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qemu/target/i386/bpt_helper.c
Chetan Pant d9ff33ada7 x86 tcg cpus: Fix Lesser GPL version number 
There is no "version 2" of the "Lesser" General Public License.
It is either "GPL version 2.0" or "Lesser GPL version 2.1".
This patch replaces all occurrences of "Lesser GPL version 2" with
"Lesser GPL version 2.1" in comment section.

Signed-off-by: Chetan Pant <chetan4windows@gmail.com>
Message-Id: <20201023122801.19514-1-chetan4windows@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-11-15 16:41:42 +01:00

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/*
* i386 breakpoint helpers
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#ifndef CONFIG_USER_ONLY
static inline bool hw_local_breakpoint_enabled(unsigned long dr7, int index)
{
return (dr7 >> (index * 2)) & 1;
}
static inline bool hw_global_breakpoint_enabled(unsigned long dr7, int index)
{
return (dr7 >> (index * 2)) & 2;
}
static inline bool hw_breakpoint_enabled(unsigned long dr7, int index)
{
return hw_global_breakpoint_enabled(dr7, index) ||
hw_local_breakpoint_enabled(dr7, index);
}
static inline int hw_breakpoint_type(unsigned long dr7, int index)
{
return (dr7 >> (DR7_TYPE_SHIFT + (index * 4))) & 3;
}
static inline int hw_breakpoint_len(unsigned long dr7, int index)
{
int len = ((dr7 >> (DR7_LEN_SHIFT + (index * 4))) & 3);
return (len == 2) ? 8 : len + 1;
}
static int hw_breakpoint_insert(CPUX86State *env, int index)
{
CPUState *cs = env_cpu(env);
target_ulong dr7 = env->dr[7];
target_ulong drN = env->dr[index];
int err = 0;
switch (hw_breakpoint_type(dr7, index)) {
case DR7_TYPE_BP_INST:
if (hw_breakpoint_enabled(dr7, index)) {
err = cpu_breakpoint_insert(cs, drN, BP_CPU,
&env->cpu_breakpoint[index]);
}
break;
case DR7_TYPE_IO_RW:
/* Notice when we should enable calls to bpt_io. */
return hw_breakpoint_enabled(env->dr[7], index)
? HF_IOBPT_MASK : 0;
case DR7_TYPE_DATA_WR:
if (hw_breakpoint_enabled(dr7, index)) {
err = cpu_watchpoint_insert(cs, drN,
hw_breakpoint_len(dr7, index),
BP_CPU | BP_MEM_WRITE,
&env->cpu_watchpoint[index]);
}
break;
case DR7_TYPE_DATA_RW:
if (hw_breakpoint_enabled(dr7, index)) {
err = cpu_watchpoint_insert(cs, drN,
hw_breakpoint_len(dr7, index),
BP_CPU | BP_MEM_ACCESS,
&env->cpu_watchpoint[index]);
}
break;
}
if (err) {
env->cpu_breakpoint[index] = NULL;
}
return 0;
}
static void hw_breakpoint_remove(CPUX86State *env, int index)
{
CPUState *cs = env_cpu(env);
switch (hw_breakpoint_type(env->dr[7], index)) {
case DR7_TYPE_BP_INST:
if (env->cpu_breakpoint[index]) {
cpu_breakpoint_remove_by_ref(cs, env->cpu_breakpoint[index]);
env->cpu_breakpoint[index] = NULL;
}
break;
case DR7_TYPE_DATA_WR:
case DR7_TYPE_DATA_RW:
if (env->cpu_breakpoint[index]) {
cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[index]);
env->cpu_breakpoint[index] = NULL;
}
break;
case DR7_TYPE_IO_RW:
/* HF_IOBPT_MASK cleared elsewhere. */
break;
}
}
void cpu_x86_update_dr7(CPUX86State *env, uint32_t new_dr7)
{
target_ulong old_dr7 = env->dr[7];
int iobpt = 0;
int i;
new_dr7 |= DR7_FIXED_1;
/* If nothing is changing except the global/local enable bits,
then we can make the change more efficient. */
if (((old_dr7 ^ new_dr7) & ~0xff) == 0) {
/* Fold the global and local enable bits together into the
global fields, then xor to show which registers have
changed collective enable state. */
int mod = ((old_dr7 | old_dr7 * 2) ^ (new_dr7 | new_dr7 * 2)) & 0xff;
for (i = 0; i < DR7_MAX_BP; i++) {
if ((mod & (2 << i * 2)) && !hw_breakpoint_enabled(new_dr7, i)) {
hw_breakpoint_remove(env, i);
}
}
env->dr[7] = new_dr7;
for (i = 0; i < DR7_MAX_BP; i++) {
