gas: consistently emit diagnostics for non-zero data emission to .bss/.struct
This commit is contained in:
Jan Beulich
Jan Beulich
parent
35c1a43964
commit
ec9ab52c32
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@ -1,3 +1,16 @@
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2015-12-08 Jan Beulich <jbeulich@suse.com>
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* read.c (in_bss): New.
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(do_align): Use it to also warn for non-zero fill in .bss.
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(do_org): Likewise.
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(s_space): Likewise.
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(s_fill): Error on bad use in .bss/.struct.
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(float_cons): Likewise.
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(emit_leb128_expr): Likewise.
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(emit_expr_with_reloc): Defer handling use inside .struct. Also
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error on non-zero item added to .bss.
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(stringer_append_char): Error on non-zero character.
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2015-12-08 Jan Beulich <jbeulich@suse.com>
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* read.c (stringer): Move absolute section check up. Return
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104
gas/read.c
104
gas/read.c
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@ -1337,6 +1337,14 @@ convert_to_bignum (expressionS *exp, int sign)
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exp->X_add_number = i;
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}
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static bfd_boolean
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in_bss (void)
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{
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flagword flags = bfd_get_section_flags (stdoutput, now_seg);
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return (flags & SEC_ALLOC) && !(flags & (SEC_LOAD | SEC_HAS_CONTENTS));
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}
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/* For most MRI pseudo-ops, the line actually ends at the first
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nonquoted space. This function looks for that point, stuffs a null
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in, and sets *STOPCP to the character that used to be there, and
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@ -1402,13 +1410,17 @@ s_abort (int ignore ATTRIBUTE_UNUSED)
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static void
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do_align (int n, char *fill, int len, int max)
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{
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if (now_seg == absolute_section)
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if (now_seg == absolute_section || in_bss ())
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{
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if (fill != NULL)
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while (len-- > 0)
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if (*fill++ != '\0')
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{
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as_warn (_("ignoring fill value in absolute section"));
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if (now_seg == absolute_section)
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as_warn (_("ignoring fill value in absolute section"));
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else
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as_warn (_("ignoring fill value in section `%s'"),
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segment_name (now_seg));
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break;
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}
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fill = NULL;
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@ -2207,6 +2219,20 @@ s_fill (int ignore ATTRIBUTE_UNUSED)
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if (size && !need_pass_2)
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{
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if (now_seg == absolute_section)
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{
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if (rep_exp.X_op != O_constant)
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as_bad (_("non-constant fill count for absolute section"));
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else if (fill && rep_exp.X_add_number != 0)
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as_bad (_("attempt to fill absolute section with non-zero value"));
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abs_section_offset += rep_exp.X_add_number * size;
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}
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else if (fill
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&& (rep_exp.X_op != O_constant || rep_exp.X_add_number != 0)
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&& in_bss ())
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as_bad (_("attempt to fill section `%s' with non-zero value"),
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segment_name (now_seg));
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if (rep_exp.X_op == O_constant)
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{
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p = frag_var (rs_fill, (int) size, (int) size,
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@ -2777,6 +2803,10 @@ do_org (segT segment, expressionS *exp, int fill)
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symbolS *sym = exp->X_add_symbol;
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offsetT off = exp->X_add_number * OCTETS_PER_BYTE;
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if (fill && in_bss ())
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as_warn (_("ignoring fill value in section `%s'"),
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segment_name (now_seg));
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if (exp->X_op != O_constant && exp->X_op != O_symbol)
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{
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/* Handle complex expressions. */
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@ -3331,10 +3361,11 @@ s_space (int mult)
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val.X_add_number = 0;
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}
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if (val.X_op != O_constant
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|| val.X_add_number < - 0x80
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|| val.X_add_number > 0xff
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|| (mult != 0 && mult != 1 && val.X_add_number != 0))
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if ((val.X_op != O_constant
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|| val.X_add_number < - 0x80
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|| val.X_add_number > 0xff
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|| (mult != 0 && mult != 1 && val.X_add_number != 0))
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&& (now_seg != absolute_section && !in_bss ()))
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{
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resolve_expression (&exp);
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if (exp.X_op != O_constant)
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@ -3375,6 +3406,8 @@ s_space (int mult)
