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Scheme runs OK on Star64 yay!

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Lee Lup Yuen 2023-10-14 17:55:57 +08:00
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@ -8090,6 +8090,17 @@ MTVAL: 0000000000000030
Exception Program Counter is `c000f366`. We disregard the `c000` because NuttX maps the Scheme App into the RISC-V User Memory Space at `c0000000`. So actual Program Counter is `f366`
```bash
CONFIG_ARCH_DATA_NPAGES=128
CONFIG_ARCH_DATA_VBASE=0xC0100000
CONFIG_ARCH_HEAP_NPAGES=128
CONFIG_ARCH_HEAP_VBASE=0xC0200000
CONFIG_ARCH_TEXT_NPAGES=128
CONFIG_ARCH_TEXT_VBASE=0xC0000000
```
[(Source)](https://github.com/apache/nuttx/blob/master/boards/risc-v/jh7110/star64/configs/nsh/defconfig#L25-L39)
We look up `f366` in the disassembly...
```bash
@ -8332,15 +8343,15 @@ TODO: Why is Interrupt Stack full again?
TODO: Explore [Run Time Stack Checking](https://cwiki.apache.org/confluence/plugins/servlet/mobile?contentId=139629451#content/view/139629451)
Check the next section for the Stack Dump analysis...
Read on to find out what caused the App Stack to overflow...
# Analyse the Stack Dump for Scheme Interpreter
TODO: Enable "RTOS Features > Stack Backtrace" in menuconfig (SCHED_BACKTRACE)
_In the previous section, we saw the Scheme App crashing on NuttX QEMU..._
_In the previous section, we saw the Scheme App crashing on NuttX QEMU due to Stack Overflow..._
_What are the Function Calls leading to the crash?_
_But why? What are the Function Calls leading to the crash?_
Let's construct the Stack Backtrace. We search for other Code Addresses in the Stack Dump above...
@ -8373,6 +8384,8 @@ c000fc58
We match the above Code Addresses to the Scheme App Disassembly (from the previous section).
[(Remember to disregard the `c00` prefix because that's the RISC-V User Memory Space)](https://github.com/apache/nuttx/blob/master/boards/risc-v/jh7110/star64/configs/nsh/defconfig#L25-L39)
Note that these Code Addresses are the __Return Addresses__. So we look up the Previous Instruction that appears in the Scheme App Disassembly...
```text
@ -8497,7 +8510,9 @@ When we read the Function Calls from bottom to top...
(Scheme App tries to get the Symbol Token's Internal Name and crashes here)
TODO: Interpret the calls
_So why did the Scheme App crash with a Stack Overflow?_
TODO: Recursion
# TODO