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trace: Split guest_mem_before

Browse source 
There is no point in encoding load/store within a bit of
the memory trace info operand.  Represent atomic operations
as a single read-modify-write tracepoint.  Use MemOpIdx
instead of inventing a form specifically for traces.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-07-26 13:21:38 -10:00
parent 37aff08726
commit 0583f775d2
7 changed files with 28 additions and 122 deletions
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12
accel/tcg/atomic_common.c.inc
View file

@ -17,10 +17,8 @@ static void atomic_trace_rmw_pre(CPUArchState *env, target_ulong addr,
MemOpIdx oi)
{
CPUState *cpu = env_cpu(env);
uint16_t info = trace_mem_get_info(oi, false);
trace_guest_mem_before_exec(cpu, addr, info);
trace_guest_mem_before_exec(cpu, addr, info | TRACE_MEM_ST);
trace_guest_rmw_before_exec(cpu, addr, oi);
}
static void atomic_trace_rmw_post(CPUArchState *env, target_ulong addr,
@ -33,9 +31,7 @@ static void atomic_trace_rmw_post(CPUArchState *env, target_ulong addr,
static void atomic_trace_ld_pre(CPUArchState *env, target_ulong addr,
MemOpIdx oi)
{
uint16_t info = trace_mem_get_info(oi, false);
trace_guest_mem_before_exec(env_cpu(env), addr, info);
trace_guest_ld_before_exec(env_cpu(env), addr, oi);
}
static void atomic_trace_ld_post(CPUArchState *env, target_ulong addr,
@ -47,9 +43,7 @@ static void atomic_trace_ld_post(CPUArchState *env, target_ulong addr,
static void atomic_trace_st_pre(CPUArchState *env, target_ulong addr,
MemOpIdx oi)
{
uint16_t info = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), addr, info);
trace_guest_st_before_exec(env_cpu(env), addr, oi);
}
static void atomic_trace_st_post(CPUArchState *env, target_ulong addr,

1
accel/tcg/atomic_template.h
View file

@ -19,7 +19,6 @@
*/
#include "qemu/plugin.h"
#include "trace/mem.h"
#if DATA_SIZE == 16
# define SUFFIX o

7
accel/tcg/cputlb.c
View file

@ -34,7 +34,6 @@
#include "qemu/atomic128.h"
#include "exec/translate-all.h"
#include "trace/trace-root.h"
#include "trace/mem.h"
#include "tb-hash.h"
#include "internal.h"
#ifdef CONFIG_PLUGIN
@ -2113,10 +2112,9 @@ static inline uint64_t cpu_load_helper(CPUArchState *env, abi_ptr addr,
MemOp op, FullLoadHelper *full_load)
{
MemOpIdx oi = make_memop_idx(op, mmu_idx);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint64_t ret;
trace_guest_mem_before_exec(env_cpu(env), addr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), addr, oi);
ret = full_load(env, addr, oi, retaddr);
@ -2550,9 +2548,8 @@ cpu_store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
int mmu_idx, uintptr_t retaddr, MemOp op)
{
MemOpIdx oi = make_memop_idx(op, mmu_idx);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), addr, meminfo);
trace_guest_st_before_exec(env_cpu(env), addr, oi);
store_helper(env, addr, val, oi, retaddr, op);

