#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <syscall.h>
#include <stddef.h>
#include <stdarg.h>
#include <ucontext.h>
#include <setjmp.h>
#include <sys/mman.h>
#include <pthread.h>
#ifndef ANDROID
#include <execinfo.h>
#endif

#include "x64_signals.h"
#include "os.h"
#include "backtrace.h"
#include "box64context.h"
#include "debug.h"
#include "x64emu.h"
#include "emu/x64emu_private.h"
#include "emu/x64run_private.h"
#include "signals.h"
#include "box64stack.h"
#include "box64cpu.h"
#include "callback.h"
#include "elfloader.h"
#include "threads.h"
#include "emu/x87emu_private.h"
#include "custommem.h"
#include "bridge.h"
#include "khash.h"
#include "x64trace.h"
#ifdef DYNAREC
#include "dynablock.h"
#include "../dynarec/dynablock_private.h"
#include "dynarec_native.h"
#include "dynarec/dynarec_arch.h"
#include "dynarec/dynarec_next.h"
#include "gdbjit.h"
#endif
#include "sigtools.h"

#include "signal_private.h"

static void sigstack_destroy(void* p)
{
    x64_stack_t *ss = (x64_stack_t*)p;
    box_free(ss);
}

static pthread_key_t sigstack_key;
static pthread_once_t sigstack_key_once = PTHREAD_ONCE_INIT;

static void sigstack_key_alloc() {
    pthread_key_create(&sigstack_key, sigstack_destroy);
}

x64_stack_t* sigstack_getstack() {
    return (x64_stack_t*)pthread_getspecific(sigstack_key);
}

#ifndef DYNAREC
dynablock_t* FindDynablockFromNativeAddress(void* addr) {return NULL;}
uintptr_t getX64Address(dynablock_t* db, uintptr_t pc) {return 0;}
#endif

// this allow handling "safe" function that just abort if accessing a bad address
static __thread JUMPBUFF signal_jmpbuf;
#ifdef ANDROID
#define SIG_JMPBUF signal_jmpbuf
#else
#define SIG_JMPBUF &signal_jmpbuf
#endif
static __thread int signal_jmpbuf_active = 0;

uint64_t RunFunctionHandler(x64emu_t* emu, int* exit, int dynarec, x64_ucontext_t* sigcontext, uintptr_t fnc, int nargs, ...)
{
    if(fnc==0 || fnc==1) {
        va_list va;
        va_start (va, nargs);
        int sig = va_arg(va, int);
        va_end (va);
        printf_log(LOG_NONE, "%04d|Warning, calling Signal %d function handler %s\n", GetTID(), sig, fnc?"SIG_IGN":"SIG_DFL");
        if(fnc==0) {
            printf_log(LOG_NONE, "Unhandled signal caught, aborting\n");
            abort();
        }
        return 0;
    }
#ifdef HAVE_TRACE
    uintptr_t old_start = trace_start, old_end = trace_end;
#if 0
    trace_start = 0; trace_end = 1; // disabling trace, globably for now...
#endif
#endif
    if(!emu)
        emu = thread_get_emu();
    #ifdef DYNAREC
    if (BOX64ENV(dynarec_test))
        emu->test.test = 0;
    #endif

    int align = nargs&1;

    if(nargs>6)
        R_RSP -= (nargs-6+align)*sizeof(void*);   // need to push in reverse order

    uint64_t *p = (uint64_t*)R_RSP;

    va_list va;
    va_start (va, nargs);
    for (int i=0; i<nargs; ++i) {
        if(i<6) {
            int nn[] = {_DI, _SI, _DX, _CX, _R8, _R9};
            emu->regs[nn[i]].q[0] = va_arg(va, uint64_t);
        } else {
            *p = va_arg(va, uint64_t);
            p++;
        }
    }
    va_end (va);

    printf_log(LOG_DEBUG, "%04d|signal #%d function handler %p called, RSP=%p%s\n", GetTID(), R_EDI, (void*)fnc, (void*)R_RSP, dynarec?" with Dynarec":"");

    int oldquitonlongjmp = emu->flags.quitonlongjmp;
    emu->flags.quitonlongjmp = 2;
    int old_cs = R_CS;
    R_CS = 0x33;

    if(dynarec)
        DynaCall(emu, fnc, 0);
    else
        EmuCall(emu, fnc);

    if(nargs>6 && !emu->flags.longjmp)
        R_RSP+=((nargs-6+align)*sizeof(void*));

    if(!emu->flags.longjmp && R_CS==0x33)
        R_CS = old_cs;

    emu->flags.quitonlongjmp = oldquitonlongjmp;

    #ifdef DYNAREC
    if (BOX64ENV(dynarec_test)) {
        emu->test.test = 0;
        emu->test.clean = 0;
    }
#endif

    if(emu->flags.longjmp) {
        // longjmp inside signal handler, lets grab all relevent value and do the actual longjmp in the signal handler
        emu->flags.longjmp = 0;
        if(sigcontext) {
            sigcontext->uc_mcontext.gregs[X64_R8] = R_R8;
            sigcontext->uc_mcontext.gregs[X64_R9] = R_R9;
            sigcontext->uc_mcontext.gregs[X64_R10] = R_R10;
            sigcontext->uc_mcontext.gregs[X64_R11] = R_R11;
            sigcontext->uc_mcontext.gregs[X64_R12] = R_R12;
            sigcontext->uc_mcontext.gregs[X64_R13] = R_R13;
            sigcontext->uc_mcontext.gregs[X64_R14] = R_R14;
            sigcontext->uc_mcontext.gregs[X64_R15] = R_R15;
            sigcontext->uc_mcontext.gregs[X64_RAX] = R_RAX;
            sigcontext->uc_mcontext.gregs[X64_RCX] = R_RCX;
            sigcontext->uc_mcontext.gregs[X64_RDX] = R_RDX;
            sigcontext->uc_mcontext.gregs[X64_RDI] = R_RDI;
            sigcontext->uc_mcontext.gregs[X64_RSI] = R_RSI;
            sigcontext->uc_mcontext.gregs[X64_RBP] = R_RBP;
            sigcontext->uc_mcontext.gregs[X64_RSP] = R_RSP;
            sigcontext->uc_mcontext.gregs[X64_RBX] = R_RBX;
            sigcontext->uc_mcontext.gregs[X64_RIP] = R_RIP;
            // flags
            sigcontext->uc_mcontext.gregs[X64_EFL] = emu->eflags.x64;
            // get segments
            sigcontext->uc_mcontext.gregs[X64_CSGSFS] = ((uint64_t)(R_CS)) | (((uint64_t)(R_GS))<<16) | (((uint64_t)(R_FS))<<32) | (((uint64_t)(R_SS))<<48) ;
        } else {
            printf_log(LOG_NONE, "Warning, longjmp in signal but no sigcontext to change\n");
        }
    }
    if(exit)
        *exit = emu->exit;

    uint64_t ret = R_RAX;

#ifdef HAVE_TRACE
    trace_start = old_start; trace_end = old_end;
#endif

    return ret;
}

EXPORT int my_sigaltstack(x64emu_t* emu, const x64_stack_t* ss, x64_stack_t* oss)
{
    if(!ss && !oss) {   // this is not true, ss can be NULL to retreive oss info only
        errno = EFAULT;
        return -1;
    }
    signal_jmpbuf_active = 1;
    if(sigsetjmp(SIG_JMPBUF, 1)) {
        // segfault while gathering function name...
        errno = EFAULT;
        return -1;
    }

    x64_stack_t *new_ss = (x64_stack_t*)pthread_getspecific(sigstack_key);
    if(oss) {
        if(!new_ss) {
            oss->ss_flags = SS_DISABLE;
            oss->ss_sp = emu->init_stack;
            oss->ss_size = emu->size_stack;
        } else {
            oss->ss_flags = new_ss->ss_flags;
            oss->ss_sp = new_ss->ss_sp;
            oss->ss_size = new_ss->ss_size;
        }
    }
    if(!ss) {
        signal_jmpbuf_active = 0;
        return 0;
    }
    printf_log(LOG_DEBUG, "%04d|sigaltstack called ss=%p[flags=0x%x, sp=%p, ss=0x%lx], oss=%p\n", GetTID(), ss, ss->ss_flags, ss->ss_sp, ss->ss_size, oss);
    if(ss->ss_flags && ss->ss_flags!=SS_DISABLE && ss->ss_flags!=SS_ONSTACK) {
        errno = EINVAL;
        signal_jmpbuf_active = 0;
        return -1;
    }

    if(ss->ss_flags==SS_DISABLE) {
        if(new_ss)
            box_free(new_ss);
        pthread_setspecific(sigstack_key, NULL);
        signal_jmpbuf_active = 0;
        return 0;
    }

    if(!new_ss)
        new_ss = (x64_stack_t*)box_calloc(1, sizeof(x64_stack_t));
    new_ss->ss_flags = 0;
    new_ss->ss_sp = ss->ss_sp;
    new_ss->ss_size = ss->ss_size;

    pthread_setspecific(sigstack_key, new_ss);
    signal_jmpbuf_active = 0;
    return 0;
}

