diff options
Diffstat (limited to 'gas/read.c')
| -rw-r--r-- | gas/read.c | 53 |
1 files changed, 53 insertions, 0 deletions
@@ -442,6 +442,7 @@ static const pseudo_typeS potable[] = { /* size */ {"space", s_space, 0}, {"skip", s_space, 0}, + {"nop", s_nop, 0}, {"sleb128", s_leb128, 1}, {"spc", s_ignore, 0}, {"stabd", s_stab, 'd'}, @@ -3508,6 +3509,58 @@ s_space (int mult) mri_comment_end (stop, stopc); } +void +s_nop (int ignore ATTRIBUTE_UNUSED) +{ + expressionS exp; + expressionS val; + +#ifdef md_flush_pending_output + md_flush_pending_output (); +#endif + +#ifdef md_cons_align + md_cons_align (1); +#endif + + expression (&exp); + + if (*input_line_pointer == ',') + { + ++input_line_pointer; + expression (&val); + } + else + { + val.X_op = O_constant; + val.X_add_number = 0; + } + + if (val.X_op == O_constant) + { + if (val.X_add_number < 0) + { + as_warn (_("negative nop control byte, ignored")); + val.X_add_number = 0; + } + + if (!need_pass_2) + { + /* Store the no-op instruction control byte in the first byte + of frag. */ + char *p; + symbolS *sym = make_expr_symbol (&exp); + p = frag_var (rs_space_nop, 1, 1, (relax_substateT) 0, + sym, (offsetT) 0, (char *) 0); + *p = val.X_add_number; + } + } + else + as_bad (_("unsupported variable nop control in .nop directive")); + + demand_empty_rest_of_line (); +} + /* This is like s_space, but the value is a floating point number with the given precision. This is for the MRI dcb.s pseudo-op and friends. */ |