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| author | Jose E. Marchesi <jose.marchesi@oracle.com> | 2023-11-18 18:12:44 +0100 |
|---|---|---|
| committer | Jose E. Marchesi <jose.marchesi@oracle.com> | 2023-11-18 18:17:26 +0100 |
| commit | 8fbb497b7202f404d8914252d44d2ee190a0e172 (patch) | |
| tree | f66854caee10fdcb22186c67eedae3aebe24f1f5 /gas/doc | |
| parent | 26c7a0ea380bedb86ff3b5a9ed252d8d2557a0c5 (diff) | |
| download | binutils-8fbb497b7202f404d8914252d44d2ee190a0e172.zip binutils-8fbb497b7202f404d8914252d44d2ee190a0e172.tar.gz binutils-8fbb497b7202f404d8914252d44d2ee190a0e172.tar.bz2 | |
gas: bpf: do not allow referring to register names as symbols in operands
2023-11-18 Jose E. Marchesi <jemarch@gnu.org>
* config/tc-bpf.c (parse_bpf_register): Move before
bpf_parse_name.
(bpf_parse_name): Do not allow using symbols that are also
register names as operands in pseudo-c syntax.
* testsuite/gas/bpf/regs-for-symbols-pseudoc.d: New file.
* testsuite/gas/bpf/regs-for-symbols-pseudoc.s: Likewise.
* testsuite/gas/bpf/regs-for-symbols-pseudoc.l: Likewise.
* doc/c-bpf.texi (BPF Registers): Document that it is not possible
to refer to register names as symbols in instruction operands.
Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/c-bpf.texi | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gas/doc/c-bpf.texi b/gas/doc/c-bpf.texi index bdd9fde..25ae231 100644 --- a/gas/doc/c-bpf.texi +++ b/gas/doc/c-bpf.texi @@ -113,7 +113,12 @@ Read-only frame pointer register. @noindent Note that in the Pseudo-C syntax register names are not preceded by -@code{%} characters. +@code{%} characters. A consequence of that is that in contexts like +instruction operands, where both register names and expressions +involving symbols are expected, there is no way to disambiguate +between them. In order to keep things simple, this assembler does not +allow to refer to symbols whose names collide with register names in +instruction operands. @node BPF Directives @section BPF Directives |