get registers by name

[Carolyn Sala]

Is there a function that takes the name of a register and returns the register? If I give "ymm0", it returns DR_REG_YMM0. The get_register_name() function can be used to get the name of a register, but I can't find a function that does the opposite.

Thanks.

[Carolyn Sala]

You can get the register names with this function:

https://github.com/DynamoRIO/dynamorio/blob/fda62ccc8e41babe8081464f80fcfb2510825629/core/ir/opnd_shared.c#L2402

The id of the reg names in the reg_names array variable

https://github.com/DynamoRIO/dynamorio/blob/fda62ccc8e41babe8081464f80fcfb2510825629/core/ir/opnd.h#L92

matches the id of that register in the enum (Register identifiers),

https://github.com/DynamoRIO/dynamorio/blob/fda62ccc8e41babe8081464f80fcfb2510825629/core/ir/opnd_api.h#L290

 so we can return reg_id_t as the index number of the reg name,

Each arch has its own encode.c file:

https://github.com/DynamoRIO/dynamorio/blob/fda62ccc8e41babe8081464f80fcfb2510825629/core/ir/x86/encode.c#L125

[Carolyn Sala]

how a drtool can access to reg_names ?

[Sahil Gupta]

Currently, we do not have such an API that can do string to enum conversions. May I better understand what is the use-case for this?

We would always be happy to accept a Pull Request for this.