/* ARM64 Assembly Code - Debugging Reference */ .text .align 4 .global debug_breakpoint_handler debug_breakpoint_handler: // Save context stp x29, x30, [sp, #-16]! mov x29, sp // Save all general purpose registers stp x0, x1, [sp, #-16]! stp x2, x3, [sp, #-16]! stp x4, x5, [sp, #-16]! stp x6, x7, [sp, #-16]! stp x8, x9, [sp, #-16]! stp x10, x11, [sp, #-16]! stp x12, x13, [sp, #-16]! stp x14, x15, [sp, #-16]! stp x16, x17, [sp, #-16]! stp x18, x19, [sp, #-16]! stp x20, x21, [sp, #-16]! stp x22, x23, [sp, #-16]! stp x24, x25, [sp, #-16]! stp x26, x27, [sp, #-16]! stp x28, x29, [sp, #-16]! // Get exception syndrome mrs x0, esr_el1 ubfx x1, x0, #26, #6 // Extract exception class EC cmp x1, #0x3c // Check if BRK instruction b.ne not_breakpoint // Extract the immediate from BRK instruction ubfx x0, x0, #5, #16 // Extract immediate // Look up breakpoint handler adrp x1, breakpoint_table add x1, x1, :lo12:breakpoint_table // Call appropriate handler bl call_breakpoint_handler // Increment ELR to skip the breakpoint instruction mrs x0, elr_el1 add x0, x0, #4 msr elr_el1, x0 not_breakpoint: // Restore registers ldp x28, x29, [sp], #16 ldp x26, x27, [sp], #16 ldp x24, x25, [sp], #16 ldp x22, x23, [sp], #16 ldp x20, x21, [sp], #16 ldp x18, x19, [sp], #16 ldp x16, x17, [sp], #16 ldp x14, x15, [sp], #16 ldp x12, x13, [sp], #16 ldp x10, x11, [sp], #16 ldp x8, x9, [sp], #16 ldp x6, x7, [sp], #16 ldp x4, x5, [sp], #16 ldp x2, x3, [sp], #16 ldp x0, x1, [sp], #16 // Return ldp x29, x30, [sp], #16 eret // Memory Dump Function .global memory_dump memory_dump: stp x29, x30, [sp, #-16]! mov x29, sp // Save registers stp x19, x20, [sp, #-16]! stp x21, x22, [sp, #-16]! // x0 = address, x1 = size mov x19, x0 mov x20, x1 // Set up loop mov x21, #0 dump_loop: cmp x21, x20 b.ge dump_done // Print address mov x0, x19 add x0, x0, x21 bl print_address // Print byte at address ldrb w0, [x19, x21] bl print_byte // Next byte add x21, x21, #1 b dump_loop dump_done: // Restore registers ldp x21, x22, [sp], #16 ldp x19, x20, [sp], #16 ldp x29, x30, [sp], #16 ret // Backtrace Function .global backtrace backtrace: stp x29, x30, [sp, #-16]! mov x29, sp // Save registers stp x19, x20, [sp, #-16]! // x0 = max frames mov x19, x0 // Start with current frame mov x20, x29 backtrace_loop: cmp x19, #0 b.le backtrace_done // Print frame address mov x0, x20 bl print_address // Print return address ldr x0, [x20, #8] bl print_address // Get previous frame ldr x20, [x20] // Check for null or invalid frame cbz x20, backtrace_done // Decrement counter sub x19, x19, #1 b backtrace_loop backtrace_done: // Restore registers ldp x19, x20, [sp], #16 ldp x29, x30, [sp], #16 ret .global ios_memory_protection ios_memory_protection: // Query memory region mov x0, x0 // Address to query adrp x1, mem_info add x1, x1, :lo12:mem_info // Call system function to query memory info mov x16, #0 // Memory info syscall number svc #0x80 // iOS syscall // Check protection flags ldr w0, [x1, #16] // Protection flags offset tst w0, #1 // Test read permission cset w2, ne tst w0, #2 // Test write permission cset w3, ne tst w0, #4 // Test execute permission cset w4, ne ret .global android_memory_protection android_memory_protection: // Save link register str x30, [sp, #-16]! // Open /proc/self/maps adrp x0, proc_maps_path add x0, x0, :lo12:proc_maps_path mov x1, #0 // O_RDONLY mov x8, #56 // openat syscall mov x2, #0 mov x3, #0 svc #0 // Check for error cmn x0, #4095 b.hi open_error // Parse the maps file mov x19, x0 // Save file descriptor adrp x1, maps_buffer add x1, x1, :lo12:maps_buffer mov x2, #4096 // Buffer size mov x8, #63 // read syscall svc #0 // Close the file mov x0, x19 mov x8, #57 // close syscall svc #0 // Find our target address in the maps // ... (parsing logic) ldr x30, [sp], #16 ret open_error: // Handle error mov x0, #-1 ldr x30, [sp], #16 ret