#ifdef DYNAREC
x64emu_t* getEmuSignal(x64emu_t* emu, ucontext_t* p, dynablock_t* db)
{
    if(db && CONTEXT_REG(p, xEmu)>0x10000) {
        emu = (x64emu_t*)CONTEXT_REG(p, xEmu);
    }
    return emu;
}
#endif

void my_sigactionhandler_oldcode(x64emu_t* emu, int32_t sig, int simple, siginfo_t* info, void* ucntx, int* old_code, void* cur_db, uintptr_t x64pc);
#ifdef BOX32
int my_sigactionhandler_oldcode_32(x64emu_t* emu, int32_t sig, int simple, siginfo_t* info, void * ucntx, int* old_code, void* cur_db);
#endif

static int is_signal_deferrable(int sig)
{
    switch (sig) {
        case X64_SIGSEGV:
        case X64_SIGBUS:
        case X64_SIGILL:
        case X64_SIGABRT:
            return 0;
    }
    return 1;
}

int defer_signal(x64emu_t* emu, int signum, siginfo_t* info)
{
    if (!emu || signum < 0 || signum > MAX_SIGNAL || !is_signal_deferrable(signum) || emu->critical_section <= 0)
        return 0;

    if (info)
        emu->deferred_siginfo[signum] = *info;
    else
        memset(&emu->deferred_siginfo[signum], 0, sizeof(emu->deferred_siginfo[signum]));
    emu->deferred_siginfo[signum].si_signo = signum;
    if (!emu->deferred_signal_pending[signum])
        ++emu->deferred_signal_count;
    emu->deferred_signal_pending[signum] = 1;
    return 1;
}

void cancel_deferred_signal_processing(x64emu_t* emu)
{
    if (!emu) return;
    emu->critical_section = 0;
    emu->deferred_signal_processing = 0;
}

void enter_critical_section()
{
    x64emu_t* emu = thread_get_emu_no_create();
    if (emu) ++emu->critical_section;
}

void leave_critical_section()
{
    x64emu_t* emu = thread_get_emu_no_create();
    if (!emu || emu->critical_section <= 0)
        return;
    if (--emu->critical_section || !emu->deferred_signal_count || emu->deferred_signal_processing)
        return;

    emu->deferred_signal_processing = 1;
    while (emu->deferred_signal_count) {
        int handled = 0;
        for (int sig = 1; sig <= MAX_SIGNAL; ++sig) {
            if (!emu->deferred_signal_pending[sig])
                continue;
            siginfo_t info = emu->deferred_siginfo[sig];
            emu->deferred_signal_pending[sig] = 0;
            --emu->deferred_signal_count;
            handled = 1;
            my_sigactionhandler_oldcode(emu, sig, 0, &info, NULL, NULL, NULL, R_RIP);
        }
        if (!handled) {
            emu->deferred_signal_count = 0;
            break;
        }
    }
    emu->deferred_signal_processing = 0;
}

int my_sigactionhandler_oldcode_64(x64emu_t* emu, int32_t sig, int simple, siginfo_t* info, void * ucntx, int* old_code, void* cur_db)
{
    int Locks = unlockMutex();
    int log_minimum = (BOX64ENV(showsegv))?LOG_NONE:LOG_DEBUG;

    printf_log(LOG_DEBUG, "Sigactionhanlder for signal #%d called (jump to %p/%s)\n", sig, (void*)my_context->signals[sig], GetNativeName((void*)my_context->signals[sig], 1));

    uintptr_t restorer = my_context->restorer[sig];
    // get that actual ESP first!
    if(!emu)
        emu = thread_get_emu();
    uintptr_t frame = R_RSP;
#if defined(DYNAREC)
    dynablock_t* db = (dynablock_t*)cur_db;//FindDynablockFromNativeAddress(pc);
    ucontext_t *p = (ucontext_t *)ucntx;
    void* pc = NULL;
    if(p) {
        pc = (void*)CONTEXT_PC(p);
        if(db)
            frame = (uintptr_t)CONTEXT_REG(p, xRSP);    //this should not be needed, as emu has been "adjusted" to dynablock value already in the caller
    }
#else
    (void)ucntx; (void)cur_db;
    void* pc = NULL;
#endif

    // stack tracking
    x64_stack_t *new_ss = my_context->onstack[sig]?(x64_stack_t*)pthread_getspecific(sigstack_key):NULL;
    int used_stack = 0;
    if(new_ss && (new_ss->ss_flags!=SS_ONSTACK)) {  // alt stack and not already using it
        frame = (uintptr_t)(((uintptr_t)new_ss->ss_sp + new_ss->ss_size - 16ULL) & ~0x0fULL);
        used_stack = 1;
        new_ss->ss_flags = SS_ONSTACK;
    } else {
        frame = frame&~15ULL;
        frame -= 0x200ULL; // redzone
    }

    // TODO: do I need to really setup 2 stack frame? That doesn't seems right!
    // setup stack frame
    frame -= 512+64+16*16;
    void* xstate = (void*)frame;
    frame -= sizeof(siginfo_t);
    siginfo_t* info2 = (siginfo_t*)frame;
    memcpy(info2, info, sizeof(siginfo_t));
    // try to fill some sigcontext....
    frame -= sizeof(x64_ucontext_t);
    x64_ucontext_t   *sigcontext = (x64_ucontext_t*)frame;
    // get general register
    emu2mctx(&sigcontext->uc_mcontext, emu);
    // get FloatPoint status
    sigcontext->uc_mcontext.fpregs = xstate;//(struct x64_libc_fpstate*)&sigcontext->xstate;
    fpu_xsave_mask(emu, xstate, 0, 0b111);
    memcpy(&sigcontext->xstate, xstate, sizeof(sigcontext->xstate));
    ((struct x64_fpstate*)xstate)->res[12] = 0x46505853;   // magic number to signal an XSTATE type of fpregs
    ((struct x64_fpstate*)xstate)->res[13] = 0; // offset to xstate after this?
    // get signal mask

    if(new_ss) {
        sigcontext->uc_stack.ss_sp = new_ss->ss_sp;
        sigcontext->uc_stack.ss_size = new_ss->ss_size;
        sigcontext->uc_stack.ss_flags = new_ss->ss_flags;
    } else
        sigcontext->uc_stack.ss_flags = SS_DISABLE;
    // Try to guess some X64_TRAPNO
    /*
    TRAP_x86_DIVIDE     = 0,   // Division by zero exception
    TRAP_x86_TRCTRAP    = 1,   // Single-step exception
    TRAP_x86_NMI        = 2,   // NMI interrupt
    TRAP_x86_BPTFLT     = 3,   // Breakpoint exception
    TRAP_x86_OFLOW      = 4,   // Overflow exception
    TRAP_x86_BOUND      = 5,   // Bound range exception
    TRAP_x86_PRIVINFLT  = 6,   // Invalid opcode exception
    TRAP_x86_DNA        = 7,   // Device not available exception
    TRAP_x86_DOUBLEFLT  = 8,   // Double fault exception
    TRAP_x86_FPOPFLT    = 9,   // Coprocessor segment overrun
    TRAP_x86_TSSFLT     = 10,  // Invalid TSS exception
    TRAP_x86_SEGNPFLT   = 11,  // Segment not present exception
    TRAP_x86_STKFLT     = 12,  // Stack fault
    TRAP_x86_PROTFLT    = 13,  // General protection fault
    TRAP_x86_PAGEFLT    = 14,  // Page fault
    TRAP_x86_ARITHTRAP  = 16,  // Floating point exception
    TRAP_x86_ALIGNFLT   = 17,  // Alignment check exception
    TRAP_x86_MCHK       = 18,  // Machine check exception
    TRAP_x86_CACHEFLT   = 19   // SIMD exception (via SIGFPE) if CPU is SSE capable otherwise Cache flush exception (via SIGSEV)
    */
    uint32_t prot = getProtection((uintptr_t)info->si_addr);
    uint32_t mmapped = memExist((uintptr_t)info->si_addr);
    uint32_t sysmapped = (info->si_addr<(void*)box64_pagesize)?1:mmapped;
    uint32_t real_prot = 0;
    int skip = 3;   // in case sigjump is used to restore exectuion, 1 will switch to interpreter, 3 will switch to dynarec
    if(prot&PROT_READ) real_prot|=PROT_READ;
    if(prot&PROT_WRITE) real_prot|=PROT_WRITE;
    if(prot&PROT_EXEC) real_prot|=PROT_WRITE;
    if(prot&PROT_DYNAREC) real_prot|=PROT_WRITE;
    sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
    sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 0;
    if(sig==X64_SIGBUS)
        sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 17;
    else if(sig==X64_SIGSEGV) {
        if((uintptr_t)info->si_addr == sigcontext->uc_mcontext.gregs[X64_RIP]) {
            if(info->si_errno==0xbad0) {
                //bad opcode
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 13;
                info2->si_code = 128;
                info2->si_errno = 0;
                info2->si_addr = NULL;
            } else if (info->si_errno==0xecec) {
                // no excute bit on segment
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0x14|((sysmapped && !(real_prot&PROT_READ))?0:1);
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 14;
                if(!mmapped) info2->si_code = 1;
                info2->si_errno = 0;
            } else if (info->si_errno==0xb09d) {
                // bound exception
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 5;
                info2->si_errno = 0;
            }else {
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0x14|((sysmapped && !(real_prot&PROT_READ))?0:1);
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 14;
            }
        } else {
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 14;
            sigcontext->uc_mcontext.gregs[X64_ERR] = 4|((sysmapped && !(real_prot&PROT_READ))?0:1);
            if(write_opcode(sigcontext->uc_mcontext.gregs[X64_RIP], (uintptr_t)pc, (R_CS==0x23)))
                sigcontext->uc_mcontext.gregs[X64_ERR] |= 2;
        }
        if(info->si_code == SEGV_ACCERR && old_code)
            *old_code = -1;
        if(info->si_errno==0x1234) {
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 13;
            info2->si_errno = 0;
        } else if(info->si_errno==0xdead) {
            // INT x
            uint8_t int_n = info->si_code;
            info2->si_errno = 0;
            info2->si_code = 128;
            info2->si_addr = NULL;
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 13;
            skip = 3;   // can resume in dynarec
            // some special cases...
            if(int_n==3) {
                info2->si_signo = X64_SIGTRAP;
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 3;
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
            } else if(int_n==0x04) {
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 4;
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
            } else if (int_n==0x29 || int_n==0x2c || int_n==0x2d) {
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0x02|(int_n<<3);
            } else {
                sigcontext->uc_mcontext.gregs[X64_ERR] = 0x0a|(int_n<<3);
                sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 13;
            }
        } else if(info->si_errno==0xcafe) { // divide by 0
            info2->si_errno = 0;
            sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 0;
            info2->si_signo = X64_SIGFPE;
            skip = 3; // can resume in dynarec
        }
    } else if(sig==X64_SIGFPE) {
        if (info->si_code == FPE_INTOVF)
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 4;
        else
            sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 19;
        skip = 3;
    } else if(sig==X64_SIGILL) {
        info2->si_code = 2;
        sigcontext->uc_mcontext.gregs[X64_TRAPNO] = 6;
        info2->si_addr = (void*)sigcontext->uc_mcontext.gregs[X64_RIP];
    } else if(sig==X64_SIGTRAP) {
        if(info->si_code==1) {  //single step
            info2->si_code = 2;
            info2->si_addr = (void*)sigcontext->uc_mcontext.gregs[X64_RIP];
        } else
            info2->si_code = 128;
        sigcontext->uc_mcontext.gregs[X64_TRAPNO] = info->si_code;
        sigcontext->uc_mcontext.gregs[X64_ERR] = 0;
    } else {
        skip = 3;   // other signal can resume in dynarec
    }
    //TODO: SIGABRT generate what?
    printf_log((sig==10)?LOG_DEBUG:log_minimum, "Signal %d: si_addr=%p, TRAPNO=%d, ERR=%d, RIP=%p, prot=%x, mmapped:%d\n", sig, (void*)info2->si_addr, sigcontext->uc_mcontext.gregs[X64_TRAPNO], sigcontext->uc_mcontext.gregs[X64_ERR],sigcontext->uc_mcontext.gregs[X64_RIP], prot, mmapped);
    #ifdef DYNAREC
    if(sig==3)
        SerializeAllMapping();  // Signal Interupt: it's a good time to serialize the mappings if needed
    #endif
    // call the signal handler
    x64_ucontext_t sigcontext_copy = *sigcontext;
    // save old value from emu
    #define GO(A) uint64_t old_##A = R_##A
    GO(RAX);
    GO(RDI);
    GO(RSI);
    GO(RDX);
    GO(RCX);
    GO(R8);
    GO(R9);
    GO(RBP);
    #undef GO
    uint64_t old_eflags = emu->eflags.x64;
    emu->eflags.x64 = 0x202; // default flags for inside the signal handler
    // set stack pointer
    R_RSP = frame;
    // set frame pointer
    R_RBP = sigcontext->uc_mcontext.gregs[X64_RBP];

