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[deliverable/binutils-gdb.git] / gas / doc / c-i860.texi

diff --git a/gas/doc/c-i860.texi b/gas/doc/c-i860.texi
index de01308bc84bb6b4d5b529ffe5114ace4e4ec876..22f13778f064493f80671c5be3b4c90ccb515901 100644 (file)
--- a/gas/doc/c-i860.texi
+++ b/gas/doc/c-i860.texi
@@ -1,4 +1,4 @@
-@c Copyright 2000 Free Software Foundation, Inc.
+@c Copyright 2000, 2003 Free Software Foundation, Inc.
 @c This is part of the GAS manual.
 @c For copying conditions, see the file as.texinfo.
 @ifset GENERIC
@@ -13,10 +13,7 @@
 
 @ignore
 @c FIXME: This is basically a stub for i860. There is tons more information
-that I will add later (jle@cygnus.com). The assembler is still being
-written. The i860 assembler that existed previously was never finished
-and doesn't even build. Further, its not BFD_ASSEMBLER and it doesn't
-do ELF (it doesn't do anything, but you get the point).
+that I will add later (jle@cygnus.com).
 @end ignore
 
 @cindex i860 support
@@ -36,6 +33,13 @@ support SVR4 PIC (i.e., @code{@@GOT, @@GOTOFF, @@PLT}).
 Like the SVR4/860 assembler, the output object format is ELF32. Currently,
 this is the only supported object format. If there is sufficient interest,
 other formats such as COFF may be implemented.
+
+Both the Intel and AT&T/SVR4 syntaxes are supported, with the latter
+being the default.  One difference is that AT&T syntax requires the '%'
+prefix on register names while Intel syntax does not.  Another difference
+is in the specification of relocatable expressions.  The Intel syntax
+is @code{ha%expression} whereas the SVR4 syntax is @code{[expression]@@ha}
+(and similarly for the "l" and "h" selectors).
 @node Options-i860
 @section i860 Command-line Options
 @subsection SVR4 compatibility options 
@@ -62,6 +66,13 @@ will be expanded into two instructions. This is a very undesirable feature to
 rely on, so this flag can help detect any code where it happens. One
 use of it, for instance, has been to find and eliminate any place
 where @code{gcc} may emit these pseudo-instructions.
+@item -mxp
+Enable support for the i860XP instructions and control registers.  By default,
+this option is disabled so that only the base instruction set (i.e., i860XR)
+is supported.
+@item -mintel-syntax
+The i860 assembler defaults to AT&T/SVR4 syntax.  This option enables the
+Intel syntax.
 @end table
 
 @node Directives-i860
@@ -93,12 +104,20 @@ Change the temporary register used when expanding pseudo operations. The
 default register is @code{r31}.
 @end table
 
+The @code{.dual}, @code{.enddual}, and @code{.atmp} directives are available only in the Intel syntax mode.
+
+Both syntaxes allow for the standard @code{.align} directive.  However,
+the Intel syntax additionally allows keywords for the alignment
+parameter: "@code{.align type}", where `type' is one of @code{.short}, @code{.long},
+@code{.quad}, @code{.single}, @code{.double} representing alignments of 2, 4,
+16, 4, and 8, respectively.
+
 @node Opcodes for i860
 @section i860 Opcodes
 
 @cindex opcodes, i860
 @cindex i860 opcodes
-All of the Intel i860 machine instructions are supported. Please see
+All of the Intel i860XR and i860XP machine instructions are supported. Please see
 either @emph{i860 Microprocessor Programmer's Reference Manual} or @emph{i860 Microprocessor Architecture} for more information.
 @subsection Other instruction support (pseudo-instructions)
 For compatibility with some other i860 assemblers, a number of
@@ -117,10 +136,10 @@ or large_imm@@l,%rn,%rn
 @end smallexample
 @item Load/store with relocatable address expression:
 
-For example, the pseudo-instruction @code{ld.b addr,%rn} 
+For example, the pseudo-instruction @code{ld.b addr_exp(%rx),%rn} 
 will be expanded into:
 @smallexample
-orh addr_exp@@ha,%r0,%r31
+orh addr_exp@@ha,%rx,%r31
 ld.l addr_exp@@l(%r31),%rn
 @end smallexample