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target-i386: Use switch in check_hw_breakpoints()

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Replace an if statement using magic numbers for breakpoint type with a
more explicit switch statement. This is to aid readability.

Change the return type and force_dr6_update argument type to bool.

While at it, fix Coding Style issues (missing braces).

Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
liguang 2013-01-15 13:39:56 +08:00 committed by Andreas Färber
parent 1cc21a180b
commit e175bce587
3 changed files with 34 additions and 14 deletions
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2
target-i386/cpu.h
View File

@ -1043,7 +1043,7 @@ static inline int hw_breakpoint_len(unsigned long dr7, int index)
void hw_breakpoint_insert(CPUX86State *env, int index);
void hw_breakpoint_remove(CPUX86State *env, int index);
int check_hw_breakpoints(CPUX86State *env, int force_dr6_update);
bool check_hw_breakpoints(CPUX86State *env, bool force_dr6_update);
void breakpoint_handler(CPUX86State *env);
/* will be suppressed */

44
target-i386/helper.c
View File

@ -1017,26 +1017,45 @@ void hw_breakpoint_remove(CPUX86State *env, int index)
}
}
int check_hw_breakpoints(CPUX86State *env, int force_dr6_update)
bool check_hw_breakpoints(CPUX86State *env, bool force_dr6_update)
{
target_ulong dr6;
int reg, type;
int hit_enabled = 0;
int reg;
bool hit_enabled = false;
dr6 = env->dr[6] & ~0xf;
for (reg = 0; reg < DR7_MAX_BP; reg++) {
type = hw_breakpoint_type(env->dr[7], reg);
if ((type == 0 && env->dr[reg] == env->eip) ||
((type & 1) && env->cpu_watchpoint[reg] &&
(env->cpu_watchpoint[reg]->flags & BP_WATCHPOINT_HIT))) {
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 = 1;
hit_enabled = true;
}
}
}
if (hit_enabled || force_dr6_update)
if (hit_enabled || force_dr6_update) {
env->dr[6] = dr6;
}
return hit_enabled;
}
@ -1047,16 +1066,17 @@ void breakpoint_handler(CPUX86State *env)
if (env->watchpoint_hit) {
if (env->watchpoint_hit->flags & BP_CPU) {
env->watchpoint_hit = NULL;
if (check_hw_breakpoints(env, 0))
if (check_hw_breakpoints(env, false)) {
raise_exception(env, EXCP01_DB);
else
} else {
cpu_resume_from_signal(env, NULL);
}
}
} else {
QTAILQ_FOREACH(bp, &env->breakpoints, entry)
if (bp->pc == env->eip) {
if (bp->flags & BP_CPU) {
check_hw_breakpoints(env, 1);
check_hw_breakpoints(env, true);
raise_exception(env, EXCP01_DB);
}
break;

2
target-i386/misc_helper.c
View File

@ -110,7 +110,7 @@ void helper_into(CPUX86State *env, int next_eip_addend)
void helper_single_step(CPUX86State *env)
{
#ifndef CONFIG_USER_ONLY
check_hw_breakpoints(env, 1);
check_hw_breakpoints(env, true);
env->dr[6] |= DR6_BS;
#endif
raise_exception(env, EXCP01_DB);