: * ENABLED - the function is being traced * REGS - the record wants the function to save regs * REGS_EN - the function is set up to save regs. * IPMODIFY - the record allows for the IP address to be changed. * DISABLED - the record is not ready to be touched yet * DIRECT - there is a direct function to call * CALL_OPS - the record can use callsite-specific ops * CALL_OPS_EN - the function is set up to use callsite-specific ops * TOUCHED - A callback was added since boot up * MODIFIED - The function had IPMODIFY or DIRECT attached to it * * When a new ftrace_ops is registered and wants a function to save * pt_regs, the rec->flags REGS is set. When the function has been * set up to save regs, the REG_EN flag is set. Once a function * starts saving regs it will do so until all ftrace_ops are removed * from tracing that function.
*/ enum {
FTRACE_FL_ENABLED = (1UL << 31),
FTRACE_FL_REGS = (1UL << 30),
FTRACE_FL_REGS_EN = (1UL << 29),
FTRACE_FL_TRAMP = (1UL << 28),
FTRACE_FL_TRAMP_EN = (1UL << 27),
FTRACE_FL_IPMODIFY = (1UL << 26),
FTRACE_FL_DISABLED = (1UL << 25),
FTRACE_FL_DIRECT = (1UL << 24),
FTRACE_FL_DIRECT_EN = (1UL << 23),
FTRACE_FL_CALL_OPS = (1UL << 22),
FTRACE_FL_CALL_OPS_EN = (1UL << 21),
FTRACE_FL_TOUCHED = (1UL << 20),
FTRACE_FL_MODIFIED = (1UL << 19),
};
int ftrace_set_filter_ip(struct ftrace_ops *ops, unsignedlong ip, int remove, int reset); int ftrace_set_filter_ips(struct ftrace_ops *ops, unsignedlong *ips, unsignedint cnt, int remove, int reset); int ftrace_set_filter(struct ftrace_ops *ops, unsignedchar *buf, int len, int reset); int ftrace_set_notrace(struct ftrace_ops *ops, unsignedchar *buf, int len, int reset); void ftrace_set_global_filter(unsignedchar *buf, int len, int reset); void ftrace_set_global_notrace(unsignedchar *buf, int len, int reset); void ftrace_free_filter(struct ftrace_ops *ops); void ftrace_ops_set_global_filter(struct ftrace_ops *ops);
/* * The FTRACE_UPDATE_* enum is used to pass information back * from the ftrace_update_record() and ftrace_test_record() * functions. These are called by the code update routines * to find out what is to be done for a given function. * * IGNORE - The function is already what we want it to be * MAKE_CALL - Start tracing the function * MODIFY_CALL - Stop saving regs for the function * MAKE_NOP - Stop tracing the function
*/ enum {
FTRACE_UPDATE_IGNORE,
FTRACE_UPDATE_MAKE_CALL,
FTRACE_UPDATE_MODIFY_CALL,
FTRACE_UPDATE_MAKE_NOP,
};
/* * If an arch would like functions that are only traced * by the function graph tracer to jump directly to its own * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR * to be that address to jump to.
*/ #ifndef FTRACE_GRAPH_TRAMP_ADDR #define FTRACE_GRAPH_TRAMP_ADDR ((unsignedlong) 0) #endif
/** * ftrace_make_nop - convert code into nop * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should be calling * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a caller to @addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure.
*/ externint ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsignedlong addr);
/** * ftrace_need_init_nop - return whether nop call sites should be initialized * * Normally the compiler's -mnop-mcount generates suitable nops, so we don't * need to call ftrace_init_nop() if the code is built with that flag. * Architectures where this is not always the case may define their own * condition. * * Return must be: * 0 if ftrace_init_nop() should be called * Nonzero if ftrace_init_nop() should not be called
*/
/** * ftrace_init_nop - initialize a nop call site * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should contain the contents created by * the compiler * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure.
*/ #ifndef ftrace_init_nop staticinlineint ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec)
{ return ftrace_make_nop(mod, rec, MCOUNT_ADDR);
} #endif
/** * ftrace_make_call - convert a nop call site into a call to addr * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should call * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a nop * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure.
*/ externint ftrace_make_call(struct dyn_ftrace *rec, unsignedlong addr);
#ifdefined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) /** * ftrace_modify_call - convert from one addr to another (no nop) * @rec: the call site record (e.g. mcount/fentry) * @old_addr: the address expected to be currently called to * @addr: the address to change to * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * When using call ops, this is called when the associated ops change, even * when (addr == old_addr). * * The code segment at @rec->ip should be a caller to @old_addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure.
