[Mono][RISC-V] emit mul inst instead of emulated mul

[Xinlong-Wu]

• emit mul inst instead of emulated mul
• try handle exceptions
• emit inst idiv
• process ArgOnStack arg at prologue
• fix logic emit_imm

[Xinlong-Wu]

btw, what should I do if I want to set up a CI for RISC-V Arch?

[am11]

btw, what should I do if I want to set up a CI for RISC-V Arch?

Wait for #85443 😉

[am11]

@Xinlong-Wu, with this PR, helloworld app works using dotnet (tested #84470 (comment)). 👍

I then tested this sample: https://github.com/dotnet/samples/tree/7b5da1b14bb3efc24d97e104ddbe5d3bb88f8cbc/csharp/getting-started/console-webapiclient, it throws from lowering:

$ /artifacts/bin/testhost/net8.0-linux-Debug-riscv64/dotnet bin/Release/net8.0/console-webapiclient.dll

unable to lowering following IR: long_mul_imm R45 <- R42
* Assertion: should not be reached at /runtime/src/mono/mono/mini/mini-riscv.c:2709

(aside: maybe reword unable to lowering following IR message as unable to lower the following IR)

[Xinlong-Wu]

@Xinlong-Wu, with this PR, helloworld app works using dotnet (tested #84470 (comment)). 👍

I then tested this sample: https://github.com/dotnet/samples/tree/7b5da1b14bb3efc24d97e104ddbe5d3bb88f8cbc/csharp/getting-started/console-webapiclient, it throws from lowering:

$ /artifacts/bin/testhost/net8.0-linux-Debug-riscv64/dotnet bin/Release/net8.0/console-webapiclient.dll

unable to lowering following IR: long_mul_imm R45 <- R42
* Assertion: should not be reached at /runtime/src/mono/mono/mini/mini-riscv.c:2709

(aside: maybe reword unable to lowering following IR message as unable to lower the following IR)

yeah, cuz the port of Mono was not been completed. I think the IR long_mul_imm will be lowered in next pr

[Xinlong-Wu]

ping, can this pr been merged?