    int exits = 0;
    int ret;
    int dynarec = 0;
    #ifdef DYNAREC
    if(!(/*sig==X64_SIGSEGV ||*/ (Locks&is_dyndump_locked) || (Locks&is_memprot_locked)))
        dynarec = BOX64ENV(dynarec_interp_signal)?0:1;
    #endif
    ret = RunFunctionHandler(emu, &exits, dynarec, sigcontext, my_context->signals[info2->si_signo], 3, info2->si_signo, info2, sigcontext);
    if(used_stack)  // release stack
        new_ss->ss_flags = 0;
    // restore old value from emu
    #define GO(A) R_##A = old_##A
    GO(RAX);
    GO(RDI);
    GO(RSI);
    GO(RDX);
    GO(RCX);
    GO(R8);
    GO(R9);
    GO(RBP);
    #undef GO
    emu->eflags.x64 = old_eflags;

    if(memcmp(sigcontext, &sigcontext_copy, sizeof(x64_ucontext_t))) {
        #if defined(DYNAREC)
        if(db || emu->jmpbuf)
            mctx2emu(emu, &sigcontext->uc_mcontext);
        if(db && !ACCESS_FLAG(F_TF)) {
            // if signal was inside a dynablock, just mirror all the new regs in the right place to simple run native_next
            mctx2emu(emu, &sigcontext->uc_mcontext);
            copyEmu2USignalCTXreg(p, emu, native_next);
            printf_log((sig==10)?LOG_DEBUG:log_minimum, "Context has been changed in Sigactionhanlder, jumping to native_next from DynaBlock at %p, RSP=%p\n", (void*)R_RIP, (void*)R_RSP);
            return 1;
        }
        #endif
        if(emu->jmpbuf) {
            #ifndef DYNAREC
            mctx2emu(emu, &sigcontext->uc_mcontext);
            #endif
            if(ACCESS_FLAG(F_TF))
                skip = 1;   // no_tf may not be consumed in dynarec, force to use interpreter
            else if((skip==1) && (emu->ip.q[0]!=sigcontext->uc_mcontext.gregs[X64_RIP]))
                skip = 3;   // if it jumps elsewhere, it can resume with dynarec...
            if (ACCESS_FLAG(F_TF) && skip == 1) emu->flags.no_tf = 1;
            printf_log((sig==10)?LOG_DEBUG:log_minimum, "Context has been changed in Sigactionhanlder, doing siglongjmp to resume emu at %p, RSP=%p (resume with %s)\n", (void*)R_RIP, (void*)R_RSP, (skip==3)?"Dynarec":"Interp");
            if(old_code)
                *old_code = -1;    // re-init the value to allow another segfault at the same place
            //relockMutex(Locks);   // do not relock mutex, because of the siglongjmp, whatever was running is canceled
            #ifdef DYNAREC
            if(Locks & is_dyndump_locked)
                CancelBlock64(1);
            #endif
            #if defined(RV64) || defined(PPC64LE)
            emu->xSPSave = emu->old_savedsp;
            #endif
            #ifdef DYNAREC
            dynablock_leave_runtime((dynablock_t*)cur_db);
            #endif
            cancel_deferred_signal_processing(emu);
            #ifdef ANDROID
            siglongjmp(*emu->jmpbuf, skip);
            #else
            siglongjmp(emu->jmpbuf, skip);
            #endif
        }
        printf_log(LOG_INFO, "Warning, context has been changed in Sigactionhanlder%s\n", (sigcontext->uc_mcontext.gregs[X64_RIP]!=sigcontext_copy.uc_mcontext.gregs[X64_RIP])?" (EIP changed)":"");
    }
    // restore regs...
    #define GO(R)   R_##R=sigcontext->uc_mcontext.gregs[X64_##R]
    GO(RAX);
    GO(RCX);
    GO(RDX);
    GO(RDI);
    GO(RSI);
    GO(RBP);
    GO(RSP);
    GO(RBX);
    GO(R8);
    GO(R9);
    GO(R10);
    GO(R11);
    GO(R12);
    GO(R13);
    GO(R14);
    GO(R15);
    GO(RIP);
    #undef GO
    emu->eflags.x64=sigcontext->uc_mcontext.gregs[X64_EFL];
    if (ACCESS_FLAG(F_TF)) emu->flags.no_tf = 1;
    uint16_t seg;
    seg = (sigcontext->uc_mcontext.gregs[X64_CSGSFS] >> 0)&0xffff;
    #define GO(S) emu->segs[_##S]=seg;
    GO(CS);
    seg = (sigcontext->uc_mcontext.gregs[X64_CSGSFS] >> 16)&0xffff;
    GO(GS);
    seg = (sigcontext->uc_mcontext.gregs[X64_CSGSFS] >> 32)&0xffff;
    GO(FS);
    seg = (sigcontext->uc_mcontext.gregs[X64_CSGSFS] >> 48)&0xffff;
    GO(SS);
    #undef GO

    printf_log(LOG_DEBUG, "Sigactionhanlder main function returned (exit=%d, restorer=%p)\n", exits, (void*)restorer);
    if(exits) {
        //relockMutex(Locks);   // the thread will exit, so no relock there
        #ifdef DYNAREC
        if(Locks & is_dyndump_locked)
            CancelBlock64(1);
        #endif
        exit(ret);
    }
    if(restorer)
        RunFunctionHandler(emu, &exits, 0, NULL, restorer, 0);
    relockMutex(Locks);
    return 0;
}

void my_sigactionhandler_oldcode(x64emu_t* emu, int32_t sig, int simple, siginfo_t* info, void * ucntx, int* old_code, void* cur_db, uintptr_t x64pc)
{
    #define GO(A) uintptr_t old_##A = R_##A;
    GO(RAX);
    GO(RBX);
    GO(RCX);
    GO(RDX);
    GO(RBP);
    GO(RSP);
    GO(RDI);
    GO(RSI);
    GO(R8);
    GO(R9);
    GO(R10);
    GO(R11);
    GO(R12);
    GO(R13);
    GO(R14);
    GO(R15);
    GO(RIP);
    #undef GO
    x64flags_t old_eflags;
    deferred_flags_t old_df;
    multiuint_t old_op1;
    multiuint_t old_op2;
    multiuint_t old_res;
    sse_regs_t old_xmm[16];
    sse_regs_t old_ymm[16];
    mmx87_regs_t old_mmx[8];
    mmx87_regs_t old_x87[8];
    uint32_t old_top = emu->top;
    uint16_t old_segs[6];
    uintptr_t old_segs_offs[6];
    memcpy(old_xmm, emu->xmm, sizeof(old_xmm));
    memcpy(old_ymm, emu->ymm, sizeof(old_ymm));
    memcpy(old_mmx, emu->mmx, sizeof(old_mmx));
    memcpy(old_x87, emu->x87, sizeof(old_x87));
    memcpy(old_segs, emu->segs, sizeof(old_segs));
    memcpy(old_segs_offs, emu->segs_offs, sizeof(old_segs_offs));
    #define GO(A) old_##A = emu->A
    GO(eflags);
    GO(df);
    GO(op1);
    GO(op2);
    GO(res);
    #undef GO
    #ifdef DYNAREC
    dynablock_t* db = cur_db;
    if(db && ucntx) {
        void * pc =(void*)CONTEXT_PC((ucontext_t*)ucntx);
        copyUCTXreg2Emu(emu, ucntx, x64pc);
        adjustregs(emu, pc);
        if(db && db->arch_size)
            ARCH_ADJUST(db, emu, ucntx, x64pc);
    }
    #endif
    int direct_ret = 0;
    #ifdef BOX32
    if(box64_is32bits) {
        direct_ret = my_sigactionhandler_oldcode_32(emu, sig, simple, info, ucntx, old_code, cur_db);
    } else
    #endif
    direct_ret = my_sigactionhandler_oldcode_64(emu, sig, simple, info, ucntx, old_code, cur_db);
    if(direct_ret)
        return;
    #define GO(A) R_##A = old_##A
    GO(RAX);
    GO(RBX);
    GO(RCX);
    GO(RDX);
    GO(RBP);
    GO(RSP);
    GO(RDI);
    GO(RSI);
    GO(R8);
    GO(R9);
    GO(R10);
    GO(R11);
    GO(R12);
    GO(R13);
    GO(R14);
    GO(R15);
    GO(RIP);
    #undef GO
    #define GO(A) emu->A = old_##A
    GO(eflags);
    GO(df);
    GO(op1);
    GO(op2);
    GO(res);
    #undef GO
    memcpy(emu->xmm, old_xmm, sizeof(old_xmm));
    memcpy(emu->ymm, old_ymm, sizeof(old_ymm));
    memcpy(emu->mmx, old_mmx, sizeof(old_mmx));
    memcpy(emu->x87, old_x87, sizeof(old_x87));
    memcpy(emu->segs, old_segs, sizeof(old_segs));
    memcpy(emu->segs_offs, old_segs_offs, sizeof(old_segs_offs));
    emu->top = old_top;
}

extern void* current_helper;
extern int fillblock_active;
#define USE_SIGNAL_MUTEX
#ifdef USE_SIGNAL_MUTEX
#ifdef USE_CUSTOM_MUTEX
static uint32_t mutex_dynarec_prot = 0;
#else
static pthread_mutex_t mutex_dynarec_prot = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP;
#endif
#define lock_signal()     mutex_lock(&mutex_dynarec_prot)
#define unlock_signal()   mutex_unlock(&mutex_dynarec_prot)
#else   // USE_SIGNAL_MUTEX
#define lock_signal()
#define unlock_signal()
#endif

extern int box64_quit;
extern int box64_exit_code;

