[PATCH] RISC-V: Fix the merged orders of Z* extension for linker.

[Nelson Chu]

Committed, thanks.

Nelson

On Mon, Jan 4, 2021 at 11:12 AM Nelson Chu <nelson.chu@sifive.com> wrote:
>
> Similar to the commit 6729e2c2af2bd94408430734316597843718a484,
> we have to check the first char of the Z* extensions, to make
> sure that they follow the order of the standard extensions.
>
> bfd/
>     * elfxx-riscv.c (riscv_compare_subsets): Removed static.
>     * elfxx-riscv.h: Add declaration.
>     * elfnn-riscv.c (riscv_merge_multi_letter_ext): Use
>     riscv_compare_subsets to check the orders.
>     (riscv_skip_prefix): Removed.
>     (riscv_prefix_cmp): Removed.
> ---
>  bfd/elfnn-riscv.c | 35 +----------------------------------
>  bfd/elfxx-riscv.c |  2 +-
>  bfd/elfxx-riscv.h |  3 +++
>  3 files changed, 5 insertions(+), 35 deletions(-)
>
> diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
> index dff0d4d..047f31b 100644
> --- a/bfd/elfnn-riscv.c
> +++ b/bfd/elfnn-riscv.c
> @@ -3410,39 +3410,6 @@ riscv_merge_std_ext (bfd *ibfd,
>    return TRUE;
>  }
>
> -/* If C is a prefix class, then return the EXT string without the prefix.
> -   Otherwise return the entire EXT string.  */
> -
> -static const char *
> -riscv_skip_prefix (const char *ext, riscv_isa_ext_class_t c)
> -{
> -  switch (c)
> -    {
> -    case RV_ISA_CLASS_X: return &ext[1];
> -    case RV_ISA_CLASS_S: return &ext[1];
> -    case RV_ISA_CLASS_Z: return &ext[1];
> -    default: return ext;
> -    }
> -}
> -
> -/* Compare prefixed extension names canonically.  */
> -
> -static int
> -riscv_prefix_cmp (const char *a, const char *b)
> -{
> -  riscv_isa_ext_class_t ca = riscv_get_prefix_class (a);
> -  riscv_isa_ext_class_t cb = riscv_get_prefix_class (b);
> -
> -  /* Extension name without prefix  */
> -  const char *anp = riscv_skip_prefix (a, ca);
> -  const char *bnp = riscv_skip_prefix (b, cb);
> -
> -  if (ca == cb)
> -    return strcasecmp (anp, bnp);
> -
> -  return (int)ca - (int)cb;
> -}
> -
>  /* Merge multi letter extensions.  PIN is a pointer to the head of the input
>     object subset list.  Likewise for POUT and the output object.  Return TRUE
>     on success and FALSE when a conflict is found.  */
> @@ -3460,7 +3427,7 @@ riscv_merge_multi_letter_ext (bfd *ibfd,
>
>    while (in && out)
>      {
> -      cmp = riscv_prefix_cmp (in->name, out->name);
> +      cmp = riscv_compare_subsets (in->name, out->name);
>
>        if (cmp < 0)
>         {
> diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
> index 101e27f..d3b6472 100644
> --- a/bfd/elfxx-riscv.c
> +++ b/bfd/elfxx-riscv.c
> @@ -1037,7 +1037,7 @@ static int riscv_ext_order[26] = {0};
>     or greater than zero if `subset2` is found, respectively, to be less
>     than, to match, or be greater than `subset1`.  */
>
> -static int
> +int
>  riscv_compare_subsets (const char *subset1, const char *subset2)
>  {
>    int order1 = riscv_ext_order[(*subset1 - 'a')];
> diff --git a/bfd/elfxx-riscv.h b/bfd/elfxx-riscv.h
> index 3a7c7b7..4d7a6dc 100644
> --- a/bfd/elfxx-riscv.h
> +++ b/bfd/elfxx-riscv.h
> @@ -116,3 +116,6 @@ riscv_get_priv_spec_class_from_numbers (unsigned int,
>
>  extern const char *
>  riscv_get_priv_spec_name (enum riscv_priv_spec_class);
> +
> +extern int
> +riscv_compare_subsets (const char *, const char *);
> --
> 2.7.4
>