generic-all.c

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// SPDX-FileCopyrightText: 2022 GustavoLCR <gugulcr@gmail.com>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_debug.h>
 
static ut64 read_ptr(RzDebug *dbg, ut64 at) {
    ut8 buf[8];
    if (!dbg->iob.read_at(dbg->iob.io, at, buf, dbg->bits)) {
        return UT64_MAX;
    }
    return rz_read_ble(buf, dbg->analysis->big_endian, dbg->bits * 8);
}
 
static RzList *backtrace_generic(RZ_BORROW RZ_NONNULL RzDebug *dbg) {
    rz_return_val_if_fail(dbg, NULL);
    const size_t pointer_size = dbg->bits;
    RzList *ret = rz_list_newf(free);
    if (!ret) {
        return NULL;
    }
    ut64 lr = rz_reg_getv_by_role_or_name(dbg->reg, "LR");
    ut64 sp = rz_reg_getv_by_role_or_name(dbg->reg, "SP");
    ut64 bp = rz_reg_getv_by_role_or_name(dbg->reg, "BP");
    ut64 pc = rz_reg_getv_by_role_or_name(dbg->reg, "PC");
    RzDebugFrame *frame = RZ_NEW0(RzDebugFrame);
    if (!frame) {
        return ret;
    }
    frame->addr = pc;
    frame->bp = bp;
    frame->sp = sp;
    frame->size = bp - sp;
    sp = bp;
    bp = read_ptr(dbg, sp);
    sp += pointer_size;
    if (!lr || lr == UT64_MAX) {
        pc = read_ptr(dbg, sp);
        sp += pointer_size;
    } else {
        pc = lr;
    }
    rz_list_push(ret, frame);
 
    do {
        frame = RZ_NEW0(RzDebugFrame);
        if (!frame) {
            return ret;
        }
        frame->bp = bp;
        frame->sp = sp;
        frame->size = bp ? bp - sp : 0;
        frame->addr = pc;
        sp = bp;
        if (sp) {
            bp = read_ptr(dbg, sp);
            sp += pointer_size;
            pc = read_ptr(dbg, sp);
            sp += pointer_size;
        }
        rz_list_push(ret, frame);
    } while (sp && pc && pc != UT64_MAX);
 
    return ret;
}