void my_box64signalhandler(int32_t sig, siginfo_t* info, void * ucntx)
{
    sig = signal_to_x64(sig);
    // sig==X64_SIGSEGV || sig==X64_SIGBUS || sig==X64_SIGILL || sig==X64_SIGABRT here!
    int log_minimum = (BOX64ENV(showsegv))?LOG_NONE:((((sig==X64_SIGSEGV) || (sig==X64_SIGILL)) && my_context->is_sigaction[sig])?LOG_DEBUG:LOG_INFO);
    if(signal_jmpbuf_active) {
        signal_jmpbuf_active = 0;
        longjmp(SIG_JMPBUF, 1);
    }
    ucontext_t *p = (ucontext_t *)ucntx;
    void* addr = (void*)info->si_addr;  // address that triggered the issue
    void* rsp = NULL;
    x64emu_t* emu = thread_get_emu();
    int tid = GetTID();
#ifdef __aarch64__
    void * pc = (void*)p->uc_mcontext.pc;
    struct fpsimd_context *fpsimd = NULL;
    // find fpsimd struct
    {
        struct _aarch64_ctx * ff = (struct _aarch64_ctx*)p->uc_mcontext.__reserved;
        while (ff->magic && !fpsimd) {
            if(ff->magic==FPSIMD_MAGIC)
                fpsimd = (struct fpsimd_context*)ff;
            else
                ff = (struct _aarch64_ctx*)((uintptr_t)ff + ff->size);
        }
    }
#elif defined __x86_64__
    void * pc = (void*)p->uc_mcontext.gregs[X64_RIP];
    void* fpsimd = NULL;
#elif defined __powerpc64__
    void * pc = (void*)p->uc_mcontext.gp_regs[PT_NIP];
    void* fpsimd = NULL;
#elif defined(LA64)
    void * pc = (void*)p->uc_mcontext.__pc;
    void* fpsimd = NULL;
#elif defined(SW64)
    void * pc = (void*)p->uc_mcontext.sc_pc;
    void* fpsimd = NULL;
#elif defined(RV64)
    void * pc = (void*)p->uc_mcontext.__gregs[REG_PC];
    void* fpsimd = NULL;
#else
    void * pc = NULL;    // unknow arch...
    void* fpsimd = NULL;
    #warning Unhandled architecture
#endif
    dynablock_t* db = NULL;
    int db_searched = 0;
    uintptr_t x64pc = (uintptr_t)-1;
    x64pc = R_RIP;
    if(((sig==X64_SIGBUS) && ((addr!=pc) || ((sig==X64_SIGSEGV) && emu->segs[_CS]==0x23 && ((uintptr_t)addr>>32)==0xffffffff)))
#ifdef RV64
    || ((sig==X64_SIGSEGV) && (addr==pc) && (info->si_code==2) && (!checkMutex(is_memprot_locked) && getProtection_fast((uintptr_t)addr)==(PROT_READ|PROT_WRITE|PROT_EXEC)))
#endif
    )
    {
        db = FindDynablockFromNativeAddress(pc);
        if(db)
            x64pc = getX64Address(db, (uintptr_t)pc);
        db_searched = 1;
        int fixed = 0;
        if((fixed=sigbus_specialcases(info, ucntx, pc, fpsimd, db, x64pc, emu->segs[_CS]==0x23))) {
            // special case fixed, restore everything and just continues
            if (BOX64ENV(log)>=LOG_DEBUG || BOX64ENV(showsegv)) {
                static void*  old_pc[2] = {0};
                static int old_pc_i = 0;
                if(old_pc[0]!=pc && old_pc[1]!=pc) {
                    old_pc[old_pc_i++] = pc;
                    if(old_pc_i==2)
                        old_pc_i = 0;
                    uint8_t* x64 = (uint8_t*)x64pc;
                    if(db)
                        printf_log(LOG_INFO, "Special unaligned case fixed @%p, opcode=%08x (addr=%p, db=%p, x64pc=%p[%02hhX %02hhX %02hhX %02hhX %02hhX])\n", pc, *(uint32_t*)pc, addr, db, x64pc, x64[0], x64[1], x64[2], x64[3], x64[4], x64[5]);
                    else
                        printf_log(LOG_INFO, "Special unaligned case fixed @%p, opcode=%08x (addr=%p)\n", pc, *(uint32_t*)pc, addr);
                }
            }
            return;
        }
    }
    #ifdef ARCH_NOP
    if(sig==X64_SIGILL) {
        if(!db_searched) {
            db = FindDynablockFromNativeAddress(pc);
            if(db)
                x64pc = getX64Address(db, (uintptr_t)pc);   // this will be incorect in the case of the callret!
            db_searched = 1;
        }
        if(db && db->callret_size) {
            int is_callrets = 0;
            int type_callret = 0;
            for(int i=0; i<db->callret_size && !is_callrets; ++i)
                if(pc==(db->block+db->callrets[i].offs)) {
                    is_callrets = 1;
                    type_callret = db->callrets[i].type;
                }
            if(is_callrets) {
                if(!type_callret) {
                    // adjust x64pc for "ret" type
                    x64pc = CONTEXT_REG(p, xRIP);
                }
                // check if block is still valid
                int is_hotpage = checkInHotPage(x64pc);
                uint32_t hash = (db->gone || is_hotpage)?0:X31_hash_code(db->x64_addr, db->x64_size);
                if(!db->gone && (!is_hotpage || db->autocrc) && hash==db->hash) {
                    dynarec_log(LOG_INFO, "Dynablock (%p, x64addr=%p, always_test=%d, autocrc=%d) is clean, %s continuing at %p (%p)!\n", db, db->x64_addr, db->always_test, db->autocrc, type_callret?"self-loop":"ret from callret", (void*)x64pc, (void*)addr);
                    // it's good! go next opcode
                    CONTEXT_PC(p)+=4;
                    if(db->always_test)
                        protectDB((uintptr_t)db->x64_addr, 1);
                    else {
                        if(db->callret_size) {
                            // mark all callrets to NOP
                            for(int i=0; i<db->callret_size; ++i)
                                *(uint32_t*)(db->block+db->callrets[i].offs) = ARCH_NOP;
                            ClearCache(db->block, db->size);
                        }
                        protectDBJumpTable((uintptr_t)db->x64_addr, db->x64_size, db->block, db->jmpnext);
                        for(int i=0; i<db->sep_size; ++i) {
                            uint32_t x64_offs = db->sep[i].x64_offs;
                            uint32_t nat_offs = db->sep[i].nat_offs;
                            if(addJumpTableIfDefault64(db->x64_addr+x64_offs, (db->always_test)?db->jmpnext:(db->block+nat_offs)))
                                db->sep[i].active = 1;
                            else
                                db->sep[i].active = 0;
                        }
                    }
                    return;
                } else {
                    // dynablock got dirty! need to get out of it!!!
                    copyUCTXreg2Emu(emu, p, x64pc);
                    // only copy as it's a return address, so there is just the "epilog" to mimic here on "ret" type. "loop" type need everything
                    if(type_callret) {
                        adjustregs(emu, pc);
                        if(db && db->arch_size)
                            ARCH_ADJUST(db, emu, p, x64pc);
                    }
                    dynarec_log(LOG_INFO, "Dynablock (%p, x64addr=%p) %s, getting out at %s %p (%p)!\n", db, db->x64_addr, is_hotpage?"in HotPage":"dirty", getAddrFunctionName(R_RIP), (void*)R_RIP, type_callret?"self-loop":"ret from callret", (void*)addr);
                    emu->test.clean = 0;
                    // use "3" to regen a dynablock at current pc (else it will first do an interp run)
                    dynablock_leave_runtime(db);
                    copyEmu2USignalCTXreg(p, emu, native_epilog);
                    return;
                }
            }
else dynarec_log(LOG_INFO, "SIGILL at %p/%p for Dynablock (%p, x64addr=%p) with %d callrets info, but not a callret offset\n", pc, addr, db, db->x64_addr, db->callret_size);
        }
    }
    #endif
    int Locks = unlockMutex();
    uint32_t prot = getProtection((uintptr_t)addr);
    #ifdef BAD_SIGNAL
    // try to see if the si_code makes sense
    // the RK3588 tend to need a special Kernel that seems to have a weird behaviour sometimes
    if((sig==X64_SIGSEGV) && (addr) && (info->si_code == 1) && getMAllocated((uintptr_t)addr)) {
        printf_log(LOG_DEBUG, "Workaround for suspicious si_code for %p / prot=0x%hhx\n", addr, prot);
        info->si_code = 2;
    }
    #endif
#ifdef DYNAREC
    if((Locks & is_dyndump_locked) && ((sig==X64_SIGSEGV) || (sig==X64_SIGBUS)) && current_helper && fillblock_active) {
        printf_log(LOG_INFO, "FillBlock triggered a %s at %p from %p\n", (sig==X64_SIGSEGV)?"segfault":"bus error", addr, pc);
        relockMutex(Locks);
        cancelFillBlock();  // Segfault inside a Fillblock, cancel it's creation...
        // cancelFillBlock does not return
    }
    if ((sig==X64_SIGSEGV) && (addr) && (info->si_code == SEGV_ACCERR) && (prot&PROT_DYNAREC)) {
        lock_signal();
        // check if SMC inside block
        if(!db_searched) {
            db = FindDynablockFromNativeAddress(pc);
            if(db)
                x64pc = getX64Address(db, (uintptr_t)pc);
            db_searched = 1;
        }
        // access error, unprotect the block (and mark them dirty)
        CheckHotPage((uintptr_t)addr, prot);
        unprotectDB((uintptr_t)addr, 1, 1);    // unprotect 1 byte... But then, the whole page will be unprotected
        int db_need_test = (db && !BOX64ENV(dynarec_dirty))?getNeedTest((uintptr_t)db->x64_addr):0;
        if(db && ((addr>=db->x64_addr && addr<(db->x64_addr+db->x64_size)) || db_need_test)) {
            emu = getEmuSignal(emu, p, db);
            // dynablock got auto-dirty! need to get out of it!!!
            uintptr_t x64pc = getX64Address(db, (uintptr_t)pc);
            copyUCTXreg2Emu(emu, p, x64pc);
            adjustregs(emu, pc);
            if(db && db->arch_size)
                ARCH_ADJUST(db, emu, p, x64pc);
            int autosmc = (addr>=db->x64_addr && addr<(db->x64_addr+db->x64_size));
            if(autosmc && BOX64ENV(dynarec_dirty)) {
                // check if current block should be cut there
                int inst = getX64AddressInst(db, (uintptr_t)pc);
                // is it the last instruction
                uintptr_t next = getX64InstAddress(db, inst+1);
                if(next!=(uintptr_t)-1LL) {
                    // there is a next, so lets mark the address and dirty the block
                    mark_db_autosmc(db, x64pc);
                }

