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c3d91812a2
Given that the compiler adds two function calls into each function, the current spacing is overkill. Drop it down to 16 bytes per function, which is still plenty. This saves some space in the trace buffer. Also move the calculation into a function, so it is common code. Add a check for gd->mon_len being unset, which breaks tracing. Signed-off-by: Simon Glass <sjg@chromium.org>
114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2012 The Chromium OS Authors.
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*/
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#ifndef __TRACE_H
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#define __TRACE_H
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/* this file is included from a tool so uses uint32_t instead of u32, etc. */
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enum {
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/*
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* This affects the granularity of our trace. We can bin function
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* entry points into groups on the basis that functions typically
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* have a minimum size, so entry points can't appear any closer
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* than this to each other.
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*
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* The value here assumes a minimum instruction size of 4 bytes,
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* or that instructions are 2 bytes but there are at least 2 of
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* them in every function. Given that each function needs a call to
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* __cyg_profile_func_enter() and __cyg_profile_func_exit() as well,
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* we cannot have functions smaller that 16 bytes.
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*
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* Increasing this value reduces the number of functions we can
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* resolve, but reduces the size of the uintptr_t array used for
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* our function list, which is the length of the code divided by
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* this value.
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*/
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FUNC_SITE_SIZE = 16, /* distance between function sites */
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TRACE_VERSION = 1,
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};
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enum trace_chunk_type {
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TRACE_CHUNK_FUNCS,
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TRACE_CHUNK_CALLS,
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};
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/* A trace record for a function, as written to the profile output file */
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struct trace_output_func {
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uint32_t offset; /* Function offset into code */
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uint32_t call_count; /* Number of times called */
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};
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/* A header at the start of the trace output buffer */
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struct trace_output_hdr {
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enum trace_chunk_type type; /* Record type */
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uint32_t version; /* Version (TRACE_VERSION) */
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uint32_t rec_count; /* Number of records */
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uint32_t spare; /* 0 */
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uint64_t text_base; /* Value of CONFIG_TEXT_BASE */
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uint64_t spare2; /* 0 */
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};
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/* Print statistics about traced function calls */
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void trace_print_stats(void);
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/**
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* Dump a list of functions and call counts into a buffer
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*
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* Each record in the buffer is a struct trace_func_stats. The 'needed'
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* parameter returns the number of bytes needed to complete the operation,
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* which may be more than buff_size if your buffer is too small.
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*
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* @param buff Buffer in which to place data, or NULL to count size
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* @param buff_size Size of buffer
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* @param needed Returns number of bytes used / needed
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* Return: 0 if ok, -1 on error (buffer exhausted)
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*/
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int trace_list_functions(void *buff, size_t buff_size, size_t *needed);
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/* Flags for ftrace_record */
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enum ftrace_flags {
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FUNCF_EXIT = 0UL << 30,
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FUNCF_ENTRY = 1UL << 30,
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/* two more values are available */
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FUNCF_TIMESTAMP_MASK = 0x3fffffff,
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};
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#define TRACE_CALL_TYPE(call) ((call)->flags & 0xc0000000UL)
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/* Information about a single function entry/exit */
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struct trace_call {
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uint32_t func; /* Function offset */
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uint32_t caller; /* Caller function offset */
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uint32_t flags; /* Flags and timestamp */
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};
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int trace_list_calls(void *buff, size_t buff_size, size_t *needed);
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/**
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* Turn function tracing on and off
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*
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* Don't enable trace if it has not been initialised.
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*
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* @param enabled 1 to enable trace, 0 to disable
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*/
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void trace_set_enabled(int enabled);
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int trace_early_init(void);
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/**
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* Init the trace system
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*
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* This should be called after relocation with a suitably large buffer
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* (typically as large as the U-Boot text area)
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*
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* @param buff Pointer to trace buffer
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* @param buff_size Size of trace buffer
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*/
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int trace_init(void *buff, size_t buff_size);
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#endif
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