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authorNick Clifton <nickc@redhat.com>2008-09-03 14:02:30 +0000
committerNick Clifton <nickc@redhat.com>2008-09-03 14:02:30 +0000
commita6c24e68b9c0bde0587b9fbf2a50aa09c58c207c (patch)
tree6532bfb765766c2b7fa3e647ac4c1fda0c604ae4 /gas
parent514f746bdc40681c8a32ef8077adeae4f2098db2 (diff)
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* config/tc-i386.c (pe_lcomm_internal): New function. Allows the
alignment field of the .lcomm directive to be optional. (pe_lcomm): New function. Pass pe_lcomm_internal to s_comm_internal. (md_pseudo_table): Implement .lcomm directive for COFF based targets. * doc/c-i386.texi (i386-Directives): New node. Used to document the .lcomm directive.
Diffstat (limited to 'gas')
-rw-r--r--gas/ChangeLog11
-rw-r--r--gas/config/tc-i386.c44
-rw-r--r--gas/doc/c-i386.texi26
3 files changed, 81 insertions, 0 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog
index eb7b93b..fd0861a 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,14 @@
+2008-09-03 Nick Clifton <nickc@redhat.com>
+
+ * config/tc-i386.c (pe_lcomm_internal): New function. Allows the
+ alignment field of the .lcomm directive to be optional.
+ (pe_lcomm): New function. Pass pe_lcomm_internal to
+ s_comm_internal.
+ (md_pseudo_table): Implement .lcomm directive for COFF based
+ targets.
+ * doc/c-i386.texi (i386-Directives): New node. Used to document
+ the .lcomm directive.
+
2008-08-30 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
* config/tc-hppa.h: Don't define DWARF2_EH_FRAME_READ_ONLY on Linux
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 86ef49c..7744b16 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -684,6 +684,48 @@ static const arch_entry cpu_arch[] =
CPU_SSE5_FLAGS },
};
+/* Like s_lcomm_internal in gas/read.c but the alignment string
+ is allowed to be optional. */
+
+static symbolS *
+pe_lcomm_internal (int needs_align, symbolS *symbolP, addressT size)
+{
+ addressT align = 0;
+
+ SKIP_WHITESPACE ();
+
+ if (needs_align
+ && *input_line_pointer == ',')
+ {
+ align = parse_align (needs_align - 1);
+
+ if (align == (addressT) -1)
+ return NULL;
+ }
+ else
+ {
+ if (size >= 8)
+ align = 3;
+ else if (size >= 4)
+ align = 2;
+ else if (size >= 2)
+ align = 1;
+ else
+ align = 0;
+ }
+
+ bss_alloc (symbolP, size, align);
+ return symbolP;
+}
+
+void pe_lcomm (int);
+
+void
+pe_lcomm (int needs_align)
+{
+ s_comm_internal (needs_align * 2, pe_lcomm_internal);
+}
+
const pseudo_typeS md_pseudo_table[] =
{
#if !defined(OBJ_AOUT) && !defined(USE_ALIGN_PTWO)
@@ -694,6 +736,8 @@ const pseudo_typeS md_pseudo_table[] =
{"arch", set_cpu_arch, 0},
#ifndef I386COFF
{"bss", s_bss, 0},
+#else
+ {"lcomm", pe_lcomm, 1},
#endif
{"ffloat", float_cons, 'f'},
{"dfloat", float_cons, 'd'},
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
index 55cab7e..731bda2 100644
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -23,6 +23,7 @@ extending the Intel architecture to 64-bits.
@menu
* i386-Options:: Options
+* i386-Directives:: X86 specific directives
* i386-Syntax:: AT&T Syntax versus Intel Syntax
* i386-Mnemonics:: Instruction Naming
* i386-Regs:: Register Naming
@@ -193,6 +194,31 @@ The @code{.att_syntax} and @code{.intel_syntax} directives will take precedent.
@end table
+@node i386-Directives
+@section x86 specific Directives
+
+@cindex machine directives, x86
+@cindex x86 machine directives
+@table @code
+
+@cindex @code{lcomm} directive, COFF
+@item .lcomm @var{symbol} , @var{length}[, @var{alignment}]
+Reserve @var{length} (an absolute expression) bytes for a local common
+denoted by @var{symbol}. The section and value of @var{symbol} are
+those of the new local common. The addresses are allocated in the bss
+section, so that at run-time the bytes start off zeroed. @var{Symbol}
+is not declared global (@pxref{Global,,@code{.global}}), so is normally
+not visible to @code{@value{LD}}. The optional third parameter,
+@var{alignment}, specifies the desired alignment of the symbol in the
+bss section.
+
+This directive is only available for COFF based x86 targets.
+
+@c FIXME: Document other x86 specific directives ? Eg: .code16gcc,
+@c .largecomm
+
+@end table
+
@node i386-Syntax
@section AT&T Syntax versus Intel Syntax