            }
            dynarec_log(LOG_INFO, "Dynablock (%p, x64addr=%p, need_test=%d/%d/%d) %s, getting out at %p (%p)!\n", db, db->x64_addr, db_need_test, db->dirty, db->always_test, autosmc?"Auto-SMC":"unprotected", (void*)R_RIP, (void*)addr);
            //relockMutex(Locks);
            unlock_signal();
            if(Locks & is_dyndump_locked)
                CancelBlock64(1);
            emu->test.clean = 0;
            // will restore unblocked Signal flags too
            dynablock_leave_runtime(db);
            copyEmu2USignalCTXreg(p, emu, native_epilog);
            return;
        }
        // done
        if((prot&PROT_WRITE)/*|| (prot&PROT_DYNAREC)*/) {
            if(BOX64ENV(dynarec_log)) {
                char tmp[128] = {0};
                zydis_dec_t* dec = emu->segs[_CS] == 0x23 ? my_context->dec32 : my_context->dec;
                if (dec)
                snprintf(tmp, 127, " %sopcode=%s; native opcode=%08x", (emu->segs[_CS] == 0x23) ? "x86" : "x64", DecodeX64Trace(dec, x64pc, 1), *(uint32_t*)pc);
                else
                snprintf(tmp, 127, " %sopcode=%02X %02X %02X %02X %02X %02X %02X %02X (opcode=%08x)", (emu->segs[_CS] == 0x23) ? "x86" : "x64", ((uint8_t*)x64pc)[0], ((uint8_t*)x64pc)[1], ((uint8_t*)x64pc)[2], ((uint8_t*)x64pc)[3], ((uint8_t*)x64pc)[4], ((uint8_t*)x64pc)[5], ((uint8_t*)x64pc)[6], ((uint8_t*)x64pc)[7], *(uint32_t*)pc);
                dynarec_log(LOG_INFO, "Writting from %04d|%p(%s, native=%s) to %p using %s\n", GetTID(), (void*)x64pc, getAddrFunctionName(x64pc), db?"Dynablock":GetNativeName(pc, 1),(void*)addr, tmp);
            }
            // if there is no write permission, don't return and continue to program signal handling
            unlock_signal();
            relockMutex(Locks);
            return;
        }
        unlock_signal();
    } else if ((sig==X64_SIGSEGV) && (addr) && (info->si_code == SEGV_ACCERR) && ((prot&(PROT_READ|PROT_WRITE))==(PROT_READ|PROT_WRITE))) {
        lock_signal();
        if(!db_searched) {
            db = FindDynablockFromNativeAddress(pc);
            if(db)
                x64pc = getX64Address(db, (uintptr_t)pc);
            db_searched = 1;
        }
        if(db && db->x64_addr>= addr && (db->x64_addr+db->x64_size)<addr) {
            dynarec_log(LOG_INFO, "Warning, addr inside current dynablock!\n");
        }
        // mark stuff as unclean
        if(BOX64ENV(dynarec))
            cleanDBFromAddressRange(((uintptr_t)addr)&~(box64_pagesize-1), box64_pagesize, 0);
        static void* glitch_pc = NULL;
        static void* glitch_addr = NULL;
        static uint32_t glitch_prot = 0;
        if(addr && pc /*&& db*/) {
            if((glitch_pc!=pc || glitch_addr!=addr || glitch_prot!=prot)) {
                // probably a glitch due to intensive multitask...
                dynarec_log(/*LOG_DEBUG*/LOG_INFO, "%04d|SIGSEGV with Access error on %p for %p, db=%p, prot=0x%x, retrying\n", tid, pc, addr, db, prot);
                glitch_pc = pc;
                glitch_addr = addr;
                glitch_prot = prot;
                relockMutex(Locks);
                unlock_signal();
                return; // try again
            }
dynarec_log(/*LOG_DEBUG*/LOG_INFO, "%04d|Repeated SIGSEGV with Access error on %p for %p, db=%p, prot=0x%x\n", tid, pc, addr, db, prot);
            glitch_pc = NULL;
            glitch_addr = NULL;
            glitch_prot = 0;
            relockMutex(Locks);
            unlock_signal();
            return; // try again
    }
        if(addr && pc && ((prot&(PROT_READ|PROT_WRITE))==(PROT_READ|PROT_WRITE))) {
            static void* glitch2_pc = NULL;
            static void* glitch2_addr = NULL;
            static int glitch2_prot = 0;
            if((glitch2_pc!=pc || glitch2_addr!=addr || glitch2_prot!=prot)) {
                dynarec_log(LOG_INFO, "Is that a multi process glitch too?\n");
                //printf_log(LOG_INFO, "Is that a multi process glitch too?\n");
                glitch2_pc = pc;
                glitch2_addr = addr;
                glitch2_prot = prot;
                sched_yield();  // give time to the other process
                refreshProtection((uintptr_t)addr);
                relockMutex(Locks);
                sched_yield();  // give time to the other process
                unlock_signal();
                return; // try again
            }
            glitch2_pc = NULL;
            glitch2_addr = NULL;
            glitch2_prot = 0;
        }
        unlock_signal();
    } else if ((sig==X64_SIGSEGV) && (addr) && (info->si_code == SEGV_ACCERR) && (prot&PROT_DYNAREC_R)) {
        // unprotect and continue to signal handler, because Write is not there on purpose
        unprotectDB((uintptr_t)addr, 1, 1);    // unprotect 1 byte... But then, the whole page will be unprotected
    }
    if(!db_searched) {
        db = FindDynablockFromNativeAddress(pc);
        if(db)
            x64pc = getX64Address(db, (uintptr_t)pc);
        db_searched = 1;
    }
#endif
    if((sig==X64_SIGSEGV || sig==X64_SIGBUS) && box64_quit) {
        printf_log(LOG_INFO, "Sigfault/Segbus while quitting, exiting silently\n");
        _exit(box64_exit_code);    // Hack, segfault while quiting, exit silently
    }
    static int old_code = -1;
    static void* old_pc = 0;
    static void* old_addr = 0;
    static int old_tid = 0;
    static uint32_t old_prot = 0;
    int mapped = memExist((uintptr_t)addr);
    const char* signame = (sig==X64_SIGSEGV)?"SIGSEGV":((sig==X64_SIGBUS)?"SIGBUS":((sig==X64_SIGILL)?"SIGILL":"SIGABRT"));
    rsp = (void*)R_RSP;
#if defined(DYNAREC)
    if(db && CONTEXT_REG(p, xEmu)>0x10000) {
        emu = (x64emu_t*)CONTEXT_REG(p, xEmu);
    }
    if(db) {
        rsp = (void*)CONTEXT_REG(p, xRSP);
    }
#endif //DYNAREC
    if(!db && (sig==X64_SIGSEGV) && ((uintptr_t)addr==(x64pc-1)))
        x64pc--;
    if((sig==X64_SIGSEGV) && (info->si_code == SEGV_ACCERR) && ((prot&~PROT_CUSTOM)==(PROT_READ|PROT_WRITE) || (prot&~PROT_CUSTOM)==(PROT_READ|PROT_WRITE|PROT_EXEC))) {
        static uintptr_t old_addr = 0;
        #ifdef DYNAREC
        if(prot==(PROT_READ|PROT_WRITE|PROT_EXEC))
            if(cleanDBFromAddressRange(((uintptr_t)addr)&~(box64_pagesize-1), box64_pagesize, 0)) {
                printf_log(/*LOG_DEBUG*/LOG_INFO, "%04d| Strange SIGSEGV with Access error on %p for %p with DynaBlock(s) in range, db=%p, Lock=0x%x)\n", tid, pc, addr, db, Locks);
                refreshProtection((uintptr_t)addr);
                relockMutex(Locks);
                return;
            }
        #endif
        printf_log(/*LOG_DEBUG*/LOG_INFO, "%04d| Strange SIGSEGV with Access error on %p for %p%s, db=%p, prot=0x%x (old_addr=%p, Lock=0x%x)\n", tid, pc, addr, mapped?" mapped":"", db, prot, (void*)old_addr, Locks);
        if(!(old_addr==(uintptr_t)addr && old_prot==prot) || mapped) {
            old_addr = (uintptr_t)addr;
            old_prot = prot;
            refreshProtection(old_addr);
            relockMutex(Locks);
            sched_yield();  // give time to the other process
            return; // that's probably just a multi-task glitch, like seen in terraria
        }
        old_addr = 0;
    }
    old_code = info->si_code;
    old_pc = pc;
    old_addr = addr;
    old_tid = tid;
    old_prot = prot;
    const char* name = NULL;
    const char* x64name = NULL;
    if (log_minimum<=BOX64ENV(log)) {
        signal_jmpbuf_active = 1;
        if(sigsetjmp(SIG_JMPBUF, 1)) {
            // segfault while gathering function name...
            name = "???";
        } else
            name = GetNativeName(pc, 1);
        signal_jmpbuf_active = 0;
    }
    // Adjust RIP for special case of NULL function run
    if(sig==X64_SIGSEGV && R_RIP==0x1 && (uintptr_t)info->si_addr==0x0)
        R_RIP = 0x0;
    if(log_minimum<=BOX64ENV(log)) {
        elfheader_t* elf = FindElfAddress(my_context, x64pc);
        {
            signal_jmpbuf_active = 1;
            if(sigsetjmp(SIG_JMPBUF, 1)) {
                // segfault while gathering function name...
                x64name = "?";
            } else
                x64name = getAddrFunctionName(x64pc);
            signal_jmpbuf_active = 0;
        }
    }
    if(BOX64ENV(jitgdb)) {
        pid_t pid = getpid();
        int v = vfork(); // is this ok in a signal handler???
        if(v<0) {
            printf("Error while forking, cannot launch gdb (errp%d/%s)\n", errno, strerror(errno));
        } else if(v) {
            // parent process, the one that have the segfault
            volatile int waiting = 1;
            printf("Waiting for %s (pid %d)...\n", (BOX64ENV(jitgdb)==2)?"gdbserver":"gdb", pid);
            while(waiting) {
                // using gdb, use "set waiting=0" to stop waiting...
                usleep(1000);
            }
        } else {
            char myarg[50] = {0};
            sprintf(myarg, "%d", pid);
            if(BOX64ENV(jitgdb)==2)
                execlp("gdbserver", "gdbserver", "127.0.0.1:1234", "--attach", myarg, (char*)NULL);
            else if(BOX64ENV(jitgdb)==3)
                execlp("lldb", "lldb", "-p", myarg, (char*)NULL);
            else
                execlp("gdb", "gdb", "-pid", myarg, (char*)NULL);
            exit(-1);
        }
    }
    print_rolling_log(log_minimum);

    if((BOX64ENV(showbt) || sig==X64_SIGABRT) && log_minimum<=BOX64ENV(log)) {
        // show native bt
        ShowNativeBT(log_minimum);

