[PATCH] ARC: Enable automatic support for newer ARC ISA variants (ARCv3)

[PATCH] ARC: Enable automatic support for newer ARC ISA variants (ARCv3)

[Vineet Gupta]

The syscall TRAP instruction used to be 4 bytes on legacy ARCompact
based ARC700 cores. Since then ARCv2 (circa 2014) and the upcoming ARCv3
use the same 2-byte TRAP_S instruction.

To ease porting of software to new ISA, special case ARC700.

This is the only change needed to get strace working on 64-bit ARCv3
cores (kudos to strace for making porting so easy)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
 src/linux/arc/raw_syscall.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/linux/arc/raw_syscall.h b/src/linux/arc/raw_syscall.h
index 6e60a6112b31..f54fe06f33df 100644
--- a/src/linux/arc/raw_syscall.h
+++ b/src/linux/arc/raw_syscall.h
@@ -21,10 +21,8 @@ raw_syscall_0(const kernel_ulong_t nr, kernel_ulong_t *err)
 
 # ifdef __A7__
 #  define ARC_TRAP_INSN "trap0"
-# elif defined __HS__
-#  define ARC_TRAP_INSN "trap_s 0 "
 # else
-#  error unrecognized arc
+#  define ARC_TRAP_INSN "trap_s 0 "
 # endif
 
 	__asm__ __volatile__(ARC_TRAP_INSN
-- 
2.25.1


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Re: [PATCH] ARC: Enable automatic support for newer ARC ISA variants (ARCv3)

[Dmitry V. Levin]

On Mon, Feb 22, 2021 at 06:37:54PM -0800, Vineet Gupta wrote:
> The syscall TRAP instruction used to be 4 bytes on legacy ARCompact
> based ARC700 cores. Since then ARCv2 (circa 2014) and the upcoming ARCv3
> use the same 2-byte TRAP_S instruction.
> 
> To ease porting of software to new ISA, special case ARC700.
> 
> This is the only change needed to get strace working on 64-bit ARCv3
> cores (kudos to strace for making porting so easy)
> 
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
> ---
>  src/linux/arc/raw_syscall.h | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/src/linux/arc/raw_syscall.h b/src/linux/arc/raw_syscall.h
> index 6e60a6112b31..f54fe06f33df 100644
> --- a/src/linux/arc/raw_syscall.h
> +++ b/src/linux/arc/raw_syscall.h
> @@ -21,10 +21,8 @@ raw_syscall_0(const kernel_ulong_t nr, kernel_ulong_t *err)
>  
>  # ifdef __A7__
>  #  define ARC_TRAP_INSN "trap0"
> -# elif defined __HS__
> -#  define ARC_TRAP_INSN "trap_s 0 "
>  # else
> -#  error unrecognized arc
> +#  define ARC_TRAP_INSN "trap_s 0 "
>  # endif
>  
>  	__asm__ __volatile__(ARC_TRAP_INSN

Applied, thanks.


-- 
ldv

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