trap_x86.c

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// SPDX-FileCopyrightText: 2015 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#if __i386__ || __x86_64__
static bool xnu_thread_get_gpr(RzDebug *dbg, xnu_thread_t *thread);
static xnu_thread_t *get_xnu_thread(RzDebug *dbg, int tid);
 
static bool xnu_x86_hwstep_enable64(RzDebug *dbg, bool enable) {
    RZ_REG_T *state;
    int ret;
    xnu_thread_t *th = get_xnu_thread(dbg, dbg->tid);
    ret = xnu_thread_get_gpr(dbg, th);
    if (!ret) {
        eprintf("error to get gpr registers in trace bit intel\n");
        return false;
    }
    state = (RZ_REG_T *)&th->gpr;
    if (state->tsh.flavor == x86_THREAD_STATE32) {
        state->uts.ts32.__eflags = (state->uts.ts32.__eflags &
                           ~0x100UL) |
            (enable ? 0x100UL : 0);
    } else if (state->tsh.flavor == x86_THREAD_STATE64) {
        state->uts.ts64.__rflags = (state->uts.ts64.__rflags &
                           ~0x100UL) |
            (enable ? 0x100UL : 0);
    } else {
        eprintf("Invalid bit size\n");
        return false;
    }
    if (!xnu_thread_set_gpr(dbg, th)) {
        eprintf("error xnu_thread_set_gpr in modify_trace_bit intel\n");
        return false;
    }
    return true;
}
 
static bool xnu_x86_hwstep_enable32(RzDebug *dbg, bool enable) {
    RZ_REG_T *state;
    xnu_thread_t *th = get_xnu_thread(dbg, dbg->tid);
    int ret = xnu_thread_get_gpr(dbg, th);
    if (!ret) {
        eprintf("error to get gpr registers in trace bit intel\n");
        return false;
    }
    state = (RZ_REG_T *)&th->gpr;
    if (state->tsh.flavor == x86_THREAD_STATE32) {
        state->uts.ts32.__eflags = (state->uts.ts32.__eflags &
                           ~0x100UL) |
            (enable ? 0x100UL : 0);
    } else {
        eprintf("Invalid bit size\n");
        return false;
    }
    if (!xnu_thread_set_gpr(dbg, th)) {
        eprintf("error xnu_thread_set_gpr in modify_trace_bit intel\n");
        return false;
    }
    return true;
}
 
bool xnu_native_hwstep_enable(RzDebug *dbg, bool enable) {
    if (dbg->bits == RZ_SYS_BITS_64)
        return xnu_x86_hwstep_enable64(dbg, enable);
    return xnu_x86_hwstep_enable32(dbg, enable);
}
#endif