#define BT_BUF_SIZE 100
        int nptrs;
        void *buffer[BT_BUF_SIZE];
        char **strings;

        extern int my_backtrace_ip(x64emu_t* emu, void** buffer, int size);   // in wrappedlibc
        extern char** my_backtrace_symbols(x64emu_t* emu, uintptr_t* buffer, int size);
        // save and set real RIP/RSP
        #define GO(A) uintptr_t old_##A = R_##A;
        GO(RAX);
        GO(RBX);
        GO(RCX);
        GO(RDX);
        GO(RBP);
        GO(RSP);
        GO(RDI);
        GO(RSI);
        GO(R8);
        GO(R9);
        GO(R10);
        GO(R11);
        GO(R12);
        GO(R13);
        GO(R14);
        GO(R15);
        GO(RIP);
        #undef GO
        #ifdef DYNAREC
        if(db)
            copyUCTXreg2Emu(emu, p, x64pc);
        #endif
        nptrs = my_backtrace_ip(emu, buffer, BT_BUF_SIZE);
        strings = my_backtrace_symbols(emu, (uintptr_t*)buffer, nptrs);
        if(strings) {
            for (int j = 0; j < nptrs; j++)
                printf_log(log_minimum, "EmulatedBT: %s\n", strings[j]);
            free(strings);
        } else
            printf_log(log_minimum, "EmulatedBT: none\n");
        #define GO(A) R_##A = old_##A
        GO(RAX);
        GO(RBX);
        GO(RCX);
        GO(RDX);
        GO(RBP);
        GO(RSP);
        GO(RDI);
        GO(RSI);
        GO(R8);
        GO(R9);
        GO(R10);
        GO(R11);
        GO(R12);
        GO(R13);
        GO(R14);
        GO(R15);
        GO(RIP);
        #undef GO
    }
    if(log_minimum<=BOX64ENV(log)) {
        static const char* reg_name[] = {"RAX", "RCX", "RDX", "RBX", "RSP", "RBP", "RSI", "RDI", " R8", " R9","R10","R11", "R12","R13","R14","R15"};
        static const char* seg_name[] = {"ES", "CS", "SS", "DS", "FS", "GS"};
        int shown_regs = 0;
#ifdef DYNAREC
        #ifdef GDBJIT
        if(db && BOX64ENV(dynarec_gdbjit) == 3) GdbJITBlockReady(db->gdbjit_block);
        #endif
        uint32_t hash = 0;
        if(db)
            hash = X31_hash_code(db->x64_addr, db->x64_size);
        printf_log(log_minimum, "%04d|%s @%p (%s) (x64pc=%p/\"%s\", rsp=%p, stack=%p:%p own=%p fp=%p), for accessing %p (code=%d/prot=%x), db=%p(%p:%p/%p:%p/%s:%s, hash:%x/%x) handler=%p",
            GetTID(), signame, pc, name, (void*)x64pc, x64name?:"???", rsp,
            emu->init_stack, emu->init_stack+emu->size_stack, emu->stack2free, (void*)R_RBP,
            addr, info->si_code,
            prot, db, db?db->block:0, db?(db->block+db->size):0,
            db?db->x64_addr:0, db?(db->x64_addr+db->x64_size):0,
            getAddrFunctionName((uintptr_t)(db?db->x64_addr:0)),
            (db && (db->hash!=hash))?"dirty":((db?getNeedTest((uintptr_t)db->x64_addr):0)?"needs_test":"clean"), db?db->hash:0, hash,
            (void*)my_context->signals[sig]);
            if(db) {
                shown_regs = 1;
                for (int i=0; i<16; ++i) {
                    if(!(i%4)) printf_log_prefix(0, log_minimum, "\n");
                    printf_log_prefix(0, log_minimum, "%s:0x%016llx ", reg_name[i], CONTEXT_REG(p, TO_NAT(i)));
                }
                printf_log_prefix(0, log_minimum, "\n");
                for (int i=0; i<6; ++i)
                    printf_log_prefix(0, log_minimum, "%s:0x%04x ", seg_name[i], emu->segs[i]);
                printf_log_prefix(0, log_minimum, "FSBASE=%p ", emu->segs_offs[_FS]);
                printf_log_prefix(0, log_minimum, "GSBASE=%p", emu->segs_offs[_GS]);
            }
            if(rsp!=addr && getProtection((uintptr_t)rsp-4*8) && getProtection((uintptr_t)rsp+4*8))
                for (int i=-4; i<4; ++i) {
                    printf_log_prefix(0, log_minimum, "%sRSP%c0x%02x:0x%016lx", (i%4)?" ":"\n", i<0?'-':'+', abs(i)*8, *(uintptr_t*)(rsp+i*8));
                }
#else
        printf_log(log_minimum, "%04d|%s @%p (%s) (x64pc=%p/\"%s\", rsp=%p), for accessing %p (code=%d)", GetTID(), signame, pc, name, (void*)x64pc, x64name?:"???", rsp, addr, info->si_code);
#endif
        if(!shown_regs) {
            for (int i=0; i<16; ++i) {
                if(!(i%4)) printf_log_prefix(0, log_minimum, "\n");
                printf_log_prefix(0, log_minimum, "%s:0x%016llx ", reg_name[i], emu->regs[i].q[0]);
            }
            printf_log_prefix(0, log_minimum, "\n");
            for (int i=0; i<6; ++i)
                printf_log_prefix(0, log_minimum, "%s:0x%04x ", seg_name[i], emu->segs[i]);
            printf_log_prefix(0, log_minimum, "FSBASE=%p ", emu->segs_offs[_FS]);
            printf_log_prefix(0, log_minimum, "GSBASE=%p", emu->segs_offs[_GS]);
            printf_log_prefix(0, log_minimum, "\n");
        }
        zydis_dec_t* dec = emu->segs[_CS] == 0x23 ? my_context->dec32 : my_context->dec;
        if(sig==X64_SIGILL) {
            if(!db) {
                const char* fnc = getAddrFunctionName((uintptr_t)pc);
                if(fnc) printf_log_prefix(0, log_minimum, "pc=%p: %s ", pc, fnc);
            }
            printf_log_prefix(0, log_minimum, " opcode=%02X %02X %02X %02X %02X %02X %02X %02X ", ((uint8_t*)pc)[0], ((uint8_t*)pc)[1], ((uint8_t*)pc)[2], ((uint8_t*)pc)[3], ((uint8_t*)pc)[4], ((uint8_t*)pc)[5], ((uint8_t*)pc)[6], ((uint8_t*)pc)[7]);
            if (dec)
                printf_log_prefix(0, log_minimum, "(%s)\n", DecodeX64Trace(dec, x64pc, 1));
            else
                printf_log_prefix(0, log_minimum, "(%02X %02X %02X %02X %02X)\n", ((uint8_t*)x64pc)[0], ((uint8_t*)x64pc)[1], ((uint8_t*)x64pc)[2], ((uint8_t*)x64pc)[3], ((uint8_t*)x64pc)[4]);
        } else if(sig==X64_SIGBUS || (sig==X64_SIGSEGV && (x64pc!=(uintptr_t)addr) && (pc!=addr) && (getProtection_fast(x64pc)&PROT_READ) && (getProtection_fast((uintptr_t)pc)&PROT_READ))) {
            if (dec)
                printf_log_prefix(0, log_minimum, " %sopcode=%s; native opcode=%08x\n", (emu->segs[_CS] == 0x23) ? "x86" : "x64", DecodeX64Trace(dec, x64pc, 1), *(uint32_t*)pc);
            else
                printf_log_prefix(0, log_minimum, " %sopcode=%02X %02X %02X %02X %02X %02X %02X %02X (opcode=%08x)\n", (emu->segs[_CS] == 0x23) ? "x86" : "x64", ((uint8_t*)x64pc)[0], ((uint8_t*)x64pc)[1], ((uint8_t*)x64pc)[2], ((uint8_t*)x64pc)[3], ((uint8_t*)x64pc)[4], ((uint8_t*)x64pc)[5], ((uint8_t*)x64pc)[6], ((uint8_t*)x64pc)[7], *(uint32_t*)pc);
        } else {
            printf_log_prefix(0, log_minimum, "\n");
        }
    }
    relockMutex(Locks);
    if(my_context->signals[sig] && my_context->signals[sig]!=1) {
        my_sigactionhandler_oldcode(emu, sig, my_context->is_sigaction[sig]?0:1, info, ucntx, &old_code, db, x64pc);
        return;
    }
    // no handler
    // set default and that's it, instruction will restart and default segfault handler will be called...
    if(my_context->signals[sig]!=1 || sig==X64_SIGSEGV || sig==X64_SIGILL || sig==X64_SIGFPE || sig==X64_SIGABRT) {
        signal(signal_from_x64(sig), (void*)my_context->signals[sig]);
    }
}

void my_sigactionhandler(int32_t sig, siginfo_t* info, void * ucntx)
{
    sig = signal_to_x64(sig);
    x64emu_t* emu = thread_get_emu_no_create();
    if (defer_signal(emu, sig, info))
        return;
    void* pc = NULL;
    #ifdef DYNAREC
    ucontext_t *p = (ucontext_t *)ucntx;
    pc = (void*)CONTEXT_PC(p);
    #endif
    dynablock_t* db = FindDynablockFromNativeAddress(pc);
    if (!emu) emu = thread_get_emu();
    uintptr_t x64pc = R_RIP;
    if(db)
        x64pc = getX64Address(db, (uintptr_t)pc);
    #ifdef DYNAREC
    if(db && !x64pc) {
        printf_log(LOG_INFO, "Warning, ingnoring incoherent dynablock found for address %p (opcode=%x). db=%p(x64_addr=%p-%p, block:%p-%p)\n", pc, *(uint32_t*)pc, db, (void*)db->x64_addr, (void*)db->x64_addr+db->x64_size, db->actual_block, db->actual_block+db->size);
        db = NULL;
        x64pc = R_RIP;
    }
    #endif
    if(BOX64ENV(showsegv) && (sig!=10 || BOX64ENV(log)>LOG_INFO)) {
        printf_log(LOG_INFO, "%04d|sigaction handler for sig %d, pc=%p, x64pc=%p, db=%p%s", GetTID(), sig, pc, x64pc, db, db?"":"\n");
        #ifdef DYNAREC
        if(db)
            printf_log_prefix(0, LOG_INFO, "(x64_addr=%p-%p, block:%p-%p)\n", (void*)db->x64_addr, (void*)db->x64_addr+db->x64_size, db->actual_block, db->actual_block+db->size);
        #endif
    }
    my_sigactionhandler_oldcode(emu, sig, 0, info, ucntx, NULL, db, x64pc);
}
#define MY_SIGHANDLER ((signum==X64_SIGSEGV || signum==X64_SIGBUS || signum==X64_SIGILL || signum==X64_SIGABRT)?my_box64signalhandler:my_sigactionhandler)
EXPORT sighandler_t my_signal(x64emu_t* emu, int signum, sighandler_t handler)
{
    if(signum<0 || signum>MAX_SIGNAL)
        return SIG_ERR;

    if(signum==X64_SIGSEGV && emu->context->no_sigsegv)
        return 0;

