diff options
Diffstat (limited to 'target-i386/bpt_helper.c')
| -rw-r--r-- | target-i386/bpt_helper.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c new file mode 100644 index 0000000000..c071c24782 --- /dev/null +++ b/target-i386/bpt_helper.c @@ -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; + } +} + +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_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 +} |