44
accel/tcg/user-exec.c
View file

@ -27,7 +27,7 @@
#include "exec/helper-proto.h"
#include "qemu/atomic128.h"
#include "trace/trace-root.h"
#include "trace/mem.h"
#include "internal.h"
#undef EAX
#undef ECX
@ -889,10 +889,9 @@ int cpu_signal_handler(int host_signum, void *pinfo,
uint32_t cpu_ldub_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_UB, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint32_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = ldub_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -906,10 +905,9 @@ int cpu_ldsb_data(CPUArchState *env, abi_ptr ptr)
uint32_t cpu_lduw_be_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_BEUW, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint32_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = lduw_be_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -923,10 +921,9 @@ int cpu_ldsw_be_data(CPUArchState *env, abi_ptr ptr)
uint32_t cpu_ldl_be_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_BEUL, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint32_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = ldl_be_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -935,10 +932,9 @@ uint32_t cpu_ldl_be_data(CPUArchState *env, abi_ptr ptr)
uint64_t cpu_ldq_be_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_BEQ, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint64_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = ldq_be_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -947,10 +943,9 @@ uint64_t cpu_ldq_be_data(CPUArchState *env, abi_ptr ptr)
uint32_t cpu_lduw_le_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_LEUW, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint32_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = lduw_le_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -964,10 +959,9 @@ int cpu_ldsw_le_data(CPUArchState *env, abi_ptr ptr)
uint32_t cpu_ldl_le_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_LEUL, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint32_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = ldl_le_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -976,10 +970,9 @@ uint32_t cpu_ldl_le_data(CPUArchState *env, abi_ptr ptr)
uint64_t cpu_ldq_le_data(CPUArchState *env, abi_ptr ptr)
{
MemOpIdx oi = make_memop_idx(MO_LEQ, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, false);
uint64_t ret;
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_ld_before_exec(env_cpu(env), ptr, oi);
ret = ldq_le_p(g2h(env_cpu(env), ptr));
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_R);
return ret;
@ -1073,9 +1066,8 @@ uint64_t cpu_ldq_le_data_ra(CPUArchState *env, abi_ptr ptr, uintptr_t retaddr)
void cpu_stb_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
{
MemOpIdx oi = make_memop_idx(MO_UB, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stb_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1083,9 +1075,8 @@ void cpu_stb_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
void cpu_stw_be_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
{
MemOpIdx oi = make_memop_idx(MO_BEUW, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stw_be_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1093,9 +1084,8 @@ void cpu_stw_be_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
void cpu_stl_be_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
{
MemOpIdx oi = make_memop_idx(MO_BEUL, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stl_be_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1103,9 +1093,8 @@ void cpu_stl_be_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
void cpu_stq_be_data(CPUArchState *env, abi_ptr ptr, uint64_t val)
{
MemOpIdx oi = make_memop_idx(MO_BEQ, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stq_be_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1113,9 +1102,8 @@ void cpu_stq_be_data(CPUArchState *env, abi_ptr ptr, uint64_t val)
void cpu_stw_le_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
{
MemOpIdx oi = make_memop_idx(MO_LEUW, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stw_le_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1123,9 +1111,8 @@ void cpu_stw_le_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
void cpu_stl_le_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
{
MemOpIdx oi = make_memop_idx(MO_LEUL, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stl_le_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}
@ -1133,9 +1120,8 @@ void cpu_stl_le_data(CPUArchState *env, abi_ptr ptr, uint32_t val)
void cpu_stq_le_data(CPUArchState *env, abi_ptr ptr, uint64_t val)
{
MemOpIdx oi = make_memop_idx(MO_LEQ, MMU_USER_IDX);
uint16_t meminfo = trace_mem_get_info(oi, true);
trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
trace_guest_st_before_exec(env_cpu(env), ptr, oi);
stq_le_p(g2h(env_cpu(env), ptr), val);
qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, oi, QEMU_PLUGIN_MEM_W);
}

17
tcg/tcg-op.c
View file

@ -28,7 +28,6 @@
#include "tcg/tcg-op.h"
#include "tcg/tcg-mo.h"
#include "trace-tcg.h"
#include "trace/mem.h"
#include "exec/plugin-gen.h"
/* Reduce the number of ifdefs below. This assumes that all uses of
@ -2869,13 +2868,11 @@ void tcg_gen_qemu_ld_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
{
MemOp orig_memop;
MemOpIdx oi;
uint16_t info;
tcg_gen_req_mo(TCG_MO_LD_LD | TCG_MO_ST_LD);
memop = tcg_canonicalize_memop(memop, 0, 0);
oi = make_memop_idx(memop, idx);
info = trace_mem_get_info(oi, 0);
trace_guest_mem_before_tcg(tcg_ctx->cpu, cpu_env, addr, info);
trace_guest_ld_before_tcg(tcg_ctx->cpu, cpu_env, addr, oi);
orig_memop = memop;
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
@ -2910,13 +2907,11 @@ void tcg_gen_qemu_st_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
{
TCGv_i32 swap = NULL;
MemOpIdx oi;
uint16_t info;
tcg_gen_req_mo(TCG_MO_LD_ST | TCG_MO_ST_ST);
memop = tcg_canonicalize_memop(memop, 0, 1);
oi = make_memop_idx(memop, idx);
info = trace_mem_get_info(oi, 1);
trace_guest_mem_before_tcg(tcg_ctx->cpu, cpu_env, addr, info);
trace_guest_st_before_tcg(tcg_ctx->cpu, cpu_env, addr, oi);
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
swap = tcg_temp_new_i32();
@ -2951,7 +2946,6 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
{
MemOp orig_memop;
MemOpIdx oi;
uint16_t info;
if (TCG_TARGET_REG_BITS == 32 && (memop & MO_SIZE) < MO_64) {
tcg_gen_qemu_ld_i32(TCGV_LOW(val), addr, idx, memop);
@ -2966,8 +2960,7 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
tcg_gen_req_mo(TCG_MO_LD_LD | TCG_MO_ST_LD);
memop = tcg_canonicalize_memop(memop, 1, 0);
oi = make_memop_idx(memop, idx);
info = trace_mem_get_info(oi, 0);
trace_guest_mem_before_tcg(tcg_ctx->cpu, cpu_env, addr, info);
trace_guest_ld_before_tcg(tcg_ctx->cpu, cpu_env, addr, oi);
orig_memop = memop;
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
@ -3006,7 +2999,6 @@ void tcg_gen_qemu_st_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
{
TCGv_i64 swap = NULL;
MemOpIdx oi;
uint16_t info;
if (TCG_TARGET_REG_BITS == 32 && (memop & MO_SIZE) < MO_64) {
tcg_gen_qemu_st_i32(TCGV_LOW(val), addr, idx, memop);
@ -3016,8 +3008,7 @@ void tcg_gen_qemu_st_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
tcg_gen_req_mo(TCG_MO_LD_ST | TCG_MO_ST_ST);
memop = tcg_canonicalize_memop(memop, 1, 1);
oi = make_memop_idx(memop, idx);
info = trace_mem_get_info(oi, 1);
trace_guest_mem_before_tcg(tcg_ctx->cpu, cpu_env, addr, info);
trace_guest_st_before_tcg(tcg_ctx->cpu, cpu_env, addr, oi);
if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
swap = tcg_temp_new_i64();

