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Add a generic .bss directive for ELF based targets.

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PR 3136
	* config/obj-elf.c (elf_pseudo_table): Add entry for .bss.
	(obj_elf_bss): New function.  Change to the .bss section.
	Support an optional subsection number.
	(obj_elf_change_section): Call obj_elf_section_change_hook.
	(obj_elf_section): Likewise.
	(obj_elf_data): Likewise.
	(obj_elf_text): Likewise.
	(obj_elf_struct): Likewise.
	(obj_elf_subsection): Likewise.
	(obj_elf_previous): Likewise.
	* config/obj-elf.h (obj_elf_bss): Prototype.
	* doc/as.texi (Bss): New node.
This commit is contained in:
Nick Clifton
2021-05-07 17:07:41 +01:00
parent 8a82de5884
commit 476654beae
4 changed files with 65 additions and 14 deletions
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49
gas/config/obj-elf.c
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@@ -131,6 +131,7 @@ static const pseudo_typeS elf_pseudo_table[] =
{"offset", obj_elf_struct, 0},
{"struct", obj_elf_struct, 0},
{"text", obj_elf_text, 0},
{"bss", obj_elf_bss, 0},
{"tls_common", obj_elf_tls_common, 0},
@@ -603,8 +604,8 @@ obj_elf_change_section (const char *name,
elt->prev_subseg = previous_subsection;
section_stack = elt;
}
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
old_sec = bfd_get_section_by_name_if (stdoutput, name, get_section_by_match,
(void *) match_p);
@@ -1125,8 +1126,7 @@ obj_elf_section (int push)
md_flush_pending_output ();
#endif
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
s_mri_sect (&mri_type);
@@ -1467,6 +1467,28 @@ obj_elf_section (int push)
subseg_set (now_seg, new_subsection);
}
/* Change to the .bss section. */
void
obj_elf_bss (int i ATTRIBUTE_UNUSED)
{
int temp;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
obj_elf_section_change_hook ();
temp = get_absolute_expression ();
subseg_set (bss_section, (subsegT) temp);
demand_empty_rest_of_line ();
#ifdef md_elf_section_change_hook
md_elf_section_change_hook ();
#endif
}
/* Change to the .data section. */
void
@@ -1476,8 +1498,8 @@ obj_elf_data (int i)
md_flush_pending_output ();
#endif
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
s_data (i);
#ifdef md_elf_section_change_hook
@@ -1494,8 +1516,8 @@ obj_elf_text (int i)
md_flush_pending_output ();
#endif
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
s_text (i);
#ifdef md_elf_section_change_hook
@@ -1512,8 +1534,8 @@ obj_elf_struct (int i)
md_flush_pending_output ();
#endif
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
s_struct (i);
#ifdef md_elf_section_change_hook
@@ -1530,8 +1552,7 @@ obj_elf_subsection (int ignore ATTRIBUTE_UNUSED)
md_flush_pending_output ();
#endif
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
temp = get_absolute_expression ();
subseg_set (now_seg, (subsegT) temp);
@@ -1570,8 +1591,8 @@ obj_elf_previous (int ignore ATTRIBUTE_UNUSED)
new_section = previous_section;
new_subsection = previous_subsection;
previous_section = now_seg;
previous_subsection = now_subseg;
obj_elf_section_change_hook ();
subseg_set (new_section, new_subsection);
#ifdef md_elf_section_change_hook