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target-i386: Move breakpoint related functions to new file
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| /* | ||
| * 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 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 "cpu.h" | ||
| #include "exec/helper-proto.h" | ||
|
|
||
|
|
||
| void hw_breakpoint_insert(CPUX86State *env, int index) | ||
| { | ||
| CPUState *cs = CPU(x86_env_get_cpu(env)); | ||
| int type = 0, err = 0; | ||
|
|
||
| switch (hw_breakpoint_type(env->dr[7], index)) { | ||
| case DR7_TYPE_BP_INST: | ||
| if (hw_breakpoint_enabled(env->dr[7], index)) { | ||
| err = cpu_breakpoint_insert(cs, env->dr[index], BP_CPU, | ||
| &env->cpu_breakpoint[index]); | ||
| } | ||
| break; | ||
| case DR7_TYPE_DATA_WR: | ||
| type = BP_CPU | BP_MEM_WRITE; | ||
| break; | ||
| case DR7_TYPE_IO_RW: | ||
| /* No support for I/O watchpoints yet */ | ||
| break; | ||
| case DR7_TYPE_DATA_RW: | ||
| type = BP_CPU | BP_MEM_ACCESS; | ||
| break; | ||
| } | ||
|
|
||
| if (type != 0) { | ||
| err = cpu_watchpoint_insert(cs, env->dr[index], | ||
| hw_breakpoint_len(env->dr[7], index), | ||
| type, &env->cpu_watchpoint[index]); | ||
| } | ||
|
|
||
| if (err) { | ||
| env->cpu_breakpoint[index] = NULL; | ||
| } | ||
| } | ||
|
|
||
| void hw_breakpoint_remove(CPUX86State *env, int index) | ||
| { | ||
| CPUState *cs; | ||
|
|
||
| if (!env->cpu_breakpoint[index]) { | ||
| return; | ||
| } | ||
| cs = CPU(x86_env_get_cpu(env)); | ||
| switch (hw_breakpoint_type(env->dr[7], index)) { | ||
| case DR7_TYPE_BP_INST: | ||
| if (hw_breakpoint_enabled(env->dr[7], index)) { | ||
| cpu_breakpoint_remove_by_ref(cs, env->cpu_breakpoint[index]); | ||
| } | ||
| break; | ||
| case DR7_TYPE_DATA_WR: | ||
| case DR7_TYPE_DATA_RW: | ||
| cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[index]); | ||
| break; | ||
| case DR7_TYPE_IO_RW: | ||
| /* No support for I/O watchpoints yet */ | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| 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_resume_from_signal(cs, NULL); | ||
| } | ||
| } | ||
| } 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; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| 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_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0) | ||
| { | ||
| #ifndef CONFIG_USER_ONLY | ||
| int i; | ||
|
|
||
| if (reg < 4) { | ||
| hw_breakpoint_remove(env, reg); | ||
| env->dr[reg] = t0; | ||
| hw_breakpoint_insert(env, reg); | ||
| } else if (reg == 7) { | ||
| for (i = 0; i < DR7_MAX_BP; i++) { | ||
| hw_breakpoint_remove(env, i); | ||
| } | ||
| env->dr[7] = t0; | ||
| for (i = 0; i < DR7_MAX_BP; i++) { | ||
| hw_breakpoint_insert(env, i); | ||
| } | ||
| } else { | ||
| env->dr[reg] = t0; | ||
| } | ||
| #endif | ||
| } |
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