18
trace-events
View file

@ -120,26 +120,16 @@ vcpu guest_cpu_reset(void)
# tcg/tcg-op.c
# @vaddr: Access' virtual address.
# @info : Access' information (see below).
# @memopidx: Access' information (see below).
#
# Start virtual memory access (before any potential access violation).
#
# Does not include memory accesses performed by devices.
#
# Access information can be parsed as:
#
# struct mem_info {
# uint8_t size_shift : 4; /* interpreted as "1 << size_shift" bytes */
# bool sign_extend: 1; /* sign-extended */
# uint8_t endianness : 1; /* 0: little, 1: big */
# bool store : 1; /* whether it is a store operation */
# pad : 1;
# uint8_t mmuidx : 4; /* mmuidx (softmmu only) */
# };
#
# Mode: user, softmmu
# Targets: TCG(all)
vcpu tcg guest_mem_before(TCGv vaddr, uint16_t info) "info=%d", "vaddr=0x%016"PRIx64" info=%d"
vcpu tcg guest_ld_before(TCGv vaddr, uint32_t memopidx) "info=%d", "vaddr=0x%016"PRIx64" memopidx=0x%x"
vcpu tcg guest_st_before(TCGv vaddr, uint32_t memopidx) "info=%d", "vaddr=0x%016"PRIx64" memopidx=0x%x"
vcpu tcg guest_rmw_before(TCGv vaddr, uint32_t memopidx) "info=%d", "vaddr=0x%016"PRIx64" memopidx=0x%x"
# include/user/syscall-trace.h

51
trace/mem.h
View file

@ -1,51 +0,0 @@
/*
* 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 "exec/memopidx.h"
#define TRACE_MEM_SZ_SHIFT_MASK 0xf /* size shift mask */
#define TRACE_MEM_SE (1ULL << 4) /* sign extended (y/n) */
#define TRACE_MEM_BE (1ULL << 5) /* big endian (y/n) */
#define TRACE_MEM_ST (1ULL << 6) /* store (y/n) */
#define TRACE_MEM_MMU_SHIFT 8 /* mmu idx */
/**
* trace_mem_get_info:
*
* Return a value for the 'info' argument in guest memory access traces.
*/
static inline uint16_t trace_mem_get_info(MemOpIdx oi, bool store)
{
MemOp op = get_memop(oi);
uint32_t size_shift = op & MO_SIZE;
bool sign_extend = op & MO_SIGN;
bool big_endian = (op & MO_BSWAP) == MO_BE;
uint16_t res;
res = size_shift & TRACE_MEM_SZ_SHIFT_MASK;
if (sign_extend) {
res |= TRACE_MEM_SE;
}
if (big_endian) {
res |= TRACE_MEM_BE;
}
if (store) {
res |= TRACE_MEM_ST;
}
#ifdef CONFIG_SOFTMMU
res |= get_mmuidx(oi) << TRACE_MEM_MMU_SHIFT;
#endif
return res;
}
#endif /* TRACE__MEM_H */