    // create a new handler
    my_context->signals[signum] = (uintptr_t)handler;
    my_context->is_sigaction[signum] = 0;
    my_context->restorer[signum] = 0;
    my_context->onstack[signum] = 0;

    if(signum==X64_SIGSEGV || signum==X64_SIGBUS || signum==X64_SIGILL || signum==X64_SIGABRT)
        return 0;

    if(handler!=NULL && handler!=(sighandler_t)1) {
        struct sigaction newact = {0};
        struct sigaction oldact = {0};
        newact.sa_flags = 0x04;
        newact.sa_sigaction = MY_SIGHANDLER;
        if(sigaction(signal_from_x64(signum), &newact, &oldact)<0)
            return SIG_ERR;
        return oldact.sa_handler;
    } else
        return signal(signal_from_x64(signum), handler);
}
EXPORT sighandler_t my___sysv_signal(x64emu_t* emu, int signum, sighandler_t handler) __attribute__((alias("my_signal")));
EXPORT sighandler_t my_sysv_signal(x64emu_t* emu, int signum, sighandler_t handler) __attribute__((alias("my_signal")));    // not completely exact

int EXPORT my_sigaction(x64emu_t* emu, int signum, const x64_sigaction_t *act, x64_sigaction_t *oldact)
{
    printf_log(LOG_DEBUG, "Sigaction(signum=%d, act=%p(f=%p, flags=0x%x), old=%p)\n", signum, act, act?act->_u._sa_handler:NULL, act?act->sa_flags:0, oldact);
    if(signum<0 || signum>MAX_SIGNAL) {
        errno = EINVAL;
        return -1;
    }

    if(signum==X64_SIGSEGV && emu->context->no_sigsegv)
        return 0;

    if(signum==X64_SIGILL && emu->context->no_sigill)
        return 0;
    struct sigaction newact = {0};
    struct sigaction old = {0};
    uintptr_t old_handler = my_context->signals[signum];
    if(act) {
        newact.sa_mask = act->sa_mask;
        newact.sa_flags = act->sa_flags&~0x04000000;  // No sa_restorer...
        if(act->sa_flags&0x04) {
            my_context->signals[signum] = (uintptr_t)act->_u._sa_sigaction;
            my_context->is_sigaction[signum] = 1;
            if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                newact.sa_sigaction = MY_SIGHANDLER;
            } else
                newact.sa_sigaction = act->_u._sa_sigaction;
        } else {
            my_context->signals[signum] = (uintptr_t)act->_u._sa_handler;
            my_context->is_sigaction[signum] = 0;
            if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                newact.sa_flags|=0x04;
                newact.sa_sigaction = MY_SIGHANDLER;
            } else
                newact.sa_handler = act->_u._sa_handler;
        }
        my_context->restorer[signum] = (act->sa_flags&0x04000000)?(uintptr_t)act->sa_restorer:0;
        my_context->onstack[signum] = (act->sa_flags&SA_ONSTACK)?1:0;
    }
    int ret = 0;
    if(signum!=X64_SIGSEGV && signum!=X64_SIGBUS && signum!=X64_SIGILL && signum!=X64_SIGABRT)
        ret = sigaction(signal_from_x64(signum), act?&newact:NULL, oldact?&old:NULL);
    if(oldact) {
        oldact->sa_flags = old.sa_flags;
        oldact->sa_mask = old.sa_mask;
        if(old.sa_flags & 0x04)
            oldact->_u._sa_sigaction = old.sa_sigaction; //TODO should wrap...
        else
            oldact->_u._sa_handler = old.sa_handler;  //TODO should wrap...
        if((uintptr_t)oldact->_u._sa_sigaction == (uintptr_t)MY_SIGHANDLER && old_handler)
            oldact->_u._sa_sigaction = (void*)old_handler;
        oldact->sa_restorer = NULL; // no handling for now...
    }
    return ret;
}
int EXPORT my___sigaction(x64emu_t* emu, int signum, const x64_sigaction_t *act, x64_sigaction_t *oldact)
__attribute__((alias("my_sigaction")));

int EXPORT my_syscall_rt_sigaction(x64emu_t* emu, int signum, const x64_sigaction_restorer_t *act, x64_sigaction_restorer_t *oldact, int sigsetsize)
{
    printf_log(LOG_DEBUG, "Syscall/Sigaction(signum=%d, act=%p, old=%p, size=%d)\n", signum, act, oldact, sigsetsize);
    if(signum<0 || signum>MAX_SIGNAL) {
        errno = EINVAL;
        return -1;
    }

    if(signum==X64_SIGSEGV && emu->context->no_sigsegv)
        return 0;
    // TODO, how to handle sigsetsize>4?!
    if(signum==32 || signum==33) {
        // cannot use libc sigaction, need to use syscall!
        struct kernel_sigaction newact = {0};
        struct kernel_sigaction old = {0};
        if(act) {
            printf_log(LOG_DEBUG, " New (kernel) action flags=0x%x mask=0x%lx\n", act->sa_flags, *(uint64_t*)&act->sa_mask);
            memcpy(&newact.sa_mask, &act->sa_mask, (sigsetsize>16)?16:sigsetsize);
            newact.sa_flags = act->sa_flags&~0x04000000;  // No sa_restorer...
            if(act->sa_flags&0x04) {
                my_context->signals[signum] = (uintptr_t)act->_u._sa_sigaction;
                my_context->is_sigaction[signum] = 1;
                if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                    newact.k_sa_handler = (void*)MY_SIGHANDLER;
                } else {
                    newact.k_sa_handler = (void*)act->_u._sa_sigaction;
                }
            } else {
                my_context->signals[signum] = (uintptr_t)act->_u._sa_handler;
                my_context->is_sigaction[signum] = 0;
                if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                    newact.sa_flags|=0x4;
                    newact.k_sa_handler = (void*)MY_SIGHANDLER;
                } else {
                    newact.k_sa_handler = act->_u._sa_handler;
                }
            }
            my_context->restorer[signum] = (act->sa_flags&0x04000000)?(uintptr_t)act->sa_restorer:0;
        }

        if(oldact) {
            old.sa_flags = oldact->sa_flags;
            memcpy(&old.sa_mask, &oldact->sa_mask, (sigsetsize>16)?16:sigsetsize);
        }

        int ret = syscall(__NR_rt_sigaction, signum, act?&newact:NULL, oldact?&old:NULL, (sigsetsize>16)?16:sigsetsize);
        if(oldact && ret==0) {
            oldact->sa_flags = old.sa_flags;
            memcpy(&oldact->sa_mask, &old.sa_mask, (sigsetsize>16)?16:sigsetsize);
            if(old.sa_flags & 0x04)
                oldact->_u._sa_sigaction = (void*)old.k_sa_handler; //TODO should wrap...
            else
                oldact->_u._sa_handler = old.k_sa_handler;  //TODO should wrap...
        }
        return ret;
    } else {
        // using libc sigaction
        struct sigaction newact = {0};
        struct sigaction old = {0};
        if(act) {
            printf_log(LOG_DEBUG, " New action for signal #%d flags=0x%x mask=0x%lx\n", signum, act->sa_flags, *(uint64_t*)&act->sa_mask);
            newact.sa_mask = act->sa_mask;
            newact.sa_flags = act->sa_flags&~0x04000000;  // No sa_restorer...
            if(act->sa_flags&0x04) {
                if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                    my_context->signals[signum] = (uintptr_t)act->_u._sa_sigaction;
                    newact.sa_sigaction = MY_SIGHANDLER;
                } else {
                    newact.sa_sigaction = act->_u._sa_sigaction;
                }
            } else {
                if(act->_u._sa_handler!=NULL && act->_u._sa_handler!=(sighandler_t)1) {
                    my_context->signals[signum] = (uintptr_t)act->_u._sa_handler;
                    my_context->is_sigaction[signum] = 0;
                    newact.sa_sigaction = MY_SIGHANDLER;
                    newact.sa_flags|=0x4;
                } else {
                    newact.sa_handler = act->_u._sa_handler;
                }
            }
            my_context->restorer[signum] = (act->sa_flags&0x04000000)?(uintptr_t)act->sa_restorer:0;
        }

        if(oldact) {
            old.sa_flags = oldact->sa_flags;
            old.sa_mask = oldact->sa_mask;
        }
        int ret = 0;

        if(signum!=X64_SIGSEGV && signum!=X64_SIGBUS && signum!=X64_SIGILL && signum!=X64_SIGABRT)
            ret = sigaction(signal_from_x64(signum), act?&newact:NULL, oldact?&old:NULL);
        if(oldact && ret==0) {
            oldact->sa_flags = old.sa_flags;
            memcpy(&oldact->sa_mask, &old.sa_mask, (sigsetsize>8)?8:sigsetsize);
            if(old.sa_flags & 0x04)
                oldact->_u._sa_sigaction = old.sa_sigaction; //TODO should wrap...
            else
                oldact->_u._sa_handler = old.sa_handler;  //TODO should wrap...
        }
        return ret;
    }
}

EXPORT sighandler_t my_sigset(x64emu_t* emu, int signum, sighandler_t handler)
{
    signum = signal_from_x64(signum);
    // emulated SIG_HOLD
    if(handler == (sighandler_t)2) {
        x64_sigaction_t oact;
        sigset_t nset;
        sigset_t oset;
        if (sigemptyset (&nset) < 0)
            return (sighandler_t)-1;
        if (sigaddset (&nset, signum) < 0)
            return (sighandler_t)-1;
        if (sigprocmask (SIG_BLOCK, &nset, &oset) < 0)
            return (sighandler_t)-1;
        if (sigismember (&oset, signum))
            return (sighandler_t)2;
        if (my_sigaction (emu, signum, NULL, &oact) < 0)
            return (sighandler_t)-1;
        return oact._u._sa_handler;
    }
    return my_signal(emu, signum, handler);
}

