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2923 svoboda 1
/*
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup debug
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 * @{
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 */
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/** @file
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
3093 svoboda 38
#include <bool.h>
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#include <udebug.h>
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#include <kernel/arch/context_offset.h>
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2936 svoboda 43
#include "../../../cons.h"
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#include "../../../main.h"
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#include "../../../include/arch.h"
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#define OPCODE_INT3     0xCC
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void arch_dthread_initialize(dthread_t *dt)
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{
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    dt->arch.singlestep = false;
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}
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static int _set_trap_flag(dthread_t *dt, bool enable)
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{
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    static istate_t istate;
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    int rc;
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    rc = udebug_regs_read(app_phone, dt->hash, &istate);
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    if (rc < 0) { printf("regs read failed\n"); return -1; }
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    if (enable) istate.eflags |= 0x0100; /* trap flag */
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    else if (!active_bkpt) istate.eflags &= ~0x0100; /* trap flag */
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    rc = udebug_regs_write(app_phone, dt->hash, &istate);  
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    if (rc < 0) { printf("regs write failed\n"); return -1; }
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    return 0;
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}
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int arch_breakpoint_set(breakpoint_t *b)
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{
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    char brkp[1];
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    int rc;
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    rc = udebug_mem_read(app_phone, &b->arch.back, b->addr, 1);
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    cons_printf("udebug_mem_read() -> %d\n", rc);
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    if (rc < 0) return rc;
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    brkp[0] = OPCODE_INT3;
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    rc = udebug_mem_write(app_phone, brkp, b->addr, 1);
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    if (rc < 0) return rc;
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    cons_printf("udebug_mem_write() -> %d\n", rc);
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    return 0;
2923 svoboda 86
}
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int arch_breakpoint_remove(breakpoint_t *b)
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{
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    int rc;
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    if (b->active) {
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        active_bkpt = NULL;
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    } else {
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            rc = udebug_mem_write(app_phone, &b->arch.back, b->addr, 1);
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        if (rc < 0) {
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            cons_printf("error writing mem\n");
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            return rc;
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        }
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    }
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    return 0;
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}
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void arch_event_breakpoint(thash_t thread_hash)
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{
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    static istate_t istate;
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    breakpoint_t *b;
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    int rc;
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    rc = udebug_regs_read(app_phone, thread_hash, &istate);
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//  cons_printf("udebug_regs_read -> %d\n", rc);
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//  cons_printf("EIP was 0x%08x\n", istate.eip);
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    int brk_addr = istate.eip - 1;
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    b = breakpoint_find_by_addr(brk_addr);
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    if (!b) {
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        cons_printf("unrecognized breakpoint at 0x%x\n", brk_addr);
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        return;
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    }
2924 svoboda 121
 
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    istate.eip = brk_addr;
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    istate.eflags |= 0x0100; /* trap flag */
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    rc = udebug_regs_write(app_phone, thread_hash, &istate);
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    if (rc < 0) { cons_printf("error writing regs\n"); return; }
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        rc = udebug_mem_write(app_phone, &b->arch.back, brk_addr, 1);
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    if (rc < 0) { cons_printf("error writing mem\n"); return; }
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//      cons_printf("udebug_mem_write(phone, 0x%x, 0x%02x, 1) -> %d\n", brk_addr, brk_list[bi].arch.back, rc);
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    b->active = true;
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    active_bkpt = b;
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    breakpoint_hit(b);
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}
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void arch_event_trap(dthread_t *dt)
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{
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    breakpoint_t *b;
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    static istate_t istate;
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    unsigned char brkinstr[1];
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    int rc;
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//  cons_printf("trap event\n");
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    b = active_bkpt;
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    if (b) {
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        brkinstr[0] = OPCODE_INT3;
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        rc = udebug_mem_write(app_phone, brkinstr, b->addr, 1);
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//      cons_printf("restore breakpoint -> %d\n", rc);
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        active_bkpt = NULL;
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    }
2923 svoboda 153
 
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    rc = _set_trap_flag(dt, false);
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    dt->arch.singlestep = false;
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    singlestep_hit();
2923 svoboda 158
}
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2941 svoboda 160
void arch_dump_regs(thash_t thash)
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{
2942 svoboda 162
    static istate_t istate;
2941 svoboda 163
    int rc;
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    rc = udebug_regs_read(app_phone, thash, &istate);
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    if (rc < 0) { cons_printf("Error reading regs\n"); return; }
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168
    cons_printf(
4393 svoboda 169
        "eip:%08x eflags:%08x eax:%08x ecx:%08x edx:%08x\n"
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        "cs:%04x ds:%04x es:%04x fs:%04x gs:%04x\n",
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        istate.eip, istate.eflags, istate.eax,
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        istate.ecx, istate.edx, istate.cs,
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        istate.ds, istate.es, istate.fs, istate.gs);
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}
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3093 svoboda 176
void arch_singlestep(dthread_t *dt)
2942 svoboda 177
{
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    int rc;
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3093 svoboda 180
    rc = _set_trap_flag(dt, true);
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    if (rc != 0) return;
2942 svoboda 182
 
3093 svoboda 183
    dthread_resume(dt);
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}
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2923 svoboda 186
/** @}
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 */