if (mod & (2 << i * 2) && hw_breakpoint_enabled(new_dr7, i)) {
iobpt |= hw_breakpoint_insert(env, i);
} else if (hw_breakpoint_type(new_dr7, i) == DR7_TYPE_IO_RW
&& hw_breakpoint_enabled(new_dr7, i)) {
iobpt |= HF_IOBPT_MASK;
}
}
} else {
for (i = 0; i < DR7_MAX_BP; i++) {
hw_breakpoint_remove(env, i);
}
env->dr[7] = new_dr7;
for (i = 0; i < DR7_MAX_BP; i++) {
iobpt |= hw_breakpoint_insert(env, i);
}
}
env->hflags = (env->hflags & ~HF_IOBPT_MASK) | iobpt;
}
static bool check_hw_breakpoints(CPUX86State *env, bool force_dr6_update)
{
target_ulong dr6;
int reg;
bool hit_enabled = false;
dr6 = env->dr[6] & ~0xf;
for (reg = 0; reg < DR7_MAX_BP; reg++) {
bool bp_match = false;
bool wp_match = false;
switch (hw_breakpoint_type(env->dr[7], reg)) {
case DR7_TYPE_BP_INST:
if (env->dr[reg] == env->eip) {
bp_match = true;
}
break;
case DR7_TYPE_DATA_WR:
case DR7_TYPE_DATA_RW:
if (env->cpu_watchpoint[reg] &&
env->cpu_watchpoint[reg]->flags & BP_WATCHPOINT_HIT) {
wp_match = true;
}
break;
case DR7_TYPE_IO_RW:
break;
}
if (bp_match || wp_match) {
dr6 |= 1 << reg;
if (hw_breakpoint_enabled(env->dr[7], reg)) {
hit_enabled = true;
}
}
}
if (hit_enabled || force_dr6_update) {
env->dr[6] = dr6;
}
return hit_enabled;
}
void breakpoint_handler(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
CPUBreakpoint *bp;
if (cs->watchpoint_hit) {
if (cs->watchpoint_hit->flags & BP_CPU) {
cs->watchpoint_hit = NULL;
if (check_hw_breakpoints(env, false)) {
raise_exception(env, EXCP01_DB);
} else {
cpu_loop_exit_noexc(cs);
}
}
} else {
QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
if (bp->pc == env->eip) {
if (bp->flags & BP_CPU) {
check_hw_breakpoints(env, true);
raise_exception(env, EXCP01_DB);
}
break;
}
}
}
}
#endif
void helper_single_step(CPUX86State *env)
{
#ifndef CONFIG_USER_ONLY
check_hw_breakpoints(env, true);
env->dr[6] |= DR6_BS;
#endif
raise_exception(env, EXCP01_DB);
}
void helper_rechecking_single_step(CPUX86State *env)
{
if ((env->eflags & TF_MASK) != 0) {
helper_single_step(env);
}
}
void helper_set_dr(CPUX86State *env, int reg, target_ulong t0)
{
#ifndef CONFIG_USER_ONLY
switch (reg) {
case 0: case 1: case 2: case 3:
if (hw_breakpoint_enabled(env->dr[7], reg)
&& hw_breakpoint_type(env->dr[7], reg) != DR7_TYPE_IO_RW) {
hw_breakpoint_remove(env, reg);
env->dr[reg] = t0;
hw_breakpoint_insert(env, reg);
} else {
env->dr[reg] = t0;
}
return;
case 4:
if (env->cr[4] & CR4_DE_MASK) {
break;
}
/* fallthru */
case 6:
env->dr[6] = t0 | DR6_FIXED_1;
return;
case 5:
if (env->cr[4] & CR4_DE_MASK) {
break;
}
/* fallthru */
case 7:
cpu_x86_update_dr7(env, t0);
return;
}
raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
#endif
}
target_ulong helper_get_dr(CPUX86State *env, int reg)
{
switch (reg) {
case 0: case 1: case 2: case 3: case 6: case 7:
return env->dr[reg];
case 4:
if (env->cr[4] & CR4_DE_MASK) {
break;
} else {
return env->dr[6];
}
case 5:
if (env->cr[4] & CR4_DE_MASK) {
break;
} else {
return env->dr[7];
}
}
raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
}
/* Check if Port I/O is trapped by a breakpoint. */
void helper_bpt_io(CPUX86State *env, uint32_t port,
uint32_t size, target_ulong next_eip)
{
#ifndef CONFIG_USER_ONLY
target_ulong dr7 = env->dr[7];
int i, hit = 0;
for (i = 0; i < DR7_MAX_BP; ++i) {
if (hw_breakpoint_type(dr7, i) == DR7_TYPE_IO_RW
&& hw_breakpoint_enabled(dr7, i)) {
int bpt_len = hw_breakpoint_len(dr7, i);
if (port + size - 1 >= env->dr[i]
&& port <= env->dr[i] + bpt_len - 1) {
hit |= 1 << i;
}
}
}
if (hit) {
env->dr[6] = (env->dr[6] & ~0xf) | hit;
env->eip = next_eip;
raise_exception(env, EXCP01_DB);
}
#endif
}
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