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Loops forever waiting for UART Controller to be ready. Need to simula…
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…te UART Controller Ready.
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@lupyuen
lupyuen committed Feb 20, 2023
1 parent b842358 commit bbb6a29
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129 changes: 120 additions & 9 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -141,13 +141,36 @@ TODO: Emulate Memory Protection
TODO: What happens when we run [Apache NuttX RTOS for PinePhone](nuttx) in Unicorn Emulator?

```rust
// Arm64 Memory Address where emulation starts
const ADDRESS: u64 = 0x40080000;

// Arm64 Machine Code for the above address
let arm64_code = include_bytes!("../nuttx/nuttx.bin");
// Arm64 Memory Address where emulation starts
const ADDRESS: u64 = 0x40080000;

// Arm64 Machine Code for the above address
let arm64_code = include_bytes!("../nuttx/nuttx.bin");

// Initialize emulator in Arm64 mode
let mut unicorn = Unicorn::new(
Arch::ARM64,
Mode::LITTLE_ENDIAN
).expect("failed to initialize Unicorn instance");
let emu = &mut unicorn;

// Map 2 MB memory at the above address for Arm64 Machine Code
emu.mem_map(
ADDRESS, // Address
2 * 1024 * 1024, // Size
Permission::ALL // Read, Write and Execute Access
).expect("failed to map code page");

// Map 16 MB at 0x01000000 for Memory-Mapped I/O by Allwinner A64 Peripherals
emu.mem_map(
0x01000000, // Address
16 * 1024 * 1024, // Size
Permission::READ | Permission::WRITE // Read and Write Access
).expect("failed to map memory mapped I/O");
```

[(Source)](https://github.com/lupyuen/pinephone-emulator/blob/main/src/main.rs#L6-L31)

Here's the output...

```text
Expand Down Expand Up @@ -210,8 +233,96 @@ hook_block: address=0x400801f0, size=16
hook_code: address=0x400801f0, size=4
hook_memory: address=0x40080208, size=8, mem_type=READ, value=0x0
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ_UNMAPPED, value=0x0
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `Ok(29523968)`,
right: `Ok(120)`', src/main.rs:74:5
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
hook_code: address=0x400801f8, size=4
hook_code: address=0x400801fc, size=4
hook_block: address=0x400801f4, size=12
hook_code: address=0x400801f4, size=4
hook_memory: address=0x01c28014, size=2, mem_type=READ, value=0x0
```

TODO: Loops forever waiting for UART Controller to be ready. Need to simulate UART Controller Ready.

```text
SECTION_FUNC(text, up_lowputc)
ldr x15, =UART0_BASE_ADDRESS
400801f0: 580000cf ldr x15, 40080208 <up_lowputc+0x18>
/private/tmp/nuttx/nuttx/arch/arm64/src/chip/a64_lowputc.S:89
early_uart_ready x15, w2
400801f4: 794029e2 ldrh w2, [x15, #20]
400801f8: 721b005f tst w2, #0x20
400801fc: 54ffffc0 b.eq 400801f4 <up_lowputc+0x4> // b.none
/private/tmp/nuttx/nuttx/arch/arm64/src/chip/a64_lowputc.S:90
early_uart_transmit x15, w0
40080200: 390001e0 strb w0, [x15]
/private/tmp/nuttx/nuttx/arch/arm64/src/chip/a64_lowputc.S:91
ret
40080204: d65f03c0 ret
```

[(Source)](nuttx/nuttx.S)
11 changes: 9 additions & 2 deletions src/main.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -16,13 +16,20 @@ fn main() {
).expect("failed to initialize Unicorn instance");
let emu = &mut unicorn;

// Map 2MB memory for this emulation
// Map 2 MB memory at the above address for Arm64 Machine Code
emu.mem_map(
ADDRESS, // Address
2 * 1024 * 1024, // Size
Permission::ALL // Permissions
Permission::ALL // Read, Write and Execute Access
).expect("failed to map code page");

// Map 16 MB at 0x01000000 for Memory-Mapped I/O by Allwinner A64 Peripherals
emu.mem_map(
0x01000000, // Address
16 * 1024 * 1024, // Size
Permission::READ | Permission::WRITE // Read and Write Access
).expect("failed to map memory mapped I/O");

// Write machine code to emulated memory
emu.mem_write(
ADDRESS,
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