EXPORT int my_getcontext(x64emu_t* emu, void* ucp)
{
//    printf_log(LOG_NONE, "Warning: call to partially implemented getcontext\n");
    x64_ucontext_t *u = (x64_ucontext_t*)ucp;
    // stack traking
    u->uc_stack.ss_sp = NULL;
    u->uc_stack.ss_size = 0;    // this need to filled
    // get general register
    u->uc_mcontext.gregs[X64_RAX] = R_RAX;
    u->uc_mcontext.gregs[X64_RCX] = R_RCX;
    u->uc_mcontext.gregs[X64_RDX] = R_RDX;
    u->uc_mcontext.gregs[X64_RDI] = R_RDI;
    u->uc_mcontext.gregs[X64_RSI] = R_RSI;
    u->uc_mcontext.gregs[X64_RBP] = R_RBP;
    u->uc_mcontext.gregs[X64_RIP] = *(uint64_t*)R_RSP;
    u->uc_mcontext.gregs[X64_RSP] = R_RSP+sizeof(uintptr_t);
    u->uc_mcontext.gregs[X64_RBX] = R_RBX;
    u->uc_mcontext.gregs[X64_R8] = R_R8;
    u->uc_mcontext.gregs[X64_R9] = R_R9;
    u->uc_mcontext.gregs[X64_R10] = R_R10;
    u->uc_mcontext.gregs[X64_R11] = R_R11;
    u->uc_mcontext.gregs[X64_R12] = R_R12;
    u->uc_mcontext.gregs[X64_R13] = R_R13;
    u->uc_mcontext.gregs[X64_R14] = R_R14;
    u->uc_mcontext.gregs[X64_R15] = R_R15;
    // get segments
    u->uc_mcontext.gregs[X64_CSGSFS] = ((uint64_t)(R_CS)) | (((uint64_t)(R_GS))<<16) | (((uint64_t)(R_FS))<<32) | (((uint64_t)(R_SS))<<48);
    // get FloatPoint status
    u->uc_mcontext.fpregs = ucp + 408;
    fpu_savenv(emu, (void*)u->uc_mcontext.fpregs, 1);
    *(uint32_t*)(ucp + 432) = emu->mxcsr.x32;

    // get signal mask
    sigprocmask(SIG_SETMASK, NULL, (sigset_t*)&u->uc_sigmask);

    return 0;
}

EXPORT int my_setcontext(x64emu_t* emu, void* ucp)
{
//    printf_log(LOG_NONE, "Warning: call to partially implemented setcontext\n");
    x64_ucontext_t *u = (x64_ucontext_t*)ucp;
    // stack tracking
    emu->init_stack = u->uc_stack.ss_sp;
    emu->size_stack = u->uc_stack.ss_size;
    // set general register
    R_RAX = u->uc_mcontext.gregs[X64_RAX];
    R_RCX = u->uc_mcontext.gregs[X64_RCX];
    R_RDX = u->uc_mcontext.gregs[X64_RDX];
    R_RDI = u->uc_mcontext.gregs[X64_RDI];
    R_RSI = u->uc_mcontext.gregs[X64_RSI];
    R_RBP = u->uc_mcontext.gregs[X64_RBP];
    R_RIP = u->uc_mcontext.gregs[X64_RIP];
    R_RSP = u->uc_mcontext.gregs[X64_RSP];
    R_RBX = u->uc_mcontext.gregs[X64_RBX];
    R_R8  = u->uc_mcontext.gregs[X64_R8];
    R_R9  = u->uc_mcontext.gregs[X64_R9];
    R_R10 = u->uc_mcontext.gregs[X64_R10];
    R_R11 = u->uc_mcontext.gregs[X64_R11];
    R_R12 = u->uc_mcontext.gregs[X64_R12];
    R_R13 = u->uc_mcontext.gregs[X64_R13];
    R_R14 = u->uc_mcontext.gregs[X64_R14];
    R_R15 = u->uc_mcontext.gregs[X64_R15];
    // get segments
    R_CS = (u->uc_mcontext.gregs[X64_CSGSFS]>> 0)&0xffff;
    R_GS = (u->uc_mcontext.gregs[X64_CSGSFS]>>16)&0xffff;
    R_FS = (u->uc_mcontext.gregs[X64_CSGSFS]>>32)&0xffff;
    R_SS = (u->uc_mcontext.gregs[X64_CSGSFS]>>48)&0xffff;
    // set FloatPoint status
    fpu_loadenv(emu, (void*)u->uc_mcontext.fpregs, 1);
    emu->mxcsr.x32 = *(uint32_t*)(ucp + 432);
    // set signal mask
    sigprocmask(SIG_SETMASK, (sigset_t*)&u->uc_sigmask, NULL);
    errno = 0;

    return R_EAX;
}
void vFEv(x64emu_t *emu, uintptr_t fnc);
EXPORT void my_start_context(x64emu_t* emu)
{
    // this is call indirectly by swapcontext from a makecontext, and will link context or just exit
    x64_ucontext_t *u = *(x64_ucontext_t**)R_RBX;
    if(u)
        my_setcontext(emu, u);
    else
        emu->quit = 1;
}

EXPORT void my_makecontext(x64emu_t* emu, void* ucp, void* fnc, int32_t argc, int64_t* argv)
{
//    printf_log(LOG_NONE, "Warning: call to unimplemented makecontext\n");
    x64_ucontext_t *u = (x64_ucontext_t*)ucp;
    // setup stack
    uintptr_t* rsp = (uintptr_t*)(u->uc_stack.ss_sp + u->uc_stack.ss_size - sizeof(uintptr_t));
    // setup the function
    u->uc_mcontext.gregs[X64_RIP] = (intptr_t)fnc;
    // setup return to private start_context uc_link
    *rsp = (uintptr_t)u->uc_link;
    u->uc_mcontext.gregs[X64_RBX] = (uintptr_t)rsp;
    --rsp;
    // setup args
    int n = 3;
    int j = 0;
    int regs_abi[] = {_DI, _SI, _DX, _CX, _R8, _R9};
    for (int i=0; i<argc; ++i) {
        // get value first
        uint32_t v;
        if(n<6)
            v = emu->regs[regs_abi[n++]].dword[0];
        else
            v = argv[j++];
        // push value
        switch(i) {
            case 0: u->uc_mcontext.gregs[X64_RDI] = v; break;
            case 1: u->uc_mcontext.gregs[X64_RSI] = v; break;
            case 2: u->uc_mcontext.gregs[X64_RDX] = v; break;
            case 3: u->uc_mcontext.gregs[X64_RCX] = v; break;
            case 4: u->uc_mcontext.gregs[X64_R8] = v; break;
            case 5: u->uc_mcontext.gregs[X64_R9] = v; break;
            default:
                --rsp;
                *rsp = argv[(argc-1)-i];
        }
    }
    // push the return value
    --rsp;
    *rsp = AddCheckBridge(my_context->system, vFEv, my_start_context, 0, "my_start_context");//my_context->exit_bridge;
    u->uc_mcontext.gregs[X64_RSP] = (uintptr_t)rsp;
}

void box64_abort() {
    if(BOX64ENV(showbt) && LOG_INFO<=BOX64ENV(log)) {
            // show native bt
            #define BT_BUF_SIZE 100
            int nptrs;
            void *buffer[BT_BUF_SIZE];
            char **strings;
            x64emu_t* emu = thread_get_emu();

#ifndef ANDROID
            nptrs = backtrace(buffer, BT_BUF_SIZE);
            strings = backtrace_symbols(buffer, nptrs);
            if(strings) {
                for (int j = 0; j < nptrs; j++)
                    printf_log(LOG_INFO, "NativeBT: %s\n", strings[j]);
                free(strings);
            } else
                printf_log(LOG_INFO, "NativeBT: none (%d/%s)\n", errno, strerror(errno));
#endif
            extern int my_backtrace_ip(x64emu_t* emu, void** buffer, int size);   // in wrappedlibc
            extern char** my_backtrace_symbols(x64emu_t* emu, uintptr_t* buffer, int size);
            nptrs = my_backtrace_ip(emu, buffer, BT_BUF_SIZE);
            strings = my_backtrace_symbols(emu, (uintptr_t*)buffer, nptrs);
            if(strings) {
                for (int j = 0; j < nptrs; j++)
                    printf_log(LOG_INFO, "EmulatedBT: %s\n", strings[j]);
                free(strings);
            } else
                printf_log(LOG_INFO, "EmulatedBT: none\n");
        }
    abort();
}


EXPORT int my_swapcontext(x64emu_t* emu, void* ucp1, void* ucp2)
{
//    printf_log(LOG_NONE, "Warning: call to unimplemented swapcontext\n");
    // grab current context in ucp1
    my_getcontext(emu, ucp1);
    // activate ucp2
    my_setcontext(emu, ucp2);
    return 0;
}

#ifdef USE_SIGNAL_MUTEX
static void atfork_child_dynarec_prot(void)
{
    #ifdef USE_CUSTOM_MUTEX
    native_lock_store(&mutex_dynarec_prot, 0);
    #else
    pthread_mutex_t tmp = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP;
    memcpy(&mutex_dynarec_prot, &tmp, sizeof(mutex_dynarec_prot));
    #endif
}
#endif
void init_signal_helper(box64context_t* context)
{
    // setup signal handling
    for(int i=0; i<=MAX_SIGNAL; ++i) {
        context->signals[i] = 0;    // SIG_DFL
    }
    struct sigaction action = {0};
    action.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
    action.sa_sigaction = my_box64signalhandler;
    sigaction(SIGSEGV, &action, NULL);
    action.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
    action.sa_sigaction = my_box64signalhandler;
    sigaction(SIGBUS, &action, NULL);
    action.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
    action.sa_sigaction = my_box64signalhandler;
    sigaction(SIGILL, &action, NULL);
    action.sa_flags = SA_SIGINFO | SA_RESTART | SA_NODEFER;
    action.sa_sigaction = my_box64signalhandler;
    sigaction(SIGABRT, &action, NULL);

    pthread_once(&sigstack_key_once, sigstack_key_alloc);
#ifdef USE_SIGNAL_MUTEX
    atfork_child_dynarec_prot();
    pthread_atfork(NULL, NULL, atfork_child_dynarec_prot);
#endif
}

void fini_signal_helper()
{
    signal(SIGSEGV, SIG_DFL);
    signal(SIGBUS, SIG_DFL);
    signal(SIGILL, SIG_DFL);
    signal(SIGABRT, SIG_DFL);
}

#ifdef NEED_SIG_CONV
int signal_to_x64(int sig)
{
    #define GO(A) case A: return X64_##A;
    switch(sig) {
        SUPER_SIGNAL
    }
    #undef GO
    return sig;
}
int signal_from_x64(int sig)
{
    #define GO(A) case X64_##A: return A;
    switch(sig) {
        SUPER_SIGNAL
    }
    #undef GO
    return sig;
}
#endif
