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target/arm: Delay check for magic kernel page 

There's nothing magic about the exception that we generate in order
to execute the magic kernel page.  We can and should allow gdb to
set a breakpoint at this location.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-07-14 10:00:33 -10:00 committed by Richard Henderson
parent 77fc6f5e28
commit 3805c2eba8
1 changed files with 11 additions and 11 deletions
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22
target/arm/translate.c
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@ -11968,17 +11968,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
0);
num_insns++;
#ifdef CONFIG_USER_ONLY
/* Intercept jump to the magic kernel page. */
if (dc->pc >= 0xffff0000) {
/* We always get here via a jump, so know we are not in a
conditional execution block. */
gen_exception_internal(EXCP_KERNEL_TRAP);
dc->is_jmp = DISAS_NORETURN;
break;
}
#endif
if (unlikely(!QTAILQ_EMPTY(&cs->breakpoints))) {
CPUBreakpoint *bp;
QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
@ -12010,6 +11999,17 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
gen_io_start();
}
#ifdef CONFIG_USER_ONLY
/* Intercept jump to the magic kernel page. */
if (dc->pc >= 0xffff0000) {
/* We always get here via a jump, so know we are not in a
conditional execution block. */
gen_exception_internal(EXCP_KERNEL_TRAP);
dc->is_jmp = DISAS_NORETURN;
break;
}
#endif
if (dc->ss_active && !dc->pstate_ss) {
/* Singlestep state is Active-pending.
* If we're in this state at the start of a TB then either