I saw that there is a define TC_PARSE_CONS_EXPRESSION that can be used to
install a hook. I just wanted to make sure I was not missing something simpler.
-Original Message-
From: Adhemerval Zanella Netto
Sent: Thursday, June 22, 2023 3:36 PM
To: zac.wal...@linaro.org; linaro-toolchain@lists.linaro.org
Subject: Re: Need emit_expr to write right shifted value.
On 22/06/23 10:18, zac.wal...@linaro.org wrote:
> Hi,
>
> In binutils I need to write an offset between two symbols shifted right by 2
> bits. This offset is written to the xdata section. My
> code currently looks like this:
>
> exp.X_op = O_subtract;
> exp.X_add_symbol = symbol1;
> exp.X_op_symbol = symbol2;
>emit_expr (&exp, 2);
>
> This works fine but obviously the result value is not shifted. Anyone have a
> good option is to shift the output of emit_expr at
> write time?
>
> I cannot use resolve_expression because the symbols do not have correct
> addresses at the time this code executes.
The 'struct expressionS' has the additional 'X_md' which is used by some targets
to add extra rules for the expression. I am not very knowledge on this code,
but I would expect that ld has a callback to handle the expressions prior the
written.
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