*/ externint ftrace_modify_call(struct dyn_ftrace *rec, unsignedlong old_addr, unsignedlong addr); #else /* Should never be called */ staticinlineint ftrace_modify_call(struct dyn_ftrace *rec, unsignedlong old_addr, unsignedlong addr)
{ return -EINVAL;
} #endif
/* * Again users of functions that have ftrace_ops may not * have them defined when ftrace is not enabled, but these * functions may still be called. Use a macro instead of inline.
*/ #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) #define ftrace_set_filter_ips(ops, ips, cnt, remove, reset) ({ -ENODEV; }) #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) #define ftrace_free_filter(ops) do { } while (0) #define ftrace_ops_set_global_filter(ops) do { } while (0)
/* * Ftrace disable/restore without lock. Some synchronization mechanism * must be used to prevent ftrace_enabled to be changed between * disable/restore.
*/ staticinlineint __ftrace_enabled_save(void)
{ #ifdef CONFIG_FUNCTION_TRACER int saved_ftrace_enabled = ftrace_enabled;
ftrace_enabled = 0; return saved_ftrace_enabled; #else return 0; #endif
}
/* All archs should have this, but we define it for consistency */ #ifndef ftrace_return_address0 # define ftrace_return_address0 __builtin_return_address(0) #endif
/* Archs may use other ways for ADDR1 and beyond */ #ifndef ftrace_return_address # ifdef CONFIG_FRAME_POINTER # define ftrace_return_address(n) __builtin_return_address(n) # else # define ftrace_return_address(n) 0UL # endif #endif
if (!in_lock_functions(addr)) return addr;
addr = CALLER_ADDR1; if (!in_lock_functions(addr)) return addr; return CALLER_ADDR2;
}
#ifdef CONFIG_TRACE_PREEMPT_TOGGLE externvoid trace_preempt_on(unsignedlong a0, unsignedlong a1); externvoid trace_preempt_off(unsignedlong a0, unsignedlong a1); #else /* * Use defines instead of static inlines because some arches will make code out * of the CALLER_ADDR, when we really want these to be a real nop.
*/ # define trace_preempt_on(a0, a1) do { } while (0) # define trace_preempt_off(a0, a1) do { } while (0) #endif
/* * Structure that defines an entry function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end.
*/ struct ftrace_graph_ent { unsignedlong func; /* Current function */ int depth;
} __packed;
/* * Structure that defines an entry function trace with retaddr. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end.
*/ struct fgraph_retaddr_ent { unsignedlong func; /* Current function */ int depth; unsignedlong retaddr; /* Return address */
} __packed;
/* * Structure that defines a return function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end.
*/ struct ftrace_graph_ret { unsignedlong func; /* Current function */ #ifdef CONFIG_FUNCTION_GRAPH_RETVAL unsignedlong retval; #endif int depth; /* Number of functions that overran the depth limit for current task */ unsignedint overrun;
} __packed;
struct fgraph_ops;
/* Type of the callback handlers for tracing function graph*/ typedefvoid (*trace_func_graph_ret_t)(struct ftrace_graph_ret *, struct fgraph_ops *, struct ftrace_regs *); /* return */ typedefint (*trace_func_graph_ent_t)(struct ftrace_graph_ent *, struct fgraph_ops *, struct ftrace_regs *); /* entry */
struct fgraph_ops {
trace_func_graph_ent_t entryfunc;
trace_func_graph_ret_t retfunc; struct ftrace_ops ops; /* for the hash lists */ void *private;
trace_func_graph_ent_t saved_func; int idx;
};
void *fgraph_reserve_data(int idx, int size_bytes); void *fgraph_retrieve_data(int idx, int *size_bytes); void *fgraph_retrieve_parent_data(int idx, int *size_bytes, int depth);
/* * Stack of return addresses for functions * of a thread. * Used in struct thread_info
*/ struct ftrace_ret_stack { unsignedlong ret; unsignedlong func; #ifdef HAVE_FUNCTION_GRAPH_FP_TEST unsignedlong fp; #endif unsignedlong *retp;
};
/* * Primary handler of a function return. * It relays on ftrace_return_to_handler. * Defined in entry_32/64.S
*/ externvoid return_to_handler(void);
/* * Sometimes we don't want to trace a function with the function * graph tracer but we want them to keep traced by the usual function * tracer if the function graph tracer is not configured.
*/ #define __notrace_funcgraph notrace
/** * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called * * ftrace_graph_stop() is called when a severe error is detected in * the function graph tracing. This function is called by the critical * paths of function graph to keep those paths from doing any more harm.
*/
DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph);
/* Define as macros as fgraph_ops may not be defined */ #define register_ftrace_graph(ops) ({ -1; }) #define unregister_ftrace_graph(ops) do { } while (0)
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