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/* If we are in the absolute section, just bump the offset. */
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if (now_seg == absolute_section)
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{
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if (val.X_op != O_constant || val.X_add_number != 0)
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as_warn (_("ignoring fill value in absolute section"));
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abs_section_offset += repeat;
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goto getout;
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}
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@ -3412,7 +3445,10 @@ s_space (int mult)
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make_expr_symbol (&exp), (offsetT) 0, (char *) 0);
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}
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if (p)
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if ((val.X_op != O_constant || val.X_add_number != 0) && in_bss ())
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as_warn (_("ignoring fill value in section `%s'"),
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segment_name (now_seg));
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else if (p)
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*p = val.X_add_number;
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}
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@ -4213,15 +4249,6 @@ emit_expr_with_reloc (expressionS *exp,
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op = exp->X_op;
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/* Allow `.word 0' in the absolute section. */
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if (now_seg == absolute_section)
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{
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if (op != O_constant || exp->X_add_number != 0)
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as_bad (_("attempt to store value in absolute section"));
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abs_section_offset += nbytes;
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return;
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}
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/* Handle a negative bignum. */
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if (op == O_uminus
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&& exp->X_add_number == 0
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@ -4271,6 +4298,20 @@ emit_expr_with_reloc (expressionS *exp,
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op = O_constant;
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}
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/* Allow `.word 0' in the absolute section. */
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if (now_seg == absolute_section)
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{
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if (op != O_constant || exp->X_add_number != 0)
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as_bad (_("attempt to store value in absolute section"));
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abs_section_offset += nbytes;
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return;
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}
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/* Allow `.word 0' in BSS style sections. */
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if ((op != O_constant || exp->X_add_number != 0) && in_bss ())
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as_bad (_("attempt to store non-zero value in section `%s'"),
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segment_name (now_seg));
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p = frag_more ((int) nbytes);
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if (reloc != TC_PARSE_CONS_RETURN_NONE)
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@ -4854,6 +4895,21 @@ float_cons (/* Clobbers input_line-pointer, checks end-of-line. */
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return;
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}
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if (now_seg == absolute_section)
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{
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as_bad (_("attempt to store float in absolute section"));
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ignore_rest_of_line ();
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return;
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}
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if (in_bss ())
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{
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as_bad (_("attempt to store float in section `%s'"),
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segment_name (now_seg));
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ignore_rest_of_line ();
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return;
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}
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#ifdef md_flush_pending_output
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md_flush_pending_output ();
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#endif
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@ -5186,6 +5242,18 @@ emit_leb128_expr (expressionS *exp, int sign)
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op = O_big;
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}
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if (now_seg == absolute_section)
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{
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if (op != O_constant || exp->X_add_number != 0)
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as_bad (_("attempt to store value in absolute section"));
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abs_section_offset++;
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return;
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}
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if ((op != O_constant || exp->X_add_number != 0) && in_bss ())
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as_bad (_("attempt to store non-zero value in section `%s'"),
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segment_name (now_seg));
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/* Let check_eh_frame know that data is being emitted. nbytes == -1 is
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a signal that this is leb128 data. It shouldn't optimize this away. */
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nbytes = (unsigned int) -1;
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@ -5255,6 +5323,10 @@ s_leb128 (int sign)
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static void
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stringer_append_char (int c, int bitsize)
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{
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if (c && in_bss ())
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as_bad (_("attempt to store non-empty string in section `%s'"),
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segment_name (now_seg));
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if (!target_big_endian)
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FRAG_APPEND_1_CHAR (c);
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@ -1,3 +1,9 @@
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2015-12-08 Jan Beulich <jbeulich@suse.com>
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* gas/elf/bad-bss.d, gas/elf/bad-bss.err: New.
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* gas/elf/bss.d, gas/elf/bss.s: New.
