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riscv-software-src / riscv-isa-sim

Spike, a RISC-V ISA Simulator
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Signature memory regions #1508

Open SyedHassanUlHaq opened 8 months ago

SyedHassanUlHaq commented 8 months ago

Are there any specific memory regions used for signature dump or does it depends on the test suites and the isa? If there is a specific memory region for a signature dump then what is it?

jerryz123 commented 8 months ago

The signature region is specified by special symbols in the ELF file.

https://github.com/riscv-software-src/riscv-isa-sim/blob/4841ad0238f0b71ca86fb28974765495cc0c34a9/fesvr/htif.cc#L164C1-L169C1

SyedHassanUlHaq commented 8 months ago

Thanks @jerryz123, But what if there's a test case in the disassembly such as: 

lui t5,0x413f3
addi t5,t5,-926
lui a7,0xe2fe6
addi a7,a7,1091
add zero,t5,a7
sw  zero,8(ra)
auipc ra,0x3
addi ra,ra,-564

here zero is being stored at address 0x00003030, the signature regions specified in the the disassembly also has this region specified but the refrence model signature file seems to have skipped this signature dump

The signature region is specified by special symbols in the ELF file.

https://github.com/riscv-software-src/riscv-isa-sim/blob/4841ad0238f0b71ca86fb28974765495cc0c34a9/fesvr/htif.cc#L164C1-L169C1