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trace: [all] Add "guest_mem_before" event

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The event is described in "trace-events". Note that the "MO_AMASK" flag
is not traced, since it does not seem to affect the visible semantics of
instructions.

[s/inline inline/inline/ to fix clang build.
--Stefan]

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 146549350711.18437.726780393247474362.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2016-06-09 19:31:47 +02:00 • committed by Stefan Hajnoczi
parent 7c2550432a
commit dcdaadb6ea
6 changed files with 158 additions and 0 deletions
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46
trace/mem-internal.h Normal file
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/*
* Helper functions for guest memory tracing
*
* Copyright (C) 2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef TRACE__MEM_INTERNAL_H
#define TRACE__MEM_INTERNAL_H
static inline uint8_t trace_mem_get_info(TCGMemOp op, bool store)
{
uint8_t res = op;
bool be = (op & MO_BSWAP) == MO_BE;
/* remove untraced fields */
res &= (1ULL << 4) - 1;
/* make endianness absolute */
res &= ~MO_BSWAP;
if (be) {
res |= 1ULL << 3;
}
/* add fields */
if (store) {
res |= 1ULL << 4;
}
return res;
}
static inline uint8_t trace_mem_build_info(
TCGMemOp size, bool sign_extend, TCGMemOp endianness, bool store)
{
uint8_t res = 0;
res |= size;
res |= (sign_extend << 2);
if (endianness == MO_BE) {
res |= (1ULL << 3);
}
res |= (store << 4);
return res;
}
#endif /* TRACE__MEM_INTERNAL_H */

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trace/mem.h Normal file
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/*
* Helper functions for guest memory tracing
*
* Copyright (C) 2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef TRACE__MEM_H
#define TRACE__MEM_H
#include "tcg/tcg.h"
/**
* trace_mem_get_info:
*
* Return a value for the 'info' argument in guest memory access traces.
*/
static uint8_t trace_mem_get_info(TCGMemOp op, bool store);
/**
* trace_mem_build_info:
*
* Return a value for the 'info' argument in guest memory access traces.
*/
static uint8_t trace_mem_build_info(TCGMemOp size, bool sign_extend,
TCGMemOp endianness, bool store);
#include "trace/mem-internal.h"
#endif /* TRACE__MEM_H */