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Lee Lup Yuen 2023-07-19 10:46:50 +08:00
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README.md
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@ -2348,73 +2348,6 @@ We'll find out in a while...
[See the QEMU Kernel Mode Build Log](https://gist.github.com/lupyuen/dce0cdbbf4a4bdf9c79e617b3fe1b679)
```text
nx_start_application: Starting init task: /system/bin/init
load_absmodule: Loading /system/bin/init
elf_loadbinary: Loading file: /system/bin/init
elf_init: filename: /system/bin/init loadinfo: 0x802069e8
hostfs_open: relpath=bin/init, oflags=0x1, mode=0x1b6
...
NuttShell (NSH) NuttX-12.2.1-RC0
nsh> nx_start: CPU0: Beginning Idle Loop
nsh>
nsh> uname -a
posix_spawn: pid=0xc0202978 path=uname file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/uname
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'uname': -2
nxposix_spawn_exec: ERROR: exec failed: 2
NuttX 12.2.1-RC0 cafbbb1 Jul 15 2023 16:55:00 risc-v rv-virt
nsh>
nsh> ls /
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
/:
dev/
proc/
system/
nsh>
nsh> ls /system
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system
nsh>
nsh> ls /system/bin
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=bin
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system/bin
nsh>
nsh> ls /system/bin/init
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=bin/init
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system/bin/init
```
# Initialise RISC-V Supervisor Mode
Read the article...
@ -2602,7 +2535,7 @@ But NuttX crashes. Let's find out why...
TODO
`mcause` is 3, "Machine Software Interrupt".
From the Crash Dump above, `mcause` is 3, "Machine Software Interrupt".
Exception Program Counter `0x4020` `0434` is in RISC-V Semihosting `smh_call`...
@ -2630,7 +2563,7 @@ smh_call:
40200440: 0000 unimp
```
TODO: Who calls `smh_call`?
When we log `smh_call`...
```text
host_call: nbr=0x1, parm=0x40406778, size=24
@ -2638,7 +2571,17 @@ host_call: nbr=0x1, parm=0x40406778, size=24
[host_call](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64a/arch/risc-v/src/common/riscv_hostfs.c#L35-L73) says that the Semihosting Call is for HOST_OPEN. (Open a file)
When we disable Semihosting...
So NuttX crashes on Star64 because it's trying to read `/system/bin/init` via Semihosting!
(See next section)
Let's disable Semihosting and replace by Initial RAM Disk and ROMFS.
See https://github.com/apache/nuttx/issues/9501
And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
Here's the Crash Dump after we disabled Semihosting...
```text
123067DFHBCqemu_rv_kernel_mappings: map I/O regions
@ -2724,11 +2667,11 @@ dump_task: 0 0 0 FIFO Kthread N-- Running 00000000000
dump_task: 1 1 100 RR Kthread --- Waiting Unlock 0000000000000000 0x4040a060 1952 264 13.5% lpwork 0x404013e0
```
TODO: See https://github.com/apache/nuttx/issues/9501
# NuttX System Filesystem
TODO: Where is `/system/bin/init`?
TODO
Where is `/system/bin/init`?
```text
→ grep INIT .config
@ -2756,6 +2699,83 @@ That's how `/system/bin/init` gets loaded over Semihosting...
getprime hello init sh
```
We traced the Semihosting Calls in QEMU Kernel Mode, here's what we observed...
[QEMU Kernel Mode Run Log](https://gist.github.com/lupyuen/6888376da6561bdc060c2459dffdef01)
```text
nx_start_application: Starting init task: /system/bin/init
load_absmodule: Loading /system/bin/init
elf_loadbinary: Loading file: /system/bin/init
elf_init: filename: /system/bin/init loadinfo: 0x802069e8
hostfs_open: relpath=bin/init, oflags=0x1, mode=0x1b6
...
NuttShell (NSH) NuttX-12.2.1-RC0
nsh> nx_start: CPU0: Beginning Idle Loop
nsh>
nsh> uname -a
posix_spawn: pid=0xc0202978 path=uname file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/uname
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'uname': -2
nxposix_spawn_exec: ERROR: exec failed: 2
NuttX 12.2.1-RC0 cafbbb1 Jul 15 2023 16:55:00 risc-v rv-virt
nsh>
nsh> ls /
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
/:
dev/
proc/
system/
nsh>
nsh> ls /system
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system
nsh>
nsh> ls /system/bin
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=bin
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system/bin
nsh>
nsh> ls /system/bin/init
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
hostfs_stat: relpath=bin/ls
host_call: nbr=0x1, parm=0x80208fe0, size=24
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
hostfs_stat: relpath=bin/init
host_call: nbr=0x1, parm=0x80209180, size=24
host_call: nbr=0xc, parm=0x80209180, size=8
host_call: nbr=0x2, parm=0x80209190, size=8
/system/bin/init
```
We need to replicate this with Initial RAM Disk and ROMFS.
See https://github.com/apache/nuttx/issues/9501
And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
# TODO
TODO: up_mtimer_initialize