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* gas/elf/elf.exp: Run new tests.
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2015-12-08 Jan Beulich <jbeulich@suse.com>
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* gas/elf/file-2.s, gas/elf/file-2.d: New.
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@ -0,0 +1,4 @@
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#name: bad .bss / .struct data allocation directives
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#source: bss.s
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#error-output: bad-bss.err
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#target: i?86-*-* x86_64-*-* ia64-*-* arm-*-* aarch64-*-*
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@ -0,0 +1,63 @@
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.*bss\.s: Assembler messages:
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store float in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to fill section .\.bss. with non-zero value
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss.
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store float in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to fill section .\.bss\.local. with non-zero value
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.bss\.local.
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store float in section .\.private.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-empty string in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to fill section .\.private. with non-zero value
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Error: attempt to store non-zero value in section .\.private.
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Warning: zero assumed.*
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.*bss\.s:[1-9][0-9]*: Error: attempt to store value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to store value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to store value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to store float in absolute section
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to fill absolute section with non-zero value
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in absolute section
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.*bss\.s:[1-9][0-9]*: Warning: ignoring fill value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to store value in absolute section
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.*bss\.s:[1-9][0-9]*: Error: attempt to store value in absolute section
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@ -0,0 +1,24 @@
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#name: good .bss / .struct data allocation directives
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#as: --defsym okay=1
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#warning: Warning: zero assumed
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#readelf: -sSW
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#target: i?86-*-* x86_64-*-* ia64-*-* arm-*-* aarch64-*-*
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There are [1-9][0-9]* section headers, starting at offset 0x[0-9a-f]*:
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Section Headers:
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#...
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*\[ [1-9]\] *\.bss +NOBITS +0*0 +0[0-9a-f]* 0*(28|40) +0*0 +WA +0 +0 +32
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*\[ [1-9]\] *\.bss\.local +NOBITS +0*0 +0[0-9a-f]* 0*(28|40) +0*0 +WA +0 +0 +32
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*\[ [1-9]\] *\.private +NOBITS +0*0 +0[0-9a-f]* 0*(28|40) +0*0 +WA +0 +0 +32
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#...
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Symbol table '\.symtab' contains [1-9][0-9]* entries:
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#...
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*[0-9]*: 0*28 *0 NOTYPE *LOCAL *DEFAULT *[1-9] endof_bss
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#...
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*[0-9]*: 0*28 *0 NOTYPE *LOCAL *DEFAULT *[1-9] endof_bss_local
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#...
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*[0-9]*: 0*28 *0 NOTYPE *LOCAL *DEFAULT *[1-9] endof_private
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#...
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*[0-9]*: 0*27 *0 NOTYPE *LOCAL *DEFAULT *ABS endof_struct
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#pass
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@ -0,0 +1,56 @@
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.macro bss name
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.long 0
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.long ,
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.balign 32
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.ifnes "\name", "struct"
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.ascii ""
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.asciz ""
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.endif
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.fill 1, 1
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.org .+1
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.skip 1
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.sleb128
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.sleb128 0
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.uleb128
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.uleb128 0
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.ifndef okay
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.long 1
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.long .
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.long x
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.float 0.0
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.balign 32, -1
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.ifnes "\name", "struct"
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.ascii "0"
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.asciz "0"
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.endif
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.fill 1, 1, -1
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.org .+1, -1
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.skip 1, -1
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.sleb128 -1
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.uleb128 1
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.endif
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endof_\name:
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.endm
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.bss
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bss bss
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.section .bss.local, "aw"
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bss bss_local
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.section .private, "aw", %nobits
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bss private
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.struct
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bss struct
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@ -205,6 +205,8 @@ if { [is_elf_format] } then {
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run_dump_test "dwarf2-2"
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run_dump_test "dwarf2-3"
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run_dump_test "dwarf2-4"
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run_dump_test "bss"
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run_dump_test "bad-bss"
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run_dump_test "bad-section-flag"
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run_dump_test "bad-size"
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run_dump_test "bad-group"
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