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nviennot / stm32-emulator

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Handle implicit/missing SysTick peripheral in SVD #3

Open Ristovski opened 2 years ago

Ristovski commented 2 years ago

Some STM32 SVDs (like STM32L051x.svd) do not provide an explicit SysTick (STK) peripheral.

In Renode, these are handled implicitly inside their NVIC peripheral: https://github.com/renode/renode-infrastructure/blob/8da5a9d744a4b1048b3affb02a755161fdd477cc/src/Emulator/Cores/Arm-M/NVIC.cs#L723

This is why with Renode, one needs to set the address of NVIC to 0xE000E000 instead of 0xE000E100.

Currently, this causes the execution to stall:

[clk=01572483 pc=0x080049e6] TRACE read:  addr=0xe000e018 peri=???? read=0x00000000
[clk=01572560 pc=0x080049e6] TRACE read:  addr=0xe000e018 peri=???? read=0x00000000
[clk=01572637 pc=0x080049e6] TRACE read:  addr=0xe000e018 peri=???? read=0x00000000
[clk=01572714 pc=0x080049e6] TRACE read:  addr=0xe000e018 peri=???? read=0x00000000
[clk=01572791 pc=0x080049e6] TRACE read:  addr=0xe000e018 peri=???? read=0x00000000

Judging by the Renode NVIC implementation (SysTickValue = 0x18) it seems to be trying to read the SysTick value.

nviennot commented 2 years ago

It would be a good idea to add an arm.svd containing the arm cortex core register definitions

Can you prepare such SVD?