Re: [Libunwind-devel] [PATCH] arm: fix reading SP register read

[MyungJoo Ham]

>   
>  Partially reverting 0f9937485 while keeping
> the part that disallowing writing to SP.
> 
> Signed-off-by: MyungJoo Ham <address@hidden>

CC: David Mosberger
CC: Ben Pye
CC: Geunsik Lim

This is related with stack unwinding issues @ 
https://github.com/dotnet/coreclr/issues/3309

> ---
>  src/arm/Gregs.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/src/arm/Gregs.c b/src/arm/Gregs.c
> index 688771f..0cc5552 100644
> --- a/src/arm/Gregs.c
> +++ b/src/arm/Gregs.c
> @@ -51,6 +51,10 @@ tdep_access_reg (struct cursor *c, unw_regnum_t reg, 
> unw_word_t *valp,
>        break;
>  
>      case UNW_ARM_R13:
> +      if (write)
> +        return -UNW_EREADONLYREG;
> +      loc = c->dwarf.loc[reg - UNW_ARM_R0];
> +      break;
>      case UNW_ARM_CFA:
>        if (write)
>          return -UNW_EREADONLYREG;
> -- 
> 1.9.1