50 lines
1.7 KiB
Lua
50 lines
1.7 KiB
Lua
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--[[
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Creative ZEN hacking
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required argument (in order):
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- path to firmware
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- path to output firmware
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- path to blob
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- path to stub
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]]--
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if #arg < 4 then
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error("not enough argument to fuzep patcher")
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end
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local fw = hwp.load_file(arg[1])
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local irq_addr_pool = hwp.make_addr(0x38)
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local proxy_addr = arm.to_arm(hwp.make_addr(0x402519A0))
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-- read old IRQ address pool
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local old_irq_addr = hwp.make_addr(hwp.read32(fw, irq_addr_pool))
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print(string.format("Old IRQ address: %s", old_irq_addr))
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-- put stub at the beginning of the proxy
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local stub = hwp.load_bin_file(arg[4])
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local stub_info = hwp.section_info(stub, "")
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local stub_data = hwp.read(stub, hwp.make_addr(stub_info.addr, ""), stub_info.size)
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hwp.write(fw, proxy_addr, stub_data)
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local stub_addr = proxy_addr
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proxy_addr = hwp.inc_addr(proxy_addr, stub_info.size)
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-- modify irq
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hwp.write32(fw, irq_addr_pool, proxy_addr.addr)
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print(string.format("New IRQ address: %s", proxy_addr))
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-- in proxy, save registers
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arm.write_save_regs(fw, proxy_addr)
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proxy_addr = hwp.inc_addr(proxy_addr, 4)
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-- load blob
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local blob = hwp.load_bin_file(arg[3])
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local blob_info = hwp.section_info(blob, "")
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-- patch blob with stub address
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hwp.write32(blob, hwp.make_addr(blob_info.addr + 4, ""), stub_addr.addr)
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-- write it !
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local blob_data = hwp.read(blob, hwp.make_addr(blob_info.addr, ""), blob_info.size)
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hwp.write(fw, proxy_addr, blob_data)
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proxy_addr = hwp.inc_addr(proxy_addr, blob_info.size)
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-- restore registers
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arm.write_restore_regs(fw, proxy_addr)
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proxy_addr = hwp.inc_addr(proxy_addr, 4)
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-- branch to old code
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local branch_to_old = arm.make_branch(old_irq_addr, false)
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arm.write_branch(fw, proxy_addr, branch_to_old, hwp.inc_addr(proxy_addr, 4))
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-- save
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hwp.save_file(fw, arg[2])
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