b82055aece
Any helper that always raises an exception or interrupt, or simply exits to the main loop, can be so marked. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210514151342.384376-35-richard.henderson@linaro.org>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* i386 breakpoint helpers
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "helper-tcg.h"
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void QEMU_NORETURN helper_single_step(CPUX86State *env)
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{
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#ifndef CONFIG_USER_ONLY
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check_hw_breakpoints(env, true);
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env->dr[6] |= DR6_BS;
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#endif
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raise_exception(env, EXCP01_DB);
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}
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void helper_rechecking_single_step(CPUX86State *env)
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{
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if ((env->eflags & TF_MASK) != 0) {
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helper_single_step(env);
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}
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}
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target_ulong helper_get_dr(CPUX86State *env, int reg)
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{
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switch (reg) {
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case 0: case 1: case 2: case 3: case 6: case 7:
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return env->dr[reg];
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case 4:
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if (env->cr[4] & CR4_DE_MASK) {
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break;
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} else {
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return env->dr[6];
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}
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case 5:
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if (env->cr[4] & CR4_DE_MASK) {
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break;
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} else {
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return env->dr[7];
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}
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}
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raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
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}
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